SMBJ9.0A Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SMBJ9.0A is a unidirectional Zener-type transient voltage suppressor diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. The device features a 9V reverse standoff voltage with a 15.4V maximum clamping voltage and 39A peak pulse current capability in a DO-214AA (SMB) package. This component is actively produced and ROHS3 compliant, making it suitable for modern electronic assemblies requiring transient voltage suppression.

Equivalent and substitute parts are necessary when the primary manufacturer part becomes unavailable, when supply chain optimization is required, or when design flexibility across multiple qualified sources is needed while maintaining identical electrical and mechanical performance.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	9	V
Voltage - Breakdown (Min)	10	V
Voltage - Clamping (Max) @ Ipp	15.4	V
Current - Peak Pulse (10/1000µs)	39	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 eligibility for the SMBJ9.0A is determined by strict equivalence across the following critical parameters:

Voltage - Reverse Standoff (Typ): 9V
Voltage - Breakdown (Min): 10V
Voltage - Clamping (Max) @ Ipp: 15.4V
Current - Peak Pulse (10/1000µs): 39A or higher
Power - Peak Pulse: 600W
Package / Case: DO-214AA or SMB
Mounting Type: Surface Mount
Type: Zener, Unidirectional
RoHS Status: ROHS3 Compliant

All qualified substitute parts listed maintain these electrical specifications and package compatibility. Variations in operating temperature range, manufacturer series designation, or peak pulse current above the minimum threshold do not affect functional substitutability in general-purpose transient voltage suppression applications.

Parameter Comparison

Parameter	SMBJ9.0A (Littelfuse)	SMBJ9.0A-13-F (Diodes Inc.)	SMBJ9.0A-E3/52 (Vishay)	SMBJ9V0A (Taiwan Semi)	SMBJ9.0A (Taiwan Semi - MFR Rec.)
Manufacturer	Littelfuse Inc.	Diodes Incorporated	Vishay General Semiconductor	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation
Voltage - Reverse Standoff (Typ)	9V	9V	9V	9V	9V
Voltage - Breakdown (Min)	10V	10V	10V	10V	10V
Voltage - Clamping (Max) @ Ipp	15.4V	15.4V	15.4V	15.4V	15.4V
Current - Peak Pulse (10/1000µs)	39A	39A	39A	39A	40A
Power - Peak Pulse	600W	600W	600W	600W	600W
Operating Temperature Range	-65 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All listed substitute parts are actively produced and ROHS3 compliant, meeting current regulatory requirements for electronic component procurement. Selection among equivalent parts should be based on:

Availability and lead time from qualified distributors
Packaging format preference (Tape & Reel availability)
Manufacturer qualification status within your organization's approved vendor list
Operating temperature range requirements (Littelfuse SMBJ9.0A supports -65°C minimum; all other parts support -55°C minimum)
Current capacity margin (Taiwan Semiconductor MFR Recommended variant provides 40A peak pulse current versus 39A baseline)

All parts maintain identical voltage suppression characteristics and package footprint compatibility, ensuring direct PCB-level substitution without design modification.

Frequently Asked Questions (FAQ)

Q: Can SMBJ9.0A-13-F (Diodes Incorporated) be used as a direct replacement for SMBJ9.0A (Littelfuse)?

A: Yes. Both parts share identical electrical specifications (9V standoff, 15.4V clamping, 39A peak pulse) and DO-214AA package geometry. The primary difference is the operating temperature minimum (-55°C versus -65°C for Littelfuse), which does not affect substitutability in applications operating above -55°C.

Q: What is the difference between SMBJ9.0A and SMBJ9V0A?

A: These are equivalent parts from different manufacturers (Littelfuse and Taiwan Semiconductor Corporation). The nomenclature differs slightly (9.0A versus 9V0A), but electrical performance and package specifications are identical. Both are suitable for direct substitution.

Q: Is the SMBJ9.0A-E3/52 (Vishay TransZorb) compatible with the original SMBJ9.0A?

A: Yes. The Vishay part maintains all critical electrical parameters (9V standoff, 15.4V clamping, 39A peak pulse, 600W power dissipation) and uses the same DO-214AA surface-mount package. The TransZorb series designation is a Vishay product line identifier and does not affect functional compatibility.

Q: Why does the Taiwan Semiconductor MFR Recommended part list 40A peak pulse current instead of 39A?

A: The 40A specification represents a higher current capability within the same voltage suppression envelope. This part remains fully compatible as it meets or exceeds the 39A minimum requirement. The additional 1A capacity provides additional margin without affecting other electrical characteristics.

Q: Are all substitute parts available in Tape & Reel packaging?

A: Tape & Reel (TR) packaging is confirmed for SMBJ9.0A-13-F (Diodes), SMBJ9.0A-E3/52 (Vishay), and SMBJ9V0A (Taiwan Semiconductor). Packaging format should be verified with your distributor for the specific part and quantity required.

Q: What compliance certifications apply to all substitute parts?

A: All listed parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with HTSUS code 8541.10.0080. Moisture sensitivity level is 1 (Unlimited) for all variants.

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