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Vishay General Semiconductor - Diodes Division SMCG33A-E3/57T
- Part No.:
- SMCG33A-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG33A-E3/57T.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:388
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Product details
Overview
SMCG33A-E3/57T from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the SMCG (DO-215AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 33 V stand-off voltage (VWM), 36.7–40.6 V breakdown voltage (VBR) at 1 mA, 1500 W peak pulse power (PPPM), 28.1 A peak pulse current (IPPM), and clamps to 53.3 V at IPPM - ideal for safeguarding MOSFETs, ICs, and sensor signal lines against inductive switching transients and ESD in automotive and industrial systems.
For engineers reviewing the SMCG33A-E3/57T datasheet, SMCG33A-E3/57T pinout, SMCG33A-E3/57T application, or SMCG33A-E3/57T equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 75 °C/W), polarity marking convention, and real-world use cases aligned with UL 497B recognition and J-STD-020 MSL Level 1 compliance.
Technical Context
The SMCG33A-E3/57T operates as a unidirectional avalanche diode with glass-passivated junction, delivering fast response time (<1 ns) and low incremental surge resistance to suppress transient energy before downstream components are stressed. Its bidirectional counterpart is designated SMCG33CA; the "A" suffix confirms unidirectional polarity with cathode band marking.
Rated for -55 °C to +150 °C junction temperature, it supports high-reliability applications under sustained thermal load, with 6.5 W power dissipation at TA = 50 °C on infinite heatsink and 200 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine). The device meets AEC-Q101 stress testing requirements and is RoHS-compliant per E3 suffix.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse operating voltage before clamping begins; defines safe working margin for 24 V nominal systems. |
| VBR (min/max) | 36.7 V / 40.6 V at IT = 1 mA - guaranteed avalanche onset range; ensures consistent turn-on across production lots. |
| VC @ IPPM | 53.3 V - clamping voltage at 28.1 A peak pulse (10/1000 µs); determines maximum stress imposed on protected circuitry. |
| PPPM | 1500 W - peak transient power handling capability; enables protection against IEC 61000-4-5 Level 4 surges. |
| ID @ VWM | 1.0 µA - reverse leakage at rated stand-off; negligible bias current for low-power sensor interfaces. |
| RθJA | 75 °C/W - junction-to-ambient thermal resistance on standard 8 mm × 8 mm copper pads; informs board-level thermal design. |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including HTOL, TC, UHAST, and ESD tests per AEC specification. |
Pinout & Package
Package: SMCG (DO-215AB) - surface-mount, low-profile gull-wing leaded package with matte tin-plated terminals, UL 94 V-0 molding compound, and MSL Level 1 rating (peak reflow ≤260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward conduction mode | Connected to system ground or lower-potential rail during clamping; must be routed with low-inductance path to GND. |
| Cathode | Current exit terminal in forward conduction mode; marked with band | Connected to protected line (e.g., CAN_H, LIN, sensor supply); polarity marking essential for correct installation. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated chip junction | Enables stable, repeatable avalanche characteristics and long-term reliability under repeated surge stress. |
| AEC-Q101 qualification | Validates suitability for automotive powertrain, body electronics, and ADAS modules requiring zero-defect field performance. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients, improving protection margin for 3.3 V/5 V logic and microcontrollers. |
| MSL Level 1, 260 °C peak reflow | Supports standard SMT assembly without moisture sensitivity concerns or baking requirements. |
| UL 497B recognition (QVGQ2) | Confirms compliance with telecom and industrial surge protector safety standards for end-equipment certification. |
Applications
| Automotive Power Line Protection | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Protecting 24 V battery-fed ECUs from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp positive-going surges above 33 V. Use Value: Limits peak voltage to 53.3 V during 1500 W transients, preventing damage to LDOs, CAN transceivers, and MCU power domains. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) from ESD and cable discharge events. IC Role / Device Role / Timing Role: TVS connected between signal line and local ground to absorb sub-100 ns ESD pulses before reaching op-amp inputs. Use Value: 1.0 µA leakage at 33 V avoids loading precision current sources; 53.3 V clamping preserves ADC input integrity. |
| Telecom Interface Protection | Consumer Device USB Port Clamping |
Use Scenario: Safeguarding RS-485 transceivers on industrial backplanes exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional protection not applicable here; SMCG33A-E3/57T used only on DC-biased lines where polarity is fixed. Use Value: 28.1 A IPPM handles IEC 61000-4-5 combination wave (10/700 µs) without degradation after multiple strikes. |
