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Vishay General Semiconductor - Diodes Division SMCG33-E3/57T
- Part No.:
- SMCG33-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG33-E3/57T.pdf
- Description:
- TVS DIODE 33VWM 59VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,778
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Product details
Overview
SMCG33-E3/57T from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) in the DO-215AB (SMCG) package, designed for clamping voltage transients on signal or power lines. It features a 33 V stand-off voltage (VWM), 1500 W peak pulse power (PPPM), and clamps to ≤53.3 V at 28.1 A IPPM under 10/1000 µs waveform - used in automotive sensor interface protection and industrial I/O line surge suppression.
For engineers reviewing the SMCG33-E3/57T datasheet, SMCG33-E3/57T pinout, SMCG33-E3/57T application, or SMCG33-E3/57T equivalent, key selection criteria include bi-directional clamping capability, AEC-Q101 qualification, DO-215AB thermal performance (RθJA = 75 °C/W), and compliance with UL 94 V-0 molding compound requirements.
Technical Context
The SMCG33-E3/57T implements a glass-passivated silicon avalanche junction optimized for fast response (<1 ns) to ESD and lightning-induced transients. Its bi-directional architecture enables symmetrical clamping without polarity sensitivity, supporting both AC-coupled and differential signal paths.
Rated for TJ = –55 °C to +150 °C operation, it delivers stable clamping across temperature with <1.0 µA reverse leakage at VWM and meets MSL Level 1 per J-STD-020 (260 °C peak reflow). The device is qualified to AEC-Q101 for automotive under-hood and chassis applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 33 V - maximum continuous reverse operating voltage before clamping initiates |
| VC @ IPPM | ≤53.3 V at 28.1 A - clamped voltage during 10/1000 µs surge, defining worst-case downstream voltage stress |
| PPPM | 1500 W - peak transient energy handling capacity under standardized 10/1000 µs waveform |
| TJ max. | +150 °C - maximum junction temperature enabling use in high-ambient automotive environments |
| RθJA | 75 °C/W - thermal resistance from junction to ambient on 8.0 mm × 8.0 mm copper pads, guiding PCB thermal layout |
| AEC-Q101 | Qualified - validated for automotive reliability including temperature cycling, HTRB, and ESD testing |
| UL 94 V-0 | Compliant - flammability rating of molding compound ensures safety in enclosed systems |
Pinout & Package
Package: DO-215AB (SMCG) - surface-mount, low-profile gull-wing leaded package with matte tin-plated terminals solderable per J-STD-002 and JESD 22-B102. Bi-directional construction means no polarity marking; both terminals are electrically symmetric.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetric) | Transient current path | Bi-directional conduction - either terminal serves as input/output; no cathode band marking |
| Leads (L1/L2) | Thermal and electrical interface | Gull-wing geometry supports automated placement and provides mechanical stability plus thermal conduction to PCB copper |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Enables single-device protection of AC signals, differential buses (e.g., CAN, RS-485), and ungrounded power rails without polarity concerns |
| 1500 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth, 2 kV line-line) when properly mounted on 8 mm × 8 mm copper pads |
| AEC-Q101 qualification | Validates suitability for automotive powertrain, body electronics, and ADAS sensor interfaces requiring long-term reliability at elevated temperatures |
| Glass-passivated junction | Ensures stable breakdown characteristics over time and humidity exposure, critical for industrial field-deployed equipment |
| MSL Level 1 rating | Permits standard SMT reflow without moisture-related popcorning, eliminating bake requirements prior to assembly |
Applications
| Automotive Sensor Interface | Industrial I/O Protection |
|---|---|
Use Scenario: Protecting analog outputs of pressure/temperature sensors connected to engine control units against load dump and ISO 7637-2 transients. IC Role / Device Role / Timing Role: Transient voltage suppressor placed directly at connector entry point to clamp spikes before reaching precision ADC front-end. Use Value: Limits voltage seen by downstream op-amps and ADCs to ≤53.3 V, preserving signal integrity and preventing latch-up during 100 A/10 ms surges. |
Use Scenario: Safeguarding PLC digital input channels exposed to 24 V DC field wiring subject to inductive switching noise and lightning coupling. IC Role / Device Role / Timing Role: Primary surge clamp on each channel's input node, coordinated with series current-limiting resistor and optocoupler isolation. Use Value: Absorbs up to 1500 W transient energy while maintaining ≤33 V stand-off, ensuring reliable logic-level recognition under repeated surge events. |
| Telecom Line Interface | Consumer USB Port Protection |
Use Scenario: Shielding Ethernet PHY differential pairs (e.g., 10/100BASE-TX) from ESD and induced surges in PoE-powered network switches. IC Role / Device Role / Timing Role: Bi-directional TVS placed across each twisted pair, leveraging symmetry to protect both polarities of differential signaling. Use Value: Clamps ±15 kV contact ESD (IEC 61000-4-2) within <1 ns while adding <0.5 pF parasitic capacitance - negligible impact on 100 MHz signal integrity. |
