KOA RK73H Flat Chip Resistors (Precision Grade)
The KOA RK73H series are precision-grade flat chip resistors designed for high reliability in demanding applications. Featuring a small size, light weight, and excellent heat and weather resistance due to their metal glaze thick film construction, these resistors offer high stability with a triple-layer electrode structure. They are compatible with automated mounting processes and both flow and reflow soldering. The lead-free terminations meet EU-RoHS requirements, with exceptions for lead glass in the electrode, resistor element, and glass. Many models are AEC-Q200 qualified.
Product Attributes
- Brand: KOA
- Product Type: Flat Chip Resistors (Precision Grade)
- 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 company name and product catalog style)
Technical Specifications
| Type (Inch Size Code) | Dimensions (mm) L x W x c x d x t | Weight (g/1000pcs) | Power Rating | Rated Ambient Temp. | Rated Terminal Part Temp. | T.C.R. (10-6/K) | Resistance Range () | Max. Working Voltage | Max. Overload Voltage | 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 | 0.03W | 70 | 200, 250 | 1091k (250), 100k1M (200) 4 | 20V | 30V | 40,000, 20,000 | |
| 1H (0201) | 0.60.03 x 0.30.03 x 0.10.05 x 0.150.05 x 0.230.03 | 0.14 | 0.05W | 70 | 200, 400 | 19.1 (400), 101M (200), 1010M (200) 4 | 25V | 50V | , , 35,000, TC:10,000, TCM:15,000 | |
| 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 | 0.1W | 70 | 125 | 100, 200 | 19.76 (200), 101M (100), 1.02M10M (200) | 75V | 100V | , , TPL:20,000, TP:10,000 |
| 1J (0603) | 1.60.2 x 0.80.1 x 0.30.1 x 0.30.1 x 0.450.1 | 2.14 | 0.1W / 0.125W | 70 | 125 | 100, 200 | 101k (100, 0.125W), 1.02k1M (100, 0.1W), 19.76 (200, 0.125W), 1.02M10M (200, 0.1W) | / | / | , , TP:10,000, 5,000 |
| 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 | 0.25W | 70 | 125 | 100, 200, 400 | 19.76 (200), 101M (100), 1.02M10M (400) | 150V | 200V | , , TP:10,000, 5,000, 4,000 |
| 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 | 0.25W | 70 | 125 | 100, 200, 400 | 19.76 (200), 101M (100), 1.02M5.6M (400), 5.62M10M (400) | 200V | 400V | , , , 5,000, 4,000 |
| 2E (1210) | 2.60.2 x 15.5 (L x W) | 0.5W | 70 | 125 | 100, 200, 400 | 19.76 (200), 101M (100), 1.02M5.6M (400), 5.62M10M (400) | , , 5,000, 4,000 | |||
| W2H (2010) 1 | 5.00.2 x 2.50.2 x 0.650.15 (L x W x c) | 24.3 | 0.75W | 70 | 125 | 100, 200, 400 | 19.76 (200), 101M (100), 1.02M5.6M (400), 5.62M10M (400) | , , , 4,000 | ||
| W3A (2512) 1 | 6.30.2 x 3.10.2 (L x W) | 37.1 | 1W | 70 | 125 | 100, 200, 400 | 19.76 (200), 101M (100), 1.02M5.6M (400), 5.62M10M (400) | 200V (500V5) | 400V (500V5) | , , , 4,000 |
| W3A2 (2512) 1 | 6.30.2 x 3.10.2 (L x W) | 2W | 95 | 100, 200, 400 | 19.76 (200), 101M (100), 1.02M5.6M (400), 5.62M10M (400) | 200V | 400V | , , , 4,000 |
Note: 1: Also available for RK73H 2H, 3A, 3A2 (different "d" dimension = 0.4 +0.2 0.1 mm). 4: Nominal resistance value for RK73H1F (F:1%) and RK73H1H (1R9.1, 1MR10M) is E24. 5: Please consult for Max. working voltage and Max. overload voltage in parentheses.
Performance
| Test Items | Performance Requirements R(0.1 ) | Test Methods | Limit | Typical |
|---|---|---|---|---|
| Resistance | Within specified tolerance | |||
| Resistance Temperature Coefficient T.C.R. | Within specified T.C.R. | |||
| Overload (Short time) | 2 (1F), 0.5 (others) | Rated voltage 2.5 for 5s (1E, 2B, W3A2: Rated voltage2 for 5s) | ||
| Resistance to soldering heat | 1 (1FW3A, 10R1M), 3 (1HW3A, R<10, R>1M) | 2605, 10s1s | 0.5 (1FW3A, 10R1M), 1 (1HW3A, R<10, R>1M) | |
| Rapid change of temperature | 1 (1F), 0.5 (others) | -55 (30min.) /+125 (30min.), 100 cycles | 0.5 (1F), 0.3 (others) | |
| Moisture resistance | 2 (1J, 2A, 2B), 3 (others) | 402, 90%95%RH, 1000h (1.5h ON/0.5h OFF cycle) | 0.75 (1J, 2A, 2B), 1.5 (1F), 1 (others) | |
| Endurance at 70 | 2 (1J, 2A, 2B), 3 (others) | 702, 1000h (1.5h ON/0.5h OFF cycle) | 0.75 (1J, 2A, 2B), 1 (others) | |
| High temperature exposure | 1 | +125, 1000h (1F); +155, 1000h (1H,1E, 1J, 2A, 2B, 2E, W2H, W3A, W3A2) | 0.5 (1F), 0.3 (others) |
Precautions for Use
The substrate of chip resistors is alumina. Cracks may occur at the solder connection due to thermal expansion differences. This is more likely with larger sizes (W2H/W3A/W3A2) under repeated thermal stress, ambient temperature changes, or load ON/OFF cycles. Design considerations are crucial, especially for applications with significant temperature variation or load cycling. RK73H1F resistors may be susceptible to damage from static electricity during equipment assembly.
2410121533_KOA-RK73H2BTTD4321F_C880222.pdf
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