SA7.0 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SA7.0 is a unidirectional Zener-type transient voltage suppressor diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. The device features a 7V reverse standoff voltage with a 12.6V maximum clamping voltage at peak pulse current, housed in a DO-204AC (DO-15) axial through-hole package. The SA7.0 is currently classified as obsolete, making identification of active equivalent and substitute parts essential for ongoing design support and procurement.

Substiute Parts

SA7.0

Littelfuse Inc.In Stock: 1040SA7.0 Datasheet

Current PartRFQ

SA7.0A

Taiwan Semiconductor CorporationIn Stock: 300296SA7.0A Datasheet

DirectRFQ

P5KE7.0A-BP

Micro Commercial CoIn Stock: 1037P5KE7.0A-BP Datasheet

MFR RecommendedRFQ

P6KE8V2A

Fairchild SemiconductorIn Stock: 36217P6KE8V2A Datasheet

MFR RecommendedRFQ

SA7.0A-TP

Micro Commercial CoIn Stock: 781SA7.0A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SA7.0 are qualified based on the following critical parameters that determine functional equivalence:

• Voltage - Reverse Standoff (Typ): 7V ± tolerance
• Voltage - Clamping (Max) @ Ipp: 12V to 12.6V range
• Current - Peak Pulse (10/1000µs): 41.7A to 50A range
• Power - Peak Pulse: 500W to 600W
• Mounting Type: Through Hole
• Package / Case: DO-204AC or DO-15 axial configuration
• Type: Zener unidirectional TVS diode
• Applications: General Purpose

All substitute parts listed maintain compatibility within these electrical and mechanical boundaries, ensuring direct functional replacement in circuit applications designed for the SA7.0.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: SA7.0A (Taiwan Semiconductor Corporation)

The SA7.0A is the closest functional equivalent to the obsolete SA7.0. It maintains identical reverse standoff voltage (7V), operates within the same temperature range (-55°C ~ 175°C), and is ROHS3 compliant. Peak pulse current is marginally higher at 43A versus 42.5A, and clamping voltage is slightly lower at 12V versus 12.6V, both within acceptable substitution parameters. The SA7.0A is available in active production status with substantial inventory (300,200 pcs), ensuring long-term supply continuity.

Secondary Substitute: SA7.0A-TP (Micro Commercial Co)

The SA7.0A-TP provides an alternative active-status option with identical reverse standoff voltage and peak pulse current (42.5A) matching the original SA7.0 specification. Operating temperature range and clamping voltage align with the SA7.0A. This part is suitable where the SA7.0A supply is constrained.

Alternative Substitute: P5KE7.0A-BP (Micro Commercial Co)

The P5KE7.0A-BP maintains 7V reverse standoff voltage and 500W peak pulse power rating. Peak pulse current is 41.7A, slightly lower than the SA7.0 specification. This part extends the operating temperature range to -65°C, providing enhanced low-temperature performance. Selection is appropriate for applications requiring extended temperature operation.

Extended-Performance Substitute: P6KE8V2A (Fairchild Semiconductor)

The P6KE8V2A offers higher peak pulse current (50A) and increased power dissipation (600W) compared to the SA7.0. Reverse standoff voltage is 7.02V and clamping voltage is 12.1V, both within acceptable tolerance. This part is suitable for applications requiring enhanced transient suppression capability or higher energy absorption.

Frequently Asked Questions (FAQ)

Q: Can the SA7.0A directly replace the obsolete SA7.0 in existing designs?

A: Yes. The SA7.0A maintains the same 7V reverse standoff voltage, DO-15 package configuration, and through-hole mounting. Electrical parameters fall within acceptable substitution ranges. The primary difference is slightly lower clamping voltage (12V vs. 12.6V), which is within normal design tolerance for TVS diode applications.

Q: What is the difference between SA7.0A and SA7.0A-TP?

A: Both parts share identical electrical specifications and are manufactured by Micro Commercial Co. The primary distinction is packaging: SA7.0A is supplied in Tape & Reel format, while SA7.0A-TP is supplied in bulk. Selection depends on procurement and assembly requirements.

Q: Is the P6KE8V2A suitable as a substitute if higher transient energy absorption is required?

A: Yes. The P6KE8V2A provides 50A peak pulse current and 600W power dissipation, exceeding the SA7.0 specification. Reverse standoff voltage (7.02V) and clamping voltage (12.1V) remain compatible. This part is appropriate for applications experiencing higher transient stress or requiring additional design margin.

Q: Are all substitute parts ROHS3 compliant?

A: The SA7.0A is explicitly ROHS3 compliant. Compliance status for P5KE7.0A-BP, P6KE8V2A, and SA7.0A-TP is not specified in available documentation. Verification with manufacturers is recommended if ROHS3 compliance is a procurement requirement.

Q: What is the temperature operating range difference between substitutes?

A: The SA7.0, SA7.0A, and SA7.0A-TP operate from -55°C to 175°C. The P5KE7.0A-BP extends the lower temperature limit to -65°C, providing enhanced performance in cold environments. The P6KE8V2A operating temperature range is not specified. Selection should align with application thermal requirements.

Q: Can these parts be used interchangeably in PCB designs without layout modifications?

A: Yes. All substitute parts use DO-15 axial through-hole packaging with identical lead spacing and mounting footprint. PCB layouts designed for the SA7.0 require no modification for any listed substitute part.