SMBJ54C Transient Voltage Suppressor Diode - Equivalent & Substitute Parts

Part Overview

The SMBJ54C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 54V reverse standoff voltage with a 91.46V maximum clamping voltage and 6.9A peak pulse current capability in a DO-214AA (SMB) package. The SMBJ54C is classified as obsolete, making identification of active equivalent parts essential for new designs and ongoing production support.

Key Parameters

Parameter	Value	Unit
Reverse Standoff Voltage (Typ)	54	V
Breakdown Voltage (Min)	56.84	V
Clamping Voltage (Max) @ Ipp	91.46	V
Peak Pulse Current (10/1000µs)	6.9	A
Peak Pulse Power	600	W
Package Type	DO-214AA (SMB)	—
Mounting Type	Surface Mount	—
Operating Temperature Range	-65 to 150	°C (TJ)
Diode Type	Zener	—
Bidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution of the SMBJ54C is determined by strict equivalence across the following electrical and mechanical parameters:

Reverse standoff voltage: 54V (nominal)
Breakdown voltage minimum: 60V or greater
Clamping voltage maximum: 87.1V to 91.46V @ Ipp
Peak pulse current: 6.89A to 6.9A (10/1000µs)
Peak pulse power: 600W
Package: DO-214AA (SMB) surface mount
Bidirectional channels: 1
Diode type: Zener

All substitute parts listed maintain these core electrical specifications and the same physical package footprint, ensuring direct functional replacement without circuit redesign. Variations in operating temperature range and clamping voltage within the specified limits do not affect substitutability for general-purpose transient suppression applications.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Reverse Standoff (V)	Breakdown Min (V)	Clamping Max @ Ipp (V)	Peak Pulse Current (A)	Operating Temp (°C)	Product Status	Package
SMBJ54C	Littelfuse Inc.	54	56.84	91.46	6.9	-65 to 150	Obsolete	DO-214AA (SMB)
SMBJ54CA	Fairchild Semiconductor	54	60	87.1	6.9	-55 to 150	Active	DO-214AA (SMB)
SZ1SMB54CAT3G	Littelfuse	54	60	87.1	6.9	-65 to 150	Active	DO-214AA (SMB)
SMBJ54CA-13-F	Diodes Incorporated	54	60	87.1	6.9	-55 to 150	Active	DO-214AA (SMB)
SMBJ54CA-E3/5B	Vishay General Semiconductor	54	60	87.1	6.9	-55 to 150	Active	DO-214AA (SMB)
SMBJ54CA-TP	Micro Commercial Co	54	60	87.1	6.9	-55 to 175	Active	DO-214AA (SMB)
TV06B540JB-G	Comchip Technology	54	60	87.1	6.89	Not specified	Active	DO-214AA (SMB)

Engineering Selection Recommendations

All listed substitute parts are active products with ROHS3 compliance and MSL 1 (unlimited moisture sensitivity level) ratings, making them suitable for immediate procurement and deployment. The SMBJ54CA from Fairchild Semiconductor offers the highest inventory availability (140,300 units) and represents the primary recommended substitute. The SZ1SMB54CAT3G from Littelfuse maintains the original manufacturer's design lineage and extends the operating temperature range to -65°C, matching the SMBJ54C specification for applications requiring extended low-temperature performance.

For applications with elevated temperature requirements, the SMBJ54CA-TP from Micro Commercial Co extends the upper operating limit to 175°C. The SMBJ54CA-13-F from Diodes Incorporated and SMBJ54CA-E3/5B from Vishay provide additional sourcing options with active product status and established supply chains.

All substitute parts maintain electrical equivalence within the specified parameter tolerances and require no circuit modifications for direct replacement.

Frequently Asked Questions (FAQ)

Q: Can SMBJ54CA directly replace SMBJ54C without circuit modification?

A: Yes. Both parts share identical reverse standoff voltage (54V), peak pulse current (6.9A), peak pulse power (600W), and DO-214AA package specifications. The clamping voltage difference (87.1V vs. 91.46V) falls within acceptable tolerance for general-purpose transient suppression and does not require circuit redesign.

Q: What is the difference between SMBJ54CA and SZ1SMB54CAT3G?

A: Both parts are electrically equivalent with matching 54V standoff and 87.1V clamping specifications. The primary difference is manufacturer (Fairchild vs. Littelfuse) and operating temperature range. SZ1SMB54CAT3G extends the lower temperature limit to -65°C, matching the original SMBJ54C specification, while SMBJ54CA operates from -55°C. Select SZ1SMB54CAT3G for applications requiring extended low-temperature performance.

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

A: Yes. All substitute parts use the DO-214AA (SMB) surface-mount package with identical footprint and pinout, enabling direct PCB replacement without layout modifications.

Q: What certifications apply to these substitute parts?

A: All substitute parts carry ROHS3 compliance and MSL 1 (unlimited) moisture sensitivity ratings. SZ1SMB54CAT3G includes AEC-Q101 automotive qualification. All parts are classified under ECCN EAR99 and HTSUS 8541.10.0080.

Q: Which substitute offers the best long-term availability?

A: SMBJ54CA from Fairchild Semiconductor maintains the highest inventory level (140,300 units) and active product status, providing optimal long-term sourcing stability for production applications.

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