P6SMBJ91CA Equivalent & Substitute Parts

Part Overview

The P6SMBJ91CA is a Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose voltage clamping applications. This bidirectional Zener diode operates with a reverse standoff voltage of 77.8V and provides 125V clamping at peak pulse current. The part is classified as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. Substitute parts must maintain identical electrical performance characteristics while meeting current availability and compliance requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	77.8	V
Voltage - Breakdown (Min)	86.5	V
Voltage - Clamping (Max) @ Ipp	125	V
Current - Peak Pulse (10/1000µs)	4.9	A
Power - Peak Pulse	600	W
Package / Case	DO-214AA, SMB	-
Mounting Type	Surface Mount	-
Operating Temperature Range	-55°C ~ 150°C	TJ
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution eligibility for the P6SMBJ91CA is determined by the following critical parameters:

Electrical Equivalence Requirements:

Voltage - Reverse Standoff (Typ): 77.8V ± tolerance
Voltage - Clamping (Max) @ Ipp: 125V
Current - Peak Pulse (10/1000µs): 4.9A ± tolerance
Power - Peak Pulse: 600W

Mechanical & Environmental Requirements:

Package / Case: DO-214AA or SMB equivalent
Mounting Type: Surface Mount
Operating Temperature Range: minimum -55°C to 150°C

Compliance Requirements:

RoHS Status: ROHS3 Compliant or equivalent
Moisture Sensitivity Level: 1 (Unlimited)

Parts meeting all electrical parameters within specified tolerances and maintaining compatible packaging are classified as direct substitutes. Variations in manufacturer, product status, or temperature range extensions do not disqualify substitution when core electrical and mechanical parameters align.

Parameter Comparison

Parameter	P6SMBJ91CA (Main)	TPSMB91CA	P6SMB91CA (Eaton)	SMBJ70CE3/TR13
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Eaton - Electronics Division	Microchip Technology
Product Status	Obsolete	Active	Active	Active
Voltage - Reverse Standoff (Typ)	77.8V	77.8V	77.8V	70V
Voltage - Breakdown (Min)	86.5V	86.5V	86.5V	77.8V
Voltage - Clamping (Max) @ Ipp	125V	125V	125V	125V
Current - Peak Pulse (10/1000µs)	4.9A	4.9A	4.9A	4.8A
Power - Peak Pulse	600W	600W	600W	600W
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Operating Temperature Range	-55°C ~ 150°C	-65°C ~ 175°C	-55°C ~ 150°C	-65°C ~ 150°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant
Inventory Status	30400 Pcs	1317 Pcs	58100 Pcs	1088 Pcs

Engineering Selection Recommendations

Primary Substitutes (Full Electrical Equivalence):

TPSMB91CA and P6SMB91CA (Eaton) are direct electrical equivalents with identical reverse standoff voltage (77.8V), breakdown voltage (86.5V), clamping voltage (125V), and peak pulse current (4.9A). Both parts are in active production status. TPSMB91CA offers extended operating temperature range (-65°C ~ 175°C) and automotive-grade qualification (AEC-Q101), suitable for applications requiring enhanced thermal performance. P6SMB91CA (Eaton) maintains the original temperature specification (-55°C ~ 150°C) and is available in higher inventory quantities (58100 pcs).

Secondary Substitute (Reduced Voltage Rating):

SMBJ70CE3/TR13 (Microchip Technology) operates with a lower reverse standoff voltage of 70V and breakdown voltage of 77.8V, representing a 7.8V reduction from the main part specification. Peak pulse current is marginally lower at 4.8A versus 4.9A. This part is suitable only for applications where the lower voltage rating is acceptable and does not compromise circuit protection requirements. Extended operating temperature range (-65°C ~ 150°C) is available.

Compliance & Availability:

All substitute parts maintain ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). Selection should prioritize active production status parts (TPSMB91CA, P6SMB91CA, SMBJ70CE3/TR13) over the obsolete main part. Inventory availability is highest for P6SMB91CA (Eaton) at 58100 units.

Frequently Asked Questions (FAQ)

Q: Can TPSMB91CA replace P6SMBJ91CA in all applications?

A: Yes. TPSMB91CA is a direct electrical equivalent with identical voltage and current ratings. The extended operating temperature range (-65°C ~ 175°C) and automotive qualification (AEC-Q101) provide additional capability. Packaging is compatible (DO-214AA, SMB surface mount).

Q: What is the difference between P6SMB91CA (Eaton) and TPSMB91CA?

A: Both are electrical equivalents with 77.8V reverse standoff and 125V clamping. P6SMB91CA (Eaton) maintains the original temperature range (-55°C ~ 150°C) and has higher inventory availability (58100 pcs). TPSMB91CA offers extended temperature range (-65°C ~ 175°C) and automotive qualification.

Q: Can SMBJ70CE3/TR13 be used as a substitute?

A: SMBJ70CE3/TR13 has a lower reverse standoff voltage (70V vs. 77.8V) and reduced peak pulse current (4.8A vs. 4.9A). Substitution is only valid if the application circuit can tolerate the reduced voltage rating without compromising protection performance.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitutes (TPSMB91CA, P6SMB91CA, SMBJ70CE3/TR13) are RoHS3 compliant or RoHS compliant, meeting environmental and regulatory requirements.

Q: What packaging options are available for substitutes?

A: All substitute parts use DO-214AA (SMB) surface mount packaging, maintaining mechanical compatibility with the original P6SMBJ91CA design. Tape & Reel (TR) packaging is standard for production quantities.

Q: Which substitute has the best availability?

A: P6SMB91CA (Eaton) has the highest inventory at 58100 units. TPSMB91CA (Littelfuse) offers 1317 units with extended temperature range and automotive qualification. SMBJ70CE3/TR13 (Microchip) has 1088 units available.

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