SMBJ400C Transient Voltage Suppressor - Equivalent & Substitute Parts

Part Overview

The SMBJ400C is a bidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 400V reverse standoff voltage rating with 680.4V maximum clamping voltage and 900mA peak pulse current capability in a DO-214AA (SMB) package. The SMBJ400C is classified as obsolete, making identification of functionally equivalent active alternatives necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	400	V
Voltage - Breakdown (Min)	423.45	V
Voltage - Clamping (Max) @ Ipp	680.4	V
Current - Peak Pulse (10/1000µs)	900	mA
Power - Peak Pulse	600	W
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature Range	-65°C ~ 150°C	TJ
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SMBJ400C is determined by strict equivalence across the following critical parameters:

Voltage Rating: Reverse standoff voltage of 400V (nominal)
Package Type: DO-214AA (SMB) surface-mount package
Bidirectional Configuration: Single-channel bidirectional Zener topology
Peak Pulse Current: 900mA minimum at 10/1000µs pulse width
Peak Pulse Power: 600W dissipation capability
Clamping Voltage: Maximum 680.4V at peak pulse current (Ipp)
Compliance: ROHS3 compliant, MSL 1 rating

All substitute parts listed maintain these electrical and mechanical specifications within the defined tolerances, ensuring direct functional replacement in existing circuit designs.

Parameter Comparison

Parameter	SMBJ400C (Littelfuse)	SMBJ400CA (Good-Ark)	SMBJ400CA-TP (Micro Commercial)	TV06B401JB-HF (Comchip)
Voltage - Reverse Standoff (Typ)	400V	400V	400V	400V
Voltage - Breakdown (Min)	423.45V	447V	447V	447V
Voltage - Clamping (Max) @ Ipp	680.4V	648V	648V	648V
Current - Peak Pulse (10/1000µs)	900mA	900mA	900mA	930mA
Power - Peak Pulse	600W	600W	600W	600W
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Operating Temperature Range	-65°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 175°C	Not specified
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All three substitute parts—SMBJ400CA (Good-Ark Semiconductor), SMBJ400CA-TP (Micro Commercial Co), and TV06B401JB-HF (Comchip Technology)—are active products with ROHS3 compliance and MSL 1 ratings, making them suitable replacements for the obsolete SMBJ400C.

SMBJ400CA (Good-Ark Semiconductor) provides direct electrical equivalence with 648V clamping voltage and 900mA peak pulse current. Operating temperature range of -55°C to 150°C covers standard industrial applications. Inventory availability of 59,400 units supports high-volume production requirements.

SMBJ400CA-TP (Micro Commercial Co) offers the same electrical specifications as the Good-Ark variant with an extended operating temperature range of -55°C to 175°C, providing additional thermal margin for demanding environments. Inventory of 2,100 units is available. This part is designated as manufacturer-recommended.

TV06B401JB-HF (Comchip Technology) maintains electrical equivalence with a slightly higher peak pulse current rating of 930mA. Operating temperature range is not specified in available documentation. Inventory of 932 units is available. This part is also designated as manufacturer-recommended.

All substitute parts are packaged in DO-214AA (SMB) format with Tape & Reel (TR) packaging, ensuring compatibility with automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can SMBJ400CA, SMBJ400CA-TP, and TV06B401JB-HF be used interchangeably with SMBJ400C?

A: Yes. All three substitute parts maintain the critical electrical parameters: 400V reverse standoff voltage, 900mA (or higher) peak pulse current, 600W peak pulse power, and DO-214AA package configuration. They are functionally equivalent for general-purpose transient voltage suppression applications.

Q: What is the difference between SMBJ400CA and SMBJ400CA-TP?

A: Both parts are manufactured to the same electrical specifications with identical clamping voltage (648V) and peak pulse current (900mA). The primary difference is operating temperature range: SMBJ400CA-TP extends to 175°C junction temperature versus 150°C for SMBJ400CA. SMBJ400CA-TP is designated as manufacturer-recommended.

Q: How does TV06B401JB-HF differ from the Good-Ark and Micro Commercial alternatives?

A: TV06B401JB-HF maintains the same 400V standoff voltage and 648V clamping voltage but features a slightly higher peak pulse current rating of 930mA compared to 900mA for the other substitutes. This provides additional current handling margin. Operating temperature range is not specified in available data.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. SMBJ400CA, SMBJ400CA-TP, and TV06B401JB-HF are all ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the compliance profile of the original SMBJ400C.

Q: What packaging formats are available for these substitute parts?

A: All substitute parts are supplied in Tape & Reel (TR) packaging in DO-214AA (SMB) surface-mount configuration, compatible with standard pick-and-place assembly equipment.

Q: Why is the SMBJ400C obsolete?

A: The SMBJ400C is classified as obsolete by Littelfuse Inc. The listed substitute parts from Good-Ark Semiconductor, Micro Commercial Co, and Comchip Technology are active products offering equivalent or superior electrical performance and are recommended for new designs and production continuity.

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