SA48A Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SA48A is a unidirectional Zener transient voltage suppressor diode manufactured by onsemi, designed for general-purpose overvoltage protection applications. This component features a 48V reverse standoff voltage with a 77.4V maximum clamping voltage and 6.5A peak pulse current capability in a through-hole axial package (DO-204AC/DO-15).

The SA48A is classified as obsolete by onsemi. Equivalent and substitute parts are available from active manufacturers including Vishay General Semiconductor, Littelfuse Inc., Micro Commercial Co, and Taiwan Semiconductor Corporation, providing continuity for designs requiring this voltage and current rating.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	48	V
Voltage - Breakdown (Min)	53.3	V
Voltage - Clamping (Max) @ Ipp	77.4	V
Current - Peak Pulse (10/1000µs)	6.5	A
Power - Peak Pulse	500	W
Operating Temperature Range	-55°C to 150°C	TJ
Mounting Type	Through Hole	—
Package / Case	DO-204AC, DO-15, Axial	—
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution eligibility for the SA48A is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): 48V
Voltage - Breakdown (Min): 53.3V
Voltage - Clamping (Max) @ Ipp: 77.4V
Current - Peak Pulse (10/1000µs): 6.5A minimum
Power - Peak Pulse: 500W minimum
Mounting Type: Through Hole
Package / Case: DO-204AC, DO-15, or Axial equivalent
Type: Zener, Unidirectional

Parts meeting these electrical specifications and physical package requirements are classified as direct equivalents or suitable substitutes. The SA48A-E3/54 and SA48AHE3/54 from Vishay, and the SA48A from Taiwan Semiconductor Corporation are direct equivalents with identical electrical ratings. The P5KE48A series from Micro Commercial Co meets all electrical parameters. The 5KP48A from Littelfuse exceeds the peak pulse current specification (65.9A vs. 6.5A) and power rating (5000W vs. 500W), making it suitable for applications requiring higher transient energy absorption.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Breakdown Min (V)	Voltage - Clamping Max (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temp (°C)	Package	Product Status
SA48A	onsemi	48	53.3	77.4	6.5	500	-55 to 150	DO-204AC, DO-15, Axial	Obsolete
SA48A-E3/54	Vishay General Semiconductor	48	53.3	77.4	6.5	500	-55 to 175	DO-204AC, DO-15, Axial	Active
SA48AHE3/54	Vishay General Semiconductor	48	53.3	77.4	6.5	500	-55 to 175	DO-204AC, DO-15, Axial	Active
5KP48A	Littelfuse Inc.	48	53.3	77.4	65.9	5000	-55 to 175	P600, Axial	Active
P5KE48A-AP	Micro Commercial Co	48	53.3	77.4	6.5	500	-65 to 175	DO-204AC, DO-15, Axial	Active
P5KE48A-BP	Micro Commercial Co	48	53.3	77.4	6.5	500	-65 to 175	DO-204AC, DO-15, Axial	Active
P5KE48A-TP	Micro Commercial Co	48	53.3	77.4	6.5	500	-65 to 175	DO-204AC, DO-15, Axial	Active
SA48A	Taiwan Semiconductor Corporation	48	53.3	77.4	6.7	500	-55 to 175	DO-204AC, DO-15, Axial	Active

Engineering Selection Recommendations

Direct Equivalents (Recommended for Obsolete Part Replacement):

The SA48A-E3/54 and SA48AHE3/54 from Vishay General Semiconductor are direct electrical and mechanical equivalents. Both are ROHS3 compliant and active products. The SA48AHE3/54 carries AEC-Q101 automotive qualification, suitable for automotive-grade applications. The SA48A from Taiwan Semiconductor Corporation is also a direct equivalent with active product status and ROHS3 compliance.

Suitable Substitutes (Matching Electrical Specifications):

The P5KE48A series (P5KE48A-AP, P5KE48A-BP, P5KE48A-TP) from Micro Commercial Co provides identical electrical performance with extended lower operating temperature range (-65°C vs. -55°C). These parts are active and suitable for general-purpose applications.

Higher-Power Alternative:

The 5KP48A from Littelfuse Inc. exceeds the SA48A specifications with 65.9A peak pulse current and 5000W peak pulse power. This part is suitable for applications requiring enhanced transient energy absorption while maintaining the same voltage clamping characteristics. The 5KP48A uses a P600 package rather than DO-204AC/DO-15, requiring mechanical redesign consideration.

Frequently Asked Questions (FAQ)

Q: Can I use the 5KP48A as a direct replacement for the SA48A?

A: The 5KP48A meets all voltage specifications (48V standoff, 77.4V clamping) but differs in package type (P600 vs. DO-204AC/DO-15) and current/power ratings (65.9A/5000W vs. 6.5A/500W). Physical board layout modification is required. Use only if your application can accommodate the larger package and higher ratings do not create design conflicts.

Q: What is the difference between SA48A-E3/54 and SA48AHE3/54?

A: Both are Vishay equivalents with identical electrical specifications. The SA48AHE3/54 includes AEC-Q101 automotive qualification and is suitable for automotive applications. The SA48A-E3/54 is for general-purpose applications. Both are ROHS3 compliant and active products.

Q: Are the P5KE48A variants (AP, BP, TP) interchangeable?

A: Yes. The P5KE48A-AP, P5KE48A-BP, and P5KE48A-TP from Micro Commercial Co have identical electrical specifications and package types. The suffix designations indicate different packaging or distribution channels but do not affect electrical performance or compatibility.

Q: Does the Taiwan Semiconductor SA48A differ from the onsemi SA48A?

A: Both share the same part number but are from different manufacturers. The Taiwan Semiconductor version has a slightly higher peak pulse current (6.7A vs. 6.5A) and extended operating temperature range (-55°C to 175°C vs. -55°C to 150°C). Both are compatible substitutes with identical voltage ratings and package types.

Q: What compliance certifications should I verify for my application?

A: All substitute parts listed are REACH Unaffected. Vishay parts are ROHS3 compliant. The SA48AHE3/54 carries AEC-Q101 automotive qualification. Verify RoHS compliance requirements for your specific application before selection.

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