Rev Date: 10/09/2014

3

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This specification may be changed at any time without prior notice

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Please confirm technical specifications before you order and/or use.

CF/CFM Series

Carbon Film Resistor

Stackpole Electronics, Inc.

Resistive Product Solutions

Resistor Type

K

RNF, RNMF

0.7

CF, CFM, HDM

0.8

ASR, SPR, ASRM, SPRM

1.0

RSPF, RSPL

0.9

RSF, RSMF

0.8

FRN

0.6

Repetitive Pulse Data:

If repetitive pulses are applied to resistors, pulse wave form must be less than “Pulse limiting voltage”, “Pulse

limiting current” or “Pulse limiting wattage” calculated by the formula below.

Vp

=

K√P x R x T/t

lp

=

K√P/R x T/t

Pp

=

K

Where:

Vp:

Pulse limiting voltage (V)

lp:

Pulse limiting current (A)

Pp:

Pulse limiting wattage (W)

P:

Power rating (W)

R:

Nominal resistance (ohm)

T:

Repetitive period (sec)

t:

Pulse duration (sec)

K:

Coefficient by resistors type (refer to below matrix)

[Vr: Rated Voltage (V), Ir: Rated Current (A)]

Note 1:

If T>10 → T = 10 (sec), T/t>1000 → T/t = 1000

Note 2:

If T>10 and T/t>1000, “Pulse Limiting power (Single pulse) is applied

Note 3:

If Vp<Vr (lp<lr or Pp<P), Vr (lr, P) is Vp (lp, Pp)

Note 4:

Pulse limiting voltage (Current, Wattage) is applied at less than rated ambient temperature. If

ambient temperature is more than the rated temperature (70º), please decrease power rating

according to “Power Derating Curve”

Note 5:

Please assure sufficient margin for use period and conditions for “Pulse limiting voltage”

Note 6:

If the pulse waveform is not square wave, please judge after transform the waveform into square

wave according to the “Waveform Transformation to Square Wave”.

Coefficient (K) Matrix