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Vishay General Semiconductor - Diodes Division SMCG20CAHE3/57T
- Part No.:
- SMCG20CAHE3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG20CAHE3/57T.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,608
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Product details
Overview
SMCG20CAHE3/57T from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in the SMCG (DO-215AB) surface-mount package, designed for robust overvoltage protection of sensitive electronics. It features a 22.2 V minimum breakdown voltage (VBR), 20 V working peak reverse voltage (VWM), 1500 W peak pulse power (10/1000 µs), clamping voltage of 32.4 V at 46.3 A, and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the SMCG20CAHE3/57T datasheet, SMCG20CAHE3/57T pinout, SMCG20CAHE3/57T application, or SMCG20CAHE3/57T equivalent, this device is selected for high-energy surge suppression in automotive sensor interfaces, industrial I/O lines, and DC power rail protection where low-profile SMT placement, fast response (<1 ns), and bidirectional clamping are required.
Technical Context
The SMCG20CAHE3/57T operates as a bidirectional avalanche diode with symmetrical clamping behavior in both polarities, enabling protection of AC-coupled or floating signal paths without polarity constraints. Its glass-passivated junction ensures stable VBR tolerance (±5% typical), low incremental surge resistance, and repeatable clamping performance under repetitive transients.
Thermally, it exhibits RθJA = 75 °C/W (on 8.0 mm × 8.0 mm copper pads) and supports continuous operation from –55 °C to +150 °C junction temperature. The device meets MSL Level 1 per J-STD-020 and is qualified to AEC-Q101 for automotive under-hood and chassis applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines safe DC/AC bias limit for protected line |
| VBR (min/max) | 22.2 V / 24.5 V at 1 mA - Ensures reliable triggering above system operating voltage with tight tolerance for predictable clamping onset |
| VC @ IPPM | 32.4 V at 46.3 A - Clamped voltage during 10/1000 µs surge; determines maximum stress on downstream ICs |
| PPPM | 1500 W - Peak pulse power handling capacity; enables survival of ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 4 surges |
| IPPM | 46.3 A - Peak surge current capability at rated waveform; defines minimum trace width and PCB layout margin needed |
| TJ max | +150 °C - Maximum junction temperature rating; supports under-hood automotive use without derating at 105 °C ambient |
| AEC-Q101 | Qualified - Validated for automotive reliability including HTOL, TC, UHAST, and ESD per AEC standard; no additional qualification needed for Tier 1 designs |
Pinout & Package
Package: SMCG (DO-215AB) - Low-profile, gull-wing surface-mount package with matte tin-plated leads, UL 94 V-0 molding compound, and 0.220"–0.245" body width. Designed for automated pick-and-place and reflow soldering per J-STD-020 MSL Level 1 (peak 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward conduction (unidirectional mode); reference node for bidirectional symmetry | Terminal 1 - Bidirectional operation means no functional polarity; used as either input or return path depending on transient direction |
| Cathode | Current exit terminal in forward conduction; forms symmetrical junction with Anode in bidirectional configuration | Terminal 2 - Identical electrical role to Anode; device has no marking; orientation does not affect protection function |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and IPPM in both directions - eliminates need for polarity-aware layout in differential or AC signal lines |
| AEC-Q101 qualification | Validated for automotive under-hood environments - enables direct use in ADAS camera modules, body control units, and powertrain sensors without requalification |
| 1500 W peak pulse power | Withstands 10/1000 µs surges up to 46.3 A - meets IEC 61000-4-5 Level 4 (4 kV line-to-line, 2 kV line-to-ground) without external series impedance |
| Low clamping ratio (VC/VBR) | 1.46 (32.4 V / 22.2 V) - minimizes overvoltage overshoot during fast transients, protecting 24 V-rated interface ICs like CAN transceivers |
| MSL Level 1 moisture sensitivity | No dry-pack or baking required before reflow - reduces manufacturing cost and avoids thermal stress on pre-assembled boards |
Applications
| Automotive Sensor Protection | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting LIN bus or analog sensor outputs (e.g., pressure, temperature) in engine control modules from load dump and inductive switching noise. IC Role / Device Role / Timing Role: Bidirectional TVS placed across signal and ground, clamping transients before they reach the sensor signal conditioner or microcontroller ADC input. Use Value: Maintains signal integrity below 32.4 V during 100 A surge events, preventing latch-up or damage to 3.3 V/5 V interface circuitry while supporting AEC-Q100 Grade 2 temperature range. |
Use Scenario: Safeguarding PLC digital input channels connected to 24 V field wiring exposed to relay coil flyback and ESD from operator contact. IC Role / Device Role / Timing Role: Primary overvoltage clamp on each input channel, mounted directly at connector entry point to shunt energy before reaching optocoupler or level-shifter IC. Use Value: Limits transient voltage to ≤32.4 V within <1 ns, ensuring compatibility with 24 V logic inputs and eliminating need for secondary RC filtering or series resistors. |
| DC Power Rail Protection | USB/Serial Interface Protection |
Use Scenario: Secondary surge protection on 12 V or 24 V board-level power rails downstream of primary DC/DC converters in telematics units. IC Role / Device Role / Timing Role: Parallel-connected TVS across VIN and GND, activated only during overvoltage events exceeding 20 V, minimizing standby leakage. Use Value: Absorbs up to 1500 W surge energy without degradation, maintaining rail stability during ISO 7637-2 Pulse 5a (load dump), and supports continuous 12 V/24 V operation up to +150 °C. |
Use Scenario: Protecting RS-485 transceiver pins or USB VBUS lines in industrial gateways against ESD (IEC 61000-4-2 ±15 kV) and cable discharge events. IC Role / Device Role / Timing Role: Bidirectional clamp between data pair (A/B) or VBUS/GND, leveraging symmetrical response to handle both positive and negative transients on shared lines. Use Value: Clamps ESD pulses to <32.4 V within nanoseconds, preserving signal eye diagram integrity and preventing damage to transceiver ESD structures rated for ≤30 V HBM. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20CA | Same VWM (20 V), lower PPPM (400 W), SMA package (DO-214AC), higher RθJA (110 °C/W) | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a or IEC 61000-4-5 Level 4 | Select when space constraints favor smaller footprint and surge requirements are ≤400 W (e.g., consumer USB ports) |
| SMBJ20CA | Same VWM (20 V), PPPM = 600 W, SMB package (DO-214AA), RθJA = 90 °C/W | Insufficient for automotive load dump; requires larger copper area to achieve same thermal margin as SMCG | Prefer for cost-sensitive industrial controls where 600 W surge immunity suffices and AEC-Q101 is not mandated |
Compared with SMAJ20CA and SMBJ20CA, the SMCG20CAHE3/57T delivers 2.5× and 2.5× higher peak pulse power respectively, lower thermal resistance, and AEC-Q101 validation-making it the only option among the three qualified for under-hood automotive deployment with full ISO 7637-2 compliance.
