TPSMB39CA Equivalent & Substitute Parts

Part Overview

The TPSMB39CA is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., classified as a Zener-type bidirectional TVS device in the DO-214AA (SMB) surface mount package. This component is designed for transient voltage protection applications and carries active product status with AEC-Q101 automotive qualification. Equivalent and substitute parts are identified based on matching electrical characteristics, package compatibility, and operational parameters to ensure functional interchangeability in circuit protection applications.

Substiute Parts

TPSMB39CA

Littelfuse Inc.In Stock: 65195TPSMB39CA Datasheet

Current PartRFQ

P6SMB39CA

MeritekIn Stock: 2432P6SMB39CA Datasheet

DirectRFQ

SZP6SMB39CAT3G

Littelfuse Inc.In Stock: 2560SZP6SMB39CAT3G Datasheet

MFR RecommendedRFQ

P6SMB39CA

MeritekIn Stock: 2432P6SMB39CA Datasheet

DirectRFQ

SM6T39CAY

STMicroelectronicsIn Stock: 30412SM6T39CAY Datasheet

DirectRFQ

SMBJP6KE39CA-TP

Micro Commercial CoIn Stock: 4620SMBJP6KE39CA-TP Datasheet

DirectRFQ

P6SMB39CA_R1_00001

Panjit International Inc.In Stock: 1631P6SMB39CA_R1_00001 Datasheet

MFR RecommendedRFQ

SM6T39CA

STMicroelectronicsIn Stock: 75368SM6T39CA Datasheet

MFR RecommendedRFQ

SM6T39CA-E3/52

Vishay General Semiconductor - Diodes DivisionIn Stock: 2177SM6T39CA-E3/52 Datasheet

MFR RecommendedRFQ

SM6T39CA-E3/5B

Vishay General Semiconductor - Diodes DivisionIn Stock: 96148SM6T39CA-E3/5B Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TPSMB39CA are grouped based on the following electrical and mechanical criteria:

Primary Substitution Criteria:

• Voltage - Reverse Standoff (Typ): 33.3V
• Voltage - Clamping (Max) @ Ipp: 53.9V
• Package / Case: DO-214AA (SMB)
• Mounting Type: Surface Mount
• Bidirectional Channels: 1
• Type: Zener

Substitution Groups:

Group 1: Direct Electrical & Thermal Equivalents (53.9V Clamp) Parts with matching 53.9V clamping voltage, 33.3V standoff voltage, and compatible operating temperature ranges. These provide direct functional replacement with minimal circuit impact.

Group 2: Higher Clamping Voltage Variants (69.7V Clamp) Parts with elevated clamping voltage (69.7V) while maintaining the same 33.3V standoff voltage. These provide increased transient energy absorption but require circuit validation for voltage margin compatibility.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Automotive-Qualified Applications): SZP6SMB39CAT3G (Littelfuse Inc.) is the manufacturer-recommended equivalent. It maintains AEC-Q101 qualification, identical voltage specifications (33.3V standoff, 53.9V clamp), and compatible operating temperature range (-65°C to 150°C). This part is suitable for automotive and mission-critical applications requiring maintained qualification status.

For Direct Replacement (General Purpose Applications): SMBJP6KE39CA-TP (Micro Commercial Co) provides electrical equivalence with matching 53.9V clamping voltage and 11.3A peak pulse current. Operating temperature range extends to 175°C, matching the original TPSMB39CA specification. This part is suitable for applications where automotive qualification is not required.

For Higher Energy Absorption Applications: SM6T39CA or SM6T39CAY (STMicroelectronics) offer elevated clamping voltage (69.7V) with significantly higher peak pulse current (57A at 8/20µs). These parts are suitable only when circuit design permits higher clamping voltage and increased transient energy absorption is required. AEC-Q101 qualification is maintained for SM6T39CAY.

For Extended Temperature Range: TPSMB39CA and SZP6SMB39CAT3G both support -65°C lower operating limit. Parts from Meritek, Panjit, and Micro Commercial Co operate to -55°C minimum, which may be limiting in extreme cold environments.

Frequently Asked Questions (FAQ)

Q: Can SM6T39CA (69.7V clamp) be used as a direct substitute for TPSMB39CA (53.9V clamp)? A: No. While both parts share the same 33.3V standoff voltage and DO-214AA package, the higher clamping voltage (69.7V vs 53.9V) will allow higher transient voltages to reach the protected circuit. Circuit validation is required to confirm the protected device can tolerate this voltage differential.

Q: What is the difference between SMBJP6KE39CA-TP and P6SMB39CA? A: Both parts have identical electrical specifications (33.3V standoff, 53.9V clamp, 11.3A/11.13A peak pulse). The primary difference is operating temperature range: SMBJP6KE39CA-TP operates to 175°C while P6SMB39CA operates to 150°C. SMBJP6KE39CA-TP is preferred for high-temperature applications.

Q: Is AEC-Q101 qualification required for my application? A: AEC-Q101 qualification is mandatory for automotive and safety-critical applications. TPSMB39CA, SZP6SMB39CAT3G, and SM6T39CAY carry this qualification. Other listed parts do not and are suitable only for general-purpose industrial and consumer applications.

Q: Do all substitute parts use the same DO-214AA package? A: Yes. All listed substitute parts use DO-214AA (SMB) surface mount package with identical footprint and land pattern compatibility. No PCB layout modifications are required for mechanical substitution.

Q: What is the difference between SM6T39CA-E3/52 and SM6T39CA-E3/5B? A: Both parts are manufactured by Vishay and have identical electrical specifications (33.3V standoff, 53.9V clamp, 11.1A peak pulse). The suffix designations (-E3/52 vs -E3/5B) indicate different packaging or tape configurations. Electrical performance is equivalent.

Q: Can I substitute based on peak pulse current alone? A: No. Peak pulse current is one parameter among several. Voltage specifications (standoff and clamping) are the primary substitution criteria. Parts with different clamping voltages (such as SM6T39CA at 69.7V) require full circuit analysis before substitution.