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SMBJ45-E3/52 Equivalent & Substitute Parts
Part Overview
The SMBJ45-E3/52 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 45V reverse standoff voltage, 80.3V maximum clamping voltage, and 7.5A peak pulse current capability in a DO-214AA (SMB) package. The part is currently listed as obsolete, making equivalent substitutes necessary for ongoing design support and procurement.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 45 | V |
| Voltage - Breakdown (Min) | 50 | V |
| Voltage - Clamping (Max) @ Ipp | 80.3 | V |
| Current - Peak Pulse (10/1000µs) | 7.5 | A |
| Power - Peak Pulse | 600 | W |
| Operating Temperature Range | -55 to 150 | °C (TJ) |
| Package / Case | DO-214AA, SMB | — |
| Mounting Type | Surface Mount | — |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitution of the SMBJ45-E3/52 is determined by the following critical electrical and mechanical parameters:
- Voltage Rating: Reverse standoff voltage of 45V and breakdown voltage minimum of 50V must be maintained
- Clamping Voltage: Maximum clamping voltage at peak pulse current determines transient suppression effectiveness
- Peak Pulse Current: Minimum 7.5A capability required for equivalent protection
- Package Compatibility: DO-214AA (SMB) surface-mount package mandatory for PCB layout compatibility
- Temperature Range: Operating temperature capability from -55°C to 150°C (or extended range -65°C to 150°C)
- Compliance: RoHS3 compliance preferred for regulatory alignment with the original part
Substitute parts are grouped into two categories based on clamping voltage characteristics:
Group A (80.3V Clamping): Parts matching the original clamping voltage specification
- SMBJ45E3/TR13 (Microchip Technology)
Group B (72.7V Clamping): Parts with lower clamping voltage but equivalent standoff and breakdown ratings
- SMBJ45A-E3/52 (Vishay)
- 1SMB45A TR13 (Central Semiconductor Corp)
- SMBJ45A (MDD)
- SMBJ45A-13-F (Diodes Incorporated)
- SMBJ45A-HR (Littelfuse Inc.)
- SMBJ45A-HRA (Littelfuse)
Group C (77V Clamping): Alternative with different peak pulse current
- SACB45 (Littelfuse Inc.)
Parameter Comparison
| Part Number | Manufacturer | Voltage - Reverse Standoff (V) | Voltage - Breakdown Min (V) | Voltage - Clamping Max @ Ipp (V) | Current - Peak Pulse (A) | Power - Peak Pulse (W) | Operating Temp (°C) | Package | RoHS Status | Product Status |
|---|---|---|---|---|---|---|---|---|---|---|
| SMBJ45-E3/52 | Vishay | 45 | 50 | 80.3 | 7.5 | 600 | -55 to 150 | DO-214AA (SMB) | ROHS3 | Obsolete |
| SMBJ45A-E3/52 | Vishay | 45 | 50 | 72.7 | 8.3 | 600 | -55 to 150 | DO-214AA (SMB) | ROHS3 | Active |
| SMBJ45E3/TR13 | Microchip Technology | 45 | 50 | 80.3 | 7.5 | 600 | -65 to 150 | DO-214AA (SMB) | ROHS3 | Active |
| 1SMB45A TR13 | Central Semiconductor Corp | 45 | 50 | 72.7 | 8.3 | 600 | -65 to 150 | DO-214AA (SMB) | Non-compliant | Active |
| SACB45 | Littelfuse Inc. | 45 | 50 | 77 | 6.8 | 500 | -55 to 150 | DO-214AA (SMB) | ROHS3 | Active |
| SMBJ45A | MDD | 45 | 50 | 72.7 | 8.3 | 600 | -50 to 150 | DO-214AA (SMB) | ROHS3 | Active |
| SMBJ45A-13-F | Diodes Incorporated | 45 | 50 | 72.7 | 8.3 | 600 | -55 to 150 | DO-214AA (SMB) | ROHS3 | Active |
| SMBJ45A-HR | Littelfuse Inc. | 45 | 50 | 72.7 | 8.3 | 600 | -65 to 150 | DO-214AA (SMB) | ROHS3 | Active |
| SMBJ45A-HRA | Littelfuse | 45 | 50 | 72.7 | 8.3 | 600 | -65 to 150 | DO-214AA (SMB) | ROHS3 | Active |
Engineering Selection Recommendations
Primary Substitute (Exact Electrical Match): SMBJ45E3/TR13 (Microchip Technology) provides identical clamping voltage (80.3V) and peak pulse current (7.5A) specifications. This part is active in production status and ROHS3 compliant. Extended operating temperature range (-65°C to 150°C) provides additional thermal margin compared to the original part.
Secondary Substitutes (Functional Equivalents): SMBJ45A-E3/52 (Vishay), SMBJ45A-13-F (Diodes Incorporated), SMBJ45A-HR (Littelfuse Inc.), and SMBJ45A-HRA (Littelfuse) are all active, ROHS3-compliant alternatives with 72.7V clamping voltage and 8.3A peak pulse current. These parts maintain the 45V standoff and 50V breakdown specifications while offering improved current handling capability. All are available in DO-214AA (SMB) package.
Alternative Consideration: SACB45 (Littelfuse Inc., SACB series) is ROHS3 compliant and active but features reduced peak pulse current (6.8A) and lower peak pulse power (500W). This part is suitable only if application requirements permit lower current ratings.
Not Recommended: 1SMB45A TR13 (Central Semiconductor Corp) is not RoHS3 compliant, which may conflict with regulatory requirements for new designs.
Frequently Asked Questions (FAQ)
Q: Can SMBJ45A-E3/52 directly replace SMBJ45-E3/52 in existing designs? A: Yes. Both parts maintain identical voltage ratings (45V standoff, 50V breakdown) and operate within the same temperature range (-55°C to 150°C). The SMBJ45A-E3/52 offers improved peak pulse current (8.3A vs 7.5A) and is actively produced by Vishay.
Q: What is the difference between 80.3V and 72.7V clamping voltage? A: Clamping voltage determines the maximum voltage spike suppressed at the specified peak pulse current. The 80.3V specification (SMBJ45-E3/52, SMBJ45E3/TR13) provides tighter voltage control. The 72.7V specification (SMBJ45A variants) is acceptable for applications where the lower clamping voltage meets circuit protection requirements.
Q: Are all substitute parts available in the same DO-214AA (SMB) package? A: Yes. All listed substitutes use the DO-214AA (SMB) surface-mount package, ensuring PCB layout compatibility without redesign.
Q: Why is SMBJ45E3/TR13 (Microchip) preferred over SMBJ45A variants? A: SMBJ45E3/TR13 matches the original part's electrical specifications exactly (80.3V clamping, 7.5A peak pulse) while maintaining active production status and ROHS3 compliance. It also provides extended temperature range (-65°C to 150°C).
Q: Does the MDD SMBJ45A have any temperature limitations? A: The MDD SMBJ45A operates from -50°C to 150°C, which is a narrower range than the original part (-55°C to 150°C). Verify this range is acceptable for your application's minimum operating temperature requirement.
Q: Is RoHS3 compliance mandatory for substitution? A: RoHS3 compliance is required for designs subject to EU Directive 2011/65/EU or equivalent regulations. The 1SMB45A TR13 is not RoHS3 compliant and should not be used in regulated applications.
Q: Can SACB45 be used as a substitute? A: SACB45 is functionally compatible for voltage protection but has reduced peak pulse current (6.8A vs 7.5A) and lower peak pulse power (500W vs 600W). Use only if your circuit's transient energy requirements are within these lower limits.
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