High reliability flat chip resistors KOA RK73H2ATTD4993F with alumina substrate and RoHS compliance
KOA RK73H Flat Chip Resistors (Precision Grade)
The KOA RK73H series are precision-grade flat chip resistors designed for high-reliability applications. They feature a small size, light weight, and excellent heat and weather resistance due to their metal glaze thick film construction. The triple-layer electrode structure ensures high stability and reliability. These resistors are compatible with automatic mounters and suitable for both flow and reflow soldering. They are lead-free and comply with EU-RoHS requirements, with exemptions for lead glass in the electrode, resistor element, and glass. AEC-Q200 qualified data is available for most types. Applications include automotive, medical, and aerospace equipment where failure could lead to serious damage or loss of life; prior consultation with KOA is required for such uses.
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)
- Material: Metal glaze thick film (resistor element), Alumina (substrate)
- Certifications: EU-RoHS compliant (excluding lead glass), AEC-Q200 qualified (Exemption 1F)
- Origin: Japan (implied by company name and product origin)
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. | Resistance Range () | Max. Working Voltage | Max. Overload Voltage | T.C.R. (10-6/K) | 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 | 100k1M4 | 20V | 30V | 200, 250 | 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 | 0.05W | 70 | 101M, 1010M4 | 25V | 50V | 200, 400 | 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 | 0.1W | 70 | 125 | 101M | 75V | 100V | 100, 200 | 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 | 70 | 125 | 1.02k1M | 100, 200 | TP: 10,000, 5,000 | ||
| 1J (0603) | 1.60.2 x 0.80.1 x 0.30.1 x 0.30.1 x 0.450.1 | 2.14 | 0.125W | 70 | 125 | 101k | 100, 200 | 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 | 101M | 150V | 200V | 100, 200, 400 | 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 | 101M | 200V | 400V | 100, 200, 400 | 5,000, 4,000 |
| 2E (1210) | 2.60.2 x 15.5 (Dimensions incomplete in source) | (Weight incomplete in source) | 0.5W | 70 | 125 | 101M | 100, 200, 400 | 5,000, 4,000 | ||
| W2H (2010) | 5.00.2 x 2.50.2 x 0.650.15 (Dimensions incomplete in source) | 24.3 | 0.75W | 70 | 125 | 101M | 100, 200, 400 | 4,000 | ||
| W3A (2512) | 6.30.2 x 3.10.2 (Dimensions incomplete in source) | 37.1 | 1W | 70 | 125 | 101M | 200V (500V5) | 400V (500V5) | 100, 200, 400 | 4,000 |
| W3A2 (2512) | 6.30.2 x 3.10.2 (Dimensions incomplete in source) | (Weight incomplete in source) | 2W | 95 | 101M | 200V | 400V | 100, 200, 400 | 4,000 |
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. | -55/+25 and +25/+125 | ||
| Overload (Short time) | 1: 1F, 0.5: another (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: another | -55 (30min.) /+125 (30min.), 100 cycles | 0.5: 1F, 0.3: another | |
| Moisture resistance | 2: 1J, 2A, 2B, 3: another | 402, 90%95%RH, 1000h (1.5h ON/0.5h OFF cycle) | 0.75: 1J, 2A, 2B, 1: another | |
| Endurance at 70 | 2: 1J, 2A, 2B, 3: another | 702, 1000h (1.5h ON/0.5h OFF cycle) | 0.75: 1J, 2A, 2B, 1: another | |
| High temperature exposure | 1 | +125, 1000h: 1F, +155, 1000h: 1H,1E, 1J, 2A, 2B, 2E, W2H, W3A, W3A2 | 0.5: 1F, 0.3: another |
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