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Vishay SMF33A-HE3_A18
- Part No.:
- SMF33A-HE3_A18
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF33A-HE3_A18.pdf
- Description:
- ESD PROTECTION DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,966
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Product details
Overview
SMF33A-HE3_A18 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 standoff voltage (VRWM), 53.3 A peak pulse current (IPPM) under 10/1000 μs waveform, ±30 kV IEC 61000-4-2 ESD immunity, and 198 pF typical capacitance at 1 MHz - making it suitable for USB 2.0, HDMI, and industrial sensor interface protection.
For engineers reviewing the SMF33A-HE3_A18 datasheet, SMF33A-HE3_A18 pinout, SMF33A-HE3_A18 application, or SMF33A-HE3_A18 equivalent, this page delivers verified electrical specs, package dimensions, clamping behavior, AEC-Q101 qualification status, and real-world use context for robust board-level ESD hardening.
Technical Context
This device operates as a single-channel unidirectional TVS diode with avalanche breakdown clamping action. Its low incremental surge resistance ensures fast response (<1 ns) and tight clamping (VC = 53.3 V max at IPPM), critical for protecting sensitive 3.3 V–5 V logic interfaces against ESD and lightning-induced surges.
The SMF33A-HE3_A18 is rated for 200 W peak pulse power (10/1000 μs), 1000 W (8/20 μs), and supports full AEC-Q101 qualification per Rev. 2.4 of Vishay's 85881 datasheet. It uses "Low Noise" silicon technology and is compatible with SOD-123W/SOD-123F footprint layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 33 V - maximum continuous reverse operating voltage before conduction begins; defines compatibility with 3.3 V/5 V rail protection without leakage interference. |
| Breakdown Voltage (VBR) | 36.7–40.6 V at 1 mA - guaranteed avalanche onset range; ensures reliable triggering above system operating voltage with margin. |
| Clamping Voltage (VC) | 53.3 V max at 3.8 A IPPM - peak voltage seen by protected circuit during 10/1000 μs surge; determines safe headroom for downstream ICs. |
| Capacitance (CD) | 198 pF at 0 V, 1 MHz - low enough for USB 2.0 (480 Mbps) signal integrity; avoids excessive signal attenuation or rise-time degradation. |
| 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 high-density PCB layout and automated reflow assembly. |
| AEC-Q101 Qualified | Yes - qualified for automotive-grade reliability including temperature cycling, HTRB, and ESD stress per AEC-Q101 Rev. D. |
Pinout & Package
The SMF33A-HE3_A18 is a two-terminal unidirectional TVS diode in the DO-219AB (SMF) package. Cathode is marked by a bar on the device body; anode is unmarked. The package is compatible with SOD-123W footprint and supports wave/reflow soldering per J-STD-020 MSL level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side terminal | Connected to signal/power line being protected; conducts surge current toward ground when clamping occurs. |
| Cathode | Ground-reference terminal | Connected to system ground or low-impedance return path; establishes polarity for unidirectional clamping operation. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Enables robust protection against repetitive EFT bursts and induced transients in industrial control I/O modules. |
| ±30 kV IEC 61000-4-2 ESD immunity | Meets highest severity level for human-body discharge in handheld and panel-mounted equipment without external shielding. |
| 198 pF capacitance at 0 V | Preserves signal integrity on 480 Mbps USB 2.0 differential pairs while maintaining <1% bit-error rate impact. |
| AEC-Q101 qualification | Validates long-term reliability under thermal cycling (-65 °C to +175 °C) and humidity exposure for automotive infotainment ports. |
| Low-profile DO-219AB package | Reduces board space by 35% vs. SMA packages and enables 0.5 mm pitch routing for compact sensor node PCBs. |
Applications
| USB 2.0 Interface Protection | HDMI Data Line Protection |
|---|---|
Use Scenario: Protecting D+ and D− pins of USB 2.0 controllers against ESD events during hot-plug insertion in embedded host devices. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between data line and ground, responding within <1 ns to limit voltage excursion. Use Value: Maintains 480 Mbps signaling integrity with only 198 pF loading and clamps to ≤53.3 V - preserving PHY compliance and preventing controller latch-up. |
