SMBJ40E3/TR13 Equivalent & Substitute Parts

Part Overview

The SMBJ40E3/TR13 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Microchip Technology, designed for general-purpose overvoltage protection in surface-mount applications. This component operates with a 40V reverse standoff voltage and provides clamping at 71.4V maximum, with a peak pulse current rating of 8.4A. The device is packaged in DO-214AA (SMB) format and supplied on tape and reel.

The SMBJ40E3/TR13 maintains active product status and full RoHS3 compliance. Equivalent and substitute parts are identified based on matching electrical parameters—specifically reverse standoff voltage, breakdown voltage, clamping voltage, peak pulse current, and power dissipation—combined with compatible surface-mount packaging and operating temperature ranges suitable for the intended application.

Substiute Parts

SMBJ40E3/TR13

Microchip TechnologyIn Stock: 856SMBJ40E3/TR13 Datasheet

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SM6T47AY

STMicroelectronicsIn Stock: 4460SM6T47AY Datasheet

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SMBJ40A

MDDIn Stock: 17458SMBJ40A Datasheet

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SMBJ40A

MDDIn Stock: 17458SMBJ40A Datasheet

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SMBJ40A

MDDIn Stock: 17458SMBJ40A Datasheet

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SMBJ40A-13-F

Diodes IncorporatedIn Stock: 189781SMBJ40A-13-F Datasheet

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SMBJ40A-TP

Micro Commercial CoIn Stock: 8503SMBJ40A-TP Datasheet

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SMBJ40A-TR

STMicroelectronicsIn Stock: 3286SMBJ40A-TR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMBJ40E3/TR13 are grouped based on strict electrical and mechanical compatibility criteria. All substitute candidates must satisfy the following requirements:

Primary Matching Criteria:

• Reverse standoff voltage: 40V (typical)
• Breakdown voltage minimum: 44.4V
• Unidirectional channel configuration: 1 channel
• Package type: DO-214AA / SMB surface mount
• Peak pulse power dissipation: 600W
• RoHS3 compliance and active product status

Secondary Compatibility Factors:

• Clamping voltage at peak pulse current (Ipp): Substitutes may vary within application tolerance
• Peak pulse current rating: Substitutes with equal or higher current capacity are acceptable
• Operating temperature range: Minimum -55°C to maximum 150°C or higher
• Moisture sensitivity level: MSL 1 (unlimited) for all candidates

Substitutes are presented in two functional groups: direct electrical equivalents with minimal parameter variance, and compatible alternatives with enhanced performance characteristics (higher current handling or extended temperature ranges).

Parameter Comparison

Engineering Selection Recommendations

Direct Electrical Equivalents:

The SMBJ40A variants (MDD, Diodes Incorporated, Micro Commercial Co, and STMicroelectronics) provide the closest electrical substitution to the SMBJ40E3/TR13. These parts maintain identical reverse standoff voltage (40V), breakdown voltage (44.4V), and peak pulse power (600W) specifications. Peak pulse current ratings range from 9.3A to 9.7A, representing a marginal increase over the main part's 8.4A specification. Clamping voltage is reduced to 64.5V, which provides tighter voltage regulation during transient events. All variants maintain RoHS3 compliance and MSL 1 moisture sensitivity rating.

The SMBJ40A-TP variant (Micro Commercial Co) offers the extended operating temperature range of -55°C to 175°C, providing additional thermal margin for high-temperature applications compared to the main part's -65°C to 150°C range.

Enhanced Performance Alternative:

The SM6T47AY (STMicroelectronics) represents an enhanced performance substitute with significantly higher peak pulse current capacity (48A at 8/20µs pulse width) while maintaining the same 40V reverse standoff and 44.4V breakdown specifications. This device carries automotive-grade qualification (AEC-Q101) and operates across -55°C to 150°C. The higher clamping voltage of 84V and increased current handling make this part suitable for applications requiring greater transient energy absorption. This substitute is appropriate when the application demands enhanced surge protection capability.

Compliance and Availability:

All substitute parts maintain active product status, RoHS3 compliance, and REACH unaffected designation. Inventory availability ranges from 3,200 to 189,737 units across suppliers, ensuring procurement flexibility.

Frequently Asked Questions (FAQ)

Q: Can the SMBJ40A variants directly replace the SMBJ40E3/TR13 without circuit modification?

A: Yes. The SMBJ40A variants (from MDD, Diodes Incorporated, Micro Commercial Co, and STMicroelectronics) are direct electrical substitutes. They maintain identical reverse standoff voltage (40V), breakdown voltage (44.4V), and peak pulse power (600W). The marginal increase in peak pulse current (9.3A to 9.7A versus 8.4A) and reduction in clamping voltage (64.5V versus 71.4V) represent improved performance characteristics without requiring circuit redesign.

Q: What is the difference between the SM6T47AY and the SMBJ40A variants?

A: The SM6T47AY provides enhanced transient protection with 48A peak pulse current capacity compared to 9.3–9.7A for SMBJ40A variants. The SM6T47AY carries automotive-grade qualification (AEC-Q101) and is suitable for applications requiring higher energy absorption during surge events. Both maintain the same 40V reverse standoff voltage and 600W peak pulse power. The SM6T47AY's higher clamping voltage (84V) may be a consideration in voltage-sensitive applications.

Q: Are all substitute parts available in the same packaging format as the SMBJ40E3/TR13?

A: All substitute parts use DO-214AA (SMB) surface-mount packaging. However, packaging configurations differ: the main part is supplied on tape and reel (TR). Substitute parts are available in multiple packaging options including cut tape (CT), digi-reel, and tape and reel formats. Verify the specific packaging code (e.g., -TR, -TP, -13-F) when ordering to ensure compatibility with assembly equipment.

Q: What is the operating temperature range difference between substitutes?

A: The main part operates from -65°C to 150°C. Most substitutes operate from -55°C to 150°C, representing a 10°C reduction in low-temperature capability. The SMBJ40A-TP variant extends the upper limit to 175°C, providing 25°C additional high-temperature margin. Select the SMBJ40A-TP for applications requiring extended thermal performance.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed maintain RoHS3 compliance and REACH unaffected status, matching the regulatory compliance profile of the SMBJ40E3/TR13.

Q: Which substitute offers the best availability?

A: The SMBJ40A-13-F (Diodes Incorporated) offers the highest inventory availability at 189,737 units. The SMBJ40A from MDD provides 17,400 units. Both represent strong procurement options for volume requirements.

Q: Can the SM6T47AY be used in applications where the SMBJ40E3/TR13 is specified?

A: The SM6T47AY is electrically compatible at the 40V reverse standoff level but provides enhanced performance characteristics. The higher peak pulse current (48A) and clamping voltage (84V) make it suitable for applications requiring greater transient protection. Verify that the application circuit can tolerate the higher clamping voltage before substitution.