P6SMB33CAT3 Equivalent & Substitute Parts

Part Overview

The P6SMB33CAT3 is a transient voltage suppressor (TVS) diode manufactured by onsemi, designed for surface mount applications in the DO-214AA (SMB) package. This component operates with a reverse standoff voltage of 28.2V and provides clamping protection at 45.7V with a peak pulse current rating of 13.2A. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and field replacement requirements.

Key Parameters

Parameter	Value	Unit
Reverse Standoff Voltage (Typ)	28.2	V
Breakdown Voltage (Min)	31.4	V
Clamping Voltage (Max) @ Ipp	45.7	V
Peak Pulse Current (10/1000µs)	13.2	A
Peak Pulse Power	600	W
Package / Case	DO-214AA, SMB	—
Operating Temperature Range	-65 to 150	°C (TJ)
Type	Zener	—
Bidirectional Channels	1	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the P6SMB33CAT3 is determined by strict equivalence across the following electrical and mechanical parameters:

Reverse standoff voltage: 28.2V (typ)
Breakdown voltage minimum: 31.4V
Clamping voltage maximum: 45.7V
Peak pulse current: 13.2A nominal range (12.8A to 14.0A acceptable)
Peak pulse power: 600W
Package: DO-214AA (SMB)
Bidirectional channels: 1
Type: Zener diode
Operating temperature range: minimum -55°C to maximum 150°C

Parts meeting these criteria are classified as direct electrical equivalents. Parts with higher peak pulse current ratings (such as 1KSMB33CA at 21.9A) or different clamping voltages (such as SM6T33CA at 59V) are functional alternatives but operate outside the original specification envelope and require circuit-level validation.

Parameter Comparison

Part Number	Manufacturer	Vwm (Typ) V	Vbr (Min) V	Vc (Max) V	Ipp (10/1000µs) A	Ppk W	Temp Range °C	Package	Status	RoHS
P6SMB33CAT3	onsemi	28.2	31.4	45.7	13.2	600	-65 to 150	DO-214AA (SMB)	Obsolete	Non-compliant
P6SMB33CA	Eaton - Electronics Division	28.2	31.4	45.7	13.3	600	-55 to 150	DO-214AA (SMB)	Active	Compliant
P6SMB33CA-M3/5B	Vishay General Semiconductor - Diodes Division	28.2	31.4	45.7	13.1	600	-65 to 150	DO-214AA (SMB)	Active	Compliant
P6SMB33CA-M3/52	Vishay General Semiconductor - Diodes Division	28.2	31.4	45.7	13.1	600	-65 to 150	DO-214AA (SMB)	Active	Compliant
SM6T33CA-M3/5B	Vishay General Semiconductor - Diodes Division	28.2	31.4	45.7	13.1	600	-65 to 150	DO-214AA (SMB)	Active	Compliant
SM6T33CA-M3/52	Vishay General Semiconductor - Diodes Division	28.2	31.4	45.7	13.1	600	-65 to 150	DO-214AA (SMB)	Active	Compliant
1KSMB33CA	Taiwan Semiconductor Corporation	28.2	31.4	45.7	21.9	1000	-55 to 175	DO-214AA (SMB)	Active	Compliant
SM6T33CA	STMicroelectronics	28.2	31.4	59	68 (8/20µs)	600	-55 to 150	DO-214AA (SMB)	Active	Compliant
SM6T33CAY	STMicroelectronics	28.2	31.4	59	68 (8/20µs)	600	-55 to 150	DO-214AA (SMB)	Active	Compliant
P6SMB33CAHE3_A/H	Vishay General Semiconductor - Diodes Division	28.2	31.4	45.7	13.1	600	-65 to 150	DO-214AA (SMB)	Obsolete	Compliant

Engineering Selection Recommendations

Direct Electrical Equivalents (Preferred for Replacement)

The following parts maintain full electrical and thermal equivalence to the P6SMB33CAT3 within the specified parameter envelope:

P6SMB33CA (Eaton): Active status, RoHS compliant. Operating temperature range -55°C to 150°C. Peak pulse current 13.3A within specification tolerance.
P6SMB33CA-M3/5B (Vishay): Active status, RoHS3 compliant, AEC-Q101 qualified. Operating temperature range -65°C to 150°C matches original specification. Peak pulse current 13.1A.
P6SMB33CA-M3/52 (Vishay): Active status, RoHS3 compliant. Identical electrical parameters to P6SMB33CA-M3/5B.
SM6T33CA-M3/5B (Vishay): Active status, RoHS3 compliant. Operating temperature range -65°C to 150°C. Peak pulse current 13.1A.
SM6T33CA-M3/52 (Vishay): Active status, RoHS3 compliant. Identical electrical parameters to SM6T33CA-M3/5B.

