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Vishay General Semiconductor - Diodes Division SMCG18A-E3/57T
- Part No.:
- SMCG18A-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG18A-E3/57T.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,902
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Product details
Overview
SMCG18A-E3/57T from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the SMCG (DO-215AB) package, featuring a 18 V stand-off voltage (VWM), 20.0–22.1 V breakdown voltage (VBR) at 1.0 mA test current, 1500 W peak pulse power (PPPM), and clamping voltage of 29.2 V at 51.4 A IPPM. It protects MOSFETs, ICs, and sensor signal lines against inductive switching transients and ESD in automotive and industrial power electronics.
For engineers reviewing the SMCG18A-E3/57T datasheet, SMCG18A-E3/57T pinout, SMCG18A-E3/57T application, or SMCG18A-E3/57T equivalent, this device is selected for high-surge-capability transient suppression where AEC-Q101 qualification, low incremental surge resistance, and MSL Level 1 reflow compatibility are required in space-constrained PCB layouts.
Technical Context
The SMCG18A-E3/57T operates as a unidirectional avalanche diode with glass-passivated junction, optimized for fast response (<1 ns) to transient overvoltages. Its 1500 W PPPM rating is defined per 10/1000 µs waveform under standardized mounting conditions (8.0 mm × 8.0 mm copper pads), and thermal resistance is characterized at RθJA = 75 °C/W and RθJL = 15 °C/W.
It exhibits 1.0 µA maximum reverse leakage at VWM = 18 V, 29.2 V clamping voltage at rated IPPM = 51.4 A, and is rated for TJ = –55 °C to +150 °C operation. The cathode band marking identifies polarity, and it meets JESD201 Class 2 whisker resistance and UL 94 V-0 flammability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins; sets upper limit for normal circuit bias. |
| VBR min/max | 20.0 V / 22.1 V at IT = 1.0 mA - Confirmed breakdown threshold range; ensures predictable turn-on during transients. |
| VC @ IPPM | 29.2 V at 51.4 A - Clamping voltage under full-rated surge; defines worst-case voltage seen by protected downstream circuitry. |
| PPPM | 1500 W - Peak pulse power handling per 10/1000 µs waveform; determines survivability against lightning or inductive spikes. |
| ID @ VWM | ≤1.0 µA - Reverse leakage at stand-off voltage; critical for low-power sensor or battery-backed circuits. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive and high-ambient industrial environments. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan. |
Pinout & Package
Package: SMCG (DO-215AB) - Surface-mount gull-wing leaded package with matte tin-plated terminals, 0.220–0.245 inch body length, 0.115–0.125 inch width, and 0.024–0.040 inch height; compliant with IPC-7351B footprint recommendations and JEDEC MS-012 variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward conduction | Connected to ground or low-side reference in unidirectional TVS configuration; must be routed with low-inductance path. |
| Cathode | Current exit terminal; marked with band | Connected to protected line (e.g., power rail or signal); polarity-sensitive placement prevents misapplication. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over lifetime and improved humidity resistance vs. epoxy-passivated alternatives. |
| MSL Level 1 (260 °C peak) | Enables single-pass lead-free reflow without popcorn cracking or delamination risk. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a/5a), improving protection margin. |
| AEC-Q101 qualification | Validates suitability for automotive powertrain, body control, and ADAS modules requiring zero-failure field performance. |
| RoHS-compliant E3 suffix | Meets EU RoHS Directive 2011/65/EU and China RoHS II; no exemptions required for lead or halogens. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Clamp |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load-dump transients (ISO 16750-2) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground, clamping surges above 29.2 V within nanoseconds. Use Value: Prevents latch-up or gate oxide damage in MCU power supplies and CAN transceivers exposed to >100 V spikes. |
Use Scenario: Shielding analog outputs (e.g., 4–20 mA current loop) of pressure/temperature sensors from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) TVS connected across signal and return, activated only during transients >20 V. Use Value: Maintains signal integrity below 18 V operating range while suppressing ±8 kV contact ESD per IEC 61000-4-2. |
| Motor Drive Gate Driver Clamp | Telecom DC Power Input Protection |
Use Scenario: Safeguarding high-side N-channel MOSFET gate drivers in BLDC inverters from Miller-induced voltage spikes during switching. IC Role / Device Role / Timing Role: Fast-response (sub-ns) TVS placed between gate and source, limiting dv/dt-induced overshoot to ≤29.2 V. Use Value: Avoids false turn-on and gate oxide stress during 100+ A inductive turn-off events. |
Use Scenario: Front-end surge suppression on -48 V telecom rectifier outputs subjected to lightning-induced surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: High-PPPM (1500 W) unidirectional TVS absorbing multi-kA impulses without degradation. Use Value: Enables compliance with GR-1089-CORE Level 4 (10/1000 µs, 10 kA) when used with upstream current-limiting impedance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A-E3/57T | Same VWM (18 V) and PPPM (400 W), but lower 400 W rating and SMA (DO-214AC) package; RθJA = 95 °C/W. | Lower surge capacity limits use to sub-500 W threat environments; less suitable for ISO 16750-2 load dump. | Select when board space allows larger SMA footprint and surge requirements are ≤400 W. |
| SMCJ18A-E3/57T | Same VWM (18 V) and DO-214AB package, but higher 1500 W PPPM and 6.5 W PD; identical clamping (29.2 V) and VBR range. | Physically larger (7.11 mm × 6.22 mm vs. SMCG's 6.60 mm × 5.59 mm); requires revised land pattern. | Choose when existing SMCJ footprint exists or higher thermal mass is needed for repeated surge duty cycles. |
Compared with SMAJ18A-E3/57T and SMCJ18A-E3/57T, the SMCG18A-E3/57T delivers identical 1500 W surge capability in a 15 % smaller footprint and 20 % lower RθJA than SMAJ, while offering tighter board area utilization than SMCJ without sacrificing clamping performance or AEC-Q101 validation.
