MF-S420 is out of stock and can be placed on backorder.
Available Substitutes:

Direct


Littelfuse Inc.
In Stock: 0
Unit Price: $1.01000
Datasheet

Similar


Littelfuse Inc.
In Stock: 0
Unit Price: $0.85000
Datasheet
Polymeric PTC Resettable Fuse 30V 4.2 A Ih User Defined Strap
Image shown is a representation only. Exact specifications should be obtained from the product data sheet.
Polymeric PTC Resettable Fuse 30V 4.2 A Ih User Defined Strap
Basics of NTC and PTC Thermistors - Another Teaching Moment

MF-S420

DigiKey Part Number
MF-S420-ND
Manufacturer
Manufacturer Product Number
MF-S420
Description
PTC RESET FUSE 30V 4.2A STRAP
Manufacturer Standard Lead Time
14 Weeks
Customer Reference
Detailed Description
Polymeric PTC Resettable Fuse 30V 4.2 A Ih User Defined Strap
Datasheet
 Datasheet
EDA/CAD Models
MF-S420 Models
Product Attributes
Filter Similar Products
Show Empty Attributes
Category
Time to Trip
6 s
Manufacturer
Bourns Inc.
Resistance - Initial (Ri) (Min)
12 mOhms
Series
Resistance - Post Trip (R1) (Max)
40 mOhms
Packaging
Bulk
Operating Temperature
-40°C ~ 85°C
Part Status
Active
Mounting Type
User Defined
Type
Polymeric
Package / Case
Strap
Voltage - Max
30V
Size / Dimension
1.240" L x 0.522" W (31.50mm x 13.25mm)
Current - Hold (Ih) (Max)
4.2 A
Thickness (Max)
0.043" (1.10mm)
Current - Trip (It)
7.6 A
Approval Agency
cURus, TUV
Current - Max
100 A
Base Product Number
Environmental & Export Classifications
Product Questions and Answers
Additional Resources
Substitutes (2)
Part NumberManufacturerQuantity AvailableDigiKey Part NumberUnit PriceSubstitute Type
SRP420FLittelfuse Inc.0SRP420F-ND$1.01000Direct
SRP350FLittelfuse Inc.0SRP350F-ND$0.85000Similar
In-Stock: 0
500 estimated in stock on 05-Mar-2027
Request Stock Notification
Non-Cancelable/Non-Returnable
All prices are in USD
Bulk
QuantityUnit PriceExt Price
1$0.71000$0.71
5$0.59000$2.95
10$0.54400$5.44
50$0.45140$22.57
100$0.41650$41.65
250$0.37444$93.61
500$0.34536$172.68
1,000$0.31843$318.43
5,000$0.26326$1,316.30
Tariff Status: Tariff may apply if shipping to the United States. Estimated tariff costs will be calculated and displayed in the shopping cart to help you assess potential expenses.