Product Overview
This document specifies the LEAD-FREE METAL FILM FIXED RESISTORS, MFR SERIES, manufactured by UNIROYAL ELECTRONICS INDUSTRY CO., LTD. These resistors are designed for various applications requiring precise resistance values and stable 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: Compliant with JIS C 0802 for color band marking.
Technical Specifications
| Type | Power Rating | Dimensions (mm) D x L x d0.05 | 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
Basic body: Rod type ceramics
Resistance layer: Metal Film
End cap: Cold steel plated with copper/tin
Lead wire: Tin solder coated copper wire
Joint: By Welding
Coating:
- Inner paint: Celluloid resin
- Outer paint:
- Inflammable resin (normal size & 1/2W small size): Blue
- Non-inflammable resin (other small size): Light Green
- Non-inflammable resin (ultra-small size-0.4WSS): Deep Green
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 are rated based on continuous load operation at ambient temperatures from -55 to 70. Derating is required above 70 as shown in the derating curve.
Voltage Rating
Resistors have DC and AC continuous voltage ratings. The Rated Continuous Working Voltage (RCWV) is calculated as RCWV = sqrt(P*R). Overload voltage is defined as 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. |
| Terminal strength | No evidence of mechanical damage | |
| 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 provided in the input text).
Order Procedure
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Standard Packing
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Notes
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2410121333_UNI-ROYAL-MFR0W4F9102A50_C61653.pdf
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