SMAJ28A-13 Equivalent & Substitute Parts

Part Overview

The SMAJ28A-13 is a transient voltage suppressor (TVS) diode manufactured by Diodes Incorporated in the DO-214AC (SMA) surface mount package. This unidirectional Zener diode is designed for general-purpose transient voltage suppression with a 28V reverse standoff voltage and 45.4V maximum clamping voltage at peak pulse current. The part is currently obsolete, necessitating identification of active equivalent and substitute components that maintain electrical compatibility within specified parameter tolerances.

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
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitute parts for the SMAJ28A-13 are classified into two functional groups based on electrical parameter compatibility:

Group 1: Direct Electrical Equivalents (Identical Clamping Voltage) Parts maintaining the 45.4V maximum clamping voltage specification with 8.8A peak pulse current rating. These components provide direct functional replacement with no circuit redesign required. Includes SMAJ28A-13-F (Diodes Incorporated), SMAJ28A (MDD), TV04A280J-G (Comchip Technology), and SMAJ28A-TP (Micro Commercial Co).

Group 2: Higher Performance Alternatives (Elevated Clamping Voltage) Parts with higher clamping voltage (51.6V to 59V) and increased peak pulse current capability (39A to 68A). These components provide enhanced transient suppression performance but require circuit validation to confirm compatibility with higher clamping voltages. Includes PTVS28VS1UR,115 (Nexperia, SOD-123W package), SM4T33AY (STMicroelectronics, 59V clamping), SMA6J28A-E3/5A (Vishay), SMA6J28A-E3/61 (Vishay), and SMA6J28A-TR (STMicroelectronics).

Substitution eligibility is determined by matching the reverse standoff voltage (28V), breakdown voltage minimum (31.1V), and package compatibility (DO-214AC/SMA or alternative surface mount packages).

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Clamping (Max) @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Package	Product Status	RoHS Status
SMAJ28A-13	Diodes Incorporated	28	45.4	8.8	400	DO-214AC, SMA	Obsolete	Non-compliant
SMAJ28A-13-F	Diodes Incorporated	28	45.4	8.8	400	DO-214AC, SMA	Active	ROHS3 Compliant
SMAJ28A	MDD	28	45.4	8.8	400	DO-214AC, SMA	Active	ROHS3 Compliant
TV04A280J-G	Comchip Technology	28	45.4	8.81	400	DO-214AC, SMA	Active	ROHS3 Compliant
SMAJ28A-TP	Micro Commercial Co	28	45.4	8.8	400	DO-214AC, SMA	Active	ROHS3 Compliant
PTVS28VS1UR,115	Nexperia USA Inc.	28	45.4	8.8	400	SOD-123W	Active	ROHS3 Compliant
SM4T33AY	STMicroelectronics	28	59	39 (8/20µs)	400	DO-214AC, SMA	Active	ROHS3 Compliant
SMA6J28A-E3/5A	Vishay	28	51.6	68 (8/20µs)	4000	DO-214AC, SMA	Active	ROHS3 Compliant
SMA6J28A-E3/61	Vishay	28	51.6	68 (8/20µs)	4000	DO-214AC, SMA	Active	ROHS3 Compliant
SMA6J28A-TR	STMicroelectronics	28	51.6	68 (8/20µs)	600	DO-214AC, SMA	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Group 1 - Identical Electrical Specifications)

SMAJ28A-13-F (Diodes Incorporated) is the primary recommended substitute. It maintains identical electrical parameters (28V standoff, 45.4V clamping, 8.8A peak pulse) and is available in active product status with ROHS3 compliance. This part is a direct form-fit-function replacement requiring no circuit modifications.

SMAJ28A-TP (Micro Commercial Co) provides equivalent electrical performance with extended operating temperature range (-55°C to 175°C) and active product status. Suitable for applications requiring higher temperature operation.

TV04A280J-G (Comchip Technology) and SMAJ28A (MDD) are functionally equivalent alternatives with active status and ROHS3 compliance.

Alternative Package Option (Group 1 - Different Package)

PTVS28VS1UR,115 (Nexperia USA Inc.) maintains identical electrical specifications but uses SOD-123W package instead of DO-214AC/SMA. This part includes AEC-Q101 automotive qualification. Selection requires PCB layout compatibility with SOD-123W footprint.

Higher Performance Alternatives (Group 2 - Enhanced Specifications)

SMA6J28A-TR (STMicroelectronics) and SMA6J28A-E3/5A (Vishay) provide elevated clamping voltage (51.6V) and significantly higher peak pulse current (68A at 8/20µs). These parts maintain DO-214AC/SMA package compatibility and ROHS3 compliance. Selection is appropriate for applications requiring enhanced transient suppression margin.

SM4T33AY (STMicroelectronics) offers the highest clamping voltage (59V) with 39A peak pulse current and AEC-Q101 automotive qualification. Suitable for automotive applications requiring maximum transient protection.

All recommended substitutes are active products with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1).

Frequently Asked Questions (FAQ)

Q: Can SMAJ28A-13-F directly replace SMAJ28A-13 without circuit modification?

A: Yes. SMAJ28A-13-F maintains identical electrical specifications: 28V reverse standoff voltage, 45.4V maximum clamping voltage, and 8.8A peak pulse current. The part is pin-compatible in DO-214AC/SMA package and requires no circuit redesign.

Q: What is the difference between Group 1 and Group 2 substitutes?

A: Group 1 parts (SMAJ28A-13-F, SMAJ28A-TP, TV04A280J-G, SMAJ28A) maintain the 45.4V clamping voltage specification. Group 2 parts (SMA6J28A series, SM4T33AY) feature higher clamping voltages (51.6V to 59V) and increased peak pulse current ratings. Group 2 selection requires circuit validation to confirm compatibility with elevated clamping voltages.

Q: Is PTVS28VS1UR,115 compatible with existing PCB layouts designed for SMAJ28A-13?

A: PTVS28VS1UR,115 maintains identical electrical specifications but uses SOD-123W package instead of DO-214AC/SMA. PCB footprint compatibility must be verified before selection. The part is suitable only if the PCB layout accommodates SOD-123W package dimensions.

Q: Why are some substitutes rated for higher peak pulse current (68A vs 8.8A)?

A: Higher-rated parts (SMA6J28A series) provide enhanced transient suppression capability with greater energy absorption. These parts are suitable for applications requiring additional protection margin but require circuit validation to confirm compatibility with their higher clamping voltages.

Q: Are all recommended substitutes RoHS compliant?

A: Yes. All active substitute parts listed are ROHS3 compliant. The original SMAJ28A-13 is RoHS non-compliant due to obsolete status.

Q: Which substitute offers automotive qualification?

A: PTVS28VS1UR,115 (Nexperia) and SM4T33AY (STMicroelectronics) include AEC-Q101 automotive qualification. These parts are suitable for automotive applications requiring qualified component status.

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