P6SMB30A Equivalent & Substitute Parts

Part Overview

The P6SMB30A is an active-status transient voltage suppressor (TVS) diode manufactured by Taiwan Semiconductor Corporation. This unidirectional zener diode operates in the 25.6V reverse standoff voltage class and provides transient protection with a 41.4V maximum clamping voltage at peak pulse current. The device is packaged in the DO-214AA (SMB) surface mount configuration and is RoHS3 compliant with unlimited moisture sensitivity rating.

Equivalent and substitute parts are necessary to address supply chain availability, manufacturer-specific certifications, packaging variations, and application-specific performance requirements while maintaining electrical compatibility within defined parameter tolerances.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	25.6	V
Voltage - Breakdown (Min)	28.5	V
Voltage - Clamping (Max) @ Ipp	41.4	V
Current - Peak Pulse (10/1000µs)	15	A
Power - Peak Pulse	600	W
Operating Temperature Range	-55 to 150	°C (TJ)
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution eligibility for the P6SMB30A is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 25.6V
Voltage - Breakdown (Min): 28.5V
Voltage - Clamping (Max) @ Ipp: 41.4V (±0.1V tolerance acceptable)
Current - Peak Pulse (10/1000µs): 15A (±0.5A tolerance acceptable)
Power - Peak Pulse: 600W
Package / Case: DO-214AA or SMB equivalent
Mounting Type: Surface Mount
Type: Zener
Unidirectional Channels: 1

Secondary Compatibility Factors:

Operating Temperature Range: -55°C to 150°C minimum
RoHS Compliance Status
Moisture Sensitivity Level: 1 (Unlimited)

Parts are grouped as direct equivalents when all primary criteria are met within specified tolerances. Parts with identical electrical specifications but different manufacturers or packaging variants are classified as direct substitutes. Parts with minor deviations in peak pulse current (±0.5A) or clamping voltage (±0.1V) are classified as functional equivalents when application requirements permit such variation.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (Typ) [V]	Voltage - Breakdown (Min) [V]	Voltage - Clamping (Max) @ Ipp [V]	Current - Peak Pulse (10/1000µs) [A]	Power - Peak Pulse [W]	Operating Temperature [°C]	Package / Case	RoHS Status
P6SMB30A	Taiwan Semiconductor Corporation	25.6	28.5	41.4	15	600	-55 to 150	DO-214AA, SMB	ROHS3 Compliant
P6SMB30A	Eaton - Electronics Division	25.6	28.5	41.4	14.7	600	-55 to 150	DO-214AA, SMB	RoHS non-compliant
P6SMB30A-E3/52	Vishay General Semiconductor - Diodes Division	25.6	28.5	41.4	14.5	600	-65 to 150	DO-214AA, SMB	ROHS3 Compliant
SM6T30A-E3/52	Vishay General Semiconductor - Diodes Division	25.6	28.5	41.5	14.5	600	-65 to 150	DO-214AA, SMB	ROHS3 Compliant
SM6T30A-E3/5B	Vishay General Semiconductor - Diodes Division	25.6	28.5	41.5	14.5	600	-65 to 150	DO-214AA, SMB	ROHS3 Compliant
SMBJP6KE30A-TP	Micro Commercial Co	25.6	28.5	41.4	14.7	600	-55 to 175	DO-214AA, SMB	ROHS3 Compliant
SM6T30A	STMicroelectronics	25.6	28.5	53.5	75	600	-55 to 150	DO-214AA, SMB	ROHS3 Compliant
SM6T30AY	STMicroelectronics	25.6	28.5	53.5	75	600	-55 to 150	DO-214AA, SMB	ROHS3 Compliant
SMBJ30A	MDD	30	33.3	48.4	12.4	600	-55 to 150	DO-214AA, SMB	RoHS Compliant

Engineering Selection Recommendations

Direct Equivalents (Recommended Primary Substitutes):

The P6SMB30A-E3/52 (Vishay General Semiconductor - Diodes Division) and SM6T30A-E3/52 (Vishay General Semiconductor - Diodes Division) are direct functional equivalents. Both maintain the 25.6V reverse standoff voltage, 28.5V minimum breakdown voltage, and 600W peak pulse power rating. The clamping voltage differential of 0.1V (41.5V vs. 41.4V) and peak pulse current reduction to 14.5A fall within acceptable engineering tolerances for most applications. Both parts are RoHS3 compliant and offer extended operating temperature range to -65°C. The SM6T30A-E3/5B variant provides identical electrical specifications with alternative packaging designation.

Functional Equivalents (Application-Dependent):

The SMBJP6KE30A-TP (Micro Commercial Co) maintains electrical equivalence with 25.6V standoff voltage, 28.5V breakdown voltage, and 41.4V clamping voltage. Peak pulse current is 14.7A with extended upper operating temperature to 175°C. This part is suitable for applications requiring elevated temperature performance. RoHS3 compliance is confirmed.

