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Microchip Technology 1N6128AUS — Circuit Protection
Microchip Technology

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
1N6128AUS datasheet
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MOQ1 pcs
  • 100% new & originalTraceable channels only — no refurbs, no pulls, no remarked parts.
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Specifications

1N6128AUS Technical Specifications
ParameterValue
TypeZener
Mounting typeSurface 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 1N6128AUS is a Zener-type transient voltage suppressor from Microchip Technology, designed for general-purpose circuit protection. 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 62.2V standoff voltage is the maximum DC or peak AC voltage the protected line can carry without the TVS conducting — design the rail to stay below this. 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.

Sourcing and supply posture

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.