resistors
RF73
fusing flat chip resistor
EU
features
Performs like RK73 under normal conditions
Fuses when overloaded
Products with lead-free terminations meet EU RoHS
requirements. EU RoHS regulation is not intended for
Pb-glass contained in electrode, resistor element and glass.
Recognized by safety standard UL1412. (0603 (1J) is
not recognized)
dimensions and construction
Type Dimensions inches (mm)
L
(Inch Size Code) L Wc d t
c c
1J .063.008 .031.004 .012.004 .012.004
(0603) (1.60.2) (0.80.1) (0.30.1) (0.30.1)
.02.004
+.008
W .012
2A .079.008 .049.004 .016.008 -.004 (0.50.1)
(0805) (2.00.2) (1.250.1) (0.40.2) +0.2
Solder
(0.3 )
-0.1
Plating
2B .063.008
Ni
(1206) (1.60.2)
t
Plating .126.008
(3.20.2)
2E
.102.008
+.008
(1210) .016
(2.60.2)
d Protective Resistive Inner
.02.012 -.004 .024.004
Coating Film Electrode
+0.2
(0.50.3) (0.60.1)
2H .197.008 .098.008 (0.4 )
-0.1
(2010) (5.00.2) (2.50.2)
Ceramic
Substrate
3A .248.008 .122.008
(2512) (6.30.2) (3.10.2)
ordering information
RF73 2B T TD 100 J
Size Termination Nominal
Type Packaging Tolerance
Code Material Resistance
1J: 0603 T: Sn TD: 7" paper tape 2 significant J: 5%
(0603, 0805, 1206, 1210: figures + 1
2A: 0805 (Other termination
5,000 pieces/reel) multiplier
styles may be
2B: 1206
available, please TE: 7" embossed plastic R indicates
2E: 1210
contact factory (0805, 1206, 1210, 2010, decimal on
2H: 2010
for options) 2512: 4,000 pieces/reel) value <10
3A: 2512
For further information on packaging,
please refer to Appendix A.
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use. 11/08/17
76 KOA Speer Electronics, Inc. 199 Bolivar Drive Bradford, PA 16701 USA 814-362-5536 Fax: 814-362-8883 www.koaspeer.com
RF73
fusing flat chip resistor
applications and ratings
Maximum
Power T.C.R. Resistance Fusing Characteristics Operating
Part Resistance Open
Rating (ppm/C) Range Temperature
Designation Tolerance Circuit Fusing
@ 70C Max. E-24 Range
Fusing Power
Voltage Time
+1000 ~ -500
(1.0-3.3)
2.6W 2.4W 2.1W
RF731J
0.063W 1-100
1.0 1.1-20 22-100
500
(3.6-100)
3.0W 2.6W 2.4W 2.1W 2.0W
RF732A 0.1W 50V
0.2-0.47 0.51-1.0 1.1-20 22-100 110-510
60 -55C
3.75W 2.875W 2.5W 2.0W 1.75W
RF732B 0.125W J: 5% sec. to
+1000 ~ -500
0.2-0.47 0.51-10 11-24 27-100 110-510
max. +125C
(0.2-4.3)
4.5W 4.1W 3.5W 3.2W 3.0W
RF732E 0.25W 0.2-510
0.2-0.47 0.51-4.7 5.1-27 30-100 110-510
500
5.5W 5.0W 4.0W 3.5W 3.2W
(4.7-510)
RF732H 0.50W
0.2-0.47 0.51-4.7 5.1-27 30-100 110-510
100V
6.5W 6.0W 5.0W 4.5W 4.0W
RF733A 1.0W
0.2-0.47 0.51-4.7 5.1-30 33-100 110-510
Rated ambient temperature: +70C
environmental applications
Derating Curve One-Pulse Limiting Electric Power Example of Fusing Characteristics
30
25
20
10
15
10
3A
2H
5
2E
2B
1J,
1J, 2A 2A 2B 2E 2H 3A
1 1
.01 .1 1 10 100 0 1 2 3 4 5 6 7 8
Pulse Duration Fusing Power
(ms) (W)
For resistors operated at an ambient temperature
of 70C or above, a power rating shall be derated
in accordance with the above derating curve.
Performance Characteristics
Requirement R (% + 0.1 )
Parameter Limit Typical Test Method
Within specified
Resistance 25C
tolerance
Within specified
T.C.R. +25C/-55C and +25C/+125C
T.C.R.
Overload (Short Time) 5.0% 2.0% Rated voltage x 2 for 5 seconds (except 2E, 2H, 3A: x 1.5)
Resistance to Solder Heat 3.0% 0.5% 260C 5C for 10 seconds 1 second
0.3%: 2A~3A
0.5%: 2A~3A
Rapid Change of Temperature -55C (30 minutes)/ +125C (30 minutes) 5 cycles
0.6%: 1J
3.0%: 1J
Moisture Resistance 5.0% 2.0% 40C 2C, 90 - 95% RH, 500 hours, 1.5 hr ON, 0.5 hr OFF cycle
Endurance at 70C 5.0% 1.0% 70C 2C, 1000 hours, 1.5 hr ON, 0.5 hr OFF cycle
High Temperature Exposure 1.0% 0.6% +125C, 100 hours
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use. 11/21/16
KOA Speer Electronics, Inc. 199 Bolivar Drive Bradford, PA 16701 USA 814-362-5536 Fax: 814-362-8883 www.koaspeer.com 77
One-Pulse Limiting Electric Power (W)
Fusing TIme (Sec.)
resistors