My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMCG20A-M3/9AT
- Part No.:
- SMCG20A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG20A-M3/9AT.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,076
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCG20A-M3/9AT from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in the SMCG (DO-215AB) package, with 20 V stand-off voltage (VWM), 22.2–24.5 V breakdown voltage (VBR), 1500 W peak pulse power (PPPM), and 46.3 A peak pulse current (IPPM) under 10/1000 μs waveform. It protects MOSFETs and signal lines in automotive power electronics against inductive switching transients.
For engineers reviewing the SMCG20A-M3/9AT datasheet, SMCG20A-M3/9AT pinout, SMCG20A-M3/9AT application, or SMCG20A-M3/9AT equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, halogen-free RoHS compliance, thermal resistance (RθJA = 75 °C/W), and bidirectional variant compatibility for robust overvoltage protection design.
Technical Context
The SMCG20A-M3/9AT uses a glass-passivated silicon junction to achieve fast response time (<1 ns) and low incremental surge resistance, enabling effective clamping of ESD and lightning-induced surges before downstream ICs are damaged. Its unidirectional polarity features a cathode band marking and supports DC-biased protection paths.
Designed for surface-mount automated placement, it meets J-STD-020 MSL level 1 (260 °C peak reflow) and JESD 201 class 2 whisker resistance. The DO-215AB case provides UL 94 V-0 flammability rating and thermal performance validated on 8.0 mm × 8.0 mm copper pads per terminal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 22.2 V / 24.5 V at 1.0 mA - Confirmed breakdown threshold range for reliable turn-on margin |
| VC @ IPPM | 32.4 V at 46.3 A - Clamped voltage during 10/1000 μs surge, limiting stress on protected circuitry |
| PPPM | 1500 W - Peak transient energy absorption capability under standardized surge waveform |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance on recommended PCB pad layout |
| TJ max | +150 °C - Maximum junction temperature enabling operation in under-hood automotive environments |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling and HTRB |
Pinout & Package
Package: SMCG (DO-215AB) - Surface-mount gull-wing leaded package with matte tin-plated terminals, 0.310" × 0.400" footprint, UL 94 V-0 molding compound, and polarity indicated by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias | Connected to ground or low-side reference in unidirectional TVS configurations |
| Cathode | Current exit point in forward bias; marked with band | Connected to protected line (e.g., 24 V rail or sensor output) to clamp positive transients |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR over lifetime and immunity to moisture-induced parameter drift |
| AEC-Q101 qualification | Validates suitability for automotive powertrain and body electronics without derating |
| Halogen-free & RoHS compliant (M3 suffix) | Meets EU environmental directives and enables use in green manufacturing processes |
| Low RθJL (15 °C/W) | Enables efficient heat transfer to PCB leads, supporting high-repetition surge events |
| MSL level 1 rating | Permits single-pass reflow at 260 °C without preconditioning or baking |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Protection |
|---|---|
Use Scenario: Protecting 24 V supply rails in junction boxes and battery management systems from load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between rail and chassis ground to clamp positive transients above 20 V. Use Value: Limits clamped voltage to 32.4 V during 46.3 A surges, preventing damage to downstream PMICs and microcontrollers rated for 36 V absolute maximum. | Use Scenario: Safeguarding analog outputs of pressure or temperature sensors connected to PLC I/O modules. IC Role / Device Role / Timing Role: TVS mounted at connector interface to shunt ESD and cable discharge events before reaching precision amplifier inputs. Use Value: Sub-1 ns response ensures clamping occurs prior to 150 ns rise-time transients, preserving signal integrity and ADC accuracy. |
| DC Motor Drive Gate Protection | Telecom Line Interface |
Use Scenario: Shielding high-side N-channel MOSFET gates in brushed DC motor drivers from inductive kickback. IC Role / Device Role / Timing Role: Connected anode-to-ground, cathode-to-gate, clamping gate-source voltage during flyback events. Use Value: 20 V VWM allows normal 12–15 V gate drive while clamping spikes >32.4 V, preventing gate oxide rupture. | Use Scenario: Front-end surge suppression on RS-485 data lines in outdoor base station equipment. IC Role / Device Role / Timing Role: Bidirectional variant (SMCG20CA) used here; SMCG20A-M3/9AT serves as unidirectional alternative where DC bias exists. Use Value: 1500 W PPPM handles IEC 61000-4-5 Level 4 (4 kV) surges without degradation across 1000+ events. |
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), lower PPPM (400 W), SMA (DO-214AC) package | Limited to lower-energy transients; not AEC-Q101 qualified | Select when cost or board space is critical and surge energy stays below 400 W |
| SMCG20CA-M3/9AT | Bidirectional version; identical VWM, VBR, PPPM, and package; no polarity marking | Required for AC-coupled or floating signal lines without DC bias | Choose when protecting differential pairs or transformer-isolated interfaces |
Compared with SMCG20A-M3/9AT, SMAJ20A-E3/57T offers smaller footprint but sacrifices 73% surge capacity and automotive qualification, while SMCG20CA-M3/9AT retains full performance and qualification but removes polarity dependency-making it suitable only where symmetric clamping is needed.
