SA48C Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SA48C is a bidirectional Zener TVS diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage suppression applications. It features a 48V reverse standoff voltage with an 81.27V maximum clamping voltage and 6.6A peak pulse current capability in a through-hole DO-204AC (DO-15) axial package. The SA48C is classified as obsolete, making identification of active equivalent parts essential for ongoing design support and procurement.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	48V
Voltage - Breakdown (Min)	50.49V
Voltage - Clamping (Max) @ Ipp	81.27V
Current - Peak Pulse (10/1000µs)	6.6A
Power - Peak Pulse	500W
Operating Temperature Range	-55°C ~ 175°C (TJ)
Mounting Type	Through Hole
Package / Case	DO-204AC, DO-15, Axial
Type	Zener
Bidirectional Channels	1

Substitute Part Grouping Explanation

Substitution of the SA48C is determined by the following critical parameters that must remain constant across all equivalent parts:

Voltage - Reverse Standoff: 48V (nominal)
Voltage - Breakdown (Min): 50.49V or higher
Bidirectional Channels: 1
Mounting Type: Through Hole
Package / Case: DO-204AC, DO-15, Axial
Type: Zener
Operating Temperature Range: -55°C minimum to 175°C maximum

All substitute parts listed maintain these core electrical and mechanical specifications. Variations in clamping voltage (77.4V vs. 81.27V) and peak pulse current (6.5A to 6.7A) remain within acceptable tolerance ranges for general-purpose TVS applications while preserving functional equivalence.

Parameter Comparison

Parameter	SA48C (Littelfuse)	SA48CA (Taiwan Semiconductor)	P5KE48CA-TP (Micro Commercial)	SA48CA-AP (Micro Commercial)	SA48CA-BP (Micro Commercial)	SA48CA-TP (Micro Commercial)
Voltage - Reverse Standoff (Typ)	48V	48V	48V	48V	48V	48V
Voltage - Breakdown (Min)	50.49V	53.3V	53.3V	53.3V	53.3V	53.3V
Voltage - Clamping (Max) @ Ipp	81.27V	77.4V	77.4V	77.4V	77.4V	77.4V
Current - Peak Pulse (10/1000µs)	6.6A	6.7A	6.5A	6.6A	6.6A	6.6A
Power - Peak Pulse	500W	500W	500W	500W	500W	500W
Operating Temperature Range	-55°C ~ 175°C	-55°C ~ 175°C	-65°C ~ 175°C	-55°C ~ 175°C	-55°C ~ 175°C	-55°C ~ 175°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AC, DO-15	DO-204AC, DO-15	DO-15	DO-15	DO-15	DO-15
Type	Zener	Zener	Zener	Zener	Zener	Zener
Bidirectional Channels	1	1	1	1	1	1
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts maintain ROHS3 compliance and active product status, ensuring long-term availability and regulatory alignment. The SA48CA from Taiwan Semiconductor Corporation and the SA48CA variants (SA48CA-AP, SA48CA-BP, SA48CA-TP) from Micro Commercial Co. are direct functional equivalents with identical reverse standoff voltage and comparable electrical performance. The P5KE48CA-TP from Micro Commercial Co. offers an extended operating temperature range (-65°C minimum) and represents an alternative for applications requiring enhanced low-temperature performance.

Selection between substitute parts should be based on packaging requirements (Tape & Reel vs. Bulk), inventory availability, and specific application temperature constraints. All parts are suitable for direct replacement in general-purpose transient voltage suppression circuits.

Frequently Asked Questions (FAQ)

Q: Can SA48CA be used as a direct replacement for SA48C? A: Yes. SA48CA maintains the same 48V reverse standoff voltage, DO-204AC/DO-15 package, and 500W peak pulse power rating. The clamping voltage difference (77.4V vs. 81.27V) and peak pulse current variation (6.7A vs. 6.6A) remain within acceptable tolerance for general-purpose TVS applications.

Q: What is the difference between SA48CA-TP, SA48CA-AP, and SA48CA-BP? A: These are packaging variants of the same electrical part. SA48CA-TP is supplied in Tape & Reel format, while SA48CA-AP and SA48CA-BP are supplied in Bulk packaging. All three maintain identical electrical specifications: 48V reverse standoff, 77.4V clamping voltage, and 6.6A peak pulse current.

Q: Is P5KE48CA-TP compatible with SA48C? A: Yes. P5KE48CA-TP is electrically equivalent with the same 48V reverse standoff voltage and 500W peak pulse power. It offers an extended operating temperature range (-65°C to 175°C) compared to the standard -55°C to 175°C range. Peak pulse current is 6.5A, slightly lower than SA48C's 6.6A.

Q: Are all substitute parts RoHS compliant? A: Yes. All listed substitute parts are ROHS3 compliant, meeting environmental and regulatory requirements for electronic component manufacturing.

Q: What packaging options are available for SA48 series TVS diodes? A: SA48CA is available in Tape & Reel (TR) packaging. SA48CA-AP, SA48CA-BP, and SA48CA-TP are available in Bulk packaging. All maintain the same DO-204AC/DO-15 axial through-hole package format.

Q: Can I use these parts interchangeably in my circuit? A: Yes, provided your circuit design accommodates the specified electrical parameters. All substitute parts share the same 48V reverse standoff voltage, 500W peak pulse power, and through-hole mounting compatibility. Verify that your application can tolerate the clamping voltage range (77.4V to 81.27V) and peak pulse current specifications (6.5A to 6.7A).

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