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Vishay General Semiconductor - Diodes Division SMCG18CAHE3/57T
- Part No.:
- SMCG18CAHE3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG18CAHE3/57T.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,111
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Product details
Overview
SMCG18CAHE3/57T from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in the SMCG (DO-215AB) surface-mount package, rated for 18 V standoff voltage (VWM), 20.0–22.1 V breakdown voltage (VBR), 1500 W peak pulse power (PPPM), and AEC-Q101 qualified for automotive electronics protection. It clamps transients to ≤32.4 V at 46.3 A (10/1000 µs waveform) and operates from –55 °C to +150 °C.
For engineers reviewing the SMCG18CAHE3/57T datasheet, SMCG18CAHE3/57T pinout, SMCG18CAHE3/57T application, or SMCG18CAHE3/57T equivalent, this device is selected for robust overvoltage protection on bidirectional signal lines, power rails, and sensor interfaces where low clamping voltage, fast response (<1 ns), and automotive-grade reliability are required.
Technical Context
The SMCG18CAHE3/57T is a glass-passivated, bidirectional Zener-based TVS diode designed to shunt high-energy transients-such as ESD, lightning-induced surges, and inductive switching spikes-away from sensitive downstream circuitry. Its symmetrical breakdown behavior ensures identical clamping in both polarities, with no polarity marking on the case.
It features low incremental surge resistance and meets MSL Level 1 per J-STD-020 (260 °C reflow peak), enabling compatibility with standard SMT assembly processes. Thermal resistance is RθJA = 75 °C/W (on 8.0 mm × 8.0 mm copper pads), supporting sustained operation up to TJ = 150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected line. |
| VBR min/max | 20.0 V / 22.1 V at 1 mA - Confirmed breakdown threshold range; ensures predictable turn-on under transient stress. |
| VC @ IPPM | 32.4 V at 46.3 A - Clamped voltage during 10/1000 µs surge; directly limits stress on downstream ICs like microcontrollers or CAN transceivers. |
| PPPM | 1500 W - Peak pulse power handling capability; supports IEC 61000-4-5 Level 4 (4 kV/2 Ω) surge immunity when properly laid out. |
| ID @ VWM | 1.0 µA - Reverse leakage at standoff voltage; negligible loading on low-power sensor or communication lines. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive environments and industrial enclosures. |
| AEC-Q101 | Qualified - Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces. |
Pinout & Package
Package: SMCG (DO-215AB) - Surface-mount, gull-wing leaded case with matte tin-plated terminals, UL 94 V-0 molding compound, and no polarity marking for bidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (positive half-cycle) | One of two symmetrical terminals; conducts during positive voltage excursions above VBR. |
| Cathode | Transient current entry (negative half-cycle) | Second symmetrical terminal; conducts during negative excursions - functionally identical to Anode in bidirectional mode. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over time and temperature; eliminates risk of moisture-induced parameter drift in humid environments. |
| AEC-Q101 qualification | Validates reliability for automotive applications including 1000+ thermal cycles, HTRB, and ESD testing per AEC standards. |
| MSL Level 1 rating | Supports single-reflow assembly without baking; compatible with standard 260 °C peak reflow profiles. |
| Low clamping ratio (VC/VBR ≈ 1.5) | Minimizes overvoltage overshoot during surge events, protecting 3.3 V and 5 V logic interfaces without additional series impedance. |
Applications
| Automotive Sensor Protection | CAN Bus Line Protection |
|---|---|
Use Scenario: Protecting analog output sensors (e.g., pressure, temperature) in engine control modules exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across sensor supply and ground pins to absorb ±100 V transients. Use Value: Prevents sensor IC latch-up or permanent damage while maintaining <1 µA leakage at 18 V nominal rail. | Use Scenario: Safeguarding CANH/CANL differential pair against ESD and coupled surges in vehicle infotainment and gateway ECUs. IC Role / Device Role / Timing Role: Low-capacitance TVS placed across CAN bus lines to clamp common-mode transients without distorting 1 Mbps signaling. Use Value: Clamps to 32.4 V within nanoseconds, preserving signal integrity and meeting ISO 10605 ±30 kV contact discharge requirements. |
| Industrial PLC I/O Protection | Consumer Power Adapter Input Stage |
Use Scenario: Shielding digital input channels on programmable logic controllers from field-wiring induced surges in factory automation. IC Role / Device Role / Timing Role: Standoff-rated TVS connected between input terminal and ground to divert 1500 W transients from optocoupler inputs. Use Value: Enables compliance with IEC 61000-4-5 surge immunity (2 kV line-to-ground) without derating or parallel devices. | Use Scenario: Protecting AC-DC adapter primary-side rectifier outputs from mains-borne surges and switching noise. IC Role / Device Role / Timing Role: Bidirectional clamp across bulk capacitor terminals to suppress ringing and transient overvoltage during MOSFET turn-off. Use Value: Withstands 200 A IFSM (unidirectional test condition), providing margin against repetitive line-switching events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18CA | Same VWM (18 V) and PPPM (1500 W), but SMA (DO-214AC) package; higher RθJA (110 °C/W) and no AEC-Q101 qualification. | Not suitable for automotive under-hood use; limited to commercial/industrial ambient temperatures ≤125 °C. | Select SMAJ18CA only for cost-sensitive non-automotive designs where board space allows larger SMA footprint. |
| 1.5KE18CA | Through-hole DO-204AB package; same VWM and PPPM, but higher clamping voltage (35.5 V) and no MSL or AEC-Q101 rating. | Requires wave soldering; incompatible with automated SMT lines and high-reliability automotive production. | Choose 1.5KE18CA only for legacy through-hole prototyping or repair where rework tolerance outweighs performance and qualification needs. |
Compared with SMAJ18CA and 1.5KE18CA, the SMCG18CAHE3/57T delivers superior thermal performance in SMT assembly, guaranteed automotive qualification, and tighter clamping-making it the preferred choice for new automotive and industrial designs requiring zero-compromise surge resilience.
