My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMCG18CA-M3/9AT
- Part No.:
- SMCG18CA-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG18CA-M3/9AT.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,983
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCG18CA-M3/9AT from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in the SMCG (DO-215AB) package, designed for robust overvoltage protection of signal and power 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), clamping voltage of 29.2 V at 51.4 A, and AEC-Q101 qualification for automotive use.
For engineers reviewing the SMCG18CA-M3/9AT datasheet, SMCG18CA-M3/9AT pinout, SMCG18CA-M3/9AT application, or SMCG18CA-M3/9AT equivalent, this device is selected for high-energy surge immunity in automotive sensor interfaces, industrial I/O protection, and DC power rail clamping where low clamping ratio, halogen-free compliance, and MSL Level 1 reflow capability are required.
Technical Context
The SMCG18CA-M3/9AT operates as a bidirectional avalanche diode, symmetrically clamping voltage transients above ±20.0 V in both polarities. Its glass-passivated junction ensures stable breakdown characteristics, while its low incremental surge resistance enables effective energy diversion during 10/1000 µs surges up to 1500 W.
Designed for surface-mount automated placement, it uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and meets JESD 201 Class 2 whisker resistance. The DO-215AB package provides thermal resistance of 75 °C/W (junction-to-ambient) and supports operation from –55 °C to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 20.0 V / 22.1 V at 1 mA - Ensures consistent breakdown threshold across production units |
| VC @ IPPM | 29.2 V at 51.4 A - Clamping voltage under full 1500 W surge, defining protected circuit's max stress level |
| PPPM | 1500 W - Peak transient power handling per 10/1000 µs waveform, critical for ISO 7637-2/IEC 61000-4-5 compliance |
| ID @ VWM | 1.0 µA - Ultra-low leakage preserves signal integrity and battery life in always-on circuits |
| TJ max | +150 °C - Enables deployment in under-hood automotive environments and high-temperature industrial enclosures |
| Qualification | AEC-Q101 qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD |
Pinout & Package
Package: SMCG (DO-215AB) - Low-profile, surface-mount gull-wing package with 2 terminals; meets UL 94 V-0, RoHS-compliant, halogen-free (M3 suffix), MSL Level 1 (260 °C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry (bidirectional) | Terminal accepts surge current in either polarity; no polarity marking on bidirectional devices |
| Cathode | Current exit (bidirectional) | Terminal conducts surge current to ground or return path; symmetrical conduction with Anode |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| AEC-Q101 qualification | Validates reliability for automotive applications including engine control, ADAS sensors, and infotainment power rails |
| Halogen-free (M3) | Meets environmental compliance requirements for green manufacturing and end-of-life disposal |
| Low clamping ratio (VC/VBR ≈ 1.4) | Minimizes voltage overshoot during transients, protecting downstream ICs with tight absolute maximum ratings |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow profiles without baking, reducing assembly cost and risk |
Applications
| Automotive Sensor Protection | Industrial PLC Analog Input |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and MEMS pressure/temperature sensors from load dump and inductive switching spikes in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS clamping element placed at connector interface to shunt surge energy before it reaches signal conditioning circuitry. Use Value: With 29.2 V clamping at 51.4 A and AEC-Q101 qualification, SMCG18CA-M3/9AT ensures functional safety compliance and long-term reliability in harsh automotive environments. | Use Scenario: Safeguarding 4–20 mA current loop inputs and ±10 V analog inputs in programmable logic controllers against field wiring surges and ESD events. IC Role / Device Role / Timing Role: Primary front-end transient suppressor mounted directly at terminal block or connector to limit voltage seen by precision op-amps and ADCs. Use Value: 1.0 µA leakage at 18 V VWM prevents measurement drift, while 1500 W PPPM handles repetitive 1 kV/500 A surges per IEC 61000-4-5. |
| DC Power Rail Clamping | USB Type-C Port Protection |
Use Scenario: Clamping 12 V/24 V DC power distribution networks in factory automation equipment exposed to relay coil flyback and motor commutation noise. IC Role / Device Role / Timing Role: Parallel-connected TVS across input rail to clamp fast-rising transients (<1 ns rise time) before they propagate to DC-DC converters and microcontrollers. Use Value: 75 °C/W RθJA allows direct PCB copper pad heatsinking, enabling sustained surge handling without derating in compact layouts. | Use Scenario: Protecting USB Type-C CC, SBU, and VCONN lines from ESD (±15 kV contact) and cable discharge events in docking stations and peripherals. IC Role / Device Role / Timing Role: Bidirectional TVS placed adjacent to connector pins to clamp both positive and negative transients on differential and auxiliary lines. Use Value: Symmetric 20.0–22.1 V VBR and 29.2 V VC ensure balanced protection without signal distortion, supporting USB IF compliance testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18CA-E3/57T | Same VWM (18 V), lower PPPM (400 W), SMA (DO-214AC) package, non-AEC-Q101 | Lower surge capacity; suitable only for consumer-grade or non-automotive industrial use | Select when cost sensitivity outweighs surge margin and automotive qualification is unnecessary |
| SMCJ18CA-M3 | Same VWM (18 V), higher PPPM (1500 W), SMC (DO-214AB) package, AEC-Q101 qualified | Larger footprint (7.11 mm × 6.22 mm vs. 6.60 mm × 5.59 mm), higher thermal mass | Choose when board space permits larger package and enhanced thermal performance is prioritized over miniaturization |
Compared with SMAJ18CA-E3/57T and SMCJ18CA-M3, the SMCG18CA-M3/9AT delivers identical electrical protection performance in a smaller DO-215AB footprint with halogen-free compliance, making it optimal for space-constrained automotive modules requiring AEC-Q101 validation and MSL Level 1 process compatibility.
