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 meet EU-RoHS requirements. These resistors are suitable for general use and have achieved AEC-Q200 qualification (excluding MF1/2 models). While suitable for a wide range of applications, it is imperative to contact the manufacturer before using these products in critical applications such as automotive, medical, or aerospace equipment, as malfunction or failure could lead to severe consequences.
Product Attributes
- Brand: KOA Global (implied by www.koaglobal.com)
- Type: Low Power Type Resistors, Metal Film Resistors
- Coating Color: Light gray
- Marking: Color code
- Certifications: EU-RoHS compliant, AEC-Q200 qualified (Exemption MF1/2)
- Reference Standards: IEC 60115-2, JIS C 5201-2, EIAJ RC-2137
Technical Specifications
General Specifications:
| Specification | Details |
|---|---|
| Operating Temperature Range | -55+155 |
| Rated Ambient Temperature | +70 |
| Derating Curve Information | Power rating must be derated for ambient temperatures above 70C according to the provided curve. |
Model and Dimension Details:
| Type | Dimensions (mm) L | Dimensions (mm) C Max. | Dimensions (mm) D (Nominal) | Dimensions (mm) d (Nominal) | Weight (g) (1000pcs) |
|---|---|---|---|---|---|
| MFS1/4 | 3.20.2 | 3.4 | 1.7 +0.2 0.1 | 0.45 | 28 |
| MF1/4 | 6.30.5 | 7.1 | 2.30.3 | 0.6 | 215 |
| MFS1/2 | 9.01.0 | 11.1 | 3.50.4 | 0.6 | 360 |
| MF1/2 | 9.01.0 | 11.1 | 3.50.4 | 0.6 | 360 |
*Lead length changes depending on taping and forming type.
Type Designation Breakdown:
| Component | Description |
|---|---|
| MF | Metal Film Resistor |
| T52 A | Taping & Forming (See Taping & Forming Matrix) |
| F (Tolerance) | 1% (Other options: D 0.5%, G 2%) |
| D (TCR) | 100 10/K (Other options: C 50, L 200) |
| 1/4 (Power Rating) | 0.25W (Other options: S1/4 0.25W, S1/2 0.5W, 1/2 0.5W) |
| C (Terminal Surface Material) | SnCu |
| Product Code | (e.g., MFS1/4CC) |
| Packing | D: AMMO, R: REEL, BOX (Nil for Bulk) |
Ratings:
| Type | Power Rating | T.C.R. (10/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 | 0.25W | D: 100 | 49.9562k | 250V | 500V | 300V | 3,000 |
| MF1/4CC | 0.25W | C: 50 | 102.21M | 500V | - | - | 2,000 |
| MF1/4DC | 0.25W | D: 100 | 102.21M | 500V | - | - | 2,000 |
| MF1/4LC | 0.25W | L: 200 | 1.010 | 0.5110 | - | - | 2,000 |
| MFS1/2CC | 0.5W | C: 50 | 101M | 350V | 700V | 2,000 | 2,000 |
| MFS1/2DC | 0.5W | D: 100 | 101M | 350V | 700V | 2,000 | 2,000 |
| MF1/2CC | 0.5W | C: 50 | 105.05M | 700V | - | - | 2,000 |
| MF1/2DC | 0.5W | D: 100 | 105.11M | 700V | - | - | 2,000 |
| MF1/2LC | 0.5W | L: 200 | 1.010 | 0.5110 | - | - | 2,000 |
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) 0.5% (MFS1/2) | Applied for 5s at rated voltage 2.5 or Max. overload voltage, whichever is lower (MFS1/4, MF1/4, MF1/2). Applied for 5s at rated voltage 2 or Max. overload voltage, whichever is lower (MFS1/2). |
| Resistance to soldering heat | 0.75% (MFS1/4) 0.5% (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 from flux or other sources can affect moisture and corrosion resistance. Cleaning is recommended, especially when using lead-free solder or RMA flux. Contamination from perspiration or salt also impacts performance and requires cleaning.
2409300002_KOA-MF1-4CCT52A1201F_C315652.pdf
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