UNIROYAL ELECTRONICS INDUSTRY CO., LTD. - LEAD-FREE METAL FILM FIXED RESISTORS (MFR SERIES)
This specification outlines the requirements for Lead-Free Metal Film Fixed Resistors manufactured by UNIOHM. These resistors are designed for various electronic applications requiring stable and reliable performance.
Product Attributes
- Brand: UNIROYAL ELECTRONICS INDUSTRY CO., LTD. (UNIOHM)
- Product Name: LEAD-FREE METAL FILM FIXED RESISTORS
- Part Name: MFR SERIES
- Origin: CHINA
- Certifications: Compliant with JIS C 0802 for marking.
Technical Specifications
| Type | Dimensions (mm) | Max. Working Voltage (V) | Max. Overload Voltage (V) | Dielectric Withstanding Voltage (V) | Tolerance | Resistance Range |
|---|---|---|---|---|---|---|
| MF 1/8W | D: 1.90.3, L: 3.30.3, d: 0.45 | 200 | 400 | 400 | 1%, 2% | 10~1M |
| MF 1/8W | D: 1.90.3, L: 3.30.3, d: 0.45 | 200 | 400 | 400 | 5% | 1~1M |
| MF 1/4W | D: 2.20.3, L: 6.51.0, d: 0.54 | 250 | 500 | 500 | 1%, 2% | 10~1M |
| MF 1/4W | D: 2.20.3, L: 6.51.0, d: 0.54 | 250 | 500 | 500 | 5% | 1~1M |
| MF 1/2W | D: 3.00.6, L: 9.51.0, d: 0.54 | 350 | 700 | 700 | 1%, 2% | 10~1M |
| MF 1/2W | D: 3.00.6, L: 9.51.0, d: 0.54 | 350 | 700 | 700 | 5% | 1~1M |
| MF 1W | D: 4.50.6, L: 11.51.0, d: 0.65 | 500 | 1000 | 1000 | 1%, 2% | 51.1~1M |
| MF 1W | D: 4.50.6, L: 11.51.0, d: 0.65 | 500 | 1000 | 1000 | 5% | 1~1M |
| MF 2W | D: 5.00.6, L: 15.51.0, d: 0.70 | 500 | 1000 | 1000 | 1%, 2% | 51.1~1M |
| MF 2W | D: 5.00.6, L: 15.51.0, d: 0.70 | 500 | 1000 | 1000 | 5% | 1~1M |
| MF 3W | D: 6.00.6, L: 17.51.0, d: 0.75 | 500 | 1000 | 1000 | 1%, 2% | 51.1~1M |
| MF 3W | D: 6.00.6, L: 17.51.0, d: 0.75 | 500 | 1000 | 1000 | 5% | 1~1M |
| MF 1/4WS | D: 1.90.5, L: 3.30.3, d: 0.45 | 200 | 400 | 200 | 1%, 2% | 10~1M |
| MF 1/4WS | D: 1.90.5, L: 3.30.3, d: 0.45 | 200 | 400 | 200 | 5% | 1~1M |
| MF 0.4WSS | D: 1.90.5, L: 3.30.3, d: 0.45 | 200 | 400 | 200 | 1%, 2% | 10~1M |
| MF 0.4WSS | D: 1.90.5, L: 3.30.3, d: 0.45 | 200 | 400 | 200 | 5% | 1~1M |
| MF 1/2WSS | D: 2.20.5, L: 6.50.5, d: 0.54 | 250 | 500 | 250 | 1% | 10~1M |
| MF 1/2WSS | D: 2.20.5, L: 6.50.5, d: 0.54 | 250 | 500 | 250 | 2%, 5% | 1~1M |
| MF 1/2WS | D: 2.70.5, L: 9.01.0, d: 0.54 | 350 | 700 | 700 | 1%, 2% | 10~1M |
| MF 1/2WS | D: 2.70.5, L: 9.01.0, d: 0.54 | 350 | 700 | 700 | 5% | 1~1M |
| MF 0.6WS | D: 2.20.5, L: 6.51.0, d: 0.54 | 250 | 500 | 250 | 1% | 10~1M |
| MF 0.6WS | D: 2.20.5, L: 6.51.0, d: 0.54 | 250 | 500 | 250 | 2%, 5% | 1~1M |
| MF 1WS | D: 3.50.6, L: 9.51.0, d: 0.60 | 350 | 700 | 350 | 1%, 2%, 5% | 10~1M |
| MF 2WS | D: 4.00.6, L: 11.51.0, d: 0.65 | 500 | 1000 | 350 | 1%, 2%, 5% | 10~1M |
| MF 3WS | D: 5.00.6, L: 15.51.0, d: 0.70 | 500 | 1000 | 350 | 1%, 2%, 5% | 10~1M |
Specifications Summary
| Item | Limits | Test Method |
|---|---|---|
| Temperature Coefficient | 0.1% (15 PPM/Max.) 0.25% (25 PPM/Max.) 0.5% (50 PPM/Max.) 1% (50 PPM/Max.) 2% (100 PPM/Max.) 5% (200 PPM/Max.) | 4.8 |
| 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 |
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 are marked with color bands in accordance with JIS C 0802.
Label Information
Labels include Type and style, Nominal resistance, Resistance tolerance, Quantity, Lot. No., and TCR (PPM).
Derating Curve
Resistors have a power rating based on continuous load operation at an ambient temperature from -55 to 70. Derating is applied for temperatures above 70 as shown in Figure 1 (Figure not provided in source text).
Voltage Rating
Resistors have DC and AC continuous voltage ratings. The formula for Rated Continuous Working Voltage (RCWV) is P*R, where P is Power Rating and R is Nominal Resistance. Overload voltage is defined as 2.5 times RCWV.
Explanation of Part No. System
Details on the Part No. System are provided in Section 8.0 of the original document.
Order Procedure
Details on the order procedure are provided in Section 9.0 of the original document.
Standard Packing
Details on standard packing are provided in Section 10.0 of the original document.
Notes
General notes are provided in Section 11.0 of the original document.
2410121333_UNI-ROYAL-MFR0W4F1503A50_C58618.pdf
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