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Vishay General Semiconductor - Diodes Division SMCG18AHE3/9AT
- Part No.:
- SMCG18AHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG18AHE3/9AT.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,267
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Product details
Overview
SMCG18AHE3/9AT from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in the SMCG (DO-215AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 18 V stand-off voltage (VWM), 20.0–22.1 V breakdown voltage (VBR) at 1 mA, 1500 W peak pulse power (PPPM), 51.4 A peak pulse current (IPPM), and clamps to 29.2 V at IPPM - ideal for automotive power line and ECU I/O protection.
For engineers reviewing the SMCG18AHE3/9AT datasheet, SMCG18AHE3/9AT pinout, SMCG18AHE3/9AT application, or SMCG18AHE3/9AT equivalent, key selection criteria include its AEC-Q101 qualification, 150 °C max junction temperature, low incremental surge resistance, bidirectional-capable variant compatibility, and RoHS-compliant HE3 suffix indicating automotive-grade reliability and tin-plated matte leads.
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, responding within picoseconds to transients such as load dump, ISO 7637-2 pulses, and ESD events. Its glass-passivated junction ensures stable VBR tolerance and long-term reliability under repetitive surge stress.
The SMCG18AHE3/9AT is rated for 1500 W peak pulse power using the standardized 10/1000 μs waveform, with thermal resistance RθJA = 75 °C/W and RθJL = 15 °C/W - enabling effective heat dissipation on standard 8.0 mm × 8.0 mm copper pads per terminal without heatsinking.
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 IT = 1 mA - tight breakdown window ensures predictable turn-on threshold |
| VC @ IPPM | 29.2 V - clamping voltage during 51.4 A 10/1000 μs surge, limiting downstream voltage stress |
| PPPM | 1500 W - peak transient energy absorption capability under standardized surge waveform |
| TJ max | +150 °C - supports operation in under-hood automotive environments |
| Package | SMCG (DO-215AB) - surface-mount gull-wing package with MSL Level 1 rating and 260 °C reflow compatibility |
| AEC-Q101 | Qualified - validated for automotive electronic systems per stress test requirements |
Pinout & Package
SMCG18AHE3/9AT uses the SMCG (DO-215AB) surface-mount package: gull-wing leads, 0.310" × 0.400" footprint (7.87 mm × 10.16 mm), 0.245" lead span (6.22 mm), matte tin-plated terminals solderable per J-STD-002 and JESD 22-B102. Polarity is marked by a cathode band on the body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to ground or low-impedance return path | Provides low-impedance discharge path for negative transients when used in unidirectional configuration |
| Cathode | Current exit point in forward bias; connected to protected line (e.g., 12 V rail or signal) | Clamps positive transients to VWM + VC margin; band-marked end identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and body electronics |
| Glass-passivated junction | Ensures stable electrical parameters and long-term reliability under thermal cycling and humidity |
| MSL Level 1 rating | Allows unlimited floor life and compatibility with standard 260 °C Pb-free reflow profiles |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 16750-2 pulse 5a) |
| 1500 W 10/1000 μs rating | Supports high-energy suppression in 12 V and 24 V vehicle power networks |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply rails in engine control modules against load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between battery rail and DC/DC input stage. Use Value: Limits transient voltage to ≤29.2 V, preventing damage to downstream regulators and microcontrollers rated for 36 V absolute max. | Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Low-capacitance TVS on differential signal lines exposed to relay switching noise. Use Value: Clamps EFT bursts up to 4 kV (IEC 61000-4-4) while maintaining signal integrity due to fast response and minimal leakage (<1 μA at 18 V). |
| Telecom Power Feeding Protection | Consumer Device USB Port Protection |
Use Scenario: Shielding PoE-powered equipment front-end circuits from induced surges on Ethernet cables. IC Role / Device Role / Timing Role: Primary-level TVS on 48 V DC feed line prior to isolation and regulation stages. Use Value: Absorbs 1500 W surges without degradation, meeting GR-1089-CORE telecom immunity requirements. | Use Scenario: Adding secondary overvoltage protection on USB VBUS lines in portable audio devices. IC Role / Device Role / Timing Role: Backup clamping device after primary polyfuse and ESD diode array. Use Value: Handles sustained overvoltage events (e.g., charger fault) beyond ESD-only protection, extending system robustness. |
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), lower PPPM (400 W), SMA (DO-214AC) package, non-AEC-Q101 | Not qualified for automotive use; suitable only for industrial/commercial PCBs with space constraints | Select if cost-sensitive, non-automotive, and surge energy <400 W suffices |
| SMCJ18AHE3/9AT | Same VWM (18 V), higher PPPM (3000 W), SMC (DO-214AB) package, AEC-Q101 qualified | Larger footprint and higher surge capacity - used where ISO 7637-2 pulse 5b (load dump) requires >1500 W margin | Select when system-level testing demands ≥3000 W clamping headroom or legacy SMC layout reuse is required |
Compared with SMCG18AHE3/9AT, SMAJ18A-E3/57T offers reduced surge capability and no automotive qualification, while SMCJ18AHE3/9AT delivers double the peak power in a larger package - making SMCG18AHE3/9AT the optimal balance of AEC-Q101 compliance, 1500 W performance, and compact DO-215AB footprint for modern automotive ECUs.
