SA33CA Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SA33CA is a 33V Zener transient voltage suppressor diode manufactured by onsemi in DO-15 (DO-204AC) through-hole package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The SA33CA provides bidirectional transient voltage suppression with a 53.3V maximum clamping voltage and 9.4A peak pulse current capability, suitable for general-purpose overvoltage protection applications.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	33V	V
Voltage - Breakdown (Min)	36.7V	V
Voltage - Clamping (Max) @ Ipp	53.3V	V
Current - Peak Pulse (10/1000µs)	9.4A	A
Power - Peak Pulse	500W	W
Type	Zener	-
Bidirectional Channels	1	-
Mounting Type	Through Hole	-
Package / Case	DO-204AC, DO-15, Axial	-

Substitute Part Grouping Explanation

Substitute parts for the SA33CA are classified into two categories based on electrical parameter alignment:

Direct Equivalents maintain identical or near-identical electrical specifications:

Voltage - Reverse Standoff: 33V
Voltage - Clamping (Max) @ Ipp: 53.3V
Current - Peak Pulse: 9.4A to 9.6A
Power - Peak Pulse: 500W
Package: DO-15 or DO-204AC through-hole

Similar Alternatives provide comparable transient suppression performance within acceptable parameter tolerances but may differ in peak current or clamping voltage:

Voltage - Reverse Standoff: 30.8V to 33.3V
Voltage - Clamping (Max) @ Ipp: 49.9V to 53.9V
Current - Peak Pulse: 11.1A to 12A
Power - Peak Pulse: 500W to 600W
Package: DO-15 or DO-204AC through-hole

All substitute parts maintain the same Zener type, bidirectional channel configuration, and through-hole mounting requirement as the original SA33CA.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package / Case	Product Status	Operating Temperature
SA33CA	onsemi	33V	53.3V	9.4A	500W	DO-204AC, DO-15, Axial	Obsolete	-
SA33CA	Fairchild Semiconductor	33V	53.3V	9.6A	500W	DO-204AC, DO-15, Axial	Obsolete	-55°C ~ 175°C (TJ)
SA33CA-E3/54	Vishay General Semiconductor - Diodes Division	33V	53.3V	9.4A	500W	DO-204AC, DO-15, Axial	Active	-55°C ~ 175°C (TJ)
SA33CAHE3/54	Vishay General Semiconductor - Diodes Division	33V	53.3V	9.4A	500W	DO-204AC, DO-15, Axial	Active	-55°C ~ 175°C (TJ)
SA33CA-AP	Micro Commercial Co	33V	53.3V	9.6A	500W	DO-204AC, DO-15, Axial	Active	-55°C ~ 175°C (TJ)
P5KE33CA-AP	Micro Commercial Co	33V	53.3V	9.4A	500W	DO-204AC, DO-15, Axial	Active	-65°C ~ 175°C (TJ)
P5KE33CA-BP	Micro Commercial Co	33V	53.3V	9.4A	500W	DO-204AC, DO-15, Axial	Active	-65°C ~ 175°C (TJ)
P5KE33CA-TP	Micro Commercial Co	33V	53.3V	9.4A	500W	DO-204AC, DO-15, Axial	Active	-65°C ~ 175°C (TJ)
BZW06-33B	Diotec Semiconductor	33.3V	53.9V	11.1A	600W	DO-204AC, DO-15, Axial	Active	-50°C ~ 175°C (TJ)
P6KE36CA	Taiwan Semiconductor Corporation	30.8V	49.9V	12A	600W	DO-204AC, DO-15, Axial	Active	-
P6KE39CA	Fairchild Semiconductor	-	-	-	-	-	Active	-

Engineering Selection Recommendations

Direct Equivalent Selection (Preferred for Drop-In Replacement)

SA33CA-E3/54 (Vishay General Semiconductor - Diodes Division) and SA33CA-AP (Micro Commercial Co) are the primary direct equivalents. Both maintain identical reverse standoff voltage (33V), clamping voltage (53.3V), and peak pulse current specifications within acceptable tolerance. SA33CA-E3/54 carries Active product status with ROHS3 compliance and is available in Cut Tape packaging. SA33CA-AP is also Active with identical electrical performance and offers extended operating temperature range (-65°C to 175°C).

