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Vishay General Semiconductor - Diodes Division SMCJ18AHE3/57T
- Part No.:
- SMCJ18AHE3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ18AHE3/57T.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,208
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Product details
Overview
SMCJ18AHE3/57T from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. It features a 18 V standoff voltage (VWM), 20.0–22.1 V breakdown voltage (VBR) at 1 mA test current, 29.2 V maximum clamping voltage (VC) at 51.4 A peak pulse current (IPPM), and 1500 W peak pulse power dissipation (PPPM) with 10/1000 µs waveform.
For engineers reviewing the SMCJ18AHE3/57T datasheet, SMCJ18AHE3/57T pinout, SMCJ18AHE3/57T application, or SMCJ18AHE3/57T equivalent, key selection criteria include clamping performance under 51.4 A surge, thermal resistance (RθJA = 75 °C/W), AEC-Q101 qualification for automotive use, RoHS compliance, and compatibility with automated SMT placement on standard PCB copper pads.
Technical Context
The SMCJ18AHE3/57T operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its breakdown threshold (VBR), thereby shunting transient energy to ground. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance, enabling fast response time (<1 ns) and consistent clamping behavior across temperature.
Designed for surface-mount implementation on 8.0 mm × 8.0 mm copper pads per terminal, it delivers 1500 W peak pulse power handling while maintaining a maximum junction temperature of +150 °C. The device meets MSL Level 1 per J-STD-020 and supports lead-free reflow up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before conduction begins; defines safe signal line operating margin. |
| VBR min/max | 20.0 V / 22.1 V at IT = 1 mA - Confirmed breakdown range ensures reliable triggering without premature conduction. |
| VC @ IPPM | 29.2 V at 51.4 A - Clamping voltage during full-rated 10/1000 µs surge; determines protected circuit's maximum transient overvoltage. |
| PPPM | 1500 W - Peak transient power absorption capability; enables robust protection against IEC 61000-4-5 Level 4 surges. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance; informs heatsinking requirements for sustained power dissipation. |
| TJ max | +150 °C - Maximum allowable junction temperature; sets upper limit for ambient + self-heating in high-reliability designs. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 2.06 mm height and 7.75 mm length; compatible with JEDEC MS-013. |
Pinout & Package
SMCJ18AHE3/57T uses the SMC (DO-214AB) package: a 2-terminal, surface-mount, molded plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Polarity is marked by a cathode band on the body end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or lower-potential rail in unidirectional TVS configuration. |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 18 V supply or signal); conducts during overvoltage events to clamp to VC. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock per stress test requirements. |
| Glass passivated junction | Ensures stable VBR tolerance and long-term parameter stability under repeated surge stress and thermal cycling. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients, improving clamping fidelity for sub-microsecond ESD or EFT events. |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow without baking; supports high-volume automated assembly without moisture sensitivity concerns. |
| RoHS-compliant & halogen-free option | Base P/NHE3 suffix confirms compliance with EU RoHS Directive 2011/65/EU and halogen-free material requirements (IEC 61249-2-21). |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-connected ECUs, body control modules, and infotainment systems from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp surges above 18 V while remaining inert during normal operation. Use Value: Withstands 1500 W peak pulses and maintains clamping at ≤29.2 V, preventing damage to downstream DC-DC converters and microcontrollers rated for ≤30 V absolute maximum. | Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature, position) in PLCs and motor drives exposed to field wiring-induced surges. IC Role / Device Role / Timing Role: Connected anode-to-ground, cathode-to-signal line to suppress fast transients on 0–5 V or 0–10 V analog channels without affecting DC accuracy. Use Value: Low leakage (<1 µA at 18 V) preserves signal integrity; fast response (<1 ns) prevents transient coupling into ADC front-ends or op-amp inputs. |
| Telecom Line Card Surge Protection | Consumer Power Adapter Input Stage |
Use Scenario: Secondary-side transient suppression on Ethernet PHY power rails or PoE-powered device inputs subjected to induced lightning surges. IC Role / Device Role / Timing Role: Mounted directly at connector entry point on +3.3 V or +5 V bias lines to divert surge current before reaching Ethernet controller ICs. Use Value: 29.2 V clamping ensures protected ICs with 6 V absolute max ratings remain within safe operating limits during IEC 61000-4-5 4 kV tests. | Use Scenario: Input-stage overvoltage protection in AC/DC adapters for smart home devices, where rectified DC bus may experience line-related spikes. IC Role / Device Role / Timing Role: Placed across bulk capacitor terminals to clamp surges exceeding 18 V, complementing primary-side MOVs and fuses. Use Value: 1500 W PPPM rating handles repetitive line-switching transients; SMC package allows compact layout adjacent to high-voltage nodes without creepage concerns. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18AHE3/52T | Lower PPPM (600 W), smaller SMB (DO-214AA) package, same VWM/VBR/VC specs. | Reduced surge handling capacity; suitable only for lower-energy transients (e.g., ESD, EFT), not load dump. | Select when board space is constrained and surge threat level is limited to IEC 61000-4-2/4-4. |
| SMCJ18CAHE3/57T | Bidirectional variant; identical VWM (18 V), VBR (20.0–22.1 V), VC (29.2 V), and PPPM (1500 W), but symmetrical clamping in both polarities. | Required for AC-coupled or floating signal lines where polarity reversal occurs (e.g., RS-485, CAN bus). | Choose for bidirectional protection needs; note that cathode marking is omitted and device has no polarity indicator. |
Compared with SMCJ18AHE3/57T, SMBJ18AHE3/52T trades surge robustness for footprint reduction, while SMCJ18CAHE3/57T provides identical unidirectional clamping performance in both directions-making it essential for AC or differential signal protection but unnecessary for DC rail applications.
