SMAJ28A-M3/61 Equivalent & Substitute Parts

Part Overview

The SMAJ28A-M3/61 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates in the 28V reverse standoff voltage class and is designed for general-purpose transient protection applications. The part is active in production status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Equivalent and substitute parts are identified based on matching electrical performance parameters and mechanical compatibility within the DO-214AC (SMA) package form factor.

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)	8.8	A
Power - Peak Pulse	400	W
Operating Temperature Range	-55 to 150	°C (TJ)
Package / Case	DO-214AC, SMA	-
Mounting Type	Surface Mount	-
RoHS Status	ROHS3 Compliant	-
MSL Rating	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitute parts for the SMAJ28A-M3/61 are classified based on strict electrical and mechanical compatibility criteria:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 28V
Voltage - Breakdown (Min): 31.1V
Voltage - Clamping (Max) @ Ipp: 45.4V
Current - Peak Pulse (10/1000µs): 8.8A
Power - Peak Pulse: 400W
Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant
MSL Rating: 1 (Unlimited)

Direct Equivalents maintain all electrical parameters and packaging specifications. These parts are interchangeable without circuit redesign.

Functional Equivalents maintain the core voltage and current ratings but may differ in secondary parameters such as clamping voltage tolerance, temperature range, or peak pulse measurement conditions. These require verification of application-specific requirements.

Higher-Performance Alternatives exceed the minimum electrical specifications (higher clamping voltage, higher peak pulse current, or higher power dissipation) and are suitable for applications requiring enhanced transient protection margins.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vwm (Typ) V	Vbr (Min) V	Vc (Max) @ Ipp V	Ipp (10/1000µs) A	Ppk W	Temp Range °C	Package	RoHS
SMAJ28A-M3/61	Vishay General Semiconductor	28	31.1	45.4	8.8	400	-55 to 150	DO-214AC, SMA	ROHS3
SMAJ28A-E3/5A	Vishay General Semiconductor	28	31.1	45.4	8.8	400	-55 to 150	DO-214AC, SMA	ROHS3
SMAJ28A-E3/61	Vishay General Semiconductor	28	31.1	45.4	8.8	400	-55 to 150	DO-214AC, SMA	ROHS3
SMAJ28A	MDD	28	31.1	45.4	8.8	400	-50 to 150	DO-214AC, SMA	ROHS3
SMAJ28A-13-F	Diodes Incorporated	28	31.1	45.4	8.8	400	-55 to 150	DO-214AC, SMA	ROHS3
SMAJ28A-TP	Micro Commercial Co	28	31.1	45.4	8.8	400	-55 to 175	DO-214AC, SMA	ROHS3
SZ1SMA28AT3G	Littelfuse Inc.	28	31.1	45.4	8.8	400	-65 to 150	DO-214AC, SMA	ROHS3
SM4T33AY	STMicroelectronics	28	31.1	59	39 (8/20µs)	400	-55 to 150	DO-214AC, SMA	ROHS3
SMA6J28A-TR	STMicroelectronics	28	31.1	51.6	68 (8/20µs)	600	-55 to 175	DO-214AC, SMA	ROHS3
SMAJ28A-TR	STMicroelectronics	28	31.1	59	39 (8/20µs)	400	-55 to 150	DO-214AC, SMA	ROHS3

Engineering Selection Recommendations

Direct Equivalents (Interchangeable): SMAJ28A-E3/5A, SMAJ28A-E3/61, SMAJ28A-13-F, and SMAJ28A-TP are direct electrical and mechanical equivalents to SMAJ28A-M3/61. All maintain identical voltage ratings, peak pulse current, and power dissipation specifications. These parts are produced by Vishay, Diodes Incorporated, and Micro Commercial Co respectively, all with active product status and ROHS3 compliance. Selection among these equivalents is based on packaging format (Tape & Reel vs. Cut Tape) and inventory availability.

Functional Equivalents with Extended Temperature Range: SZ1SMA28AT3G (Littelfuse) and SMAJ28A-TP (Micro Commercial Co) offer extended operating temperature ranges (-65°C to 150°C and -55°C to 175°C respectively) compared to the base specification (-55°C to 150°C). These are suitable for applications requiring enhanced thermal performance. SZ1SMA28AT3G carries AEC-Q101 automotive qualification.

Higher-Performance Alternatives: SM4T33AY and SMA6J28A-TR (both STMicroelectronics) provide enhanced transient protection with higher clamping voltages (59V and 51.6V respectively) and significantly higher peak pulse currents (39A and 68A respectively). SMA6J28A-TR additionally offers 600W peak pulse power versus 400W. These parts are suitable for applications requiring greater transient suppression margin. Both carry AEC-Q101 automotive qualification and extended temperature ranges.

Compliance and Certification: All listed parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating. Parts designated with AEC-Q101 qualification (SZ1SMA28AT3G, SM4T33AY, SMA6J28A-TR) are suitable for automotive applications.

Frequently Asked Questions (FAQ)

Q: Can SMAJ28A-E3/61 be used as a direct replacement for SMAJ28A-M3/61? A: Yes. Both parts are manufactured by Vishay General Semiconductor and maintain identical electrical specifications: 28V reverse standoff voltage, 31.1V minimum breakdown voltage, 45.4V maximum clamping voltage, 8.8A peak pulse current, and 400W peak pulse power. Both are packaged in DO-214AC (SMA) and comply with ROHS3. The difference is in packaging format and inventory source.

Q: What is the difference between SMAJ28A-TP and SMAJ28A-M3/61? A: SMAJ28A-TP is manufactured by Micro Commercial Co and offers an extended operating temperature range of -55°C to 175°C compared to SMAJ28A-M3/61 at -55°C to 150°C. All electrical parameters remain identical. This makes SMAJ28A-TP suitable for higher-temperature applications.

Q: When should SM4T33AY or SMA6J28A-TR be selected instead of SMAJ28A-M3/61? A: These STMicroelectronics parts provide higher clamping voltages and peak pulse currents. SM4T33AY offers 59V clamping and 39A peak pulse current. SMA6J28A-TR offers 51.6V clamping and 68A peak pulse current with 600W power dissipation. Select these when the application requires enhanced transient suppression beyond the 45.4V / 8.8A specification of SMAJ28A-M3/61.

Q: Are all substitute parts available in the same packaging format? A: All substitute parts are packaged in DO-214AC (SMA) surface mount format. However, packaging options differ: some are supplied in Tape & Reel (TR), others in Cut Tape (CT) & Digi-Reel®. Verify the specific packaging format required for your assembly process.

Q: Which substitute parts carry automotive qualification? A: SZ1SMA28AT3G (Littelfuse), SM4T33AY (STMicroelectronics), and SMA6J28A-TR (STMicroelectronics) carry AEC-Q101 automotive qualification. These are suitable for automotive and mission-critical applications.

Q: What is the significance of the different peak pulse measurement conditions (10/1000µs vs. 8/20µs)? A: The measurement condition indicates the pulse waveform used to characterize peak pulse current. 10/1000µs represents a 10µs rise time and 1000µs pulse width, while 8/20µs represents an 8µs rise time and 20µs pulse width. These different conditions may result in different peak current ratings for the same device. Verify that the measurement condition matches your application's transient profile.

Q: Can SMAJ28A be used as a substitute? A: SMAJ28A (MDD manufacturer) maintains identical electrical specifications but has a slightly reduced operating temperature range of -50°C to 150°C compared to SMAJ28A-M3/61 at -55°C to 150°C. It is suitable for applications not requiring the full -55°C lower temperature limit.

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