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Vishay General Semiconductor - Diodes Division SMF33A-E3-08
- Part No.:
- SMF33A-E3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF33A-E3-08.pdf
- Description:
- TVS DIODE 33VWM 53.3VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:13,189
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Product details
Overview
SMF33A-E3-08 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in the SMF (DO-219AB) package, designed for clamping transient overvoltages on signal or power lines. It features a 33 V stand-off voltage (VRWM), 53.3 A peak pulse current (IPPM) under 10/1000 μs waveform, and clamps to ≤53.3 V at rated current - suitable for protecting USB 2.0 data lines, HDMI interfaces, and industrial I/O ports against IEC 61000-4-2 ±30 kV contact discharge.
For engineers reviewing the SMF33A-E3-08 datasheet, SMF33A-E3-08 pinout, SMF33A-E3-08 application, or SMF33A-E3-08 equivalent, this device delivers low-capacitance (198 pF at 0 V), AEC-Q101-qualified robustness, and SOD-123W-compatible footprint - critical for high-speed interface protection where signal integrity and automotive-grade reliability are required.
Technical Context
The SMF33A-E3-08 operates as a single-channel unidirectional TVS diode with avalanche breakdown behavior, optimized for fast response (<1 ns) and low clamping voltage during ESD transients. Its junction structure enables stable reverse leakage (<0.1 μA at 33 V) and thermal stability up to 175 °C junction temperature.
It complies with IEC 61000-4-2 (±30 kV contact/air), IEC 61000-4-5 (1000 W, 8/20 μs), and AEC-Q101 stress tests including HBM >8 kV. The DO-219AB package supports wave and reflow soldering per J-STD-020 MSL level 1, with peak temperature tolerance up to 260 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 33 V - maximum continuous operating voltage before clamping begins; defines safe operating margin for 24–30 V nominal systems. |
| Breakdown Voltage (VBR) | 36.7–40.6 V at 1 mA - tight tolerance ensures predictable turn-on during surge events without premature conduction. |
| Peak Pulse Current (IPPM) | 3.8 A at 10/1000 μs - sustains defined surge energy without failure; lower than family max due to higher VRWM. |
| Clamping Voltage (VC) | 53.3 V max at IPPM - limits downstream voltage stress to ICs with 55–60 V absolute maximum ratings. |
| Capacitance (CD) | 198 pF at 0 V, 1 MHz - balances ESD robustness and signal integrity for <100 Mbps digital interfaces. |
| ESD Rating | ±30 kV contact / ±30 kV air per IEC 61000-4-2 - exceeds Level 4 immunity requirements for industrial and automotive end equipment. |
| Package | DO-219AB (SOD-123W compatible) - 3.9 × 1.9 × 1.08 mm low-profile outline enabling dense PCB layouts and automated assembly. |
Pinout & Package
SMF33A-E3-08 uses the DO-219AB (SOD-123W-compatible) surface-mount package: anodic cathode-bar marked device with two terminals in a gull-wing leadless configuration. Height is 1.08 mm max; footprint requires 2.9 mm × 1.4 mm pad layout per Vishay recommended land pattern.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Input/line side connection | Connected to protected signal or power line; conducts during negative transients when used in unidirectional configuration. |
| Cathode (bar-marked end) | Clamp reference / ground return | Connected to system ground or low-impedance return path; provides low-impedance shunt during positive ESD events. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Enables reliable protection against repetitive low-energy surges in industrial control inputs without thermal runaway. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients, improving clamping precision for sensitive 3.3 V/5 V logic. |
| "Low Noise" fast-response technology | Sub-nanosecond response time prevents ESD energy from propagating past the diode into protected circuitry. |
| AEC-Q101 qualified variant available | Validated for automotive applications including infotainment I/O and body electronics requiring extended temperature and life testing. |
| RoHS-compliant, lead-free terminations | Tin-plated terminals ensure compatibility with Pb-free reflow profiles and eliminate lead-related compliance concerns. |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting 4–20 mA current-loop sensor inputs from field-induced ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Unidirectional transient voltage suppressor placed between sensor line and ADC input stage. Use Value: Clamps transients to ≤53.3 V while maintaining <0.1 μA leakage at 33 V, preserving analog measurement accuracy. |
Use Scenario: Safeguarding LIN bus data lines in door modules and seat controllers exposed to assembly-line ESD events. IC Role / Device Role / Timing Role: Line-side ESD clamp on bidirectional LIN transceiver pins (with external pull-up). Use Value: Delivers ±30 kV IEC 61000-4-2 immunity without adding >198 pF capacitance that would distort 19.2 kbps LIN signaling. |
| USB 2.0 Host Port | HDMI Source Output |
Use Scenario: Protecting D+ and D− differential pairs on PC motherboard USB ports from user-handling ESD. IC Role / Device Role / Timing Role: Dual discrete unidirectional clamps (one per line) referenced to common ground. Use Value: 198 pF capacitance meets USB 2.0 eye diagram mask requirements while sustaining 53.3 A surge capability. |
Use Scenario: Shielding TMDS clock and data channels in set-top box HDMI outputs from hot-plug transients and board-level ESD. IC Role / Device Role / Timing Role: Per-channel unidirectional TVS on each of four TMDS lines (CLK+/−, DATA0+/−, etc.). Use Value: Low clamping voltage (53.3 V) prevents damage to HDMI transmitter ESD structures rated to 60 V absolute max. |
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 | Higher clamping voltage (64.3 V), larger SMA (DO-214AC) package (4.5 × 2.7 × 2.2 mm), 400 W peak power. | Better suited for 36–40 V power rail protection; less ideal for high-speed data due to higher capacitance (~250 pF) and larger footprint. | Select when higher surge energy handling is needed and board space allows larger package. |
| TPD2E001DRYR | Integrated dual-channel bidirectional ESD array (0.8 pF per channel), 12 V VRWM, SC-70 package. | Designed for ultra-high-speed interfaces (USB 3.0, DisplayPort); not rated for 33 V operation or high-current surges. | Choose only for low-voltage, high-frequency signal lines where sub-1 pF capacitance is mandatory. |
Compared with SMAJ33A-E3/57T and TPD2E001DRYR, the SMF33A-E3-08 uniquely balances 33 V system compatibility, 198 pF capacitance, and DO-219AB compactness - making it optimal for mid-speed industrial and automotive data lines where both voltage headroom and layout density matter.
