Product Overview
The Low Power Type Resistors, specifically the Coat-Insulated Fixed Metal Film Resistors (MF series), are high-precision, low T.C.R. metal film resistors designed for automatic insertion and various forming processes. They offer excellent long-term stability and comply with EU-RoHS requirements. These resistors are qualified for AEC-Q200 (excluding MF1/2 models) and are suitable for applications requiring high reliability. However, for critical applications such as automotive, medical, or aerospace equipment, direct contact with the company is mandatory due to the potential for serious damage or loss of life in case of malfunction.
Product Attributes
- Product Type: Low Power Type Resistors
- Series: METAL FILM MF
- Sub-Type: Coat-Insulated Fixed Metal Film Resistors
- Coating Color: Light gray
- Marking: Color code
- Certifications: EU-RoHS compliant, AEC-Q200 qualified (Exemption MF1/2)
- Origin: Not specified
- Brand: KOA (implied by URL www.koaglobal.com)
Technical Specifications
| Model | Power Rating (W) | T.C.R. (10-6/K) | Resistance Range () | Max. Working Voltage (V) | Max. Overload Voltage (V) | Dielectric Withstanding Voltage (V) | Dimensions (mm) L x C Max. x D x d (Nominal) | Weight (g/1000pcs) |
|---|---|---|---|---|---|---|---|---|
| MFS1/4C | 0.25 | C: 50 | 49.9562k | 250 | 500 | 300 | 3.20.2 x 3.4 x 1.7 +0.2/0.1 x 0.45 | 28 |
| MFS1/4D | 0.25 | D: 100 | 101M | 250 | 500 | 300 | 3.20.2 x 3.4 x 1.7 +0.2/0.1 x 0.45 | 28 |
| MF1/4C | 0.25 | C: 50 | 102.21M | 500 | 2000 | - | 6.30.5 x 7.1 x 2.30.3 x 0.6 | 215 |
| MF1/4D | 0.25 | D: 100 | 102.21M | 500 | 2000 | - | 6.30.5 x 7.1 x 2.30.3 x 0.6 | 215 |
| MF1/4L | 0.25 | L: 200 | 1.010 | - | 0.5110 | - | 6.30.5 x 7.1 x 2.30.3 x 0.6 | 215 |
| MFS1/2C | 0.5 | C: 50 | 101M | 350 | 700 | 2000 | 9.01.0 x 11.1 x 3.50.4 x - | 360 |
| MFS1/2D | 0.5 | D: 100 | 102.21M | 350 | 700 | 2000 | 9.01.0 x 11.1 x 3.50.4 x - | 360 |
| MF1/2C | 0.5 | C: 50 | 105.05M | 700 | - | 2000 | 9.01.0 x 11.1 x 3.50.4 x - | 360 |
| MF1/2D | 0.5 | D: 100 | 105.11M | 700 | - | 2000 | 9.01.0 x 11.1 x 3.50.4 x - | 360 |
| MF1/2L | 0.5 | L: 200 | 1.010 | - | 0.5110 | - | 9.01.0 x 11.1 x 3.50.4 x - | 360 |
Reference Standards: IEC 60115-2, JIS C 5201-2, EIAJ RC-2137
Rated Ambient Temperature: +70
Operating Temperature Range: -55+155
Note: Rated voltage is the lower of (Power Rating Resistance value) or Max. working voltage.
Performance
| Test Item | Performance Requirements (Limit) | Test Methods |
|---|---|---|
| Resistance | Within specified tolerance | +25 |
| T.C.R. | Within specified T.C.R. | +25/+125 |
| Overload (Short time) | 0.5% (MFS1/4, MF1/4, MF1/2), 0.75% (MFS1/2) | Rated voltage 2.5 or Max. overload vol., whichever is lower, for 5s (MFS1/4, MF1/4, MF1/2); Rated voltage 2 or Max. overload vol., whichever is lower, for 5s (MFS1/2) |
| Resistance to soldering heat | 0.4% (MFS1/4), 0.25% (MF1/4, MFS1/2, MF1/2) | 2605, 10s1s |
| Rapid change of temperature | 1.0% | -55 (30min.) / +155 (30min.), 5 cycles |
| Moisture resistance | 1.5% (MFS1/4), 1% (MF1/4, MFS1/2, MF1/2) | 402, 90%95%RH, 1000h (1.5h ON/0.5h OFF cycle) |
| Endurance at 70 | 1.5% (MFS1/4), 1% (MF1/4, MFS1/2, MF1/2) | 702, 1000h (1.5h ON/0.5h OFF cycle) |
Precautions for Use
Ionic impurities such as flux attached to the product or PCB can affect moisture and corrosion resistance. Cleaning is recommended to remove these substances, especially when using lead-free solder. Exposure to perspiration, salt, or other environmental contaminants can also impact performance, necessitating cleaning to remove ionic substances.
2409300002_KOA-MF1-4CCT52A1502F_C315654.pdf
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