Functional Alternatives (Higher Performance)

1KSMB33CA (Taiwan Semiconductor Corporation): Active status, RoHS3 compliant. Maintains identical voltage parameters but provides higher peak pulse current (21.9A) and peak pulse power (1000W). Operating temperature range -55°C to 175°C. Suitable for applications requiring enhanced transient suppression margin.

Functional Alternatives (Different Clamping Voltage)

SM6T33CA (STMicroelectronics): Active status, RoHS3 compliant. Maintains identical standoff and breakdown voltages but operates at higher clamping voltage (59V) with significantly higher peak pulse current (68A at 8/20µs). Suitable only where circuit design accommodates higher clamping voltage.
SM6T33CAY (STMicroelectronics): Active status, RoHS3 compliant, AEC-Q101 qualified. Identical electrical parameters to SM6T33CA with automotive-grade qualification.

Obsolete Alternatives (Not Recommended for New Designs)

P6SMB33CAHE3_A/H (Vishay): Obsolete status. RoHS3 compliant, AEC-Q101 qualified. Electrical parameters equivalent to P6SMB33CAT3 but product availability is limited.

Frequently Asked Questions (FAQ)

Q: Can P6SMB33CA from Eaton be used as a direct replacement for P6SMB33CAT3?

A: Yes. P6SMB33CA maintains identical reverse standoff voltage (28.2V), breakdown voltage (31.4V), and clamping voltage (45.7V). Peak pulse current is 13.3A, within the tolerance band of the original 13.2A specification. The part is active and RoHS compliant. The operating temperature range is -55°C to 150°C; the original part specifies -65°C to 150°C. Verify that your application does not require operation below -55°C.

Q: What is the difference between P6SMB33CA-M3/5B and P6SMB33CA-M3/52?

A: Both parts are manufactured by Vishay and maintain identical electrical specifications: 28.2V standoff voltage, 31.4V breakdown voltage, 45.7V clamping voltage, and 13.1A peak pulse current. The suffix designations (-M3/5B and -M3/52) indicate different packaging configurations or manufacturing date codes. Electrical performance is equivalent.

Q: Why do SM6T33CA and SM6T33CAY have a higher clamping voltage (59V) than the original part (45.7V)?

A: SM6T33CA and SM6T33CAY are designed with different internal structures that result in higher clamping voltage and significantly higher peak pulse current (68A at 8/20µs). These parts are functional alternatives when the circuit design can accommodate the higher clamping voltage. They provide enhanced transient suppression capability but operate outside the original specification envelope.

Q: Is 1KSMB33CA a suitable replacement?

A: 1KSMB33CA maintains identical voltage parameters (28.2V standoff, 31.4V breakdown, 45.7V clamping) but provides higher peak pulse current (21.9A) and peak pulse power (1000W). This part is suitable for applications requiring enhanced transient margin. The operating temperature range is -55°C to 175°C. Verify that your application does not require operation below -55°C.

Q: What packaging options are available for these substitute parts?

A: All substitute parts listed are available in DO-214AA (SMB) surface mount package, matching the original P6SMB33CAT3 package. Packaging configurations vary by manufacturer and supplier: Eaton offers Cut Tape (CT) & Digi-Reel®; Vishay offers Tape & Box (TB) or Tape & Reel (TR); Taiwan Semiconductor Corporation and STMicroelectronics offer Tape & Reel (TR) or Cut Tape (CT) & Digi-Reel®. Confirm packaging availability with your supplier.

Q: Are there RoHS compliance differences between substitute parts?

A: The original P6SMB33CAT3 is RoHS non-compliant. All active substitute parts listed (P6SMB33CA, P6SMB33CA-M3/5B, P6SMB33CA-M3/52, SM6T33CA-M3/5B, SM6T33CA-M3/52, 1KSMB33CA, SM6T33CA, SM6T33CAY) are RoHS3 compliant. If your application requires RoHS compliance, any of these active alternatives satisfy the requirement.

Q: Which substitute part has automotive qualification?

A: SM6T33CAY (STMicroelectronics) and P6SMB33CAHE3_A/H (Vishay) carry AEC-Q101 automotive qualification. SM6T33CAY is active and recommended for automotive applications. P6SMB33CAHE3_A/H is obsolete and not recommended for new designs.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message