Rev Date: 11/23/2020

2

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

WWF Series

General Purpose Fusing Wirewound Resistor

Stackpole Electronics, Inc.

Resistive Product Solutions

Power Derating Curve:

Recommended Solder Profile

This information is intended as a reference for solder profiles for Stackpole resistive components. These profiles should

be compatible with most soldering processes. These are only recommendations. Actual numbers will depend on board

density, geometry, packages used, etc., especially those cells labeled with “*”.

100% Matte Tin / RoHS Compliant Terminations

Soldering iron recommended temperatures: 330°C to 350°C with minimum duration.

Maximum number of reflow cycles: 3.

Performance Characteristics

Test

Test Specification

Fuse Test @ 220 Vac

(1)

Typically fuses in less than 1 second

Moisture Resistance

1% max

Load Life

1%

Temperature Cycling

0.5%

Short Time Overload

1%

Operating temperature range is -55°C to +350°C

Note (1): Valid only if resistance value is low enough that the test voltage causes overload of 15X rated power or more.

Wave Soldering

Description

Maximum

Recommended

Minimum

Preheat Time

80 seconds

70 seconds

60 seconds

Temperature Diff.

140°C

120°C

100°C

Solder Temp.

260°C

250°C

240°C

Dwell Time at Max.

10 seconds

5 seconds

*

Ramp DN (°C/sec)

N/A

N/A

N/A

Temperature Diff. = Defference between final preheat stage and soldering stage.