SMBJ40A-13 Equivalent & Substitute Parts

Part Overview

The SMBJ40A-13 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Diodes Incorporated, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 40V reverse standoff voltage with a 64.5V maximum clamping voltage and 9.3A peak pulse current capability in the SMB (DO-214AA) package. The SMBJ40A-13 is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives that maintain electrical performance and mechanical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	40	V
Voltage - Breakdown (Min)	44.4	V
Voltage - Clamping (Max) @ Ipp	64.5	V
Current - Peak Pulse (10/1000µs)	9.3	A
Power - Peak Pulse	600	W
Package / Case	DO-214AA, SMB	—
Operating Temperature Range	-55 to 150	°C (TJ)
Mounting Type	Surface Mount	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution of the SMBJ40A-13 is determined by strict equivalence across the following electrical and mechanical parameters:

Voltage - Reverse Standoff (Typ): 40V
Voltage - Breakdown (Min): 44.4V
Voltage - Clamping (Max) @ Ipp: 64.5V
Current - Peak Pulse (10/1000µs): 9.3A (±tolerance acceptable)
Power - Peak Pulse: 600W
Package / Case: DO-214AA, SMB
Unidirectional Channels: 1
Mounting Type: Surface Mount

Substitute parts are grouped into two categories:

Category A - Direct Electrical & Package Equivalents: Parts maintaining identical electrical specifications and SMB package form factor. These include SMBJ40A-13-F (Diodes Incorporated), SMBJ40A (MDD), and SMBJ40A-TP (Micro Commercial Co). These parts are interchangeable at the circuit level with no design modifications required.

Category B - Electrical Equivalents with Package Variation: Parts meeting all electrical specifications but utilizing alternative surface-mount packages. PTVS40VP1UP,115 (Nexperia USA Inc.) employs SOD-128 packaging instead of SMB, requiring PCB layout and footprint redesign.

Category C - Partial Electrical Equivalents: SM6T47AY (STMicroelectronics) maintains the 40V reverse standoff and 44.4V breakdown voltage but specifies a higher clamping voltage (84V) and higher peak pulse current (48A at 8/20µs), making it suitable only for applications tolerating elevated clamping characteristics.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Breakdown (V)	Voltage - Clamping (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Package	Operating Temp (°C)	Product Status	RoHS Status
SMBJ40A-13	Diodes Incorporated	40	44.4	64.5	9.3	600	DO-214AA, SMB	-55 to 150	Discontinued	RoHS non-compliant
SMBJ40A-13-F	Diodes Incorporated	40	44.4	64.5	9.3	600	DO-214AA, SMB	-55 to 150	Active	ROHS3 Compliant
SMBJ40A	MDD	40	44.4	64.5	9.3	600	DO-214AA, SMB	-50 to 150	Active	ROHS3 Compliant
SMBJ40A-TP	Micro Commercial Co	40	44.4	64.5	9.3	600	DO-214AA, SMB	-55 to 175	Active	ROHS3 Compliant
PTVS40VP1UP,115	Nexperia USA Inc.	40	44.4	64.5	9.3	600	SOD-128	-55 to 150	Active	ROHS3 Compliant
SM6T47AY	STMicroelectronics	40	44.4	84	48 (8/20µs)	600	DO-214AA, SMB	-55 to 150	Active	ROHS3 Compliant
SMBJ40A-TR	STMicroelectronics	40	44.4	64.5	9.7	600	DO-214AA, SMB	-55 to 150	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation - SMBJ40A-13-F (Diodes Incorporated): This part is the direct successor to the discontinued SMBJ40A-13, maintaining identical electrical specifications and SMB package form factor. It is actively produced, ROHS3 compliant, and available in high volume (189,737 pcs in stock). No circuit or PCB modifications are required for substitution.

Secondary Recommendation - SMBJ40A-TP (Micro Commercial Co): This part meets all electrical requirements with identical clamping voltage and peak pulse current. It offers an extended operating temperature range (-55 to 175°C) compared to the original part, providing additional thermal margin. ROHS3 compliant and actively produced. No design changes required.

Alternative for Extended Temperature Applications - SMBJ40A (MDD): Maintains full electrical equivalence with ROHS3 compliance and active production status. Operating temperature range is -50 to 150°C, which is 5°C narrower at the lower bound than the original specification. Suitable for applications not requiring the full -55°C minimum.

Package-Variant Alternative - PTVS40VP1UP,115 (Nexperia USA Inc.): Provides electrical equivalence with identical clamping voltage and peak pulse current. Requires PCB footprint redesign due to SOD-128 package substitution for SMB. Includes AEC-Q101 automotive qualification. ROHS3 compliant and actively produced.

Limited Compatibility - SM6T47AY (STMicroelectronics): This part maintains the 40V reverse standoff voltage but specifies 84V clamping voltage and 48A peak pulse current (8/20µs measurement basis). Suitable only for applications where elevated clamping voltage is acceptable or beneficial. Includes AEC-Q101 automotive qualification and ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can SMBJ40A-13-F be used as a direct drop-in replacement for SMBJ40A-13?

A: Yes. SMBJ40A-13-F maintains identical electrical specifications (40V standoff, 44.4V breakdown, 64.5V clamping, 9.3A peak pulse) and SMB package form factor. No circuit or PCB modifications are required. The primary difference is active production status and ROHS3 compliance.

Q: What is the difference between SMBJ40A-TP and SMBJ40A-13-F?

A: Both parts are electrically equivalent with identical clamping voltage and peak pulse current. SMBJ40A-TP offers an extended upper operating temperature limit (175°C vs. 150°C), providing additional thermal headroom. Both are ROHS3 compliant and actively produced. Selection depends on thermal requirements of the application.

Q: Why does SM6T47AY have different clamping voltage and peak pulse current?

A: SM6T47AY is specified with 84V clamping voltage and 48A peak pulse current (measured at 8/20µs pulse duration), compared to 64.5V and 9.3A (10/1000µs) for SMBJ40A-13. This represents a different device variant within the same 40V standoff voltage class. It is suitable only for applications tolerating or requiring higher clamping characteristics.

Q: Can PTVS40VP1UP,115 replace SMBJ40A-13 without PCB changes?

A: No. PTVS40VP1UP,115 uses SOD-128 package instead of SMB (DO-214AA). PCB footprint and layout redesign is required. Electrical specifications are equivalent. This substitution is appropriate only when PCB redesign is feasible.

Q: Are all substitute parts ROHS3 compliant?

A: All active substitute parts listed (SMBJ40A-13-F, SMBJ40A, SMBJ40A-TP, PTVS40VP1UP,115, SM6T47AY, SMBJ40A-TR) are ROHS3 compliant. The original SMBJ40A-13 is RoHS non-compliant, making substitution necessary for applications requiring RoHS compliance.

Q: What is the minimum operating temperature difference between substitute parts?

A: SMBJ40A (MDD) specifies -50°C minimum operating temperature, which is 5°C higher than the original SMBJ40A-13 (-55°C minimum). All other substitutes maintain the -55°C minimum. Applications requiring full -55°C operation should avoid the MDD variant.

Q: Do any substitute parts include automotive qualification?

A: Yes. PTVS40VP1UP,115 (Nexperia) and SM6T47AY (STMicroelectronics) both carry AEC-Q101 automotive qualification. Other substitutes do not specify automotive qualification in the provided data.

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