SMBJ400 Equivalent & Substitute Parts

Part Overview

The SMBJ400 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 400V reverse standoff voltage, 680.4V maximum clamping voltage, and 900mA peak pulse current capability in a DO-214AA (SMB) package. The SMBJ400 is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for new designs and production continuity.

Substiute Parts

SMBJ400

Littelfuse Inc.In Stock: 927SMBJ400 Datasheet

Current PartRFQ

SMBJ400A

SMC Diode SolutionsIn Stock: 19522SMBJ400A Datasheet

DirectRFQ

SMBJ400A

SMC Diode SolutionsIn Stock: 19522SMBJ400A Datasheet

DirectRFQ

SMBJ400A-TP

Micro Commercial CoIn Stock: 2564SMBJ400A-TP Datasheet

MFR RecommendedRFQ

TV06B401J-HF

Comchip TechnologyIn Stock: 883TV06B401J-HF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMBJ400 is determined by the following critical parameters:

• Voltage - Reverse Standoff: 400V (exact match required)
• Voltage - Clamping (Max) @ Ipp: Must not exceed 680.4V
• Current - Peak Pulse (10/1000µs): Minimum 900mA
• Power - Peak Pulse: 600W
• Package / Case: DO-214AA, SMB (surface mount)
• Mounting Type: Surface Mount
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level: 1 (Unlimited)

The identified substitute parts maintain these core electrical specifications and package requirements, ensuring functional equivalence in circuit protection applications. Variations in clamping voltage below the maximum threshold and peak pulse current at or above the specified value are acceptable within the design envelope.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts—SMBJ400A (SMC Diode Solutions), SMBJ400A-TP (Micro Commercial Co), and TV06B401J-HF (Comchip Technology)—are active products with ROHS3 compliance and MSL 1 ratings, meeting the environmental and regulatory requirements of the obsolete SMBJ400.

SMBJ400A and SMBJ400A-TP are electrically identical, with SMBJ400A-TP offered in Tape & Reel packaging for automated assembly. SMBJ400A-TP extends the operating temperature range to 175°C, providing additional thermal margin in high-temperature applications.

TV06B401J-HF offers a marginally higher peak pulse current (930mA versus 900mA) and is available in Tape & Reel packaging. The lower clamping voltage (648V versus 680.4V) provides tighter voltage regulation, beneficial for sensitive load protection.

Selection should prioritize product availability, packaging requirements (bulk versus Tape & Reel), and operating temperature constraints specific to the application environment.

Frequently Asked Questions (FAQ)

Q: Can SMBJ400A directly replace SMBJ400 in existing designs?

A: Yes. SMBJ400A maintains the same 400V reverse standoff voltage, 900mA peak pulse current, 600W power rating, and DO-214AA package. The lower clamping voltage (648V versus 680.4V) is within acceptable design margins for general-purpose overvoltage protection.

Q: What is the difference between SMBJ400A and SMBJ400A-TP?

A: Both parts are electrically identical. SMBJ400A-TP is supplied in Tape & Reel packaging for automated pick-and-place assembly, while standard SMBJ400A is supplied in bulk. SMBJ400A-TP also specifies an extended operating temperature range to 175°C.

Q: Is TV06B401J-HF compatible with SMBJ400 applications?

A: Yes. TV06B401J-HF meets all critical electrical parameters: 400V reverse standoff, 648V clamping voltage, and 930mA peak pulse current. The slightly higher peak pulse current and lower clamping voltage make it suitable for equivalent circuit protection. Operating temperature range is not specified for this part.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. SMBJ400A, SMBJ400A-TP, and TV06B401J-HF are all ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity ratings, matching the environmental compliance of the original SMBJ400.

Q: Which substitute part should be selected for high-temperature applications?

A: SMBJ400A-TP specifies an operating temperature range of -55°C to 175°C, providing the highest thermal rating among the substitutes. Standard SMBJ400A and TV06B401J-HF are rated to 150°C and unspecified, respectively.

Q: Does packaging affect electrical performance?

A: No. Tape & Reel and bulk packaging formats contain identical die and electrical characteristics. Packaging selection is driven by assembly process requirements and production volume.