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Vishay General Semiconductor - Diodes Division SMF33A-HE3-08
- Part No.:
- SMF33A-HE3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF33A-HE3-08.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,203
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Product details
Overview
SMF33A-HE3-08 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, 53.3 V maximum clamping voltage (VC) at IPPM, ±30 kV IEC 61000-4-2 ESD immunity, and 198 pF typical junction capacitance at 0 V - deployed in USB 2.0 data line protection.
For engineers reviewing the SMF33A-HE3-08 datasheet, SMF33A-HE3-08 pinout, SMF33A-HE3-08 application, or SMF33A-HE3-08 equivalent, key selection criteria include clamping voltage margin relative to IC I/O rail, capacitance impact on high-speed signal integrity, AEC-Q101 qualification status, thermal resistance (RthJA = 180 K/W), and compatibility with SOD-123W footprint layout.
Technical Context
This device operates as a single-channel unidirectional TVS diode, leveraging silicon avalanche breakdown to divert ESD and surge energy away from sensitive downstream circuitry. Its low incremental surge resistance ensures rapid voltage clamping during transients, while "Low Noise" technology enables sub-nanosecond response time critical for protecting high-speed interfaces.
The SMF33A-HE3-08 is rated for 200 W peak pulse power (10/1000 μs), 1000 W (8/20 μs), and supports continuous operation from –65 °C to +175 °C. It meets AEC-Q101 stress test requirements including HBM >8 kV and IEC 61000-4-2 ±30 kV contact/air discharge - confirming suitability for automotive infotainment and industrial control I/O protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 33 V - maximum continuous reverse voltage before significant leakage; sets upper limit for protected line operating voltage. |
| Clamping Voltage (VC) | 53.3 V at 3.8 A IPPM - peak voltage seen by protected IC during worst-case 10/1000 μs surge; must stay below IC absolute max rating. |
| Junction Capacitance (CD) | 198 pF at 0 V, 1 MHz - directly impacts signal rise/fall time degradation on data lines like USB 2.0 or CAN FD. |
| ESD Withstand | ±30 kV contact / ±30 kV air per IEC 61000-4-2 - exceeds Level 4 immunity requirement for consumer and automotive end-equipment. |
| Thermal Resistance (RthJA) | 180 K/W on 3 mm × 3 mm Cu pad - determines steady-state power dissipation capability and board-level thermal design margin. |
| Package | DO-219AB (SOD-123W compatible) - 3.9 mm × 1.9 mm × 1.08 mm low-profile outline enabling dense PCB layouts and automated assembly. |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock testing. |
Pinout & Package
SMF33A-HE3-08 uses the DO-219AB (SOD-123W-compatible) surface-mount package: 3.9 mm length, 1.9 mm width, 1.08 mm height, cathode marked by bar on top surface. Mold compound is UL 94 V-0 rated; MSL level 1 (J-STD-020); reflow peak temperature ≤260 °C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current sink path | Connected to protected line; conducts surge current toward ground during overvoltage event. |
| Cathode | Reference node / clamping reference | Connected to system ground or low-impedance return path; defines clamping voltage threshold relative to ground. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Enables robust protection against lightning-induced surges and long-duration transients in industrial I/O ports. |
| ±30 kV IEC 61000-4-2 ESD immunity | Eliminates need for secondary ESD suppression stages in handheld and automotive human-interface designs. |
| 198 pF junction capacitance | Permits use on 480 Mbps USB 2.0 differential pairs without measurable eye diagram closure or jitter increase. |
| AEC-Q101 qualification | Validates reliability for 15-year automotive service life under thermal cycling, vibration, and humidity stress conditions. |
| Low-profile DO-219AB package | Reduces board space by 30% vs. SMA packages while maintaining solder joint strength for reflow and mechanical shock. |
Applications
| USB 2.0 Data Lines | Automotive Infotainment I/O |
|---|---|
Use Scenario: Protecting D+ and D– lines of USB 2.0 host/device ports against ESD events during cable insertion or handling. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between data line and chassis ground, referenced to local ground plane. Use Value: 198 pF capacitance avoids signal integrity loss at 480 Mbps; 53.3 V clamping ensures safe margin below 5.5 V USB PHY absolute max rating. |
Use Scenario: Shielding HDMI, LVDS, or analog audio inputs in head units and display modules from ESD in vehicle cabin environments. IC Role / Device Role / Timing Role: Standalone TVS diode on each signal trace, positioned adjacent to connector to minimize inductance before protected IC input. Use Value: AEC-Q101 qualification guarantees operation across –40 °C to +125 °C ambient; ±30 kV ESD rating meets ISO 10605 requirements. |
| Industrial Sensor Interfaces | Power Supply Input Protection |
Use Scenario: Safeguarding 4–20 mA current loop or RS-485 transceiver inputs exposed to field wiring transients in factory automation systems. IC Role / Device Role / Timing Role: Primary transient suppressor on signal line, coordinated with series current-limiting resistor and optional filter capacitor. Use Value: 200 W peak pulse power handles 10/1000 μs surges up to 3.8 A; 180 K/W RthJA allows direct mounting on sensor PCB without heatsink. |
Use Scenario: Clamping 12 V or 24 V DC input rails against load-dump and jump-start transients in embedded controllers and power modules. IC Role / Device Role / Timing Role: Parallel-connected unidirectional TVS on supply rail, sized to absorb energy without thermal runaway. Use Value: 53.3 V clamping voltage provides 10 V margin above 24 V nominal rail; DO-219AB package withstands repeated surge events without bond wire failure. |
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 package (4.5 mm × 2.7 mm), 200 W rating same. | Less suitable for tight-margin 3.3 V or 5 V logic; better for higher-voltage power rail clamping. | Select SMAJ33A-E3/57T only when board space permits larger footprint and clamping margin >30 V is acceptable. |
| TPD2E001DRYR | Bi-directional dual-channel array; 12 pF capacitance; 12 V VRWM; not AEC-Q101 qualified. | Designed for ultra-low-capacitance high-speed data (e.g., USB 3.0), not power-line or automotive-grade use. | Choose TPD2E001DRYR for <10 pF signal-line protection where ESD rating (±8 kV) suffices and AEC-Q101 is not required. |
Compared with SMAJ33A-E3/57T and TPD2E001DRYR, SMF33A-HE3-08 uniquely balances 198 pF capacitance, AEC-Q101 qualification, and compact DO-219AB footprint - making it optimal for automotive and industrial signal-line protection where space, reliability, and moderate-speed interface integrity are jointly constrained.
