P6SMBJ30 Equivalent & Substitute Parts

Part Overview

The P6SMBJ30 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., housed in a DO-214AA (SMB) surface mount package. This component is rated for 25.6V reverse standoff voltage with a 600W peak pulse power rating and 14.7A peak pulse current (10/1000µs). The part is currently classified as obsolete, necessitating identification of functionally equivalent alternatives for new designs and ongoing production support.

Substiute Parts

P6SMBJ30

Littelfuse Inc.In Stock: 978P6SMBJ30 Datasheet

Current PartRFQ

P6SMB30A

Eaton - Electronics DivisionIn Stock: 25016P6SMB30A Datasheet

MFR RecommendedRFQ

SZP6SMB30AT3G

Littelfuse Inc.In Stock: 1477SZP6SMB30AT3G Datasheet

MFR RecommendedRFQ

P6SMB30A

Eaton - Electronics DivisionIn Stock: 25016P6SMB30A Datasheet

MFR RecommendedRFQ

SM6T30A

STMicroelectronicsIn Stock: 37818SM6T30A Datasheet

MFR RecommendedRFQ

SM6T30AY

STMicroelectronicsIn Stock: 1407SM6T30AY Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the P6SMBJ30 is determined by the following critical parameters:

• Reverse standoff voltage: 25.6V (Typ)
• Breakdown voltage minimum: 27V or higher
• Unidirectional configuration: 1 channel
• Package type: DO-214AA (SMB) surface mount
• Power rating: 600W peak pulse
• Operating temperature range: -55°C to 150°C minimum

Substitute parts must maintain the same reverse standoff voltage class and unidirectional topology. Clamping voltage and peak pulse current may vary within acceptable design margins, provided the 600W power dissipation capability is preserved. All substitutes must be housed in the DO-214AA (SMB) package to ensure mechanical and thermal compatibility.

Parameter Comparison

Engineering Selection Recommendations

P6SMB30A (Eaton - Electronics Division): This part maintains electrical parity with the P6SMBJ30, offering identical reverse standoff voltage, peak pulse current, and power rating. The component is in active production status with high inventory availability (24,987 pcs). However, this substitute is RoHS non-compliant, which may restrict use in applications subject to RoHS regulations. Suitable for legacy system maintenance where RoHS compliance is not required.

SZP6SMB30AT3G (Littelfuse Inc.): This Littelfuse alternative provides ROHS3 compliance and automotive-grade qualification (AEC-Q101), with an extended operating temperature range (-65°C to 150°C). Peak pulse current is marginally lower at 14.4A versus 14.7A, and clamping voltage is reduced to 41.4V. This part is recommended for automotive applications and designs requiring enhanced temperature performance and regulatory compliance. Inventory availability is moderate (1,380 pcs).

SM6T30A and SM6T30AY (STMicroelectronics): Both STMicroelectronics variants feature significantly higher peak pulse current (75A at 8/20µs) and elevated clamping voltage (54.6V) compared to the P6SMBJ30. These parts maintain ROHS3 compliance and the standard operating temperature range. SM6T30AY includes automotive qualification (AEC-Q101). These substitutes are suitable for applications requiring enhanced transient suppression capability. High inventory availability (37,800 pcs for SM6T30A; 1,394 pcs for SM6T30AY).

Frequently Asked Questions (FAQ)

Q: Can the P6SMB30A be used as a direct replacement for the P6SMBJ30?

A: Yes, electrically and mechanically. Both parts share identical reverse standoff voltage (25.6V), peak pulse current (14.7A), and power rating (600W) in the same DO-214AA (SMB) package. The primary consideration is RoHS compliance; the P6SMB30A is RoHS non-compliant, whereas the P6SMBJ30 is ROHS3 compliant.

Q: What is the difference between the Littelfuse SZP6SMB30AT3G and the original P6SMBJ30?

A: The SZP6SMB30AT3G is the active-production equivalent from Littelfuse. It maintains ROHS3 compliance and adds automotive qualification (AEC-Q101). The peak pulse current is slightly lower (14.4A vs. 14.7A), and clamping voltage is reduced to 41.4V. The operating temperature range extends to -65°C, providing improved low-temperature performance.

Q: Why do the STMicroelectronics SM6T30A and SM6T30AY have higher peak pulse current ratings?

A: These parts employ a different internal design optimized for higher transient current handling (75A at 8/20µs pulse width). While they maintain the same 25.6V reverse standoff voltage and 600W power rating, the elevated clamping voltage (54.6V) reflects this enhanced capability. Selection depends on whether the application requires this additional transient suppression margin.

Q: Are all substitute parts available in the same packaging format?

A: Yes. All listed substitutes are housed in the DO-214AA (SMB) surface mount package, ensuring mechanical and thermal compatibility with the P6SMBJ30. Packaging options vary by manufacturer (Cut Tape, Digi-Reel, or Tape & Reel), but the component footprint and thermal characteristics remain consistent.

Q: Which substitute is recommended for new automotive designs?

A: The SZP6SMB30AT3G (Littelfuse) or SM6T30AY (STMicroelectronics) are both suitable. Both include AEC-Q101 automotive qualification and ROHS3 compliance. The SZP6SMB30AT3G maintains closer electrical parity to the original part, while the SM6T30AY offers enhanced transient suppression capability if required by the application.

Q: What is the impact of the lower clamping voltage in the SZP6SMB30AT3G?

A: The reduction from 43.47V to 41.4V represents tighter voltage clamping during transient events. This is generally beneficial for circuit protection, as it limits the peak voltage stress on downstream components. This change is within normal design margins for 25.6V standoff voltage class TVS diodes.