Availability
SMCG18CA-M3/9AT is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC analog inputs, and DC power rail clamping requiring stable component supply, halogen-free compliance, and AEC-Q101 qualification.
Supply support for SMCG18CA-M3/9AT 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 SMCG series is part of Vishay's TRANSZORB® TVS platform, engineered for high-energy transient suppression in automotive, industrial, and telecom infrastructure where compact size, AEC-Q101 compliance, and precise clamping performance are mandatory.
FAQ
What is the clamping voltage of the SMCG18CA-M3/9AT under maximum surge conditions?
The SMCG18CA-M3/9AT has a maximum clamping voltage (VC) of 29.2 V at 51.4 A, measured under the standardized 10/1000 µs double-exponential surge waveform. This value defines the upper voltage limit imposed on protected circuitry during a full 1500 W transient event and is confirmed in the Vishay datasheet Document Number 88457, page 2. The SMCG18CA-M3/9AT maintains this clamping performance across its operating temperature range.
Is the SMCG18CA-M3/9AT suitable for automotive applications?
Yes, the SMCG18CA-M3/9AT is AEC-Q101 qualified, meaning it has passed rigorous stress tests including temperature cycling, high-temperature reverse bias, and ESD, specifically for automotive electronic systems. Its DO-215AB package, halogen-free (M3) construction, and operation up to +150 °C make it appropriate for under-hood and cabin-mounted modules. The SMCG18CA-M3/9AT is explicitly listed in Vishay's AEC-Q101 qualified product table.
What does the "CA" suffix indicate in SMCG18CA-M3/9AT?
The "CA" suffix denotes a bidirectional configuration, meaning the SMCG18CA-M3/9AT provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional variants (e.g., SMCG18A), it has no polarity marking and functions identically in either orientation. This is confirmed in the Vishay document's "DEVICES FOR BIDIRECTION APPLICATIONS" section and applies to all electrical characteristics listed for the CA family.
How does the SMCG18CA-M3/9AT differ from the SMAJ18CA in terms of package and performance?
The SMCG18CA-M3/9AT uses the smaller DO-215AB (SMCG) package (6.60 mm × 5.59 mm), while the SMAJ18CA uses DO-214AC (SMA) (4.57 mm × 2.79 mm). Although both have 18 V VWM, the SMCG18CA-M3/9AT delivers 1500 W PPPM versus 400 W for SMAJ18CA, and is AEC-Q101 qualified whereas SMAJ18CA is not. The SMCG18CA-M3/9AT also features halogen-free (M3) construction and MSL Level 1 rating.
What is the maximum leakage current of the SMCG18CA-M3/9AT at its standoff voltage?
The SMCG18CA-M3/9AT exhibits a maximum reverse leakage current (ID) of 1.0 µA at its 18 V standoff voltage (VWM), measured at TA = 25 °C. This ultra-low leakage minimizes power loss in battery-powered or high-impedance sensing circuits and is specified in the "ELECTRICAL CHARACTERISTICS" table on page 2 of Vishay Document Number 88457. The SMCG18CA-M3/9AT maintains this specification across its full operating temperature range.
SMCG18CA-M3/9AT 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCG)
SMCG18CA-M3/9AT FAQ
1.How can I place an order for SMCG18CA-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG18CA-M3/9AT 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 SMCG18CA-M3/9AT reliable?
The price and inventory of SMCG18CA-M3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCG18CA-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCG18CA-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG18CA-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG18CA-M3/9AT?
SMCG18CA-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG18CA-M3/9AT 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 SMCG18CA-M3/9AT?
For technical support, including SMCG18CA-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG18CA-M3/9AT requirements.
6.How does Aetrix verify that SMCG18CA-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCG18CA-M3/9AT 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 SMCG18CA-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCG18CA-M3/9AT?
All SMCG18CA-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCG18CA-M3/9AT, 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 SMCG18CA-M3/9AT part is unused and in its original packaging.
Return procedure for SMCG18CA-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCG18CA-M3/9AT Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
