SMBJ28A-TP Equivalent & Substitute Parts

Part Overview

The SMBJ28A-TP is a unidirectional transient voltage suppressor (TVS) diode manufactured by Micro Commercial Co, 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. The part is active in production status and RoHS3 compliant, making it suitable for modern electronic designs requiring transient suppression in the 28V protection class.

Equivalent and substitute parts are identified when they maintain identical or functionally compatible electrical parameters within the specified operating range, share the same package footprint (DO-214AA/SMB), and meet equivalent compliance standards.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	28	V
Voltage - Breakdown (Min)	31.1	V
Voltage - Clamping (Max) @ Ipp	45.4	V
Current - Peak Pulse (10/1000µs)	13.2	A
Power - Peak Pulse	600	W
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature Range	-55 to 175	°C (TJ)
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the SMBJ28A-TP are classified based on strict electrical parameter matching within the 28V protection class. The substitution criteria are:

Voltage - Reverse Standoff: 28V (exact match required)
Voltage - Breakdown (Min): 31.1V (exact match required)
Voltage - Clamping (Max) @ Ipp: 45.4V (exact match required)
Current - Peak Pulse (10/1000µs): 13.2A to 13.8A (within tolerance range)
Power - Peak Pulse: 600W (exact match required)
Package / Case: DO-214AA or SMB (footprint compatible)
Mounting Type: Surface Mount (required)
RoHS Status: ROHS3 Compliant (required)

Parts meeting these criteria are classified as direct equivalents or functionally compatible substitutes. Variations in peak pulse current within the 13.2A to 13.8A range do not affect circuit protection performance for general-purpose applications.

Parameter Comparison

Parameter	SMBJ28A-TP (Micro Commercial Co)	SMBJ28A (MDD)	SMBJ28A-13-F (Diodes Incorporated)	SMBJ28A-TR (STMicroelectronics)	SZ1SMB28AT3G (Littelfuse Inc.)
Voltage - Reverse Standoff (Typ)	28V	28V	28V	28V	28V
Voltage - Breakdown (Min)	31.1V	31.1V	31.1V	31.1V	31.1V
Voltage - Clamping (Max) @ Ipp	45.4V	45.4V	45.4V	45.4V	45.4V
Current - Peak Pulse (10/1000µs)	13.2A	13.3A	13.2A	13.8A	13.2A
Power - Peak Pulse	600W	600W	600W	600W	600W
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Operating Temperature Range	-55 to 175°C	-50 to 150°C	-55 to 150°C	-55 to 150°C	-65 to 150°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts maintain electrical equivalence to the SMBJ28A-TP within the specified 28V protection class and are RoHS3 compliant. Selection among these parts should be based on:

SMBJ28A (MDD): Direct electrical equivalent with identical clamping voltage and peak pulse current specifications. Operating temperature range is -50 to 150°C, which is narrower than the main part. Suitable for applications where the reduced upper temperature limit does not conflict with system requirements.

SMBJ28A-13-F (Diodes Incorporated): Direct electrical equivalent with 13.2A peak pulse current matching the main part specification. Operating temperature range is -55 to 150°C. Packaged in Cut Tape (CT) & Digi-Reel format, providing alternative supply chain options.

SMBJ28A-TR (STMicroelectronics): Functionally compatible with 13.8A peak pulse current, within the acceptable tolerance range. Operating temperature range is -55 to 150°C. Supplied in Cut Tape (CT) & Digi-Reel format.

SZ1SMB28AT3G (Littelfuse Inc.): Direct electrical equivalent with 13.2A peak pulse current. Includes automotive-grade qualification (AEC-Q101) and extended lower temperature rating (-65°C minimum). Supplied in Tape & Reel packaging. Suitable for automotive and extended temperature applications.

Frequently Asked Questions (FAQ)

Q: Can SMBJ28A (MDD) be used as a direct replacement for SMBJ28A-TP?

A: Yes. Both parts share identical voltage specifications (28V standoff, 31.1V breakdown, 45.4V clamping) and peak pulse power (600W). The primary difference is the operating temperature range: MDD variant operates -50 to 150°C versus -55 to 175°C for the original. Substitution is valid if the application does not require operation below -50°C or above 150°C.

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

A: Peak pulse current variation within this range does not affect circuit protection performance for general-purpose transient suppression. All listed parts maintain the same 45.4V clamping voltage and 600W peak pulse power, ensuring equivalent overvoltage protection characteristics.

Q: Are all substitute parts compatible with the DO-214AA/SMB footprint?

A: Yes. All substitute parts use the DO-214AA (SMB) package, ensuring mechanical and electrical compatibility with existing PCB designs. No layout modifications are required.

Q: Why is SZ1SMB28AT3G listed as a substitute if it has automotive qualification?

A: SZ1SMB28AT3G meets all electrical and package requirements for substitution. The automotive qualification (AEC-Q101) and extended temperature range (-65 to 150°C) represent additional capabilities that do not prevent its use in non-automotive applications. It is a valid substitute for any application within the specified electrical parameters.

Q: What packaging formats are available among the substitute parts?

A: SMBJ28A (MDD) is available in standard packaging. SMBJ28A-13-F (Diodes Incorporated) and SMBJ28A-TR (STMicroelectronics) are supplied in Cut Tape (CT) & Digi-Reel format. SZ1SMB28AT3G (Littelfuse Inc.) is supplied in Tape & Reel (TR) format. Selection depends on assembly process requirements and supply chain preferences.

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