Product Overview
The RK73H series of flat chip resistors are precision-grade, thick-film resistors designed for high reliability and stability. 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 reliability. These resistors are suitable for automated mounting and reflow/wave soldering processes. They are RoHS compliant with lead-free terminations, and some models are AEC-Q200 qualified. Applications include automotive, medical, and aerospace equipment, where high safety and reliability are critical.
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, Alumina Substrate
- Certifications: EU RoHS Compliant, 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 (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 (100k1M), 250 (1091k) | 101M4 | 20V | 30V | 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 | 200 (1010M), 400 (19.1) | 1010M4 | 25V | 50V | 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 | 100 (101M), 200 (19.76), 200 (1.02M10M) | 101M, 1.02M10M | 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 (1.02k1M), 200 (19.76, 1.02M10M), 100 (101k), 200 (19.76) | 1.02k1M, 101k | 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 (101M), 200 (19.76), 400 (1.02M10M) | 101M, 1.02M10M | 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 (101M), 200 (19.76), 400 (1.02M5.6M) | 101M, 1.02M10M | 200V | 400V | 5,000, 4,000 |
| 2E (1210) | 2.60.2 x 15.5 W2H (2010) 1 | 0.5W | 70 | 125 | 100 (101M), 200 (19.76), 400 (1.02M5.6M) | 101M, 1.02M10M | 5,000, 4,000 | |||
| W2H (2010) 1 | 5.00.2 x 2.50.2 x 0.650.15 | 24.3 | 0.75W | 70 | 125 | 100 (101M), 200 (19.76), 400 (1.02M5.6M) | 101M, 1.02M10M | 4,000 | ||
| W3A (2512) 1 | 6.30.2 x 3.10.2 | 37.1 | 1W | 70 | 125 | 100 (101M), 200 (19.76), 400 (1.02M5.6M) | 101M, 1.02M10M | 200V (500V5) | 400V (500V5) | 4,000 |
| W3A2 (2512) 1 | 2W | 95 | 100 (101M), 200 (19.76), 400 (1.02M5.6M) | 101M, 1.02M10M | 200V | 400V | 4,000 |
Note: 1 Also available for RK73H 2H, 3A and 3A2 (different d dimensions = 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 |
| Resistance | Within specified tolerance | |
| Resistance Temperature Coefficient (T.C.R.) | Within specified T.C.R. | |
| Overload (Short time) | 1: 1F, 0.5: another (Rated voltage 2.5 for 5s; 1E, 2B, W3A2: Rated voltage 2 for 5s) | |
| Resistance to soldering heat | 1: 1FW3A (10R1M), 3: 1HW3A (R<10, R>1M) | 2605, 10s1s |
| Rapid change of temperature | 1: 1F, 0.5: another | -55 (30min.) /+125 (30min.), 100 cycles |
| Moisture resistance | 2: 1J, 2A, 2B, 3: another | 402, 90%95%RH, 1000h (1.5h ON/0.5h OFF cycle) |
| Endurance at 70 | 2: 1J, 2A, 2B, 3: 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 |
Note: Typical values for Resistance to soldering heat: 0.5: 1FW3A (10R1M), 1: 1HW3A (R<10, R>1M). Typical values for Rapid change of temperature: 0.5: 1F, 0.3: another. Typical values for Moisture resistance: 0.75: 1J, 2A, 2B, 1: another. Typical values for Endurance at 70: 0.75: 1J, 2A, 2B, 1: another. Typical values for High temperature exposure: 0.5: 1F, 0.3: another.
Precautions for Use
The alumina substrate of chip resistors may lead to solder cracks at the connection due to thermal stress from differences in thermal expansion coefficients with the mounting board. This is particularly true for larger sizes (W2H/W3A/W3A2) which have greater thermal expansion and self-heating. Cracks can occur when ambient temperature changes significantly or when load is repeatedly switched ON/OFF. While types 1F to 2E are less prone to cracking in general temperature cycle tests on FR-4 boards, W2H/W3A/W3A2 types tend to crack more easily. The occurrence of cracks due to thermal stress depends on factors like pad size, solder amount, and PCB heat dissipation. Therefore, careful design is required for applications with significant ambient temperature variations or load ON/OFF cycles. RK73H1F resistors may be damaged by static electricity generated during equipment assembly. Please exercise caution.
2410121533_KOA-RK73H1ETTP1803F_C276146.pdf
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