Availability
SMCJ18AHE3/57T is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, telecom line cards, and consumer power adapter designs requiring stable component supply, AEC-Q101 qualification, and repeatable 1500 W transient suppression performance.
Supply support for SMCJ18AHE3/57T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in automotive, industrial, and communications infrastructure where failure modes must be mitigated without compromising signal integrity or thermal stability.
FAQ
What is the clamping voltage of the SMCJ18AHE3/57T under maximum rated surge current?
The SMCJ18AHE3/57T exhibits a maximum clamping voltage (VC) of 29.2 V when subjected to its rated peak pulse current (IPPM) of 51.4 A using the standard 10/1000 µs waveform. This value is measured at the device terminals under specified test conditions and defines the upper voltage limit imposed on the protected circuit during worst-case transient events. The SMCJ18AHE3/57T maintains this clamping performance across its operational temperature range, supporting robust design margins for downstream ICs with 30 V absolute maximum ratings.
Is the SMCJ18AHE3/57T qualified for automotive applications?
Yes, the SMCJ18AHE3/57T carries AEC-Q101 qualification, confirming its suitability for automotive electronic systems. This qualification includes rigorous stress testing for temperature cycling, high-temperature operating life, unbiased highly accelerated stress testing (uHAST), and mechanical shock-all performed per the AEC-Q101 standard. The HE3 suffix explicitly denotes RoHS-compliant and AEC-Q101-qualified construction, making the SMCJ18AHE3/57T appropriate for engine control units, ADAS sensors, and body electronics where reliability under harsh environmental conditions is mandatory.
How does the SMCJ18AHE3/57T differ from the bidirectional SMCJ18CAHE3/57T?
The SMCJ18AHE3/57T is unidirectional, meaning it conducts only when the cathode is at higher potential than the anode-ideal for DC rail protection. In contrast, the SMCJ18CAHE3/57T is bidirectional, providing symmetrical clamping for both positive and negative voltage excursions, required for AC or differential signal lines like RS-485 or CAN. Both share identical VWM (18 V), VBR (20.0–22.1 V), VC (29.2 V), and PPPM (1500 W), but the SMCJ18AHE3/57T includes a visible cathode band while the CA version has no polarity marking. The SMCJ18AHE3/57T cannot replace the CA variant in bidirectional applications.
What is the thermal resistance and maximum junction temperature of the SMCJ18AHE3/57T?
The SMCJ18AHE3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the recommended 8.0 mm × 8.0 mm copper pad per terminal, and a maximum junction temperature (TJ max) of +150 °C. These values define the device's ability to dissipate surge energy without thermal runaway: under continuous DC power dissipation, the 6.5 W rating limits steady-state heating, while transient surges rely on short-duration thermal mass. For reliable long-term operation in high-ambient environments, board-level thermal design-including copper area and airflow-must ensure TJ remains below +150 °C during worst-case surge repetition.
Does the SMCJ18AHE3/57T require special PCB layout considerations?
Yes-the SMCJ18AHE3/57T requires adherence to Vishay's recommended mounting pad layout: 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal, with minimum trace width and spacing to avoid current crowding and thermal bottlenecks. Short, direct traces to ground planes minimize inductance and preserve clamping speed. The SMC (DO-214AB) package's cathode band must be correctly oriented per silkscreen, and the device must be placed as close as possible to the protected interface connector or IC pin. Failure to follow these guidelines risks elevated clamping voltage due to parasitic inductance and reduced surge current handling capability.
SMCJ18AHE3/57T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 29.2V
- Current - Peak Pulse (10/1000µs):
- 51.4A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ18AHE3/57T FAQ
1.How can I place an order for SMCJ18AHE3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ18AHE3/57T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SMCJ18AHE3/57T reliable?
The price and inventory of SMCJ18AHE3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ18AHE3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ18AHE3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ18AHE3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ18AHE3/57T?
SMCJ18AHE3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ18AHE3/57T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SMCJ18AHE3/57T?
For technical support, including SMCJ18AHE3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ18AHE3/57T requirements.
6.How does Aetrix verify that SMCJ18AHE3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ18AHE3/57T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SMCJ18AHE3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ18AHE3/57T?
All SMCJ18AHE3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ18AHE3/57T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SMCJ18AHE3/57T part is unused and in its original packaging.
Return procedure for SMCJ18AHE3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ18AHE3/57T Tags
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