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Vishay General Semiconductor - Diodes Division SMF33A-E3-18
- Part No.:
- SMF33A-E3-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF33A-E3-18.pdf
- Description:
- TVS DIODE 33VWM 53.3VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:51,042
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Product details
Overview
SMF33A-E3-18 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in the SMF (DO-219AB) package, designed for transient voltage suppression in high-speed data lines and power rails. It features a 33 V stand-off voltage (VRWM), 53.3 A peak pulse current (IPPM) under 10/1000 μs waveform, ±30 kV IEC 61000-4-2 ESD immunity, 198 pF typical capacitance at 0 V, and AEC-Q101 qualification for automotive use.
For engineers reviewing the SMF33A-E3-18 datasheet, SMF33A-E3-18 pinout, SMF33A-E3-18 application, or SMF33A-E3-18 equivalent, this device is selected for robust ESD hardening of USB 2.0, CAN FD, and automotive infotainment interfaces where low clamping voltage (<53.3 V), fast response time, and SOD-123W-compatible footprint are critical.
Technical Context
The SMF33A-E3-18 operates as a single-channel unidirectional TVS diode with avalanche breakdown behavior, triggered when reverse voltage exceeds its 36.7–40.6 V breakdown range (VBR). Its low incremental surge resistance enables tight clamping to ≤53.3 V at 3.8 A IPPM, minimizing stress on downstream ICs during transients.
Designed for PCB-level ESD protection, it leverages "Low Noise" technology for sub-nanosecond response and integrates into wave/reflow soldering processes per J-STD-020 MSL level 1. Its DO-219AB package supports thermal dissipation up to 180 K/W on standard epoxy-glass PCBs with 3 mm × 3 mm Cu pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 33 V - Maximum continuous reverse operating voltage before clamping begins; ensures no leakage or interference on 3.3 V/5 V/24 V signal/power lines. |
| Breakdown Voltage (VBR) | 36.7–40.6 V at 1 mA - Confirmed avalanche threshold range; defines minimum overvoltage required to initiate protection. |
| Peak Pulse Current (IPPM) | 3.8 A (10/1000 μs) - Sustains 3.8 A transient surges without failure; sufficient for IEC 61000-4-5 Level 3 (1 kV) line-to-ground events. |
| Clamping Voltage (VC) | 53.3 V max at IPPM - Limits voltage seen by protected IC to ≤53.3 V; critical for safeguarding 33 V-rated receivers and microcontrollers. |
| Capacitance (CD) | 198 pF at 0 V, 1 MHz - Low enough for USB 2.0 (480 Mbps) and CAN FD (5 Mbps) signal integrity; avoids data distortion or rise-time degradation. |
| ESD Rating | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - Meets highest industrial and automotive ESD immunity requirements without external shielding. |
| AEC-Q101 Qualified | Yes - Validated for automotive underhood and cabin applications including temperature cycling, humidity bias, and mechanical shock. |
Pinout & Package
SMF33A-E3-18 uses the DO-219AB (SOD-123W-compatible) surface-mount package: 3.9 mm × 1.9 mm × 1.08 mm, cathode-bar marked, single-diode configuration. The package is RoHS-compliant, lead-free, and rated for reflow up to 260 °C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side | Connected to signal or power line requiring protection; carries surge current into the diode during overvoltage events. |
| Cathode | Ground reference | Connected to system ground or low-impedance return path; establishes clamping reference and completes transient current path. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Enables reliable suppression of repetitive ESD and lightning-induced surges in industrial control and automotive gateways. |
| ±30 kV IEC 61000-4-2 ESD immunity | Eliminates need for secondary board-level shielding in touchscreens, sensors, and infotainment ports exposed to human interaction. |
| 198 pF capacitance at 0 V | Preserves signal integrity on high-speed interfaces like USB 2.0 and CAN FD without adding jitter or bit errors. |
| AEC-Q101 qualification | Validates reliability for automotive applications including engine control units, ADAS camera links, and body electronics modules. |
| DO-219AB low-profile package | Reduces PCB real estate vs. SMA/SMB; compatible with automated pick-and-place and high-density routing in compact ECUs. |
Applications
| Automotive Infotainment Display Interface | Industrial USB 2.0 Host Port |
|---|---|
Use Scenario: Protecting LVDS or eDP video data lanes between head unit MCU and TFT display panel in vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed inline on each differential pair to clamp ESD from connector handling and cable discharge. Use Value: Prevents latch-up or permanent damage to display driver ICs while maintaining <1 ns response and <53.3 V clamping under ±30 kV contact discharge. |
Use Scenario: Hardening USB 2.0 D+/D− lines on PLC controller front-panel host ports exposed to field technician ESD events. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional diode (cathode grounded) suppressing transients on both data lines simultaneously. Use Value: Maintains 480 Mbps signaling integrity with only 198 pF loading and passes full IEC 61000-4-2 testing without signal degradation. |
| Automotive CAN FD Node Protection | Smart Sensor Power Rail Clamp |
Use Scenario: Protecting CAN FD transceiver pins (CANH/CANL) in battery management systems against load dump and ESD coupling. IC Role / Device Role / Timing Role: Stand-alone TVS diode installed on each CAN line with ground reference, leveraging low clamping voltage to avoid bus fault. Use Value: Clamps to ≤53.3 V within nanoseconds, preventing transceiver overvoltage lockup and ensuring >99.9% bus uptime during EMC testing. |
Use Scenario: Safeguarding 3.3 V supply rail of MEMS pressure sensors in HVAC control modules subjected to board-level ESD. IC Role / Device Role / Timing Role: Unidirectional TVS connected between VDD and GND to shunt surge energy away from sensor analog front-end. Use Value: Blocks >8 kV HBM ESD pulses while drawing <0.1 μA leakage at 33 V, avoiding sensor offset drift or calibration loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-E3/57T | Same VRWM (33 V) and VC (53.3 V), but larger SMA package (4.5 mm × 2.7 mm); 200 W rating same, but RthJA = 130 K/W vs. 180 K/W. | Higher thermal resistance limits sustained surge duty cycle; less suitable for space-constrained automotive modules. | Choose SMAJ33A-E3/57T only if legacy SMA footprint exists and thermal derating is acceptable. |
| TPD2E001DRYR | 2-channel bidirectional array (0.85 pF/channel), lower VRWM (5.5 V), not AEC-Q101 qualified; designed for USB 2.0 data lines only. | Not rated for 33 V rail protection or automotive underhood environments; lacks ±30 kV ESD rating. | Use TPD2E001DRYR only for low-voltage, high-speed data lines where ultra-low capacitance is mandatory and automotive qualification is unnecessary. |
Compared with SMAJ33A-E3/57T and TPD2E001DRYR, SMF33A-E3-18 uniquely balances AEC-Q101 compliance, 33 V rail compatibility, 198 pF capacitance, and DO-219AB miniaturization-making it the optimal choice for next-generation automotive and industrial ESD-critical nodes.