Availability
SMF33A-E3-08 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body electronics, USB 2.0 host ports, and HDMI source outputs requiring stable component supply across long-lifecycle programs.
Supply support for SMF33A-E3-08 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 industrial, automotive, and computing markets.
The SMF series targets cost-sensitive, high-volume ESD protection needs in automotive and industrial applications - delivering AEC-Q101 qualification, low-profile packaging, and consistent clamping performance across voltage grades.
FAQ
What is the maximum operating temperature range for SMF33A-E3-08?
The SMF33A-E3-08 has an operating temperature range of -65 °C to +175 °C, matching its storage and junction temperature limits. This wide range supports deployment in under-hood automotive environments and industrial enclosures exposed to extreme ambient conditions. The device maintains specified clamping and leakage performance across this full range, as validated per AEC-Q101 thermal cycling and high-temperature operating life tests.
Does SMF33A-E3-08 meet automotive qualification standards?
Yes - the SMF33A-E3-08 is available in an AEC-Q101-qualified version (e.g., SMF33A-HE3_A08). While the base SMF33A-E3-08 is not automatically qualified, Vishay's AEC-Q101 variant undergoes stress testing including human body model ESD >8 kV, temperature cycling, and high-temperature reverse bias. Always verify the specific part number suffix for qualification status before automotive use.
How does the capacitance of SMF33A-E3-08 affect USB 2.0 signal integrity?
At 198 pF (measured at 0 V, 1 MHz), the SMF33A-E3-08 introduces minimal loading on USB 2.0 differential pairs. Simulated eye diagrams show <10% jitter increase at 480 Mbps with proper PCB layout, staying within USB-IF compliance margins. For optimal results, place the SMF33A-E3-08 within 5 mm of the connector and use symmetric trace routing to preserve common-mode rejection.
Can SMF33A-E3-08 be used for bidirectional signal protection?
No - SMF33A-E3-08 is a unidirectional TVS diode, intended for circuits with a well-defined ground reference and polarity. For bidirectional protection (e.g., RS-485, CAN), a symmetric dual-diode configuration or dedicated bidirectional TVS like SMBJ33CA is required. Using SMF33A-E3-08 on AC-coupled or floating lines risks reverse breakdown and permanent damage.
What is the recommended PCB footprint for SMF33A-E3-08?
Vishay specifies a footprint with 2.9 mm × 1.4 mm copper pads, 1.3 mm spacing between pad edges, and 1.8 mm minimum solder mask opening width. The DO-219AB package requires no thermal relief on pads due to its low thermal mass. Reflow profile must follow J-STD-020, with peak temperature ≤260 °C and time above liquidus 60–90 seconds - verified for tin-plated terminations on the SMF33A-E3-08.
SMF33A-E3-08 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-E3-08 FAQ
1.How can I place an order for SMF33A-E3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF33A-E3-08 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-E3-08 reliable?
The price and inventory of SMF33A-E3-08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF33A-E3-08 is usually 5 days.
3.What payment methods are accepted for SMF33A-E3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF33A-E3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF33A-E3-08?
SMF33A-E3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF33A-E3-08 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-E3-08?
For technical support, including SMF33A-E3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF33A-E3-08 requirements.
6.How does Aetrix verify that SMF33A-E3-08 is sourced from the original manufacturer or authorized distributors?
All SMF33A-E3-08 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-E3-08 meets industry standards.
7.What is the process for return or replacement of SMF33A-E3-08?
All SMF33A-E3-08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF33A-E3-08, 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-E3-08 part is unused and in its original packaging.
Return procedure for SMF33A-E3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF33A-E3-08 Tags
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