UNIROYAL ELECTRONICS INDUSTRY CO., LTD. - LEAD-FREE METAL FILM FIXED RESISTORS
This document specifies the Lead-Free Metal Film Fixed Resistors manufactured by UNIOHM. These resistors are designed for various applications requiring precise resistance values and reliable performance.
Product Attributes
- Brand: UNIROYAL ELECTRONICS INDUSTRY CO., LTD. (UNIOHM)
- Origin: CHINA
- Product Name: LEAD-FREE METAL FILM FIXED RESISTORS
- Part Name: MFR SERIES
- Certifications: JIS C 0802 (Marking)
Technical Specifications
| Type | Power Rating | Dimensions (mm) D x L x d0.05 | H3 | Max. Working Voltage | Max. Overload Voltage | Dielectric Withstanding Voltage | Resistance Range (Tolerance 1%, 2%) | Resistance Range (Tolerance 5%) |
| MF 1/8W | 1/8W | 1.90.3 x 3.30.3 x 0.45 | 28 | 200V | 400V | 400V | 10~1M | 1~1M |
| MF 1/4W | 1/4W | 2.20.3 x 6.51.0 x 0.54 | 28 | 250V | 500V | 500V | 10~1M | 1~1M |
| MF 1/2W | 1/2W | 3.00.6 x 9.51.0 x 0.54 | 28 | 350V | 700V | 700V | 10~1M | 1~1M |
| MF 1W | 1W | 4.50.6 x 11.51.0 x 0.65 | 28 | 500V | 1000V | 1000V | 51.1~1M | 1~1M |
| MF 2W | 2W | 5.00.6 x 15.51.0 x 0.70 | 28 | 500V | 1000V | 1000V | 51.1~1M | 1~1M |
| MF 3W | 3W | 6.00.6 x 17.51.0 x 0.75 | 28 | 500V | 1000V | 1000V | 51.1~1M | 1~1M |
| MF 1/4WS | 1/4WS | 1.90.5 x 3.30.3 x 0.45 | 28 | 200V | 400V | 200V | 10~1M | 1~1M |
| MF 0.4WSS | 0.4WSS | 1.90.5 x 3.30.3 x 0.45 | 28 | 200V | 400V | 200V | 10~1M | 1~1M |
| MF 1/2WSS | 1/2WSS | 2.20.5 x 6.50.5 x 0.54 | 28 | 250V | 500V | 250V | 10~1M | 1~1M |
| MF 1/2WS | 1/2WS | 2.70.5 x 9.01.0 x 0.54 | 28 | 350V | 700V | 700V | 10~1M | 1~1M |
| MF 0.6WS | 0.6WS | 2.20.5 x 6.51.0 x 0.54 | 28 | 250V | 500V | 250V | 10~1M | 1~1M |
| MF 1WS | 1WS | 3.50.6 x 9.51.0 x 0.60 | 28 | 350V | 700V | 350V | 10~1M | 10~1M |
| MF 2WS | 2WS | 4.00.6 x 11.51.0 x 0.65 | 28 | 500V | 1000V | 350V | 10~1M | 10~1M |
| MF 3WS | 3WS | 5.00.6 x 15.51.0 x 0.70 | 28 | 500V | 1000V | 350V | 10~1M | 10~1M |
Structure
| No. | Name | Material |
| 1 | Basic body | Rod type ceramics |
| 2 | Resistance layer | Metal Film |
| 3 | End cap | Cold steel plated with copper/tin |
| 4 | Lead wire | Tin solder coated copper wire |
| 5 | Joint | By Welding |
| 6 | Coating | 1. Inner paint: Celluloid resin 2. Outer paint: 2.1 Inflammable resin for normal size and 1/2W small size: Blue 2.2 Non-inflammable resin for other small size: Light Green 2.3 Non-inflammable resin for ultra-small size-0.4WSS: Deep Green |
| 7 | Color bands | Epoxy resin |
Marking
Resistors shall be marked with color bands in accordance with JIS C 0802.
Label Information
Label includes: Type and style, Nominal resistance, Resistance tolerance, Quantity, Lot. No., TCR: PPM.
Derating Curve
Resistors shall have a power rating based on continuous load operation at an ambient temperature from -55 to 70. If temperature is above 70, the load shall be derated.
Voltage Rating
RCWV = PR (Rated DC or RMS AC continuous working voltage). OVERLOAD Voltage is 2.5 times RCWV.
Specification Summary
| Item | Limits | Test Method |
| Temperature Coefficient | 0.1% | 15 PPM/Max. |
| 0.25% | 25 PPM/Max. | |
| 0.5% | 50PPM/Max. | |
| 1% | 50PPM/Max. | |
| 2% | 100PPM/Max. | |
| 5% | 200PPM/Max. | |
| Short-time overload | Resistance change rate: (0.5%+0.05)Max. | 4.13 |
| Dielectric withstanding voltage | No evidence of flashover, mechanical damage, arcing or insulation break down. | 4.7 |
| Pulse overload | Resistance change rate: (1%+0.05) Max. | 4.28 |
| Resistance to soldering heat | Resistance change rate: (1%+0.05) Max. | 4.18 |
| Resistance to solvent | No deterioration of protective coatings & markings | 4.29 |
| Terminal strength | No evidence of mechanical damage | 4.16 |
| Solderability | 95% coverage Min. | 4.17 |
| Temperature cycling | Resistance change rate: (1%+0.05) Max. | 4.19 |
| Load life in humidity | Normal type: 1.5%; flame retardant type: 5% | 7.9 |
| Load life | Normal type: 1.5%; flame retardant type: 5% | 4.25.1 |
2410121333_UNI-ROYAL-MFR0W4F1800A50_C58665.pdf
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