SMBJ54 Equivalent & Substitute Parts

Part Overview

The SMBJ54 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. Featuring a 54V reverse standoff voltage and 91.46V maximum clamping voltage with 6.9A peak pulse current capability in a surface-mount DO-214AA (SMB) package, this component provides transient suppression in a compact form factor.

The SMBJ54 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this TVS diode specification.

Substiute Parts

SMBJ54

Littelfuse Inc.In Stock: 905SMBJ54 Datasheet

Current PartRFQ

SMBJ54A

MDDIn Stock: 3461SMBJ54A Datasheet

DirectRFQ

SMBJ54A

MDDIn Stock: 3461SMBJ54A Datasheet

DirectRFQ

SMBJ54A

MDDIn Stock: 3461SMBJ54A Datasheet

DirectRFQ

SMBJ54A-13-F

Diodes IncorporatedIn Stock: 15364SMBJ54A-13-F Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SMBJ54 is determined by the following critical parameters:

• Voltage - Reverse Standoff (Typ): 54V
• Current - Peak Pulse (10/1000µs): 6.9A
• Power - Peak Pulse: 600W
• Package / Case: DO-214AA, SMB
• Mounting Type: Surface Mount
• Unidirectional Channels: 1

Substitute parts must maintain identical reverse standoff voltage, peak pulse current, peak pulse power rating, and package configuration to ensure functional and mechanical compatibility. Variations in voltage clamping characteristics and operating temperature ranges are permissible within the constraints of the application circuit design.

Parameter Comparison

Engineering Selection Recommendations

Both SMBJ54A (MDD) and SMBJ54A-13-F (Diodes Incorporated) are active product alternatives to the obsolete SMBJ54. Selection between these substitutes is based on the following factors:

SMBJ54A-13-F (Diodes Incorporated) is the manufacturer-recommended substitute. This part maintains active product status, carries ROHS3 and REACH compliance certifications, and offers the widest operating temperature range (-55 to 150°C), providing enhanced thermal margin for demanding applications.

SMBJ54A (MDD) is an equivalent alternative with active product status and ROHS3 compliance. This part operates within a narrower temperature range (-50 to 150°C) and is suitable for applications where the lower temperature limit of -50°C is acceptable.

Both substitutes exhibit lower maximum clamping voltage (87.1V versus 91.46V) and higher minimum breakdown voltage (60V versus 56.84V) compared to the original SMBJ54. These parameter variations remain within acceptable substitution tolerances for general-purpose TVS applications, provided circuit design margins accommodate the modified voltage characteristics.

Frequently Asked Questions (FAQ)

Q: Can SMBJ54A or SMBJ54A-13-F be used as direct replacements for SMBJ54 in existing designs?

A: Yes. Both substitute parts maintain identical reverse standoff voltage (54V), peak pulse current (6.9A), peak pulse power (600W), and package configuration (DO-214AA, SMB). Functional compatibility is established. However, the lower clamping voltage (87.1V versus 91.46V) must be evaluated within the specific circuit protection requirements.

Q: What is the difference between SMBJ54A and SMBJ54A-13-F?

A: Both parts share identical electrical specifications for reverse standoff voltage, peak pulse current, and power rating. The primary differences are manufacturer (MDD versus Diodes Incorporated), operating temperature range (-50 to 150°C versus -55 to 150°C), and product availability. SMBJ54A-13-F is the manufacturer-recommended option.

Q: Are there packaging differences between these parts?

A: All three parts use the DO-214AA (SMB) surface-mount package. SMBJ54A is supplied in Tape & Reel (TR) packaging, as is SMBJ54A-13-F. Package compatibility is confirmed for standard surface-mount assembly processes.

Q: What compliance certifications apply to these substitute parts?

A: All three parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity ratings. SMBJ54A-13-F and SMBJ54A additionally carry REACH Unaffected status, confirming regulatory compliance for European and international markets.

Q: How do the voltage characteristics compare?

A: The original SMBJ54 specifies a minimum breakdown voltage of 56.84V and maximum clamping voltage of 91.46V. Both substitutes specify 60V minimum breakdown and 87.1V maximum clamping. The substitute parts exhibit tighter voltage regulation with lower clamping levels, which may provide improved protection margins in some applications but requires circuit validation.