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SMBJ18AE3/TR13 Equivalent & Substitute Parts
Part Overview
The SMBJ18AE3/TR13 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Microchip Technology, classified as a Zener-type device in the DO-214AA (SMB) surface mount package. This component is designed for general-purpose transient voltage suppression applications, featuring an 18V reverse standoff voltage and 29.2V maximum clamping voltage at peak pulse current. The part is Active in product status and fully compliant with RoHS3 and REACH regulations. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity for applications requiring identical or functionally compatible TVS diode specifications.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 18 | V |
| Voltage - Breakdown (Min) | 20 | V |
| Voltage - Clamping (Max) @ Ipp | 29.2 | V |
| Current - Peak Pulse (10/1000µs) | 20.5 | A |
| Power - Peak Pulse | 600 | W |
| Operating Temperature Range | -65°C ~ 150°C | TJ |
| Mounting Type | Surface Mount | — |
| Package / Case | DO-214AA, SMB | — |
| Type | Zener | — |
| Unidirectional Channels | 1 | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitute parts for the SMBJ18AE3/TR13 are classified into two categories based on electrical and mechanical compatibility:
Direct Substitutes maintain identical electrical specifications across all critical parameters: 18V reverse standoff voltage, 20V minimum breakdown voltage, 29.2V maximum clamping voltage, and 20.5A peak pulse current at 600W peak pulse power. These parts are interchangeable at the circuit level and differ only in manufacturer, packaging format (Tape & Reel variants), or minor supplier device package designations. Direct substitutes include 1SMB18A TR13 PBFREE (Central Semiconductor Corp), SMBJ18A-13-F (Diodes Incorporated), SMBJ18A-E3/52 (Vishay General Semiconductor), and SMBJ18A-TP (Micro Commercial Co).
Similar Substitutes maintain the same voltage ratings (18V standoff, 20V breakdown, 29.2V clamping) and general functional purpose but exhibit variations in peak pulse current or power dissipation. The SACB18 (Littelfuse Inc.) operates at 15A peak pulse current and 500W peak pulse power, representing a reduced current-handling capability. The SMBJ18A variants from EVVO Semi and STMicroelectronics exhibit peak pulse currents of 20.6A and 21.5A respectively, representing minor deviations within the same functional class. Similar substitutes are suitable for applications where the reduced or slightly elevated current specifications do not conflict with circuit requirements.
Substitution logic is strictly based on the following key parameters: reverse standoff voltage, breakdown voltage, clamping voltage, peak pulse current, peak pulse power, operating temperature range, package type, and regulatory compliance status.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Voltage - Reverse Standoff (V) | Voltage - Breakdown (V) | Voltage - Clamping (V) | Current - Peak Pulse (A) | Power - Peak Pulse (W) | Operating Temperature (°C) | Package / Case | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|
| SMBJ18AE3/TR13 | Microchip Technology | 18 | 20 | 29.2 | 20.5 | 600 | -65 ~ 150 | DO-214AA, SMB | ROHS3 Compliant |
| 1SMB18A TR13 PBFREE | Central Semiconductor Corp | 18 | 20 | 29.2 | 20.5 | 600 | -65 ~ 150 | DO-214AA, SMB | ROHS3 Compliant |
| SMBJ18A-13-F | Diodes Incorporated | 18 | 20 | 29.2 | 20.5 | 600 | -55 ~ 150 | DO-214AA, SMB | ROHS3 Compliant |
| SMBJ18A-E3/52 | Vishay General Semiconductor - Diodes Division | 18 | 20 | 29.2 | 20.5 | 600 | -55 ~ 150 | DO-214AA, SMB | ROHS3 Compliant |
| SMBJ18A-TP | Micro Commercial Co | 18 | 20 | 29.2 | 20.5 | 600 | -55 ~ 175 | DO-214AA, SMB | ROHS3 Compliant |
| SACB18 | Littelfuse Inc. | 18 | 20 | 28.8 | 15 | 500 | -55 ~ 150 | DO-214AA, SMB | ROHS3 Compliant |
| SMBJ18A-TR | STMicroelectronics | 18 | 20 | 29.2 | 21.5 | 600 | -55 ~ 150 | DO-214AA, SMB | ROHS3 Compliant |
Engineering Selection Recommendations
Direct Substitution Candidates:
The 1SMB18A TR13 PBFREE (Central Semiconductor Corp), SMBJ18A-13-F (Diodes Incorporated), SMBJ18A-E3/52 (Vishay General Semiconductor), and SMBJ18A-TP (Micro Commercial Co) are direct electrical equivalents to the SMBJ18AE3/TR13. All four parts maintain identical voltage specifications (18V standoff, 20V breakdown, 29.2V clamping) and peak pulse current (20.5A) at 600W peak pulse power. All are Active in product status and ROHS3 compliant. Selection among these direct substitutes is determined by packaging availability (Tape & Reel or Cut Tape formats), operating temperature range requirements, and manufacturer inventory status.
