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SMAJ45A-13 Equivalent & Substitute Parts
Part Overview
The SMAJ45A-13 is a 45V Transient Voltage Suppressor (TVS) diode manufactured by Diodes Incorporated, designed for general-purpose overvoltage protection in surface-mount applications. This part is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives that maintain the same electrical performance and mechanical compatibility for ongoing production and repair applications.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Voltage - Reverse Standoff (Typ) | 45V |
| Voltage - Breakdown (Min) | 50V |
| Voltage - Clamping (Max) @ Ipp | 72.7V |
| Current - Peak Pulse (10/1000µs) | 5.5A |
| Power - Peak Pulse | 400W |
| Operating Temperature Range | -55°C ~ 150°C |
| Mounting Type | Surface Mount |
| Package / Case | DO-214AC (SMA) |
| Type | Zener |
| Unidirectional Channels | 1 |
Substitute Part Grouping Explanation
Substitution of the SMAJ45A-13 is determined by strict equivalence across the following electrical and mechanical parameters:
- Voltage - Reverse Standoff (Typ): 45V
- Voltage - Breakdown (Min): 50V
- Voltage - Clamping (Max) @ Ipp: 72.7V
- Current - Peak Pulse (10/1000µs): 5.5A
- Power - Peak Pulse: 400W
- Operating Temperature Range: -55°C ~ 150°C
- Type: Zener, Unidirectional (1 channel)
- Mounting Type: Surface Mount
Substitute parts are grouped into two categories: direct packaging equivalents (same SMA package) and functional equivalents with alternative packages (SOD-123W). All listed substitutes maintain identical electrical specifications and are qualified for the same applications.
Parameter Comparison
| Parameter | SMAJ45A-13 (Diodes) | SMAJ45A-13-F (Diodes) | PTVS45VS1UR,115 (Nexperia) | SMAJ45A (Meritek) |
|---|---|---|---|---|
| Manufacturer | Diodes Incorporated | Diodes Incorporated | Nexperia USA Inc. | Meritek |
| Voltage - Reverse Standoff (Typ) | 45V | 45V | 45V | 45V |
| Voltage - Breakdown (Min) | 50V | 50V | 50V | 50V |
| Voltage - Clamping (Max) @ Ipp | 72.7V | 72.7V | 72.7V | 72.7V |
| Current - Peak Pulse (10/1000µs) | 5.5A | 5.5A | 5.5A | 5.5A |
| Power - Peak Pulse | 400W | 400W | 400W | 400W |
| Operating Temperature | -55°C ~ 150°C (TJ) | -55°C ~ 150°C (TJ) | -55°C ~ 150°C (TA) | -55°C ~ 150°C |
| Package / Case | DO-214AC (SMA) | DO-214AC (SMA) | SOD-123W | DO-214AC (SMA) |
| Type | Zener | Zener | Zener | Zener |
| Unidirectional Channels | 1 | 1 | 1 | 1 |
| Product Status | Discontinued | Active | Active | Active |
| RoHS Status | Non-compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
For applications requiring the SMAJ45A-13, the following selection criteria apply:
Same Package (DO-214AC SMA) Substitutes:
- SMAJ45A-13-F (Diodes Incorporated): Direct equivalent with identical electrical specifications. Active product status and ROHS3 compliance provide supply continuity and regulatory alignment.
- SMAJ45A (Meritek): Functionally equivalent with identical electrical specifications. Active product status and ROHS3 compliance. Highest inventory availability (300,300 pcs).
Alternative Package (SOD-123W) Substitute:
- PTVS45VS1UR,115 (Nexperia USA Inc.): Functionally equivalent with identical electrical specifications. Active product status, ROHS3 compliance, and AEC-Q101 automotive qualification. Package change from SMA to SOD-123W requires PCB layout modification.
All substitutes maintain identical electrical performance and operating temperature ranges. Selection should prioritize active product status and ROHS3 compliance for new designs. Package compatibility with existing PCB layouts determines suitability for direct replacement without redesign.
Frequently Asked Questions (FAQ)
Q: Can SMAJ45A-13-F be used as a direct replacement for SMAJ45A-13? A: Yes. SMAJ45A-13-F is electrically and mechanically identical to SMAJ45A-13, with the same DO-214AC (SMA) package. The primary difference is product status (active vs. discontinued) and RoHS compliance (ROHS3 vs. non-compliant).
Q: What is the difference between SMAJ45A-13 and SMAJ45A? A: Both parts are electrically equivalent with identical voltage, current, and power specifications. The primary difference is the manufacturer: SMAJ45A-13 is from Diodes Incorporated, while SMAJ45A is from Meritek. Both use the same DO-214AC (SMA) package.
Q: Can PTVS45VS1UR,115 replace SMAJ45A-13 without PCB modification? A: PTVS45VS1UR,115 is electrically equivalent but uses a different package (SOD-123W instead of SMA). Direct PCB replacement is not possible without layout modification. This substitute is suitable only for new designs or applications where package change is acceptable.
Q: Are all substitutes RoHS compliant? A: SMAJ45A-13-F, PTVS45VS1UR,115, and SMAJ45A are all ROHS3 compliant. The original SMAJ45A-13 is RoHS non-compliant.
Q: Which substitute has the highest inventory availability? A: SMAJ45A (Meritek) has the highest inventory at 300,300 pcs. PTVS45VS1UR,115 (Nexperia) has 18,660 pcs, and SMAJ45A-13-F (Diodes) has 15,300 pcs.
Q: Is PTVS45VS1UR,115 suitable for automotive applications? A: PTVS45VS1UR,115 carries AEC-Q101 automotive qualification. The other substitutes do not list automotive qualification.
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