SMBJ43A-13 Equivalent & Substitute Parts

Part Overview

The SMBJ43A-13 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Diodes Incorporated in the SMB (DO-214AA) surface mount package. This component is designed for general-purpose transient voltage suppression applications with a 43V reverse standoff voltage and 69.4V maximum clamping voltage. The part is currently discontinued at DiGi Electronics, necessitating identification of equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Key Parameters

Parameter	Value	Unit
Reverse Standoff Voltage (Typ)	43	V
Breakdown Voltage (Min)	47.8	V
Clamping Voltage (Max) @ Ipp	69.4	V
Peak Pulse Current (10/1000µs)	8.6	A
Peak Pulse Power	600	W
Operating Temperature Range	-55 to 150	°C
Package Type	DO-214AA (SMB)	—
Mounting Type	Surface Mount	—
Diode Type	Zener	—
Channels	1 (Unidirectional)	—

Substitute Part Grouping Explanation

Substitution of the SMBJ43A-13 is determined by strict equivalence in the following electrical parameters: reverse standoff voltage (43V nominal), breakdown voltage minimum (47.8V), clamping voltage maximum at peak pulse current (69.4V), and peak pulse current rating (8.6A). The package type must be DO-214AA (SMB) surface mount to ensure mechanical and thermal compatibility with existing PCB layouts. Operating temperature range and power dissipation capability must meet or exceed the original specification.

Substitute parts are grouped into two categories:

Direct Electrical Equivalents (Same Voltage/Current Ratings): Parts with identical 43V standoff, 47.8V breakdown, 69.4V clamp, and 8.6A peak pulse current ratings in SMB or compatible packages.

Functional Alternatives (Different Voltage Ratings): Parts with different voltage specifications that may serve similar circuit protection roles but require circuit-level evaluation.

Parameter Comparison

Part Number	Manufacturer	Standoff Voltage (V)	Breakdown Min (V)	Clamp Voltage (V)	Peak Pulse Current (A)	Package	Product Status	RoHS Status
SMBJ43A-13	Diodes Incorporated	43	47.8	69.4	8.6	DO-214AA (SMB)	Discontinued	Non-compliant
SMBJ43A-13-F	Diodes Incorporated	43	47.8	69.4	8.6	DO-214AA (SMB)	Active	ROHS3 Compliant
SMBJ43A-TP	Micro Commercial Co	43	47.8	69.4	8.6	DO-214AA (SMB)	Active	ROHS3 Compliant
SMBJ43A	Meritek	43	47.8	69.4	8.65	DO-214AA (SMB)	Active	ROHS3 Compliant
PTVS43VP1UP,115	Nexperia USA Inc.	43	47.8	69.4	8.6	SOD-128	Active	ROHS3 Compliant
P6SMB43A	Eaton - Electronics Division	36.8	40.9	59.3	10.3	DO-214AA (SMB)	Active	RoHS Compliant

Engineering Selection Recommendations

Primary Substitutes (Direct Electrical Equivalents):

SMBJ43A-13-F (Diodes Incorporated) is the direct replacement for SMBJ43A-13. This part maintains identical electrical specifications and SMB package compatibility while offering active product status and ROHS3 compliance. The tape and reel packaging format is standard for production environments.

SMBJ43A-TP (Micro Commercial Co) provides equivalent electrical performance with identical voltage and current ratings in the SMB package. Active product status and ROHS3 compliance support long-term supply chain stability. Operating temperature range extends to 175°C, providing additional thermal margin.

SMBJ43A (Meritek) delivers equivalent electrical performance with peak pulse current of 8.65A, within acceptable tolerance of the 8.6A specification. Active status and ROHS3 compliance ensure regulatory compliance and supply availability.

Alternative Substitute (Different Voltage Rating):

P6SMB43A (Eaton - Electronics Division) operates at a lower voltage rating (36.8V standoff, 59.3V clamp) with higher peak pulse current (10.3A). This part is suitable only for applications where the lower voltage threshold is acceptable and the higher current capacity provides design margin. Circuit-level evaluation is required to confirm compatibility.

Package Variant:

PTVS43VP1UP,115 (Nexperia USA Inc.) maintains identical electrical specifications but uses the SOD-128 package instead of SMB. This part includes AEC-Q101 automotive qualification. PCB layout modification is required for package substitution; direct footprint compatibility does not exist.

Frequently Asked Questions (FAQ)

Q: Can SMBJ43A-13-F be used as a direct replacement for SMBJ43A-13?

A: Yes. SMBJ43A-13-F is electrically and mechanically identical to SMBJ43A-13, with the primary difference being active product status and ROHS3 compliance. The SMB package footprint is identical, and all electrical parameters match exactly.

Q: What is the difference between SMBJ43A-13-F and SMBJ43A-TP?

A: Both parts are direct electrical equivalents with identical voltage and current ratings in the SMB package. SMBJ43A-TP is manufactured by Micro Commercial Co and specifies an extended operating temperature range to 175°C compared to 150°C for the Diodes Incorporated part. Selection depends on thermal requirements and supplier availability.

Q: Can P6SMB43A replace SMBJ43A-13 in all applications?

A: No. P6SMB43A has different electrical specifications: 36.8V standoff voltage versus 43V, and 59.3V clamp voltage versus 69.4V. This part is suitable only for circuits designed to operate at the lower voltage threshold. Higher peak pulse current (10.3A) does not compensate for the voltage difference. Circuit-level analysis is required before substitution.

Q: Why does PTVS43VP1UP,115 use a different package?

A: PTVS43VP1UP,115 is manufactured by Nexperia in the SOD-128 package format. While electrical specifications are identical to SMBJ43A-13, the SOD-128 package has a different footprint than DO-214AA (SMB). PCB layout modification is necessary for this substitution. This part includes AEC-Q101 automotive qualification, making it suitable for automotive applications.

Q: What does ROHS3 compliance mean for these parts?

A: ROHS3 compliance indicates conformance to the Restriction of Hazardous Substances Directive 3, which restricts the use of specific hazardous materials in electrical and electronic equipment. All active substitute parts listed are ROHS3 compliant, whereas the original SMBJ43A-13 is non-compliant. This compliance status is important for regulatory requirements in many markets.

Q: Are there inventory considerations for selecting a substitute?

A: Yes. SMBJ43A-13-F has the highest inventory availability (215,300 pcs), followed by SMBJ43A from Meritek (15,822 pcs) and SMBJ43A-TP (3,731 pcs). Inventory levels support long-term production requirements and reduce supply chain risk.

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