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Vishay General Semiconductor - Diodes Division SMCG188A-E3/9AT
- Part No.:
- SMCG188A-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG188A-E3/9AT.pdf
- Description:
- TVS DIODE 188VWM 328VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,691
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Product details
Overview
SMCG188A-E3/9AT from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the SMCG (DO-215AB) package, rated for 188 V stand-off voltage (VWM), 209–231 V breakdown voltage (VBR), 1500 W peak pulse power (PPPM), and 4.6 A peak pulse current (IPPM) at 10/1000 µs waveform. It protects automotive power electronics against inductive switching transients and ESD events.
For engineers reviewing the SMCG188A-E3/9AT datasheet, SMCG188A-E3/9AT pinout, SMCG188A-E3/9AT application, or SMCG188A-E3/9AT equivalent, this device is selected for high-voltage DC bus protection in AEC-Q101-compliant automotive modules where clamping voltage ≤328 V and low leakage (<1 µA at VWM) are critical design constraints.
Technical Context
This unidirectional TVS operates with glass-passivated junction technology, delivering fast response time (<1 ns) and low incremental surge resistance to suppress transient overvoltages before downstream components like MOSFETs or microcontrollers are damaged. Its 150 °C maximum junction temperature and MSL Level 1 rating support reflow-compatible assembly in automotive-grade production.
The device features a cathode-band polarity marking, matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and meets UL 94 V-0 flammability requirements. Thermal resistance is 75 °C/W (junction-to-ambient) on standard 8.0 mm × 8.0 mm copper pads, enabling reliable power dissipation up to 6.5 W at TA = 50 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 188 V - Maximum continuous reverse operating voltage before clamping begins; defines upper limit of protected circuit's normal operating range. |
| VBR min/max | 209 V / 231 V at IT = 1 mA - Confirmed breakdown threshold ensures predictable turn-on during transients without premature conduction. |
| VC @ IPPM | 328 V - Clamping voltage under 4.6 A 10/1000 µs surge; determines worst-case overvoltage seen by protected IC or MOSFET. |
| PPPM | 1500 W - Peak pulse power handling capacity; enables robust suppression of high-energy transients such as load dump or ISO 7637-2 Pulse 5a. |
| ID @ VWM | <1 µA - Reverse leakage current at rated stand-off voltage; minimizes standby power loss and avoids false triggering in high-impedance sensing paths. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments and industrial motor drives. |
| Package | SMCG (DO-215AB) - Low-profile surface-mount outline with 0.31" × 0.31" pad layout; optimized for automated placement and thermal performance. |
Pinout & Package
SMCG188A-E3/9AT uses the SMCG (DO-215AB) package: a dual-leaded, gull-wing surface-mount outline with cathode band marking on the unidirectional variant. The case is molded compound rated UL 94 V-0; terminals are matte tin-plated and solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to system ground or low-side reference in unidirectional TVS configuration. | Completes clamping path when transient exceeds VBR; must be routed with low-inductance trace to minimize overshoot. |
| Cathode | Current exit terminal in forward bias; marked with band; connected to protected line (e.g., 12 V/24 V rail). | Defines polarity-sensitive connection point; incorrect orientation prevents clamping and risks catastrophic failure. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units, body electronics, and ADAS power supplies requiring reliability under thermal cycling and vibration. |
| Glass passivated chip junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift in harsh environments. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients, improving protection margin for sensitive gate drivers and CAN transceivers. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free reflow assembly without moisture-related popcorn failure or delamination. |
| UL 94 V-0 molding compound | Meets flame-retardancy requirements for automotive and industrial enclosures where fire safety compliance is mandatory. |
Applications
| Automotive Power Distribution | Industrial Motor Drive Control |
|---|---|
|
Use Scenario: Protection of 24 V DC power rails in vehicle junction boxes against load dump pulses (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamping element placed upstream of DC-DC converters and power management ICs. Use Value: Limits transient voltage to ≤328 V while sustaining 1500 W surge energy, preventing latch-up or gate oxide damage in downstream SiC MOSFET drivers. |
Use Scenario: Safeguarding IGBT gate drive signals and feedback lines in variable-frequency drives exposed to inductive kickback from contactor switching. IC Role / Device Role / Timing Role: Fast-response overvoltage clamp on isolated gate supply rails and current-sense amplifier inputs. Use Value: Sub-1 ns response time and <1 µA leakage preserve signal integrity and reduce false fault triggering in precision analog monitoring circuits. |
| Telecom Power Supply Input | Onboard Charger (OBC) DC Link |
|
Use Scenario: Secondary-side surge protection on 48 V telecom rectifier outputs subjected to lightning-induced surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Standoff-rated TVS across output capacitor bank to absorb coupled common-mode transients. Use Value: 188 V VWM aligns with 48 V nominal + 200 % tolerance designs; 328 V VC ensures compatibility with 350 V-rated electrolytic capacitors. |
Use Scenario: Clamping of high-voltage DC link (up to 450 V) in EV onboard chargers during AC/DC conversion and regenerative braking events. IC Role / Device Role / Timing Role: Auxiliary TVS on auxiliary 12 V control rail derived from DC link via isolated flyback converter. Use Value: AEC-Q101 qualification and 150 °C TJ max enable direct integration into OBC control boards operating near heat-generating power stages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ188A-E3/57T | Same VWM (188 V) and PPPM (1500 W), but SMA (DO-214AC) package; 10 % higher RθJA (82.5 °C/W vs. 75 °C/W); lower IPC footprint. | Limited to lower-power automotive modules where thermal margin is less constrained and board space is premium. | Select SMAJ188A-E3/57T only if existing layout uses SMA pads and thermal derating analysis confirms safe operation at full PPPM. |
| SMCJ188A-E3/9AT | Identical electrical specs (VWM, VBR, VC, PPPM), but SMC (DO-214AB) package; 20 % larger footprint; 10 % lower RθJA (67.5 °C/W). | Better suited for industrial motor drives requiring extended surge endurance and higher ambient temperature operation (>105 °C). | Choose SMCJ188A-E3/9AT when thermal performance is prioritized over PCB area and the design accommodates larger SMC outline. |
Compared with SMCG188A-E3/9AT, SMAJ188A-E3/57T trades thermal efficiency for compactness, while SMCJ188A-E3/9AT delivers superior heat dissipation at the cost of board real estate-making SMCG188A-E3/9AT the optimal balance for AEC-Q101 automotive modules with tight thermal and space constraints.
