The selection requirements for resistors with 1206 packaging, 2.4 Ω resistance, 1W power, and ± 1% accuracy are as follows. Based on the technical differences and application scenarios of the six models (all made of metal film or alloy materials) you provided, we will provide selection recommendations. All models meet the core parameter requirements (1206 package/2.4 Ω/1W/1%), but targeted selection is required based on temperature coefficient, sulfur resistance, surge resistance, and cost.
2、 Recommended selection by scenario
1. Harsh environment (sulfur-containing, high temperature, or automotive electronics)
Recommended models: EAM16FT2R40DES, TSL120610F2R40P05Z
Reason:
Anti sulfide coating: prevents sulfide from corroding electrodes (such as industrial sulfur-containing gases, automobile exhaust) and extends their lifespan.
Temperature stability: EAM series TCR is as low as ± 100ppm/℃ (better than TSL's ± 200ppm/℃), with smaller resistance drift at high temperatures, suitable for engine control units (ECU), industrial sensors, etc.
2. High current/pulse scenarios (power supply, motor drive)
Recommended models: EGM16FT2R40DES, TRL120610F2R40P05Z
Reason:
Surge resistance: Supports short-term high current surges (such as the EGM series can withstand) 16W@0.01ms Pulse), suitable for current sampling resistors in switch mode power supply startup and motor controllers.
Heat dissipation optimization: Package design enhances heat dissipation (such as TRL series using thickened copper electrodes), reducing the risk of high-temperature failure.
3. Cost sensitive design (consumer electronics, home appliances)
Recommended models: ELR16FT2R40DES, TGL12061F2R40P05Z
Reason:
High cost-effectiveness: The TGL series is an economical option, and the unit price for bulk purchase can be as low as ¥ 0.01 per piece (referring to the market price of 1206 resistors).
Basic performance standard: TCR ± 200ppm/℃ meets conventional voltage division and current limiting requirements (such as LED drivers and power adapters).
3、 Selection precautions
Power derating:
When the ambient temperature is above 70 ℃, it is necessary to reduce the power consumption (such as reducing the power to 0.6W at 100 ℃) to avoid overheating and failure.
The recommended actual power consumption is ≤ 70% of the rated power (i.e. the actual power consumption of a 1W resistor is ≤ 0.7W).
Welding process:
The peak temperature of reflow soldering is ≤ 260 ℃. Excessive temperature or long soldering time (>3 seconds) may cause ceramic substrate cracking or resistance drift.
Layout heat dissipation optimization:
Increase the copper foil area below the resistors on the PCB (such as adding heat dissipation pads) to improve thermal conductivity efficiency.
Procurement and substitution:
The sulfur resistant models (EAM, TSL) and surge resistant models (EGM, TRL) are not interchangeable and must be selected strictly according to the scenario.
Universal models (ELR, TGL) can be interchangeable, but it is necessary to confirm whether TCR meets the temperature drift requirements.
4、 Final recommendation
Automotive/Industrial Scenarios → EAM16FT2R40DES (preferred, lower TCR) or TSL120610F2R40P05Z (secondary, higher cost-effectiveness).
Power/motor control → EGM16FT2R40DES (stronger surge resistance) or TRL120610F2R40P05Z (TCR ± 150ppm/℃ more balanced).
Consumer Electronics/Home Appliances → TGL120610F2R40P05Z (lowest price) or ELR16FT2R40DES (better brand reliability).
Operation suggestion:
Download the official specifications for each model, and focus on checking the pulse tolerance curve, vulcanization test report, and temperature derating chart (such as the EAM series' 155 ℃ high temperature stability data). Before bulk procurement, you can contact agents such as Fuliwei Technology and Shunhai Technology to obtain sample testing and tiered pricing.