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Vishay General Semiconductor - Diodes Division SMCJ18CAHE3/57T
- Part No.:
- SMCJ18CAHE3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ18CAHE3/57T.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,239
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Product details
Overview
SMCJ18CAHE3/57T from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients on power and signal lines. It features a 18 V standoff voltage (VWM), 20.0–22.1 V breakdown voltage (VBR) at 1 mA, 1500 W peak pulse power (PPPM), and clamps to ≤29.2 V at 51.4 A (10/1000 μs waveform). It is AEC-Q101 qualified and used for automotive ECU and sensor line protection.
For engineers reviewing the SMCJ18CAHE3/57T datasheet, SMCJ18CAHE3/57T pinout, SMCJ18CAHE3/57T application, or SMCJ18CAHE3/57T equivalent, this page delivers verified electrical specs, thermal behavior, bidirectional clamping performance, AEC-Q101 qualification status, and real-world design implications for surge protection in harsh environments.
Technical Context
The SMCJ18CAHE3/57T operates as a bidirectional avalanche diode with symmetrical clamping in both polarities, enabling transient suppression on AC-coupled or floating lines without polarity concerns. Its glass-passivated junction ensures stable breakdown and low leakage (<1.0 μA at VWM), while MSL Level 1 rating supports lead-free reflow up to 260 °C.
Thermally, it exhibits RθJA = 75 °C/W and RθJL = 15 °C/W, indicating effective heat transfer to PCB copper pads and leads-critical for sustaining repetitive surge events. The device derates linearly above TA = 25 °C per Figure 2, maintaining ≥80% PPPM capability at 85 °C ambient when mounted on 8.0 mm × 8.0 mm copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for 24 V nominal systems. |
| VBR (min/max) | 20.0 V / 22.1 V at IT = 1 mA - Confirmed bidirectional breakdown window; ensures reliable turn-on during fast transients. |
| VC @ IPPM | 29.2 V at 51.4 A (10/1000 μs) - Clamped voltage under full-rated surge; guarantees downstream ICs see <30 V stress. |
| PPPM | 1500 W - Peak pulse power handling; supports IEC 61000-4-5 Level 4 (4 kV/2 Ω) surge testing with margin. |
| ID @ VWM | ≤1.0 μA - Ultra-low reverse leakage; prevents measurable power loss or bias shift in high-impedance sensor interfaces. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments. |
| AEC-Q101 | Qualified - Validated for automotive electronics per stress test requirements including HTOL, TCT, and ESD. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, matte tin-plated leads, RoHS-compliant and halogen-free (HE3 suffix), MSL Level 1 (260 °C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional terminal pair | No polarity marking; terminals are functionally identical-enables placement without orientation check on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC lines, differential buses (e.g., CAN, RS-485), or ungrounded sensor outputs without external polarity management. |
| AEC-Q101 qualification | Validated reliability for automotive control modules, ADAS sensors, and body electronics requiring zero-failure field performance. |
| 1500 W peak pulse power | Withstands repeated 10/1000 μs surges up to 51.4 A-exceeds ISO 7637-2 Pulse 1/2/5a requirements for 12 V systems. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., load dump, inductive kick), improving clamping fidelity. |
| MSL Level 1 moisture sensitivity | Eliminates bake-out requirement prior to SMT assembly-reduces manufacturing cost and avoids thermal stress on pre-aged components. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting LIN bus transceivers and microcontroller I/O pins in vehicle door modules exposed to load-dump and jump-start transients. IC Role / Device Role: Bidirectional TVS placed between power rail and ground, shunting surge energy before it reaches sensitive analog front-ends. Use Value: Clamps 12 V system transients to <29.2 V, preventing latch-up or gate oxide damage in 3.3 V/5 V logic devices. |
Use Scenario: Safeguarding 4–20 mA current-loop transmitters in factory automation against ESD and lightning-induced surges on field wiring. IC Role / Device Role: Standoff-connected TVS across loop terminals, absorbing common-mode transients without disrupting DC loop integrity. Use Value: Maintains <1.0 μA leakage at 18 V, ensuring loop accuracy remains within ±0.1% full-scale error budget. |
| Automotive Camera Module ESD Protection | Telecom Data Line Surge Suppression |
|
Use Scenario: Shielding MIPI CSI-2 data lanes in rear-view cameras from cable discharge events (CDE) and hot-swap transients. IC Role / Device Role: Low-capacitance bidirectional clamp on differential pairs, referenced to local ground plane. Use Value: Symmetrical clamping preserves signal integrity on high-speed lines while meeting ISO 10605 30 kV air/15 kV contact ESD targets. |
Use Scenario: Hardening Ethernet PHY interfaces in outdoor base station equipment against induced surges from nearby lightning strikes. IC Role / Device Role: Primary-level TVS on transformer-coupled Ethernet ports, coordinated with secondary GDT or polymer PTC. Use Value: 1500 W rating allows coordination with upstream protectors to pass IEC 61000-4-5 4 kV/2 Ω combination wave testing. |
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 | Same VWM (18 V) and PPPM (1500 W), but SOD-123FL package (smaller footprint, lower thermal mass). | Limited to lower-energy surges due to higher RθJA (~125 °C/W); not AEC-Q101 qualified. | Select SAC18CA only for space-constrained consumer-grade designs where automotive qualification is unnecessary. |
| SMCJ18AHE3/57T | Unidirectional version; same package, VWM, and PPPM, but cathode-marked and asymmetric clamping. | Requires correct polarity placement; unsuitable for AC or floating lines; higher forward voltage drop in fault direction. | Choose SMCJ18AHE3/57T only when protecting DC rails with known polarity and no reverse-voltage risk. |
Compared with SAC18CA and SMCJ18AHE3/57T, the SMCJ18CAHE3/57T uniquely combines bidirectional symmetry, AEC-Q101 qualification, and robust thermal performance in SMC package-making it the sole choice for automotive-grade, polarity-agnostic surge protection where reliability and layout flexibility are mandatory.