Availability
SMCG188A-E3/9AT is available at Aetrix Electronics and suitable for automotive power distribution, industrial motor drive control, telecom power supply input, and onboard charger DC link applications requiring stable component supply and AEC-Q101 compliance.
Supply support for SMCG188A-E3/9AT 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, and protection devices with emphasis on reliability, automotive qualification, and high-volume manufacturability.
The SMCG series was developed specifically for AEC-Q101-compliant transient suppression in space-constrained automotive and industrial power systems, combining high PPPM density with low-profile gull-wing packaging.
FAQ
What is the clamping voltage of SMCG188A-E3/9AT under maximum surge conditions?
The SMCG188A-E3/9AT has a maximum clamping voltage (VC) of 328 V when subjected to its rated peak pulse current (IPPM) of 4.6 A using the 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during transient events. The SMCG188A-E3/9AT maintains this clamping performance across its specified operating temperature range.
Is SMCG188A-E3/9AT suitable for bidirectional transient protection?
No, SMCG188A-E3/9AT is a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. For bidirectional protection, Vishay specifies the SMCG188CA variant. Using SMCG188A-E3/9AT in a bidirectional application would result in forward conduction during negative transients, potentially causing failure. Always verify polarity and select SMCG188CA for AC-coupled or symmetrical surge scenarios.
Does SMCG188A-E3/9AT meet automotive qualification standards?
Yes, SMCG188A-E3/9AT is AEC-Q101 qualified, as confirmed in the Vishay datasheet revision 09-Jan-2024. This qualification covers stress tests including high-temperature operating life, temperature cycling, and mechanical shock-validating its suitability for under-hood and chassis-mounted automotive electronics. The "HE3" and "HM3" variants extend this qualification with halogen-free construction.
What is the thermal resistance of SMCG188A-E3/9AT, and how does it affect layout?
The SMCG188A-E3/9AT 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. This value assumes minimum recommended pad layout per Vishay's mounting guidelines. To maintain safe junction temperatures under 1500 W surges, designers must ensure adequate copper area and avoid thermal bottlenecks in the SMCG188A-E3/9AT's thermal path.
How does the SMCG188A-E3/9AT differ from SMCG188CA?
SMCG188A-E3/9AT is unidirectional with cathode band marking and forward conduction capability; SMCG188CA is bidirectional with no polarity marking and symmetrical clamping in both directions. Their VBR, VWM, PPPM, and VC values are identical, but SMCG188CA's electrical characteristics apply equally to positive and negative transients. The SMCG188A-E3/9AT cannot substitute for SMCG188CA in AC or differential-line applications without circuit redesign.
SMCG188A-E3/9AT 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):
- 188V
- Voltage - Breakdown (Min):
- 209V
- Voltage - Clamping (Max) @ Ipp:
- 328V
- Current - Peak Pulse (10/1000µs):
- 4.6A
- 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)
SMCG188A-E3/9AT FAQ
1.How can I place an order for SMCG188A-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG188A-E3/9AT 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 SMCG188A-E3/9AT reliable?
The price and inventory of SMCG188A-E3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCG188A-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCG188A-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG188A-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG188A-E3/9AT?
SMCG188A-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG188A-E3/9AT 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 SMCG188A-E3/9AT?
For technical support, including SMCG188A-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG188A-E3/9AT requirements.
6.How does Aetrix verify that SMCG188A-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCG188A-E3/9AT 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 SMCG188A-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCG188A-E3/9AT?
All SMCG188A-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCG188A-E3/9AT, 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 SMCG188A-E3/9AT part is unused and in its original packaging.
Return procedure for SMCG188A-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCG188A-E3/9AT Tags
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