SA75A Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SA75A is a unidirectional Zener-type transient voltage suppressor diode manufactured by onsemi, designed for general-purpose overvoltage protection applications. The device features a 75V reverse standoff voltage with 121V maximum clamping voltage and 4.1A peak pulse current capability in a through-hole DO-15 package. The main part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and component procurement.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	75	V
Voltage - Breakdown (Min)	83.3	V
Voltage - Clamping (Max) @ Ipp	121	V
Current - Peak Pulse (10/1000µs)	4.1	A
Power - Peak Pulse	500	W
Type	Zener	-
Unidirectional Channels	1	-
Mounting Type	Through Hole	-
Package / Case	DO-204AC, DO-15, Axial	-

Substitute Part Grouping Explanation

Substitute parts for the SA75A are classified into two categories based on electrical and mechanical compatibility:

Direct Substitutes maintain identical electrical specifications and package form factors:

Voltage - Reverse Standoff: 75V
Voltage - Clamping (Max) @ Ipp: 121V
Current - Peak Pulse: 4.1A to 4.2A (within tolerance)
Power - Peak Pulse: 500W
Mounting Type: Through Hole
Package: DO-15 or DO-204AC (DO-15)

Similar Substitutes share core electrical parameters but may have different base product numbers or slightly different peak pulse current ratings:

Voltage - Reverse Standoff: 75V
Voltage - Clamping (Max) @ Ipp: 121V
Current - Peak Pulse: 4.1A
Power - Peak Pulse: 500W
Mounting Type: Through Hole
Package: DO-15

Parameter Comparison

Part Number	Manufacturer	VWM (V)	VBR (V)	VC (V)	Ipp (A)	Ppk (W)	Package	Status
SA75A	onsemi	75	83.3	121	4.1	500	DO-15	Obsolete
SA75A-AP	Micro Commercial Co	75	83.3	121	4.2	500	DO-15	Active
SA75A-BP	Micro Commercial Co	75	83.3	121	4.2	500	DO-15	Active
SA75A-E3/54	Vishay General Semiconductor - Diodes Division	75	83.3	121	4.1	500	DO-204AC (DO-15)	Active
SA75AHE3/54	Vishay General Semiconductor - Diodes Division	75	83.3	121	4.1	500	DO-204AC (DO-15)	Active
P5KE75A-AP	Micro Commercial Co	75	83.3	121	4.1	500	DO-15	Active
P5KE75A-BP	Micro Commercial Co	75	83.3	121	4.1	500	DO-15	Active
P5KE75A-TP	Micro Commercial Co	75	83.3	121	4.1	500	DO-15	Active
SA75A	Taiwan Semiconductor Corporation	75	83.3	121	4.3	500	DO-204AC (DO-15)	Active

Engineering Selection Recommendations

Direct Substitutes (Preferred for Drop-In Replacement):

SA75A-AP and SA75A-BP from Micro Commercial Co are direct functional equivalents with active product status. Both maintain the 75V standoff voltage, 121V clamping voltage, and 500W peak pulse power. The peak pulse current of 4.2A exceeds the original 4.1A specification, providing additional margin. Both are available in bulk packaging with -55°C to 175°C operating temperature range.

SA75A-E3/54 and SA75AHE3/54 from Vishay General Semiconductor are active alternatives with identical electrical specifications. SA75A-E3/54 is RoHS3 compliant. SA75AHE3/54 carries AEC-Q101 automotive qualification, suitable for applications requiring automotive-grade components. Both are supplied in Tape & Reel packaging in DO-204AC (DO-15) form factor.

Similar Substitutes (Alternative Series):

P5KE75A-AP, P5KE75A-BP, and P5KE75A-TP from Micro Commercial Co represent an alternative product series with identical core electrical parameters. All three maintain 75V standoff, 121V clamping, and 4.1A peak pulse current. Operating temperature range extends to -65°C, providing wider low-temperature capability. These parts are available in bulk packaging.

Taiwan Semiconductor Corporation SA75A offers an alternative source with 4.3A peak pulse current, exceeding the original specification. Supplied in Tape & Reel packaging with DO-204AC (DO-15) form factor and RoHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can SA75A-AP or SA75A-BP be used as direct replacements for the obsolete onsemi SA75A?

A: Yes. Both parts maintain identical voltage specifications (75V standoff, 121V clamping) and power rating (500W peak pulse). The 4.2A peak pulse current exceeds the original 4.1A, providing additional transient protection margin. Both are active products with established supply chains.

Q: What is the difference between SA75A-E3/54 and SA75AHE3/54?

A: Both parts share identical electrical specifications and DO-204AC (DO-15) packaging. SA75AHE3/54 includes AEC-Q101 automotive qualification, making it suitable for automotive and high-reliability applications. SA75A-E3/54 is the standard industrial-grade equivalent.

Q: Are P5KE75A series parts compatible with SA75A applications?

A: Yes. P5KE75A-AP, P5KE75A-BP, and P5KE75A-TP maintain the same voltage and power specifications as SA75A. The primary difference is the product series designation. All three are active products with -65°C to 175°C operating temperature range, providing extended low-temperature performance compared to the -55°C minimum of SA75A-series parts.

Q: What packaging options are available for SA75A substitutes?

A: Substitute parts are available in two package formats: DO-15 (axial through-hole) and DO-204AC (DO-15 equivalent). Micro Commercial Co parts are supplied in bulk packaging. Vishay and Taiwan Semiconductor Corporation parts are supplied in Tape & Reel format. Package selection depends on assembly process requirements.

Q: Which substitute offers the best compliance certifications?

A: SA75AHE3/54 from Vishay carries AEC-Q101 automotive qualification and RoHS3 compliance. SA75A-E3/54 is RoHS3 compliant. All other active substitutes maintain REACH Unaffected and EAR99 ECCN status. Selection depends on application compliance requirements.

Q: Can I use Taiwan Semiconductor Corporation SA75A as a substitute?

A: Yes. This part maintains identical voltage specifications with 4.3A peak pulse current, exceeding the original 4.1A rating. It is supplied in Tape & Reel packaging with DO-204AC (DO-15) form factor and RoHS3 compliance. It is suitable for applications requiring higher transient current handling capability.

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