TPSMB47A Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The TPSMB47A is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for surface mount applications in the DO-214AA (SMB) package. This component provides transient overvoltage protection with a 40.2V reverse standoff voltage and 64.8V maximum clamping voltage at peak pulse current. The part is actively produced, AEC-Q101 qualified for automotive applications, and RoHS3 compliant. Equivalent and substitute parts are identified based on matching electrical performance parameters and package compatibility to support procurement flexibility and supply chain continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	40.2	V
Voltage - Breakdown (Min)	44.7	V
Voltage - Clamping (Max) @ Ipp	64.8	V
Current - Peak Pulse (10/1000µs)	9.4	A
Power - Peak Pulse	600	W
Operating Temperature Range	-65 to 175	°C (TJ)
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the TPSMB47A are qualified based on the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 40.0V to 40.2V
Voltage - Clamping (Max) @ Ipp: 64.8V to 84V
Current - Peak Pulse: 9.4A minimum
Power - Peak Pulse: 600W
Package / Case: DO-214AA or SMB
Mounting Type: Surface Mount
Type: Zener, Unidirectional

Substitute parts are grouped into two categories: Direct Equivalents (matching all primary electrical parameters) and Compatible Alternatives (meeting minimum performance requirements with acceptable parameter variations).

Parameter Comparison

Parameter	TPSMB47A (Littelfuse)	P6SMB47A (Eaton)	SM6T47AY (STMicroelectronics)	SMBJP6KE47A-TP (Micro Commercial Co)
Manufacturer	Littelfuse Inc.	Eaton - Electronics Division	STMicroelectronics	Micro Commercial Co
Series	TPSMB	P6SMB	SM6TY, TRANSIL™	SMBJ
Voltage - Reverse Standoff (Typ)	40.2V	40.2V	40V	40.2V
Voltage - Breakdown (Min)	44.7V	44.7V	44.4V	44.7V
Voltage - Clamping (Max) @ Ipp	64.8V	64.8V	84V	64.8V
Current - Peak Pulse (10/1000µs)	9.4A	9.4A	48A (8/20µs)	9.4A
Power - Peak Pulse	600W	600W	600W	600W
Operating Temperature Range	-65 to 175°C	-55 to 150°C	-55 to 150°C	-55 to 175°C
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Product Status	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant
AEC-Q101 Qualification	Yes	Not specified	Yes	Not specified

Engineering Selection Recommendations

P6SMB47A (Eaton - Electronics Division) is the primary manufacturer-recommended substitute. This part matches the TPSMB47A across all critical electrical parameters: 40.2V reverse standoff voltage, 64.8V clamping voltage, and 9.4A peak pulse current. Both parts are active products with RoHS compliance. The P6SMB47A operates within -55 to 150°C, which is narrower than the TPSMB47A's -65 to 175°C range; applications requiring the full temperature range of the original part should account for this limitation.

SMBJP6KE47A-TP (Micro Commercial Co) provides direct electrical equivalence to the TPSMB47A with identical voltage and current ratings. This part extends the upper operating temperature to 175°C, matching the original specification. RoHS3 compliance is confirmed. This substitute is suitable for applications requiring the full automotive temperature range.

SM6T47AY (STMicroelectronics) is a compatible alternative with higher peak pulse current capability (48A at 8/20µs versus 9.4A at 10/1000µs) and elevated clamping voltage (84V). This part is AEC-Q101 qualified and RoHS3 compliant. The increased current and voltage ratings provide additional transient protection margin but may not be necessary for applications designed around the TPSMB47A specifications. Selection of this part should be based on circuit requirements for enhanced overvoltage protection.

All substitute parts maintain the DO-214AA (SMB) surface mount package and are available in tape and reel packaging.

Frequently Asked Questions (FAQ)

Q: Can P6SMB47A replace TPSMB47A in all applications?

A: P6SMB47A matches the TPSMB47A in voltage and current ratings and is the manufacturer-recommended substitute. However, the operating temperature range differs: P6SMB47A operates from -55 to 150°C while TPSMB47A operates from -65 to 175°C. Applications requiring operation below -55°C or above 150°C require alternative selection.

Q: What is the difference between SM6T47AY and TPSMB47A?

A: SM6T47AY has higher peak pulse current (48A at 8/20µs) and higher clamping voltage (84V) compared to TPSMB47A (9.4A at 10/1000µs, 64.8V clamping). Both maintain the same 40.2V reverse standoff voltage. SM6T47AY provides enhanced transient protection but operates within a narrower temperature range (-55 to 150°C).

Q: Are all substitute parts in the same package?

A: Yes. All substitute parts use the DO-214AA (SMB) surface mount package, ensuring mechanical and thermal compatibility with TPSMB47A footprints.

Q: Which substitute part is best for automotive applications?

A: Both TPSMB47A and SM6T47AY carry AEC-Q101 qualification for automotive use. SMBJP6KE47A-TP is RoHS3 compliant and suitable for automotive applications but does not specify AEC-Q101 qualification. P6SMB47A does not specify automotive qualification. For applications requiring formal automotive qualification, TPSMB47A or SM6T47AY are the appropriate selections.

Q: Can SMBJP6KE47A-TP be used in place of TPSMB47A?

A: Yes. SMBJP6KE47A-TP provides direct electrical equivalence with identical voltage and current ratings and extends the upper operating temperature to 175°C, matching the original part's full temperature range. RoHS3 compliance is confirmed.

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