Selected devices can survive demanding repetitive short-circuit tests, but a production BOM still depends on thermal design, capacitive and inductive loads, diagnostics and field support.
Halo Microelectronics publicized a one-million-event short-circuit result for HL85416 in 2026. The figure attracted attention because repetitive fault survival matters in automotive distribution. It should be interpreted as evidence under a defined qualification method, not as a universal lifetime promise.
Comparable test objectives exist across the automotive industry. The differentiator begins after the headline.
AEC-Q100-012 defines short-circuit reliability testing for smart power devices, but results depend on voltage, impedance, pulse duration, temperature, cooling and sample plan. A million cycles under one condition do not authorize a different load and PCB.
Ask for the test report, device revision and pass criteria. Confirm whether fault counters, diagnostics and channel resistance remained within limits, not merely whether the device still switched.
This turns a marketing number into reviewable qualification evidence.
HL85416, Texas Instruments TPS1H100-Q1, NOVOSENSE NSE34140D and Southchip SC77450CQ are not interchangeable because all are called high-side switches. Channel count, on-resistance, clamp energy, current-limit accuracy, retry strategy and diagnostic interface vary.
Capacitive loads stress startup and retry logic. Inductive loads stress the clamp. A harness short at high ambient temperature stresses both silicon and board copper.
Use the real load envelope and failure response to make the shortlist.
Integrated MOSFET capability is limited by package and thermal path. Copper area, vias, neighboring heat sources and enclosure temperature determine junction temperature during normal and fault operation.
Test worst-case battery, component tolerance and cooling. Measure current limiting, thermal cycling, diagnostic timing and recovery. Review how repeated faults affect connector, trace and fuse behavior as well as the IC.
The device cannot protect a layout that prevents it from shedding heat.
Automotive programs need stable process control, traceability, PCN terms and a failure-analysis path. A supplier must explain anomalous lots years after launch, not only deliver a successful sample.
Procurement should assess approved factories, package capacity and support ownership. Engineering should preserve the exact test configuration so a later silicon or assembly change can be evaluated consistently.
The release record should connect each load to its current limit, clamp-energy calculation, thermal model, diagnostic thresholds and vehicle software behavior. Incoming inspection and end-of-line tests then need to detect the faults the architecture assumes will be visible. Without that chain, a capable protection IC can still enter production with the wrong settings or inadequate board cooling.
One million short-circuit events can demonstrate that a device has entered a demanding class of automotive protection. It does not settle the selection.
The production decision requires load-specific electrical and thermal evidence, diagnostic behavior and a credible long-term support system. Replacing a fuse or relay transfers protection responsibility into silicon; the validation plan must move with it.
This analysis concerns information available in August 2026 and is not a current product recommendation.
Part numbers named in the piece. China-based parts are marked — those are the ones a buyer is looking for when qualifying a second source.
| Part number | Supplier | Origin |
|---|---|---|
| SC77450CQ | Southchip | China-based |
| HL85416 | Halo Microelectronics | China-based |
| TPS1H100-Q1 | Texas Instruments | International |
| NSE34140D | NOVOSENSE | China-based |
