SMBJ440C Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SMBJ440C is a bidirectional Zener-type transient voltage suppressor diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. Housed in a DO-214AA (SMB) surface-mount package, this component provides 440V reverse standoff voltage with 748.65V maximum clamping voltage at peak pulse current of 900mA. The SMBJ440C is classified as obsolete, necessitating identification of active equivalent and substitute parts that maintain electrical and mechanical compatibility for new designs and production continuity.

Substiute Parts

SMBJ440C

Littelfuse Inc.In Stock: 882SMBJ440C Datasheet

Current PartRFQ

SMBJ440CA

SMC Diode SolutionsIn Stock: 3487SMBJ440CA Datasheet

DirectRFQ

SMBJ440CA

SMC Diode SolutionsIn Stock: 3487SMBJ440CA Datasheet

DirectRFQ

SMBJ440CA-TP

Micro Commercial CoIn Stock: 864SMBJ440CA-TP Datasheet

MFR RecommendedRFQ

TV06B441JB-HF

Comchip TechnologyIn Stock: 767TV06B441JB-HF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMBJ440C is determined by strict equivalence across the following critical parameters:

• Voltage - Reverse Standoff (Typ): 440V (all substitutes match)
• Current - Peak Pulse (10/1000µs): 900mA nominal (primary substitutes match; one variant at 840mA)
• Power - Peak Pulse: 600W (all substitutes match)
• Package / Case: DO-214AA, SMB (all substitutes match)
• Mounting Type: Surface Mount (all substitutes match)
• Type: Zener, Bidirectional (all substitutes match)

The identified substitute parts maintain the same reverse standoff voltage and package configuration. Variations in clamping voltage (713V vs. 748.65V) and peak pulse current (840mA vs. 900mA) represent acceptable deviations within the functional envelope for general-purpose transient suppression applications, provided circuit design margins accommodate these differences.

Parameter Comparison

Engineering Selection Recommendations

SMBJ440CA (SMC Diode Solutions) and SMBJ440CA-TP (Micro Commercial Co) are the primary active substitutes for the obsolete SMBJ440C. Both maintain identical reverse standoff voltage (440V), peak pulse current (900mA), and power dissipation (600W) specifications. Both are ROHS3 compliant and carry MSL 1 ratings. The SMBJ440CA-TP variant offers an extended operating temperature range (-55°C ~ 175°C) compared to the standard SMBJ440CA (-55°C ~ 150°C), providing additional thermal margin for high-temperature applications.

TV06B441JB-HF (Comchip Technology) is a secondary substitute option. While it maintains the 440V reverse standoff voltage and 600W power rating, the peak pulse current specification is reduced to 840mA (versus 900mA for primary substitutes). This component is ROHS3 compliant and carries MSL 1 rating. Selection of this part requires verification that circuit design margins accommodate the 60mA reduction in peak pulse current handling capability.

All substitute parts are available in active production status, ensuring supply chain continuity and long-term availability compared to the obsolete SMBJ440C.

Frequently Asked Questions (FAQ)

Q: Can SMBJ440CA directly replace SMBJ440C in existing designs?

A: Yes. The SMBJ440CA maintains identical reverse standoff voltage (440V), peak pulse current (900mA), and power dissipation (600W) specifications. Both use the DO-214AA (SMB) surface-mount package with identical pinout and footprint compatibility. The primary difference is the clamping voltage (713V vs. 748.65V), which represents a 4.8% reduction. Circuit designs with adequate voltage margin accommodate this variation.

Q: What is the difference between SMBJ440CA and SMBJ440CA-TP?

A: Both parts are electrically identical with matching reverse standoff voltage, breakdown voltage, clamping voltage, and peak pulse current specifications. The primary distinction is the operating temperature range: SMBJ440CA operates from -55°C to 150°C, while SMBJ440CA-TP extends to 175°C. The SMBJ440CA-TP is supplied in Bulk packaging, whereas SMBJ440CA packaging is not specified. Selection depends on thermal environment requirements.

Q: Is TV06B441JB-HF a suitable substitute for SMBJ440C?

A: TV06B441JB-HF maintains the 440V reverse standoff voltage and 600W power dissipation but specifies 840mA peak pulse current versus 900mA for the original part. This represents a 6.7% reduction in peak pulse current handling. Substitution is permissible only if circuit design analysis confirms that transient pulse currents remain within the 840mA limit with adequate safety margin.

Q: Are all substitute parts RoHS compliant?

A: SMBJ440CA, SMBJ440CA-TP, and TV06B441JB-HF are all ROHS3 compliant. Moisture sensitivity level (MSL) is rated as 1 (Unlimited) for SMBJ440CA, SMBJ440CA-TP, and TV06B441JB-HF, indicating no moisture sensitivity restrictions during storage and handling.

Q: What packaging options are available for substitute parts?

A: SMBJ440CA-TP is supplied in Bulk packaging. SMBJ440CA packaging is not specified in available data. TV06B441JB-HF is supplied in Tape & Reel (TR) format. Packaging selection depends on production volume and assembly process requirements.