P6SMB91C Equivalent & Substitute Parts

Part Overview

The P6SMB91C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 77.8V reverse standoff voltage with 131.25V maximum clamping voltage and 4.9A peak pulse current capability in a DO-214AA (SMB) package. The part is currently obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements.

Substiute Parts

P6SMB91C

Littelfuse Inc.In Stock: 832P6SMB91C Datasheet

Current PartRFQ

P6SMB91CA

Eaton - Electronics DivisionIn Stock: 58161P6SMB91CA Datasheet

MFR RecommendedRFQ

P6SMB91CA-E3/52

Vishay General Semiconductor - Diodes DivisionIn Stock: 1487P6SMB91CA-E3/52 Datasheet

DirectRFQ

P6SMB91CA

Eaton - Electronics DivisionIn Stock: 58161P6SMB91CA Datasheet

MFR RecommendedRFQ

SMBJ70CE3/TR13

Microchip TechnologyIn Stock: 1156SMBJ70CE3/TR13 Datasheet

MFR RecommendedRFQ

TVP06B910CA-G

Comchip TechnologyIn Stock: 829TVP06B910CA-G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the P6SMB91C is determined by the following critical electrical and mechanical parameters:

• Reverse Standoff Voltage (Typ): 77.8V minimum
• Clamping Voltage (Max) @ Ipp: 125V to 131.25V range
• Peak Pulse Current (10/1000µs): 4.8A to 4.9A
• Power - Peak Pulse: 600W
• Package / Case: DO-214AA (SMB) surface mount
• Bidirectional Channels: 1
• Type: Zener

Substitute parts are grouped into two categories based on voltage specifications:

Group 1 - Direct Voltage Match (77.8V Standoff): Parts maintaining the exact 77.8V reverse standoff voltage with clamping voltages between 125V and 131.25V. These provide the closest electrical equivalence.

Group 2 - Lower Voltage Standoff (70V Standoff): Parts with reduced reverse standoff voltage (70V) but equivalent clamping voltage (125V) and peak pulse current. These represent functional alternatives where the lower standoff voltage is acceptable for the application.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute - P6SMB91CA (Eaton - Electronics Division)

The P6SMB91CA is the manufacturer-recommended substitute, maintaining identical reverse standoff voltage (77.8V) and equivalent clamping voltage (125V) with matching peak pulse current (4.9A). This part is in active production with RoHS compliance and high inventory availability (58,100 pcs). Selection of this part ensures direct electrical equivalence with the obsolete P6SMB91C.

Secondary Substitute - P6SMB91CA-E3/52 (Vishay General Semiconductor)

The P6SMB91CA-E3/52 provides equivalent performance with 77.8V reverse standoff voltage and 125V clamping voltage. This part offers extended operating temperature range (-65°C to 150°C) and ROHS3 compliance. Peak pulse current is marginally reduced to 4.8A, which remains within acceptable tolerance for most applications. Inventory availability is lower (1,417 pcs).

Alternative Substitute - SMBJ70CE3/TR13 (Microchip Technology)

The SMBJ70CE3/TR13 operates with a reduced reverse standoff voltage of 70V but maintains the same 125V clamping voltage and 4.8A peak pulse current. This part is suitable for applications where the lower standoff voltage does not compromise circuit protection requirements. Extended operating temperature range (-65°C to 150°C) and ROHS3 compliance are provided. Inventory availability is 1,088 pcs.

Supplementary Substitute - TVP06B910CA-G (Comchip Technology)

The TVP06B910CA-G is listed as a substitute option with DO-214AA (SMB) package compatibility and 600W peak pulse power rating. Detailed electrical parameters are not specified in available documentation. This part should be selected only when other substitutes are unavailable, with application-specific electrical verification required.

Frequently Asked Questions (FAQ)

Q: Can P6SMB91CA directly replace P6SMB91C without circuit modification?

A: Yes. The P6SMB91CA maintains the same 77.8V reverse standoff voltage and provides equivalent 125V clamping voltage with matching 4.9A peak pulse current. Both parts use identical DO-214AA (SMB) surface-mount packaging. Direct substitution is supported without circuit redesign.

Q: What is the difference between P6SMB91CA and P6SMB91CA-E3/52?

A: Both parts share the same 77.8V reverse standoff voltage and 125V clamping voltage. The P6SMB91CA-E3/52 offers extended operating temperature range (-65°C to 150°C versus -55°C to 150°C) and is manufactured by Vishay. Peak pulse current is 4.8A versus 4.9A. Selection depends on temperature requirements and manufacturer preference.

Q: Why is SMBJ70CE3/TR13 listed as a substitute if it has lower standoff voltage?

A: The SMBJ70CE3/TR13 maintains the critical 125V clamping voltage and 4.8A peak pulse current, providing functional protection in applications where 70V standoff voltage is acceptable. This part is suitable for circuits where the lower standoff threshold does not compromise protection requirements. Application-specific evaluation is necessary to confirm suitability.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts (P6SMB91CA, P6SMB91CA-E3/52, SMBJ70CE3/TR13, and TVP06B910CA-G) are RoHS compliant, meeting ROHS3 or equivalent standards. The original P6SMB91C is also ROHS3 compliant.

Q: What packaging options are available for substitute parts?

A: All substitute parts are supplied in DO-214AA (SMB) surface-mount packaging, matching the original P6SMB91C. Packaging options include Tape & Reel (TR) configurations for automated assembly. Verify specific packaging requirements with your supplier.

Q: Can TVP06B910CA-G be used as a direct replacement?

A: The TVP06B910CA-G shares the DO-214AA (SMB) package and 600W power rating. However, detailed electrical parameters (standoff voltage, breakdown voltage, clamping voltage, and peak pulse current) are not specified. This part should be selected only when other documented substitutes are unavailable, with electrical parameter verification required before implementation.