flat chip resistors KOA RK73H2BTTD4321F featuring triple layer electrode and compliance with EU RoHS standards
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, R1M) | 2605, 10s1s | 0.5 (1FW3A, 10R1M), 1 (1HW3A, R1M) | |
| 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.
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.