SMBJ440 Equivalent & Substitute Parts

Part Overview

The SMBJ440 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 440V reverse standoff voltage rating and 748.65V maximum clamping voltage with 900mA peak pulse current capability in a surface-mount DO-214AA (SMB) package. The SMBJ440 is classified as obsolete, necessitating identification of active equivalent parts that maintain electrical and mechanical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	440	V
Voltage - Breakdown (Min)	465.75	V
Voltage - Clamping (Max) @ Ipp	748.65	V
Current - Peak Pulse (10/1000µs)	900	mA
Power - Peak Pulse	600	W
Operating Temperature Range	-65 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	DO-214AA (SMB)	—
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution of the SMBJ440 is determined by strict equivalence across the following critical parameters:

Voltage - Reverse Standoff (Typ): Must equal 440V to maintain circuit protection threshold
Package / Case: Must be DO-214AA (SMB) for mechanical and thermal compatibility
Mounting Type: Must be Surface Mount for PCB assembly compatibility
Type: Must be Zener diode for functional equivalence
Unidirectional Channels: Must be 1 channel for circuit topology compatibility
Power - Peak Pulse: Must be 600W minimum to handle transient energy dissipation

Substitute parts are grouped based on matching these parameters. Variations in clamping voltage, breakdown voltage, and peak pulse current within the same voltage class are acceptable provided they remain within the specified ranges for the application circuit.

Parameter Comparison

Parameter	SMBJ440 (Littelfuse)	SMBJ440A (Meritek)	SMBJ440A-TP (Micro Commercial Co)	TV06B441J-HF (Comchip Technology)
Voltage - Reverse Standoff (Typ)	440V	440V	440V	440V
Voltage - Breakdown (Min)	465.75V	492V	492V	492V
Voltage - Clamping (Max) @ Ipp	748.65V	713V	713V	713V
Current - Peak Pulse (10/1000µs)	900mA	840mA	900mA	840mA
Power - Peak Pulse	600W	600W	600W	600W
Operating Temperature Range	-65 to 150°C	-55 to 150°C	-55 to 175°C	Not specified
Package / Case	DO-214AA (SMB)	DO-214AA (SMB)	DO-214AA (SMB)	DO-214AA (SMB)
Type	Zener	Zener	Zener	Zener
Unidirectional Channels	1	1	1	1
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active

Engineering Selection Recommendations

All three substitute parts (SMBJ440A, SMBJ440A-TP, and TV06B441J-HF) meet the core electrical and mechanical requirements for direct substitution of the obsolete SMBJ440. Selection should be based on the following factors:

SMBJ440A (Meritek): Active product status with ROHS3 compliance and REACH unaffected designation. Suitable for applications requiring standard operating temperature range (-55 to 150°C). High inventory availability (56,100 pcs) supports production continuity.

SMBJ440A-TP (Micro Commercial Co): Manufacturer-recommended substitute with extended operating temperature range (-55 to 175°C), matching the peak pulse current of the original part (900mA). ROHS3 compliant and REACH unaffected. Recommended for applications requiring elevated temperature performance or exact current matching.

TV06B441J-HF (Comchip Technology): Active product with ROHS3 compliance and REACH unaffected status. Suitable for general-purpose applications. Operating temperature range not specified in available data.

All substitute parts carry EAR99 export classification and HTSUS code 8541.10.0080, maintaining regulatory consistency with the original component.

Frequently Asked Questions (FAQ)

Q: Can SMBJ440A be used as a direct replacement for SMBJ440?

A: Yes. Both parts share identical reverse standoff voltage (440V), package type (DO-214AA/SMB), and power rating (600W). The SMBJ440A is an active product manufactured by Meritek with ROHS3 compliance, making it suitable for direct substitution in new designs and production.

Q: What is the difference between SMBJ440A and SMBJ440A-TP?

A: Both are SMBJ440A variants with identical electrical ratings. The primary difference is the extended operating temperature range of SMBJ440A-TP (-55 to 175°C versus -55 to 150°C) and peak pulse current matching the original SMBJ440 at 900mA. SMBJ440A-TP is the manufacturer-recommended substitute when temperature performance is critical.

Q: Are all substitute parts available in the same package?

A: Yes. All substitute parts use the DO-214AA (SMB) surface-mount package, ensuring mechanical and thermal compatibility with existing PCB designs. No layout modifications are required.

Q: What compliance certifications apply to these substitute parts?

A: All substitute parts are ROHS3 compliant. SMBJ440A and SMBJ440A-TP carry REACH unaffected designation. TV06B441J-HF also carries REACH unaffected status. All parts are classified as EAR99 for export purposes.

Q: How do the clamping voltages compare between the original and substitutes?

A: The original SMBJ440 specifies 748.65V maximum clamping voltage. All substitute parts specify 713V maximum clamping voltage. Both values fall within acceptable transient suppression performance for 440V standoff applications. Circuit validation should confirm compatibility with specific overvoltage transient profiles.

Q: Which substitute part should be selected for new production?

A: SMBJ440A-TP is the manufacturer-recommended choice, offering extended temperature range and current matching. SMBJ440A provides equivalent electrical performance with standard temperature range and higher inventory availability. Both are active products with full compliance certifications.

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