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flat chip resistors KOA RK73H2BTTD4321F featuring triple layer electrode and compliance with EU RoHS standards

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flat chip resistors KOA RK73H2BTTD4321F featuring triple layer electrode and compliance with EU RoHS standards

Power(Watts) : 250mW

Resistance : 4.32kΩ

Temperature Coefficient : ±100ppm/℃

Operating Temperature : -55℃~+155℃

Type : Thick Film Resistor

Tolerance : ±1%

Description : 250mW 4.32kΩ ±100ppm/℃ Thick Film Resistor ±1% 1206 Chip Resistor - Surface Mount RoHS

Mfr. Part # : RK73H2BTTD4321F

Model Number : RK73H2BTTD4321F

Package : 1206

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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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