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Vishay General Semiconductor - Diodes Division SMCG51CA-M3/9AT
- Part No.:
- SMCG51CA-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG51CA-M3/9AT.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO215AB
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMCG51CA-M3/9AT from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in the SMCG (DO-215AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 51 V standoff voltage (VWM), 56.7–62.7 V breakdown voltage (VBR) at 1 mA, 1500 W peak pulse power (10/1000 µs), clamping voltage of 82.4 V at 18.2 A IPPM, and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the SMCG51CA-M3/9AT datasheet, SMCG51CA-M3/9AT pinout, SMCG51CA-M3/9AT application, or SMCG51CA-M3/9AT equivalent, key selection criteria include bidirectional clamping capability, low incremental surge resistance, MSL Level 1 moisture sensitivity, halogen-free RoHS compliance (M3 suffix), and suitability for high-energy transients on signal lines and power rails in harsh environments.
Technical Context
This device operates as a voltage-clamped crowbar during ESD and lightning-induced surges, with symmetrical bidirectional conduction enabling protection without polarity constraints. Its glass-passivated junction ensures stable VBR tolerance and fast response time (<1 ns), while the DO-215AB package delivers low thermal resistance (RθJL = 15 °C/W) and supports automated SMT placement.
The SMCG51CA-M3/9AT is rated for -55 °C to +150 °C operating junction temperature, 1000 µA max reverse leakage at VWM, and meets UL 497B recognition (QVGQ2). It is not intended for continuous forward conduction - its unidirectional IFSM rating does not apply, as it is strictly bidirectional.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - maximum continuous reverse working voltage before clamping initiates; defines safe operating margin below breakdown. |
| VBR (min/max) | 56.7 V / 62.7 V at 1 mA - tight breakdown window ensures predictable turn-on across production lots and temperature. |
| VC @ IPPM | 82.4 V at 18.2 A - clamping voltage under 10/1000 µs surge; determines maximum stress imposed on protected circuitry. |
| PPPM | 1500 W - peak pulse power handling capacity; enables suppression of high-energy transients per IEC 61000-4-5 Level 4. |
| Package | SMCG (DO-215AB) - surface-mount, low-profile package with matte tin-plated leads; compatible with J-STD-002 solderability standards. |
| Qualification | AEC-Q101 qualified - validated for automotive applications including engine control units, infotainment, and ADAS sensor interfaces. |
| Compliance | Halogen-free, RoHS-compliant (M3 suffix); UL 497B recognized (QVGQ2); MSL Level 1 (260 °C reflow peak). |
Pinout & Package
SMCG51CA-M3/9AT uses the SMCG (DO-215AB) package: a dual-leaded, gull-wing surface-mount outline with no polarity marking (bidirectional configuration). The case is molded compound meeting UL 94 V-0 flammability rating; terminals are matte tin-plated for reliable solder joint formation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional terminal pair | No functional distinction - either lead may connect to line or return; enables polarity-agnostic placement on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., CAN bus, USB D+/D−, sensor differential pairs) without external diode pairing. |
| 1500 W peak pulse power | Withstands 10/1000 µs surges up to 18.2 A - sufficient for IEC 61000-4-5 open-circuit test levels up to 4 kV (2 Ω source impedance). |
| AEC-Q101 qualification | Validated for automotive underhood and cabin environments, including temperature cycling, humidity bias, and mechanical shock per AEC standard. |
| Low clamping ratio (VC/VBR ≈ 1.34) | Minimizes voltage overshoot during clamping - critical for protecting 3.3 V or 5 V logic interfaces downstream of the TVS. |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow profiles up to 260 °C peak - eliminates bake requirements and simplifies manufacturing. |
Applications
| Automotive Sensor Protection | Industrial CAN Bus Interface |
|---|---|
|
Use Scenario: Protecting ABS wheel speed sensors and camera module LVDS lines from load-dump and ISO 7637-2 transients. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector entry point to shunt surge energy before reaching analog front-end or serializer ICs. Use Value: Prevents latch-up or gate oxide damage in downstream ASICs by limiting transient voltage to ≤82.4 V during 10/1000 µs surges up to 1500 W. |
Use Scenario: Safeguarding CANH/CANL lines in industrial PLC modules exposed to motor drive noise and relay switching spikes. IC Role / Device Role / Timing Role: Symmetrical TVS pair (one per line) providing common-mode and differential-mode surge suppression without polarity alignment. Use Value: Maintains CAN signal integrity by clamping transients within ±82.4 V while preserving <100 pF junction capacitance at 0 V bias - no data rate degradation. |
| Telecom Power Rail Protection | Consumer USB-C Port ESD |
|
Use Scenario: Shielding 48 V DC power inputs in PoE-powered network switches from induced lightning surges. IC Role / Device Role / Timing Role: Primary-level TVS mounted upstream of DC-DC converter input to absorb bulk surge energy before regulation stage. Use Value: Handles 1500 W peak pulses without degradation, reducing need for secondary protection stages and lowering BOM cost. |
Use Scenario: ESD and cable discharge protection for USB-C CC and VBUS pins in portable audio devices and docking stations. IC Role / Device Role / Timing Role: Bidirectional clamp placed adjacent to connector to divert >8 kV HBM ESD events before reaching USB controller or power delivery IC. Use Value: Achieves <1 ns response time and 1000 µA leakage at 51 V - negligible standby current impact on battery-powered systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ51CA-E3/57T | Same VWM (51 V), same bidirectional function, but SMA (DO-214AC) package - larger footprint (4.5 × 2.7 mm vs. 3.8 × 2.6 mm) and higher RθJA (110 °C/W vs. 75 °C/W). | Less suitable for space-constrained automotive modules; lower power derating above 25 °C due to thermal resistance. | Select when legacy SMA footprint compatibility is required or when higher surge repetition rate demands greater thermal mass. |
| TPSMD51CA | Identical electrical specs (51 V VWM, 1500 W PPPM), but in SOD-123FL package - smaller size (2.7 × 1.7 mm), lower surge current rating (16.5 A IPPM), and no AEC-Q101 qualification. | Not approved for automotive use; limited to consumer or industrial applications where qualification is non-mandatory. | Choose only for cost-sensitive, non-automotive designs where board space is extremely limited and qualification is unnecessary. |
Compared with SMAJ51CA-E3/57T and TPSMD51CA, the SMCG51CA-M3/9AT offers superior thermal performance in a compact automotive-qualified package - making it optimal for next-generation ECUs and ADAS sensor nodes requiring both miniaturization and AEC-Q101 compliance.
