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SMBJ18-E3/52 Equivalent & Substitute Parts
Part Overview
The SMBJ18-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 operates with an 18V reverse standoff voltage and provides 32.2V maximum clamping voltage at peak pulse current. The part is currently listed as obsolete, making equivalent substitutes necessary for ongoing design support and procurement.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | SMBJ18-E3/52 |
| Manufacturer | Vishay General Semiconductor - Diodes Division |
| Category | Transient Voltage Suppressors (TVS) |
| Type | Zener |
| Unidirectional Channels | 1 |
| Voltage - Reverse Standoff (Typ) | 18V |
| Voltage - Breakdown (Min) | 20V |
| Voltage - Clamping (Max) @ Ipp | 32.2V |
| Current - Peak Pulse (10/1000µs) | 18.6A |
| Power - Peak Pulse | 600W |
| Operating Temperature Range | -55°C to 150°C (TJ) |
| Mounting Type | Surface Mount |
| Package / Case | DO-214AA, SMB |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution of the SMBJ18-E3/52 is determined by the following critical parameters:
- Reverse Standoff Voltage: Must be 18V (all substitutes maintain this specification)
- Breakdown Voltage (Min): Must be 20V (all substitutes maintain this specification)
- Package Type: DO-214AA or SMB equivalent (mechanical and electrical compatibility)
- Unidirectional Configuration: Single channel Zener diode (all substitutes maintain this)
- Mounting Type: Surface Mount (all substitutes are surface mount)
- RoHS Compliance: ROHS3 Compliant (all substitutes meet this requirement)
- Moisture Sensitivity: MSL 1 (all substitutes meet this requirement)
Substitutes are grouped into two categories based on clamping voltage and peak pulse current characteristics:
Group A (Matched Clamping Voltage 32.2V): SMBJ18E3/TR13 from Microchip Technology maintains identical clamping voltage and peak pulse current specifications.
Group B (Lower Clamping Voltage 29.2V, Higher Peak Pulse Current): SMBJ18A-E3/52, SMBJ18A, SMBJ18A-13-F, SMBJ18A-HR, SMBJ18A-HRA, and SMBJ18A-TP offer reduced clamping voltage with increased peak pulse current handling.
Group C (Manufacturer-Recommended Alternative): SACB18 from Littelfuse Inc. operates at 28.8V clamping voltage with 15A peak pulse current in SMB package.
Parameter Comparison
| Part Number | Manufacturer | Voltage - Reverse Standoff (Typ) | Voltage - Breakdown (Min) | Voltage - Clamping (Max) @ Ipp | Current - Peak Pulse (10/1000µs) | Power - Peak Pulse | Operating Temperature | Package / Case | Product Status |
|---|---|---|---|---|---|---|---|---|---|
| SMBJ18-E3/52 | Vishay General Semiconductor | 18V | 20V | 32.2V | 18.6A | 600W | -55°C to 150°C | DO-214AA, SMB | Obsolete |
| SMBJ18A-E3/52 | Vishay General Semiconductor | 18V | 20V | 29.2V | 20.5A | 600W | -55°C to 150°C | DO-214AA, SMB | Active |
| SMBJ18E3/TR13 | Microchip Technology | 18V | 20V | 32.2V | 18.6A | 600W | -65°C to 150°C | DO-214AA, SMB | Active |
| SACB18 | Littelfuse Inc. | 18V | 20V | 28.8V | 15A | 500W | -55°C to 150°C | DO-214AA, SMB | Active |
| SMBJ18A | EVVO Semi | 18V | 20V | 29.2V | 20.6A | 600W | -65°C to 150°C | DO-214AC, SMA | Active |
| SMBJ18A-13-F | Diodes Incorporated | 18V | 20V | 29.2V | 20.5A | 600W | -55°C to 150°C | DO-214AA, SMB | Active |
| SMBJ18A-HR | Littelfuse Inc. | 18V | 20V | 29.2V | 20.6A | 600W | -65°C to 150°C | DO-214AA, SMB | Active |
| SMBJ18A-HRA | Littelfuse Inc. | 18V | 20V | 29.2V | 20.6A | 600W | -65°C to 150°C | DO-214AA, SMB | Active |
| SMBJ18A-TP | Micro Commercial Co | 18V | 20V | 29.2V | 20.5A | 600W | -55°C to 175°C | DO-214AA, SMB | Active |
Engineering Selection Recommendations
Direct Replacement (Identical Electrical Performance): SMBJ18E3/TR13 from Microchip Technology is the direct electrical equivalent, maintaining 32.2V clamping voltage and 18.6A peak pulse current. This part is in active production status with extended operating temperature range (-65°C to 150°C) and meets all compliance requirements (ROHS3, MSL 1).
Primary Active Substitute (Vishay Ecosystem): SMBJ18A-E3/52 from Vishay General Semiconductor is the manufacturer's active-production equivalent within the same product family. While clamping voltage is reduced to 29.2V, peak pulse current increases to 20.5A, and the part maintains identical operating temperature range and packaging. This option provides continuity within the Vishay TransZorb® series.
Alternative Substitutes (Active Production): SMBJ18A-13-F (Diodes Incorporated), SMBJ18A-HR and SMBJ18A-HRA (Littelfuse Inc.), and SMBJ18A-TP (Micro Commercial Co) all operate at 29.2V clamping voltage with 20.5A to 20.6A peak pulse current. All are in active production and ROHS3 compliant. SMBJ18A-TP offers extended temperature range to 175°C. Package compatibility is maintained across all options in DO-214AA SMB format.
Manufacturer-Recommended Alternative: SACB18 from Littelfuse Inc. operates at 28.8V clamping voltage with 15A peak pulse current and 500W peak pulse power. This part is suitable for applications with lower current requirements and is in active production status.
Frequently Asked Questions (FAQ)
Q: Can SMBJ18A-E3/52 directly replace SMBJ18-E3/52? A: Yes. Both parts maintain 18V reverse standoff voltage, 20V minimum breakdown voltage, and identical operating temperature range. The reduced clamping voltage (29.2V vs 32.2V) and increased peak pulse current (20.5A vs 18.6A) are within the same electrical protection class and package format (DO-214AA SMB).
Q: What is the difference between SMBJ18E3/TR13 and SMBJ18A-E3/52? A: SMBJ18E3/TR13 maintains identical clamping voltage (32.2V) and peak pulse current (18.6A) to the original part but is manufactured by Microchip Technology. SMBJ18A-E3/52 is from Vishay with reduced clamping voltage (29.2V) but higher peak pulse current (20.5A). Both are electrically compatible substitutes with different performance characteristics.
Q: Are all substitutes compatible with DO-214AA SMB packages? A: Most substitutes use DO-214AA SMB packaging. SMBJ18A from EVVO Semi uses DO-214AC SMA packaging, which has different mechanical dimensions. Verify PCB footprint compatibility before selection.
Q: Does operating temperature range affect substitution? A: Operating temperature range does not prevent substitution. SMBJ18E3/TR13 and SMBJ18A variants offer extended range (-65°C to 150°C or higher), which is compatible with applications designed for the original -55°C to 150°C range.
Q: Are all substitutes RoHS3 compliant? A: Yes. All listed substitutes are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level, matching the original part's compliance status.
Q: What is the difference between SMBJ18A-HR and SMBJ18A-HRA? A: Both parts from Littelfuse Inc. maintain identical electrical specifications (29.2V clamping, 20.6A peak pulse current, -65°C to 150°C operating range) and DO-214AA SMB packaging. The suffix designates different product variants within the SMBJ-HR and SMBJ-HRA series lines.
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