Product Overview
This document specifies Lead-Free Metal Film Fixed Resistors manufactured by UNIOHM. These resistors are designed for various applications requiring precise resistance values and reliability.
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 | Tolerance | Resistance Range |
| MF 1/8W | 1/8W | 1.90.3 x 3.30.3 x 0.45 | 28 | 200V | 400V | 400V | 1%2% | 10~1M |
| MF 1/8W | 1/8W | 1.90.3 x 3.30.3 x 0.45 | 28 | 200V | 400V | 400V | 5% | 1~1M |
| MF 1/4W | 1/4W | 2.20.3 x 6.51.0 x 0.54 | 28 | 250V | 500V | 500V | 1%2% | 10~1M |
| MF 1/4W | 1/4W | 2.20.3 x 6.51.0 x 0.54 | 28 | 250V | 500V | 500V | 5% | 1~1M |
| MF 1/2W | 1/2W | 3.00.6 x 9.51.0 x 0.54 | 28 | 350V | 700V | 700V | 1%2% | 10~1M |
| MF 1/2W | 1/2W | 3.00.6 x 9.51.0 x 0.54 | 28 | 350V | 700V | 700V | 5% | 1~1M |
| MF 1W | 1W | 4.50.6 x 11.51.0 x 0.65 | 28 | 500V | 1000V | 1000V | 1%2% | 51.1~1M |
| MF 1W | 1W | 4.50.6 x 11.51.0 x 0.65 | 28 | 500V | 1000V | 1000V | 5% | 1~1M |
| MF 2W | 2W | 5.00.6 x 15.51.0 x 0.70 | 28 | 500V | 1000V | 1000V | 1%2% | 51.1~1M |
| MF 2W | 2W | 5.00.6 x 15.51.0 x 0.70 | 28 | 500V | 1000V | 1000V | 5% | 1~1M |
| MF 3W | 3W | 6.00.6 x 17.51.0 x 0.75 | 28 | 500V | 1000V | 1000V | 1%2% | 51.1~1M |
| MF 3W | 3W | 6.00.6 x 17.51.0 x 0.75 | 28 | 500V | 1000V | 1000V | 5% | 1~1M |
| MF 1/4WS | 1/4WS | 1.90.5 x 3.30.3 x 0.45 | 28 | 200V | 400V | 200V | 1%2% | 10~1M |
| MF 1/4WS | 1/4WS | 1.90.5 x 3.30.3 x 0.45 | 28 | 200V | 400V | 200V | 5% | 1~1M |
| MF 0.4WSS | 0.4WSS | 1.90.5 x 3.30.3 x 0.45 | 28 | 200V | 400V | 200V | 1%2% | 10~1M |
| MF 0.4WSS | 0.4WSS | 1.90.5 x 3.30.3 x 0.45 | 28 | 200V | 400V | 200V | 5% | 1~1M |
| MF 1/2WSS | 1/2WSS | 2.20.5 x 6.50.5 x 0.54 | 28 | 250V | 500V | 250V | 1% | 10~1M |
| MF 1/2WSS | 1/2WSS | 2.20.5 x 6.50.5 x 0.54 | 28 | 250V | 500V | 250V | 2%5% | 1~1M |
| MF 1/2WS | 1/2WS | 2.70.5 x 9.01.0 x 0.54 | 28 | 350V | 700V | 700V | 1%2% | 10~1M |
| MF 1/2WS | 1/2WS | 2.70.5 x 9.01.0 x 0.54 | 28 | 350V | 700V | 700V | 5% | 1~1M |
| MF 0.6WS | 0.6WS | 2.20.5 x 6.51.0 x 0.54 | 28 | 250V | 500V | 250V | 1% | 10~1M |
| MF 0.6WS | 0.6WS | 2.20.5 x 6.51.0 x 0.54 | 28 | 250V | 500V | 250V | 2%5% | 1~1M |
| MF 1WS | 1WS | 3.50.6 x 9.51.0 x 0.60 | 28 | 350V | 700V | 350V | 1%2%5% | 10~1M |
| MF 2WS | 2WS | 4.00.6 x 11.51.0 x 0.65 | 28 | 500V | 1000V | 350V | 1%2%5% | 10~1M |
| MF 3WS | 3WS | 5.00.6 x 15.51.0 x 0.70 | 28 | 500V | 1000V | 350V | 1%2%5% | 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: Inflammable/Non-inflammable resin (color varies by type) |
| 7 | Color bands | Epoxy resin |
Marking
Resistors are marked with color bands in accordance with JIS C 0802.