Availability
SMCG18AHE3/9AT is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, telecom power feeding, and consumer USB port protection requiring stable component supply across production lifecycles.
Supply support for SMCG18AHE3/9AT 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 validation.
The SMCG series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in harsh environments - especially automotive, industrial, and telecom infrastructure where AEC-Q101 compliance and repeatable clamping performance are mandatory.
FAQ
What is the clamping voltage of SMCG18AHE3/9AT at its rated peak pulse current?
The SMCG18AHE3/9AT clamps to 29.2 V at its specified peak pulse current (IPPM) of 51.4 A under the 10/1000 μs waveform. This value is measured with the device mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal, per JEDEC standards. The clamping voltage directly determines the maximum stress imposed on downstream components during surge events, making it a critical parameter for system-level overvoltage design margins in SMCG18AHE3/9AT implementations.
Is SMCG18AHE3/9AT qualified for automotive applications?
Yes, SMCG18AHE3/9AT is AEC-Q101 qualified, as confirmed by Vishay's official documentation (Document Number: 88457, Revision: 09-Jan-2024). The HE3 suffix explicitly denotes AEC-Q101 qualification, RoHS compliance, and industrial-grade construction. This makes SMCG18AHE3/9AT suitable for deployment in automotive subsystems including body control modules, infotainment power supplies, and ADAS sensor interfaces where reliability under temperature cycling, vibration, and high-energy transients is required.
What does the "9AT" suffix indicate in SMCG18AHE3/9AT?
The "9AT" suffix in SMCG18AHE3/9AT specifies the packaging format: 13-inch diameter plastic tape and reel, containing 3500 units per reel. This differs from the "57T" option (7-inch reel, 850 units). The "HE3" portion confirms RoHS compliance and AEC-Q101 qualification. No electrical or thermal differences exist between HE3/57T and HE3/9AT - only logistics and handling configuration changes. Engineers selecting SMCG18AHE3/9AT should verify their SMT line's reel-handling compatibility with 13" reels.
How does the SMCG (DO-215AB) package compare to SMA (DO-214AC) in thermal performance?
The SMCG (DO-215AB) package used by SMCG18AHE3/9AT provides lower thermal resistance than SMA (DO-214AC): RθJL = 15 °C/W vs. ~25–30 °C/W for SMA, and RθJA = 75 °C/W vs. ~100–120 °C/W. This improvement stems from wider gull-wing leads and optimized internal thermal path geometry. For SMCG18AHE3/9AT, this enables higher sustained power dissipation and better transient recovery in high-temperature ambient conditions - particularly advantageous in under-hood automotive applications where thermal management is critical.
Can SMCG18AHE3/9AT be used in bidirectional configurations?
No - SMCG18AHE3/9AT is a unidirectional TVS diode, indicated by the "A" (not "CA") suffix. Bidirectional variants carry the "CA" suffix (e.g., SMCG18CA). While both share identical VWM and PPPM ratings, unidirectional types like SMCG18AHE3/9AT conduct only in reverse breakdown and block forward current, requiring correct polarity placement. Using SMCG18AHE3/9AT in a bidirectional circuit would result in unintended forward conduction and failure. Always match the suffix to system polarity requirements: "A" for unidirectional, "CA" for bidirectional.
SMCG18AHE3/9AT 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:
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCG)
SMCG18AHE3/9AT FAQ
1.How can I place an order for SMCG18AHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG18AHE3/9AT 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 SMCG18AHE3/9AT reliable?
The price and inventory of SMCG18AHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCG18AHE3/9AT is usually 5 days.
3.What payment methods are accepted for SMCG18AHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG18AHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG18AHE3/9AT?
SMCG18AHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG18AHE3/9AT 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 SMCG18AHE3/9AT?
For technical support, including SMCG18AHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG18AHE3/9AT requirements.
6.How does Aetrix verify that SMCG18AHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCG18AHE3/9AT 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 SMCG18AHE3/9AT meets industry standards.
7.What is the process for return or replacement of SMCG18AHE3/9AT?
All SMCG18AHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCG18AHE3/9AT, 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 SMCG18AHE3/9AT part is unused and in its original packaging.
Return procedure for SMCG18AHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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