SMAJ28CE3/TR13 Equivalent & Substitute Parts

Part Overview

The SMAJ28CE3/TR13 is a transient voltage suppressor (TVS) diode manufactured by Microchip Technology, designed for general-purpose overvoltage protection applications. This bidirectional zener diode operates with a 28V reverse standoff voltage and provides 50V maximum clamping voltage at peak pulse current. The component is housed in a DO-214AC (SMA) surface mount package and is supplied on tape and reel (TR) packaging. The part maintains active product status and is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts are identified based on matching electrical characteristics including reverse standoff voltage, breakdown voltage, clamping voltage, peak pulse current ratings, and compatible surface mount packaging. Substitutes may vary in peak pulse current capacity, clamping voltage, power dissipation, and operating temperature ranges while maintaining the core 28V standoff specification and DO-214AC package form factor.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	28	V
Voltage - Breakdown (Min)	31.1	V
Voltage - Clamping (Max) @ Ipp	50	V
Current - Peak Pulse (10/1000µs)	9.9	A
Power - Peak Pulse	500	W
Operating Temperature Range	-65 to 150	°C (TJ)
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Type	Zener	—
Bidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the SMAJ28CE3/TR13 are grouped based on strict electrical and mechanical compatibility criteria. All substitute parts maintain the following core parameters:

Critical Matching Parameters:

Voltage - Reverse Standoff (Typ): 28V
Voltage - Breakdown (Min): 31.1V
Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount
Type: Zener
Bidirectional Channels: 1
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Variable Parameters (Allowed to Differ):

Voltage - Clamping (Max) @ Ipp: 45.4V to 59V
Current - Peak Pulse (10/1000µs): 8.8A to 68A
Power - Peak Pulse: 400W to 600W
Operating Temperature Range: -65°C to -50°C (minimum) and 150°C to 175°C (maximum)
Manufacturer and packaging configuration (Tape & Reel, Cut Tape, Digi-Reel)

Substitutes are organized into two functional groups: lower-current variants (8.8A peak pulse) with clamping voltages between 45.4V and 51.6V, and higher-current variants (39A to 68A peak pulse) with clamping voltages between 51.6V and 59V. Selection depends on application requirements for transient energy absorption capacity and voltage regulation precision.

Parameter Comparison

Part Number	Manufacturer	Reverse Standoff (V)	Breakdown Min (V)	Clamping Max (V)	Peak Pulse Current	Power Peak Pulse (W)	Temp Range (°C)	Package
SMAJ28CE3/TR13	Microchip Technology	28	31.1	50	9.9A (10/1000µs)	500	-65 to 150	DO-214AC, SMA
SM4T33CAY	STMicroelectronics	28	31.1	59	39A (8/20µs)	400	-55 to 150	DO-214AC, SMA
SMA6J28CA-TR	STMicroelectronics	28	31.1	51.6	68A (8/20µs)	600	-55 to 175	DO-214AC, SMA
SMAJ28CA	MDD	28	31.1	45.4	8.8A (10/1000µs)	400	-50 to 150	DO-214AC, SMA
SMAJ28CA-13-F	Diodes Incorporated	28	31.1	45.4	8.8A (10/1000µs)	400	-55 to 150	DO-214AC, SMA
SMAJ28CA-TP	Micro Commercial Co	28	31.1	45.4	8.8A (10/1000µs)	400	-55 to 175	DO-214AC, SMA
SMAJ28CA-TR	STMicroelectronics	28	31.1	59	39A (8/20µs)	400	-55 to 150	DO-214AC, SMA
SZ1SMA28CAT3G	Littelfuse Inc.	28	31.1	45.4	8.8A (10/1000µs)	400	-65 to 150	DO-214AC, SMA

Engineering Selection Recommendations

Selection of substitute parts for the SMAJ28CE3/TR13 is determined by application-specific transient energy requirements and thermal operating conditions.

For Applications Requiring Matched Peak Pulse Current (9.9A): The SMAJ28CA-13-F (Diodes Incorporated), SMAJ28CA (MDD), SMAJ28CA-TP (Micro Commercial Co), and SZ1SMA28CAT3G (Littelfuse Inc.) provide equivalent peak pulse current ratings of 8.8A, representing a 0.1A reduction from the original specification. These parts are suitable for applications where transient energy absorption capacity is constrained to approximately 400W peak pulse power. The SZ1SMA28CAT3G offers AEC-Q101 automotive qualification and maintains the full -65°C to 150°C operating temperature range of the original part.

For Applications Requiring Higher Transient Energy Absorption: The SMA6J28CA-TR (STMicroelectronics) provides 68A peak pulse current and 600W peak pulse power, representing a 6.8x increase in current handling and 1.2x increase in power dissipation. This part extends the maximum operating temperature to 175°C and is suitable for high-energy transient suppression applications.

