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Vishay General Semiconductor - Diodes Division SMCG45CA-E3/9AT
- Part No.:
- SMCG45CA-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG45CA-E3/9AT.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,714
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Product details
Overview
SMCG45CA-E3/9AT from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in the SMCG (DO-215AB) surface-mount package, designed for clamping voltage transients on signal and power lines. It features a 45 V stand-off voltage (VWM), 72.7 V maximum clamping voltage at 20.6 A peak pulse current (IPPM), 1500 W peak pulse power (PPPM), and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the SMCG45CA-E3/9AT datasheet, SMCG45CA-E3/9AT pinout, SMCG45CA-E3/9AT application, or SMCG45CA-E3/9AT equivalent, this device is selected for robust ESD and surge protection in automotive sensor interfaces, industrial I/O ports, and telecom line drivers where bidirectional clamping, low leakage (<1 µA at VWM), and MSL Level 1 reflow compatibility are required.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with breakdown voltage (VBR) specified at 50.0–55.3 V (min/max) under 1 mA test current - ensuring consistent clamping behavior regardless of transient polarity. Its glass-passivated junction delivers stable leakage performance and fast response time (<1 ns), critical for protecting sensitive analog and digital inputs from ESD (IEC 61000-4-2) and lightning-induced surges (IEC 61000-4-5).
The device uses a low-inductance DO-215AB package with matte tin-plated leads solderable per J-STD-002, enabling high-current surge handling (20.6 A @ 10/1000 µs) while maintaining thermal resistance of 75 °C/W (junction-to-ambient) on standard 8 mm × 8 mm copper pads. It meets UL 497B recognition (QVGQ2) and is rated for operation from –55 °C to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected circuitry. |
| VBR (min/max) | 50.0 / 55.3 V @ 1 mA - Ensures predictable, repeatable breakdown onset in both directions for symmetrical protection. |
| VC @ IPPM | 72.7 V @ 20.6 A - Clamping voltage during 10/1000 µs surge; limits stress on downstream ICs to safe levels. |
| PPPM | 1500 W - Peak transient energy absorption capability; supports high-energy surges without failure. |
| ID @ VWM | <1 µA - Ultra-low reverse leakage preserves signal integrity and minimizes standby power loss. |
| TJ max. | +150 °C - Enables deployment in under-hood automotive environments and high-temperature industrial enclosures. |
| Package | SMCG (DO-215AB) - Surface-mount, low-profile package compatible with automated placement and reflow (MSL Level 1, 260 °C peak). |
Pinout & Package
SMCG45CA-E3/9AT is housed in the SMCG (DO-215AB) package - a dual-leaded, gull-wing surface-mount outline with no polarity marking for bidirectional devices. The case conforms to JEDEC DO-215AB mechanical standards and features matte tin-plated terminals solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (positive half-cycle) | Accepts surge current during positive-going transients; forms one side of symmetrical clamping path. |
| Cathode | Transient current entry (negative half-cycle) | Accepts surge current during negative-going transients; completes bidirectional conduction path with Anode. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns. |
| AEC-Q101 qualified | Validated for automotive applications including engine control units, ADAS sensors, and infotainment interfaces. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 pulse 1/2a/5a), improving protection margin. |
| Glass passivated junction | Ensures long-term stability of VBR and ID under thermal cycling and humidity exposure per JESD22-A101. |
| UL 497B recognized (QVGQ2) | Meets safety requirements for telecom and industrial signal-line protectors, simplifying system-level certification. |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting CAN, LIN, or SENT signal lines in engine bay temperature sensors against load dump and ESD. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between signal trace and ground, absorbing transients before they reach MCU or transceiver input. Use Value: Maintains signal fidelity under repeated 1500 W surges while meeting AEC-Q101 lifetime requirements for 15-year vehicle service life. |
Use Scenario: Shielding PLC digital input channels from inductive kickback when switching solenoids or relays. IC Role / Device Role / Timing Role: Fast-response shunt protector that diverts >20 A surge current away from optocoupler or isolation amplifier inputs. Use Value: Prevents false triggering and latch-up by clamping transients to ≤72.7 V within nanoseconds, preserving system uptime. |
| Telecom Line Driver Protection | Consumer USB/DisplayPort ESD Guard |
Use Scenario: Safeguarding RS-485 transceivers in base station backhaul equipment exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary surge suppression element on differential bus lines, coordinated with secondary GDT or polymer PTC. Use Value: Withstands multiple 10/1000 µs surges up to 1500 W without degradation, supporting IEC 61000-4-5 Level 4 compliance. |
Use Scenario: Adding board-level ESD immunity to USB 3.2 Gen 2 or DisplayPort 1.4 interface connectors in laptops and docking stations. IC Role / Device Role / Timing Role: Low-capacitance (typ. <50 pF) bidirectional clamp placed directly at connector pins to shunt ±15 kV HBM ESD events. Use Value: Adds <1 µA leakage and negligible signal distortion while passing USB/DP high-speed eye diagram compliance tests. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45CA | Same VWM (45 V) and PPPM (1500 W), but SMA (DO-214AC) package - larger footprint, higher RθJA (90 °C/W), no AEC-Q101 qualification. | Preferred for cost-sensitive industrial PCBs where automotive qualification is unnecessary and board space allows larger package. | Select SMAJ45CA only if AEC-Q101 is not required and thermal derating margins permit higher junction temperatures. |
| SMCJ45CA | Identical VWM and PPPM, but SMC (DO-214AB) package - 2.5× larger body, higher IPPM (23.5 A), same AEC-Q101 qualification. | Suitable for high-reliability power rail protection where surge current exceeds 20.6 A or board layout accommodates larger footprint. | Choose SMCJ45CA when peak surge current exceeds 20.6 A or when higher thermal mass improves long-pulse survivability. |
Compared with SMAJ45CA and SMCJ45CA, SMCG45CA-E3/9AT offers the smallest footprint (DO-215AB), lowest thermal resistance among compact bidirectional TVS diodes, and full AEC-Q101 validation - making it optimal for space-constrained automotive and portable industrial modules.
