CRH2512F24R9E04Z 2512 24.9R 2W Ever Ohms thick film resistor

Okay, I will provide you with a detailed introduction to the product characteristics, parameters, and applications of CRH2512F24R9E04Z thick film power up resistor. The main content is as follows:

Product features: Introduce the technical characteristics of this resistor from three aspects: structural technology, electrical performance, and reliability, including core advantages such as thick film technology, power design, and stability.
Product parameters: Detailed analysis of three major parameter indicators: electrical characteristics (resistance, accuracy, temperature coefficient, etc.), mechanical characteristics (size, material, etc.), and ordering information (packaging, delivery time, etc.).
Product Applications: Explain specific application scenarios and design points in four major fields: power management systems, consumer electronics/home appliances, industrial control/communication equipment, and automotive electronics.

Next, I will begin writing the main body of the report:

Comprehensive analysis of CRH2512F24R9E04Z thick film power up resistor

1. Detailed explanation of product features

CRH2512F24R9E04Z is a high-performance thick film power up chip resistor developed by EVEROHMS, which plays a key role in electronic circuit design. This resistor combines advanced material technology and structural design, making it outstanding in terms of power density, stability, and environmental adaptability, and becoming an important component of power management solutions in modern electronic devices.

1.1 Innovative structural design and precision manufacturing processes
Thick film process technology: This resistor uses screen printing technology to accurately coat a special resistor paste made of a mixture of glass powder and metal oxide on a 96% alumina ceramic substrate, and then forms a dense resistor film layer through high-temperature sintering. This process not only ensures the uniformity and stability of the resistor, but also achieves high power carrying capacity in a compact size by optimizing the film thickness and composition ratio.
Structural optimization: Compared to conventional thick film resistors, this product adopts a power up design and maximizes the use of the limited space in the 2512 package (6.4mm × 3.2mm) by improving the geometric structure of the resistor body and electrode layout. This enables it to achieve a rated power of 2W at the same size, with a power density of more than 1.5 times that of ordinary thick film resistors, providing greater power redundancy space for circuit design.
Surface treatment: The resistor is covered with a high-performance glass glaze protective layer on the outside, which not only provides excellent mechanical protection, but also has excellent moisture resistance and chemical corrosion resistance, ensuring long-term stable operation of the resistor in humid or polluted environments. At the same time, the coating color facilitates laser marking resistance identification, meeting the traceability requirements of automated production.

1.2 Excellent electrical performance
Resistance stability: The nominal resistance value is 24.9 Ω (marked as 24R9), with an accuracy of ± 1%, meeting the strict requirements of precision circuits for initial resistance values. After rigorous aging testing, the stability of the resistor's load life under rated conditions is better than ± 1%, and long-term use is not prone to resistance drift.
Temperature adaptability: The temperature coefficient is ± 100ppm/℃, and the resistance change rate does not exceed ± 1.55% within a wide working temperature range of 55 ℃ to+155 ℃. This feature enables it to adapt to diverse application scenarios ranging from extremely cold environments to high-temperature equipment interiors, especially suitable for power electronic devices with large temperature fluctuations.
Power processing capability: The rated power of 2W enables it to withstand high continuous operating currents. According to the formula P=I ² R, its maximum continuous operating current can reach 283mA (I=√ (2/24.9) ≈ 0.283A). It is worth mentioning that this resistor has excellent surge resistance and can withstand instantaneous overload surges up to 2.5 times the rated current (about 700mA), providing reliable protection in sudden overcurrent situations such as power on/off transients, lightning induction, or motor start-up.

1.3 High reliability and environmental certification
Environmental tolerance: The product has passed multiple rigorous environmental tests, including 85 ℃/85% RH high temperature and high humidity tests (1000 hours), temperature cycling (55 ℃ to+155 ℃, 1000 cycles), and welding thermal shock testing, ensuring stable performance in various harsh environments.
Environmental compliance: This resistor fully complies with the requirements of the EU RoHS Directive (2011/65/EU) and does not contain harmful substances such as lead, mercury, cadmium, etc; Simultaneously meeting REACH regulatory standards, free from substances of high concern (SVHC), and complying with modern green manufacturing requirements for electronic products.
Process compatibility: Using pure tin plated end electrodes, compatible with lead-free soldering process (peak temperature 260 ℃), high solder joint reliability. The end design optimizes the solder crawling height of the molten solder, ensuring a stable connection during reflow soldering and wave soldering processes, and reducing the risk of virtual soldering. It is recommended to use nitrogen protection technology during welding to reduce the risk of glass glaze microcracks that may occur in thick film resistors during wave soldering.

2. Comprehensive analysis of product parameters

The technical parameter system of CRH2512F24R9E04Z comprehensively covers electrical characteristics, mechanical characteristics, and ordering information, providing detailed data support for engineers' selection and circuit design.

