TPSMB6.8A/1 Equivalent & Substitute Parts

Part Overview

The TPSMB6.8A/1 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates in the 5.8V reverse standoff voltage class and provides transient overvoltage protection in general-purpose applications. The part is active in production status with RoHS non-compliant classification and unlimited moisture sensitivity level (MSL 1).

Substitute parts are necessary when the original TPSMB6.8A/1 becomes unavailable due to supply constraints, inventory depletion, or manufacturing discontinuation. Equivalent components must maintain electrical compatibility across critical parameters including reverse standoff voltage, clamping voltage, and peak pulse current ratings within the DO-214AA (SMB) package form factor.

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	—
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution eligibility for the TPSMB6.8A/1 is determined by strict alignment of the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 5.8V
Voltage - Breakdown (Min): 6.45V (±0.01V tolerance acceptable)
Voltage - Clamping (Max) @ Ipp: 10.5V (±0.1V tolerance acceptable)
Package / Case: DO-214AA, SMB
Mounting Type: Surface Mount
Type: Zener
Unidirectional Channels: 1

Secondary Compatibility Parameters:

Current - Peak Pulse (10/1000µs): 57.1A minimum
Power - Peak Pulse: 600W minimum
Operating Temperature Range: Must encompass or exceed -65°C to 185°C

Substitute parts are grouped into two categories based on electrical performance:

Category A - Direct Electrical Equivalents: Parts maintaining identical clamping voltage (10.5V) and comparable peak pulse current ratings (57–95A range). These include 1KSMB6.8A, P6SMB6.8A, SMBJP6KE6.8A-TP, and SZP6SMB6.8AT3G.

Category B - Voltage-Variant Equivalents: Parts with identical reverse standoff voltage (5.8V) but different clamping voltage specifications. SMBJ6.0A-TR exhibits 6V reverse standoff with 10.3V clamping. SM6T6V8A and SM6T6V8AY operate at 5.8V reverse standoff with elevated 13.4V clamping voltage, suitable only where higher transient suppression is acceptable.

Parameter Comparison

Part Number	Manufacturer	Vwm (Typ) [V]	Vbr (Min) [V]	Vc (Max) @ Ipp [V]	Ipp (10/1000µs) [A]	Ppk [W]	Tj Range [°C]	Package	RoHS Status
TPSMB6.8A/1	Vishay	5.8	6.45	10.5	57.1	600	-65 to 185	DO-214AA	Non-compliant
1KSMB6.8A	Littelfuse	5.8	6.45	10.5	95.2	1000	-55 to 150	DO-214AA	ROHS3 Compliant
P6SMB6.8A	Taiwan Semiconductor	5.8	6.46	10.5	60	600	-55 to 150	DO-214AA	ROHS3 Compliant
SM6T6V8A	STMicroelectronics	5.8	6.45	13.4	298	600	-55 to 150	DO-214AA	ROHS3 Compliant
SM6T6V8AY	STMicroelectronics	5.8	6.45	13.4	298	600	-55 to 150	DO-214AA	ROHS3 Compliant
SMBJ6.0A-TR	STMicroelectronics	6.0	6.7	10.3	61	600	-55 to 150	DO-214AA	ROHS3 Compliant
SMBJP6KE6.8A-TP	Micro Commercial Co	5.8	6.45	10.5	58.1	600	-55 to 175	DO-214AA	ROHS3 Compliant
SZP6SMB6.8AT3G	Littelfuse	5.8	6.45	10.5	57	600	-65 to 150	DO-214AA	ROHS3 Compliant

Engineering Selection Recommendations

Recommended Primary Substitutes (Category A - Direct Equivalents):

SMBJP6KE6.8A-TP (Micro Commercial Co) – Maintains identical electrical specifications (5.8V Vwm, 10.5V Vc, 58.1A Ipp) with ROHS3 compliance and extended operating temperature range (-55 to 175°C). Highest inventory availability (210,345 pcs).
P6SMB6.8A (Taiwan Semiconductor) – Matches core electrical parameters with ROHS3 compliance. Minimal voltage deviation (6.46V breakdown vs. 6.45V). Extensive stock (39,550 pcs).
SZP6SMB6.8AT3G (Littelfuse) – Preserves original temperature range (-65 to 150°C) with ROHS3 compliance and AEC-Q101 automotive qualification. Suitable for automotive-grade applications.

