SMBJ90 Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The SMBJ90 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. The device features a 90V reverse standoff voltage with a 153.3V maximum clamping voltage at peak pulse current and is packaged in the DO-214AA (SMB) form factor.

The SMBJ90 is classified as obsolete. Equivalent and substitute parts are available from active manufacturers including MDD, Diodes Incorporated, and Microchip Technology, offering comparable electrical performance and identical mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	90	V
Voltage - Breakdown (Min)	94.95	V
Voltage - Clamping (Max) @ Ipp	153.3	V
Current - Peak Pulse (10/1000µs)	4.1	A
Power - Peak Pulse	600	W
Operating Temperature Range	-65 to 150	°C (TJ)
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SMBJ90 is determined by the following critical electrical and mechanical parameters:

Reverse Standoff Voltage: 90V (all substitutes maintain this specification)
Package / Case: DO-214AA, SMB (all substitutes use identical mechanical form factor)
Mounting Type: Surface Mount (all substitutes are surface-mount compatible)
Peak Pulse Power: 600W (all substitutes maintain this rating)
Unidirectional Configuration: Single channel (all substitutes are unidirectional)
RoHS Compliance: ROHS3 Compliant (all substitutes meet this requirement)

Substitute parts are grouped by manufacturer and product status. The SMBJ90A (MDD) and SMBJ90A-13-F (Diodes Incorporated) are active products with identical electrical performance. The SMBJ90E3/TR13 (Microchip Technology) is also active and provides equivalent protection with minor variations in clamping voltage and peak pulse current within acceptable operating ranges.

Parameter Comparison

Parameter	SMBJ90 (Littelfuse)	SMBJ90A (MDD)	SMBJ90A-13-F (Diodes Inc.)	SMBJ90E3/TR13 (Microchip)
Voltage - Reverse Standoff (Typ)	90V	90V	90V	90V
Voltage - Breakdown (Min)	94.95V	100V	100V	100V
Voltage - Clamping (Max) @ Ipp	153.3V	146V	146V	160V
Current - Peak Pulse (10/1000µs)	4.1A	4.1A	4.1A	3.8A
Power - Peak Pulse	600W	600W	600W	600W
Operating Temperature Range	-65 to 150°C	-50 to 150°C	-55 to 150°C	-65 to 150°C
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement)

The SMBJ90A (MDD) and SMBJ90A-13-F (Diodes Incorporated) are the preferred substitutes for the obsolete SMBJ90. Both parts maintain identical reverse standoff voltage (90V), peak pulse current (4.1A), and power rating (600W). The clamping voltage is reduced to 146V compared to the original 153.3V, which represents improved performance in transient suppression. Both manufacturers are active, ensuring long-term availability and supply chain stability. All three parts are ROHS3 compliant and use the identical DO-214AA (SMB) package.

Secondary Substitute (Alternative Option)

The SMBJ90E3/TR13 (Microchip Technology) is an active product that maintains the 90V reverse standoff voltage and 600W power rating. The clamping voltage is 160V and peak pulse current is 3.8A. This part is suitable for applications where slightly higher clamping voltage and marginally lower peak pulse current are acceptable. Microchip Technology provides REACH compliance documentation and active product support.

Product Status Consideration

All substitute parts are classified as active products, ensuring continued manufacturing, technical support, and supply availability. The original SMBJ90 (Littelfuse) is obsolete and should be replaced in new designs and production runs.

Frequently Asked Questions (FAQ)

Q: Can the SMBJ90A directly replace the SMBJ90 in existing designs?

A: Yes. The SMBJ90A (MDD) and SMBJ90A-13-F (Diodes Incorporated) are direct mechanical and electrical substitutes. Both maintain the 90V reverse standoff voltage, 4.1A peak pulse current, and 600W power rating. The identical DO-214AA (SMB) package ensures PCB footprint compatibility without layout modifications.

Q: What is the difference between the SMBJ90A and SMBJ90E3/TR13?

A: Both parts maintain the 90V reverse standoff voltage and 600W power rating. The SMBJ90A has a 146V maximum clamping voltage and 4.1A peak pulse current. The SMBJ90E3/TR13 has a 160V maximum clamping voltage and 3.8A peak pulse current. The choice depends on circuit requirements for clamping voltage and peak pulse current handling.

Q: Are all substitute parts RoHS compliant?

A: Yes. The SMBJ90A (MDD), SMBJ90A-13-F (Diodes Incorporated), and SMBJ90E3/TR13 (Microchip Technology) are all ROHS3 compliant, meeting environmental and regulatory requirements for electronic components.

Q: What is the operating temperature range for each substitute?

A: The SMBJ90A (MDD) operates from -50 to 150°C. The SMBJ90A-13-F (Diodes Incorporated) operates from -55 to 150°C. The SMBJ90E3/TR13 (Microchip Technology) operates from -65 to 150°C. Select based on your application's temperature requirements.

Q: Is the SMB package the same as DO-214AA?

A: Yes. SMB and DO-214AA refer to the same surface-mount package form factor. All substitute parts use this identical package, ensuring mechanical compatibility with existing PCB designs.

Q: Why is the original SMBJ90 obsolete?

A: The SMBJ90 (Littelfuse) is classified as obsolete. Active equivalent products from MDD, Diodes Incorporated, and Microchip Technology provide superior supply chain availability and long-term manufacturing support for new and ongoing production.

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