2.1 Core electrical characteristic parameters
Basic parameter indicators: In terms of electrical performance, the standard resistance value of this resistor is 24.9 Ω (24R9), and the resistance accuracy is controlled within ± 1% (F level) range. The temperature coefficient (TCR) is ± 100ppm/℃, which is effective within the full operating temperature range of 55 ℃ to+155 ℃, ensuring stability in temperature changing environments. The rated power is 2W, but it should be noted that the testing environment temperature for this power is 70 ℃. When the ambient temperature exceeds 70 ℃, the power consumption should be reduced according to the derating curve of 12.5mW/℃.
Voltage endurance: The maximum operating voltage of this resistor reaches 200V, with a maximum overload voltage of 400V, allowing it to withstand voltage surges or induced electromotive force impacts during power startup. The insulation resistance exceeds 10G Ω, effectively preventing leakage current problems, especially suitable for high impedance circuit applications.
Other electrical characteristics: The typical value of the thermal resistance of the resistor is 75 ℃/W, which directly affects the heat dissipation design. Under the condition of no additional heat dissipation in a 25 ℃ environment, the temperature of the resistor will reach about 150 ℃ (ambient temperature+2W × 75 ℃/W) at full load, which is close to the upper limit of the operating temperature. Therefore, it is recommended to cooperate with PCB heat dissipation design in practical applications.

2.2 Mechanical structural parameters
Physical structure: The resistor adopts a standard 2512 package (metric code 6432), with specific dimensions of 6.4mm ± 0.2mm in length, 3.2mm ± 0.2mm in width, and 0.55mm ± 0.1mm in thickness. This size is considered a relatively large specification in surface mount resistors, ensuring sufficient power carrying capacity while also considering the adaptability of automated mounting processes.
Material composition: The substrate is made of 96% alumina ceramic, which has excellent thermal conductivity and mechanical strength. The resistor paste is made of ruthenate thick film material, ensuring stable resistance characteristics and low noise performance. The terminal electrode adopts a three-layer structure: the inner layer is made of silver palladium alloy to ensure ohmic contact with the resistor; The middle is a nickel barrier layer to prevent solder diffusion; The outer layer is coated with pure tin, providing excellent soldering performance.
Weight and packaging: The weight of a single resistor is about 35mg, and the standard packaging adopts a roll type with a roll diameter of 180mm and a width of 8mm. Each roll can hold 4000 pieces, which complies with the EIA481 standard and is suitable for high-speed automatic surface mount machines. The minimum order quantity (MOQ) is 4000 pieces, and the minimum packaging unit (SPQ) is also 4000 pieces per roll.

2.3 Ordering Information and Application Conditions
Naming convention for models: Each field in the model "CRH2512F24R9E04Z" has a clear meaning: "CRH" represents the Tian'er high-power thick film series; 2512 "represents the packaging size; 'F' indicates an accuracy of ± 1%; 24R9 "represents a resistance value of 24.9 Ω; E04 "represents temperature coefficient ± 100ppm/℃; Z "is the packaging code, indicating reel packaging.
Price and delivery time: This resistor adopts a tiered pricing strategy, where the larger the purchase quantity, the lower the unit price. For example, when purchasing 5 pieces, the unit price is about ¥ 1.96. When purchasing 1000 pieces, the unit price drops to ¥ 0.77, while when purchasing 10000 pieces in bulk, the unit price is only ¥ 0.42. The inventory status needs to be checked in real-time. When out of stock, the standard lead time is about 812 weeks, and in special circumstances, it can be shortened to 4 weeks.
Environmental requirements for use: The working temperature range is 55 ℃ to+155 ℃, and the storage temperature range is wider, from 55 ℃ to+175 ℃. The humidity sensitivity level (MSL) is level 1 and can be stored indefinitely at room temperature without the need for moisture-proof packaging.

Analysis of 3 Product Application Scenarios

CRH2512F24R9E04Z, with its 2W high power, ± 1% accuracy, and excellent temperature stability, has demonstrated wide applicability in many electronic fields, especially suitable for application scenarios that require balancing power processing capability and space constraints.

3.1 Power Management System
Power conversion circuit: In ACDC switching power supplies and DCDC converters, this resistor is often used in the primary side buffer circuit to effectively absorb voltage spikes generated when the switching transistor is turned off, protecting MOSFETs or IGBTs from breakdown damage. In a flyback topology, it can be connected in series with an RC network to form an RCD clamping circuit, and a 24.9 Ω resistance value combined with an appropriate capacitor can optimize energy absorption efficiency. In addition, the resistor serves as a current detection element in the output overcurrent protection circuit, achieving precise overload shutdown control by measuring the voltage drop across the resistor.
Battery management system: In the lithium battery protection board (BMS), this resistor is used in the battery balancing circuit to achieve cell voltage balance by controlling the discharge current. In typical applications, multiple resistors are connected in parallel to each cell and combined with MOSFET switches to form a passive balancing network. The 24.9 Ω resistance can limit the balancing current within a safe range (approximately 100150mA). In charger design, it is also used for input surge suppression circuits, working in conjunction with NTC thermistors to prevent current surges generated during insertion and removal from damaging rectifier devices.
Design points: Special attention should be paid to heat dissipation design in power applications. It is recommended to configure a copper foil heat dissipation area of no less than 100mm ² for resistors on the PCB (such as bottom copper plating), and connect the top and bottom copper foils through multiple thermal conductive vias to reduce thermal resistance by more than 40%. In high-temperature environments, derating should be considered, for example, the maximum power should not exceed 1.5W at an ambient temperature of 85 ℃.