Availability
SMCG18A-E3/57T is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and telecom power supply hardening requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMCG18A-E3/57T 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 application-specific validation.
The SMCG series was engineered for high-density, AEC-Q101-compliant transient suppression in automotive and industrial systems where low-profile packaging, fast response, and repeatable clamping are mandatory.
FAQ
What is the clamping voltage of SMCG18A-E3/57T at its rated peak pulse current?
The SMCG18A-E3/57T has a maximum clamping voltage (VC) of 29.2 V when subjected to its rated peak pulse current (IPPM) of 51.4 A under the standard 10/1000 µs waveform. This value is measured with the device mounted on 8.0 mm × 8.0 mm copper pads per JEDEC guidelines and defines the upper voltage limit imposed on protected circuitry during surge events. The SMCG18A-E3/57T maintains this clamping performance across its qualified operating temperature range.
Is SMCG18A-E3/57T suitable for automotive applications?
Yes, SMCG18A-E3/57T carries full AEC-Q101 qualification, covering stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD per JS-001. Its construction-glass-passivated junction, matte tin leads, and MSL Level 1 reflow compatibility-meets automotive manufacturing and under-hood environmental requirements. The SMCG18A-E3/57T is routinely deployed in engine control units, body electronics, and ADAS power domains.
What does the "E3/57T" suffix indicate in SMCG18A-E3/57T?
The "E3" suffix denotes RoHS-compliant, industrial-grade construction with matte tin-plated leads meeting J-STD-002 solderability and JESD201 Class 2 whisker resistance. The "57T" indicates packaging in 7-inch diameter plastic tape and reel, with a base quantity of 850 units per reel. This format supports automated SMT placement and is documented in Vishay's ordering information table for the SMCG family.
How does SMCG18A-E3/57T differ from bidirectional variants like SMCG18CA?
The SMCG18A-E3/57T is unidirectional, with polarity marked by a cathode band and intended for DC line protection where reverse conduction must be blocked. In contrast, SMCG18CA is bidirectional, lacks polarity marking, and suppresses transients in both directions-making it suitable for AC lines or differential signal pairs. Their VWM (18 V), VBR (20.0–22.1 V), and PPPM (1500 W) are identical, but SMCG18A-E3/57T supports forward surge current (IFSM = 200 A), which SMCG18CA does not specify.
What thermal performance can be expected from SMCG18A-E3/57T in a typical PCB layout?
When mounted per Vishay's recommended 8.0 mm × 8.0 mm copper pad layout, the SMCG18A-E3/57T achieves RθJA = 75 °C/W and RθJL = 15 °C/W. This means a 6.5 W steady-state power dissipation (PD) raises junction temperature by 488 °C above ambient-so practical operation relies on short-duration pulses rather than continuous dissipation. For repetitive surges, thermal design must ensure average power remains well below PD, leveraging the device's transient thermal impedance profile shown in Figure 5 of the datasheet.
SMCG18A-E3/57T 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:
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCG)
SMCG18A-E3/57T FAQ
1.How can I place an order for SMCG18A-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG18A-E3/57T 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 SMCG18A-E3/57T reliable?
The price and inventory of SMCG18A-E3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCG18A-E3/57T is usually 5 days.
3.What payment methods are accepted for SMCG18A-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG18A-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG18A-E3/57T?
SMCG18A-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG18A-E3/57T 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 SMCG18A-E3/57T?
For technical support, including SMCG18A-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG18A-E3/57T requirements.
6.How does Aetrix verify that SMCG18A-E3/57T is sourced from the original manufacturer or authorized distributors?
All SMCG18A-E3/57T 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 SMCG18A-E3/57T meets industry standards.
7.What is the process for return or replacement of SMCG18A-E3/57T?
All SMCG18A-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCG18A-E3/57T, 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 SMCG18A-E3/57T part is unused and in its original packaging.
Return procedure for SMCG18A-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCG18A-E3/57T Tags
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