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Vishay General Semiconductor - Diodes Division SMCG20A-M3/57T
- Part No.:
- SMCG20A-M3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG20A-M3/57T.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,229
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Product details
Overview
SMCG20A-M3/57T 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 20 V stand-off voltage (VWM), 22.2–24.5 V breakdown voltage (VBR) at 1 mA, 1500 W peak pulse power (10/1000 µs), 46.3 A peak pulse current (IPPM), and clamps to 32.4 V at rated surge. It is widely deployed in automotive powertrain control modules to protect CAN transceivers against load dump and inductive switching transients.
For engineers reviewing the SMCG20A-M3/57T datasheet, SMCG20A-M3/57T pinout, SMCG20A-M3/57T application, or SMCG20A-M3/57T equivalent, key selection criteria include its AEC-Q101 qualification, halogen-free RoHS-compliant M3 suffix, 150 °C maximum junction temperature, low incremental surge resistance, and compatibility with automated SMT placement on standard PCB pads per JEDEC MO-229.
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, entering avalanche conduction when reverse voltage exceeds VBR. Its glass-passivated junction ensures stable breakdown characteristics and long-term reliability under repetitive surge stress.
The SMCG20A-M3/57T is rated for 1500 W peak pulse power (10/1000 µs waveform), with thermal resistance RθJA = 75 °C/W and RθJL = 15 °C/W, enabling effective heat dissipation when mounted on 8.0 mm × 8.0 mm copper pads - critical for sustained operation in automotive under-hood environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal line operating margin. |
| VBR (min/max) | 22.2 V / 24.5 V at IT = 1 mA - Confirmed breakdown range ensures predictable turn-on during transients without premature conduction. |
| VC @ IPPM | 32.4 V - Clamping voltage at 46.3 A peak pulse; determines maximum stress imposed on downstream ICs during surge events. |
| PPPM | 1500 W - Peak pulse power handling capability with 10/1000 µs waveform; supports high-energy automotive load-dump immunity. |
| TJ max | +150 °C - Enables reliable operation in under-hood automotive applications where ambient temperatures exceed 105 °C. |
| Package | SMCG (DO-215AB) - Surface-mount gull-wing package with matte tin-plated leads; optimized for automated placement and J-STD-002 solderability. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance per AEC-Q101 Rev D. |
Pinout & Package
SMCG20A-M3/57T uses the SMCG (DO-215AB) surface-mount package: gull-wing leads, 0.220–0.245 inch body length, 0.115–0.125 inch width, and cathode band marking on the anode-side end cap. Leads are matte tin-plated and compliant with J-STD-002 and JESD 22-B102 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to ground or low-impedance return path in unidirectional TVS configuration. | Provides low-impedance surge current path to reference plane during clamping; polarity must match PCB silkscreen cathode band. |
| Cathode | Current exit terminal in forward bias; connected to protected line (e.g., CAN_H, LIN, sensor supply). | Defines clamping node - voltage at this terminal rises no higher than VC (32.4 V) during 46.3 A surge, protecting downstream components. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift in harsh automotive environments. |
| AEC-Q101 qualification | Validates performance across -55 °C to +150 °C, including 1000-cycle temperature cycling and 1000-hour HTRB, meeting automotive OEM requirements. |
| Halogen-free (M3 suffix) | Complies with IEC 61249-2-21 and IPC-4101D; eliminates brominated flame retardants while maintaining UL 94 V-0 flammability rating. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a/5a), improving clamping precision. |
| MSL Level 1 (J-STD-020) | Allows unlimited floor life and reflow up to 260 °C peak - compatible with standard lead-free SMT assembly without dry-pack requirements. |
Applications
| Automotive Powertrain Control Unit (PCU) | Industrial Motor Drive I/O Protection |
|---|---|
Use Scenario: Protecting 24 V CAN FD bus lines in engine control units exposed to alternator load dump (ISO 16750-2) and inductive kickback from solenoid drivers. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed directly at connector interface to limit transient voltage to ≤32.4 V before reaching CAN transceiver. Use Value: Prevents permanent damage to NXP TJA1057 or ST TPD1E05U06 transceivers during 120 V/50 ms load dump events by diverting >46 A surge current away from IC pins. | Use Scenario: Safeguarding analog input channels (0–10 V, 4–20 mA) on PLC analog I/O modules subjected to field-wiring ESD and relay contact bounce. IC Role / Device Role / Timing Role: Standoff-mode protector on signal lines upstream of precision op-amps and ADC front-ends (e.g., AD7124). Use Value: Maintains signal integrity by limiting leakage to ≤1.0 µA at 20 V while clamping 1 kV ESD (IEC 61000-4-2) to <33 V - preserving 16-bit measurement accuracy. |
| Automotive Body Control Module (BCM) | Telecom Power Supply Input Stage |
Use Scenario: Shielding LIN bus transceivers and microcontroller GPIOs in door module ECUs from battery reverse connection and jump-start surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12 V supply rail feeding Infineon TLE7231 or TI TLIN1028 LIN transceivers. Use Value: Withstands 200 A non-repetitive forward surge (IFSM) and clamps 12 V rail to 32.4 V, preventing latch-up or gate oxide rupture in protected ICs during 24 V jump-start conditions. | Use Scenario: Front-end protection for AC/DC power supplies in base station remote radio units exposed to lightning-induced surges on -48 V DC distribution lines. IC Role / Device Role / Timing Role: Secondary surge suppression stage after MOV-based primary protection, handling residual 10/1000 µs transients. Use Value: Delivers precise 32.4 V clamping with minimal capacitance (<100 pF), avoiding signal distortion on high-frequency control loops while absorbing 1500 W energy bursts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A-E3/57T | Same VWM (20 V) and VC (32.4 V), but lower PPPM (400 W) and IPPM (12.3 A); SMA (DO-214AC) package, smaller footprint. | Not AEC-Q101 qualified; limited to industrial/commercial use; insufficient for automotive load dump immunity. | Select only for cost-sensitive, non-automotive designs with lower surge exposure and space-constrained layouts. |
| SMCJ20A-M3/57T | Higher PPPM (1500 W) and identical VWM/VC, but larger SMC (DO-214AB) package; same AEC-Q101 qualification and M3 halogen-free status. | Requires larger PCB pad area (10.16 mm × 7.11 mm vs. SMCG's 7.87 mm × 6.22 mm); better thermal mass but less suitable for dense automotive modules. | Choose when higher thermal margin is needed or when existing SMC footprint is standardized across platform designs. |
Compared with SMAJ20A-E3/57T and SMCJ20A-M3/57T, SMCG20A-M3/57T uniquely balances AEC-Q101 compliance, 1500 W surge capability, and compact DO-215AB packaging - making it optimal for next-generation automotive ECUs where board space, reliability, and regulatory alignment are jointly constrained.
