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SMBJ45A-13 Equivalent & Substitute Parts
Part Overview
The SMBJ45A-13 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Diodes Incorporated in the SMB (DO-214AA) surface mount package. This component is designed for general-purpose transient voltage suppression applications with a 45V reverse standoff voltage and 72.7V maximum clamping voltage. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active product lines.
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) | 8.3A |
| Power - Peak Pulse | 600W |
| Operating Temperature Range | -55°C ~ 150°C (TJ) |
| Mounting Type | Surface Mount |
| Package / Case | DO-214AA, SMB |
| Type | Zener |
| Unidirectional Channels | 1 |
Substitute Part Grouping Explanation
Substitute parts for the SMBJ45A-13 are classified based on electrical parameter equivalence and package compatibility. The primary substitution criteria are:
- Voltage - Reverse Standoff: 45V (±tolerance)
- Voltage - Clamping (Max) @ Ipp: 72.7V (±tolerance)
- Current - Peak Pulse (10/1000µs): 8.3A (±tolerance)
- Power - Peak Pulse: 600W
- Operating Temperature Range: -55°C to 150°C minimum
- Mounting Type: Surface Mount
- Package / Case: DO-214AA, SMB or equivalent footprint
Substitutes are grouped into two categories: direct package equivalents (SMB/DO-214AA) and alternative package solutions (SOD-128) that meet the electrical specifications.
Parameter Comparison
| Parameter | SMBJ45A-13 (Diodes) | SMBJ45A-13-F (Diodes) | SMBJ45A (MDD) | PTVS43VP1UP,115 (Nexperia) |
|---|---|---|---|---|
| Manufacturer | Diodes Incorporated | Diodes Incorporated | MDD | Nexperia USA Inc. |
| Voltage - Reverse Standoff (Typ) | 45V | 45V | 45V | 43V |
| Voltage - Breakdown (Min) | 50V | 50V | 50V | 47.8V |
| Voltage - Clamping (Max) @ Ipp | 72.7V | 72.7V | 72.7V | 69.4V |
| Current - Peak Pulse (10/1000µs) | 8.3A | 8.3A | 8.3A | 8.6A |
| Power - Peak Pulse | 600W | 600W | 600W | 600W |
| Operating Temperature Range | -55°C ~ 150°C (TJ) | -55°C ~ 150°C (TJ) | -50°C ~ 150°C (TJ) | -55°C ~ 150°C (TA) |
| Package / Case | DO-214AA, SMB | DO-214AA, SMB | DO-214AA, SMB | SOD-128 |
| Product Status | Discontinued | Active | Active | Active |
| RoHS Status | RoHS non-compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
Engineering Selection Recommendations
Direct Package Equivalent (Recommended Primary Substitutes):
SMBJ45A-13-F (Diodes Incorporated) and SMBJ45A (MDD) are direct electrical and mechanical equivalents to the SMBJ45A-13. Both maintain identical voltage and current specifications, identical SMB package footprint, and are available in active product status. SMBJ45A-13-F is supplied in Tape & Reel packaging and carries ROHS3 compliance. SMBJ45A from MDD is available in high inventory volume and also carries ROHS3 compliance. Both support the full operating temperature range of -55°C to 150°C.
Alternative Package Solution:
PTVS43VP1UP,115 (Nexperia USA Inc.) provides electrical substitution with minor parameter variance. The reverse standoff voltage is 43V (versus 45V), clamping voltage is 69.4V (versus 72.7V), and peak pulse current is 8.6A (versus 8.3A). This part uses SOD-128 package, requiring PCB layout modification. The part carries AEC-Q101 automotive qualification and ROHS3 compliance. Selection of this alternative requires verification that the lower standoff voltage and clamping voltage are acceptable for the application circuit.
Frequently Asked Questions (FAQ)
Q: Can SMBJ45A-13-F be used as a direct replacement for SMBJ45A-13?
A: Yes. SMBJ45A-13-F is electrically and mechanically identical to SMBJ45A-13, with identical voltage specifications (45V standoff, 72.7V clamping), current rating (8.3A), and SMB package. The primary difference is product status (active versus discontinued) and packaging format (Tape & Reel).
Q: What are the key differences between SMBJ45A (MDD) and SMBJ45A-13-F?
A: Both parts are electrically identical with matching voltage and current specifications. The differences are manufacturer (MDD versus Diodes Incorporated) and inventory availability. SMBJ45A (MDD) offers significantly higher stock levels.
Q: Is PTVS43VP1UP,115 a suitable substitute?
A: PTVS43VP1UP,115 provides functional transient voltage suppression but with modified electrical parameters: 43V standoff (versus 45V), 69.4V clamping (versus 72.7V), and 8.6A peak pulse current (versus 8.3A). The SOD-128 package requires PCB redesign. This substitute is acceptable only if the application circuit tolerates the lower voltage thresholds.
Q: What is the impact of package change from SMB to SOD-128?
A: Package change requires PCB layout modification, including new footprint design, trace routing, and thermal management considerations. SMB and SOD-128 packages have different physical dimensions and pin configurations, making them incompatible on existing PCB designs without layout revision.
Q: Are all substitute parts RoHS compliant?
A: SMBJ45A-13-F, SMBJ45A (MDD), and PTVS43VP1UP,115 are all ROHS3 compliant. The original SMBJ45A-13 is RoHS non-compliant.
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