Availability
SMCG20CAHE3/57T is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and DC power rail protection requiring stable component supply, AEC-Q101 assurance, and 1500 W surge immunity.
Supply support for SMCG20CAHE3/57T 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 high-reliability, automotive-qualified components.
The SMCG series was developed specifically for high-power, low-profile transient suppression in space-constrained automotive and industrial systems, combining AEC-Q101 qualification with DO-215AB mechanical robustness and 1500 W surge capability.
FAQ
What is the clamping voltage of SMCG20CAHE3/57T at its rated peak pulse current?
The SMCG20CAHE3/57T has a maximum clamping voltage (VC) of 32.4 V at its rated peak pulse current (IPPM) of 46.3 A under a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during worst-case surge events. The SMCG20CAHE3/57T maintains this clamping performance consistently across its operating temperature range.
Is SMCG20CAHE3/57T suitable for automotive applications?
Yes, SMCG20CAHE3/57T is AEC-Q101 qualified and explicitly rated for automotive use, including under-hood environments. Its –55 °C to +150 °C operating junction temperature range, MSL Level 1 reflow compatibility, and validation against HTOL, temperature cycling, and ESD make it suitable for ADAS sensors, body control modules, and infotainment power supplies. The SMCG20CAHE3/57T meets automotive surge standards including ISO 7637-2 Pulse 1, 2a, and 5a.
Does SMCG20CAHE3/57T require polarity-aware PCB layout?
No, SMCG20CAHE3/57T is a bidirectional TVS diode with symmetrical electrical characteristics in both directions, so it has no cathode band marking and no functional polarity. The SMCG20CAHE3/57T can be placed in either orientation on the PCB without affecting protection performance-ideal for differential signal lines, AC-coupled interfaces, or space-constrained layouts where orientation flexibility is critical.
What is the thermal resistance of SMCG20CAHE3/57T, and how does it impact PCB design?
The SMCG20CAHE3/57T 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. This value guides copper pour sizing: reducing pad area increases thermal resistance and may require derating of PPPM. For continuous power dissipation, the SMCG20CAHE3/57T's 6.5 W rating at TA = 50 °C must be verified with actual board layout and airflow conditions.
How does SMCG20CAHE3/57T compare to unidirectional variants like SMCG20AHE3/57T?
The SMCG20CAHE3/57T is bidirectional with identical VBR, VC, and IPPM in both directions, whereas SMCG20AHE3/57T is unidirectional and conducts only in reverse bias-requiring correct polarity placement and offering no protection against positive transients on the anode side. The SMCG20CAHE3/57T is preferred for floating, differential, or AC signal paths; SMCG20AHE3/57T suits DC-biased lines where polarity is fixed and forward conduction must be blocked.
SMCG20CAHE3/57T 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):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 46.3A
- 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)
SMCG20CAHE3/57T FAQ
1.How can I place an order for SMCG20CAHE3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG20CAHE3/57T 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 SMCG20CAHE3/57T reliable?
The price and inventory of SMCG20CAHE3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCG20CAHE3/57T is usually 5 days.
3.What payment methods are accepted for SMCG20CAHE3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG20CAHE3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG20CAHE3/57T?
SMCG20CAHE3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG20CAHE3/57T 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 SMCG20CAHE3/57T?
For technical support, including SMCG20CAHE3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG20CAHE3/57T requirements.
6.How does Aetrix verify that SMCG20CAHE3/57T is sourced from the original manufacturer or authorized distributors?
All SMCG20CAHE3/57T 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 SMCG20CAHE3/57T meets industry standards.
7.What is the process for return or replacement of SMCG20CAHE3/57T?
All SMCG20CAHE3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCG20CAHE3/57T, 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 SMCG20CAHE3/57T part is unused and in its original packaging.
Return procedure for SMCG20CAHE3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCG20CAHE3/57T Tags
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