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 (R<10, R>1M)	2605, 10s1s	0.5: 1FW3A (10R1M), 1: 1HW3A (R<10, R>1M)
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

2410121533_KOA-RK73H2ATTD4993F_C317482.pdf

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