Label
Labels include Type and style, Nominal resistance, Resistance tolerance, Quantity, Lot. No., and TCR.
Derating Curve
Resistors have a power rating based on continuous load operation at an ambient temperature from -55 to 70. Derating is required above 70.
Voltage Rating
Resistors have DC and AC continuous voltage ratings. The formula for Rated DC or RMS AC continuous working voltage (RCWV) is P*R, where P is Power Rating and R is Nominal Resistance. Overload voltage is 2.5 times RCWV.
Specifications and Test Methods (JIS-C-5201&5202)
| Item | Limits | Test Method |
| Temperature Coefficient | 0.1% (15 PPM/Max.) | 4.8 Natural resistance changes per temp. Degree centigrade R2 R1 R1(T2 T1) 106(PPM/) R1: resistance value at room temp. (T1) R2: resistance value at room temp. +100 (Tt2) Test pattern: room temp. (T1), room temp. +100(T2) |
| Temperature Coefficient | 0.25% (25 PPM/Max.) | |
| Temperature Coefficient | 0.5% (50PPM/Max.) | |
| Temperature Coefficient | 1% (50PPM/Max.) | |
| Temperature Coefficient | 2% (100PPM/Max.) | |
| Temperature Coefficient | 5% (200PPM/Max.) | |
| Short-time overload | Resistance change rate is: (0.5%+0.05)Max. With no evidence of mechanical damage. | 4.13 Permanent resistance change after the application of a potential of 2.5 times RCWV for 5 seconds. |
| Dielectric withstanding voltage | No evidence of flashover mechanical damage, arcing or insulation break down. | 4.7 Resistors shall be clamped in the trough of a 90metallic v-block and shall be tested at ac potential respectively specified in the above list for 60-70 seconds. |
| Pulse overload | Resistance change rate is: (1%+0.05) Max. With no evidence of mechanical damage. | 4.28 Resistance change after 10,000 cycles (1 second ON , 25 seconds OFF ) at 4 times RCWV. |
| Resistance to soldering heat | Resistance change rate is: (1%+0.05) Max. With no evidence of mechanical damage | 4.18 Permanent resistance change when leads immersed to a point 2.0-2.5mm from the body in 2605 solder for 101 seconds. |
| Resistance to solvent | No deterioration of protective coatings & markings | 4.29 Specimens shall be immersed in a bath of trichloroethylene completely for 3 min. With ultrasonic |
| Terminal strength | No evidence of mechanical damage | 4.16 Direct load: Resistance to a 2.5 kg direct load for 10 seconds in the direction of the longitudinal axis of the terminal leads. Twist test: Terminal leads shall be bent through 90at a point of about 6mm from the body of the resistor and shall be rotated through 360 about the original axis of the bent terminal in alternating direction for a total of 3 rotations. |
| Solderability | 95% coverage Min. | 4.17 The area covered with a new, smooth, clean, shiny and continuous surface free from concentrated pinholes. Test temp. Of solder:2453 Dwell time in solder: 2~3seconds. |
| Temperature cycling | Resistance change rate is: (1%+0.05) Max.. With no evidence of mechanical damage. | 4.19 Resistance change after continuous five cycles for duty cycle specified: Step Temperature Time 1 -55 3 30min 2 Room temp. 10 15min 3 +155 2 30min 4 Room temp. 10 15min |
| Load life in humidity | Normal type: 1.5%; flame retardant type: 5% | 7.9 resistance change after 1,000 hours (1.5 hours ON,0.5 hour OFF) at RCWV in a humidity test chamber controlled at 402 and 90 to 95% relative humidity. |
| Load life | Normal type: 1.5%; flame retardant type: 5% | 4.25.1 permanent resistance change after 1,000 hours operating at RCWV with duty cycle of 1.5 hours ON, 0.5 hour OFF at 702 ambient. |
Explanation of Part No. System
The part number system explains the configuration of the product. (Details not fully provided in the input text.)
2410121333_UNI-ROYAL-MFR0W4F5601A50_C58603.pdf
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