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Bourns Inc. 1.5SMC91A-Q — Circuit Protection
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Bourns Inc. / Circuit Protection

Bourns 1.5SMC91A-Q TVS Diode, 77.8V Standoff, 162.5V Clamp

MPN 1.5SMC91A-Q
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Bourns 1.5SMC91A-Q, Automotive AEC-Q101 unidirectional TVS Zener, 77.8V standoff, 86.5V min breakdown, 162.5V clamping @ 61A peak pulse, 1500W peak pulse power, DO-214AB SMC surface mount, -55°C to +150°C junction.

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Full Technical Specifications

14 Parameters
1.5SMC91A-Q specifications
Parameter / AttributeSpecification / Value
TypeZener
SeriesAutomotive, AEC-Q101, 1.5SMC-Q
MountingSurface Mount
Voltage - breakdown86.5V
Voltage - clamping (Max) @ ipp162.5V
Voltage - reverse standoff77.8V
Current - peak pulse (10/1000μs)61A (8/20µs)
Power - peak pulse1500W (1.5kW)
Power line protectionNo
Operating temperature-55°C~150°C(TJ)
PackageTape & Reel (TR)
ApplicationsAutomotive
CaseDO-214AB, SMC
Unidirectional channels1
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Technical Details & Description

What the three-voltage spec actually tells you

The 1.5SMC91A-Q: The 77.8V reverse standoff is the working rail the diode ignores — it sits off and draws only leakage current up to that level. That ~2.1:1 ratio between standoff and clamping is the let-through ceiling — tight enough for most 77V-rail protection targets in automotive and industrial DC distribution.

Surge energy and peak pulse power

The 61A peak pulse rating at the clamping voltage sets the surge current the diode survives without degradation per the AEC-Q101 test sequence; exceed that current and the clamping voltage rises above spec, so the board-level surge budget must stay within it.

Automotive qualification and temperature grade

The DO-214AB SMC package is the industry-standard TVS footprint; land pattern tolerance is forgiving and dual-source availability from multiple TVS manufacturers is strong for this case size.

Frequently asked questions

What series and qualification does the 1.5SMC91A-Q carry?

It belongs to the 1.5SMC-Q series with AEC-Q101 automotive qualification — the suffix Q denotes automotive grade per Bourns convention. This is the series to cross-reference if you are sourcing an automotive-grade unidirectional TVS in the DO-214AB SMC package.

1.5SMC91A-Q
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