Riedon™ FPM 3xx, 4xx Precision Foil Power Resistors by Bourns

Temperature Coefficient

4000

2000

0

-2000

-4000

-6000

-8000

-10000

-12000

-40

-20

0

20

40

60

80

100

120

140

TEMPERATURE (°C)

NOMINAL

Δ R/R

LIMIT 1

LIMIT 2

How To Order

FPM 325 4 H - 10R0 F A Q

Model

FPM302

FPM318

FPM325

FPM418

Terminals

2 = 2

4 = 4

Special Code

(blank) = Standard

H = Advanced Heat Sink

Resistance (Ω)

4 digits: “R” represents decimal point (example: R010 = 0.010 Ω

10R0 = 10 Ω, 100R = 100 Ω)

3 digits: “L” presents mΩ for resistance

(example: 3L20 = 0.0032 Ω, 6L80 = 0.0068 Ω)

Tolerance (%)

B = ±0.1

F = ±1

C = ±0.25

G = ±2

D = ±0.5

J = ±5

Terminal Type

K = Contact K (50 A max. current)

A = Contact A (150 A max. current)

F = Contact F (200 A max. current)

TCR (PPM/°C)

R = ±50

Q = ±25

P = ±15

Power Derating Curve

120

100

80

60

40

20

0

25

50

0.5 %

0.2 %

0.1 %

85

100

115

130

TEMPERATURE OF THE BACKPLATE (°C)

Power Rating Notes

The FPM Series Resistors must be attached to a suitable heat

sink. The maximum internal resistor temperature is 130 °C.

To specify an appropriate heat sink use the following formula:

RθH = TMAX - (P x RθR) - TA

P

Where: RθH = Thermal Resistance of Heat Sink (K/W)

RθR = Thermal Resistance of Resistor (K/W)

TMAX = Maximum Temperature of Resistor

TA = Ambient Temperature of Heat Sink (°C)

P = Power Through Resistor (W)

Specifications are subject to change without notice.

Users should verify actual device performance in their specific applications.

The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.

Packaging Specifications

FPM3022, FPM3182, FPM3254, FPM4184

Bulk ................................................................ 100 pcs. per box

FPM3254H

Bulk .................................................................. 50 pcs. per box

Typical Part Marking

FPM3182

2R00F A

MANUFACTURER’S

TRADEMARK

MODEL

NUMBER OF

TERMINALS

RESISTANCE CODE:

“R” REPRESENTS

DECIMAL POINT

(EXAMPLES: R005 = 0.005 Ω,

10R0 = 10 Ω)

RESISTANCE

TOLERANCE

TERMINAL TYPE