SZP6SMB39CAT3G Equivalent & Substitute Parts

Part Overview

The SZP6SMB39CAT3G is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for surface mount applications in the SMB (DO-214AA) package. This bidirectional Zener-type TVS diode operates with a reverse standoff voltage of 33.3V and provides clamping protection at 53.9V with a peak pulse current rating of 11.2A. The part is actively produced, AEC-Q101 qualified for automotive applications, and fully compliant with RoHS3 and REACH regulations. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained within the specified parameter ranges.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	33.3	V
Voltage - Breakdown (Min)	37.1	V
Voltage - Clamping (Max) @ Ipp	53.9	V
Current - Peak Pulse (10/1000µs)	11.2	A
Power - Peak Pulse	600	W
Package / Case	DO-214AA, SMB	—
Operating Temperature Range	-65°C to 150°C	TJ
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the SZP6SMB39CAT3G are qualified based on the following criteria:

Critical Electrical Parameters (Must Match):

Voltage - Reverse Standoff (Typ): 33.3V
Voltage - Breakdown (Min): 37.1V minimum
Voltage - Clamping (Max) @ Ipp: 53.9V
Package / Case: DO-214AA or SMB equivalent
Bidirectional Channels: 1
Type: Zener

Acceptable Variation Parameters:

Current - Peak Pulse (10/1000µs): 11.2A or greater
Power - Peak Pulse: 600W or greater
Operating Temperature Range: Must encompass application requirements
Mounting Type: Surface Mount (all candidates)

Compliance Requirements:

RoHS3 Compliant
REACH Unaffected
Product Status: Active

Substitutes are grouped by electrical equivalence. Parts with identical clamping voltage (53.9V) and standoff voltage (33.3V) are direct replacements. Parts with higher peak pulse current or power ratings provide enhanced protection margins.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Package	AEC-Q101
SZP6SMB39CAT3G	Littelfuse Inc.	33.3V	53.9V	11.2A	600W	-65°C to 150°C	DO-214AA (SMB)	Yes
1KSMB39CA	Taiwan Semiconductor Corporation	33.3V	53.9V	18.6A	1000W	-55°C to 175°C	DO-214AA (SMB)	—
P6SMB39CA	Meritek	33.3V	53.9V	11.13A	600W	-55°C to 150°C	DO-214AA (SMB)	—
TPSMB39CA	Littelfuse Inc.	33.3V	53.9V	11.3A	600W	-65°C to 175°C	DO-214AA (SMB)	Yes
SM6T39CA	STMicroelectronics	33.3V	69.7V	57A (8/20µs)	600W	-55°C to 150°C	DO-214AA (SMB)	—
SM6T39CA-E3/52	Vishay General Semiconductor - Diodes Division	33.3V	53.9V	11.1A	600W	-65°C to 150°C	DO-214AA (SMB)	—
SM6T39CAY	STMicroelectronics	33.3V	69.7V	57A (8/20µs)	600W	-55°C to 150°C	DO-214AA (SMB)	Yes
SMBJP6KE39CA-TP	Micro Commercial Co	33.3V	53.9V	11.3A	600W	-55°C to 175°C	DO-214AA (SMB)	—

Engineering Selection Recommendations

Direct Electrical Equivalents (53.9V Clamping Voltage):

The following parts maintain identical clamping voltage and standoff voltage specifications:

P6SMB39CA (Meritek): Electrically equivalent with 11.13A peak pulse current. Active product status. Suitable for applications requiring standard 600W power dissipation.
TPSMB39CA (Littelfuse Inc.): Electrically equivalent with 11.3A peak pulse current and extended upper operating temperature to 175°C. AEC-Q101 qualified. Recommended for automotive applications requiring the same thermal performance as the original part.
SM6T39CA-E3/52 (Vishay General Semiconductor - Diodes Division): Electrically equivalent with 11.1A peak pulse current. Active product status. Suitable for applications with operating temperature range of -65°C to 150°C.
SMBJP6KE39CA-TP (Micro Commercial Co): Electrically equivalent with 11.3A peak pulse current and extended upper operating temperature to 175°C. Active product status. Suitable for applications requiring wider temperature range.

Enhanced Performance Alternatives (Higher Peak Pulse Current):

1KSMB39CA (Taiwan Semiconductor Corporation): Maintains 33.3V standoff and 53.9V clamping voltage with enhanced 18.6A peak pulse current and 1000W power dissipation. Extended upper operating temperature to 175°C. Provides increased protection margin for transient events.

Higher Clamping Voltage Alternatives (69.7V Clamping):

SM6T39CA (STMicroelectronics): Maintains 33.3V standoff voltage but increases clamping voltage to 69.7V with significantly higher 57A peak pulse current (8/20µs). Suitable only when higher clamping voltage is acceptable for the application.
SM6T39CAY (STMicroelectronics): Identical electrical specifications to SM6T39CA with AEC-Q101 qualification. Recommended for automotive applications requiring higher clamping voltage performance.

Compliance Considerations:

All substitute parts maintain RoHS3 compliance and REACH unaffected status. For automotive applications, TPSMB39CA and SM6T39CAY provide AEC-Q101 qualification matching the original part's certification level.

Frequently Asked Questions (FAQ)

Q: Can I use SM6T39CA or SM6T39CAY as a direct replacement for SZP6SMB39CAT3G?

A: These parts are not direct electrical equivalents. While they maintain the same 33.3V reverse standoff voltage, they increase the clamping voltage to 69.7V. Use only if your circuit design permits higher clamping voltage. Both parts are electrically identical to each other; SM6T39CAY includes AEC-Q101 automotive qualification.

Q: What is the difference between TPSMB39CA and the original SZP6SMB39CAT3G?

A: Both parts are manufactured by Littelfuse Inc. and maintain identical electrical specifications (33.3V standoff, 53.9V clamping, 11.3A peak pulse current). TPSMB39CA extends the upper operating temperature to 175°C compared to 150°C for the original part. Both are AEC-Q101 qualified for automotive use.

Q: Is 1KSMB39CA a suitable replacement?

A: Yes, 1KSMB39CA maintains the same clamping voltage (53.9V) and standoff voltage (33.3V) as the original part. It provides enhanced protection with 18.6A peak pulse current and 1000W power dissipation compared to 11.2A and 600W respectively. The extended upper operating temperature to 175°C is an additional benefit. This part is suitable when higher transient current handling is required.

Q: Are all substitute parts available in the same SMB package?

A: Yes, all substitute parts listed are available in DO-214AA (SMB) surface mount package, ensuring mechanical and footprint compatibility with the original SZP6SMB39CAT3G.

Q: Which substitute part should I select for automotive applications?

A: For automotive applications, select either TPSMB39CA or SM6T39CAY, as both carry AEC-Q101 qualification. TPSMB39CA maintains the original electrical specifications with extended temperature range. SM6T39CAY provides higher clamping voltage (69.7V) and peak pulse current (57A) if your design permits.

Q: What is the significance of the peak pulse current rating difference between 11.2A and 18.6A?

A: Peak pulse current rating indicates the maximum transient current the TVS diode can safely suppress during a 10/1000µs pulse. Higher ratings provide greater protection margin against transient events. The 1KSMB39CA with 18.6A rating offers enhanced protection compared to the original 11.2A rating while maintaining identical clamping voltage.

Q: Can I use parts with different operating temperature ranges?

A: Yes, provided the substitute part's operating temperature range encompasses your application requirements. For example, TPSMB39CA and SMBJP6KE39CA-TP extend the upper temperature limit to 175°C, suitable for high-temperature environments. Verify your circuit's maximum operating temperature against the substitute part's specification.

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