SA33C-E3/54 Equivalent & Substitute Parts

Part Overview

The SA33C-E3/54 is a Transient Voltage Suppressor (TVS) diode from Vishay General Semiconductor - Diodes Division, part of the TransZorb® series. This component is designed for general-purpose transient voltage suppression applications with a 33V reverse standoff voltage rating and 59V maximum clamping voltage. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	SA33C-E3/54
Manufacturer	Vishay General Semiconductor - Diodes Division
Category	Transient Voltage Suppressors (TVS)
Series	TransZorb®
Product Status	Obsolete
Type	Zener
Bidirectional Channels	1
Voltage - Reverse Standoff (Typ)	33V
Voltage - Breakdown (Min)	36.7V
Voltage - Clamping (Max) @ Ipp	59V
Current - Peak Pulse (10/1000µs)	8.5A
Power - Peak Pulse	500W
Operating Temperature	-55°C ~ 175°C (TJ)
Mounting Type	Through Hole
Package / Case	DO-204AC, DO-15, Axial
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the SA33C-E3/54 is determined by the following critical electrical and mechanical parameters:

Voltage - Reverse Standoff (Typ): 33V
Voltage - Breakdown (Min): 36.7V
Bidirectional Channels: 1
Type: Zener
Mounting Type: Through Hole
Package / Case: DO-204AC, DO-15, Axial
Operating Temperature Range: -55°C ~ 175°C

The substitute parts identified maintain these core specifications. Variations in clamping voltage (53.3V to 59V) and peak pulse current (8.5A to 9.6A) remain within acceptable operational parameters for general-purpose TVS applications. All substitute parts maintain the same RoHS3 compliance and MSL rating.

Parameter Comparison

Parameter	SA33C-E3/54	SA33CA-E3/54	SA33CA	SA33CA-TP	P6KE39CA
Manufacturer	Vishay	Vishay	Fairchild	Micro Commercial Co	Fairchild
Product Status	Obsolete	Active	Obsolete	Active	Active
Voltage - Reverse Standoff (Typ)	33V	33V	33V	33V	-
Voltage - Breakdown (Min)	36.7V	36.7V	36.7V	36.7V	-
Voltage - Clamping (Max) @ Ipp	59V	53.3V	53.3V	53.3V	-
Current - Peak Pulse (10/1000µs)	8.5A	9.4A	9.6A	9.6A	-
Power - Peak Pulse	500W	500W	500W	500W	-
Type	Zener	Zener	Zener	Zener	-
Bidirectional Channels	1	1	1	1	-
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	-
Package / Case	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial	DO-15, Axial	-
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	-
Packaging Option	-	Cut Tape (CT)	Bulk	Tape & Reel (TR)	Bulk

Engineering Selection Recommendations

For applications currently using the SA33C-E3/54, the following selection criteria apply:

Active Status Priority: SA33CA-E3/54, SA33CA-TP, and P6KE39CA are active products with ongoing manufacturer support. SA33CA is obsolete and should be avoided for new designs unless existing inventory is available.

Electrical Compatibility: SA33CA-E3/54 and SA33CA-TP provide the closest electrical match with 33V reverse standoff, 36.7V minimum breakdown, and 53.3V clamping voltage. These parts are direct functional equivalents with improved peak pulse current ratings (9.4A and 9.6A respectively versus 8.5A).

Packaging Considerations: SA33CA-E3/54 is available in Cut Tape packaging, SA33CA-TP in Tape & Reel, and SA33CA in Bulk. Select based on procurement volume and assembly requirements.

Compliance: All substitute parts maintain ROHS3 compliance and MSL rating of 1 (Unlimited), ensuring regulatory and environmental compatibility.

Inventory Availability: SA33CA-E3/54 has 4601 units in stock, SA33CA-TP has 930 units, and P6KE39CA has 27100 units available.

Frequently Asked Questions (FAQ)

Q: Can SA33CA-E3/54 directly replace SA33C-E3/54?

A: Yes. Both parts share identical reverse standoff voltage (33V), breakdown voltage (36.7V), and operating temperature range (-55°C ~ 175°C). SA33CA-E3/54 has a lower clamping voltage (53.3V versus 59V) and higher peak pulse current (9.4A versus 8.5A), making it functionally compatible for general-purpose TVS applications.

Q: What is the difference between SA33CA-E3/54 and SA33CA-TP?

A: Both parts have identical electrical specifications (33V standoff, 36.7V breakdown, 53.3V clamping, 9.6A peak pulse current). The primary difference is packaging: SA33CA-E3/54 is supplied in Cut Tape, while SA33CA-TP is supplied in Tape & Reel format. SA33CA-TP is sourced from Micro Commercial Co, while SA33CA-E3/54 is from Vishay.

Q: Is P6KE39CA a suitable substitute?

A: P6KE39CA from Fairchild Semiconductor is listed as a manufacturer-recommended substitute. However, detailed electrical parameters are not provided in the specification data. Verification against application requirements is necessary before selection.

Q: Why is the clamping voltage different between SA33C-E3/54 and SA33CA-E3/54?

A: The SA33C-E3/54 specifies a maximum clamping voltage of 59V, while SA33CA-E3/54 specifies 53.3V. Both maintain the same 33V reverse standoff and 36.7V minimum breakdown voltage. The lower clamping voltage in SA33CA-E3/54 represents improved performance characteristics within the same voltage class.

Q: Are all substitute parts through-hole mounted?

A: Yes. SA33C-E3/54, SA33CA-E3/54, SA33CA, and SA33CA-TP are all through-hole mounted in DO-204AC or DO-15 axial packages. P6KE39CA packaging details are not fully specified in the provided data.

Q: What is the operating temperature range for substitute parts?

A: SA33CA-E3/54, SA33CA, and SA33CA-TP all operate from -55°C to 175°C, matching the original SA33C-E3/54. SA33CA-TP specifies TA (ambient temperature) rather than TJ (junction temperature), but the range remains identical.

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