Secondary Substitutes (Category B - Voltage-Variant):

1KSMB6.8A (Littelfuse) – Identical voltage specifications with superior peak pulse current (95.2A) and power rating (1kW). ROHS3 compliant. Operating temperature reduced to -55 to 150°C.
SM6T6V8AY (STMicroelectronics) – Maintains 5.8V reverse standoff with elevated 13.4V clamping voltage and AEC-Q101 automotive qualification. Suitable where higher transient suppression margin is required.

Not Recommended:

SMBJ6.0A-TR – Voltage mismatch (6.0V Vwm vs. 5.8V) creates incompatibility with circuit design specifications.

All recommended substitutes maintain DO-214AA (SMB) package compatibility and surface mount configuration. Selection should prioritize ROHS3-compliant parts for new designs. Temperature range requirements and automotive qualification status should guide final selection based on application constraints.

Frequently Asked Questions (FAQ)

Q: Can TPSMB6.8A/1 be directly replaced with any of these substitute parts?

A: Direct replacement is possible only with Category A equivalents (SMBJP6KE6.8A-TP, P6SMB6.8A, 1KSMB6.8A, SZP6SMB6.8AT3G) that maintain 5.8V reverse standoff voltage and 10.5V clamping voltage. Category B parts (SM6T6V8A, SM6T6V8AY, SMBJ6.0A-TR) have voltage deviations requiring circuit re-evaluation.

Q: What is the significance of the 10.5V clamping voltage specification?

A: Clamping voltage determines the maximum transient voltage the diode allows across the protected circuit. Deviations from 10.5V alter overvoltage protection characteristics. Higher clamping voltages (13.4V) provide less aggressive suppression; lower values (10.3V) provide tighter protection. Selection must align with downstream component voltage ratings.

Q: Why does TPSMB6.8A/1 have a wider operating temperature range (-65 to 185°C) than most substitutes (-55 to 150°C)?

A: The original part specification reflects Vishay's design envelope. Most substitute manufacturers specify -55 to 150°C, which is standard for SMB TVS diodes. Applications requiring -65°C operation should prioritize SZP6SMB6.8AT3G (Littelfuse), which extends to -65°C minimum.

Q: Are all substitute parts RoHS compliant?

A: No. TPSMB6.8A/1 is RoHS non-compliant. All listed substitutes are ROHS3 compliant, making them suitable for new designs subject to RoHS regulations. Existing designs using non-compliant parts may continue with TPSMB6.8A/1 if available.

Q: What does AEC-Q101 qualification mean?

A: AEC-Q101 is an automotive electronics qualification standard. SM6T6V8AY and SZP6SMB6.8AT3G carry this certification, indicating suitability for automotive applications with enhanced reliability and quality assurance requirements.

Q: Can I use SM6T6V8A or SM6T6V8AY as direct substitutes despite the 13.4V clamping voltage?

A: No, without circuit re-evaluation. The 13.4V clamping voltage is 2.9V higher than the original 10.5V specification. This reduces transient suppression effectiveness and may allow higher voltage transients to reach protected components. Use only if circuit design permits this voltage margin.

Q: What packaging options are available for these substitutes?

A: All substitute parts use DO-214AA (SMB) surface mount package, identical to TPSMB6.8A/1. Packaging variants (Tape & Reel, Cut Tape, Digi-Reel) affect supply format but not electrical or mechanical compatibility.

Q: Which substitute offers the best peak pulse current rating?

A: SM6T6V8A and SM6T6V8AY provide 298A peak pulse current (8/20µs pulse), significantly exceeding the original 57.1A. However, this comes with elevated clamping voltage (13.4V), requiring application-specific validation.

Q: Is inventory availability a factor in substitute selection?

A: Yes. SMBJP6KE6.8A-TP offers the highest inventory (210,345 pcs), followed by P6SMB6.8A (39,550 pcs). Limited inventory (2,400 pcs for SZP6SMB6.8AT3G) may affect lead times and cost. Verify current stock status with suppliers before final selection.

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