3.2 Consumer Electronics and Home Appliances
Audio and video equipment: In the output stage of the audio amplifier, this resistor can be used as a compensating network element for the speaker. A 24.9 Ω resistor is connected in series with a capacitor to form a Zobel network, which cancels out the influence of the speaker voice coil inductance and prevents high-frequency self excitation. In AV receivers and home theater systems, it often appears on the power distribution bus as a small resistance buffer resistor to suppress crosstalk between subsystems.
Household appliances: In the compressor drive board of variable frequency air conditioners and refrigerators, this resistor is used for IGBT drive circuits, acting as a gate resistor (24.9 Ω) to optimize switching speed and suppress oscillations. In the resonant circuit of an induction cooker, it is connected in parallel with a capacitor to form a damping network, which absorbs the harmonic energy generated by LC oscillation. In addition, in the washing machine motor controller, it can also be used as a parallel current sharing resistor for low resistance sampling resistors in phase current detection.
Design points: Space optimization is key in the design of consumer products. Although the 2512 package has excellent power performance, it occupies a large PCB area (about 20.5mm ²). When laying out on high-density circuit boards, a 45 ° oblique placement can be used, or small-sized components (such as 0402 capacitors) can be arranged in the space above to maximize space utilization. At the same time, it is important to maintain a minimum distance of 5mm from heating elements such as inductors and power transistors to avoid thermal coupling effects.

3.3 Industrial Control and Communication Equipment
Industrial automation: In the PLC digital input module, this resistor is used for the voltage divider network of 24V industrial signal acquisition, reducing the field device signal to the acceptable range of ADC (such as 24V → 3.3V). In the servo drive current loop, multiple 24.9 Ω resistors are connected in parallel to form a high-power sampling array for real-time monitoring of motor phase current. In addition, in industrial sensor transmitters, it also serves as a zeroing resistor for the 420mA loop, accurately calibrating the output zero point.
Communication infrastructure: In the power module of 5G base stations, this resistor is used for the voltage feedback network of DCDC converters, ensuring output voltage stability with ± 1% accuracy and ± 100ppm temperature drift. In POE (Power over Ethernet) devices, it serves as a graded resistor at the PD end, meeting the requirements of the IEEE 802.3bt standard. In the optical module drive circuit of fiber optic equipment, it is also used for current limiting protection of laser diode bias.
Design points: Special attention should be paid to the impact of environmental stress in industrial environments. In sulfur-containing environments such as rubber factories and chemical plants, it is recommended to choose anti sulfurization models (such as the Tian'er TRL series) or apply three proof paint on the surface of the resistor. In high-frequency applications (such as communication power supplies), attention should be paid to the parasitic inductance of resistors (parasitic inductance of 2512 resistors is about 23nH), which may introduce additional impedance in the frequency band above GHz. In this case, metal film resistors or special low inductance resistors should be preferred.

3.4 Automotive Electronic Applications
Power and control system: In the engine control unit (ECU), this resistor is used for current limiting protection of sensor power supply, such as the 5V reference voltage circuit of throttle position sensor and oxygen sensor. In the on-board charger (OBC) of electric vehicles, it is used for the current detection network of PFC (power factor correction) circuit, with a 24.9 Ω resistance value combined with an operational amplifier to achieve high side current detection.
Body and Comfort System: In the LED headlight driver, this resistor is used in the constant current control circuit, which is matched with a linear steady current IC to set the precise output current. In the anti pinch control module of the electric window, it serves as a sampling resistor for motor current detection, and detects obstacles by monitoring current ripple. In addition, in the slave control unit of the battery management system, it is also used for the voltage divider network of high-voltage isolation detection.
Design points: Automotive applications must meet AECQ200 certification requirements. Although the resistor has not been explicitly certified by automotive regulations, its operating temperature range (55 ℃~155 ℃) and vibration resistance can meet most of the electronic requirements of the vehicle body. When applied in high-temperature areas such as engine compartments, it is recommended to cooperate with active cooling or add radiators, and strictly reduce power according to an ambient temperature of 125 ℃ (at this time, the maximum power should not exceed 0.8W).

The CRH2512F24R9E04Z thick film power up resistor achieves a 2W high power density in a 2512 standard package through material innovation and structural optimization, while maintaining high stability with ± 1% accuracy and ± 100ppm temperature drift. Its thick film process endows it with excellent surge resistance and environmental adaptability, coupled with reasonable heat dissipation design, which can be widely applied in key fields such as power management, industrial control, and automotive electronics. Engineers need to comprehensively consider the power derating curve, optimized heat dissipation layout, and environmental adaptability requirements when selecting, in order to fully leverage its performance advantages and improve the overall reliability of the system.