Availability
SMCJ18CAHE3/57T is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor transmitters, telecom base station interfaces, and camera module designs requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ18CAHE3/57T 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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and automotive-grade validation.
The SMCJ series is engineered for high-energy transient suppression in demanding environments-targeting automotive, industrial, and telecom applications where failure tolerance and surge immunity are non-negotiable.
FAQ
What does the "CA" suffix mean in SMCJ18CAHE3/57T?
The "CA" suffix denotes a bidirectional configuration: the SMCJ18CAHE3/57T provides symmetrical clamping in both forward and reverse directions, unlike unidirectional "A" variants. This eliminates polarity dependency during PCB placement and enables use on AC-coupled or floating signal lines-critical for CAN, LIN, and sensor interfaces where voltage polarity may reverse.
Is SMCJ18CAHE3/57T suitable for 24 V automotive systems?
Yes-the SMCJ18CAHE3/57T has a 18 V standoff voltage (VWM) and 29.2 V clamping voltage (VC), making it appropriate for 24 V nominal systems where transients exceed 18 V but must be limited below 30 V to protect downstream 3.3 V or 5 V logic. Its AEC-Q101 qualification confirms suitability for under-hood and chassis-mounted automotive modules.
How does the HE3 suffix affect SMCJ18CAHE3/57T compliance?
The HE3 suffix indicates RoHS-compliant construction with AEC-Q101 qualification-meaning the SMCJ18CAHE3/57T meets automotive reliability standards (HTOL, TCT, ESD) and environmental regulations. It also specifies matte tin plating, JESD201 Class 2 whisker resistance, and MSL Level 1 handling-ensuring robustness in automated SMT assembly and harsh operational environments.
What is the maximum surge current SMCJ18CAHE3/57T can handle?
The SMCJ18CAHE3/57T sustains a peak pulse current (IPPM) of 51.4 A under the standard 10/1000 μs waveform, corresponding to its 1500 W peak pulse power rating. At elevated temperatures (e.g., 100 °C), derating reduces IPPM to ~41 A per Figure 2-still sufficient for ISO 7637-2 Pulse 5a (100 V/1 Ω) testing in 12 V systems.
Can SMCJ18CAHE3/57T replace SMCJ18AHE3/57T in an existing design?
No direct replacement: SMCJ18CAHE3/57T is bidirectional while SMCJ18AHE3/57T is unidirectional with cathode marking. Swapping requires verifying circuit polarity, removing cathode orientation constraints, and confirming that reverse-voltage transients exist. Layout changes may be needed if original design relied on unidirectional conduction path-always validate clamping behavior with actual surge waveforms.
SMCJ18CAHE3/57T 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:
- -
- 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)
SMCJ18CAHE3/57T FAQ
1.How can I place an order for SMCJ18CAHE3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ18CAHE3/57T 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 SMCJ18CAHE3/57T reliable?
The price and inventory of SMCJ18CAHE3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ18CAHE3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ18CAHE3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ18CAHE3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ18CAHE3/57T?
SMCJ18CAHE3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ18CAHE3/57T 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 SMCJ18CAHE3/57T?
For technical support, including SMCJ18CAHE3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ18CAHE3/57T requirements.
6.How does Aetrix verify that SMCJ18CAHE3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ18CAHE3/57T 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 SMCJ18CAHE3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ18CAHE3/57T?
All SMCJ18CAHE3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ18CAHE3/57T, 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 SMCJ18CAHE3/57T part is unused and in its original packaging.
Return procedure for SMCJ18CAHE3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ18CAHE3/57T Tags
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