SMBJ45A Equivalent & Substitute Parts

Part Overview

The SMBJ45A is a unidirectional transient voltage suppressor (TVS) diode manufactured by Taiwan Semiconductor Corporation, designed for general-purpose overvoltage protection applications. This surface-mount component operates in the 45V reverse standoff voltage class with a 72.7V maximum clamping voltage and 8.3A peak pulse current rating. The device is classified as Active product status and is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts are identified to support design flexibility, supply chain continuity, and manufacturing optimization when the primary SMBJ45A component becomes unavailable or when alternative packaging formats are required.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	45	V
Voltage - Breakdown (Min)	50	V
Voltage - Clamping (Max) @ Ipp	72.7	V
Current - Peak Pulse (10/1000µs)	8.3	A
Power - Peak Pulse	600	W
Operating Temperature Range	-55 to 150	°C (TJ)
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution eligibility for the SMBJ45A is determined by strict electrical and mechanical parameter matching within the transient voltage suppressor category. The following criteria establish substitution validity:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 45V
Voltage - Breakdown (Min): 50V
Package / Case: DO-214AA, SMB
Mounting Type: Surface Mount
Type: Zener
Unidirectional Channels: 1
Operating Temperature Range: -55°C to 150°C (TJ)
RoHS3 Compliance
MSL 1 (Unlimited)

Direct Equivalents maintain identical electrical specifications including voltage clamping (72.7V maximum), peak pulse current (8.3A), and peak pulse power (600W). These parts are interchangeable without circuit redesign.

Similar Substitutes maintain core voltage and package specifications but may exhibit variations in clamping voltage or peak pulse current within the same product class. These parts require application-level verification of performance tolerance.

Parameter Comparison

Parameter	SMBJ45A (Taiwan Semiconductor)	SMBJ45A-13-F (Diodes Inc.)	SMBJ45A-E3/52 (Vishay)	SACB45 (Littelfuse)	SMBJ45A (MDD)
Manufacturer	Taiwan Semiconductor Corporation	Diodes Incorporated	Vishay General Semiconductor	Littelfuse Inc.	MDD
Voltage - Reverse Standoff (Typ)	45V	45V	45V	45V	45V
Voltage - Breakdown (Min)	50V	50V	50V	50V	50V
Voltage - Clamping (Max) @ Ipp	72.7V	72.7V	72.7V	77V	72.7V
Current - Peak Pulse (10/1000µs)	8.3A	8.3A	8.3A	6.8A	8.3A
Power - Peak Pulse	600W	600W	600W	500W	600W
Operating Temperature Range	-55 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C	-50 to 150°C
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Type	Zener	Zener	Zener	Zener	Zener
Unidirectional Channels	1	1	1	1	1
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Packaging Format	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)	Cut Tape (CT)	Tape & Reel (TR)	Not specified

Engineering Selection Recommendations

Direct Equivalent Selection:

The SMBJ45A-13-F (Diodes Incorporated) and SMBJ45A-E3/52 (Vishay General Semiconductor) are direct electrical equivalents to the primary SMBJ45A component. Both maintain identical voltage specifications (45V reverse standoff, 50V breakdown minimum, 72.7V clamping maximum), peak pulse current (8.3A), and power dissipation (600W). Both are Active product status with RoHS3 compliance and MSL 1 rating. These parts are suitable for direct substitution in existing designs without circuit modification.

The SMBJ45A manufactured by MDD is also a direct electrical equivalent with identical electrical parameters. However, this variant specifies an operating temperature range of -50°C to 150°C (TJ), which is narrower than the -55°C to 150°C range of the primary part. Selection of the MDD variant requires confirmation that the application does not require operation below -50°C.

Similar Substitute Selection:

The SACB45 (Littelfuse Inc.) is classified as a similar substitute. This component maintains the 45V reverse standoff voltage and 50V breakdown minimum specifications, and operates within the same temperature range (-55°C to 150°C). However, the SACB45 exhibits a higher clamping voltage (77V maximum versus 72.7V) and lower peak pulse current (6.8A versus 8.3A) and power dissipation (500W versus 600W). The SACB45 is suitable for applications where the higher clamping voltage and reduced current/power ratings are acceptable within the circuit design margins.

All substitute parts listed are Active product status, RoHS3 compliant, and carry MSL 1 (Unlimited) moisture sensitivity classification, ensuring compatibility with standard manufacturing and storage practices.

Frequently Asked Questions (FAQ)

Q: Can SMBJ45A-13-F (Diodes Incorporated) be used as a direct replacement for SMBJ45A (Taiwan Semiconductor Corporation)?

A: Yes. The SMBJ45A-13-F maintains identical electrical specifications including 45V reverse standoff voltage, 50V breakdown minimum, 72.7V clamping voltage, 8.3A peak pulse current, and 600W peak pulse power. Both components are packaged in DO-214AA (SMB) surface-mount format, operate across -55°C to 150°C, and are RoHS3 compliant with MSL 1 rating. The primary difference is packaging format: SMBJ45A-13-F is supplied in Tape & Reel (TR) format while the primary part is available in Cut Tape (CT) and Digi-Reel® formats.

Q: What are the electrical differences between SMBJ45A and SACB45?

A: Both components share the same 45V reverse standoff voltage and 50V breakdown minimum specifications. The key electrical differences are: SACB45 has a maximum clamping voltage of 77V (compared to 72.7V for SMBJ45A), a peak pulse current of 6.8A (compared to 8.3A), and peak pulse power of 500W (compared to 600W). These differences indicate that SACB45 is suitable for applications with higher voltage tolerance and lower current/power requirements.

Q: Is the MDD SMBJ45A suitable for all applications requiring the Taiwan Semiconductor SMBJ45A?

A: The MDD SMBJ45A is electrically equivalent with identical voltage and current specifications. However, the MDD variant specifies an operating temperature range of -50°C to 150°C (TJ), which is narrower than the -55°C to 150°C range of the Taiwan Semiconductor part. Applications requiring operation at temperatures below -50°C must use the Taiwan Semiconductor or other variants with the extended lower temperature specification.

Q: What packaging formats are available for SMBJ45A equivalents?

A: The Taiwan Semiconductor SMBJ45A is available in Cut Tape (CT) and Digi-Reel® formats. The SMBJ45A-13-F (Diodes Incorporated) is supplied in Tape & Reel (TR) format. The SMBJ45A-E3/52 (Vishay) is available in Cut Tape (CT) format. The SACB45 (Littelfuse) is supplied in Tape & Reel (TR) format. Selection of packaging format depends on manufacturing equipment compatibility and volume requirements.

Q: Are all listed substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed—SMBJ45A-13-F, SMBJ45A-E3/52, SACB45, and SMBJ45A (MDD)—are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level, matching the compliance profile of the primary SMBJ45A component.

Q: Can SACB45 be used in high-current transient suppression applications?

A: The SACB45 is rated for 6.8A peak pulse current and 500W peak pulse power, compared to 8.3A and 600W for the SMBJ45A. Applications requiring the full 8.3A peak pulse current specification must use direct equivalents (SMBJ45A-13-F, SMBJ45A-E3/52, or MDD SMBJ45A). The SACB45 is suitable for applications with peak pulse current requirements of 6.8A or lower.

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