The SMBJ18A-TP variant from Micro Commercial Co extends the upper operating temperature limit to 175°C, compared to the 150°C maximum of the primary part. This extended temperature range is suitable for applications requiring elevated thermal performance without electrical specification changes.
Similar Substitution Candidates:
The SACB18 (Littelfuse Inc.) operates at reduced peak pulse current (15A versus 20.5A) and reduced peak pulse power (500W versus 600W). This part is suitable for applications where transient energy levels are lower or where current-handling requirements do not exceed 15A. The clamping voltage is marginally lower at 28.8V compared to 29.2V, representing a 0.4V difference within typical application tolerances.
The SMBJ18A-TR (STMicroelectronics) exhibits a peak pulse current of 21.5A, representing a 1A increase over the primary specification. This part maintains all other electrical parameters identically and is suitable for applications requiring slightly elevated current capacity within the same voltage class.
All substitute parts are ROHS3 compliant, possess MSL 1 (Unlimited) moisture sensitivity ratings, and are classified as Active products. Selection should prioritize parts with matching operating temperature ranges and current specifications aligned to circuit requirements.
Frequently Asked Questions (FAQ)
Q: Can the 1SMB18A TR13 PBFREE be used as a direct replacement for SMBJ18AE3/TR13?
A: Yes. The 1SMB18A TR13 PBFREE maintains identical electrical specifications: 18V reverse standoff voltage, 20V breakdown voltage, 29.2V clamping voltage, and 20.5A peak pulse current at 600W peak pulse power. Both parts are packaged in DO-214AA (SMB) surface mount format and are ROHS3 compliant. The primary difference is manufacturer (Central Semiconductor Corp versus Microchip Technology).
Q: What is the difference between direct substitutes and similar substitutes?
A: Direct substitutes maintain identical electrical specifications across all critical parameters (voltage ratings, peak pulse current, and power dissipation). Similar substitutes maintain the same voltage ratings but exhibit variations in peak pulse current or power dissipation. For example, SACB18 operates at 15A peak pulse current versus 20.5A for the primary part, making it suitable only for applications with lower transient energy requirements.
Q: Does the SMBJ18A-TP have any advantages over the primary part?
A: The SMBJ18A-TP extends the upper operating temperature limit to 175°C, compared to 150°C for the SMBJ18AE3/TR13. All other electrical specifications remain identical. This extended temperature range is beneficial for applications operating in elevated ambient or junction temperature environments.
Q: Is the SACB18 suitable for all applications using SMBJ18AE3/TR13?
A: No. The SACB18 operates at 15A peak pulse current and 500W peak pulse power, compared to 20.5A and 600W for the primary part. The SACB18 is suitable only for applications where transient current levels do not exceed 15A and where the reduced power dissipation capacity is acceptable. The clamping voltage is also marginally lower at 28.8V versus 29.2V.
Q: Are all substitute parts available in Tape & Reel packaging?
A: Most direct substitutes are available in Tape & Reel (TR) format. The SMBJ18A-E3/52 (Vishay) is supplied in Cut Tape (CT) & Digi-Reel® format. The SMBJ18A variants from EVVO Semi are supplied in Cut Tape (CT) & Digi-Reel® format. Packaging format should be verified against procurement requirements before part selection.
Q: What is the significance of the operating temperature range difference between parts?
A: The primary part SMBJ18AE3/TR13 operates from -65°C to 150°C. Several substitutes (SMBJ18A-13-F, SMBJ18A-E3/52, SACB18, SMBJ18A-TR) operate from -55°C to 150°C, representing a narrower lower temperature range. The SMBJ18A-TP extends to 175°C at the upper limit. Selection should match the application's required operating temperature envelope.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All substitute parts listed are ROHS3 compliant and possess MSL 1 (Unlimited) moisture sensitivity ratings, matching the compliance status of the primary part SMBJ18AE3/TR13.
Q: Can SMBJ18A-TR from STMicroelectronics be used interchangeably with the primary part?
A: Yes, with the note that SMBJ18A-TR exhibits a peak pulse current of 21.5A compared to 20.5A for the primary part. This 1A increase is within the same functional class and does not represent a limitation. The part is suitable for direct substitution in applications where the slightly elevated current capacity is acceptable or beneficial.
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