SA45CA Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SA45CA is a 45V Zener transient voltage suppressor diode in DO-15 (DO-204AC) axial through-hole package, rated for 72.7V clamping voltage and 6.9A peak pulse current. Manufactured by onsemi, this component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	45V
Voltage - Breakdown (Min)	50V
Voltage - Clamping (Max) @ Ipp	72.7V
Current - Peak Pulse (10/1000µs)	6.9A
Power - Peak Pulse	500W
Type	Zener
Bidirectional Channels	1
Mounting Type	Through Hole
Package / Case	DO-204AC, DO-15, Axial

Substitute Part Grouping Explanation

Substitution for the SA45CA is determined by strict equivalence across the following electrical and mechanical parameters:

Voltage - Reverse Standoff: 45V (±tolerance)
Voltage - Breakdown (Min): 50V
Voltage - Clamping (Max) @ Ipp: 72.7V
Current - Peak Pulse (10/1000µs): 6.9A minimum
Power - Peak Pulse: 500W
Package / Case: DO-204AC or DO-15 axial through-hole
Type: Zener, Bidirectional (1 channel)

Substitute parts are grouped into two categories:

Direct Equivalents: Parts with identical electrical specifications and active product status from established manufacturers.

Similar Equivalents: Parts meeting all electrical parameters with minor variations in peak pulse current (within acceptable range) or from alternative manufacturers with active product status.

Parameter Comparison

Part Number	Manufacturer	Voltage Standoff (V)	Voltage Breakdown Min (V)	Voltage Clamping Max @ Ipp (V)	Current Peak Pulse (A)	Power Peak Pulse (W)	Package	Product Status	Operating Temp (°C)
SA45CA	onsemi	45	50	72.7	6.9	500	DO-15	Obsolete	-
SA45CA-E3/54	Vishay General Semiconductor	45	50	72.7	6.9	500	DO-204AC (DO-15)	Active	-55 to 175
SA45CAHE3/54	Vishay General Semiconductor	45	50	72.7	6.9	500	DO-204AC (DO-15)	Active	-55 to 175
P5KE45CA-AP	Micro Commercial Co	45	50	72.7	6.9	500	DO-15	Active	-65 to 175
P5KE45CA-BP	Micro Commercial Co	45	50	72.7	6.9	500	DO-15	Active	-65 to 175
P5KE45CA-TP	Micro Commercial Co	45	50	72.7	6.9	500	DO-15	Active	-65 to 175
SA45CA	Taiwan Semiconductor Corporation	45	50	72.7	7.2	500	DO-204AC (DO-15)	Active	-55 to 175
SA45CA-AP	Micro Commercial Co	45	50	72.7	7.0	500	DO-15	Active	-55 to 175
SA45CA-BP	Micro Commercial Co	45	50	72.7	7.0	500	DO-15	Active	-55 to 175
SA45CA-TP	Micro Commercial Co	45	50	72.7	7.0	500	DO-15	Active	-55 to 175

Engineering Selection Recommendations

Direct Equivalents (Preferred):

SA45CA-E3/54 and SA45CAHE3/54 from Vishay General Semiconductor are direct electrical equivalents with active product status and ROHS3 compliance. SA45CAHE3/54 includes AEC-Q101 automotive qualification for applications requiring automotive-grade components.

Active Alternatives:

SA45CA from Taiwan Semiconductor Corporation provides active product status with ROHS3 compliance and slightly elevated peak pulse current (7.2A), offering margin above the original 6.9A specification.

Micro Commercial Co variants (P5KE45CA series and SA45CA variants) maintain full electrical equivalence with active product status. The P5KE45CA series extends operating temperature range to -65°C, suitable for extended temperature applications. Packaging variants (-AP, -BP, -TP) indicate different tape and reel configurations or bulk packaging options.

All substitute parts maintain identical voltage ratings, clamping characteristics, and through-hole DO-15 package compatibility with the original SA45CA.

Frequently Asked Questions (FAQ)

Q: Can SA45CA-E3/54 directly replace the obsolete onsemi SA45CA?

A: Yes. SA45CA-E3/54 meets all electrical specifications: 45V standoff, 50V breakdown minimum, 72.7V clamping maximum, and 6.9A peak pulse current. Both use DO-204AC (DO-15) axial through-hole packaging. The Vishay part is active and ROHS3 compliant.

Q: What is the difference between SA45CA-E3/54 and SA45CAHE3/54?

A: Both are electrically identical with matching voltage and current ratings. SA45CAHE3/54 includes AEC-Q101 automotive qualification, making it suitable for automotive applications requiring qualified components. Standard SA45CA-E3/54 is suitable for general-purpose applications.

Q: Are Micro Commercial Co P5KE45CA parts compatible?

A: Yes. P5KE45CA-AP, P5KE45CA-BP, and P5KE45CA-TP maintain identical electrical specifications and DO-15 packaging. The suffix indicates packaging configuration. Operating temperature extends to -65°C, providing wider temperature margin than the original part.

Q: What is the difference between SA45CA variants from different manufacturers?

A: All SA45CA variants (from Vishay, Taiwan Semiconductor, and Micro Commercial Co) meet the core 45V/72.7V/6.9A specification. Differences are in peak pulse current tolerance (6.9A to 7.2A), operating temperature range, and compliance certifications. All are compatible for general-purpose transient suppression applications.

Q: Can I use parts with higher peak pulse current ratings?

A: Yes. Parts rated for 7.0A or 7.2A peak pulse current exceed the original 6.9A requirement and are electrically compatible. Higher current ratings provide additional margin for transient suppression without affecting circuit operation.

Q: Does packaging type affect substitution?

A: No. All substitute parts use DO-204AC or DO-15 axial through-hole packaging, which are mechanically and electrically equivalent. Packaging suffixes (-AP, -BP, -TP, -E3/54) indicate tape and reel configuration or bulk packaging, not physical package differences.

Q: Are there temperature rating differences I should consider?

A: Yes. The original onsemi SA45CA does not specify operating temperature. Substitute parts specify -55°C to 175°C or -65°C to 175°C. For applications requiring extended low-temperature operation, Micro Commercial Co variants rated to -65°C provide additional margin.

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