P6SMB27C Equivalent & Substitute Parts

Part Overview

The P6SMB27C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This bidirectional zener diode features a 23.1V reverse standoff voltage and 39.38V clamping voltage with 16.3A peak pulse current capability in a DO-214AA (SMB) package. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and component procurement.

Substiute Parts

P6SMB27C

Littelfuse Inc.In Stock: 897P6SMB27C Datasheet

Current PartRFQ

P6SMB27CA

Eaton - Electronics DivisionIn Stock: 30388P6SMB27CA Datasheet

DirectRFQ

SZP6SMB27CAT3G

Littelfuse Inc.In Stock: 3380SZP6SMB27CAT3G Datasheet

MFR RecommendedRFQ

P6SMB27CA

Eaton - Electronics DivisionIn Stock: 30388P6SMB27CA Datasheet

DirectRFQ

SM6T27CA

STMicroelectronicsIn Stock: 14509SM6T27CA Datasheet

MFR RecommendedRFQ

SM6T27CA-E3/52

Vishay General Semiconductor - Diodes DivisionIn Stock: 5788SM6T27CA-E3/52 Datasheet

MFR RecommendedRFQ

SM6T27CA-E3/5B

Vishay General Semiconductor - Diodes DivisionIn Stock: 4424SM6T27CA-E3/5B Datasheet

MFR RecommendedRFQ

SM6T27CAY

STMicroelectronicsIn Stock: 2212SM6T27CAY Datasheet

MFR RecommendedRFQ

SMBJP6KE27CA-TP

Micro Commercial CoIn Stock: 6768SMBJP6KE27CA-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P6SMB27C is determined by the following critical electrical and mechanical parameters:

Core Substitution Criteria:

• Reverse standoff voltage: 23.1V (Typ)
• Breakdown voltage minimum: 24.35V or higher
• Clamping voltage: 37.5V to 39.38V @ Ipp
• Peak pulse current: 16A to 16.3A (10/1000µs)
• Power dissipation: 600W peak pulse
• Package: DO-214AA / SMB (surface mount)
• Bidirectional zener type

Substitute parts are grouped into two categories based on clamping voltage performance:

Group A - Matched Clamping Voltage (37.5V): Parts with 37.5V clamping voltage provide the closest electrical match to the original P6SMB27C specification, with equivalent peak pulse current ratings of 16A to 16.3A.

Group B - Higher Clamping Voltage (48.3V): Parts with 48.3V clamping voltage operate at a higher transient suppression level but maintain the same reverse standoff voltage and package compatibility. These are suitable where higher voltage transient tolerance is acceptable.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Closest Electrical Match):

P6SMB27CA (Eaton), SM6T27CA-E3/52 (Vishay), SM6T27CA-E3/5B (Vishay), and SMBJP6KE27CA-TP (Micro Commercial Co) provide direct electrical equivalence with 37.5V clamping voltage and 16A to 16.3A peak pulse current. All are active products with ROHS3 compliance. The Eaton P6SMB27CA offers the highest inventory availability (30,300 pcs). Vishay parts provide extended operating temperature range (-65°C to 150°C) and are qualified to ROHS3. The Micro Commercial Co SMBJP6KE27CA-TP extends the upper operating temperature to 175°C.

Secondary Substitutes (Higher Clamping Voltage):

SM6T27CA and SM6T27CAY (STMicroelectronics) feature 48.3V clamping voltage with significantly higher peak pulse current (83A at 8/20µs). These are suitable for applications requiring enhanced transient suppression margin. SM6T27CAY carries automotive-grade qualification (AEC-Q101). Both maintain the 23.1V reverse standoff voltage and 600W peak pulse power rating.

Littelfuse Automotive Alternative:

SZP6SMB27CAT3G (Littelfuse Inc.) provides a direct Littelfuse equivalent with automotive-grade qualification (AEC-Q101), 37.5V clamping voltage, and extended lower temperature rating (-65°C). This option maintains manufacturer continuity for designs requiring Littelfuse components.

Frequently Asked Questions (FAQ)

Q: Can I use SM6T27CA or SM6T27CAY as direct replacements for P6SMB27C?

A: These parts share the same 23.1V reverse standoff voltage and DO-214AA package, but feature 48.3V clamping voltage compared to the P6SMB27C's 39.38V. They are electrically compatible for general overvoltage protection but will suppress transients at a higher voltage threshold. Use only if your circuit design tolerates this higher clamping voltage.

Q: What is the difference between the Vishay SM6T27CA-E3/52 and SM6T27CA-E3/5B?

A: Both parts are electrically identical with 23.1V reverse standoff, 37.5V clamping voltage, and 16A peak pulse current. The difference is in packaging designation (E3/52 vs. E3/5B), which reflects different tape and reel configurations. Select based on your assembly equipment compatibility.

Q: Does the extended temperature range of SZP6SMB27CAT3G (-65°C to 150°C) affect performance?

A: The extended lower temperature rating provides additional operational margin in cold environments. Electrical performance at the specified parameters remains consistent across the rated temperature range. This is beneficial for applications in extreme temperature conditions.

Q: Why do some substitutes have different peak pulse current ratings?

A: The STMicroelectronics SM6T27CA and SM6T27CAY specify 83A peak pulse current at 8/20µs pulse duration, while the P6SMB27C specifies 16.3A at 10/1000µs. These represent different pulse waveform standards. The 8/20µs waveform is more stringent and reflects higher current capability under that specific test condition. Both maintain 600W peak pulse power dissipation.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: Which substitute offers the best inventory availability?

A: The Eaton P6SMB27CA provides the highest stock level at 30,300 pcs, followed by STMicroelectronics SM6T27CA at 14,481 pcs. Availability should be verified with your component supplier for current stock status.