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Vishay General Semiconductor - Diodes Division SMCJ18CAHE3_A/I
- Part No.:
- SMCJ18CAHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ18CAHE3_A/I.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,869
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Product details
Overview
SMCJ18CAHE3_A/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 18 V standoff voltage (VWM), 20.0–22.1 V breakdown voltage (VBR) at 1 mA, 1500 W peak pulse power (10/1000 µs), clamping voltage of 29.2 V at 51.4 A, and operates from –55 °C to +150 °C - deployed in automotive sensor signal lines and industrial I/O interfaces.
For engineers reviewing the SMCJ18CAHE3_A/I datasheet, SMCJ18CAHE3_A/I pinout, SMCJ18CAHE3_A/I application, or SMCJ18CAHE3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 1500 W surge rating, low clamping ratio (VC/VBR ≈ 1.4), and compatibility with automated SMT assembly on 8 mm × 8 mm copper pads.
Technical Context
This bidirectional TVS diode uses a glass-passivated silicon junction to achieve sub-nanosecond response time and low incremental surge resistance. Its symmetrical breakdown behavior ensures identical clamping in both polarities, making it suitable for AC-coupled or floating signal paths where polarity reversal is possible.
The device meets MSL Level 1 per J-STD-020 (peak reflow ≤ 260 °C), supports 200 A non-repetitive forward surge current (IFSM), and exhibits a temperature coefficient of VBR at +0.092 %/°C - enabling stable performance across automotive under-hood temperature ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - maximum continuous reverse operating voltage before significant leakage; defines safe working range for protected circuitry. |
| VBR min/max | 20.0 V / 22.1 V at 1 mA - guaranteed breakdown threshold window; ensures predictable turn-on during transients. |
| VC @ IPPM | 29.2 V at 51.4 A - clamped voltage during 10/1000 µs surge; determines maximum stress imposed on downstream ICs. |
| PPPM | 1500 W - peak pulse power handling (10/1000 µs); quantifies energy absorption capacity without failure. |
| TJ max | +150 °C - maximum junction temperature; enables operation in high-ambient environments like engine control units. |
| Package | SMC (DO-214AB) - surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; optimized for automated placement and thermal dissipation. |
| AEC-Q101 | Qualified - certified for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC standard. |
Pinout & Package
SMCJ18CAHE3_A/I is housed in an SMC (DO-214AB) package with two terminals: anode and cathode. As a bidirectional device, it has no polarity marking; both terminals are functionally symmetric and interchangeable in circuit layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (positive half-cycle) | Conducts surge current when voltage exceeds +VBR; forms one side of symmetrical clamping path. |
| Cathode | Transient current entry point (negative half-cycle) | Conducts surge current when voltage exceeds –VBR; completes bidirectional clamping loop with anode. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC or floating nodes without polarity constraints - eliminates need for dual unidirectional devices. |
| AEC-Q101 qualification | Validated for automotive applications including engine management, ADAS sensors, and body electronics requiring long-term field reliability. |
| 1500 W peak pulse power | Withstands ISO 7637-2 Pulse 1, 2a, 3a/b, and IEC 61000-4-5 surges without degradation when mounted per recommended pad layout. |
| Glass passivated junction | Provides stable leakage performance (<1 µA at VWM), low capacitance (~100 pF at 0 V), and immunity to humidity-induced parameter drift. |
| MSL Level 1 rating | Allows direct placement into standard lead-free reflow profiles (peak 260 °C) without baking or special handling. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and inductive switching transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between signal line and ground, limiting transient excursions to ≤29.2 V. Use Value: Prevents latch-up or gate oxide damage in 3.3 V/5 V interface ICs while maintaining signal integrity during normal operation. | Use Scenario: Shielding digital input modules in programmable logic controllers from 24 V DC supply transients and relay contact bounce. IC Role / Device Role / Timing Role: Standoff protector on dry-contact or optocoupler input stage, absorbing >1 kV spikes without affecting logic thresholds. Use Value: Extends mean time between failures (MTBF) by eliminating false triggering and component overstress in factory automation systems. |
| Telecom Line Interface | Consumer Power Adapter Output |
Use Scenario: Safeguarding Ethernet PHYs and PoE injectors against lightning-induced surges on twisted-pair data lines. IC Role / Device Role / Timing Role: Secondary-level TVS on differential pair, coordinated with primary GDT or MOV to meet IEC 61000-4-5 Level 4. Use Value: Achieves <10 ns response and <30 V clamping to preserve signal eye diagram integrity and prevent PHY reset events. | Use Scenario: Output-side surge suppression in USB-C PD and 12 V wall adapters exposed to mains coupling and hot-plug events. IC Role / Device Role / Timing Role: Final-stage clamp after DC-DC converter, limiting output rail overshoot during short-circuit recovery or cable discharge. Use Value: Ensures compliance with UL 62368-1 transient immunity requirements while avoiding overvoltage shutdown of connected devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC18CA | Lower PPPM (600 W), same VWM (18 V), smaller SMA package (DO-214AC), higher RθJA (100 °C/W). | Not AEC-Q101 qualified; suited for cost-sensitive consumer products, not automotive. | Select SAC18CA only if surge energy is ≤600 W and automotive qualification is unnecessary. |
| SMCJ18CAHM3_A/I | Identical electrical specs and AEC-Q101 qualification; halogen-free molding compound (per JEDEC J-STD-020), same SMC package. | No functional difference; used where RoHS + halogen-free compliance is mandated (e.g., EU automotive Tier 1 programs). | Choose SMCJ18CAHM3_A/I when halogen-free material content is required by procurement policy or end-market regulation. |
Compared with SAC18CA and SMCJ18CAHM3_A/I, the SMCJ18CAHE3_A/I offers the highest surge energy handling (1500 W) in its class and maintains full AEC-Q101 compliance with standard RoHS-compliant construction - making it optimal for high-reliability automotive and industrial designs where both robustness and regulatory alignment are mandatory.
