P6SMB39AT3G Equivalent & Substitute Parts

Part Overview

The P6SMB39AT3G is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., classified as a unidirectional Zener-type device in the SMB package (DO-214AA). This component is designed for general-purpose transient voltage suppression applications with a reverse standoff voltage of 33.3V and peak pulse current rating of 11.2A at 600W peak pulse power.

The P6SMB39AT3G is currently listed as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs, repairs, and system upgrades.

Key Parameters

Parameter	Value
Manufacturer Part Number	P6SMB39AT3G
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener, Unidirectional
Voltage - Reverse Standoff (Typ)	33.3V
Voltage - Breakdown (Min)	37.1V
Voltage - Clamping (Max) @ Ipp	53.9V
Current - Peak Pulse (10/1000µs)	11.2A
Power - Peak Pulse	600W
Package / Case	DO-214AA, SMB
Operating Temperature	-65°C ~ 150°C (TJ)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the P6SMB39AT3G is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): 33.3V ± tolerance
Voltage - Clamping (Max) @ Ipp: 53.9V ± tolerance
Current - Peak Pulse (10/1000µs): minimum 11.2A
Power - Peak Pulse: minimum 600W
Package / Case: DO-214AA or SMB equivalent
Mounting Type: Surface Mount
Type: Zener, Unidirectional

Substitute parts are grouped into two categories:

Direct Electrical Equivalents: Parts with identical or near-identical voltage ratings, clamping characteristics, and current ratings. These parts maintain the same functional performance envelope as the original component.

Functional Equivalents with Enhanced Ratings: Parts that exceed the original specifications in peak pulse current or power dissipation while maintaining compatible voltage characteristics. These parts provide superior transient suppression capability within the same package footprint.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package	Operating Temperature	Product Status
P6SMB39AT3G	Littelfuse Inc.	33.3V	53.9V	11.2A	600W	DO-214AA, SMB	-65°C ~ 150°C	Obsolete
P6SMB39A	Eaton - Electronics Division	33.3V	53.9V	11.3A	600W	DO-214AA, SMB	-55°C ~ 150°C	Active
1KSMB39A	Taiwan Semiconductor Corporation	33.3V	53.9V	18.6A	1000W	DO-214AA, SMB	-55°C ~ 175°C	Active
TPSMB39A	Littelfuse Inc.	33.3V	53.9V	11.3A	600W	DO-214AA, SMB	-65°C ~ 175°C	Active
SM6T39A-M3/52	Vishay General Semiconductor - Diodes Division	33.3V	53.9V	11.1A	600W	DO-214AA, SMB	-65°C ~ 150°C	Active
SM6T39A-M3/5B	Vishay General Semiconductor - Diodes Division	33.3V	53.9V	11.1A	600W	DO-214AA, SMB	-65°C ~ 150°C	Active
SM6T39A	STMicroelectronics	33.3V	69.7V	57A (8/20µs)	600W	DO-214AA, SMB	-55°C ~ 150°C	Active
SM6T39AY	STMicroelectronics	33.3V	69.7V	57A (8/20µs)	600W	DO-214AA, SMB	-55°C ~ 150°C	Active
SMBJP6KE39A-TP	Micro Commercial Co	33.3V	53.9V	11.3A	600W	DO-214AA, SMB	-55°C ~ 175°C	Active
SMBJ36A	EVVO Semi	36V	58.1V	10.4A	600W	DO-214AC, SMA	-65°C ~ 150°C	Active

Engineering Selection Recommendations

Primary Substitutes (Direct Electrical Equivalents):

P6SMB39A (Eaton), SM6T39A-M3/52 (Vishay), SM6T39A-M3/5B (Vishay), and SMBJP6KE39A-TP (Micro Commercial Co) are direct electrical equivalents with matching voltage ratings (33.3V standoff, 53.9V clamping) and comparable current ratings (11.1A to 11.3A). All are active products with ROHS3 compliance. P6SMB39A and SMBJP6KE39A-TP extend the upper operating temperature to 175°C, providing enhanced thermal margin for high-temperature applications.

Enhanced Performance Substitute:

1KSMB39A (Taiwan Semiconductor Corporation) maintains identical voltage characteristics while providing significantly higher peak pulse current (18.6A) and power dissipation (1000W). This part is suitable for applications requiring greater transient suppression margin. Operating temperature range extends to 175°C.

Automotive-Grade Substitute:

TPSMB39A (Littelfuse Inc.) is qualified to AEC-Q101 automotive standards with a -65°C to 175°C operating range, making it suitable for automotive and harsh-environment applications requiring component-level reliability certification.

Alternative Voltage Rating:

SMBJ36A (EVVO Semi) operates at a higher reverse standoff voltage (36V) and clamping voltage (58.1V). This part is suitable only for applications where the higher voltage threshold is acceptable. Note the package variant is DO-214AC (SMA) rather than DO-214AA (SMB).

Not Recommended for Direct Substitution:

SM6T39A and SM6T39AY (STMicroelectronics) exhibit significantly higher clamping voltage (69.7V) and peak pulse current (57A at 8/20µs pulse width). These parts are suitable only for applications specifically designed for higher clamping voltage characteristics and should not be used as drop-in replacements without circuit re-evaluation.

Frequently Asked Questions (FAQ)

Q: Can P6SMB39A be used as a direct replacement for P6SMB39AT3G?

A: Yes. P6SMB39A maintains identical voltage ratings (33.3V standoff, 53.9V clamping) and comparable peak pulse current (11.3A vs. 11.2A). Both are rated for 600W peak pulse power in the DO-214AA SMB package. The primary difference is product status (active vs. obsolete) and operating temperature range (-55°C to 150°C vs. -65°C to 150°C).

Q: What is the difference between SM6T39A-M3/52 and SM6T39A-M3/5B?

A: Both parts are manufactured by Vishay and share identical electrical specifications (33.3V standoff, 53.9V clamping, 11.1A peak pulse current, 600W power). The suffix designations (-M3/52 and -M3/5B) indicate different tape and reel packaging configurations. Electrical performance is equivalent; selection depends on packaging and supply chain requirements.

Q: Why do SM6T39A and SM6T39AY have higher clamping voltages (69.7V)?

A: SM6T39A and SM6T39AY are designed with different internal characteristics that result in higher clamping voltage while maintaining the same 33.3V reverse standoff voltage. These parts are not direct replacements and should only be used if the circuit design specifically accommodates the higher clamping voltage threshold.

Q: Is 1KSMB39A suitable for all applications using P6SMB39AT3G?

A: 1KSMB39A is electrically compatible with identical voltage ratings but provides enhanced current handling (18.6A vs. 11.2A) and power dissipation (1000W vs. 600W). It is suitable for applications requiring greater transient suppression capability. No circuit modification is required for substitution.

Q: Can SMBJ36A replace P6SMB39AT3G?

A: SMBJ36A is not a direct replacement. It operates at a higher reverse standoff voltage (36V vs. 33.3V) and clamping voltage (58.1V vs. 53.9V). Additionally, the package is DO-214AC (SMA) rather than DO-214AA (SMB), requiring PCB layout modification. Use only if the application circuit is designed for the higher voltage threshold.

Q: What does AEC-Q101 qualification mean for TPSMB39A?

A: AEC-Q101 is an automotive industry standard qualification for discrete semiconductors. TPSMB39A meets this qualification, indicating it has undergone rigorous testing for reliability, temperature cycling, and performance consistency. This part is suitable for automotive applications and systems requiring component-level reliability certification.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant, meeting the Restriction of Hazardous Substances directive requirements for lead-free and restricted substance content.

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