Battery Mini-Breaker for Tablet Battery Protection

Question

Problem: Battery Mini-Breaker for Tablet Battery Protection. Solve this hands-on electronics task on EWskills.

Accepted Answer

1. Component Purpose

Li-Polymer batteries can enter thermal runaway if overheated — a dangerous chain reaction where temperature rises uncontrollably, leading to fire or explosion.

A battery mini-breaker (MHP) is a resettable thermal cutoff mounted directly on the cell. When the cell temperature reaches the trip point (85°C), the breaker opens and disconnects the cell. When the temperature drops, it resets automatically — unlike a one-shot thermal fuse which must be replaced.

Required: Breaker · 85°C trip · ≥9VDC · ≥12A · Active · Littelfuse · RoHS

Battery-Mini-Breaker-for-Tablet-Battery-Protection

2. How to Find It on DigiKey

Go to DigiKey.com → Circuit Protection → Thermal Cutoffs (Thermal Fuses)

Apply these filters:

Type → Breaker
Rated Functioning Temperature → 85°C
Current Rating (Amps) → 12A or higher
Manufacturer → Littelfuse Inc.
Part Status → Active

Tip: The Littelfuse MHP-TAM series is specifically designed for battery protection. "Breaker" type means resettable — it is NOT a one-shot thermal fuse.

3. Key Specifications & What They Mean

Specification	Required	Why
Type	Breaker	Resettable; resets when temp drops.
Trip Temperature	85°C	Protects before thermal runaway onset.
Voltage Rating	≥9VDC	2S pack max = 8.4V; 9V covers it.
Current Rating	≥12A	Peak 8A + derating margin.
Part Status	Active	Must be currently manufactured.
Manufacturer	Littelfuse	Company AVL requirement.
RoHS	Yes	Compliance required.

4. Selecting a Safe, Production-Ready Part

The filtered list will show matching parts. Before you pick one, check: Is it Active? Is stock available? Is the manufacturer reputable? Is a datasheet available?

Full checklist: How to Select a Safe, Production-Ready Component — EWskills Guide

5. Filtered DigiKey Link

➡ View Matching Parts — Littelfuse, Breaker, 85°C, ≥12A, ≥9VDC

37. Battery Mini-Breaker for Tablet Battery Protection