The P6SMB30A from Eaton - Electronics Division provides identical electrical specifications to the Taiwan Semiconductor Corporation original part with 14.7A peak pulse current. However, this variant is RoHS non-compliant and should be selected only when RoHS compliance is not a design requirement.

Limited Compatibility (Conditional Use):

The SM6T30A and SM6T30AY (STMicroelectronics) share the 25.6V standoff voltage and 28.5V breakdown voltage but exhibit significantly higher clamping voltage (53.5V) and peak pulse current (75A at 8/20µs pulse). These parts are suitable only for applications where higher transient energy absorption and clamping voltage are acceptable or beneficial. The SM6T30AY carries automotive-grade qualification (AEC-Q101).

Not Recommended:

The SMBJ30A (MDD) exhibits a 30V reverse standoff voltage and 33.3V minimum breakdown voltage, which deviate from the P6SMB30A specification. The 48.4V clamping voltage and 12.4A peak pulse current represent significant parameter shifts. This part is not suitable as a direct substitute.

Frequently Asked Questions (FAQ)

Q: Can the P6SMB30A-E3/52 be used as a direct replacement for the P6SMB30A?

A: Yes. The P6SMB30A-E3/52 maintains identical reverse standoff voltage (25.6V), breakdown voltage (28.5V), and clamping voltage (41.4V). Peak pulse current is 14.5A compared to 15A in the original part, representing a 3.3% reduction within acceptable engineering tolerance. Both are RoHS3 compliant. The extended operating temperature range (-65°C to 150°C) provides additional margin.

Q: What is the difference between SM6T30A-E3/52 and SM6T30A-E3/5B?

A: Both parts are manufactured by Vishay General Semiconductor - Diodes Division and maintain identical electrical specifications: 25.6V standoff voltage, 28.5V breakdown voltage, 41.5V clamping voltage, and 14.5A peak pulse current. The designation suffix indicates different packaging or tape reel configurations. Selection between these variants depends on procurement and assembly requirements.

Q: Why do SM6T30A and SM6T30AY have higher clamping voltage and peak pulse current?

A: The SM6T30A and SM6T30AY are designed for higher transient energy absorption applications. The 53.5V clamping voltage and 75A peak pulse current (8/20µs) represent enhanced protection capability. These parts are suitable only when the application circuit can tolerate higher clamping voltage without component damage. The SM6T30AY includes automotive-grade qualification (AEC-Q101).

Q: Is the SMBJ30A a suitable substitute?

A: No. The SMBJ30A exhibits a 30V reverse standoff voltage and 33.3V minimum breakdown voltage, which exceed the P6SMB30A specification by 4V and 4.8V respectively. The 48.4V clamping voltage and 12.4A peak pulse current represent significant deviations. This part is not electrically compatible for direct substitution.

Q: What is the impact of the 0.1V clamping voltage difference between P6SMB30A (41.4V) and SM6T30A-E3/52 (41.5V)?

A: The 0.1V difference is negligible in practical circuit protection applications. This represents a 0.24% variation and falls within normal manufacturing tolerance for TVS diodes. Both parts provide equivalent transient suppression performance for standard circuit protection applications.

Q: Can I use the SMBJP6KE30A-TP in high-temperature applications?

A: Yes. The SMBJP6KE30A-TP operates to 175°C junction temperature, compared to 150°C for the P6SMB30A. This extended upper temperature rating makes it suitable for applications requiring elevated ambient or junction temperature operation. Electrical specifications remain equivalent.

Q: What does RoHS3 compliance mean for TVS diode selection?

A: RoHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. For applications subject to RoHS regulations, select only RoHS3-compliant variants such as P6SMB30A-E3/52, SM6T30A-E3/52, SM6T30A-E3/5B, SMBJP6KE30A-TP, SM6T30A, or SM6T30AY. The Eaton P6SMB30A variant is RoHS non-compliant and unsuitable for regulated applications.

Q: Are all substitute parts available in the same DO-214AA (SMB) package?

A: Yes. All listed substitute parts are packaged in DO-214AA or SMB equivalent surface mount configurations. Package compatibility is confirmed across all direct and functional equivalents, permitting direct PCB footprint substitution without layout modification.

Q: What is the significance of the 14.5A vs. 15A peak pulse current difference?

A: The 3.3% reduction in peak pulse current (14.5A vs. 15A) represents a minor performance variation. For most general-purpose transient protection applications, this difference is within acceptable engineering tolerance. Applications requiring maximum transient energy absorption should specify the original 15A rating or higher-current variants such as SM6T30A (75A).

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