Use Scenario: Adding secondary overvoltage defense on USB VBUS lines in portable medical monitors. IC Role / Device Role / Timing Role: Placed upstream of USB power switch to limit fault voltage during hot-plug or adapter surge events. Use Value: 75 °C/W RθJA allows thermal management on compact PCBs; RoHS/E3 compliance meets global regulatory requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-E3/57T | Same VWM (33 V) and PPPM (400 W), but lower power rating and SMA (DO-214AC) package with higher RθJA (110 °C/W). | Less robust for high-energy surges; suitable only for consumer-grade or low-duty-cycle protection. | Select when cost or board space is critical and surge threat level is below IEC 61000-4-5 Level 2. |
| SMCJ33A-E3/57T | Same VWM (33 V) and DO-214AB package, but higher PPPM (1500 W) and identical SMCG-level clamping (53.3 V), differing only in mechanical outline and thermal pad layout. | Requires revised PCB footprint; offers same electrical protection but different mounting geometry and thermal path. | Choose when legacy SMCJ footprint is already established and DO-215AB rework is not feasible. |
Compared with SMAJ33A-E3/57T and SMCJ33A-E3/57T, the SMCG33A-E3/57T delivers identical clamping performance and surge rating in a lower-profile, AEC-Q101-qualified package optimized for automated placement and automotive thermal cycling - making it the preferred choice where reliability, height constraint, and qualification are mandatory.
Availability
SMCG33A-E3/57T is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface, and telecom infrastructure applications requiring stable component supply, AEC-Q101 validation, and UL-recognized surge protection.
Supply support for SMCG33A-E3/57T 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 reliability, efficiency, and application-specific optimization.
The SMCG series targets high-energy transient suppression in space-constrained, thermally demanding environments - engineered for automotive, industrial, and telecom systems where failure is not an option.
FAQ
What is the polarity configuration of the SMCG33A-E3/57T?
The SMCG33A-E3/57T is a unidirectional TVS diode with cathode indicated by a visible band on the SMCG (DO-215AB) package. During overvoltage events, it conducts from cathode to anode when reverse-biased beyond VBR. This polarity must be observed in PCB layout to ensure proper clamping of positive transients on protected lines.
Does the SMCG33A-E3/57T meet automotive qualification standards?
Yes, the SMCG33A-E3/57T carries the HE3 suffix variant for AEC-Q101 qualification, and the E3/57T version shares the same die and process. It has passed stress tests including high-temperature operating life, temperature cycling, and unbiased HAST - confirming suitability for under-hood and body-control module applications.
What is the maximum clamping voltage of the SMCG33A-E3/57T under surge conditions?
The SMCG33A-E3/57T clamps to 53.3 V at its rated peak pulse current of 28.1 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 transient events.
Can the SMCG33A-E3/57T replace the SMAJ33A in existing designs?
No direct replacement: while both have 33 V VWM, the SMCG33A-E3/57T offers 1500 W PPPM versus 400 W for SMAJ33A and uses DO-215AB instead of DO-214AC. PCB footprint, thermal design, and surge capability differ significantly - redesign and validation are required before substitution.
What is the thermal resistance of the SMCG33A-E3/57T in standard mounting conditions?
The SMCG33A-E3/57T 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 assumes no additional heatsinking and guides minimum copper area requirements for sustained power dissipation.
SMCG33A-E3/57T 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):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- 28.1A
- 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)
SMCG33A-E3/57T FAQ
1.How can I place an order for SMCG33A-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG33A-E3/57T 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 SMCG33A-E3/57T reliable?
The price and inventory of SMCG33A-E3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCG33A-E3/57T is usually 5 days.
3.What payment methods are accepted for SMCG33A-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG33A-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG33A-E3/57T?
SMCG33A-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG33A-E3/57T 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 SMCG33A-E3/57T?
For technical support, including SMCG33A-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG33A-E3/57T requirements.
6.How does Aetrix verify that SMCG33A-E3/57T is sourced from the original manufacturer or authorized distributors?
All SMCG33A-E3/57T 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 SMCG33A-E3/57T meets industry standards.
7.What is the process for return or replacement of SMCG33A-E3/57T?
All SMCG33A-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCG33A-E3/57T, 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 SMCG33A-E3/57T part is unused and in its original packaging.
Return procedure for SMCG33A-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCG33A-E3/57T Tags
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