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Microchip Technology 1N6128AUS — Circuit Protection

1N6128AUS Zener TVS Diode – 500W, Bidirectional, SQ-MELF

MPN1N6128AUS
Active

Microchip Technology 1N6128AUS, Zener TVS diode, 500W peak pulse power, bidirectional, 62.2V reverse standoff, SQ-MELF B surface-mount package, active production.

$15.0750Ref. price · indicative, final on quote
Microchip Technology 1N6128AUS datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

1N6128AUS specifications
ParameterValue
TypeZener
MountingSurface Mount
Voltage - breakdown77.9V
Voltage - clamping (Max) @ ipp112.8V
Voltage - reverse standoff62.2V
Current - peak pulse (10/1000μs)4.4A
Power - peak pulse500W
Power line protectionNo
Operating temperature-55°C~175°C(TJ)
PackageBulk
ApplicationsGeneral Purpose
CaseSQ-MELF, B
Bidirectional channels1

Product details

Active Zener TVS in a compact surface-mount package

The 77.9V minimum breakdown voltage sets the trigger threshold — the device starts conducting just above that level. A single bidirectional channel means it protects both polarities on a line, useful for AC-coupled signals or data pairs where the transient can swing either way.

Parametric fit for your protection window

The 112.8V clamping voltage at 4.4A peak pulse current defines the worst-case voltage the downstream circuitry sees during a surge. The SQ-MELF B package is a surface-mount ceramic body with good solder-joint reliability and a small footprint — no through-hole hole drilling needed.

The base product number is 1N6128, and the 'AUS' suffix indicates the surface-mount SQ-MELF variant. The package is Bulk, so orders come in tube or tray quantities rather than tape-and-reel.

Frequently asked questions

What is the peak pulse power of the 1N6128AUS?

500W peak pulse power measured with a 10/1000 µs waveform. This rating tells you the energy the device can absorb in a single surge event — enough for typical industrial transient protection on 48V or 60V rails.

Is the 1N6128AUS bidirectional?

Yes, it has a single bidirectional channel. That means it clamps both positive and negative transients on the same line — no need to orient the device or use two unidirectional parts back-to-back.

Can the 1N6128AUS replace the 1N6128?

The 1N6128AUS is the surface-mount SQ-MELF version of the base 1N6128. The electrical specs — breakdown, clamping, standoff — are the same. The difference is the package: the 'AUS' suffix means SQ-MELF for SMD assembly, while the base 1N6128 is typically a through-hole package. If your board is laid out for a surface-mount footprint, the 1N6128AUS is the direct fit.