P6SMBJ91C Equivalent & Substitute Parts

Part Overview

The P6SMBJ91C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose overvoltage protection in surface-mount applications. This bidirectional Zener diode operates with a reverse standoff voltage of 77.8V and provides clamping at 131.25V with a peak pulse current rating of 4.9A. The part is classified as obsolete, necessitating identification of active equivalent components that maintain electrical and mechanical compatibility for ongoing production and field replacement requirements.

Key Parameters

Parameter	Value
Reverse Standoff Voltage (Typ)	77.8V
Breakdown Voltage (Min)	81.9V
Clamping Voltage (Max) @ Ipp	131.25V
Peak Pulse Current (10/1000µs)	4.9A
Peak Pulse Power	600W
Operating Temperature Range	-55°C to 150°C (TJ)
Mounting Type	Surface Mount
Package	DO-214AA (SMB)
Bidirectional Channels	1
Type	Zener

Substitute Part Grouping Explanation

Substitution of the P6SMBJ91C is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

Reverse standoff voltage within the specified range (77.8V nominal)
Clamping voltage at rated peak pulse current not exceeding 131.25V
Peak pulse current capability of 4.9A minimum
Peak pulse power rating of 600W
Operating temperature range encompassing -55°C to 150°C

Mechanical Compatibility Criteria:

Surface-mount package type (DO-214AA/SMB form factor)
Bidirectional Zener diode configuration
Single-channel topology

The substitute parts listed below satisfy these parameters and are classified as active products with current manufacturing status and inventory availability.

Parameter Comparison

Parameter	P6SMBJ91C (Littelfuse)	P6SMB91CA (Eaton)	SMBJ70CE3/TR13 (Microchip)
Manufacturer	Littelfuse	Eaton - Electronics Division	Microchip Technology
Product Status	Obsolete	Active	Active
Reverse Standoff Voltage (Typ)	77.8V	77.8V	70V
Breakdown Voltage (Min)	81.9V	86.5V	77.8V
Clamping Voltage (Max) @ Ipp	131.25V	125V	125V
Peak Pulse Current (10/1000µs)	4.9A	4.9A	4.8A
Peak Pulse Power	600W	600W	600W
Operating Temperature Range	-55°C to 150°C	-55°C to 150°C	-65°C to 150°C
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

P6SMB91CA (Eaton - Electronics Division) is the primary substitute for the P6SMBJ91C. This part maintains identical reverse standoff voltage (77.8V), peak pulse current (4.9A), and operating temperature range (-55°C to 150°C). The clamping voltage is reduced to 125V, which is within acceptable tolerance for the application. The part is active with high inventory availability (58,100 pcs) and carries RoHS compliance certification. Packaging is supplied in Tape & Reel format.

SMBJ70CE3/TR13 (Microchip Technology) serves as an alternative substitute with active product status and ROHS3 compliance. This part operates at a lower reverse standoff voltage of 70V with a minimum breakdown voltage of 77.8V. The clamping voltage matches the primary substitute at 125V, and peak pulse current is rated at 4.8A. The extended operating temperature range (-65°C to 150°C) provides additional thermal margin. This option is suitable for applications where the lower standoff voltage is acceptable within the circuit design parameters.

Both substitutes are surface-mount components in DO-214AA/SMB packages with identical mechanical compatibility and moisture sensitivity ratings (MSL 1). Selection between these options depends on the specific voltage requirements of the target application.

Frequently Asked Questions (FAQ)

Q: Can P6SMB91CA directly replace P6SMBJ91C in existing designs?

A: Yes. The P6SMB91CA maintains the same reverse standoff voltage (77.8V), peak pulse current (4.9A), and operating temperature range. The clamping voltage reduction from 131.25V to 125V is within normal design tolerance for TVS diode applications. Both parts use identical DO-214AA/SMB surface-mount packaging.

Q: What is the voltage difference between P6SMB91CA and SMBJ70CE3/TR13?

A: The P6SMB91CA operates at 77.8V reverse standoff voltage, matching the original P6SMBJ91C. The SMBJ70CE3/TR13 operates at a lower 70V reverse standoff voltage. Selection depends on whether the circuit requires the higher voltage threshold. Both clamp at 125V.

Q: Are all three parts RoHS compliant?

A: Yes. The P6SMBJ91C and SMBJ70CE3/TR13 are ROHS3 compliant. The P6SMB91CA is RoHS compliant. All three meet environmental compliance requirements for current manufacturing standards.

Q: What is the difference in packaging between these parts?

A: All three parts use the same DO-214AA/SMB surface-mount package form factor. The P6SMB91CA is supplied in Tape & Reel (TR) format, while the SMBJ70CE3/TR13 is also supplied in Tape & Reel. Packaging format does not affect electrical or mechanical compatibility.

Q: Can SMBJ70CE3/TR13 be used in applications requiring 77.8V standoff voltage?

A: No. The SMBJ70CE3/TR13 operates at 70V reverse standoff voltage, which is lower than the original specification. This part is suitable only for applications where the lower voltage threshold is acceptable within the circuit design.

Q: What is the peak pulse current difference between these parts?

A: The P6SMBJ91C and P6SMB91CA are both rated at 4.9A peak pulse current. The SMBJ70CE3/TR13 is rated at 4.8A, a negligible difference of 0.1A that does not affect practical application compatibility.

Q: Are moisture sensitivity levels identical across all three parts?

A: Yes. All three parts carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions for storage, handling, or reflow processes.

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