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SMCJ18CE3/TR13 Equivalent & Substitute Parts
Part Overview
The SMCJ18CE3/TR13 is a transient voltage suppressor (TVS) diode manufactured by Microchip Technology, designed for general-purpose overvoltage protection in surface-mount applications. This bidirectional Zener diode operates with an 18V reverse standoff voltage and provides clamping at 32.2V maximum, with a peak pulse current rating of 46.6A and peak pulse power of 1500W. The component is housed in a DO-214AB (SMC) package and is supplied in Tape & Reel packaging.
The product maintains Active status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Substitute parts are identified based on matching electrical characteristics within acceptable operating parameters and compatible mechanical packaging specifications.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 18 | V |
| Voltage - Breakdown (Min) | 20 | V |
| Voltage - Clamping (Max) @ Ipp | 32.2 | V |
| Current - Peak Pulse (10/1000µs) | 46.6 | A |
| Power - Peak Pulse | 1500 | W |
| Operating Temperature Range | -65 to 150 | °C |
| Mounting Type | Surface Mount | — |
| Package / Case | DO-214AB, SMC | — |
| Type | Zener | — |
| Bidirectional Channels | 1 | — |
Substitute Part Grouping Explanation
Substitute parts for the SMCJ18CE3/TR13 are qualified based on the following electrical and mechanical criteria:
Matching Parameters (Required for Substitution):
- Voltage - Reverse Standoff (Typ): 18V
- Voltage - Breakdown (Min): 20V
- Bidirectional Channels: 1
- Type: Zener
- Mounting Type: Surface Mount
- Package / Case: DO-214AB, SMC
Variable Parameters (Acceptable Ranges):
- Voltage - Clamping (Max) @ Ipp: 29.2V to 39.3V (within circuit protection requirements)
- Current - Peak Pulse (10/1000µs): 46.6A to 254A (higher ratings provide enhanced protection margin)
- Power - Peak Pulse: 1500W to 5000W (higher ratings acceptable for same application)
- Operating Temperature Range: -55°C to 175°C (encompasses or matches the -65°C to 150°C requirement)
All substitute parts maintain RoHS3 compliance, MSL 1 rating, and Active product status. Packaging format (Tape & Reel or Cut Tape) does not affect electrical substitution but may impact procurement logistics.
Parameter Comparison
| Part Number | Manufacturer | Voltage Standoff (V) | Voltage Breakdown Min (V) | Voltage Clamp Max (V) | Peak Pulse Current (A) | Peak Pulse Power (W) | Temp Range (°C) | Package |
|---|---|---|---|---|---|---|---|---|
| SMCJ18CE3/TR13 | Microchip Technology | 18 | 20 | 32.2 | 46.6 | 1500 | -65 to 150 | DO-214AB, SMC |
| 5.0SMDJ18CA | MDE Semiconductor Inc | 18 | 20 | 29.2 | 172 | 5000 | -55 to 150 | DO-214AB, SMC |
| SMCJ18CA | EVVO Semi | 18 | 20 | 29.2 | 51.4 | 1500 | -55 to 150 | DO-214AB, SMC |
| SMCJ18CA-13-F | Diodes Incorporated | 18 | 20 | 29.2 | 51.4 | 1500 | -55 to 150 | DO-214AB, SMC |
| SMCJ18CA-TP | Micro Commercial Co | 18 | 20 | 29.2 | 51.4 | 1500 | -55 to 175 | DO-214AB, SMC |
| SMCJ18CA-TR | STMicroelectronics | 18 | 20 | 39.3 | 254 | 1500 | -55 to 150 | DO-214AB, SMC |
| SMDJ18CA | Alpha & Omega Semiconductor Inc. | 18 | 20 | 29.2 | 102.8 | 3000 | -55 to 150 | DO-214AB, SMC |
| SMLJ18CA | Bourns Inc. | 18 | 20 | 29.2 | 102.8 | 3000 | -55 to 150 | DO-214AB, SMC |
| SMLJ18CA-TP | Micro Commercial Co | 18 | 20 | 29.2 | 102.8 | 3000 | -55 to 175 | DO-214AB, SMC |
Engineering Selection Recommendations
All listed substitute parts maintain electrical compatibility with the SMCJ18CE3/TR13 through matching reverse standoff voltage (18V) and breakdown voltage (20V minimum). Selection among substitutes is determined by application-specific requirements:
Direct Electrical Equivalents (Matched Peak Pulse Power): SMCJ18CA variants (EVVO Semi, Diodes Incorporated, Micro Commercial Co) and SMCJ18CA-TR (STMicroelectronics) provide 1500W peak pulse power matching the original specification. These parts are suitable for applications with identical transient energy requirements.