Use Scenario: Hardening USB 2.0 data lines (D+/D−) in portable media players against human-body-model ESD events during cable insertion. IC Role / Device Role / Timing Role: Low-capacitance bi-directional suppressor placed immediately after USB connector, upstream of USB transceiver ESD diodes. Use Value: Provides first-line defense with sub-1 ns response, reducing peak voltage to <53.3 V before internal IC-level protection activates - extending transceiver lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-E3/57T | Uni-directional; 33 V VWM; same PPPM (1500 W) but requires correct polarity orientation | Suitable only for DC-biased or ground-referenced lines; not usable on AC or floating differential signals | Select when polarity is fixed and board space allows discrete orientation marking; avoid for CAN/RS-485 |
| SMCJ33CA-E3/57T | Same bi-directional function and VWM; higher RθJA (85 °C/W vs. 75 °C/W); identical DO-214AB package | Lower thermal efficiency limits sustained surge duty cycle in high-ambient enclosures | Acceptable where thermal margin exists; verify derating per Fig. 2 if operating above 70 °C ambient |
Compared with SMAJ33A-E3/57T and SMCJ33CA-E3/57T, the SMCG33-E3/57T offers superior thermal performance (75 °C/W) in the smaller DO-215AB footprint and eliminates polarity constraints - making it optimal for space-constrained, high-reliability automotive and industrial designs requiring bi-directional robustness.
Availability
SMCG33-E3/57T is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line cards, and consumer USB port protection requiring stable component supply and AEC-Q101 assurance.
Supply support for SMCG33-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, TVS devices, and MOSFETs with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SMCG series is part of Vishay's TRANSZORB® TVS platform engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where AEC-Q101 compliance and UL safety certification are mandatory.
FAQ
What is the clamping voltage of SMCG33-E3/57T under a 10/1000 µs surge?
The SMCG33-E3/57T clamps to a maximum of 53.3 V when subjected to its rated peak pulse current of 28.1 A under the standardized 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 - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is SMCG33-E3/57T suitable for automotive applications?
Yes, SMCG33-E3/57T is AEC-Q101 qualified and explicitly rated for automotive use, including under-hood and chassis-mounted systems. Its –55 °C to +150 °C operating range, MSL Level 1 reflow compatibility, and validation across temperature cycling, HTRB, and ESD tests confirm suitability for engine control units, ADAS sensors, and body electronics where long-term reliability is essential.
Does SMCG33-E3/57T have polarity markings?
No, SMCG33-E3/57T is a bi-directional TVS and carries no polarity marking such as a cathode band. Both terminals are functionally identical, allowing installation in either orientation - a key advantage for protecting AC-coupled signals, differential buses like CAN or RS-485, and floating power domains where polarity cannot be assumed.
What is the thermal resistance of SMCG33-E3/57T, and how does it affect PCB layout?
The SMCG33-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. To achieve this rating, PCB layout must allocate minimum copper area per lead and avoid excessive thermal vias that disrupt current path symmetry - critical for maintaining clamping consistency during repetitive surges.
How does SMCG33-E3/57T compare to SMAJ33A-E3/57T in terms of surge handling?
Both SMCG33-E3/57T and SMAJ33A-E3/57T offer 1500 W peak pulse power and 33 V stand-off voltage, but SMCG33-E3/57T is bi-directional while SMAJ33A-E3/57T is uni-directional. This makes SMCG33-E3/57T capable of suppressing transients of either polarity without orientation dependency - a decisive advantage in differential or AC signal paths where SMAJ33A-E3/57T would require careful polarity alignment and additional design review.
SMCG33-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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 59V
- Current - Peak Pulse (10/1000µs):
- 25.4A
- 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)
SMCG33-E3/57T FAQ
1.How can I place an order for SMCG33-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG33-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 SMCG33-E3/57T reliable?
The price and inventory of SMCG33-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 SMCG33-E3/57T is usually 5 days.
3.What payment methods are accepted for SMCG33-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG33-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG33-E3/57T?
SMCG33-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG33-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 SMCG33-E3/57T?
For technical support, including SMCG33-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG33-E3/57T requirements.
6.How does Aetrix verify that SMCG33-E3/57T is sourced from the original manufacturer or authorized distributors?
All SMCG33-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 SMCG33-E3/57T meets industry standards.
7.What is the process for return or replacement of SMCG33-E3/57T?
All SMCG33-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCG33-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 SMCG33-E3/57T part is unused and in its original packaging.
Return procedure for SMCG33-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCG33-E3/57T Tags
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