SMBJ51A-13 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SMBJ51A-13 is a unidirectional Zener transient voltage suppressor diode manufactured by Diodes Incorporated, designed for general-purpose overvoltage protection in surface-mount applications. The device features a 51V reverse standoff voltage with an 82.4V maximum clamping voltage and 7.3A peak pulse current capability in a DO-214AA (SMB) package. This part is currently discontinued at DiGi Electronics. Equivalent and substitute parts are available from multiple manufacturers with identical or comparable electrical specifications, offering continued design support and component availability.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	51	V
Voltage - Breakdown (Min)	56.7	V
Voltage - Clamping (Max) @ Ipp	82.4	V
Current - Peak Pulse (10/1000µs)	7.3	A
Power - Peak Pulse	600	W
Operating Temperature Range	-55 to 150	°C (TJ)
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitute parts for the SMBJ51A-13 are classified into two categories based on electrical and mechanical compatibility:

Category 1: Direct Electrical Equivalents (Identical Specifications) These parts maintain all critical electrical parameters: 51V reverse standoff voltage, 56.7V minimum breakdown voltage, 82.4V maximum clamping voltage, 7.3A peak pulse current, and 600W peak pulse power. All parts use the DO-214AA (SMB) surface-mount package. Substitution within this category is based on matching these core parameters and package type.

Category 2: Manufacturer-Recommended Alternatives (Modified Specifications) These parts are manufacturer-recommended substitutes with altered electrical specifications. They maintain the same package and mounting type but feature different voltage ratings and current capabilities. Selection from this category requires application-level verification of the modified parameters.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Clamping (Max) @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Package	Product Status	RoHS Status
SMBJ51A-13	Diodes Incorporated	51	82.4	7.3	600	DO-214AA, SMB	Discontinued	RoHS non-compliant
SMBJ51A-13-F	Diodes Incorporated	51	82.4	7.3	600	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ51A	Good-Ark Semiconductor	51	82.4	7.3	600	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ51A-TP	Micro Commercial Co	51	82.4	7.3	600	DO-214AA, SMB	Active	ROHS3 Compliant
P6SMB51A	Eaton - Electronics Division	43.6	70.1	8.7	600	DO-214AA, SMB	Active	RoHS Compliant
PTVS48VP1UP,115	Nexperia USA Inc.	48	77.4	7.8	600	SOD-128	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents): SMBJ51A-13-F, SMBJ51A (Good-Ark), and SMBJ51A-TP are direct electrical equivalents with identical voltage and current specifications. All three are currently in active production status with improved RoHS3 compliance compared to the discontinued SMBJ51A-13. These parts are suitable for direct replacement in existing designs without circuit modification.

Secondary Alternatives (Modified Specifications): P6SMB51A and PTVS48VP1UP,115 are manufacturer-recommended alternatives with modified electrical parameters. P6SMB51A features a lower reverse standoff voltage (43.6V) and clamping voltage (70.1V) with higher peak pulse current (8.7A). PTVS48VP1UP,115 operates at 48V reverse standoff with 77.4V clamping voltage and includes AEC-Q101 automotive qualification. These alternatives require application-level assessment to confirm compatibility with the original circuit protection requirements.

Compliance Considerations: The original SMBJ51A-13 is RoHS non-compliant. All active substitute parts listed are RoHS3 compliant, supporting modern manufacturing and environmental standards.

Frequently Asked Questions (FAQ)

Q: Can SMBJ51A-13-F be used as a direct replacement for SMBJ51A-13? A: Yes. SMBJ51A-13-F maintains identical electrical specifications (51V standoff, 82.4V clamping, 7.3A peak pulse) and package type (DO-214AA, SMB). The primary difference is product status (active vs. discontinued) and improved RoHS3 compliance.

Q: What is the difference between SMBJ51A from different manufacturers? A: Diodes Incorporated SMBJ51A-13-F, Good-Ark SMBJ51A, and Micro Commercial Co SMBJ51A are electrically identical with matching voltage ratings, current ratings, and package specifications. Differences exist only in manufacturer, packaging format (cut tape vs. tape & reel), and inventory availability.

Q: Can P6SMB51A replace SMBJ51A-13 in all applications? A: No. P6SMB51A has different electrical specifications: 43.6V reverse standoff (vs. 51V) and 70.1V clamping voltage (vs. 82.4V). This part is suitable only for applications where the lower voltage rating is acceptable. Circuit-level verification is required.

Q: What is the package difference between PTVS48VP1UP,115 and other substitutes? A: PTVS48VP1UP,115 uses SOD-128 package, while SMBJ51A-13 and most direct equivalents use DO-214AA (SMB) package. Different package geometry requires PCB layout modification and is not a direct mechanical substitute.

Q: Are all substitute parts RoHS compliant? A: All active substitute parts listed are RoHS3 compliant. The original SMBJ51A-13 is RoHS non-compliant. For new designs or manufacturing transitions, RoHS3-compliant alternatives are recommended.

Q: Which substitute offers the best availability? A: Good-Ark SMBJ51A shows the highest inventory level (17,300 pcs) among direct equivalents. Diodes Incorporated SMBJ51A-13-F offers 15,200 pcs in stock. Both are suitable for volume production requirements.

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