SMBJ28AE3/TR13 Equivalent & Substitute Parts

Part Overview

The SMBJ28AE3/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 28V reverse standoff voltage and provides 45.4V maximum clamping voltage at peak pulse current of 13.2A. The part is classified as Active status and is RoHS3 compliant with unlimited moisture sensitivity rating (MSL 1).

Equivalent and substitute parts are identified based on matching electrical characteristics (voltage ratings, clamping specifications, peak pulse current) and mechanical compatibility (DO-214AA/SMB package, surface-mount configuration). Substitutes maintain the same functional performance envelope while potentially offering different packaging formats or manufacturer sources.

Substiute Parts

SMBJ28AE3/TR13

Microchip TechnologyIn Stock: 1032SMBJ28AE3/TR13 Datasheet

Current PartRFQ

SMBJ28A

MDDIn Stock: 86400SMBJ28A Datasheet

DirectRFQ

SMBJ28A

MDDIn Stock: 86400SMBJ28A Datasheet

DirectRFQ

SMBJ28A

MDDIn Stock: 86400SMBJ28A Datasheet

DirectRFQ

SMBJ28A-13-F

Diodes IncorporatedIn Stock: 20113SMBJ28A-13-F Datasheet

DirectRFQ

SMBJ28A-TP

Micro Commercial CoIn Stock: 30424SMBJ28A-TP Datasheet

DirectRFQ

SMBJ28A-TR

STMicroelectronicsIn Stock: 12726SMBJ28A-TR Datasheet

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SZ1SMB28AT3G

Littelfuse Inc.In Stock: 144063SZ1SMB28AT3G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMBJ28AE3/TR13 are classified based on electrical parameter equivalence and mechanical compatibility. The substitution logic is determined by the following criteria:

Primary Matching Parameters:

• Voltage - Reverse Standoff: 28V (±tolerance)
• Voltage - Clamping (Max) @ Ipp: 45.4V
• Current - Peak Pulse (10/1000µs): 13.2A to 13.8A range
• Power - Peak Pulse: 600W
• Package / Case: DO-214AA or SMB designation
• Mounting Type: Surface Mount
• Unidirectional Channels: 1

Secondary Compatibility Factors:

• Product Status: Active
• RoHS Compliance: ROHS3 Compliant
• Moisture Sensitivity Level: MSL 1 (Unlimited)
• REACH Status: REACH Unaffected

Parts meeting all primary matching parameters are classified as direct equivalents. Variations in peak pulse current within the 13.2A to 13.8A range, operating temperature range extensions, and packaging format differences (Tape & Reel vs. Cut Tape) do not disqualify substitution eligibility when electrical specifications remain within the defined envelope.

Parameter Comparison

Engineering Selection Recommendations

All identified substitute parts maintain Active product status and full RoHS3 compliance, ensuring regulatory alignment with the original SMBJ28AE3/TR13 specification. Selection among equivalent parts is determined by application-specific requirements:

SMBJ28A (MDD): Suitable for applications with operating temperature ceiling of 150°C. Offers highest inventory availability (86,300 units). Peak pulse current specification of 13.3A provides marginal headroom above the primary part.

SMBJ28A-13-F (Diodes Incorporated): Specified for -55°C minimum operating temperature, providing 10°C improvement over the primary part in cold environments. Available in Cut Tape & Digi-Reel® packaging format. Peak pulse current matches primary specification at 13.2A.

SMBJ28A-TP (Micro Commercial Co): Extends operating temperature range to 175°C maximum, offering 25°C improvement over primary part in high-temperature applications. Tape & Reel packaging matches original format. Peak pulse current at 13.2A.

SMBJ28A-TR (STMicroelectronics): Specified with highest peak pulse current at 13.8A, providing maximum transient protection margin. TRANSIL™ series designation. Operating temperature range -55 to 150°C. Cut Tape & Digi-Reel® packaging.

SZ1SMB28AT3G (Littelfuse Inc.): Automotive-grade component with AEC-Q101 qualification. Specified capacitance of 590pF @ 1MHz. Operating temperature range matches primary part (-65 to 150°C). Highest inventory availability (143,959 units). Tape & Reel packaging.

Frequently Asked Questions (FAQ)

Q: Can SMBJ28A (MDD) be used as a direct replacement for SMBJ28AE3/TR13?

A: Yes. Both parts share identical voltage ratings (28V standoff, 31.1V breakdown minimum, 45.4V clamping maximum), equivalent peak pulse current (13.3A vs. 13.2A), and matching 600W peak pulse power rating. Both are surface-mount DO-214AA/SMB packages with RoHS3 compliance and MSL 1 rating. The primary difference is operating temperature range (-50 to 150°C for MDD vs. -65 to 150°C for Microchip), which does not affect substitution in applications operating within the MDD temperature envelope.

Q: What is the significance of peak pulse current variation (13.2A to 13.8A) among substitute parts?

A: Peak pulse current specification defines the maximum transient current the TVS diode can safely conduct during a 10/1000µs pulse event. All substitute parts fall within a 0.6A range (13.2A to 13.8A), representing less than 5% variation. This range is within typical manufacturing tolerance for this component class and does not affect functional substitution. Parts with higher peak pulse current (13.8A) provide additional transient protection margin.

Q: Are packaging format differences (Tape & Reel vs. Cut Tape) significant for substitution?

A: Packaging format differences affect supply chain logistics and assembly line compatibility but do not impact electrical performance or circuit functionality. The SMBJ28AE3/TR13 is supplied in Tape & Reel format. Substitute parts available in Cut Tape & Digi-Reel® format (SMBJ28A-13-F, SMBJ28A-TR) are electrically equivalent but require different handling in automated assembly processes. Selection should align with manufacturing equipment capabilities.

Q: Why does SZ1SMB28AT3G include automotive-grade and AEC-Q101 qualification?

A: SZ1SMB28AT3G is manufactured by Littelfuse Inc. with automotive-grade designation and AEC-Q101 qualification, indicating compliance with automotive industry reliability and quality standards. This classification does not affect substitution in general-purpose applications but indicates enhanced qualification testing. The part is suitable for both automotive and general industrial applications.

Q: What is the impact of operating temperature range differences on part selection?

A: Operating temperature range specifies the junction temperature (TJ) limits for reliable operation. The primary part (SMBJ28AE3/TR13) operates from -65°C to 150°C. Substitute SMBJ28A-TP extends the upper limit to 175°C, suitable for high-temperature environments. SMBJ28A (MDD) reduces the lower limit to -50°C, which is acceptable for applications not requiring extreme cold operation. Selection should match the actual operating environment of the application.

Q: Is RoHS3 compliance uniform across all substitute parts?

A: Yes. All identified substitute parts carry RoHS3 Compliant status with REACH Unaffected designation and MSL 1 (Unlimited) moisture sensitivity rating, matching the primary part specification. This ensures regulatory compliance consistency across all substitution options.

Q: Can SMBJ28A-TR (STMicroelectronics) be selected based on higher peak pulse current specification?

A: SMBJ28A-TR is specified at 13.8A peak pulse current, compared to 13.2A for the primary part. This 0.6A difference represents approximately 4.5% higher transient current capacity. Selection based on this parameter is valid when application analysis indicates benefit from additional transient protection margin. However, this does not constitute a requirement for substitution; the primary part specification is sufficient for applications designed to the original SMBJ28AE3/TR13 parameters.