KOA RK73H Flat Chip Resistors (Precision Grade)
The KOA RK73H series are precision-grade flat chip resistors featuring a thick film construction. They offer small size, light weight, and excellent heat and weather resistance due to their metal glaze thick film. The triple-layer electrode structure ensures high stability and reliability. These resistors are suitable for automatic mounting and compatible with both flow and reflow soldering. They meet EU-RoHS requirements with lead-free terminations. AEC-Q200 qualified data is available for most types.
Product Attributes
- Brand: KOA
- Product Type: Flat Chip Resistors (Precision Grade)
- Construction: Thick Film
- Coating Color: Black (1F, 1H), Blue (1E, 1J, 2A, 2B, 2E, W2H, W3A, W3A2)
- Certifications: EU-RoHS compliant (lead-free termination), AEC-Q200 qualified (Exemption 1F)
- Origin: Japan (implied by manufacturer)
Technical Specifications
| Type (Inch Size Code) | Dimensions (mm) L x W x c x d x t | Weight (1000pcs) (g) | Power Rating (W) | Rated Ambient Temp. (C) | Rated Terminal Part Temp. (C) | T.C.R. (10-6/K) | Resistance Range () | Max. Working Voltage (V) | Max. Overload Voltage (V) | Packaging & Q'ty/Reel (pcs) |
| 1F (01005) | 0.40.02 x 0.20.02 x 0.100.03 x 0.110.03 x 0.130.02 | 0.04 | 0.03 | 70 | 200 (100k2M), 250 (1091k) | 102M4 | 20 | 30 | 40,000 | |
| 1H (0201) | 0.60.03 x 0.30.03 x 0.10.05 x 0.150.05 x 0.230.03 | 0.14 | 0.05 | 70 | 125 | 200 (101M), 400 (19.1) | 1010M4 | 25 | 50 | 35,000 |
| 1E (0402) | 1.0+0.1-0.05 x 0.50.05 x 0.20.1 x 0.25+0.05-0.1 x 0.350.05 | 0.68 | 0.1 | 70 | 125 | 100 (101M), 200 (19.76) | 101M, 1.02M10M | 75 | 100 | 20,000 |
| 1J (0603) | 1.60.2 x 0.80.1 x 0.30.1 x 0.30.1 x 0.450.1 | 2.14 | 0.1 | 70 | 125 | 100 (1.02k1M), 200 (1.02M10M) | 1.02k1M, 1.02M10M | 10,000 | ||
| 2A (0805) | 2.00.2 x 1.250.1 x 0.40.2 x 0.3+0.2-0.1 x 0.50.1 | 4.54 | 0.25 | 70 | 125 | 100 (101M), 200 (19.76), 400 (1.02M10M) | 101M, 1.02M10M | 150 | 200 | 10,000 |
| 2B (1206) | 3.20.2 x 1.60.2 x 0.50.3 x 0.4+0.2-0.1 x 0.60.1 | 9.14 | 0.25 | 70 | 125 | 100 (101M), 200 (19.76), 400 (5.62M10M) | 101M, 1.02M10M | 200 | 400 | 5,000 |
| 2E (1210) | 2.60.2 x 15.5 x 0.60.1 x 0.4+0.2-0.1 x 0.60.1 | 0.5 | 70 | 125 | 100 (101M), 200 (19.76), 400 (5.62M10M) | 101M, 1.02M10M | 5,000 | |||
| W2H (2010) | 5.00.2 x 2.50.2 x 0.650.15 x 0.4+0.2-0.1 x 0.60.1 | 24.3 | 0.75 | 70 | 125 | 100 (101M), 200 (19.76), 400 (5.62M10M) | 101M, 1.02M10M | 4,000 | ||
| W3A (2512) | 6.30.2 x 3.10.2 x 0.70.15 x 0.4+0.2-0.1 x 0.60.1 | 37.1 | 1 | 70 | 125 | 100 (101M), 200 (19.76), 400 (5.62M10M) | 101M, 1.02M10M | 200 | 400 | 4,000 |
| W3A2 (2512) | 6.30.2 x 3.10.2 x 0.70.15 x 0.4+0.2-0.1 x 0.60.1 | 2 | 95 | 100 (101M), 200 (19.76), 400 (5.62M10M) | 101M, 1.02M10M | 200 | 400 | 4,000 |
Performance
| Test Items | Performance Requirements (R(0.1 )) | Limit | Typical | Test Methods |
| Resistance | Within specified tolerance | |||
| Temperature Coefficient of Resistance (T.C.R.) | Within specified T.C.R. | -55/+25/-55 and +25/+125 | ||
| Overload (Short time) | 1: 1F; 0.5: another (Rated voltage 2.5 for 5s) | 2 | 1 | (1E, 2B, W3A2: Rated voltage2 for 5s) |
| Resistance to soldering heat | 1: 1FW3A (10R1M); 3: 1HW3A (R<10, R>1M) | 0.5: 1FW3A (10R1M); 1: 1HW3A (R<10, R>1M) | 2605, 10s1s | |
| Rapid change of temperature | 1: 1F; 0.5: another | 0.5: 1F; 0.3: another | -55 (30min.) /+125 (30min.), 100 cycles | |
| Moisture resistance | 2: 1J, 2A, 2B; 3: another | 0.75: 1J, 2A, 2B; 1: 1F; 1: another | 402, 90%95%RH, 1000h (1.5h ON/0.5h OFF cycle) | |
| Endurance at 70 | 2: 1J, 2A, 2B; 3: another | 0.75: 1J, 2A, 2B; 1: another | 702, 1000h (1.5h ON/0.5h OFF cycle) | |
| High temperature exposure | 1 | 0.5: 1F; 0.3: another | +125, 1000h: 1F; +155, 1000h: 1H,1E, 1J, 2A, 2B, 2E, W2H, W3A, W3A2 |
Application Scenarios: Automotive equipment, medical equipment, aerospace equipment, and other applications where personal safety or significant loss may occur. These products are suitable for various automatic mounters and soldering processes.
Advantages: Small size, light weight, excellent heat and weather resistance, high stability and reliability, compatible with automatic mounting and soldering, lead-free termination meeting EU-RoHS.
Precautions: Risk of solder connection cracking due to thermal stress, especially for larger sizes (W2H/W3A/W3A2). RK73H1F resistors may be damaged by static electricity during equipment assembly. Always confirm terminal part temperature and product specifications before use.
2410121632_KOA-RK73H1ETTP2004F_C261899.pdf
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