SA75CA Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SA75CA is a 75V Zener transient voltage suppressor diode in DO-15 axial package configuration, designed for general-purpose overvoltage protection applications. Manufactured by onsemi, this component features a 121V maximum clamping voltage and 4.1A peak pulse current rating with 500W peak pulse power dissipation capability. The SA75CA is classified as obsolete, necessitating identification of active equivalent and substitute parts that maintain electrical and mechanical compatibility for ongoing design support and production requirements.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	75V
Voltage - Breakdown (Min)	83.3V
Voltage - Clamping (Max) @ Ipp	121V
Current - Peak Pulse (10/1000µs)	4.1A
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 SA75CA are classified based on strict electrical parameter equivalence and mechanical compatibility. The primary substitution criteria are:

Critical Matching Parameters:

Voltage - Reverse Standoff (Typ): 75V
Voltage - Breakdown (Min): 83.3V
Voltage - Clamping (Max) @ Ipp: 121V
Current - Peak Pulse (10/1000µs): 4.1A to 4.3A (within tolerance band)
Power - Peak Pulse: 500W
Type: Zener, Bidirectional, Single Channel
Mounting Type: Through Hole
Package / Case: DO-204AC or DO-15 Axial

Direct Equivalents maintain identical electrical specifications and active product status from alternative manufacturers. Similar Substitutes provide equivalent voltage and power ratings with minor variations in peak pulse current (4.2A) or temperature operating range, suitable for general-purpose applications where these variations remain within system design margins.

Parameter Comparison

Part Number	Manufacturer	Status	Vwm (Typ)	Vb (Min)	Vc (Max)	Ipp (A)	Pkg	Temp Range
SA75CA	onsemi	Obsolete	75V	83.3V	121V	4.1A	DO-15	-
SA75CA	Taiwan Semiconductor Corporation	Active	75V	83.3V	121V	4.3A	DO-204AC	-55°C ~ 175°C
SA75CA-E3/54	Vishay General Semiconductor	Active	75V	83.3V	121V	4.1A	DO-204AC	-55°C ~ 175°C
SA75CAHE3/54	Vishay General Semiconductor	Active	75V	83.3V	121V	4.1A	DO-204AC	-55°C ~ 175°C
P5KE75CA-AP	Micro Commercial Co	Active	75V	83.3V	121V	4.1A	DO-15	-65°C ~ 175°C
P5KE75CA-BP	Micro Commercial Co	Active	75V	83.3V	121V	4.1A	DO-15	-65°C ~ 175°C
P5KE75CA-TP	Micro Commercial Co	Active	75V	83.3V	121V	4.1A	DO-15	-65°C ~ 175°C
SA75CA-AP	Micro Commercial Co	Active	75V	83.3V	121V	4.2A	DO-15	-55°C ~ 175°C
SA75CA-BP	Micro Commercial Co	Active	75V	83.3V	121V	4.2A	DO-15	-55°C ~ 175°C
SA75CA-TP	Micro Commercial Co	Active	75V	83.3V	121V	4.2A	DO-15	-55°C ~ 175°C

Engineering Selection Recommendations

Direct Equivalents (Preferred for Drop-In Replacement):

The SA75CA from Taiwan Semiconductor Corporation and SA75CA-E3/54 from Vishay General Semiconductor (TransZorb® series) are direct electrical equivalents with active product status. Both maintain the 75V standoff voltage, 121V clamping voltage, and 500W peak pulse power rating. The Taiwan Semiconductor version offers 4.3A peak pulse current, providing additional margin. Vishay's SA75CA-E3/54 maintains 4.1A specification with ROHS3 compliance.

For automotive applications requiring AEC-Q101 qualification, the SA75CAHE3/54 from Vishay provides identical electrical specifications with automotive-grade certification and active status.

Alternative Substitutes (Functionally Equivalent):

The P5KE75CA series (P5KE75CA-AP, P5KE75CA-BP, P5KE75CA-TP) from Micro Commercial Co provides equivalent voltage protection with identical 4.1A peak pulse current and extended temperature range (-65°C to 175°C). These parts maintain DO-15 package compatibility and active product status.

The SA75CA variants (SA75CA-AP, SA75CA-BP, SA75CA-TP) from Micro Commercial Co offer 4.2A peak pulse current with DO-15 package compatibility and active status, suitable for applications where the minor current increase remains within design margins.

Compliance Considerations:

All active substitute parts maintain REACH Unaffected status and EAR99 ECCN classification consistent with the original SA75CA. Vishay parts carry ROHS3 compliance certification. Moisture sensitivity level remains 1 (Unlimited) across all equivalents.

Frequently Asked Questions (FAQ)

Q: Can I directly replace an obsolete onsemi SA75CA with the Taiwan Semiconductor Corporation SA75CA?

A: Yes. Both parts maintain identical voltage specifications (75V standoff, 121V clamping) and 500W peak pulse power rating. The Taiwan Semiconductor version provides 4.3A peak pulse current versus the original 4.1A, offering additional safety margin. Both use DO-15 axial package configuration.

Q: What is the difference between SA75CA-E3/54 and SA75CAHE3/54 from Vishay?

A: Both are Vishay TransZorb® series parts with identical electrical specifications (75V standoff, 121V clamping, 4.1A peak pulse). The SA75CAHE3/54 includes AEC-Q101 automotive qualification and is designated for automotive-grade applications. Both are active products with ROHS3 compliance.

Q: Are P5KE75CA and SA75CA parts interchangeable?

A: Yes, for general-purpose applications. Both maintain 75V standoff voltage, 121V clamping voltage, and 4.1A peak pulse current. The P5KE75CA series offers extended temperature range (-65°C to 175°C) compared to standard -55°C to 175°C. Both use DO-15 package and are active products from Micro Commercial Co.

Q: What is the significance of the suffix letters (AP, BP, TP) in Micro Commercial Co part numbers?

A: The suffix letters indicate different packaging or tape configurations within the same electrical specification. All three variants (AP, BP, TP) maintain identical electrical parameters: 75V standoff, 121V clamping, and either 4.1A or 4.2A peak pulse current depending on the base part number (P5KE75CA or SA75CA).

Q: Can I use SA75CA-AP with 4.2A peak pulse current in place of the original 4.1A specification?

A: Yes. The 4.2A peak pulse current represents a 2.4% increase within normal manufacturing tolerance bands for TVS diodes. This variation remains within acceptable design margins for general-purpose overvoltage protection applications where the original 4.1A specification was used.

Q: Are all substitute parts RoHS compliant?

A: Vishay parts (SA75CA-E3/54, SA75CAHE3/54) carry explicit ROHS3 compliance certification. Micro Commercial Co and Taiwan Semiconductor Corporation parts do not list RoHS status in the provided specifications. Verify RoHS compliance requirements with your specific application and procurement standards.

Q: What packaging options are available for SA75CA substitutes?

A: All substitute parts use through-hole axial mounting in either DO-15 or DO-204AC package designations (equivalent physical form). Taiwan Semiconductor offers Tape & Reel packaging; Micro Commercial Co and Vishay offer both Tape & Reel and bulk packaging options. Package selection does not affect electrical compatibility.

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