SMBJ45E3/TR13 Equivalent & Substitute Parts

Part Overview

The SMBJ45E3/TR13 is an active-status Transient Voltage Suppressor (TVS) diode manufactured by Microchip Technology. This unidirectional zener-type TVS diode is designed for general-purpose transient voltage suppression in surface-mount applications. The device features a 45V reverse standoff voltage, 80.3V maximum clamping voltage at peak pulse current, and 7.5A peak pulse current capability in a DO-214AA (SMB) package format. The part is supplied in Tape & Reel packaging and maintains full RoHS3 compliance with unlimited moisture sensitivity rating.

Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and design continuity when the primary part becomes unavailable or when alternative sourcing is required.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	45	V
Voltage - Breakdown (Min)	50	V
Voltage - Clamping (Max) @ Ipp	80.3	V
Current - Peak Pulse (10/1000µs)	7.5	A
Power - Peak Pulse	600	W
Operating Temperature Range	-65 to 150	°C (TJ)
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SMBJ45E3/TR13 is determined by strict equivalence across the following critical parameters:

Voltage Parameters: Reverse standoff voltage (45V typical), minimum breakdown voltage (50V), and maximum clamping voltage must remain within acceptable operating margins for the protected circuit. The SMBJ45E3/TR13 specifies 80.3V maximum clamping voltage.

Current Parameters: Peak pulse current capability (10/1000µs waveform) must equal or exceed 7.5A to maintain transient suppression performance.

Power Dissipation: Peak pulse power rating of 600W must be maintained.

Package Compatibility: All substitute parts must use the DO-214AA (SMB) surface-mount package to ensure mechanical and electrical compatibility with existing PCB layouts.

Electrical Type: Unidirectional zener-type TVS diode configuration with single channel.

Compliance: RoHS3 compliance and REACH unaffected status are required for regulatory continuity.

Substitute parts identified in this reference meet these criteria with variations in clamping voltage (72.7V for MDD and Diodes Incorporated variants) and operating temperature ranges, which remain within acceptable substitution parameters for general-purpose applications.

Parameter Comparison

Parameter	SMBJ45E3/TR13 (Microchip)	SMBJ45A (MDD)	SMBJ45A-13-F (Diodes Inc.)
Manufacturer	Microchip Technology	MDD	Diodes Incorporated
Voltage - Reverse Standoff (Typ)	45V	45V	45V
Voltage - Breakdown (Min)	50V	50V	50V
Voltage - Clamping (Max) @ Ipp	80.3V	72.7V	72.7V
Current - Peak Pulse (10/1000µs)	7.5A	8.3A	8.3A
Power - Peak Pulse	600W	600W	600W
Operating Temperature Range	-65°C to 150°C	-50°C to 150°C	-55°C to 150°C
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Type	Zener	—	Zener
Unidirectional Channels	1	1	1
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

SMBJ45A (MDD): This substitute part maintains identical reverse standoff voltage (45V), breakdown voltage (50V), and peak pulse power (600W) specifications. The clamping voltage is reduced to 72.7V with increased peak pulse current capability (8.3A). The operating temperature range is -50°C to 150°C, which is narrower than the primary part. This part is active-status and RoHS3 compliant. Selection is appropriate for applications where the lower clamping voltage and higher current capability provide improved transient suppression performance within the specified temperature range.

SMBJ45A-13-F (Diodes Incorporated): This substitute part is supplied in Tape & Reel packaging, matching the primary part's delivery format. It maintains identical reverse standoff voltage (45V), breakdown voltage (50V), and peak pulse power (600W). The clamping voltage is 72.7V with peak pulse current of 8.3A. The operating temperature range is -55°C to 150°C. This part is active-status, RoHS3 compliant, and carries the SMBJ series designation. Selection is appropriate for applications requiring tape-and-reel packaging with the specified electrical performance.

All substitute parts are active-status products with full RoHS3 compliance and REACH unaffected status, ensuring regulatory continuity and long-term availability.

Frequently Asked Questions (FAQ)

Q: Can SMBJ45A (MDD) be used as a direct replacement for SMBJ45E3/TR13?

A: SMBJ45A meets the critical voltage and power parameters (45V standoff, 50V breakdown, 600W peak pulse power) and uses the same DO-214AA package. The clamping voltage is lower (72.7V vs. 80.3V), and peak pulse current is higher (8.3A vs. 7.5A). Substitution is valid for general-purpose applications where these parameter variations are acceptable. The operating temperature range is narrower (-50°C to 150°C vs. -65°C to 150°C).

Q: What is the difference between SMBJ45A and SMBJ45A-13-F?

A: Both parts share identical electrical specifications (45V standoff, 50V breakdown, 72.7V clamping, 8.3A peak pulse current, 600W power). The primary difference is packaging: SMBJ45A-13-F is supplied in Tape & Reel format, matching the primary part's delivery method. SMBJ45A-13-F also specifies an operating temperature range of -55°C to 150°C compared to SMBJ45A at -50°C to 150°C.

Q: Are all substitute parts compatible with existing PCB layouts designed for SMBJ45E3/TR13?

A: Yes. All substitute parts use the DO-214AA (SMB) surface-mount package, ensuring mechanical and electrical compatibility with PCB layouts designed for the primary part. Pin configuration and footprint requirements are identical.

Q: Do the substitute parts maintain the same compliance certifications?

A: Yes. All substitute parts are RoHS3 compliant and REACH unaffected, matching the primary part's regulatory status. Moisture sensitivity level is 1 (Unlimited) for all parts.

Q: What is the significance of the lower clamping voltage in substitute parts?

A: The substitute parts specify 72.7V maximum clamping voltage compared to 80.3V for the primary part. Lower clamping voltage provides tighter voltage suppression during transient events. This is beneficial in applications where reduced overvoltage stress on protected components is required. The difference must be evaluated against circuit protection requirements.

Q: Can SMBJ45A be ordered in Tape & Reel packaging?

A: The provided data specifies SMBJ45A-13-F as the Tape & Reel variant from Diodes Incorporated. SMBJ45A from MDD does not specify packaging format in the provided parameters. For tape-and-reel delivery, SMBJ45A-13-F is the appropriate selection.

Q: What is the impact of the different operating temperature ranges?

A: SMBJ45E3/TR13 operates from -65°C to 150°C, SMBJ45A from -50°C to 150°C, and SMBJ45A-13-F from -55°C to 150°C. Selection depends on the application's minimum operating temperature requirement. Applications requiring operation below -50°C must use SMBJ45E3/TR13 or SMBJ45A-13-F.

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