SA54 TVS Diode Equivalent & Substitute Parts

Part Overview

The SA54 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. Featuring a 54V reverse standoff voltage and 91.46V maximum clamping voltage, the SA54 operates through a DO-204AC (DO-15) axial package rated for -55°C to 175°C junction temperature operation.

The SA54 is classified as obsolete. Equivalent and substitute parts are available from active product lines that maintain identical or compatible electrical and mechanical specifications, ensuring continued design support and procurement availability.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	54	V
Voltage - Breakdown (Min)	56.84	V
Voltage - Clamping (Max) @ Ipp	91.46	V
Current - Peak Pulse (10/1000µs)	5.9	A
Power - Peak Pulse	500	W
Operating Temperature Range	-55 to 175	°C (TJ)
Mounting Type	Through Hole	—
Package / Case	DO-204AC (DO-15)	—
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution of the SA54 is determined by strict equivalence across the following critical parameters:

Voltage Rating: Reverse standoff voltage of 54V and breakdown voltage minimum of 56.84V
Clamping Performance: Maximum clamping voltage at peak pulse current
Current Handling: Peak pulse current rating of 5.9A at 10/1000µs pulse width
Power Dissipation: Peak pulse power rating of 500W
Package Compatibility: DO-204AC (DO-15) axial through-hole configuration
Temperature Range: Operating junction temperature from -55°C to 175°C
Device Type: Unidirectional Zener TVS diode

Substitute parts SA54A, SA54A-AP, SA54A-BP, and SA54A-TP maintain these critical electrical specifications and package requirements, enabling direct functional replacement in existing circuit designs.

Parameter Comparison

Parameter	SA54 (Littelfuse)	SA54A (Taiwan Semiconductor)	SA54A-AP (Micro Commercial)	SA54A-BP (Micro Commercial)	SA54A-TP (Micro Commercial)
Voltage - Reverse Standoff (Typ)	54V	54V	54V	54V	54V
Voltage - Breakdown (Min)	56.84V	60V	60V	60V	60V
Voltage - Clamping (Max) @ Ipp	91.46V	87.1V	87.1V	87.1V	87.1V
Current - Peak Pulse (10/1000µs)	5.9A	6A	5.9A	5.9A	5.9A
Power - Peak Pulse	500W	500W	500W	500W	500W
Operating Temperature Range	-55 to 175°C	-55 to 175°C	-55 to 175°C	-55 to 175°C	-55 to 175°C
Package / Case	DO-204AC (DO-15)	DO-204AC (DO-15)	DO-15	DO-15	DO-15
Type	Zener	Zener	Zener	Zener	Zener
Unidirectional Channels	1	1	1	1	1
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	—	—	—

Engineering Selection Recommendations

SA54A (Taiwan Semiconductor Corporation) is the primary direct equivalent, maintaining active product status with ROHS3 compliance. This part provides the closest electrical match with a 6A peak pulse current rating, exceeding the original 5.9A specification while maintaining all voltage parameters within acceptable tolerance.

SA54A-AP, SA54A-BP, and SA54A-TP (Micro Commercial Co) are functionally equivalent alternatives available in bulk packaging. These variants maintain identical electrical specifications to SA54A with 5.9A peak pulse current matching the original SA54 rating. All three are active products with REACH unaffected status.

Selection between these substitute options depends on packaging requirements and procurement logistics. The Taiwan Semiconductor SA54A offers tape & reel packaging, while Micro Commercial variants are supplied in bulk configuration. All substitute parts are suitable for direct replacement in applications requiring 54V standoff voltage protection with DO-15 axial package compatibility.

Frequently Asked Questions (FAQ)

Q: Can SA54A substitute directly for SA54 in existing designs?

A: Yes. SA54A maintains identical reverse standoff voltage (54V), operating temperature range (-55 to 175°C), and DO-204AC (DO-15) package configuration. The clamping voltage of 87.1V is lower than the original 91.46V, providing improved protection margin. Peak pulse current is rated at 6A, exceeding the original 5.9A specification.

Q: What is the difference between SA54A and SA54A-AP/BP/TP variants?

A: All four substitute parts maintain identical electrical specifications. The primary difference is packaging: SA54A is supplied in tape & reel format, while SA54A-AP, SA54A-BP, and SA54A-TP are supplied in bulk. Selection depends on procurement volume and assembly process requirements.

Q: Are substitute parts RoHS compliant?

A: SA54A is ROHS3 compliant. Compliance information for SA54A-AP, SA54A-BP, and SA54A-TP variants is not specified in available documentation. Verify RoHS status with the supplier for applications requiring regulatory compliance confirmation.

Q: Does the lower clamping voltage of substitute parts affect circuit performance?

A: The substitute parts specify a maximum clamping voltage of 87.1V compared to the original 91.46V. This represents improved clamping performance, reducing transient voltage peaks and providing enhanced protection. Circuit designs rated for 91.46V clamping will operate safely with 87.1V clamping.

Q: Can these parts be used interchangeably in production?

A: Yes, all substitute parts are functionally equivalent for general-purpose TVS applications with 54V standoff voltage requirements. Ensure packaging format (tape & reel vs. bulk) aligns with assembly equipment specifications before production transition.

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