SMBJ40A-HRA Equivalent & Substitute Parts

Part Overview

The SMBJ40A-HRA is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component operates with a 40V reverse standoff voltage and provides 64.5V maximum clamping voltage at peak pulse current of 9.3A. The part is actively produced and RoHS3 compliant with unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified based on matching electrical specifications (voltage ratings, peak pulse current, power dissipation) and mechanical compatibility (DO-214AA/SMB package, surface-mount configuration). Alternative sources ensure design flexibility, supply chain continuity, and application-specific requirements such as automotive qualification or extended temperature ranges.

Substiute Parts

SMBJ40A-HRA

Littelfuse Inc.In Stock: 1013SMBJ40A-HRA Datasheet

Current PartRFQ

SMBJ40A

MDDIn Stock: 17458SMBJ40A Datasheet

DirectRFQ

ATV06B400J-HF

Comchip TechnologyIn Stock: 3630ATV06B400J-HF Datasheet

DirectRFQ

SMBJ40A

MDDIn Stock: 17458SMBJ40A Datasheet

DirectRFQ

SMBJ40A-13-F

Diodes IncorporatedIn Stock: 189781SMBJ40A-13-F Datasheet

DirectRFQ

SMBJ40A-E3/52

Vishay General Semiconductor - Diodes DivisionIn Stock: 29501SMBJ40A-E3/52 Datasheet

DirectRFQ

SMBJ40A-TP

Micro Commercial CoIn Stock: 8503SMBJ40A-TP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following electrical and mechanical parameters:

Voltage - Reverse Standoff (Typ): 40V Voltage - Breakdown (Min): 44.4V Voltage - Clamping (Max) @ Ipp: 64.5V Current - Peak Pulse (10/1000µs): 9.3A Power - Peak Pulse: 600W Package / Case: DO-214AA, SMB Mounting Type: Surface Mount Unidirectional Channels: 1 RoHS Status: ROHS3 Compliant Moisture Sensitivity Level (MSL): 1 (Unlimited)

All identified substitute parts match these core parameters. Variations in operating temperature range, packaging format (Tape & Reel vs. Cut Tape), and manufacturer-specific certifications (such as AEC-Q101 automotive qualification) do not affect electrical interchangeability but may influence selection based on application requirements and supply chain constraints.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts listed maintain full electrical and mechanical equivalence to the SMBJ40A-HRA. Selection among alternatives should be based on the following factors:

Supply Availability: MDD SMBJ40A (17,400 pcs), Diodes Incorporated SMBJ40A-13-F (189,737 pcs), and Vishay SMBJ40A-E3/52 (29,400 pcs) offer substantial inventory levels. Micro Commercial Co SMBJ40A-TP (8,442 pcs) and Comchip Technology ATV06B400J-HF (3,593 pcs) provide alternative sources with lower stock quantities.

Temperature Range: The SMBJ40A-HRA operates from -65°C to 150°C. Substitute parts operate within -50°C to -55°C minimum temperatures, which is acceptable for most general-purpose applications. The Micro Commercial Co SMBJ40A-TP extends to 175°C maximum, providing additional thermal margin for high-temperature environments.

Automotive Qualification: The Comchip Technology ATV06B400J-HF carries AEC-Q101 qualification, suitable for automotive applications requiring this certification.

Packaging Format: All parts are available in DO-214AA/SMB surface-mount package. Packaging options (Tape & Reel vs. Cut Tape) do not affect electrical performance and should be selected based on assembly process requirements.

Product Status: All parts are actively produced and RoHS3 compliant, ensuring long-term availability and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can SMBJ40A-HRA be directly replaced with any of the listed substitute parts?

A: Yes. All substitute parts match the critical electrical parameters (40V reverse standoff, 44.4V breakdown minimum, 64.5V clamping maximum, 9.3A peak pulse current, 600W peak power) and the DO-214AA/SMB surface-mount package. Direct PCB-level substitution is electrically valid.

Q: What is the difference between the operating temperature ranges?

A: The SMBJ40A-HRA operates from -65°C to 150°C. Most substitutes operate from -50°C to -55°C minimum. This difference does not affect substitution in applications where the minimum operating temperature requirement is -50°C or higher. For applications requiring -65°C operation, the SMBJ40A-HRA is the appropriate choice.

Q: Why does the Micro Commercial Co SMBJ40A-TP have a higher maximum temperature (175°C)?

A: Extended maximum temperature rating reflects the manufacturer's thermal design and qualification testing. This does not change electrical equivalence but provides additional thermal margin for high-temperature circuit environments.

Q: Is the Comchip Technology ATV06B400J-HF suitable for automotive applications?

A: The ATV06B400J-HF carries AEC-Q101 automotive qualification. It is suitable for automotive applications requiring this certification. Other parts listed do not carry automotive qualification markings.

Q: Do packaging format differences (Tape & Reel vs. Cut Tape) affect electrical performance?

A: No. Packaging format affects only handling, storage, and assembly logistics. Electrical performance and component specifications remain identical regardless of packaging format.

Q: Which substitute part offers the best inventory availability?

A: Diodes Incorporated SMBJ40A-13-F offers the highest inventory level at 189,737 pieces, followed by Vishay SMBJ40A-E3/52 at 29,400 pieces and MDD SMBJ40A at 17,400 pieces.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the SMBJ40A-HRA specification.