SA70CA Equivalent & Substitute Parts

Part Overview

The SA70CA is a transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in through-hole applications. This component features a 70V reverse standoff voltage with 113V maximum clamping voltage and 4.4A peak pulse current capability in a DO-15 package. The SA70CA is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	70V
Voltage - Breakdown (Min)	77.8V
Voltage - Clamping (Max) @ Ipp	113V
Current - Peak Pulse (10/1000µs)	4.4A
Power - Peak Pulse	500W
Type	Zener
Bidirectional Channels	1
Mounting Type	Through Hole
Package / Case	DO-204AC, DO-15, Axial
Applications	General Purpose

Substitute Part Grouping Explanation

Substitute parts for the SA70CA are classified into two categories based on electrical and mechanical compatibility:

Direct Equivalents maintain identical electrical specifications (70V standoff, 77.8V breakdown minimum, 113V clamping maximum, 4.4A peak pulse current) and package configuration (DO-15/DO-204AC through-hole). These parts are functionally interchangeable with the original SA70CA.

Similar Alternatives share the same voltage ratings and clamping characteristics but may differ in peak pulse current capability (4.5A to 5.3A) or power dissipation (500W to 600W). These parts provide equivalent overvoltage protection performance within the specified voltage window and are suitable for applications where the original part is unavailable.

Substitution eligibility is determined by:

Voltage - Reverse Standoff: 70V ± tolerance
Voltage - Clamping (Max) @ Ipp: 113V
Mounting Type: Through Hole
Package / Case: DO-15 or DO-204AC

Parameter Comparison

Part Number	Manufacturer	Status	Standoff (V)	Breakdown Min (V)	Clamp Max (V)	Peak Pulse (A)	Power (W)	Package	Temp Range
SA70CA	onsemi	Obsolete	70	77.8	113	4.4	500	DO-15	-
SA70CA	Taiwan Semiconductor Corporation	Active	70	77.8	113	4.6	500	DO-204AC	-55°C ~ 175°C
SA70CA-E3/54	Vishay General Semiconductor - Diodes Division	Active	70	77.8	113	4.4	500	DO-204AC	-55°C ~ 175°C
SA70CAHE3/54	Vishay General Semiconductor - Diodes Division	Active	70	77.8	113	4.4	500	DO-204AC	-55°C ~ 175°C
P5KE70CA-AP	Micro Commercial Co	Active	70	77.8	113	4.4	500	DO-15	-65°C ~ 175°C
P5KE70CA-BP	Micro Commercial Co	Active	70	77.8	113	4.4	500	DO-15	-65°C ~ 175°C
P5KE70CA-TP	Micro Commercial Co	Active	70	77.8	113	4.4	500	DO-15	-65°C ~ 175°C
P6KE82CA	Taiwan Semiconductor Corporation	Active	70.1	77.9	113	5.3	600	DO-15	-
SA70CA-AP	Micro Commercial Co	Active	70	77.8	113	4.5	500	DO-15	-55°C ~ 175°C
SA70CA-BP	Micro Commercial Co	Active	70	77.8	113	4.5	500	DO-15	-55°C ~ 175°C
SA70CA-TP	Micro Commercial Co	Active	70	77.8	113	4.5	500	DO-15	-55°C ~ 175°C

Engineering Selection Recommendations

Direct Replacement Priority:

For applications requiring exact electrical and mechanical compatibility, select from active-status parts with identical specifications:

SA70CA (Taiwan Semiconductor Corporation) - Direct equivalent with active product status and specified operating temperature range
SA70CA-E3/54 (Vishay) - Direct equivalent with TransZorb series designation and active status
SA70CAHE3/54 (Vishay) - Direct equivalent with automotive-grade qualification (AEC-Q101) for temperature-critical applications

General-Purpose Substitution:

The P5KE70CA series (Micro Commercial Co) variants (P5KE70CA-AP, P5KE70CA-BP, P5KE70CA-TP) provide identical electrical performance with extended temperature range (-65°C to 175°C) and active product status. These are suitable for applications where the original onsemi part is unavailable.

The SA70CA variants from Micro Commercial Co (SA70CA-AP, SA70CA-BP, SA70CA-TP) offer marginally higher peak pulse current (4.5A versus 4.4A) while maintaining all other electrical parameters and active product status.

Higher Current Capability Alternative:

The P6KE82CA (Taiwan Semiconductor Corporation) provides increased peak pulse current (5.3A) and power dissipation (600W) with nearly identical voltage characteristics (70.1V standoff, 77.9V breakdown minimum, 113V clamping maximum). This part is suitable for applications requiring enhanced transient energy absorption capacity.

Compliance Considerations:

All substitute parts maintain REACH compliance and EAR99 export classification consistent with the original SA70CA. The SA70CAHE3/54 variant includes AEC-Q101 automotive qualification for applications requiring automotive-grade reliability.

Frequently Asked Questions (FAQ)

Q: Can I use SA70CA-E3/54 or SA70CAHE3/54 as a direct replacement for the obsolete onsemi SA70CA?

A: Yes. Both Vishay parts maintain identical electrical specifications (70V standoff, 113V clamping, 4.4A peak pulse) and DO-15 package configuration. The SA70CAHE3/54 includes automotive-grade qualification (AEC-Q101) if your application requires this certification.

Q: What is the difference between the P5KE70CA and SA70CA variants from Micro Commercial Co?

A: Both series share identical voltage ratings and clamping characteristics. The P5KE70CA series is designated as a general interface component, while SA70CA variants maintain the original part number designation. Peak pulse current differs slightly (P5KE70CA: 4.4A, SA70CA variants: 4.5A). Both are active products with extended temperature range (-65°C to 175°C).

Q: Is the P6KE82CA suitable as a substitute for the SA70CA?

A: The P6KE82CA is electrically compatible within the voltage window (70.1V standoff, 113V clamping) but provides higher peak pulse current (5.3A versus 4.4A) and power dissipation (600W versus 500W). This part is suitable for applications requiring enhanced transient protection capacity. The slightly higher standoff voltage (70.1V versus 70V) remains within acceptable tolerance for general-purpose overvoltage suppression.

Q: Does packaging differ between substitute options?

A: All substitute parts use through-hole axial packages (DO-15 or DO-204AC equivalent). The Taiwan Semiconductor Corporation SA70CA is supplied in DO-204AC packaging, while Micro Commercial Co variants and the P6KE82CA use DO-15 packaging. Both package designations are mechanically and electrically equivalent for through-hole PCB applications.

Q: Which substitute part offers the best long-term availability?

A: The P6KE82CA from Taiwan Semiconductor Corporation shows the highest current inventory (16,750 pcs) and active product status. The SA70CA from Taiwan Semiconductor Corporation and Vishay variants (SA70CA-E3/54, SA70CAHE3/54) also maintain active status with substantial inventory levels (946–1,087 pcs).

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