Rev Date: 8/27/2021

4

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

RMEF Series

General Purpose Thick Film Chip Resistor

100% RoHS Compliant Without Exemption

Stackpole Electronics, Inc.

Resistive Product Solutions

Repetitive Pulse Information

(This information is for reference only and is not guaranteed performance.)

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.

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 (70°C), please decrease power rating according to “Power Derating

Curve”

Note 5:

Please assure sufficient margin fo

r 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

Resistor Type

K

R < 10 Ω

0.50

10 Ω ≤ R < 100 Ω

0.45

100 Ω ≤ R < 1K Ω

0.35

1K Ω ≤ R < 10K Ω

0.25

10K Ω ≤ R

0.20