P6SMB43AT3G Equivalent & Substitute Parts

Part Overview

The P6SMB43AT3G is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 36.8V reverse standoff voltage with a 59.3V clamping voltage at peak pulse current, housed in a DO-214AA (SMB) package. The part is currently listed as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for new designs or production continuity.

Substiute Parts

P6SMB43AT3G

Littelfuse Inc.In Stock: 5237P6SMB43AT3G Datasheet

Current PartRFQ

1KSMB43A

Taiwan Semiconductor CorporationIn Stock: 421771KSMB43A Datasheet

MFR RecommendedRFQ

P6SMB43A

Eaton - Electronics DivisionIn Stock: 148264P6SMB43A Datasheet

MFR RecommendedRFQ

SMBJ43A

MeritekIn Stock: 15892SMBJ43A Datasheet

MFR RecommendedRFQ

TPSMB43A

Littelfuse Inc.In Stock: 3334TPSMB43A Datasheet

MFR RecommendedRFQ

P6SMB43A

Eaton - Electronics DivisionIn Stock: 148264P6SMB43A Datasheet

MFR RecommendedRFQ

SMBJP6KE43A-TP

Micro Commercial CoIn Stock: 1107SMBJP6KE43A-TP Datasheet

MFR RecommendedRFQ

TVP06B430A-G

Comchip TechnologyIn Stock: 1070TVP06B430A-G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P6SMB43AT3G is determined by strict equivalence across the following electrical and mechanical parameters:

• Voltage - Reverse Standoff (Typ): 36.8V
• Voltage - Clamping (Max) @ Ipp: 59.3V
• Package / Case: DO-214AA (SMB)
• Unidirectional Channels: 1
• Type: Zener diode
• RoHS3 Compliance

Substitute parts must maintain identical reverse standoff and clamping voltage specifications to ensure circuit protection performance. Peak pulse current and power dissipation may vary within acceptable design margins provided the part remains rated for surface-mount SMB packaging. All identified substitutes are active products with current manufacturing status, ensuring long-term availability and supply chain continuity.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Full Electrical Equivalence):

1KSMB43A, P6SMB43A, TPSMB43A, and SMBJP6KE43A-TP maintain identical reverse standoff (36.8V) and clamping voltage (59.3V) specifications as the P6SMB43AT3G. These parts are all active products with ROHS3 compliance and are suitable for direct replacement in new designs or production transitions.

1KSMB43A offers enhanced performance with 16.9A peak pulse current and 1000W power dissipation, providing design margin improvement over the original 11.1A / 600W specification. Operating temperature range extends to 175°C, supporting higher ambient applications.

P6SMB43A (Eaton) and SMBJP6KE43A-TP (Micro Commercial Co) maintain the original 600W power rating with 10.3A peak pulse current, providing near-identical performance characteristics. Both are actively manufactured with broad availability.

TPSMB43A (Littelfuse Inc.) is the manufacturer's active replacement, featuring automotive-grade qualification (AEC-Q101) and extended temperature range (-65°C to 175°C), suitable for automotive and industrial applications requiring higher reliability standards.

Secondary Substitute (Voltage Deviation):

SMBJ43A (Meritek) deviates from the primary specification with 43V reverse standoff and 69.4V clamping voltage. This part is not electrically equivalent and should only be considered if circuit design permits higher voltage thresholds.

TVP06B430A-G (Comchip Technology) lacks complete electrical parameter documentation and is not recommended for direct substitution without verification of voltage specifications against design requirements.

Frequently Asked Questions (FAQ)

Q: Can I use 1KSMB43A as a direct replacement for P6SMB43AT3G?

A: Yes. The 1KSMB43A maintains identical reverse standoff (36.8V) and clamping voltage (59.3V) specifications. The higher peak pulse current (16.9A vs. 11.1A) and power rating (1000W vs. 600W) provide additional design margin without affecting circuit protection performance. Both use DO-214AA (SMB) packaging.

Q: What is the difference between P6SMB43A and TPSMB43A?

A: Both maintain identical electrical specifications (36.8V standoff, 59.3V clamping, 10.3A peak pulse). TPSMB43A includes automotive-grade qualification (AEC-Q101) and extends the operating temperature range to 175°C, making it suitable for automotive and high-reliability applications. P6SMB43A is optimized for telecom applications.

Q: Why is SMBJ43A listed as a substitute if the voltage is different?

A: SMBJ43A is not an electrical equivalent. It features 43V reverse standoff and 69.4V clamping voltage, which deviate from the original 36.8V / 59.3V specification. This part should only be used if circuit design requirements permit higher voltage thresholds.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All active substitute parts listed (1KSMB43A, P6SMB43A, TPSMB43A, SMBJP6KE43A-TP, and SMBJ43A) are ROHS3 compliant, meeting environmental and regulatory requirements for modern electronics manufacturing.

Q: What packaging considerations apply to these substitutes?

A: All substitute parts use DO-214AA (SMB) surface-mount packaging, identical to the original P6SMB43AT3G. No PCB layout or footprint modifications are required for direct substitution.

Q: Is TVP06B430A-G a suitable replacement?

A: TVP06B430A-G is not recommended without verification. Complete electrical parameter data (reverse standoff, breakdown, and clamping voltages) is not provided. Confirmation of voltage specifications against design requirements is necessary before use.