For Applications Requiring Higher Clamping Voltage Tolerance: The SM4T33CAY and SMAJ28CA-TR (both STMicroelectronics) provide 59V maximum clamping voltage with 39A peak pulse current and 400W peak pulse power. These parts are suitable for applications where higher voltage regulation margins are acceptable.

Compliance Considerations: All substitute parts maintain RoHS3 compliance and MSL 1 (unlimited) moisture sensitivity rating. The SZ1SMA28CAT3G and SM4T33CAY carry AEC-Q101 automotive qualification, suitable for automotive and industrial applications requiring formal qualification documentation.

Frequently Asked Questions (FAQ)

Q: Can SMAJ28CA-13-F replace SMAJ28CE3/TR13 in all applications?

A: SMAJ28CA-13-F is electrically compatible with SMAJ28CE3/TR13 for applications where peak pulse current requirements do not exceed 8.8A. Both parts share identical reverse standoff voltage (28V), breakdown voltage (31.1V), and DO-214AC package specifications. The primary difference is clamping voltage (45.4V versus 50V) and peak pulse power (400W versus 500W). Applications requiring the full 500W peak pulse power or 50V clamping voltage specification require evaluation of the substitute's 400W and 45.4V ratings.

Q: What is the difference between the 10/1000µs and 8/20µs pulse specifications?

A: The pulse specification indicates the test waveform used to measure peak pulse current. The 10/1000µs waveform (used by Microchip SMAJ28CE3/TR13, MDD SMAJ28CA, Diodes SMAJ28CA-13-F, Micro Commercial SMAJ28CA-TP, and Littelfuse SZ1SMA28CAT3G) represents a slower transient event. The 8/20µs waveform (used by STMicroelectronics SM4T33CAY, SMA6J28CA-TR, and SMAJ28CA-TR) represents a faster transient event. Both waveforms are industry-standard test conditions; selection depends on the actual transient profile in the application.

Q: Is SMA6J28CA-TR suitable as a direct replacement for SMAJ28CE3/TR13?

A: SMA6J28CA-TR is mechanically and electrically compatible in terms of reverse standoff voltage (28V), breakdown voltage (31.1V), and DO-214AC package. However, it provides significantly higher peak pulse current (68A versus 9.9A) and peak pulse power (600W versus 500W). This part is suitable for applications requiring higher transient energy absorption. The higher current rating does not create compatibility issues in standard applications; it provides additional margin for transient suppression.

Q: Which substitute part maintains the widest operating temperature range?

A: The SZ1SMA28CAT3G (Littelfuse Inc.) maintains the identical -65°C to 150°C operating temperature range as the original SMAJ28CE3/TR13. The SMAJ28CA-TP (Micro Commercial Co) and SMA6J28CA-TR (STMicroelectronics) extend the maximum temperature to 175°C. Most other substitutes operate from -55°C minimum temperature.

Q: Are all substitute parts available in tape and reel packaging?

A: The SMAJ28CE3/TR13 is supplied in tape and reel (TR) packaging. Substitute parts are available in various packaging configurations: SMAJ28CA-13-F, SMAJ28CA-TP, SMAJ28CA-TR, and SZ1SMA28CAT3G are supplied in tape and reel. SM4T33CAY and SMA6J28CA-TR are supplied in cut tape (CT) and Digi-Reel® packaging. The MDD SMAJ28CA does not specify packaging configuration. Packaging selection depends on assembly process requirements.

Q: Do any substitute parts carry automotive qualification?

A: The SM4T33CAY (STMicroelectronics) and SZ1SMA28CAT3G (Littelfuse Inc.) carry AEC-Q101 automotive qualification. These parts are suitable for automotive and industrial applications requiring formal qualification documentation. The SZ1SMA28CAT3G additionally maintains the full -65°C to 150°C operating temperature range of the original part.

Q: What is the impact of selecting a substitute with lower clamping voltage?

A: Substitutes with lower clamping voltage (45.4V versus 50V) provide tighter voltage regulation during transient suppression events. The lower clamping voltage reduces the maximum voltage spike seen by protected circuitry. This is generally beneficial for sensitive components. Selection of lower clamping voltage substitutes is appropriate when the application can tolerate reduced peak pulse power (400W versus 500W) and peak pulse current (8.8A versus 9.9A).

Q: What is the impact of selecting a substitute with higher clamping voltage?

A: Substitutes with higher clamping voltage (59V versus 50V) allow higher voltage spikes during transient suppression. This is appropriate for applications where the protected circuitry has higher voltage tolerance and where higher transient energy absorption capacity is required. The higher clamping voltage variants (SM4T33CAY and SMAJ28CA-TR) provide 39A peak pulse current, representing a 3.9x increase in current handling capacity.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message