Availability
SMCG20A-M3/57T is available at Aetrix Electronics and suitable for automotive powertrain control, industrial motor drive I/O, telecom power supply inputs, and body electronics requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMCG20A-M3/57T 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 AEC-Q101-compliant transient suppression in space-constrained automotive and industrial systems, combining high-power surge handling with low-profile gull-wing packaging for automated manufacturing.
FAQ
What is the maximum clamping voltage of the SMCG20A-M3/57T under rated surge conditions?
The SMCG20A-M3/57T clamps to a maximum of 32.4 V at its rated peak pulse current (IPPM) of 46.3 A using the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's datasheet revision 09-Jan-2024, Document Number 88457. The clamping voltage directly defines the upper voltage limit imposed on protected circuitry during surge events, making it a critical parameter for ensuring downstream IC survival. For the SMCG20A-M3/57T, this 32.4 V clamping level provides sufficient margin below typical 3.3 V or 5 V logic rail absolute maximum ratings when used with appropriate series impedance.
Is the SMCG20A-M3/57T suitable for bidirectional transient protection?
No, the SMCG20A-M3/57T is a unidirectional transient voltage suppressor, as indicated by the "A" suffix (not "CA"). Its electrical characteristics - including breakdown voltage, clamping behavior, and forward surge rating - apply only in reverse-bias mode. Bidirectional operation requires the CA-suffixed variant (e.g., SMCG20CA), which exhibits symmetrical VBR and VC in both polarities. Using SMCG20A-M3/57T in bidirectional applications risks forward conduction and failure during positive transients. Always verify polarity marking (cathode band) and match the device type to system signal swing requirements.
Does the M3 suffix on SMCG20A-M3/57T indicate halogen-free construction?
Yes, the M3 suffix on SMCG20A-M3/57T explicitly denotes halogen-free, RoHS-compliant, industrial-grade construction per Vishay's ordering nomenclature. This includes absence of brominated and chlorinated flame retardants while maintaining UL 94 V-0 flammability rating. The molding compound and plating meet IEC 61249-2-21 and IPC-4101D specifications. Unlike E3-suffixed variants, M3 parts eliminate halogen content without compromising thermal or mechanical performance - a requirement for many Tier 1 automotive and green electronics programs. The SMCG20A-M3/57T is fully traceable to Vishay's material declarations.
What is the thermal resistance profile of the SMCG20A-M3/57T, and how does it affect layout design?
The SMCG20A-M3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead resistance (RθJL) of 15 °C/W, measured on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. These values assume minimum recommended pad layout per Vishay's datasheet Figure 6. To achieve rated 1500 W pulse power, PCB layout must replicate this copper area and ensure adequate thermal via density beneath the leads. Reducing pad size increases RθJA, derating pulse capability - e.g., halving pad area may reduce IPPM by ~25%. Layout verification per JEDEC JESD51-2 is strongly advised for automotive applications.
How does the AEC-Q101 qualification of SMCG20A-M3/57T impact its use in automotive designs?
The AEC-Q101 qualification of SMCG20A-M3/57T certifies compliance with rigorous stress tests including 1000-cycle temperature cycling (-55 °C to +150 °C), 1000-hour high-temperature reverse bias (HTRB), and surge endurance - validating suitability for automotive powertrain, chassis, and body electronics. This qualification enables direct acceptance by OEMs without additional component-level qualification, shortening design-in cycles. Unlike non-AEC parts, SMCG20A-M3/57T guarantees parametric stability over lifetime under real-world under-hood thermal and vibration profiles. Its qualification applies specifically to the M3-suffixed SMCG family, not generic equivalents.
SMCG20A-M3/57T 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):
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCG)
SMCG20A-M3/57T FAQ
1.How can I place an order for SMCG20A-M3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG20A-M3/57T 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 SMCG20A-M3/57T reliable?
The price and inventory of SMCG20A-M3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCG20A-M3/57T is usually 5 days.
3.What payment methods are accepted for SMCG20A-M3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG20A-M3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG20A-M3/57T?
SMCG20A-M3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG20A-M3/57T 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 SMCG20A-M3/57T?
For technical support, including SMCG20A-M3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG20A-M3/57T requirements.
6.How does Aetrix verify that SMCG20A-M3/57T is sourced from the original manufacturer or authorized distributors?
All SMCG20A-M3/57T 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 SMCG20A-M3/57T meets industry standards.
7.What is the process for return or replacement of SMCG20A-M3/57T?
All SMCG20A-M3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCG20A-M3/57T, 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 SMCG20A-M3/57T part is unused and in its original packaging.
Return procedure for SMCG20A-M3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCG20A-M3/57T Tags
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