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 suitable for automated mounting processes and both flow and reflow soldering. They comply with EU-RoHS requirements for lead-free terminations. AEC-Q200 qualified (excluding 1F).
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)
- Application Scenarios: Automotive equipment, medical equipment, aerospace equipment, and other safety-critical or high-loss potential applications.
Technical Specifications
| Type (Inch Size Code) | Dimensions (mm) L | Dimensions (mm) W | Dimensions (mm) c | Dimensions (mm) d | Dimensions (mm) 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 | 0.20.02 | 0.100.03 | 0.110.03 | 0.130.02 | 0.04 | 0.03W | 70 | 200 | 100k1M4 | 20V | 30V | 40,000 | ||
| 1H (0201) | 0.60.03 | 0.30.03 | 0.10.05 | 0.150.05 | 0.230.03 | 0.14 | 0.05W | 70 | 200 | 101M, 1010M4 | 25V | 50V | 35,000 | ||
| 1E (0402) | 1.0 +0.1 0.05 | 0.50.05 | 0.20.1 | 0.25 +0.05 0.1 | 0.350.05 | 0.68 | 0.1W | 70 | 125 | 100 | 101M | 75V | 100V | TPL20,000, TP 10,000 | |
| 1J (0603) | 1.60.2 | 0.80.1 | 0.30.1 | 0.30.1 | 0.450.1 | 2.14 | 0.1W | 70 | 125 | 100 | 1.02k1M | TP 10,000, 5,000 | |||
| 2A (0805) | 2.00.2 | 1.250.1 | 0.40.2 | 0.3 +0.2 0.1 | 0.50.1 | 4.54 | 0.25W | 70 | 125 | 100 | 101M | 150V | 200V | TP 10,000, 5,000, 4,000 | |
| 2B (1206) | 3.20.2 | 1.60.2 | 0.50.3 | 0.4 +0.2 0.1 | 0.60.1 | 9.14 | 0.25W | 70 | 125 | 100 | 101M | 200V | 400V | 5,000, 4,000 | |
| 2E (1210) | 2.60.2 | 15.5 | W2H (2010) 1 | 5.00.2 | 2.50.2 | 0.650.15 | 24.3 | 0.75W | 70 | 125 | 100 | 101M | 4,000 | ||
| W3A (2512) 1 | 6.30.2 | 3.10.2 | 37.1 | 1W | 70 | 125 | 100 | 101M | 200V (500V5) | 400V (500V5) | 4,000 | ||||
| W3A2 (2512) 1 | 2W | 95 | 100 | 101M | 200V | 400V | 4,000 |
Note on Dimensions: For W2H, W3A, W3A2 types, dimensions L, W, c, d, t are 5.00.2, 2.50.2, 0.650.15, 24.3; 6.30.2, 3.10.2, 37.1 respectively. 1 RK73H 2H, 3A and 3A2 are also still available (different d dimensions=0.4 +0.2 0.1 mm).
Note on Resistance Range: 4 The nominal resistance value for RK73H1F (F1%) and RK73H1H1R9.1, 1MR10M) is E24.
Note on Voltage: 5 Please consult with us about the Max. working voltage and the Max. overload voltage with ( ).
Operating Temperature Range: -55+125 (1H), -55+155 (1H1E1J2A2B2EW2HW3AW3A2)
Rated Voltage: Power RatingResistance value or Max. working voltage, whichever is lower.
Performance
| Test Items | Performance Requirements | Test Methods |
|---|---|---|
| Resistance | Within specified tolerance | |
| Resistance Temperature Coefficient (T.C.R.) | Within specified T.C.R. | -25 / +25/-55 and +25/+125 |
| 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 |
| Rapid change of temperature | 1% (1F), 0.5% (others) | -55 (30min.) /+125 (30min.) 100 cycles |
| Moisture resistance | 2% (1J, 2A, 2B), 3% (others) | 402, 90%95%RH, 1000h (1.5h ON/0.5h OFF cycle) |
| Endurance at 70 | 2% (1J, 2A, 2B), 3% (others) | 702, 1000h (1.5h ON/0.5h OFF cycle) |
| High temperature exposure | 1% | +125, 1000h: 1F / +155, 1000h: 1H,1E, 1J, 2A, 2B, 2E, W2H, W3A, W3A2 |
Precautions for Use
The substrate of chip resistors is alumina. Cracks may occur at the connection of solder (solder fillet portion) due to the difference of the coefficient of thermal expansion from the mounting board when heat stress like heat cycle, etc. are repeatedly applied. Care should be taken to the occurrence of cracks when ambient temperature changes or load ON/OFF is repeated, especially for large types (W2H/W3A/W3A2) which have large thermal expansion and self-heating. While general temperature cycle tests on glass-epoxy (FR-4) boards do not easily cause cracks in types 1F2E, types W2H/W3A/W3A2 tend to be more prone to cracking. Cracks caused by thermal stress depend on factors such as the size of the mounted pad, solder volume, and heat dissipation of the mounting board. Therefore, careful design is required when operating under conditions with significant ambient temperature variations or load ON/OFF cycles.
RK73H1F resistors may be damaged by static electricity generated during equipment assembly processes. Please exercise caution.
2410121533_KOA-RK73H1ETTP3012F_C880128.pdf
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