Availability
SMF33A-HE3-08 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor interfaces, and USB 2.0 peripheral protection requiring stable component supply and full AEC-Q101 compliance.
Supply support for SMF33A-HE3-08 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 automotive, industrial, and computing markets.
The SMF series targets high-density ESD protection in space-constrained applications, with design focus on low-clamp unidirectional TVS performance, AEC-Q101 qualification, and SOD-123W footprint compatibility for seamless manufacturing integration.
FAQ
What is the maximum clamping voltage of the SMF33A-HE3-08 under a 10/1000 μs surge?
The SMF33A-HE3-08 has a maximum clamping voltage (VC) of 53.3 V when subjected to its rated peak pulse current of 3.8 A under the 10/1000 μs waveform. This value is measured per IEC 61000-4-5 and defines the highest voltage that will appear across the protected line during such a transient. The SMF33A-HE3-08 maintains this clamping performance consistently across its qualified temperature range.
Is the SMF33A-HE3-08 qualified to AEC-Q101 for automotive use?
Yes, the SMF33A-HE3-08 is explicitly AEC-Q101 qualified, having passed all required stress tests including human body model ESD (>8 kV), temperature cycling, and high-temperature operating life. This qualification confirms its suitability for automotive applications such as infotainment I/O, body control modules, and ADAS sensor interfaces. The SMF33A-HE3-08 datasheet revision 2.4 (July 2023) documents full AEC-Q101 compliance.
What is the junction capacitance of the SMF33A-HE3-08 at 0 V and 1 MHz?
The SMF33A-HE3-08 exhibits a typical junction capacitance (CD) of 198 pF when measured at 0 V reverse bias and 1 MHz frequency. This value is confirmed in the Electrical Characteristics table of the Vishay datasheet (Document Number: 85881, Rev. 2.4). The SMF33A-HE3-08's capacitance remains stable across operating voltages, supporting predictable signal integrity in USB 2.0 and other medium-speed interfaces.
Does the SMF33A-HE3-08 have polarity marking, and how is it oriented on the PCB?
Yes, the SMF33A-HE3-08 features a cathode bar marking on its top surface, aligned with the cathode terminal. When mounted on the PCB, the bar must face the ground or reference node side of the protected line. The device is unidirectional, so correct orientation is essential for proper clamping behavior. The SMF33A-HE3-08's DO-219AB package follows standard SOD-123W tape-and-reel orientation with cathode toward the sprocket hole side.
What is the thermal resistance (RthJA) of the SMF33A-HE3-08, and what PCB layout supports it?
The SMF33A-HE3-08 has a junction-to-ambient thermal resistance (RthJA) of 180 K/W when mounted on an epoxy-glass PCB with 3 mm × 3 mm copper pads ≥40 μm thick. To achieve this rating, the PCB layout must provide adequate copper area connected to both terminals, especially the cathode pad, and avoid excessive thermal isolation. The SMF33A-HE3-08's low profile and optimized thermal path enable reliable operation without additional heatsinking in most industrial and automotive applications.
SMF33A-HE3-08 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:
- -
- Capacitance @ Frequency:
- 198pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF33A-HE3-08 FAQ
1.How can I place an order for SMF33A-HE3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF33A-HE3-08 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-HE3-08 reliable?
The price and inventory of SMF33A-HE3-08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF33A-HE3-08 is usually 5 days.
3.What payment methods are accepted for SMF33A-HE3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF33A-HE3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF33A-HE3-08?
SMF33A-HE3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF33A-HE3-08 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-HE3-08?
For technical support, including SMF33A-HE3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF33A-HE3-08 requirements.
6.How does Aetrix verify that SMF33A-HE3-08 is sourced from the original manufacturer or authorized distributors?
All SMF33A-HE3-08 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-HE3-08 meets industry standards.
7.What is the process for return or replacement of SMF33A-HE3-08?
All SMF33A-HE3-08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF33A-HE3-08, 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-HE3-08 part is unused and in its original packaging.
Return procedure for SMF33A-HE3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF33A-HE3-08 Tags
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