SMBJ58 Transient Voltage Suppressor Diode - Equivalent & Substitute Parts

Part Overview

The SMBJ58 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. The device features a 58V reverse standoff voltage with a maximum clamping voltage of 98.28V at peak pulse current of 6.5A, packaged in the DO-214AA (SMB) surface mount form factor. The SMBJ58 is classified as obsolete; equivalent and substitute parts with active product status are available to maintain design continuity and ensure supply chain reliability.

Key Parameters

Parameter	Value	Unit
Manufacturer Part Number	SMBJ58	—
Manufacturer	Littelfuse Inc.	—
Category	Transient Voltage Suppressors (TVS)	—
Type	Zener	—
Unidirectional Channels	1	—
Voltage - Reverse Standoff (Typ)	58	V
Voltage - Breakdown (Min)	61.02	V
Voltage - Clamping (Max) @ Ipp	98.28	V
Current - Peak Pulse (10/1000µs)	6.5	A
Power - Peak Pulse	600	W
Operating Temperature Range	-65 to 150	°C (TJ)
Mounting Type	Surface Mount	—
Package / Case	DO-214AA, SMB	—
RoHS Status	ROHS3 Compliant	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the SMBJ58 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 58V
Voltage - Clamping (Max) @ Ipp: 93.6V to 98.28V range
Current - Peak Pulse (10/1000µs): 6.4A to 6.7A range
Power - Peak Pulse: 600W
Package / Case: DO-214AA, SMB
Mounting Type: Surface Mount
Unidirectional Channels: 1

Secondary Compatibility Factors:

Operating Temperature Range: -55°C to 150°C minimum
RoHS Status: ROHS3 Compliant
Product Status: Active (preferred for new designs)

Substitute parts are grouped into two categories: direct electrical equivalents with identical standoff and clamping voltage specifications, and near-equivalent parts with minor variations in clamping voltage (within 4.68V tolerance) and peak pulse current (within 0.3A tolerance). All substitute parts maintain the same package form factor and power dissipation rating.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Clamping (Max) @ Ipp (V)	Current - Peak Pulse (A)	Operating Temperature (°C)	Product Status	RoHS Status
SMBJ58 (Main)	Littelfuse Inc.	58	98.28	6.5	-65 to 150	Obsolete	ROHS3 Compliant
SMBJ58A	Meritek	58	93.6	6.41	-55 to 150	Active	ROHS3 Compliant
SZ1SMB58AT3G	Littelfuse Inc.	58	93.6	6.4	-65 to 150	Active	ROHS3 Compliant
SMBJ58A-13-F	Diodes Incorporated	58	93.6	6.4	-55 to 150	Active	ROHS3 Compliant
SMBJ58A-E3/5B	Vishay General Semiconductor - Diodes Division	58	93.6	6.4	-55 to 150	Active	ROHS3 Compliant
SMBJ58A-TP	Micro Commercial Co	58	93.6	6.4	-55 to 175	Active	ROHS3 Compliant
SMBJ58A-TR	STMicroelectronics	58	93.6	6.7	-55 to 150	Active	ROHS3 Compliant
SMBJ64AE3/TR13	Microchip Technology	64	103	5.8	-65 to 150	Active	ROHS3 Compliant
P6SMB75A	Eaton - Electronics Division	6.4	11.3	54	-55 to 150	Active	RoHS Compliant

Engineering Selection Recommendations

Direct Equivalents (Recommended for Drop-In Replacement):

SMBJ58A (Meritek), SMBJ58A-13-F (Diodes Incorporated), SMBJ58A-E3/5B (Vishay), and SMBJ58A-TR (STMicroelectronics) are functionally equivalent to the SMBJ58. All maintain the 58V reverse standoff voltage specification with clamping voltages between 93.6V and 98.28V, peak pulse currents within 6.4A to 6.7A, and identical DO-214AA SMB packaging. All substitute parts carry active product status and ROHS3 compliance, ensuring long-term availability and regulatory conformance.

Extended Temperature Range Option:

SMBJ58A-TP (Micro Commercial Co) extends the maximum operating temperature to 175°C, providing enhanced thermal margin for applications requiring elevated temperature performance while maintaining electrical equivalence.

Automotive-Grade Alternative:

SZ1SMB58AT3G (Littelfuse Inc.) offers AEC-Q101 automotive qualification with identical electrical specifications and extended temperature range (-65°C to 150°C), suitable for automotive and harsh environment applications.

Higher Voltage Alternative (Non-Drop-In):

SMBJ64AE3/TR13 (Microchip Technology) provides 64V reverse standoff voltage with 103V clamping voltage. This part is suitable only for applications where higher voltage suppression is required and circuit design permits the voltage shift.

Not Recommended:

P6SMB75A (Eaton) operates at 6.4V reverse standoff voltage and is not electrically compatible with the SMBJ58 58V specification. This part is listed in the provided data but does not meet substitution criteria.

Frequently Asked Questions (FAQ)

Q: Can I use SMBJ58A as a direct replacement for SMBJ58?

A: Yes. SMBJ58A maintains the same 58V reverse standoff voltage and DO-214AA SMB package. The clamping voltage is 93.6V compared to the original 98.28V, representing a 4.68V reduction within acceptable tolerance for general-purpose TVS applications. Peak pulse current specifications (6.41A vs. 6.5A) are equivalent.

Q: What is the difference between SMBJ58A-TR and SMBJ58A-TP?

A: Both parts are electrically identical with 58V standoff and 93.6V clamping voltage. SMBJ58A-TP extends the maximum operating temperature to 175°C, compared to 150°C for SMBJ58A-TR. Select SMBJ58A-TP for applications requiring higher thermal performance.

Q: Is SZ1SMB58AT3G suitable for automotive applications?

A: Yes. SZ1SMB58AT3G carries AEC-Q101 automotive qualification and maintains the same electrical specifications as other SMBJ58 equivalents. It is specifically qualified for automotive and harsh environment use.

Q: Why is SMBJ64AE3/TR13 listed if it has different voltage specifications?

A: SMBJ64AE3/TR13 is provided as a reference for applications requiring higher voltage suppression (64V standoff, 103V clamping). It is not a direct replacement but may be suitable for redesigned circuits with higher voltage tolerance requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes. All recommended substitute parts carry ROHS3 compliance status, ensuring regulatory conformance with current environmental and hazardous substance restrictions.

Q: What packaging options are available for SMBJ58 equivalents?

A: All substitute parts use the DO-214AA (SMB) surface mount package. Packaging variants include Tape & Reel (TR), Cut Tape (CT) & Digi-Reel®, and standard reel configurations. Verify packaging availability with your supplier for procurement requirements.

Q: Can I substitute SMBJ58 with P6SMB75A?

A: No. P6SMB75A operates at 6.4V reverse standoff voltage and is not electrically compatible with the 58V SMBJ58 specification. This part is designed for low-voltage telecom applications and is not suitable for this application.

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