P6SMB91AHE3/52 Equivalent & Substitute Parts

Part Overview

The P6SMB91AHE3/52 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates in the 77.8V reverse standoff voltage range with a 125V maximum clamping voltage and 4.8A peak pulse current rating. The part is classified as discontinued at DiGi Electronics, necessitating identification of active equivalent alternatives that maintain identical electrical and mechanical specifications for continued circuit protection applications.

Key Parameters

Parameter	Value
Manufacturer	Vishay General Semiconductor - Diodes Division
Part Number	P6SMB91AHE3/52
Category	Transient Voltage Suppressors (TVS)
Type	Zener, Unidirectional
Voltage - Reverse Standoff (Typ)	77.8V
Voltage - Breakdown (Min)	86.5V
Voltage - Clamping (Max) @ Ipp	125V
Current - Peak Pulse (10/1000µs)	4.8A
Power - Peak Pulse	600W
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
Operating Temperature	-65°C ~ 150°C (TJ)
RoHS Status	ROHS3 Compliant
Grade	Automotive
Qualification	AEC-Q101

Substitute Part Grouping Explanation

Substitution eligibility for the P6SMB91AHE3/52 is determined by strict equivalence across the following critical parameters:

Voltage - Reverse Standoff (Typ): 77.8V
Voltage - Breakdown (Min): 86.5V
Voltage - Clamping (Max) @ Ipp: 125V
Current - Peak Pulse (10/1000µs): 4.8A minimum
Power - Peak Pulse: 600W minimum
Package / Case: DO-214AA, SMB
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Substitute parts are grouped into two categories: direct Vishay equivalents with identical specifications and packaging variants, and cross-manufacturer alternatives that maintain all critical electrical parameters while offering active product status and improved availability.

Parameter Comparison

Part Number	Manufacturer	VWM (Typ)	VBR (Min)	VC (Max)	Ipp (A)	Power (W)	Package	Status
P6SMB91AHE3/52	Vishay	77.8V	86.5V	125V	4.8	600	DO-214AA (SMB)	Discontinued
P6SMB91A-E3/52	Vishay	77.8V	86.5V	125V	4.8	600	DO-214AA (SMB)	Active
P6SMB91A-E3/5B	Vishay	77.8V	86.5V	125V	4.8	600	DO-214AA (SMB)	Active
P6SMB91A-M3/52	Vishay	77.8V	86.5V	125V	4.8	600	DO-214AA (SMB)	Active
P6SMB91A-M3/5B	Vishay	77.8V	86.5V	125V	4.8	600	DO-214AA (SMB)	Active
SZP6SMB91AT3G	Littelfuse	77.8V	86.5V	125V	4.8	600	DO-214AA (SMB)	Active
1KSMB91A	Taiwan Semiconductor	77.8V	86.5V	125V	8.0	1000	DO-214AA (SMB)	Active
P6SMB91A	Eaton - Electronics Division	77.8V	86.5V	125V	4.9	600	DO-214AA (SMB)	Active
SMBJP6KE91A-TP	Micro Commercial Co	77.8V	86.5V	125V	4.9	600	DO-214AA (SMBJ)	Active

Engineering Selection Recommendations

Primary Substitutes (Vishay P6SMB Series)

The P6SMB91A-E3/52, P6SMB91A-E3/5B, P6SMB91A-M3/52, and P6SMB91A-M3/5B are direct Vishay equivalents with identical electrical specifications. These parts differ only in packaging format (Tape & Reel versus Tape & Box) and are recommended as first-choice replacements. All maintain ROHS3 compliance and active product status.

Cross-Manufacturer Alternatives

SZP6SMB91AT3G (Littelfuse) and SMBJP6KE91A-TP (Micro Commercial Co) provide equivalent electrical performance with active availability. Both are ROHS3 compliant and suitable for direct substitution in surface mount applications.

Enhanced Performance Option

The 1KSMB91A (Taiwan Semiconductor) offers higher peak pulse current (8A) and power dissipation (1000W) while maintaining identical voltage specifications. This part is suitable for applications requiring additional transient energy absorption margin.

Eaton Alternative

P6SMB91A (Eaton - Electronics Division) provides equivalent voltage and power ratings with marginally higher peak pulse current (4.9A). This part is RoHS compliant and widely available.

Frequently Asked Questions (FAQ)

Q: Can P6SMB91A-E3/52 directly replace P6SMB91AHE3/52?

A: Yes. Both parts share identical electrical specifications: 77.8V reverse standoff voltage, 86.5V minimum breakdown voltage, 125V maximum clamping voltage, and 4.8A peak pulse current. The primary difference is product status; P6SMB91A-E3/52 is active while P6SMB91AHE3/52 is discontinued.

Q: What is the difference between P6SMB91A-E3/52 and P6SMB91A-M3/52?

A: Both parts have identical electrical specifications. The difference is packaging format: P6SMB91A-E3/52 is supplied in Tape & Reel (TR) format, while P6SMB91A-M3/52 is supplied in Tape & Box (TB) format. Selection depends on assembly line requirements.

Q: Can I use 1KSMB91A as a substitute?

A: Yes, with consideration for application requirements. The 1KSMB91A maintains all voltage specifications but provides higher peak pulse current (8A versus 4.8A) and power dissipation (1000W versus 600W). This represents an upgrade suitable for circuits requiring additional transient protection margin.

Q: Are all substitutes automotive-grade?

A: The original P6SMB91AHE3/52 carries automotive grade designation with AEC-Q101 qualification. SZP6SMB91AT3G (Littelfuse) also carries automotive grade and AEC-Q101 qualification. Other substitutes are general-purpose grade but maintain equivalent electrical performance and ROHS3 compliance.

Q: What packaging considerations apply to cross-manufacturer substitutes?

A: All listed substitutes use DO-214AA (SMB or SMBJ) surface mount packages with identical PCB footprints. Physical dimensions and lead configurations are compatible across all alternatives, enabling direct board-level substitution without layout modification.

Q: Is moisture sensitivity a concern when substituting?

A: All listed parts carry MSL 1 (Unlimited) moisture sensitivity level, indicating no special moisture control requirements during storage or handling. Substitution does not introduce moisture sensitivity constraints.

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