SMBJ8.5A Equivalent & Substitute Parts

Part Overview

The SMBJ8.5A is a unidirectional transient voltage suppressor (TVS) diode manufactured by Taiwan Semiconductor Corporation. This surface mount component operates as a Zener-type TVS diode in the DO-214AA (SMB) package and is designed for general-purpose transient voltage suppression applications. The device is classified as Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Alternative equivalent parts are identified based on matching electrical specifications, package compatibility, and operational parameters to ensure seamless integration in circuit designs requiring TVS protection.

Substiute Parts

SMBJ8.5A

Taiwan Semiconductor CorporationIn Stock: 44396SMBJ8.5A Datasheet

Current PartRFQ

SMBJ8.5A

Taiwan Semiconductor CorporationIn Stock: 44396SMBJ8.5A Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMBJ8.5A transient voltage suppressor is determined by strict equivalence across the following critical parameters:

Electrical Specifications:

• Reverse standoff voltage: 8.5V (Typ)
• Breakdown voltage minimum: 9.44V
• Clamping voltage maximum at peak pulse current: 14.4V
• Peak pulse current rating: 43A (10/1000µs pulse)
• Peak pulse power dissipation: 600W

Physical and Mechanical Requirements:

• Package type: DO-214AA (SMB) surface mount
• Unidirectional configuration: Single channel
• Device type: Zener TVS diode

Compliance and Regulatory:

• RoHS3 compliance status
• REACH unaffected classification
• Moisture sensitivity level: MSL 1

Substitute parts must match all electrical parameters within the specified tolerances, maintain identical package and mounting characteristics, and satisfy the same regulatory compliance requirements. No deviations in voltage ratings, current handling, or thermal specifications are permitted for direct substitution.

Parameter Comparison

Engineering Selection Recommendations

The SMBJ8.5A transient voltage suppressor is an Active product with full regulatory compliance across RoHS3 and REACH standards. The identified substitute part maintains complete electrical and mechanical equivalence with identical specifications across all critical parameters including voltage ratings, current handling capacity, and thermal operating range.

Selection of equivalent SMBJ8.5A components is appropriate for applications requiring unidirectional TVS protection in the 8.5V standoff voltage class. The DO-214AA (SMB) surface mount package ensures compatibility with standard PCB assembly processes and automated placement equipment. The MSL 1 moisture sensitivity rating permits unlimited shelf life without special storage requirements.

Both the main part and substitute maintain Active product status, ensuring continued availability and manufacturing support. RoHS3 compliance and REACH unaffected classification satisfy regulatory requirements for commercial and industrial applications. The 600W peak pulse power rating and 43A peak pulse current capability support transient suppression in general-purpose circuit protection applications.

Frequently Asked Questions (FAQ)

Q: What defines an equivalent substitute for the SMBJ8.5A TVS diode?

A: An equivalent substitute must match all electrical specifications including the 8.5V reverse standoff voltage, 9.44V minimum breakdown voltage, 14.4V maximum clamping voltage, 43A peak pulse current rating, and 600W peak pulse power dissipation. The substitute must also use the identical DO-214AA (SMB) surface mount package, maintain single-channel unidirectional configuration, and satisfy RoHS3 and REACH compliance requirements.

Q: Can the SMBJ8.5A be substituted with TVS diodes from different voltage classes?

A: No. The SMBJ8.5A is specified for 8.5V standoff voltage operation. Substitution with different voltage ratings (such as SMBJ5.0A or SMBJ12A) will result in incorrect circuit protection and potential component failure. Voltage specifications must match exactly.

Q: Is the DO-214AA package interchangeable with other SMB package variants?

A: The DO-214AA package designation specifies the exact physical and electrical interface for the SMBJ8.5A. While DO-214AA is commonly referred to as SMB, only components explicitly rated for DO-214AA package compatibility are suitable substitutes. Package dimensions and lead configurations must match precisely for PCB assembly compatibility.

Q: What is the significance of the MSL 1 moisture sensitivity rating?

A: MSL 1 indicates unlimited moisture sensitivity, meaning the SMBJ8.5A component does not require special moisture control during storage or handling. This classification permits standard warehouse storage conditions without desiccant packaging or controlled humidity environments.

Q: Does the SMBJ8.5A require thermal management in typical applications?

A: The 600W peak pulse power rating applies to transient suppression events with 10/1000µs pulse duration. Thermal management requirements depend on the frequency and duration of transient events in the specific application. The -55°C to 150°C operating temperature range defines the component's thermal limits under continuous operation.

Q: Are there any application restrictions for the SMBJ8.5A based on its Active product status?

A: Active product status indicates the component is in full production with manufacturer support. No application restrictions exist based on product status. The component is suitable for new designs and ongoing production applications requiring 8.5V TVS protection.