MICROSMD350LR-D-2

$0.73

Description：PTC RESET FUSE 6V 3.5A 1206
Series：PolySwitch®, microSMD
Mfr：Littelfuse Inc.
Package：Tape & Reel (TR),Cut Tape (CT)

SKU:36237952e14b Category: PTC Resettable Fuses Brand: Littelfuse Inc.

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Product introduction

Product Detailed Parameters

Description：PTC RESET FUSE 6V 3.5A 1206
Series：PolySwitch®, microSMD
Mfr：Littelfuse Inc.
Package：Tape & Reel (TR),Cut Tape (CT)
Type：Polymeric
Voltage - Max：6V
Current - Hold (Ih) (Max)：3.5 A
Current - Trip (It)：9:00 AM
Current - Max：50 A
Time to Trip：10 s
Resistance - Initial (Ri) (Min)：2.5 mOhms
Resistance - Post Trip (R1) (Max)：11 mOhms
Resistance - 25°C (Typ)：-
Operating Temperature：-40°C ~ 80°C
Grade：-
Qualification：-
Ratings：-
Mounting Type：Surface Mount
Package / Case：1210 (3225 Metric)
Size / Dimension：0.127" L x 0.102" W (3.22mm x 2.58mm)
Height - Seated (Max)：-
Thickness (Max)：0.039" (1.00mm)
Lead Spacing：-

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MICROSMD350LR-D-2

Overview

The MICROSMD350LR-D-2 is a surface-mount PTC resettable fuse from the microSMD series, rated for a maximum voltage of 6V DC. It features a hold current (Ih) of 3.5A and a trip current (It) of 9A. The device can withstand a maximum fault current of 50A. Initial resistance is specified at a minimum of 2.5 mOhms. It operates within a temperature range of -40°C to +85°C and utilizes a 1210 (3225 Metric) package.

Feature Summary

Provides overcurrent protection through automatic reset functionality upon cooling after fault removal
Designed for low-profile surface mount integration in compact electronic assemblies
Complies with UL and CSA safety standards for circuit protection applications

Applications

Portable consumer electronics requiring low-voltage circuit protection
Battery-powered devices needing high-current surge handling
USB peripheral interfaces and data line protection

Procurement Notes

Verify component authenticity by checking manufacturer markings against official datasheet specifications. Confirm package dimensions and terminal finish match the 1210 form factor. Ensure storage conditions respect moisture sensitivity levels prior to soldering. Validate that the selected variant meets specific regulatory requirements for the target market.

Selection Notes

Select this component when the application demands a 6V rating with a 3.5A continuous operating current. Consider the 50A maximum interrupting capacity for robust fault tolerance. Evaluate the low initial resistance for minimal voltage drop impact. Ensure the thermal environment remains within the specified operational temperature limits.

Part Context

This part belongs to Littelfuse's microSMD family of PolySwitch resettable fuses. It represents a surface-mount alternative to traditional axial lead components. The series is engineered for automated assembly processes. It offers a balance of electrical performance and physical footprint suitable for modern PCB designs.