Availability
SMCG20A-M3/9AT is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor protection, and DC motor drive gate protection requiring stable component supply and long-term lifecycle support.
Supply support for SMCG20A-M3/9AT 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 designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices with emphasis on reliability, efficiency, and application-specific performance.
The SMCG series targets high-energy transient suppression in harsh environments, especially automotive and industrial systems where AEC-Q101 qualification, thermal robustness, and repeatable clamping are mandatory.
FAQ
What is the clamping voltage of SMCG20A-M3/9AT at its rated peak pulse current?
The SMCG20A-M3/9AT has a maximum clamping voltage (VC) of 32.4 V at 46.3 A peak pulse current (IPPM), measured under the standard 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is confirmed in the Vishay datasheet revision 09-Jan-2024. Designers must ensure downstream components tolerate this clamped voltage under worst-case surge conditions. The SMCG20A-M3/9AT achieves this with low incremental surge resistance and a glass-passivated junction.
Is SMCG20A-M3/9AT qualified for automotive applications?
Yes, SMCG20A-M3/9AT is AEC-Q101 qualified, as explicitly stated in the Vishay datasheet. This qualification covers stress tests including high-temperature reverse bias, temperature cycling, and humidity bias, validating its use in automotive powertrain, body control, and infotainment systems. The "M3" suffix further confirms halogen-free, RoHS-compliant construction meeting automotive material requirements. SMCG20A-M3/9AT is designed for under-hood and chassis-mounted locations where ambient temperatures reach +125 °C.
What does the "M3" suffix indicate in SMCG20A-M3/9AT?
The "M3" suffix in SMCG20A-M3/9AT denotes halogen-free, RoHS-compliant construction with industrial-grade reliability and JESD 201 class 2 whisker resistance. It distinguishes the part from "E3" (RoHS-compliant but not halogen-free) and "HM3" (halogen-free + AEC-Q101 qualified). All three share the same electrical specs and DO-215AB package, but only HM3 and HE3 variants carry AEC-Q101 certification. SMCG20A-M3/9AT remains fully qualified for industrial and commercial automotive-adjacent applications.
How does SMCG20A-M3/9AT differ from SMCG20CA-M3/9AT?
SMCG20A-M3/9AT is unidirectional with cathode band marking and conducts only in reverse bias above VBR; SMCG20CA-M3/9AT is bidirectional, symmetrical in both directions, and lacks polarity marking. Both share identical VWM (20 V), VBR (22.2–24.5 V), PPPM (1500 W), and DO-215AB packaging. The choice depends on circuit topology: SMCG20A-M3/9AT suits DC-biased rails, while SMCG20CA-M3/9AT fits AC-coupled or floating lines. SMCG20A-M3/9AT cannot replace SMCG20CA-M3/9AT in bidirectional applications without redesign.
What is the thermal resistance of SMCG20A-M3/9AT, and how does it affect layout?
The SMCG20A-M3/9AT 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, as specified in the Vishay datasheet. This value assumes minimum recommended pad layout; reducing pad area increases RθJA and risks thermal runaway during repeated surges. Layouts must allocate sufficient copper area and consider thermal vias to maintain TJ ≤ 150 °C. The lower RθJL (15 °C/W) confirms efficient conduction through leads, making lead soldering quality critical for thermal performance. SMCG20A-M3/9AT relies on PCB copper-not heatsinks-for thermal management.
SMCG20A-M3/9AT 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):
- 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-M3/9AT FAQ
1.How can I place an order for SMCG20A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG20A-M3/9AT 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 SMCG20A-M3/9AT reliable?
The price and inventory of SMCG20A-M3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCG20A-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCG20A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG20A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG20A-M3/9AT?
SMCG20A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG20A-M3/9AT 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 SMCG20A-M3/9AT?
For technical support, including SMCG20A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG20A-M3/9AT requirements.
6.How does Aetrix verify that SMCG20A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCG20A-M3/9AT 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 SMCG20A-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCG20A-M3/9AT?
All SMCG20A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCG20A-M3/9AT, 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 SMCG20A-M3/9AT part is unused and in its original packaging.
Return procedure for SMCG20A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCG20A-M3/9AT Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