Availability
SMCG51CA-M3/9AT is available at Aetrix Electronics and suitable for automotive sensor protection, industrial CAN bus interface, telecom power rail protection, and consumer USB-C port ESD requiring stable component supply and long-term lifecycle support.
Supply support for SMCG51CA-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 is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMCG series was developed to deliver high-power transient suppression in compact, automotive-qualified surface-mount packages - targeting design-in for harsh-environment electronics where space, thermal performance, and qualification rigor are critical.
FAQ
What is the clamping voltage of SMCG51CA-M3/9AT at its rated peak pulse current?
The SMCG51CA-M3/9AT has a maximum clamping voltage (VC) of 82.4 V at its specified peak pulse current (IPPM) of 18.2 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 surge events. The SMCG51CA-M3/9AT maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is SMCG51CA-M3/9AT suitable for automotive applications?
Yes, SMCG51CA-M3/9AT is AEC-Q101 qualified and explicitly rated for automotive use, including underhood and cabin environments subject to wide temperature swings, vibration, and high-energy transients. Its halogen-free (M3) construction, UL 497B recognition, and MSL Level 1 reflow compatibility make it appropriate for engine control units, ADAS cameras, and body electronics. The SMCG51CA-M3/9AT meets all stress tests defined in the AEC-Q101 standard.
Does SMCG51CA-M3/9AT have polarity markings on the package?
No, SMCG51CA-M3/9AT does not have polarity markings because it is a bidirectional TVS diode. The device functions identically regardless of orientation on the PCB - both terminals are electrically symmetrical. This eliminates assembly errors and simplifies layout for differential or AC-coupled signal lines. The SMCG51CA-M3/9AT's DO-215AB package is unmarked, consistent with Vishay's specification for CA-suffix bidirectional variants.
What is the maximum reverse leakage current for SMCG51CA-M3/9AT at its standoff voltage?
The SMCG51CA-M3/9AT exhibits a maximum reverse leakage current (ID) of 1000 µA at its 51 V standoff voltage (VWM), measured at 25 °C. This leakage remains stable across temperature and ensures minimal power loss in always-on circuits such as automotive wake-up lines or IoT sensor bias networks. The SMCG51CA-M3/9AT's leakage performance is verified per JEDEC JESD22-A114 test conditions.
How does the SMCG51CA-M3/9AT differ from unidirectional SMCG51A-M3/9AT?
The SMCG51CA-M3/9AT is bidirectional with symmetrical breakdown in both directions, while the unidirectional SMCG51A-M3/9AT has a cathode band and conducts only in reverse bias. The "CA" suffix denotes bidirectional operation, resulting in identical VBR min/max (56.7–62.7 V) and VC (82.4 V) but no IFSM rating - since SMCG51CA-M3/9AT lacks forward surge capability. The SMCG51CA-M3/9AT is selected for AC, differential, or floating-line protection where polarity cannot be guaranteed.
SMCG51CA-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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 82.4V
- Current - Peak Pulse (10/1000µs):
- 18.2A
- 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)
SMCG51CA-M3/9AT FAQ
1.How can I place an order for SMCG51CA-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG51CA-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 SMCG51CA-M3/9AT reliable?
The price and inventory of SMCG51CA-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 SMCG51CA-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCG51CA-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG51CA-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG51CA-M3/9AT?
SMCG51CA-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG51CA-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 SMCG51CA-M3/9AT?
For technical support, including SMCG51CA-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG51CA-M3/9AT requirements.
6.How does Aetrix verify that SMCG51CA-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCG51CA-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 SMCG51CA-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCG51CA-M3/9AT?
All SMCG51CA-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCG51CA-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 SMCG51CA-M3/9AT part is unused and in its original packaging.
Return procedure for SMCG51CA-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCG51CA-M3/9AT Tags
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