TPSMB6.8AHE3/5BT Equivalent & Substitute Parts

Part Overview

The TPSMB6.8AHE3/5BT is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, housed in a DO-214AA (SMB) surface mount package. This component is designed for transient voltage protection applications with a reverse standoff voltage of 5.8V and peak pulse current handling of 57.1A at 10/1000µs pulse width. The part carries an Obsolete product status, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	5.8	V
Voltage - Breakdown (Min)	6.45	V
Voltage - Clamping (Max) @ Ipp	10.5	V
Current - Peak Pulse (10/1000µs)	57.1	A
Power - Peak Pulse	600	W
Operating Temperature Range	-65 to 185	°C (TJ)
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitution eligibility for the TPSMB6.8AHE3/5BT is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): 5.8V
Voltage - Breakdown (Min): 6.45V (±0.01V tolerance acceptable)
Voltage - Clamping (Max) @ Ipp: 10.5V (±0.5V tolerance acceptable)
Current - Peak Pulse (10/1000µs): ≥57.1A minimum
Power - Peak Pulse: ≥600W minimum
Package / Case: DO-214AA, SMB (mandatory)
Mounting Type: Surface Mount (mandatory)
RoHS Status: ROHS3 Compliant (mandatory)

Substitute parts are grouped into two categories:

Category A - Direct Vishay Equivalents (Same Series, Active Status): Parts P6SMB6.8A-E3/52, P6SMB6.8A-M3/52, P6SMB6.8A-M3/5B, and TPSMB6.8AHE3_A/I maintain identical electrical specifications and automotive-grade qualification. These parts differ only in packaging format (Tape & Reel vs. Tape & Box) and represent the primary replacement path for the obsolete TPSMB6.8AHE3/5BT.

Category B - Cross-Manufacturer Alternatives (Active Status): Parts 1KSMB6.8A (Littelfuse), P6SMB6.8A (Taiwan Semiconductor Corporation), SM6T6V8A, SM6T6V8AY, and SMBJ6.0A-TR (STMicroelectronics) meet the core electrical requirements but with variations in peak pulse current, clamping voltage, or operating temperature range. These parts are suitable where the primary category is unavailable.

Parameter Comparison

Part Number	Manufacturer	VWM (Typ) [V]	VBR (Min) [V]	VC (Max) @ Ipp [V]	Ipp (10/1000µs) [A]	PPP [W]	Tj Range [°C]	Package	Status	Grade
TPSMB6.8AHE3/5BT	Vishay	5.8	6.45	10.5	57.1	600	-65 to 185	DO-214AA (SMB)	Obsolete	Automotive
P6SMB6.8A-E3/52	Vishay	5.8	6.45	10.5	57.1	600	-65 to 150	DO-214AA (SMB)	Active	Industrial
P6SMB6.8A-M3/52	Vishay	5.8	6.45	10.5	57.1	600	-65 to 150	DO-214AA (SMB)	Active	Industrial
P6SMB6.8A-M3/5B	Vishay	5.8	6.45	10.5	57.1	600	-65 to 150	DO-214AA (SMB)	Active	Industrial
TPSMB6.8AHE3_A/I	Vishay	5.8	6.45	10.5	57.1	600	-65 to 185	DO-214AA (SMB)	Active	Automotive
1KSMB6.8A	Littelfuse	5.8	6.45	10.5	95.2	1000	-55 to 150	DO-214AA (SMB)	Active	Industrial
P6SMB6.8A	Taiwan Semiconductor	5.8	6.46	10.5	60	600	-55 to 150	DO-214AA (SMB)	Active	Industrial
SM6T6V8A	STMicroelectronics	5.8	6.45	13.4	298	600	-55 to 150	DO-214AA (SMB)	Active	Industrial
SM6T6V8AY	STMicroelectronics	5.8	6.45	13.4	298	600	-55 to 150	DO-214AA (SMB)	Active	Automotive
SMBJ6.0A-TR	STMicroelectronics	6.0	6.7	10.3	61	600	-55 to 150	DO-214AA (SMB)	Active	Industrial

Engineering Selection Recommendations

Primary Selection (Automotive Applications): TPSMB6.8AHE3_A/I is the recommended direct replacement for the obsolete TPSMB6.8AHE3/5BT. This part maintains identical electrical specifications, automotive-grade qualification (AEC-Q101), and extended operating temperature range (-65 to 185°C). It is the only active substitute that preserves all original design parameters and certifications.

