Precision Metal Film Fixed Resistors
SHI MENG ELECTRONIC CO.,LTD. offers Precision Metal Film Fixed Resistors designed for high-accuracy, high-stability, and high-reliability applications. These resistors feature low noise, small voltage coefficients, and low temperature coefficients, making them suitable for a wide range of electronic circuits. They comply with the latest environmental requirements of RoHS and REACH regulations.
Product Attributes
- Brand: SHI MENG ELECTRONIC CO.,LTD.
- Certifications: RoHS, REACH
Technical Specifications
| Type | Rated Power | Tolerance | Resistance Range | Temperature Coefficient (PPM/C) | Max Continuous Working Voltage (V) | Max Overload Voltage (V) | Insulation Resistance Voltage (V) | Operating Temp Range (C) |
|---|---|---|---|---|---|---|---|---|
| 1/8W | 1/8W | 0.1% (B), 0.25% (C), 0.5% (D), 1% (F), 2% (G) | 0.1~10M | 15, 25, 50, 100 | 200 | 400 | 300 | -55 ~ +125 |
| 1/6W | 1/6W | 0.1% (B), 0.25% (C), 0.5% (D), 1% (F), 2% (G) | 0.1~10M | 15, 25, 50, 100 | 200 | 400 | 300 | -55 ~ +125 |
| 1/4WS | 1/4W | 0.1% (B), 0.25% (C), 0.5% (D), 1% (F), 2% (G) | 0.1~10M | 15, 25, 50, 100 | 250 | 500 | 350 | -55 ~ +125 |
| 1/2WSS | 1/2W | 0.1% (B), 0.25% (C), 0.5% (D), 1% (F), 2% (G) | 0.1~10M | 15, 25, 50, 100 | 350 | 700 | 500 | -55 ~ +125 |
| 1/2WS | 1/2W | 0.1% (B), 0.25% (C), 0.5% (D), 1% (F), 2% (G) | 0.1~10M | 15, 25, 50, 100 | 500 | 1000 | 500 | -55 ~ +125 |
| 1WSS | 1W | 0.1% (B), 0.25% (C), 0.5% (D), 1% (F), 2% (G) | 0.1~10M | 15, 25, 50, 100 | 500 | 1000 | 500 | -55 ~ +125 |
| 1WS | 1W | 0.1% (B), 0.25% (C), 0.5% (D), 1% (F), 2% (G) | 0.1~2M | 15, 25, 50, 100 | 500 | 1000 | 500 | -55 ~ +125 |
| 2WSS | 2W | 0.1% (B), 0.25% (C), 0.5% (D), 1% (F), 2% (G) | 0.1~10M | 15, 25, 50, 100 | 500 | 1000 | 500 | -55 ~ +125 |
| 2WS | 2W | 0.1% (B), 0.25% (C), 0.5% (D), 1% (F), 2% (G) | 0.1~2M | 15, 25, 50, 100 | 500 | 1000 | 500 | -55 ~ +125 |
| 3WS | 3W | 0.1% (B), 0.25% (C), 0.5% (D), 1% (F), 2% (G) | 0.1~2M | 15, 25, 50, 100 | 500 | 1000 | 700 | -55 ~ +125 |
| 5WS | 5W | 0.1% (B), 0.25% (C), 0.5% (D), 1% (F), 2% (G) | 0.1~2M | 15, 25, 50, 100 | 500 | 1000 | 700 | -55 ~ +125 |
Construction
The resistors consist of a tinned copper lead wire, a high heat exchanged ceramic base, tin-plated steel caps, a high stability electric conduction film, color ring markings, and epoxy resin coating. Special coatings (gray or brick red non-flammable) are available upon request.
Performance
| Characteristic | Specification | Test Method |
|---|---|---|
| Temperature Coefficient (T.C.R.) | Normal products 1: 100PPM/. Reference values for resistance ranges: <1: 200PPM/; 1~10: 100PPM/; 10.1~100K: 50PPM/; 100K: 100PPM/. Special T.C.R. (50, 25, 15PPM/) available for 10. | R2-R1 *10^6 (PPM)/ / R1*(T2-T1) |
| Load Life | Resistance change (2%R+0.05) MAX. No mechanical damage. | 1000 hours operating at 702 with rated voltage or Max continuous working voltage (whichever is less), duty cycle 1.5hrs ON, 0.5hrs OFF. |
| Short Time Overload | Resistance change (0.5%R+0.05). | 2.5 times the rated voltage or maximum overload voltage (whichever is less), testing 5 seconds. |
| Insulation Resistance | 1000M or more. | Object placed in V-block. |
| Electric Withstanding Voltage | Resistance change (0.5%R+0.05). No evidence of flashover, mechanical damage, arcing or insulation breakdown. | Applied for 60 seconds at specified voltage. |
| Temperature Cycling | Resistance change (0.5%R+0.05) MAX. No mechanical damage. | 5 cycles of -253 (30 min), Room temp (10-15 min), 852 (30 min), Room temp (10-15 min). |
| Resistance to Soldering Heat | Resistance change (0.5%R+0.05). No mechanical damage. | Dipped in solder bath at 35010 for 30.5 sec or 2605 for 101 sec. |
| Solder Ability | 95% coverage minimum on lead wire. | Solder pot temperature: 2605, Dwell time: 30.5 sec. |
| Join Intensity | No terminal wire loosening and breakage shall occur. | Clamped at solder end and flipped outwards 90, twice. |
Precautions for Use
Due to the thin film of high resistance values (hundreds of K ohms), reliability may decrease, especially in high humidity environments. For ultra-high resistance values, consider using MG High Voltage Surge Resistors or Chip Resistors. For low resistance and ultra-low resistance applications where temperature coefficient or current capability is critical, KN Wire Wound Resistors are recommended. Precision metal film resistors have thinner films compared to other thin film resistors of the same size and resistance, resulting in lower pulse resistance. Avoid using high resistance products in high pulse or continuous pulse circuits. The conductive composition is prone to oxidation at high temperatures; ensure proper heat dissipation and avoid using adhesives on the surface, as they can hinder cooling and potentially react with the conductive film, causing failure.
2410121258_TyoHM-RN1WS120RFT-BA1_C385275.pdf
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