Product Overview
The SR73 series are low resistance flat chip resistors designed for current detection in power supply and motor circuits. They offer high reliability and performance with a resistance tolerance of 0.5% and a temperature coefficient of 10010-6/K. These resistors are suitable for both reflow and flow soldering and meet EU-RoHS requirements for lead-free termination. AEC-Q200 qualified (excluding 1H type).
Product Attributes
- Brand: KOA
- Product Line: SR73
- Type: Low Resistance Flat Chip Resistors
- Certifications: IEC 60115-8, JIS C 5201-8, EIAJ RC-2134C, AEC-Q200 (excluding 1H), EU-RoHS
- Material: Ceramic substrate, resistive film, internal electrode, Ni plating, solder plating
- Coating Color: Black (1H), Indigo (1E, 1J, 2A, 2B, 2E, W2H, W3A, W3A2)
- Terminal Surface Material: Sn (standard, lead-free), Au (1J, 2A, 2B for 0.1-10), Sn/Pb (L)
Technical Specifications
| Type (Inch Size Code) | Dimensions (mm) L x W x t | Weight (g/1000pcs) | Power Rating | Rated Ambient Temp. (C) | Rated Terminal Part Temp. (C) | T.C.R. (10-6/K) | Resistance Range () | Taping & Qty /Reel (pcs) | Resistance Tolerance |
| 1H (0201) | 0.60.03 x 0.30.03 x 0.230.03 | 0.14 | 0.1W | 70 | 04000 | 110 | TCM: 15,000 | D: 0.5% | |
| 1E (0402) | 1.0 x 0.5 x 0.350.05 | 0.68 | 0.166W | 70 | 125 | 2000 | 0.5110.0 | TPL: 20,000, TP: 10,000 | D: 0.5%, F: 1% |
| 1J (0603) | 1.60.2 x 0.8 x 0.450.1 | 2.14 | 0.2W | 70 | 125 | 2000 | 1.110. | TP: 10,000 | D: 0.5%, F: 1% |
| 1J (0603) | 1.60.2 x 0.8 x 0.450.1 | 2.14 | 0.25W | 70 | 125 | 2000 | 0.11 | TP: 10,000 | D: 0.5%, F: 1% |
| 2A (0805) | 2.00.2 x 1.250.1 x 0.50.1 | 4.54 | 0.33W | 70 | 125 | 1000 | 0.1510 | TP: 10,000 | D: 0.5%, F: 1% |
| 2A (0805) | 2.00.2 x 1.250.1 x 0.50.1 | 4.54 | 0.5W 5 | 105 | 1000 | 0.1510 | D: 0.5%, F: 1% | ||
| 2B (1206) | 3.20.2 x 1.60.2 x 0.60.1 | 9.14 | 0.33W | 70 | 125 | 1000 | 0.1510 | TD: 5,000 | D: 0.5%, F: 1% |
| 2B (1206) | 3.20.2 x 1.60.2 x 0.60.1 | 9.14 | 0.5W 5 | 110 | 1000 | 0.1510 | D: 0.5%, F: 1% | ||
| 2E (1210) | 2.60.2 x 1.60.2 x 0.60.1 | 15.50 | 0.5W | 70 | 125 | 1000 | 0.110. | TD: 5,000 | D: 0.5%, F: 1% |
| 2E (1210) | 2.60.2 x 1.60.2 x 0.60.1 | 15.50 | 0.66W 5 | 110 | 1000 | 0.110. | D: 0.5%, F: 1% | ||
| W2H (2010) | 5.00.2 x 2.50.2 x 0.650.15 | 24.30 | 0.75W | 70 | 125 | 1000 | 0.110. | TD: 4,000 | D: 0.5%, F: 1% |
| W3A (2512) | 6.30.2 x 3.10.2 x 0.650.15 | 37.10 | 1W | 70 | 125 | 1000 | 0.110. | TD: 4,000 | D: 0.5%, F: 1% |
| W3A2 (2512) | 6.30.2 x 3.10.2 x 0.650.15 | 37.10 | 2W | 95 | 1000 | 0.110. | TD: 4,000 | D: 0.5%, F: 1% |
Features
- Current detecting resistors for power supply, motor circuits, etc.
- High reliability and performance with resistance tolerance 0.5%, T.C.R. 10010-6/K
- Suitable for both reflow and flow solderings.
- Products with lead free termination meet EU-RoHS requirements.
- AEC-Q200 qualified (Exemption 1H).
Applications
- Car electronics, Computers, HDDs, Cellular-telephones, Power supplies, and Motor circuits, etc.
Derating Curve
For resistors operated at an ambient temperature of 70 or above, a power rating shall be derated in accordance with the derating curve. For resistors operated at terminal part temperature of described for each size or above, a power rating shall be derated in accordance with derating curve.
Precautions for Use
- Cracks may occur at the solder connection due to thermal stress from differences in thermal expansion coefficients between the chip resistor and the mounting board, especially with larger types (W2H, W3A, W3A2) due to greater thermal expansion and self-heating. Careful design is required for conditions involving significant ambient temperature changes or load ON/OFF cycles.
- The resistance value after soldering may change depending on the size of the pad pattern or solder amount. Confirm the effect of resistance value changes before designing.
2410121322_KOA-SR732ATTDR220F_C186581.pdf
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