Product Overview
SHI MENG ELECTRONIC CO.,LTD. offers Precision Metal Film Fixed Resistors in various power ratings (1/8W to 5W) and miniaturized form factors. These resistors are designed for high accuracy, stability, and reliability, featuring low noise, low voltage coefficient, and low temperature coefficient. They comply with RoHS and REACH environmental regulations.
Product Attributes
- Brand: SHI MENG ELECTRONIC CO.,LTD.
- Certifications: RoHS, REACH
- Material: Nickel-Chromium alloy conductive layer
- Color: Blue epoxy resin coating (standard), Grey or Brick Red available for special order.
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) | Size (L1 x D1 x H3 mm) | Lead Wire Diameter (d0.06 mm) |
| 1/8W | 1/8W | 0.1% to 1% | 0 & 0.1~10M | 15, 25, 50, 100 | 200 | 400 | 300 | -55 to +125 | 3.5 x 1.7 x 27 | 0.45 |
| 1/6W | 1/6W | 0.1% to 1% | 0 & 0.1~10M | 15, 25, 50, 100 | 250 | 500 | 350 | -55 to +125 | 3.5 x 1.7 x 27 | 0.45 |
| 1/4WS | 1/4W | 0.1% to 1% | 0 & 0.1~10M | 15, 25, 50, 100 | 350 | 700 | 500 | -55 to +125 | 6.5 x 2.4 x 27 | 0.50 |
| 1/2WSS | 1/2W | 0.1% to 1% | 0 & 0.1~10M | 15, 25, 50, 100 | 500 | 1000 | 500 | -55 to +125 | 6.5 x 2.4 x 27 | 0.50 |
| 1/4W | 1/4W | 0.1% to 1% | 0 & 0.1~10M | 15, 25, 50, 100 | 500 | 1000 | 500 | -55 to +125 | 6.5 x 2.4 x 27 | 0.50 |
| 1/2WS | 1/2W | 0.1% to 1% | 0 & 0.1~10M | 15, 25, 50, 100 | 500 | 1000 | 500 | -55 to +125 | 9.2 x 3.3 x 26 | 0.60 |
| 1WSS | 1W | 0.1% to 1% | 0 & 0.1~10M | 15, 25, 50, 100 | 500 | 1000 | 500 | -55 to +125 | 9.2 x 3.3 x 26 | 0.60 |
| 1/2W | 1/2W | 0.1% to 1% | 0 & 0.1~10M | 15, 25, 50, 100 | 500 | 1000 | 500 | -55 to +125 | 11 x 4.5 x 28 | 0.70 |
| 1WS | 1W | 0.1% to 1% | 0 & 0.1~10M | 15, 25, 50, 100 | 500 | 1000 | 500 | -55 to +125 | 11 x 4.5 x 28 | 0.70 |
| 2WSS | 2W | 0.1% to 1% | 0 & 0.1~10M | 15, 25, 50, 100 | 500 | 1000 | 500 | -55 to +125 | 11 x 4.5 x 28 | 0.70 |
| 1W | 1W | 0.1% to 1% | 0.1~2M | 15, 25, 50, 100 | 500 | 1000 | 500 | -55 to +125 | 15 x 5.0 x 32 | 0.78 |
| 2WS | 2W | 0.1% to 1% | 0.1~2M | 15, 25, 50, 100 | 500 | 1000 | 500 | -55 to +125 | 15 x 5.0 x 32 | 0.78 |
| 3WS | 3W | 0.1% to 1% | 0.1~2M | 15, 25, 50, 100 | 500 | 1000 | 500 | -55 to +125 | 15 x 5.0 x 32 | 0.78 |
| 2W | 2W | 0.1% to 1% | 0.1~2M | 15, 25, 50, 100 | 500 | 1000 | 500 | -55 to +125 | 18 x 6.0 x 33 | 0.78 |
| 3W | 3W | 0.1% to 1% | 0.1~2M | 15, 25, 50, 100 | 500 | 1000 | 500 | -55 to +125 | 18 x 6.0 x 33 | 0.78 |
| 5WS | 5W | 0.1% to 1% | 0.1~2M | 15, 25, 50, 100 | 500 | 1000 | 700 | -55 to +125 | 18 x 6.0 x 33 | 0.78 |
| 3W | 3W | 0.1% to 1% | 0.1~2M | 15, 25, 50, 100 | 500 | 1000 | 500 | -55 to +125 | 25 x 8.0 x 38 | 0.78 |
| 5W | 5W | 0.1% to 1% | 0.1~2M | 15, 25, 50, 100 | 500 | 1000 | 700 | -55 to +125 | 25 x 8.0 x 38 | 0.78 |
Notes:
0 resistance range is 50m.
Special requirements such as non-flammable coating and solvent-resistant color codes should be specified at the time of order.
For vertical mounting, lead wire length at the root is 1.5mm.
Performance Characteristics
| Characteristic | Specification | Test Method |
| Temperature Coefficient (T.C.R.) | Standard: 100PPM/ (for 1). For <1, reference values apply. Special T.C.R. (50, 25, 15 PPM/) available for 10 upon request. | Calculated based on resistance change over temperature. |
| Load Life | Resistance change (2%R+0.05) MAX. No mechanical damage. | 1000 hours 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 rated voltage or maximum overload voltage (whichever is less), for 5 seconds. |
| Insulation Resistance | 1000M | Tested by placing the unit in a V-groove. |
| Electric Withstanding Voltage | Resistance change (0.5%R+0.05). No flashover, mechanical damage, arcing, or insulation breakdown. | Applied for 60 seconds at specified voltages. |
| Temperature Cycling | Resistance change (0.5%R+0.05) MAX. No mechanical damage. | 5 cycles of temperature steps: -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. | Immersion in solder bath at 35010 for 30.5 sec, or 2605 for 101 sec. |
| Solder Ability | 95% coverage minimum on lead wire. | Solder bath temperature: 2605, Dwell time: 30.5 sec. |
| Join Intensity | No terminal wire loosening or breakage. | Clamped at the solder end and flipped outwards 90, repeated twice. |
Precautions for Use:
High resistance values (hundreds of K ohms) can have reduced reliability, especially in humid environments. Consider using MG High Voltage Surge Resistors or Chip Resistors for ultra-high resistance applications.
For low resistance applications where temperature coefficient or current capability is critical, consider KN Wire Wound Resistors.
Precision metal film resistors have thinner film layers and are less resistant to pulses compared to other film resistor types. Avoid high resistance products in high pulse or continuous pulse circuits.
Due to the high-temperature oxidation susceptibility of the conductive layer, pay attention to surface temperature rise and surrounding cooling conditions for high-power products. Avoid fixing or potting with glues on the resistor surface, as they can impede heat dissipation and potentially cause electrochemical reactions leading to failure.
2410121258_TyoHM-RN1WS33RFT-BA1_C385377.pdf
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