P6SMB39C Equivalent & Substitute Parts

Part Overview

The P6SMB39C is a bidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose overvoltage protection in surface-mount applications. This part operates with a 33.3V reverse standoff voltage and 56.6V maximum clamping voltage, delivering 11.3A peak pulse current in a DO-214AA (SMB) package. The P6SMB39C is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	33.3	V
Voltage - Breakdown (Min)	35.15	V
Voltage - Clamping (Max) @ Ipp	56.6	V
Current - Peak Pulse (10/1000µs)	11.3	A
Power - Peak Pulse	600	W
Package / Case	DO-214AA, SMB	—
Operating Temperature	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the P6SMB39C is determined by the following critical electrical and mechanical parameters:

Voltage - Reverse Standoff (Typ): Must be 33.3V or within the tolerance band of the original specification
Voltage - Clamping (Max) @ Ipp: Must not exceed 56.6V to ensure equivalent transient suppression performance
Current - Peak Pulse (10/1000µs): Must be ≥11.1A to maintain surge handling capability
Power - Peak Pulse: Must be 600W
Package / Case: Must be DO-214AA (SMB) or DO-214AA (SMBJ) for mechanical and thermal compatibility
Operating Temperature Range: Must support -55°C to 150°C minimum
RoHS Compliance: Must maintain ROHS3 compliance for regulatory alignment

Substitute parts are grouped into two categories based on clamping voltage performance: those with 53.9V clamping (tighter suppression) and those with 56.4V clamping (closer to original specification).

Parameter Comparison

Part Number	Manufacturer	Vwm (Typ) [V]	Vbr (Min) [V]	Vc (Max) [V]	Ipp [A]	Ppk [W]	Package	Temp Range [°C]	Status
P6SMB39C	Littelfuse	33.3	35.15	56.6	11.3	600	DO-214AA (SMB)	-55 to 150	Obsolete
P6SMB39C	Taiwan Semiconductor Corporation	31.6	35.1	56.4	11.1	600	DO-214AA (SMB)	-55 to 150	Active
P6SMB39CA	Meritek	33.3	37.05	53.9	11.13	600	DO-214AA (SMB)	-55 to 150	Active
P6SMB39CA-E3/52	Vishay General Semiconductor - Diodes Division	33.3	37.1	53.9	11.1	600	DO-214AA (SMB)	-65 to 150	Active
P6SMB39CA-E3/5B	Vishay General Semiconductor - Diodes Division	33.3	37.1	53.9	11.1	600	DO-214AA (SMB)	-65 to 150	Active
P6SMB39CA-M3/52	Vishay General Semiconductor - Diodes Division	33.3	37.1	53.9	11.1	600	DO-214AA (SMBJ)	-65 to 150	Active
P6SMB39CA-M3/5B	Vishay General Semiconductor - Diodes Division	33.3	37.1	53.9	11.1	600	DO-214AA (SMBJ)	-65 to 150	Active
SM6T39CA-E3/52	Vishay General Semiconductor - Diodes Division	33.3	37.1	53.9	11.1	600	DO-214AA (SMBJ)	-65 to 150	Active
SM6T39CA-E3/5B	Vishay General Semiconductor - Diodes Division	33.3	37.1	53.9	11.1	600	DO-214AA (SMBJ)	-65 to 150	Active

Engineering Selection Recommendations

Primary Substitute (Closest Match): The P6SMB39C from Taiwan Semiconductor Corporation is the most direct substitute, maintaining active product status and matching the original clamping voltage specification of 56.4V. This part preserves the electrical performance envelope of the obsolete Littelfuse component while offering current availability.

Secondary Substitutes (Tighter Clamping Performance): The P6SMB39CA series from Vishay General Semiconductor (P6SMB39CA-E3/52, P6SMB39CA-E3/5B, P6SMB39CA-M3/52, P6SMB39CA-M3/5B) and SM6T39CA series (SM6T39CA-E3/52, SM6T39CA-E3/5B) provide equivalent reverse standoff voltage (33.3V) with reduced clamping voltage (53.9V). These parts deliver tighter transient suppression and are suitable for applications where lower clamping voltage improves circuit protection margins. All Vishay variants are ROHS3 compliant and support extended operating temperature to -65°C.

Packaging Considerations:

DO-214AA (SMB) variants: P6SMB39CA-E3/52, P6SMB39CA-E3/5B
DO-214AA (SMBJ) variants: P6SMB39CA-M3/52, P6SMB39CA-M3/5B, SM6T39CA-E3/52, SM6T39CA-E3/5B

Both package styles are mechanically compatible with standard SMB footprints. The SMBJ variant provides enhanced mechanical robustness for high-vibration environments.

Compliance Status: All substitute parts maintain ROHS3 compliance. Vishay variants extend the lower operating temperature limit to -65°C, providing enhanced performance in extreme cold environments compared to the original -55°C specification.

Frequently Asked Questions (FAQ)

Q: Can I use P6SMB39CA parts as direct replacements for the obsolete P6SMB39C?

A: Yes. The P6SMB39CA series maintains the critical electrical parameters: 33.3V reverse standoff voltage, 600W peak pulse power, and ≥11.1A peak pulse current. The reduced clamping voltage (53.9V vs. 56.6V) provides tighter transient suppression, which is compatible with most circuit designs. Verify your circuit's transient voltage tolerance before substitution.

Q: What is the difference between DO-214AA (SMB) and DO-214AA (SMBJ) packages?

A: Both are surface-mount packages with identical electrical performance and footprint compatibility. The SMBJ variant features enhanced mechanical construction for improved reliability in high-vibration or thermal cycling applications. Standard SMB packages are suitable for typical industrial and consumer applications.

Q: Does the Taiwan Semiconductor Corporation P6SMB39C offer better compatibility than Vishay alternatives?

A: The Taiwan Semiconductor Corporation P6SMB39C provides the closest electrical match with 56.4V clamping voltage, nearly identical to the original 56.6V specification. However, Vishay P6SMB39CA and SM6T39CA parts with 53.9V clamping offer superior transient suppression and extended temperature range (-65°C to 150°C). Selection depends on your circuit's voltage tolerance and environmental requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, meeting regulatory requirements for hazardous substance restrictions in electronic equipment.

Q: What inventory levels are available for these substitutes?

A: Taiwan Semiconductor Corporation P6SMB39C: 1,157 pcs. Vishay P6SMB39CA-E3/5B: 1,064 pcs. Vishay SM6T39CA-E3/5B: 96,100 pcs. Meritek P6SMB39CA: 2,342 pcs. Availability varies by distributor and region.

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