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SMBJ18C-E3/5B Equivalent & Substitute Parts
Part Overview
The SMBJ18C-E3/5B is a transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, designed for general-purpose overvoltage protection in surface-mount applications. This part operates with an 18V reverse standoff voltage and provides 32.2V maximum clamping voltage at peak pulse current. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Reverse Standoff Voltage (Typ) | 18V |
| Breakdown Voltage (Min) | 20V |
| Clamping Voltage (Max) @ Ipp | 32.2V |
| Peak Pulse Current (10/1000µs) | 18.6A |
| Peak Pulse Power | 600W |
| Operating Temperature Range | -55°C to 150°C (TJ) |
| Package Type | DO-214AA (SMB) |
| Mounting Type | Surface Mount |
| Bidirectional Channels | 1 |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution for the SMBJ18C-E3/5B is determined by the following critical parameters:
- Reverse Standoff Voltage: Must be 18V (Typ)
- Breakdown Voltage: Must be minimum 20V
- Package: Must be DO-214AA or SMB equivalent
- Mounting Type: Must be Surface Mount
- Bidirectional Channels: Must be 1
- RoHS Compliance: Must be ROHS3 Compliant
Substitute parts are grouped into two categories based on clamping voltage performance:
Group A (Matched Clamping Voltage - 32.2V): Parts with identical clamping voltage specifications, suitable for direct replacement where the original electrical performance is required.
Group B (Alternative Clamping Voltage - 29.2V): Parts with lower clamping voltage but higher peak pulse current capability, suitable for applications where slightly reduced clamping voltage is acceptable within system design margins.
Parameter Comparison
| Manufacturer | Part Number | Product Status | Clamping Voltage (Max) @ Ipp | Peak Pulse Current (10/1000µs) | Operating Temperature Range | Package |
|---|---|---|---|---|---|---|
| Vishay General Semiconductor | SMBJ18C-E3/5B | Obsolete | 32.2V | 18.6A | -55°C to 150°C | DO-214AA (SMBJ) |
| Vishay General Semiconductor | SMBJ18CA-E3/5B | Active | 29.2V | 20.5A | -55°C to 150°C | DO-214AA (SMBJ) |
| Microchip Technology | SMBJ18CE3/TR13 | Active | 32.2V | 18.6A | -65°C to 150°C | SMBJ (DO-214AA) |
| Littelfuse Inc. | SMBJ18CA-HRA | Active | 29.2V | 20.6A | -65°C to 150°C | DO-214AA (SMBJ) |
| Central Semiconductor Corp | 1SMB18CA TR13 PBFREE | Active | 29.2V | 20.5A | -65°C to 150°C | DO-214AA, SMB |
| MDD | SMBJ18CA | Active | 29.2V | 20.6A | -50°C to 150°C | DO-214AA, SMB |
| Diodes Incorporated | SMBJ18CA-13-F | Active | 29.2V | 20.5A | -55°C to 150°C | DO-214AA, SMB |
| Micro Commercial Co | SMBJ18CA-TP | Active | 29.2V | 20.5A | -55°C to 175°C | DO-214AA (SMB) |
| STMicroelectronics | SMBJ18CA-TR | Active | 29.2V | 21.5A | -55°C to 150°C | DO-214AA, SMB |
Engineering Selection Recommendations
Primary Recommendation (Matched Performance): SMBJ18CE3/TR13 (Microchip Technology) provides identical clamping voltage (32.2V) and peak pulse current (18.6A) specifications to the original SMBJ18C-E3/5B. This part is active and ROHS3 compliant, with extended operating temperature range (-65°C to 150°C). Selection of this part eliminates any electrical performance variation.
Secondary Recommendations (Alternative Performance): SMBJ18CA-E3/5B (Vishay), SMBJ18CA-HRA (Littelfuse), SMBJ18CA-13-F (Diodes Incorporated), SMBJ18CA-TP (Micro Commercial Co), and SMBJ18CA-TR (STMicroelectronics) are all active products with 29.2V clamping voltage and higher peak pulse current ratings (20.5A to 21.5A). These parts are suitable for applications where the reduced clamping voltage remains within system design tolerances. All are ROHS3 compliant.
High-Volume Alternative: SMBJ18CA (MDD) offers the largest inventory availability (143,300 pcs) with 29.2V clamping voltage and 20.6A peak pulse current. This part is active and ROHS3 compliant, though with a narrower operating temperature range (-50°C to 150°C).
All substitute parts maintain the same package type (DO-214AA/SMB), mounting configuration (surface mount), and bidirectional channel count (1) as the original part.
Frequently Asked Questions (FAQ)
Q: Can SMBJ18CA-E3/5B be used as a direct replacement for SMBJ18C-E3/5B?
A: SMBJ18CA-E3/5B is electrically compatible in terms of reverse standoff voltage (18V), breakdown voltage (20V minimum), and package type (DO-214AA). However, the clamping voltage differs: SMBJ18CA-E3/5B specifies 29.2V maximum versus 32.2V for the original part. This 3V difference must be evaluated against your circuit's overvoltage protection requirements.
Q: What is the difference between Group A and Group B substitutes?
A: Group A substitutes (SMBJ18CE3/TR13) maintain the original 32.2V clamping voltage specification. Group B substitutes feature 29.2V clamping voltage with correspondingly higher peak pulse current ratings (20.5A to 21.5A versus 18.6A). Selection depends on whether your application requires matched clamping voltage or can tolerate the lower clamping specification.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All listed substitute parts are ROHS3 compliant and carry REACH Unaffected status, matching the compliance profile of the original SMBJ18C-E3/5B.
Q: Does operating temperature range affect substitution compatibility?
A: Operating temperature range does not prevent substitution but should be verified against your application requirements. The original part specifies -55°C to 150°C. Microchip SMBJ18CE3/TR13, Littelfuse SMBJ18CA-HRA, and Central Semiconductor 1SMB18CA TR13 PBFREE extend the lower limit to -65°C. MDD SMBJ18CA narrows the lower limit to -50°C. Micro Commercial Co SMBJ18CA-TP extends the upper limit to 175°C.
Q: Can I use SMBJ18CA (MDD) in high-volume production?
A: Yes. SMBJ18CA from MDD is active with the largest inventory (143,300 pcs), making it suitable for high-volume applications. Verify that the 29.2V clamping voltage and -50°C to 150°C operating range meet your design specifications.
Q: What packaging options are available for these substitutes?
A: All substitute parts use DO-214AA or SMB package designations, which are mechanically and electrically equivalent. Packaging formats vary by manufacturer: some offer Tape & Reel (TR), Cut Tape (CT), or bulk packaging. Confirm packaging availability with your supplier based on assembly requirements.
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