Availability
SMCJ18CAHE3_A/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC I/O hardening, and telecom line interface applications requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for SMCJ18CAHE3_A/I 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, rectifiers, MOSFETs, and protection devices 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 harsh environments - targeting automotive, industrial, and communications infrastructure where failure modes must be mitigated at the component level.
FAQ
What is the clamping voltage of SMCJ18CAHE3_A/I at its rated peak pulse current?
The SMCJ18CAHE3_A/I clamps to 29.2 V at its specified peak pulse current of 51.4 A (10/1000 µs waveform). This value is measured under standardized test conditions with the device mounted on 8.0 mm × 8.0 mm copper pads per JEDEC guidelines, ensuring repeatable performance validation across design labs and manufacturing sites. The clamping voltage directly determines the maximum stress applied to downstream ICs during surge events.
Is SMCJ18CAHE3_A/I suitable for automotive applications?
Yes, SMCJ18CAHE3_A/I is AEC-Q101 qualified and explicitly rated for automotive use. Its construction includes glass-passivated junctions, MSL Level 1 reflow compatibility, and validated performance across –55 °C to +150 °C junction temperature range - meeting requirements for engine control units, ADAS camera modules, and body electronics. The "HE3" suffix confirms this qualification per Vishay's ordering nomenclature.
How does the bidirectional nature of SMCJ18CAHE3_A/I affect its PCB layout?
The SMCJ18CAHE3_A/I has no polarity marking and functions identically in both directions, so PCB layout requires no orientation constraint - either terminal may connect to the protected line and the other to ground. This simplifies routing in differential or floating systems (e.g., RS-485, CAN FD) and eliminates risk of incorrect placement during automated assembly. No silkscreen polarity indicator is needed.
What is the maximum reverse leakage current of SMCJ18CAHE3_A/I at its standoff voltage?
At its 18 V standoff voltage (VWM), the SMCJ18CAHE3_A/I exhibits a maximum reverse leakage current (ID) of 1.0 µA at TA = 25 °C. This low leakage ensures minimal power loss and signal distortion in always-on circuits such as sensor bias networks or battery-backed communication lines, preserving accuracy and extending battery life in portable or remote monitoring systems.
Can SMCJ18CAHE3_A/I replace a unidirectional TVS like SMCJ18AHE3_A/I in an existing design?
No - SMCJ18CAHE3_A/I cannot directly replace SMCJ18AHE3_A/I without circuit review. While both share identical VWM (18 V) and PPPM (1500 W), the unidirectional version has a cathode band and conducts only in reverse bias, whereas the bidirectional SMCJ18CAHE3_A/I conducts symmetrically. Substitution may cause unintended conduction in DC-biased rails; verify signal topology and bias conditions before interchange.
SMCJ18CAHE3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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)
SMCJ18CAHE3_A/I FAQ
1.How can I place an order for SMCJ18CAHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ18CAHE3_A/I 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 SMCJ18CAHE3_A/I reliable?
The price and inventory of SMCJ18CAHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ18CAHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMCJ18CAHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ18CAHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ18CAHE3_A/I?
SMCJ18CAHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ18CAHE3_A/I 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 SMCJ18CAHE3_A/I?
For technical support, including SMCJ18CAHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ18CAHE3_A/I requirements.
6.How does Aetrix verify that SMCJ18CAHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMCJ18CAHE3_A/I 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 SMCJ18CAHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMCJ18CAHE3_A/I?
All SMCJ18CAHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ18CAHE3_A/I, 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 SMCJ18CAHE3_A/I part is unused and in its original packaging.
Return procedure for SMCJ18CAHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ18CAHE3_A/I Tags
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