Availability
SMCG18CAHE3/57T is available at Aetrix Electronics and suitable for automotive sensor interfaces, CAN bus protection, industrial PLC I/O, and consumer power adapter designs requiring stable component supply, AEC-Q101 compliance, and consistent 1500 W surge handling.
Supply support for SMCG18CAHE3/57T 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, precision, and automotive-grade validation.
The SMCG series was engineered specifically for high-power, surface-mount transient suppression in space-constrained automotive and industrial systems-balancing low clamping voltage, fast response, and robust thermal performance in the compact DO-215AB outline.
FAQ
What is the clamping voltage of the SMCG18CAHE3/57T under a standard 10/1000 µs surge?
The SMCG18CAHE3/57T clamps to a maximum of 32.4 V when subjected to its rated peak pulse current of 46.3 A (10/1000 µs waveform). This value is measured per ANSI/IEEE C62.35 and confirmed in the Vishay datasheet revision 09-Jan-2024, ensuring predictable overvoltage limiting for downstream 3.3 V or 5 V ICs. The SMCG18CAHE3/57T achieves this with minimal overshoot due to its low incremental surge resistance.
Is the SMCG18CAHE3/57T suitable for automotive applications?
Yes, the SMCG18CAHE3/57T is AEC-Q101 qualified and explicitly rated for automotive use-including engine control units, body electronics, and ADAS sensor interfaces. Its construction includes glass-passivated junctions, MSL Level 1 reflow compatibility, and operation from –55 °C to +150 °C. The SMCG18CAHE3/57T also carries Vishay's material categorization per doc#99912, confirming RoHS compliance and automotive process controls.
Does the SMCG18CAHE3/57T have polarity markings?
No, the SMCG18CAHE3/57T is a bidirectional TVS diode and carries no polarity marking on the case-consistent with Vishay's specification that "no marking on bidirectional types." Its symmetrical electrical characteristics mean either terminal functions identically as anode or cathode depending on instantaneous voltage polarity. This simplifies layout and eliminates orientation errors during automated placement.
What is the thermal resistance of the SMCG18CAHE3/57T, and how does it affect PCB layout?
The SMCG18CAHE3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. To maintain TJ ≤ 150 °C under full 6.5 W steady-state dissipation, designers must provide adequate copper area and avoid thermal bottlenecks. The SMCG18CAHE3/57T benefits from direct thermal coupling to inner-layer planes via thermal vias under the pads.
How does the SMCG18CAHE3/57T compare to unidirectional variants like SMCG18AHE3/57T?
The SMCG18CAHE3/57T differs from unidirectional SMCG18AHE3/57T solely in polarity behavior: it clamps symmetrically for both positive and negative transients, whereas SMCG18AHE3/57T only protects against reverse-polarity surges. Both share identical VWM (18 V), PPPM (1500 W), and package (SMCG/DO-215AB), but SMCG18AHE3/57T includes a cathode band and supports forward conduction (IFSM = 200 A). The SMCG18CAHE3/57T is selected when bidirectional protection is required-e.g., on AC-coupled or differential lines.
SMCG18CAHE3/57T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-215AB, SMC Gull Wing
- 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 (SMCG)
SMCG18CAHE3/57T FAQ
1.How can I place an order for SMCG18CAHE3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG18CAHE3/57T 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 SMCG18CAHE3/57T reliable?
The price and inventory of SMCG18CAHE3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCG18CAHE3/57T is usually 5 days.
3.What payment methods are accepted for SMCG18CAHE3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG18CAHE3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG18CAHE3/57T?
SMCG18CAHE3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG18CAHE3/57T 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 SMCG18CAHE3/57T?
For technical support, including SMCG18CAHE3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG18CAHE3/57T requirements.
6.How does Aetrix verify that SMCG18CAHE3/57T is sourced from the original manufacturer or authorized distributors?
All SMCG18CAHE3/57T 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 SMCG18CAHE3/57T meets industry standards.
7.What is the process for return or replacement of SMCG18CAHE3/57T?
All SMCG18CAHE3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCG18CAHE3/57T, 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 SMCG18CAHE3/57T part is unused and in its original packaging.
Return procedure for SMCG18CAHE3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCG18CAHE3/57T Tags
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