PolySwitch®
PTC Devices
Overcurrent Protection Device
PRODUCT: SRP420F
DOCUMENT: SCD25985
REV LETTER: E
REV DATE: JULY 26, 2016
PAGE NO.: 1 OF 2
© 2016 Littelfuse, Inc.
Specifications are subject to change without notice. littelfuse.com
Revised July 26, 2016
Specification Status: Released
Electrical Rating
Voltage: 30V MAX
Current: 100A MAX
Chip Size: 13.1x15.9mm
Leads: Nickel 1/4H
0.125mm nominal thickness
Tape: Polyester(White)
19.5mm Width
Solder: Lead-free
Lot Marking Ink Color (Green)
Marking:
Manufacturer's Mark
420
Lot Identification
Part Identification
ORIENTATION MARK (Blue)
TABLE I. DIMENSIONS:
A
B
C
D
E
F
MIN
MAX
MIN
MAX
MIN
MAX
MIN
MAX
MIN
MAX
MIN
MAX
mm:
30.6
32.4
12.9
13.6
0.5
1.1
5.0
7.5
5.0
7.5
6.0
6.7
in*:
(1.20)
(1.28)
(0.51)
(0.54)
(0.02)
(0.04)
(0.20)
(0.30)
(0.20)
(0.30)
(0.24)
(0.26)
*Rounded off approximation
TABLE II. PERFORMANCE RATINGS: As measured in Muller Kelvin Clips Model BU-75K.
I HOLD
CURRENT TRIP LIMITS
TIME TO
TRIP
REFERENCE
RESISTANCE
ONE-HOUR
POST-TRIP
RESISTANCE
TRIPPED-
STATE
POWER
DISSIPATION
AMPS
20°C
AMPS
AT 0°C
AMPS
AT 20°C
AMPS
AT 60°C
SECONDS AT
20°C,20.0A
OHMS
AT 20°C
OHMS
AT 20°C
WATTS AT
20°C, 30V
HOLD
HOLD
TRIP
HOLD
TRIP
HOLD
TRIP
TYP
MAX
MIN
MAX
MIN
TYP
TYP
MAX
4.2
5.1
9.5
4.2
7.6
3.0
5.5
--
6
0.012
0.024
0.012
0.040
--
2.9
Agency Recognition: UL, TUV, CSA
Reference Document: PS300
Precedence: This specification takes precedence over documents referenced herein.
Effectivity: Reference documents shall be the issue in effect on the date of invitation for bid.
CAUTION: Operation beyond the rated voltage or current may result in rupture, electrical arcing or flame.
Materials Information
ROHS Compliant ELV Compliant Pb-Free
PolySwitch®
PTC Devices
Overcurrent Protection Device
PRODUCT: SRP420F
DOCUMENT: SCD25985
REV LETTER: E
REV DATE: JULY 26, 2016
PAGE NO.: 2 OF 2
© 2016 Littelfuse, Inc.
Specifications are subject to change without notice. littelfuse.com
Revised July 26, 2016
Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test
each product selected for their own applications. Littelfuse products are not designed for, and shall not be used for, any purpose
(including, without limitation, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for
surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in
personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation.
Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse
documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended
by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and
Conditions of Sale, unless otherwise agreed by Littelfuse.