Enhanced Protection Margin (Higher Peak Pulse Power): SMDJ18CA (Alpha & Omega Semiconductor Inc.) and SMLJ18CA (Bourns Inc.) provide 3000W peak pulse power with 102.8A peak pulse current, offering increased protection margin for the same 18V standoff voltage. SMLJ18CA-TP extends operating temperature to 175°C.
Maximum Protection Capability: 5.0SMDJ18CA (MDE Semiconductor Inc) provides 5000W peak pulse power with 172A peak pulse current, suitable for high-energy transient environments. SMCJ18CA-TR (STMicroelectronics) offers 254A peak pulse current with 39.3V clamping voltage.
Temperature Considerations: Parts rated to -55°C to 175°C (SMCJ18CA-TP, SMLJ18CA-TP) accommodate extended low-temperature operation beyond the original -65°C specification. Original specification of -65°C to 150°C is maintained by SMCJ18CE3/TR13 and 5.0SMDJ18CA.
Compliance and Availability: All substitute parts maintain RoHS3 compliance, MSL 1 rating, and Active product status. Inventory availability ranges from 1,298 to 125,200 units across suppliers.
Frequently Asked Questions (FAQ)
Q: Can SMCJ18CA variants be used as direct replacements for SMCJ18CE3/TR13?
A: Yes. SMCJ18CA from EVVO Semi, Diodes Incorporated, and Micro Commercial Co provide identical electrical specifications (18V standoff, 20V breakdown, 29.2V clamp, 51.4A peak pulse current, 1500W peak pulse power) and DO-214AB SMC packaging. These parts are electrically and mechanically compatible.
Q: What is the difference between SMCJ18CA and SMDJ18CA?
A: Both maintain 18V standoff and 20V breakdown voltages with 29.2V clamping. SMDJ18CA provides higher peak pulse current (102.8A versus 51.4A) and peak pulse power (3000W versus 1500W). SMDJ18CA is suitable for applications requiring greater transient energy dissipation.
Q: Why does SMCJ18CA-TR from STMicroelectronics show 39.3V clamping voltage instead of 29.2V?
A: STMicroelectronics SMCJ18CA-TR maintains the same 18V standoff and 20V breakdown specifications but exhibits higher clamping voltage (39.3V) and significantly higher peak pulse current (254A). This represents a different design variant within the same voltage class, suitable for applications tolerating higher clamping voltages with enhanced current handling.
Q: Are there temperature rating differences among substitutes?
A: Yes. Most substitutes operate -55°C to 150°C. SMCJ18CA-TP (Micro Commercial Co) and SMLJ18CA-TP (Micro Commercial Co) extend the upper limit to 175°C. The original SMCJ18CE3/TR13 operates -65°C to 150°C, providing lower temperature capability than most substitutes.
Q: Does packaging format (Tape & Reel versus Cut Tape) affect electrical performance?
A: No. Packaging format affects only procurement and handling logistics. Tape & Reel and Cut Tape variants of the same part number provide identical electrical characteristics and performance.
Q: Which substitute provides the best protection margin for high-energy transient environments?
A: 5.0SMDJ18CA (MDE Semiconductor Inc) offers maximum protection with 5000W peak pulse power and 172A peak pulse current. SMCJ18CA-TR (STMicroelectronics) provides 254A peak pulse current with 39.3V clamping. Selection depends on whether peak power dissipation or peak current handling is the limiting factor in the application.
Q: Are all substitutes RoHS3 compliant?
A: Yes. All listed substitute parts maintain RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original SMCJ18CE3/TR13 specifications.
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