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SMCJ18C-E3/9AT Transient Voltage Suppressor Diode – Equivalent & Substitute Parts
Part Overview
The SMCJ18C-E3/9AT is a bidirectional Zener 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 classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for new designs or production continuity.
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) | 46.6A |
| Peak Pulse Power | 1500W |
| Operating Temperature Range | -55°C to 150°C |
| Package Type | DO-214AB (SMC) |
| Mounting Type | Surface Mount |
| Bidirectional Channels | 1 |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the SMCJ18C-E3/9AT is determined by strict alignment of the following electrical and mechanical parameters:
- Reverse standoff voltage: 18V (required)
- Breakdown voltage minimum: 20V (required)
- Package: DO-214AB / SMC surface mount (required)
- Bidirectional channels: 1 (required)
- Operating temperature range: minimum -55°C to 150°C (required)
- RoHS3 compliance (required)
- Moisture sensitivity level: 1 (required)
Substitute parts are grouped into two categories based on clamping voltage and peak pulse current specifications:
Group A – Matched Electrical Performance (32.2V Clamping, 46.6A Ipp): Parts with identical clamping voltage and peak pulse current to the original component.
Group B – Alternative Electrical Performance (29.2V Clamping, 51.4A Ipp or higher): Parts with lower clamping voltage but higher peak pulse current, suitable for applications where lower voltage clamping is acceptable and higher current handling is beneficial.
Parameter Comparison
| Part Number | Manufacturer | Clamping Voltage (Max) @ Ipp | Peak Pulse Current | Peak Pulse Power | Operating Temperature | Product Status | Packaging |
|---|---|---|---|---|---|---|---|
| SMCJ18C-E3/9AT | Vishay General Semiconductor | 32.2V | 46.6A | 1500W | -55°C to 150°C | Obsolete | Bulk |
| SMCJ18CA-E3/9AT | Vishay General Semiconductor | 29.2V | 51.4A | 1500W | -55°C to 150°C | Active | Tape & Reel |
| SMCJ18CE3/TR13 | Microchip Technology | 32.2V | 46.6A | 1500W | -65°C to 150°C | Active | Tape & Reel |
| 5.0SMDJ18CA | MDE Semiconductor Inc | 29.2V | 172A | 5000W | -55°C to 150°C | Active | Tape & Reel |
| SMCJ18CA | EVVO Semi | 29.2V | 51.4A | 1500W | -55°C to 150°C | Active | Cut Tape & Digi-Reel |
| SMCJ18CA-13-F | Diodes Incorporated | 29.2V | 51.4A | 1500W | -55°C to 150°C | Active | Tape & Reel |
| SMCJ18CA-HR | Littelfuse Inc. | 29.2V | 51.4A | 1500W | -65°C to 150°C | Active | Tape & Reel |
| SMCJ18CA-HRA | Littelfuse Inc. | 29.2V | 51.4A | 1500W | -65°C to 150°C | Active | Tape & Reel |
| SMCJ18CA-HRAT7 | Littelfuse Inc. | 29.2V | 51.4A | 1500W | -65°C to 150°C | Active | Tape & Reel |
Engineering Selection Recommendations
Primary Selection – Matched Performance:
SMCJ18CE3/TR13 (Microchip Technology) is the preferred substitute when clamping voltage specification of 32.2V must be maintained. This part matches the original electrical performance exactly while offering active product status, extended operating temperature range (-65°C to 150°C), and standard tape & reel packaging for production environments.
Secondary Selection – Enhanced Current Handling:
SMCJ18CA-E3/9AT (Vishay General Semiconductor) provides an active alternative from the original manufacturer with 29.2V clamping voltage and 51.4A peak pulse current. This part maintains the same operating temperature range and power rating as the original, with the advantage of higher current capacity and active product status.
Alternative Selection – High-Power Applications:
5.0SMDJ18CA (MDE Semiconductor Inc) is suitable for applications requiring significantly higher transient energy absorption, offering 172A peak pulse current and 5000W peak pulse power. This part is appropriate only when the lower clamping voltage (29.2V) and higher current capacity align with circuit protection requirements.
Extended Temperature Range:
SMCJ18CA-HR, SMCJ18CA-HRA, and SMCJ18CA-HRAT7 (Littelfuse Inc.) provide -65°C to 150°C operating range, beneficial for applications in extreme thermal environments. All three variants maintain 29.2V clamping voltage and 51.4A peak pulse current.
All recommended substitutes maintain RoHS3 compliance, moisture sensitivity level 1, and DO-214AB / SMC surface-mount packaging compatibility with the original component.
Frequently Asked Questions (FAQ)
Q: Can SMCJ18CA-E3/9AT directly replace SMCJ18C-E3/9AT?
A: SMCJ18CA-E3/9AT is electrically compatible as a substitute. Both parts share the same 18V reverse standoff voltage, 20V minimum breakdown voltage, and DO-214AB package. The primary difference is clamping voltage (29.2V vs. 32.2V) and peak pulse current (51.4A vs. 46.6A). Substitution is valid when the circuit design tolerates 29.2V clamping voltage.
Q: What is the difference between SMCJ18CE3/TR13 and SMCJ18CA-E3/9AT?
A: SMCJ18CE3/TR13 maintains the original 32.2V clamping voltage and 46.6A peak pulse current, providing matched electrical performance. SMCJ18CA-E3/9AT reduces clamping voltage to 29.2V but increases peak pulse current to 51.4A. SMCJ18CE3/TR13 is the preferred choice when exact clamping voltage specification is critical.
Q: Are all substitute parts available in tape & reel packaging?
A: Most substitutes are available in tape & reel (TR) packaging for production use. SMCJ18CA (EVVO Semi) is supplied in cut tape and Digi-Reel format. Packaging selection depends on assembly equipment compatibility and production volume requirements.
Q: Does the extended temperature range of Littelfuse parts affect electrical performance?
A: The extended operating range (-65°C to 150°C vs. -55°C to 150°C) does not alter the electrical specifications at rated conditions. Extended range capability is beneficial for applications in extreme thermal environments but is not required for standard operating conditions.
Q: Is 5.0SMDJ18CA suitable as a direct replacement?
A: 5.0SMDJ18CA is not a direct replacement due to significantly different electrical characteristics: 172A peak pulse current and 5000W peak pulse power versus 46.6A and 1500W in the original. This part is appropriate only for high-energy transient protection applications where the circuit design specifically requires higher current handling and energy absorption capacity.
Q: What compliance certifications apply to all substitute parts?
A: All substitute parts listed maintain RoHS3 compliance, moisture sensitivity level 1 (unlimited), and REACH unaffected status, matching the regulatory requirements of the original SMCJ18C-E3/9AT component.
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