SMAJ85CE3/TR13 Equivalent & Substitute Parts

Part Overview

The SMAJ85CE3/TR13 is a transient voltage suppressor (TVS) diode manufactured by Microchip Technology, designed for general-purpose overvoltage protection in surface-mount applications. This bidirectional zener diode operates with an 85V reverse standoff voltage and provides clamping at 151V maximum, with a peak pulse current rating of 3.3A (10/1000µs). The component is housed in a DO-214AC (SMA) package and is supplied in Tape & Reel format. The part maintains Active product status and is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1). Equivalent and substitute parts are identified based on matching electrical characteristics within the 85V voltage class and compatible surface-mount packaging, enabling direct replacement in circuit designs where performance parameters align.

Substiute Parts

SMAJ85CE3/TR13

Microchip TechnologyIn Stock: 638SMAJ85CE3/TR13 Datasheet

Current PartRFQ

SMA6J85CA-TR

STMicroelectronicsIn Stock: 3852SMA6J85CA-TR Datasheet

SimilarRFQ

SMAJ85CA

MeritekIn Stock: 37142SMAJ85CA Datasheet

SimilarRFQ

SMAJ85CA

MeritekIn Stock: 37142SMAJ85CA Datasheet

SimilarRFQ

SMAJ85CA-13-F

Diodes IncorporatedIn Stock: 2665SMAJ85CA-13-F Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMAJ85CE3/TR13 are qualified based on the following critical parameters:

Voltage Class Matching: All substitute parts maintain an 85V reverse standoff voltage (typical) with breakdown voltages between 94V and 94.4V (minimum), ensuring equivalent circuit protection thresholds.

Package Compatibility: All substitutes utilize the DO-214AC (SMA) surface-mount package, enabling direct PCB placement without layout modifications.

Bidirectional Configuration: All parts feature single-channel bidirectional zener diode topology for symmetric overvoltage suppression.

Compliance Requirements: All substitutes maintain RoHS3 compliance and MSL 1 (unlimited) moisture sensitivity rating, meeting environmental and manufacturing standards.

Application Scope: All parts are classified for general-purpose transient voltage suppression with no power line protection designation.

Substitutes differ in peak pulse current ratings (2.9A to 22.5A), clamping voltages (137V to 146V), and power dissipation capabilities (400W to 600W). Selection depends on specific circuit current and energy absorption requirements within the 85V protection class.

Parameter Comparison

Engineering Selection Recommendations

SMAJ85CE3/TR13 (Microchip Technology) — Primary Reference

The original part is Active status with established supply (626 pcs in stock). Microchip Technology maintains full RoHS3 compliance and MSL 1 rating. This part is suitable for applications requiring 3.3A peak pulse current and 151V clamping voltage within the -65°C to 150°C operating range.

SMA6J85CA-TR (STMicroelectronics) — High Current Alternative

This substitute is Active status with robust inventory (3800 pcs). STMicroelectronics SMA6J series (TRANSIL™) provides 22.5A peak pulse current (8/20µs pulse definition) and 600W power dissipation, exceeding the original part's current handling. Clamping voltage is 146V. Operating temperature extends to 175°C (TJ), providing wider thermal margin. RoHS3 and MSL 1 compliant. Select this part for applications requiring higher transient current absorption or extended temperature operation.

SMAJ85CA (Meritek) — Standard Equivalent

This substitute is Active status with high inventory availability (37,100 pcs). Meritek SMAJ series provides 2.92A peak pulse current and 137V clamping voltage, closely matching the original part's performance envelope. Operating temperature range is -55°C to 150°C. RoHS3 and MSL 1 compliant. Select this part for cost-optimized designs where current and clamping specifications are within acceptable tolerance.

SMAJ85CA-13-F (Diodes Incorporated) — Direct Replacement

This substitute is Active status with adequate inventory (2600 pcs). Diodes Incorporated part provides 2.9A peak pulse current and 137V clamping voltage, nearly identical to the Meritek equivalent. Operating temperature range is -55°C to 150°C (TJ). RoHS3 and MSL 1 compliant. Supplied in Tape & Reel format matching the original packaging. Select this part for direct substitution in existing designs with established supply chain relationships.

All substitutes maintain the 85V voltage class, DO-214AC (SMA) package, and general-purpose application classification. Selection depends on specific circuit requirements for peak current handling, clamping voltage tolerance, and operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can the SMA6J85CA-TR substitute for the SMAJ85CE3/TR13 in all applications?

A: The SMA6J85CA-TR is electrically compatible within the 85V voltage class and uses the same DO-214AC (SMA) package. However, it provides significantly higher peak pulse current (22.5A vs. 3.3A) and lower clamping voltage (146V vs. 151V). Substitution is valid for applications where the circuit can tolerate lower clamping voltage and does not require the original part's specific current rating. Verify circuit protection requirements before selection.

Q: What is the difference between the Meritek SMAJ85CA and Diodes Incorporated SMAJ85CA-13-F?

A: Both parts share identical electrical specifications: 85V standoff voltage, 137V clamping voltage, and approximately 2.9A peak pulse current. The primary difference is manufacturer and packaging designation. Diodes Incorporated supplies the part in Tape & Reel format, while Meritek packaging is not specified. Both are RoHS3 compliant with MSL 1 rating. Selection depends on supply chain availability and packaging requirements.

Q: Why does the SMAJ85CE3/TR13 have a higher clamping voltage (151V) than some substitutes (137V)?

A: Clamping voltage variation within the 85V voltage class reflects manufacturing tolerance and design differences across manufacturers. The SMAJ85CE3/TR13 clamps at 151V maximum, while Meritek and Diodes Incorporated parts clamp at 137V. Both values are within acceptable range for 85V protection class applications. Select based on circuit tolerance for transient voltage peaks.

Q: Are all substitute parts available in Tape & Reel packaging?

A: The SMAJ85CE3/TR13 and SMA6J85CA-TR are explicitly supplied in Tape & Reel (TR) format. The Meritek SMAJ85CA does not specify packaging format. The Diodes Incorporated SMAJ85CA-13-F is supplied in Tape & Reel format. Verify packaging requirements for automated assembly processes before final part selection.

Q: What is the operating temperature difference between the original part and substitutes?

A: The SMAJ85CE3/TR13 operates from -65°C to 150°C (TJ). The SMA6J85CA-TR extends to 175°C (TJ), providing 25°C additional thermal margin. Meritek and Diodes Incorporated parts operate from -55°C to 150°C, matching the upper limit but with a 10°C higher lower temperature bound. Select based on circuit thermal environment requirements.

Q: Can these parts be used interchangeably on the same PCB without layout changes?

A: Yes. All parts use the DO-214AC (SMA) surface-mount package with identical footprint dimensions. PCB layout modifications are not required for substitution. Verify that the selected part's electrical specifications (clamping voltage, current rating, power dissipation) meet circuit protection requirements.

Q: What compliance certifications apply to all substitute parts?

A: All parts (original and substitutes) are RoHS3 compliant and carry MSL 1 (unlimited) moisture sensitivity rating. All are classified as EAR99 for export control and share the same HTSUS code (8541.10.0080). REACH status is unaffected for all parts. These certifications enable direct substitution in regulated manufacturing environments.