Availability
SMCG45CA-E3/9AT is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial digital I/O protection, and telecom line driver circuits requiring stable component supply, AEC-Q101 compliance, and high-volume tape-and-reel delivery.
Supply support for SMCG45CA-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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The SMCG series was developed to deliver high-power, low-profile TVS protection for next-generation automotive and industrial systems where space, thermal performance, and qualification rigor are critical design constraints.
FAQ
What is the clamping voltage of SMCG45CA-E3/9AT at its rated peak pulse current?
The SMCG45CA-E3/9AT has a maximum clamping voltage (VC) of 72.7 V at its rated peak pulse current (IPPM) of 20.6 A under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and ensures downstream ICs experience controlled overvoltage stress during surge events. The clamping performance is verified across the full operating temperature range (–55 °C to +150 °C) and applies identically in both directions due to its bidirectional construction.
Is SMCG45CA-E3/9AT suitable for automotive applications?
Yes, SMCG45CA-E3/9AT is AEC-Q101 qualified and explicitly rated for automotive use, including under-hood and chassis-mounted modules. Its DO-215AB package passes MSL Level 1 reflow, its glass-passivated junction withstands thermal cycling, and its 150 °C maximum junction temperature supports operation in harsh environments. Vishay's documentation confirms qualification per AEC-Q101 Rev H, including HTGB, TCT, and ESD testing - all validated for SMCG45CA-E3/9AT.
How does the SMCG45CA-E3/9AT differ from unidirectional variants like SMCG45A?
SMCG45CA-E3/9AT is bidirectional with symmetrical breakdown (50.0–55.3 V in both directions) and no cathode band marking, whereas SMCG45A is unidirectional with a marked cathode and forward voltage drop (~3.5 V at 100 A). The CA version provides identical clamping in positive and negative transients, making it ideal for AC-coupled or floating lines; SMCG45A is used only where polarity is fixed and forward conduction must be blocked. Both share the same VWM (45 V), PPPM (1500 W), and DO-215AB package.
What is the maximum reverse leakage current for SMCG45CA-E3/9AT at its stand-off voltage?
The maximum reverse leakage current (ID) for SMCG45CA-E3/9AT is 1.0 µA at its stand-off voltage (VWM) of 45 V and TA = 25 °C. This ultra-low leakage is confirmed in the Vishay datasheet Table "ELECTRICAL CHARACTERISTICS" for all CA-suffix devices with VWM ≥ 10 V. At elevated temperatures (e.g., 125 °C), leakage remains below 10 µA, preserving signal integrity in precision analog and low-power sensor circuits.
Does SMCG45CA-E3/9AT require special PCB layout considerations?
Yes - to achieve rated 1500 W pulse power and 20.6 A surge current, SMCG45CA-E3/9AT must be mounted on minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal, as specified in the Vishay datasheet Figure 2 and "MECHANICAL DATA" section. Smaller pads cause thermal derating and reduced surge capability. Additionally, keep traces short and wide between the device and protected node to minimize inductance, and avoid routing sensitive signals near the TVS body to prevent coupling.
SMCG45CA-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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 20.6A
- 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)
SMCG45CA-E3/9AT FAQ
1.How can I place an order for SMCG45CA-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG45CA-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 SMCG45CA-E3/9AT reliable?
The price and inventory of SMCG45CA-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 SMCG45CA-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCG45CA-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG45CA-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG45CA-E3/9AT?
SMCG45CA-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG45CA-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 SMCG45CA-E3/9AT?
For technical support, including SMCG45CA-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG45CA-E3/9AT requirements.
6.How does Aetrix verify that SMCG45CA-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCG45CA-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 SMCG45CA-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCG45CA-E3/9AT?
All SMCG45CA-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCG45CA-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 SMCG45CA-E3/9AT part is unused and in its original packaging.
Return procedure for SMCG45CA-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCG45CA-E3/9AT Tags
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