SMBJ54A-Q Equivalent & Substitute Parts

Part Overview

The SMBJ54A-Q is an automotive-grade Transient Voltage Suppressor (TVS) diode manufactured by Bourns Inc., designed for telecom applications requiring transient protection. This unidirectional zener diode operates with a 54V reverse standoff voltage and provides 6.9A peak pulse current capability in a surface mount SMB (DO-214AA) package. The component is AEC-Q101 qualified and ROHS3 compliant, making it suitable for automotive and industrial environments. Identifying equivalent substitute parts ensures design flexibility, supply chain continuity, and access to alternative inventory sources while maintaining identical electrical and mechanical performance.

Substiute Parts

SMBJ54A-Q

Bourns Inc.In Stock: 644SMBJ54A-Q Datasheet

Current PartRFQ

SMBJE54AH

Eaton - Electronics DivisionIn Stock: 3947SMBJE54AH Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMBJ54A-Q are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Critical Matching Parameters:

• Voltage - Reverse Standoff (Typ): 54V
• Voltage - Breakdown (Min): 60V
• Voltage - Clamping (Max) @ Ipp: 87.1V
• Current - Peak Pulse (10/1000µs): 6.9A
• Power - Peak Pulse: 600W
• Unidirectional Channels: 1
• Package / Case: DO-214AA, SMB
• Operating Temperature Range: -55°C to 150°C (TJ)
• Mounting Type: Surface Mount
• Type: Zener

The SMBJE54AH from Eaton - Electronics Division meets all critical electrical parameters and mechanical specifications, making it a direct functional equivalent. Both components share identical voltage ratings, current handling capacity, thermal operating range, and package configuration. Both are automotive-grade, AEC-Q101 qualified, and ROHS3 compliant, ensuring compatibility in automotive and industrial telecom applications.

Parameter Comparison

Engineering Selection Recommendations

Both the SMBJ54A-Q and SMBJE54AH are active, automotive-grade components with identical electrical specifications and AEC-Q101 qualification. Selection between these parts should be based on:

Supply Chain Availability: The SMBJE54AH (Eaton) currently has higher inventory availability (3922 pcs) compared to the SMBJ54A-Q (604 pcs), making it suitable for high-volume production requirements or extended lead-time mitigation.

Compliance Status: Both components are ROHS3 compliant with MSL 1 rating. The SMBJ54A-Q carries REACH Affected status, while the SMBJE54AH is REACH Unaffected. For applications requiring REACH compliance documentation, the SMBJE54AH is the preferred selection.

Manufacturer Qualification: Both parts meet automotive-grade standards and AEC-Q101 qualification, ensuring reliability in automotive and industrial telecom environments.

Frequently Asked Questions (FAQ)

Q: Can the SMBJE54AH replace the SMBJ54A-Q in existing designs?

A: Yes. Both components share identical electrical parameters (54V standoff, 87.1V clamping, 6.9A peak pulse), thermal operating range (-55°C to 150°C), and DO-214AA SMB package configuration. No circuit modifications are required.

Q: Are there package compatibility concerns when substituting these parts?

A: No. Both the SMBJ54A-Q and SMBJE54AH use the DO-214AA (SMB) surface mount package with identical pinout and footprint. PCB layout and reflow soldering parameters remain unchanged.

Q: What is the difference in REACH compliance between these parts?

A: The SMBJ54A-Q is REACH Affected, requiring compliance documentation for European Union applications. The SMBJE54AH is REACH Unaffected, simplifying regulatory documentation for EU markets. Both are ROHS3 compliant.

Q: Do both parts have the same moisture sensitivity rating?

A: Yes. Both components have MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions during storage or handling.

Q: Are both parts suitable for automotive applications?

A: Yes. Both the SMBJ54A-Q and SMBJE54AH are automotive-grade components with AEC-Q101 qualification, meeting automotive reliability and quality standards for telecom transient protection circuits.