SA51CA Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SA51CA is a 51V Zener transient voltage suppressor diode in DO-15 axial package manufactured by onsemi. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The SA51CA provides transient voltage suppression for general-purpose applications with a clamping voltage of 82.4V and peak pulse current rating of 6.1A. Active equivalent parts from alternative manufacturers and updated product lines ensure design continuity and component availability.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	51V
Voltage - Breakdown (Min)	56.7V
Voltage - Clamping (Max) @ Ipp	82.4V
Current - Peak Pulse (10/1000µs)	6.1A
Power - Peak Pulse	500W
Type	Zener
Bidirectional Channels	1
Mounting Type	Through Hole
Package / Case	DO-204AC, DO-15, Axial

Substitute Part Grouping Explanation

Substitute parts for the SA51CA are classified into two categories based on electrical and mechanical compatibility:

Direct Equivalents (Identical Electrical Specifications):

SA51CA (Taiwan Semiconductor Corporation)
SA51CA-E3/54 (Vishay General Semiconductor - Diodes Division)
SA51CAHE3/54 (Vishay General Semiconductor - Diodes Division, Automotive Grade)
SA51CA-AP (Micro Commercial Co)
SA51CA-BP (Micro Commercial Co)
SA51CA-TP (Micro Commercial Co)

These parts maintain the core electrical parameters: 51V reverse standoff voltage, 56.7V minimum breakdown voltage, 82.4V maximum clamping voltage, and 500W peak pulse power rating. All are configured as single-channel Zener diodes in through-hole axial packages (DO-15/DO-204AC).

Similar Equivalents (Alternate Manufacturer Series):

P5KE51CA-AP (Micro Commercial Co)
P5KE51CA-BP (Micro Commercial Co)
P5KE51CA-TP (Micro Commercial Co)

These parts share identical voltage and power specifications but represent an alternative product line from Micro Commercial Co. The P5KE series maintains the same electrical performance envelope required for SA51CA replacement.

Key Parameters Determining Substitution:

Reverse standoff voltage: 51V
Clamping voltage: 82.4V
Peak pulse current: 6.1A to 6.3A
Peak pulse power: 500W
Package type: DO-15 axial through-hole
Zener diode type, single channel

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Clamping (Max)	Current - Peak Pulse	Power - Peak Pulse	Product Status	Operating Temperature	Packaging
SA51CA	onsemi	51V	82.4V	6.1A	500W	Obsolete	-	DO-15
SA51CA	Taiwan Semiconductor Corporation	51V	82.4V	6.3A	500W	Active	-55°C ~ 175°C	DO-204AC (DO-15)
SA51CA-E3/54	Vishay General Semiconductor	51V	82.4V	6.1A	500W	Active	-55°C ~ 175°C	DO-204AC (DO-15)
SA51CAHE3/54	Vishay General Semiconductor	51V	82.4V	6.1A	500W	Active	-55°C ~ 175°C	DO-204AC (DO-15)
SA51CA-AP	Micro Commercial Co	51V	82.4V	6.2A	500W	Active	-55°C ~ 175°C	DO-15
SA51CA-BP	Micro Commercial Co	51V	82.4V	6.2A	500W	Active	-55°C ~ 175°C	DO-15
SA51CA-TP	Micro Commercial Co	51V	82.4V	6.2A	500W	Active	-55°C ~ 175°C	DO-15
P5KE51CA-AP	Micro Commercial Co	51V	82.4V	6.1A	500W	Active	-65°C ~ 175°C	DO-15
P5KE51CA-BP	Micro Commercial Co	51V	82.4V	6.1A	500W	Active	-65°C ~ 175°C	DO-15
P5KE51CA-TP	Micro Commercial Co	51V	82.4V	6.1A	500W	Active	-65°C ~ 175°C	DO-15

Engineering Selection Recommendations

For Standard Applications: Select SA51CA-E3/54 or SA51CAHE3/54 from Vishay General Semiconductor. Both parts are active products with established supply chains. The SA51CA-E3/54 is suitable for general-purpose transient suppression. The SA51CAHE3/54 variant includes AEC-Q101 automotive qualification and is appropriate for automotive-grade applications requiring enhanced reliability standards.

For Extended Temperature Range: The P5KE51CA series (P5KE51CA-AP, P5KE51CA-BP, P5KE51CA-TP) from Micro Commercial Co provides operating temperature range of -65°C to 175°C, compared to -55°C to 175°C for other active equivalents. Select this series when designs require operation at lower ambient temperatures.

For Bulk Procurement: Micro Commercial Co offers multiple packaging options (AP, BP, TP designations) for SA51CA and P5KE51CA series in bulk quantities. These variants provide flexibility in procurement and inventory management while maintaining identical electrical specifications.

Product Status Consideration: All recommended substitutes are active products with current manufacturing status, ensuring long-term availability and supply chain stability compared to the obsolete onsemi SA51CA original.

Frequently Asked Questions (FAQ)

Q: Can SA51CA-E3/54 directly replace the obsolete onsemi SA51CA? A: Yes. Both parts maintain identical voltage specifications (51V reverse standoff, 82.4V clamping) and peak pulse power rating (500W). The SA51CA-E3/54 is an active product from Vishay General Semiconductor with the same DO-15 axial package configuration.

Q: What is the difference between SA51CA-E3/54 and SA51CAHE3/54? A: Both parts have identical electrical specifications. The SA51CAHE3/54 includes AEC-Q101 automotive qualification and is designated for automotive-grade applications. Select SA51CAHE3/54 for designs requiring automotive reliability standards.

Q: Are P5KE51CA parts compatible with SA51CA applications? A: Yes. The P5KE51CA series maintains the same 51V reverse standoff voltage, 82.4V clamping voltage, and 500W peak pulse power rating. The P5KE series represents an alternative product line from Micro Commercial Co with identical electrical performance. The P5KE series offers extended temperature range (-65°C to 175°C) compared to standard variants.

Q: What do the packaging designations (AP, BP, TP) indicate? A: These designations identify different packaging and tape configurations from Micro Commercial Co. All three variants (AP, BP, TP) maintain identical electrical specifications and DO-15 axial package form factor. Selection depends on procurement and assembly requirements.

Q: Can I use parts with 6.2A or 6.3A peak pulse current instead of 6.1A? A: Yes. The peak pulse current specifications (6.1A, 6.2A, 6.3A) fall within the same electrical performance envelope for this voltage class. All variants maintain the 500W peak pulse power rating and are suitable for SA51CA replacement.

Q: Is RoHS compliance required for substitute selection? A: The Vishay SA51CA-E3/54 and SA51CAHE3/54 parts are ROHS3 compliant. Micro Commercial Co variants do not specify RoHS status in the provided data. Verify RoHS compliance requirements with your procurement specifications before final part selection.

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