Rev Date: 6/28/2022

9

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

CSRF Series

Foil on Ceramic Current Sensing Chip Resistor

Stackpole Electronics, Inc.

Resistive Product Solutions

Soldering Recommendations:

•

Peak reflow temperatures and durations:

o

IR Reflow Peak = 260°C max for 10 seconds

o

Wave Solder = 260°C max for 10 seconds

•

Compatible with lead and lead-free solder reflow process

•

Recommended IR Reflow Profile:

High Power Chip Resistors and Thermal Management

Stackpole has developed several surface mount resistor series in addition to our current sense resistors, which have had

higher power ratings than standard resistor chips. This has caused some uncertainty and even confusion by users as to

how to reliably use these resistors at the higher power ratings in their designs.

The data sheets for the RHC, RMCP, RNCP, CSR, CSRN, CSRF, CSS, and CSSH state that the rated power assumes

an ambient temperature of no more than 100ºC for the CSS / CSSH series and 70ºC for all other high power resistor

series. In addition, IPC and UL best practices dictate that the combined temperature on any resistor due to power

dissipated and ambient air shall be no more than 105ºC

. At first glance this wouldn’t seem too difficult, however the graph

below shows typical heat rise for the CSR1206 100 milliohm at full rated power. The heat rise for the RMCP and RNCP

would be similar. The RHC with its unique materials, design, and processes would have less heat rise and therefore

would be easier to implement for any given customer.

Recommended Pad Layouts

– CSRF-HP

Size

a

b

c

Unit

0.008

0.031

0.024

inches

0.20

0.80

0.60

mm

CSRF0603…-HP

0.024

0.035

0.039

inches

0.005 Ω - 0.009 Ω

0.60

0.90

1.00

mm

CSRF0603…-HP

0.035

0.028

0.039

inches

0.01 Ω - 0.03 Ω

0.90

0.70

1.00

mm

0.047

0.047

0.055

inches

1.20

1.20

1.40

mm

CSRF0402…-HP

CSRF0805…-HP