SMAJ45AE3/TR13 Equivalent & Substitute Parts

Part Overview

The SMAJ45AE3/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 45V reverse standoff voltage and provides clamping at 72.7V maximum, with a peak pulse current rating of 6.9A. The device is packaged in DO-214AC (SMA) format on tape and reel for automated assembly.

The SMAJ45AE3/TR13 maintains active product status with full RoHS3 compliance and unlimited moisture sensitivity rating. Equivalent and substitute parts are identified based on matching electrical performance parameters, mechanical compatibility, and regulatory compliance to support component procurement flexibility and supply chain continuity.

Substiute Parts

SMAJ45AE3/TR13

Microchip TechnologyIn Stock: 969SMAJ45AE3/TR13 Datasheet

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SMAJ45A

MeritekIn Stock: 300376SMAJ45A Datasheet

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SMAJ45A

MeritekIn Stock: 300376SMAJ45A Datasheet

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SMAJ45A-13-F

Diodes IncorporatedIn Stock: 15348SMAJ45A-13-F Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMAJ45AE3/TR13 are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

• Voltage - Reverse Standoff (Typ): 45V
• Voltage - Clamping (Max) @ Ipp: 72.7V
• Voltage - Breakdown (Min): 50V
• Package / Case: DO-214AC (SMA)
• Mounting Type: Surface Mount
• Type: Zener (Unidirectional)
• Unidirectional Channels: 1

Allowable Variation Parameters:

• Current - Peak Pulse (10/1000µs): Substitute parts rated at 5.5A are acceptable where system design permits operation within reduced peak pulse current specifications
• Power - Peak Pulse: Substitute parts rated at 400W are acceptable where system design permits operation within reduced peak pulse power specifications
• Operating Temperature Range: Substitute parts with -55°C minimum are acceptable where system design does not require -65°C operation

All substitute parts maintain RoHS3 compliance, REACH unaffected status, and unlimited moisture sensitivity rating (MSL 1), ensuring regulatory and environmental compatibility with the original component.

Parameter Comparison

Engineering Selection Recommendations

SMAJ45A (Meritek): This substitute maintains identical voltage specifications (45V standoff, 50V breakdown, 72.7V clamping) and package compatibility. The reduced peak pulse current (5.5A versus 6.9A) and power rating (400W versus 500W) require verification that system transient energy does not exceed the substitute's dissipation capability. Operating temperature minimum of -55°C is acceptable for applications not requiring -65°C operation. Active product status and full RoHS3 compliance support long-term availability and regulatory compliance.

SMAJ45A-13-F (Diodes Incorporated): This substitute provides identical voltage performance and package specifications. Peak pulse current and power ratings match the Meritek alternative (5.5A, 400W), requiring the same thermal and transient energy assessment. Operating temperature range (-55°C to 150°C) aligns with the Meritek option. Active product status, RoHS3 compliance, and established supply inventory (15,300 pcs) support procurement reliability.

Both substitutes are qualified for applications where the reduced peak pulse specifications do not compromise circuit protection requirements. Selection between substitutes should consider supplier availability, lead time, and cost factors within the organization's procurement framework.

Frequently Asked Questions (FAQ)

Q: Can SMAJ45A or SMAJ45A-13-F be used as direct replacements for SMAJ45AE3/TR13?

A: Yes, both parts are direct substitutes for the SMAJ45AE3/TR13 in applications where the reduced peak pulse current (5.5A versus 6.9A) and power dissipation (400W versus 500W) are acceptable. All three parts share identical voltage specifications, package format, and regulatory compliance. System design must confirm that transient energy levels do not exceed the substitute's rated specifications.

Q: What is the difference in peak pulse current between the main part and substitutes?

A: The SMAJ45AE3/TR13 is rated for 6.9A peak pulse current, while both SMAJ45A (Meritek) and SMAJ45A-13-F (Diodes Incorporated) are rated for 5.5A. This 1.4A difference corresponds to a 400W versus 500W power dissipation difference. Applications must ensure that transient surge currents do not exceed 5.5A when using substitute parts.

Q: Are there temperature range differences between these parts?

A: The SMAJ45AE3/TR13 operates from -65°C to 150°C, while both substitutes operate from -55°C to 150°C. The 10°C difference at the lower temperature limit is acceptable for applications not requiring operation below -55°C. High-temperature performance is identical across all three parts.

Q: Do all parts use the same package and mounting method?

A: Yes. All three parts use DO-214AC (SMA) package format and surface-mount technology. They are mechanically and electrically compatible for PCB assembly without design modifications.

Q: Are regulatory and compliance certifications identical?

A: Yes. All three parts are RoHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited) moisture sensitivity rating. No compliance differences exist between the main part and substitutes.

Q: Which substitute should be selected for new designs?

A: Both substitutes are suitable for new designs. Selection should be based on supplier availability, inventory levels, lead time, and cost. The SMAJ45A-13-F (Diodes Incorporated) offers higher inventory availability (15,300 pcs) compared to SMAJ45A (Meritek) at 300,300 pcs. Verify that system transient specifications do not exceed 5.5A peak pulse current before final selection.