P6SMBJ33A Equivalent & Substitute Parts

Part Overview

The P6SMBJ33A is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse, rated for 33V protection with 600W peak pulse power in a surface mount DO-214AA (SMB) package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

TVS diodes in this category are used for transient voltage suppression in general-purpose applications. The P6SMBJ33A specifications establish the baseline for identifying compatible alternatives from active manufacturers.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	28.2	V
Voltage - Breakdown (Min)	31.4	V
Voltage - Clamping (Max) @ Ipp	45.7	V
Current - Peak Pulse (10/1000µs)	13.3	A
Power - Peak Pulse	600	W
Operating Temperature Range	-55°C ~ 150°C	TJ
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the P6SMBJ33A are identified based on strict electrical and mechanical parameter matching:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 28.2V
Voltage - Breakdown (Min): 31.4V
Voltage - Clamping (Max) @ Ipp: 45.7V (±tolerance acceptable)
Current - Peak Pulse (10/1000µs): 13.1A to 13.3A
Power - Peak Pulse: 600W
Package / Case: DO-214AA, SMB
Mounting Type: Surface Mount
Type: Zener, Unidirectional (1 channel)
RoHS Status: ROHS3 Compliant or equivalent

Parts are grouped into two categories:

Group A - Direct Electrical Equivalents (Clamping Voltage 45.7V): These parts maintain identical clamping voltage and current specifications, ensuring drop-in compatibility.

Group B - Functional Equivalents with Parameter Variance (Clamping Voltage 59V): These parts share the same standoff and breakdown voltages but exhibit higher clamping voltage and peak pulse current under different test conditions (8/20µs vs. 10/1000µs). These are functionally compatible but require circuit-level validation.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse	Power - Peak Pulse	Operating Temperature	Package	RoHS Status
P6SMBJ33A	Littelfuse	Obsolete	28.2V	31.4V	45.7V	13.3A (10/1000µs)	600W	-55°C ~ 150°C	DO-214AA, SMB	ROHS3 Compliant
TPSMB33A	Littelfuse Inc.	Active	28.2V	31.4V	45.7V	13.3A (10/1000µs)	600W	-65°C ~ 175°C	DO-214AA, SMB	ROHS3 Compliant
SZP6SMB33AT3G	Littelfuse Inc.	Active	28.2V	31.4V	45.7V	13.2A (10/1000µs)	600W	-65°C ~ 150°C	DO-214AA, SMB	ROHS3 Compliant
SMBJP6KE33A-TP	Micro Commercial Co	Active	28.2V	31.4V	45.7V	13.3A (10/1000µs)	600W	-55°C ~ 175°C	DO-214AA, SMB	ROHS3 Compliant
P6SMB33A	Eaton - Electronics Division	Active	28.2V	31.4V	45.7V	13.3A (10/1000µs)	600W	-55°C ~ 150°C	DO-214AA, SMB	RoHS Compliant
SM6T33A	STMicroelectronics	Active	28.2V	31.4V	59V	68A (8/20µs)	600W	-55°C ~ 150°C	DO-214AA, SMB	ROHS3 Compliant
SM6T33A-E3/52	Vishay General Semiconductor - Diodes Division	Active	28.2V	31.4V	45.7V	13.1A (10/1000µs)	600W	-65°C ~ 150°C	DO-214AA, SMB	ROHS3 Compliant
SM6T33A-E3/5B	Vishay General Semiconductor - Diodes Division	Active	28.2V	31.4V	45.7V	13.1A (10/1000µs)	600W	-65°C ~ 150°C	DO-214AA, SMB	ROHS3 Compliant
SM6T33AY	STMicroelectronics	Active	28.2V	31.4V	59V	68A (8/20µs)	600W	-55°C ~ 150°C	DO-214AA, SMB	ROHS3 Compliant

Engineering Selection Recommendations

Tier 1 - Direct Replacements (Recommended for Immediate Substitution):

TPSMB33A, SZP6SMB33AT3G, SMBJP6KE33A-TP, P6SMB33A, SM6T33A-E3/52, and SM6T33A-E3/5B maintain electrical specifications within acceptable tolerance of the P6SMBJ33A. All are active products with ROHS3 compliance or equivalent RoHS certification. These parts are suitable for direct substitution without circuit modification.

TPSMB33A (Littelfuse Inc.) offers the closest match with identical manufacturer lineage, active product status, and extended operating temperature range (-65°C ~ 175°C). This part is available in high volume (3895 Pcs).

SZP6SMB33AT3G (Littelfuse Inc.) provides the highest inventory availability (33212 Pcs) and maintains all critical electrical parameters with 13.2A peak pulse current specification.

Tier 2 - Functional Equivalents (Conditional Substitution):

SM6T33A and SM6T33AY (STMicroelectronics) exhibit higher clamping voltage (59V) and peak pulse current (68A at 8/20µs test condition) compared to the P6SMBJ33A specification (45.7V, 13.3A at 10/1000µs). These parts share identical standoff and breakdown voltages but operate at different transient response characteristics. Use only when circuit design accommodates higher clamping voltage.

Compliance Considerations:

All recommended substitutes maintain ROHS3 compliance or equivalent RoHS certification. Moisture Sensitivity Level (MSL) is 1 (Unlimited) across all alternatives, matching the original specification. REACH status is unaffected for all active alternatives.

Frequently Asked Questions (FAQ)

Q: Can I use SM6T33A or SM6T33AY as direct replacements for P6SMBJ33A?

A: SM6T33A and SM6T33AY are functionally compatible but not direct electrical equivalents. These parts exhibit 59V clamping voltage versus the P6SMBJ33A's 45.7V specification. They are suitable only if your circuit design accommodates the higher clamping voltage. The peak pulse current specification differs due to different test conditions (8/20µs vs. 10/1000µs).

Q: What is the difference between TPSMB33A and SZP6SMB33AT3G?

A: Both are Littelfuse products with identical electrical specifications (28.2V standoff, 31.4V breakdown, 45.7V clamping, 600W power). TPSMB33A is supplied in Cut Tape (CT) & Digi-Reel® packaging with operating temperature -65°C ~ 175°C. SZP6SMB33AT3G is supplied in Tape & Reel (TR) packaging with operating temperature -65°C ~ 150°C. Select based on packaging requirements and temperature range needs.

Q: Are all substitute parts RoHS compliant?

A: Yes. All active substitute parts listed maintain ROHS3 compliance or equivalent RoHS certification status. The original P6SMBJ33A is ROHS3 compliant, and all alternatives meet or exceed this standard.

Q: What is the operating temperature range difference between P6SMBJ33A and its substitutes?

A: The P6SMBJ33A operates from -55°C ~ 150°C. Several substitutes extend this range: TPSMB33A and SMBJP6KE33A-TP support -65°C ~ 175°C, while SZP6SMB33AT3G supports -65°C ~ 150°C. SM6T33A-E3/52 and SM6T33A-E3/5B support -65°C ~ 150°C. Select based on your application's thermal requirements.

Q: Can I mix different manufacturers' parts in the same design?

A: Yes. All substitute parts maintain identical electrical specifications within acceptable tolerance. However, verify packaging and lead-forming specifications with your assembly partner, as minor variations between manufacturers may affect pick-and-place equipment settings.

Q: What does MSL 1 (Unlimited) mean?

A: Moisture Sensitivity Level 1 (Unlimited) indicates the component has no moisture sensitivity restrictions. These parts can be stored indefinitely without special moisture control measures, matching the P6SMBJ33A specification.

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