Product Overview
This catalog features Low Power Type Metal Film Resistors, specifically Coat-Insulated Fixed Metal Film Resistors. These resistors offer high precision, low T.C.R., and excellent long-term stability. They are designed for automatic insertion and can be processed with various forming techniques. The products meet EU-RoHS requirements and are AEC-Q200 qualified (excluding MF1/2). They are suitable for general applications and have specific considerations for use in automotive, medical, and aerospace equipment, where malfunction could lead to serious damage or loss of life. Users are advised to contact the company for such applications.
Product Attributes
- Product Type: Low Power Type Resistors
- 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)
- Brand: KOA (implied by www.koaglobal.com)
Technical Specifications
Note: Specifications are subject to change without prior notice. Please confirm before ordering and/or use.
Dimensions
| Type | Dimensions (mm) L 0.2 | Dimensions (mm) C Max. | Dimensions (mm) D (Nominal) | Dimensions (mm) d (0.1) | Weight (g) (1000pcs) |
|---|---|---|---|---|---|
| MFS1/4 | 3.2 | 3.4 | 1.7 | 0.45 +0.2 / -0.1 | 28 |
| MF1/4 | 6.3 0.5 | 7.1 | 2.3 0.3 | 0.6 | 215 |
| MFS1/2 | 9.0 1.0 | 11.1 | 3.5 0.4 | 0.8 | 215 |
| MF1/2 | 9.0 1.0 | 11.1 | 3.5 0.4 | 0.8 | 360 |
* Lead length changes depending on taping and forming type.
Ratings
| Type | Power Rating | T.C.R. (10-6/K) | Resistance Range () | Max. Working Voltage | Max. Overload Voltage | Dielectric Withstanding Voltage | Taping & Q'ty/AMMO (pcs) |
|---|---|---|---|---|---|---|---|
| MFS1/4CC | 0.25W | C: 50 | 49.9562k | 250V | 500V | 300V | 3,000 |
| MFS1/4DC | D: 100 | 101M | 3,000 | ||||
| MF1/4CC | 0.25W | C: 50 | 102.21M | 500V | 2,000 | 2,000 | 2,000 |
| MF1/4DC | D: 100 | 102.21M | 2,000 | ||||
| MF1/4LC | L: 200 | 1.010 (0.5110) | 2,000 | ||||
| MFS1/2CC | 0.5W | C: 50 | 101M | 350V | 700V | 2,000 | 2,000 |
| MFS1/2DC | D: 100 | 102.21M | 2,000 | ||||
| MF1/2CC | 0.5W | C: 50 | 105.05M | 700V | 2,000 | 2,000 | |
| MF1/2DC | D: 100 | 105.11M | 2,000 | ||||
| MF1/2LC | 0.5W | L: 200 | 1.010 (0.5110) | 700V | 2,000 | 2,000 |
Rated Ambient Temperature: +70
Operating Temperature Range: -55+155
Rated voltage = Power RatingResistance value or Max. working voltage, whichever is lower.
Performance
| Test Items | Performance Requirements (Limit) | Typical Value | Test Methods |
|---|---|---|---|
| Resistance | Within specified tolerance | +25 | |
| T.C.R. | Within specified T.C.R. | +25/+125 | |
| Overload (Short time) | R(0.5% +0.05 ) | R0.3% | 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 | R0.75% : MFS1/4 R0.5% : MF1/4, MFS1/2, MF1/2 | R0.4% : MFS1/4 R0.25% : MF1/4, MFS1/2, MF1/2 | 2605, 10s1s |
| Rapid change of temperature | R1.0% | R0.3% | -55 (30min.)/+155 (30min.) 5 cycles |
| Moisture resistance | R1.5% : MFS1/4 R1% : MF1/4, MFS1/2, MF1/2 | R1% : MFS1/4 R0.75% : MF1/4, MFS1/2, MF1/2 | 402, 90%95%RH, 1000h (1.5h ON/0.5h OFF cycle) |
| Endurance at 70 | R1.5% : MFS1/4 R1% : MF1/4, MFS1/2, MF1/2 | R1% : MFS1/4 R0.75% : MF1/4, MFS1/2, MF1/2 | 702, 1000h (1.5h ON/0.5h OFF cycle) |
Reference Standards
- IEC 60115-2
- JIS C 5201-2
- EIAJ RC-2137
Type Designation
Example: MF T52 A F
| Element | Description |
|---|---|
| MF | Product Code |
| T52 | Taping & Forming (See Taping & Forming Matrix) |
| A | Packing (AMMO) |
| F | Resistance Tolerance (1%) |
| T.C.R. (10-6/K) (C:50, D:100, L:200) | |
| 1/4 | Power Rating (0.25W) |
| C | Terminal Surface Material (SnCu) |
Tolerance Codes: D: 0.5%, F: 1%, G: 2%
T.C.R. Codes: C: 50, D: 100, L: 200
Power Rating Codes: S1/4: 0.25W, 1/4: 0.25W, S1/2: 0.5W, 1/2: 0.5W
Packing Codes: A: AMMO, R: REEL, BOX
Nominal Resistance Codes: D, F: 4 digits, G: 3 digits
Taping & Forming Matrix
| Type | Axial Taping | Radial Taping | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| U Forming | M Forming | T26 | T52 | VT | VTP | VTE | MT | U | M5 | M10 | M12.5 | M15 |
| MFS1/4C | M5F | M5R | ||||||||||
| MF1/4C | M10F | M12.5R | ||||||||||
| MFS1/2C | M10R | |||||||||||
| MF1/2C | M12.5R | M15R | ||||||||||
: T.C.R.
Derating Curve
For resistors operated at an ambient temperature of 70C or above, a power rating shall be derated in accordance with the derating curve.
Rated Ambient Temperature: +70
Operating Temperature Range: -55+155
Precautions for Use
Ionic impurities such as flux, perspiration, salt, etc., attached to the product or PCB can negatively affect moisture and corrosion resistance. Cleaning is recommended to remove these ionic substances, especially when using lead-free solder which may contain more ionic impurities. Using RMA solder or RMA flux, or thorough washing is advised.
For details on environmental hazardous materials other than EU-RoHS, please contact us. For further information on taping, please refer to APPENDIX C on the back pages.
2409300002_KOA-MF1-4DCT52A2701F_C202432.pdf
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