P6SMB91CAT3 Equivalent & Substitute Parts

Part Overview

The P6SMB91CAT3 is a transient voltage suppressor (TVS) diode manufactured by onsemi, designed for surface mount applications in the SMB (DO-214AA) package. This component provides 77.8V reverse standoff voltage with 125V clamping capability and 4.8A peak pulse current rating. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

P6SMB91CAT3

onsemiIn Stock: 2851P6SMB91CAT3 Datasheet

Current PartRFQ

P6SMB91CA

Eaton - Electronics DivisionIn Stock: 58161P6SMB91CA Datasheet

DirectRFQ

P6SMB91CA

Eaton - Electronics DivisionIn Stock: 58161P6SMB91CA Datasheet

DirectRFQ

1KSMB91CA

Taiwan Semiconductor CorporationIn Stock: 303741KSMB91CA Datasheet

SimilarRFQ

SMBJ70A

MDDIn Stock: 17296SMBJ70A Datasheet

SimilarRFQ

SMBJ70CA

Semtech CorporationIn Stock: 10272SMBJ70CA Datasheet

SimilarRFQ

SMBJ70CE3/TR13

Microchip TechnologyIn Stock: 1156SMBJ70CE3/TR13 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the P6SMB91CAT3 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Voltage - Reverse Standoff (Typ): 77.8V
• Voltage - Clamping (Max) @ Ipp: 125V
• Current - Peak Pulse (10/1000µs): 4.8A minimum
• Package / Case: DO-214AA, SMB (surface mount)
• Bidirectional Zener type

Direct Equivalents maintain all primary electrical specifications and differ only in manufacturer or product status (active vs. obsolete).

Similar Substitutes maintain the core voltage protection window (77.8V standoff, 125V clamp) but may vary in peak pulse current rating or operating temperature range. These parts provide functionally equivalent transient suppression within the same package form factor.

Parameter Comparison

Engineering Selection Recommendations

P6SMB91CA (Eaton - Electronics Division) is the primary direct equivalent. It maintains identical electrical specifications (77.8V standoff, 125V clamp, 4.8A-4.9A peak pulse) and identical package form factor. This part is active in production with RoHS compliance, making it the preferred replacement for obsolete P6SMB91CAT3 units. Operating temperature range is slightly reduced (-55°C vs. -65°C minimum), which is acceptable for most applications.

1KSMB91CA (Taiwan Semiconductor Corporation) provides enhanced performance with 8A peak pulse current and 1kW power dissipation capability, compared to 4.8A and 600W for the main part. This part maintains the same voltage protection window (77.8V standoff, 125V clamp) and extends operating temperature to 175°C. Selection of this part is appropriate when higher transient current capacity or extended temperature operation is required.

SMBJ70CA (Semtech Corporation) and SMBJ70A (MDD) operate at a lower reverse standoff voltage (70V vs. 77.8V) with reduced clamping voltage (113V vs. 125V). These parts are suitable only when the application circuit can tolerate lower voltage protection thresholds. Both are RoHS3 compliant and active in production.

SMBJ70CE3/TR13 (Microchip Technology) combines the lower standoff voltage of the SMBJ70 series (70V) with the 125V clamping voltage of the main part. This creates an intermediate protection profile and is active in production with RoHS3 compliance.

All substitute parts are available in the same DO-214AA (SMB) surface mount package, ensuring mechanical and thermal compatibility with existing PCB designs.

Frequently Asked Questions (FAQ)

Q: Can P6SMB91CA be used as a direct replacement for P6SMB91CAT3?

A: Yes. P6SMB91CA is a direct equivalent with identical electrical specifications and package form factor. The primary difference is manufacturer (Eaton vs. onsemi) and product status (active vs. obsolete). Operating temperature minimum is -55°C instead of -65°C, which is acceptable for most applications.

Q: What is the difference between direct equivalents and similar substitutes?

A: Direct equivalents maintain all primary electrical parameters: 77.8V reverse standoff, 125V clamping voltage, and 4.8A peak pulse current. Similar substitutes may vary in one or more of these parameters while maintaining functional transient suppression capability within the same package. Selection depends on circuit requirements.

Q: Can SMBJ70CA replace P6SMB91CAT3?

A: SMBJ70CA operates at 70V reverse standoff and 113V clamping voltage, compared to 77.8V and 125V for the main part. This part is suitable only if the application circuit can tolerate lower voltage protection thresholds. Verify circuit requirements before substitution.

Q: Are all substitute parts RoHS compliant?

A: P6SMB91CAT3 is RoHS non-compliant. All listed substitute parts are RoHS compliant (RoHS or ROHS3), making them suitable for applications requiring environmental compliance.

Q: Do all substitute parts use the same package?

A: Yes. All substitute parts use the DO-214AA (SMB) surface mount package, ensuring mechanical and thermal compatibility with existing PCB designs without layout modifications.

Q: What is the advantage of 1KSMB91CA over P6SMB91CA?

A: 1KSMB91CA provides higher peak pulse current (8A vs. 4.9A) and power dissipation (1kW vs. 600W) while maintaining the same voltage protection window. Operating temperature extends to 175°C. Selection is appropriate for applications requiring higher transient current capacity or extended temperature operation.

Q: Can substitute parts be mixed in the same design?

A: No. Use a single part number throughout a design to ensure consistent transient suppression characteristics. Mixing different voltage ratings or current capacities may result in uneven protection across circuit branches.