Secondary Selection (Industrial Applications with Extended Temperature): P6SMB6.8A-E3/52, P6SMB6.8A-M3/52, or P6SMB6.8A-M3/5B are suitable for non-automotive applications where the reduced operating temperature range (-65 to 150°C) is acceptable. These parts are Vishay products with identical electrical performance and differ only in packaging format (Tape & Reel or Tape & Box).

Alternative Selection (Higher Current Capability): 1KSMB6.8A (Littelfuse) or SM6T6V8A (STMicroelectronics) provide higher peak pulse current (95.2A and 298A respectively) and power dissipation (1000W and 600W respectively), suitable for applications requiring enhanced transient protection margin. Operating temperature range is reduced to -55 to 150°C.

Marginal Substitution (Voltage Deviation): SMBJ6.0A-TR exhibits a 0.2V higher reverse standoff voltage (6.0V vs. 5.8V) and 0.2V lower clamping voltage (10.3V vs. 10.5V). This part is acceptable only where the application circuit tolerates these voltage deviations.

All substitute parts maintain ROHS3 compliance and surface mount DO-214AA (SMB) packaging compatibility.

Frequently Asked Questions (FAQ)

Q: Can TPSMB6.8AHE3_A/I be used as a direct drop-in replacement for TPSMB6.8AHE3/5BT?

A: Yes. TPSMB6.8AHE3_A/I is electrically and mechanically identical to the obsolete part, with identical reverse standoff voltage (5.8V), breakdown voltage (6.45V), clamping voltage (10.5V), peak pulse current (57.1A), and operating temperature range (-65 to 185°C). It carries the same automotive-grade qualification (AEC-Q101) and is the primary replacement.

Q: What is the difference between P6SMB6.8A-E3/52 and P6SMB6.8A-M3/52?

A: Both parts have identical electrical specifications. The difference is packaging format: P6SMB6.8A-E3/52 is supplied in Tape & Reel (TR) format, while P6SMB6.8A-M3/52 is supplied in Tape & Box (TB) format. Select based on procurement and assembly requirements.

Q: Why does 1KSMB6.8A have higher peak pulse current (95.2A vs. 57.1A)?

A: 1KSMB6.8A is designed for higher transient energy absorption (1000W vs. 600W). While it maintains the same voltage specifications, the higher current rating provides additional protection margin. It is suitable for applications where enhanced transient suppression is required.

Q: Can SM6T6V8AY be used in automotive applications?

A: Yes. SM6T6V8AY carries automotive-grade qualification (AEC-Q101) and is suitable for automotive applications. However, it exhibits a higher clamping voltage (13.4V vs. 10.5V) and significantly higher peak pulse current (298A vs. 57.1A). Use only if the application circuit tolerates these parameter deviations.

Q: Is SMBJ6.0A-TR a suitable substitute?

A: SMBJ6.0A-TR is a marginal substitute. It has a 0.2V higher reverse standoff voltage (6.0V vs. 5.8V) and 0.2V lower clamping voltage (10.3V vs. 10.5V). It is acceptable only where the application circuit design tolerates these voltage deviations. Verify circuit performance before implementation.

Q: Do all substitute parts use the same DO-214AA (SMB) package?

A: Yes. All substitute parts listed use the DO-214AA (SMB) surface mount package, ensuring mechanical and footprint compatibility with the original TPSMB6.8AHE3/5BT design.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts maintain ROHS3 compliance, meeting environmental and regulatory requirements equivalent to the original part.

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