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SMAJ28CA-13 Equivalent & Substitute Parts
Part Overview
The SMAJ28CA-13 is a transient voltage suppressor (TVS) diode manufactured by Diodes Incorporated, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 28V reverse standoff voltage with a 45.4V maximum clamping voltage and 8.8A peak pulse current capability in a DO-214AC (SMA) package.
The SMAJ28CA-13 carries an obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements.
Substiute Parts
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 | — |
| Bidirectional Channels | 1 | — |
Substitute Part Grouping Explanation
Substitute parts for the SMAJ28CA-13 are grouped based on strict electrical and mechanical compatibility criteria:
Primary Substitution Criteria:
- Voltage - Reverse Standoff (Typ): 28V
- Voltage - Breakdown (Min): 31.1V
- Package / Case: DO-214AC, SMA
- Mounting Type: Surface Mount
- Type: Zener
- Bidirectional Channels: 1
Grouping Logic:
Group 1 - Direct Electrical & Mechanical Equivalents: Parts with identical clamping voltage (45.4V), peak pulse current (8.8A), and power rating (400W). These provide one-to-one functional replacement.
Group 2 - Higher Performance Variants: Parts with identical standoff and breakdown voltages but higher clamping voltage, peak pulse current, or power dissipation. These provide enhanced protection capability while maintaining voltage compatibility.
Parameter Comparison
| Part Number | Manufacturer | Voltage - Reverse Standoff (V) | Voltage - Breakdown (V) | Voltage - Clamping (V) | Current - Peak Pulse (A) | Power - Peak Pulse (W) | Operating Temp (°C) | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|
| SMAJ28CA-13 | Diodes Incorporated | 28 | 31.1 | 45.4 | 8.8 | 400 | -55 to 150 | Obsolete | Non-compliant |
| SMAJ28CA-13-F | Diodes Incorporated | 28 | 31.1 | 45.4 | 8.8 | 400 | -55 to 150 | Active | ROHS3 Compliant |
| TV04A280JB-G | Comchip Technology | 28 | 31.1 | 45.4 | 8.81 | 400 | -55 to 150 | Active | ROHS3 Compliant |
| P4SMAJ28CA_R1_00001 | Panjit International Inc. | 28 | 31.1 | 45.4 | 8.8 | 400 | -55 to 150 | Active | ROHS3 Compliant |
| SM4T33CAY | STMicroelectronics | 28 | 31.1 | 59 | 39 (8/20µs) | 400 | -55 to 150 | Active | ROHS3 Compliant |
| SMA6J28CA-TP | Micro Commercial Co | 28 | 31.1 | 45.4 | 13.2 | 600 | -55 to 175 | Active | Not specified |
| SMA6J28CA-TR | STMicroelectronics | 28 | 31.1 | 51.6 | 68 (8/20µs) | 600 | -55 to 175 | Active | ROHS3 Compliant |
| SMAJ28CA | MDD | 28 | 31.1 | 45.4 | 8.8 | 400 | -50 to 150 | Active | ROHS3 Compliant |
| SMAJ28CA-TP | Micro Commercial Co | 28 | 31.1 | 45.4 | 8.8 | 400 | -55 to 175 | Active | ROHS3 Compliant |
| SMAJ28CA-TR | STMicroelectronics | 28 | 31.1 | 59 | 39 (8/20µs) | 400 | -55 to 150 | Active | ROHS3 Compliant |
Engineering Selection Recommendations
Direct Replacement (Identical Electrical Performance):
SMAJ28CA-13-F, TV04A280JB-G, P4SMAJ28CA_R1_00001, SMAJ28CA, and SMAJ28CA-TP all provide equivalent electrical characteristics to the SMAJ28CA-13 with 28V standoff voltage, 45.4V clamping voltage, and 8.8A peak pulse current. All substitute options carry Active product status and ROHS3 compliance, addressing the obsolescence and regulatory concerns of the original part.
Enhanced Performance Alternatives:
SMA6J28CA-TP and SMA6J28CA-TR offer higher current handling (13.2A and 68A respectively) and increased power dissipation (600W), while maintaining the 28V standoff voltage requirement. These parts accommodate higher transient energy levels within the same voltage protection window.
SM4T33CAY and SMAJ28CA-TR provide 59V clamping voltage with significantly higher peak pulse current (39A at 8/20µs pulse), suitable for applications requiring more aggressive clamping characteristics while preserving the 28V standoff voltage.
Compliance Considerations:
All recommended substitutes carry ROHS3 compliance status, eliminating the non-compliance issue of the obsolete SMAJ28CA-13. Extended operating temperature ranges (-55 to 175°C) are available in SMAJ28CA-TP and SMA6J28CA-TP variants for applications requiring broader thermal performance.
Frequently Asked Questions (FAQ)
Q: Can SMAJ28CA-13-F be used as a direct replacement for SMAJ28CA-13?
A: Yes. SMAJ28CA-13-F matches all critical electrical parameters: 28V reverse standoff voltage, 31.1V minimum breakdown voltage, 45.4V maximum clamping voltage, and 8.8A peak pulse current. The primary difference is product status (Active vs. Obsolete) and RoHS compliance (ROHS3 vs. non-compliant). Packaging and mounting type are identical.
Q: What is the difference between SMAJ28CA-13-F and SMAJ28CA-TP?
A: Both parts share identical electrical specifications (28V standoff, 45.4V clamping, 8.8A peak pulse). SMAJ28CA-TP offers an extended operating temperature range (-55 to 175°C versus -55 to 150°C) and is supplied in Tape & Reel packaging. Selection depends on thermal requirements and packaging preferences.
Q: When should SMA6J28CA-TP or SMA6J28CA-TR be selected instead of direct equivalents?
A: These higher-performance variants maintain the 28V standoff voltage but provide increased current handling and power dissipation. SMA6J28CA-TP delivers 13.2A at 600W, while SMA6J28CA-TR delivers 68A at 600W. Select these when transient energy levels exceed the 8.8A / 400W capability of direct equivalents, provided the 28V voltage protection window remains appropriate.
Q: Are all substitute parts available in the same DO-214AC (SMA) package?
A: Yes. All listed substitute parts use the DO-214AC (SMA) surface-mount package, ensuring mechanical and footprint compatibility with the original SMAJ28CA-13 design.
Q: What is the significance of the 8/20µs pulse specification on some parts?
A: Parts such as SM4T33CAY and SMAJ28CA-TR specify peak pulse current using the 8/20µs waveform standard, which differs from the 10/1000µs specification used for other parts. This represents a different transient pulse profile. Verify pulse waveform compatibility with your application requirements before selection.
Q: Does the choice of manufacturer affect substitution validity?
A: All listed manufacturers (Diodes Incorporated, Comchip Technology, Panjit International Inc., STMicroelectronics, Micro Commercial Co, MDD) produce TVS diodes meeting the specified electrical and mechanical parameters. Selection may be based on supply availability, lead time, or established supplier relationships, provided electrical specifications match application requirements.
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