SMBJ18A-HRA Equivalent & Substitute Parts

Part Overview

The SMBJ18A-HRA is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection in surface-mount applications. This component features a 18V reverse standoff voltage with a 29.2V maximum clamping voltage and 20.6A peak pulse current capability in a DO-214AA (SMB) package. The part is currently in active production status with full RoHS3 compliance and unlimited moisture sensitivity rating.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained across the specified parameter set.

Substiute Parts

SMBJ18A-HRA

Littelfuse Inc.In Stock: 876SMBJ18A-HRA Datasheet

Current PartRFQ

SMBJ18A

EVVO SemiIn Stock: 35118SMBJ18A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SMBJ18A-HRA is determined by matching the following critical electrical parameters:

• Voltage - Reverse Standoff (Typ): 18V
• Voltage - Breakdown (Min): 20V
• Voltage - Clamping (Max) @ Ipp: 29.2V
• Current - Peak Pulse (10/1000µs): 20.6A
• Power - Peak Pulse: 600W
• Operating Temperature Range: -65°C to 150°C (TJ)
• Type: Zener, Unidirectional
• Mounting Type: Surface Mount

The SMBJ18A manufactured by EVVO Semi meets all specified electrical parameters. Package variations between DO-214AA (SMB) and DO-214AC (SMA) represent acceptable mechanical substitutes for surface-mount applications where footprint compatibility is maintained in the target circuit design.

Parameter Comparison

Engineering Selection Recommendations

Both the SMBJ18A-HRA (Littelfuse Inc.) and SMBJ18A (EVVO Semi) are active production components with identical electrical specifications and full regulatory compliance. Selection between these parts should be based on:

• Packaging availability: SMBJ18A-HRA is supplied in Tape & Reel (TR) format; SMBJ18A is available in Cut Tape (CT) and Digi-Reel® formats
• Inventory requirements: SMBJ18A-HRA has 780 pieces in stock; SMBJ18A has 35,100 pieces in stock
• Package case compatibility: DO-214AA (SMB) versus DO-214AC (SMA) footprints must be verified for PCB layout compatibility

Both parts maintain RoHS3 compliance, unlimited moisture sensitivity rating, and identical export classification (EAR99).

Frequently Asked Questions (FAQ)

Q: Can SMBJ18A (EVVO Semi) directly replace SMBJ18A-HRA (Littelfuse) in existing designs?

A: Yes, provided the PCB footprint accommodates the package case difference. SMBJ18A-HRA uses DO-214AA (SMB) package, while SMBJ18A uses DO-214AC (SMA) package. Both are surface-mount packages with identical electrical performance. Verify footprint compatibility before implementation.

Q: What are the key electrical parameters that define substitution eligibility?

A: The critical parameters are: 18V reverse standoff voltage, 20V minimum breakdown voltage, 29.2V maximum clamping voltage, 20.6A peak pulse current, and 600W peak pulse power. All substitute parts must match these specifications exactly.

Q: Are there compliance or certification differences between the two parts?

A: No. Both SMBJ18A-HRA and SMBJ18A are RoHS3 compliant, REACH unaffected, classified as EAR99, and carry identical HTSUS codes. Both have MSL rating of 1 (unlimited).

Q: What is the difference between DO-214AA and DO-214AC packages?

A: Both are surface-mount diode packages in the SMB/SMA family. DO-214AA (SMB) and DO-214AC (SMA) have different physical dimensions and footprints. Circuit board layout must accommodate the selected package variant.

Q: Can I use either part interchangeably in my application?

A: Electrical interchangeability is confirmed. Mechanical interchangeability depends on PCB footprint design. Verify that your circuit board layout supports the specific package case (DO-214AA or DO-214AC) before component selection.