Availability
SMF33A-E3-18 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial USB host interfaces, and CAN FD node designs requiring stable component supply, long-term lifecycle support, and AEC-Q101-qualified ESD protection.
Supply support for SMF33A-E3-18 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 Semiconductors is a global leader in discrete semiconductors, specializing in high-reliability diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.
The SMF series targets high-speed, space-constrained ESD protection applications-designed specifically for automotive infotainment, ADAS sensor interfaces, and industrial IoT edge nodes demanding AEC-Q101 validation and low-clamp performance.
FAQ
What is the maximum clamping voltage of SMF33A-E3-18 under peak pulse conditions?
The SMF33A-E3-18 has a maximum reverse clamping voltage (VC) of 53.3 V when subjected to its rated peak pulse current of 3.8 A (10/1000 μs waveform). This value is measured per IEC 61000-4-5 test conditions and ensures downstream ICs see no more than 53.3 V during transient events. The SMF33A-E3-18 achieves this clamping with low incremental surge resistance, making it effective for protecting 33 V-rated circuits.
Is SMF33A-E3-18 qualified for automotive applications?
Yes, SMF33A-E3-18 is AEC-Q101 qualified, having passed stress tests including temperature cycling, humidity bias, and mechanical shock per the AEC-Q101 standard. It is approved for use in automotive cabin and underhood applications such as infotainment displays, CAN FD nodes, and body control modules. The SMF33A-E3-18's -65 °C to +175 °C operating range and ±30 kV ESD rating further validate its suitability for automotive environments.
What package type does SMF33A-E3-18 use, and is it compatible with automated assembly?
SMF33A-E3-18 uses the DO-219AB (SOD-123W-compatible) surface-mount package: 3.9 mm × 1.9 mm × 1.08 mm, with cathode bar marking. It is fully compatible with wave and reflow soldering per J-STD-020 MSL level 1, supporting peak temperatures up to 260 °C. The SMF33A-E3-18's footprint matches industry-standard SOD-123W land patterns, enabling seamless integration into high-volume automated PCB assembly lines.
How does the capacitance of SMF33A-E3-18 affect high-speed signal integrity?
The SMF33A-E3-18 exhibits 198 pF typical capacitance at 0 V and 1 MHz, which is optimized for high-speed interfaces like USB 2.0 (480 Mbps) and CAN FD (5 Mbps). This value introduces negligible signal distortion or rise-time degradation when placed on properly terminated lines. The SMF33A-E3-18's low capacitance-combined with sub-nanosecond response-ensures ESD protection without compromising data fidelity, unlike higher-capacitance alternatives that risk bit errors.
What is the standoff voltage (VRWM) and why is it important for SMF33A-E3-18 selection?
The SMF33A-E3-18 has a maximum stand-off voltage (VRWM) of 33 V, meaning it remains non-conductive and draws <0.1 μA leakage current up to this DC or RMS voltage. This parameter ensures the SMF33A-E3-18 does not interfere with normal operation of 3.3 V, 5 V, 12 V, or 24 V circuits while providing robust clamping above that threshold. Selecting a VRWM closely matched to the system's operating voltage-such as 33 V for 24 V automotive rails-is essential to avoid false triggering or excessive leakage.
SMF33A-E3-18 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-219AB
- Series:
- eSMP®
- 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):
- 3.8A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 198pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF33A-E3-18 FAQ
1.How can I place an order for SMF33A-E3-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF33A-E3-18 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 SMF33A-E3-18 reliable?
The price and inventory of SMF33A-E3-18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF33A-E3-18 is usually 5 days.
3.What payment methods are accepted for SMF33A-E3-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF33A-E3-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF33A-E3-18?
SMF33A-E3-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF33A-E3-18 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 SMF33A-E3-18?
For technical support, including SMF33A-E3-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF33A-E3-18 requirements.
6.How does Aetrix verify that SMF33A-E3-18 is sourced from the original manufacturer or authorized distributors?
All SMF33A-E3-18 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 SMF33A-E3-18 meets industry standards.
7.What is the process for return or replacement of SMF33A-E3-18?
All SMF33A-E3-18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF33A-E3-18, 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 SMF33A-E3-18 part is unused and in its original packaging.
Return procedure for SMF33A-E3-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF33A-E3-18 Tags
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