Automotive-Grade Alternative

SA33CAHE3/54 (Vishay General Semiconductor - Diodes Division) provides identical electrical specifications with AEC-Q101 automotive qualification and Tape & Reel packaging. This variant is suitable for applications requiring automotive-grade components.

Extended Temperature Range Options

P5KE33CA series variants (P5KE33CA-AP, P5KE33CA-BP, P5KE33CA-TP) from Micro Commercial Co maintain identical electrical parameters with extended operating temperature range (-65°C to 175°C) compared to standard variants. These are Active products suitable for temperature-critical applications.

Higher Power Capability Alternative

BZW06-33B (Diotec Semiconductor) provides increased peak pulse current (11.1A) and power dissipation (600W) with marginally higher clamping voltage (53.9V) and reverse standoff voltage (33.3V). This variant is suitable for applications requiring enhanced transient suppression capability.

Lower Voltage Alternative

P6KE36CA (Taiwan Semiconductor Corporation) operates at 30.8V reverse standoff with 49.9V clamping voltage and 12A peak pulse current. This variant is suitable only when lower voltage suppression thresholds are acceptable for the application.

Frequently Asked Questions (FAQ)

Q: Can SA33CA-E3/54 be used as a direct replacement for SA33CA?

A: Yes. SA33CA-E3/54 maintains identical reverse standoff voltage (33V), clamping voltage (53.3V), and peak pulse current (9.4A). Both use DO-15 through-hole packaging. The primary difference is product status (Active vs. Obsolete) and operating temperature specification (-55°C to 175°C for SA33CA-E3/54).

Q: What is the difference between SA33CA-E3/54 and SA33CAHE3/54?

A: Both parts maintain identical electrical specifications. SA33CAHE3/54 includes AEC-Q101 automotive qualification and is supplied in Tape & Reel packaging, while SA33CA-E3/54 is supplied in Cut Tape packaging. Selection depends on packaging requirements and automotive compliance needs.

Q: Can BZW06-33B replace SA33CA in all applications?

A: BZW06-33B provides higher peak pulse current (11.1A vs. 9.4A) and power dissipation (600W vs. 500W), making it suitable for applications requiring enhanced transient suppression. However, the slightly higher clamping voltage (53.9V vs. 53.3V) and reverse standoff voltage (33.3V vs. 33V) must be verified against circuit requirements before substitution.

Q: Are all substitute parts available in DO-15 through-hole packaging?

A: Yes. All listed substitute parts are available in DO-15 (DO-204AC) through-hole axial packaging, maintaining mechanical compatibility with the original SA33CA footprint.

Q: What compliance certifications apply to these substitute parts?

A: SA33CA-E3/54 and SA33CA-AP carry ROHS3 compliance. SA33CAHE3/54 includes AEC-Q101 automotive qualification. P6KE36CA carries ROHS3 compliance. Compliance requirements should be verified against specific application standards before final selection.

Q: Can P5KE33CA series parts be used in temperature-critical applications?

A: Yes. P5KE33CA-AP, P5KE33CA-BP, and P5KE33CA-TP maintain identical electrical specifications with extended operating temperature range (-65°C to 175°C), making them suitable for applications requiring operation at lower ambient temperatures.

Q: What is the difference between P5KE33CA-AP, P5KE33CA-BP, and P5KE33CA-TP?

A: All three variants maintain identical electrical specifications and operating temperature range. The suffix designations (AP, BP, TP) indicate different packaging or supplier configurations. Electrical performance is equivalent across all three variants.

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