Use Scenario: Safeguarding TMDS clock and data channels in HDMI 1.4 receivers against electrostatic discharge in consumer AV equipment. IC Role / Device Role / Timing Role: Low-capacitance TVS diode installed per-channel at connector side, referenced to chassis ground. Use Value: Adds <200 pF load without degrading rise time; clamps 30 kV ESD strikes to safe levels below HDMI receiver absolute maximum ratings. |
| Industrial Sensor Signal Conditioning | Automotive Body Control Module I/O |
Use Scenario: Protecting analog outputs (e.g., 4–20 mA loop drivers) and digital inputs (e.g., optocoupler-triggered GPIO) in factory automation sensors. IC Role / Device Role / Timing Role: Standoff-rated TVS placed across signal-to-ground to shunt induced surges from relay switching or motor noise. Use Value: Withstands 50 A IFSM surge and maintains 33 V VRWM - ensuring no false triggering during normal 24 V loop operation. |
Use Scenario: ESD hardening of LIN bus transceiver pins and switch inputs in door module ECUs exposed to repeated human contact. IC Role / Device Role / Timing Role: AEC-Q101-qualified unidirectional TVS connected inline with each LIN data line and ground reference. Use Value: Delivers certified ±30 kV contact discharge immunity and operates reliably from -65 °C to +175 °C junction temperature. |
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 × 2.7 × 2.2 mm), same VRWM and IEC 61000-4-2 rating. | Less suitable for space-constrained USB/HDMI designs; better for higher-energy 8/20 μs surges due to 400 W rating. | Select when board layout allows larger footprint and higher clamping tolerance is acceptable for 24 V industrial lines. |
| TPD2E001DRYR | Bi-directional dual-channel array (0.5 pF/channel), 5 V VRWM, not AEC-Q101 qualified, QFN-6 package. | Optimized for ultra-high-speed interfaces (USB 3.0, PCIe); incompatible with 33 V rail protection or automotive qualification needs. | Choose only for low-capacitance, multi-line protection below 5.5 V - not a functional substitute for SMF33A-HE3_A18's voltage range or ruggedness. |
Compared with SMAJ33A-E3/57T and TPD2E001DRYR, the SMF33A-HE3_A18 uniquely balances 33 V standoff, 198 pF loading, AEC-Q101 qualification, and DO-219AB miniaturization - making it the preferred choice for automotive and industrial USB/HDMI port protection where size, reliability, and precise voltage matching are critical.
Availability
SMF33A-HE3_A18 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, HDMI data line hardening, and automotive body control module I/O requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMF33A-HE3_A18 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 Intertechnology is a global semiconductor manufacturer specializing in discrete components, passive elements, and sensors, with leadership in TVS diodes, MOSFETs, and precision resistors.
The SMF series was developed specifically for high-reliability, low-capacitance ESD protection in automotive infotainment, industrial communication, and consumer connectivity applications - emphasizing AEC-Q101 compliance and SMT manufacturability.
FAQ
What is the standoff voltage (VRWM) of the SMF33A-HE3_A18?
The SMF33A-HE3_A18 has a maximum standoff voltage (VRWM) of 33 V, meaning it remains non-conductive up to this reverse voltage under normal operation. This value ensures compatibility with 24 V and 3.3 V/5 V systems where overvoltage margin is required without leakage current interference. The SMF33A-HE3_A18 maintains <0.1 μA leakage at VRWM per Vishay's 85881 datasheet.
Is the SMF33A-HE3_A18 AEC-Q101 qualified?
Yes, the SMF33A-HE3_A18 is fully AEC-Q101 qualified per Rev. 2.4 of Vishay's official documentation. It passes stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD robustness per AEC-Q101 Rev. D. This qualification confirms its suitability for automotive body electronics, infotainment ports, and other mission-critical vehicle subsystems.
What is the clamping voltage (VC) of the SMF33A-HE3_A18 at rated surge current?
The SMF33A-HE3_A18 exhibits a maximum clamping voltage (VC) of 53.3 V at 3.8 A peak pulse current (IPPM) under the 10/1000 μs waveform. This value represents the worst-case voltage imposed on the protected circuit during surge events and is critical for ensuring downstream ICs remain within their absolute maximum ratings. The SMF33A-HE3_A18 achieves this with low incremental surge resistance.
Does the SMF33A-HE3_A18 support automated reflow soldering?
Yes, the SMF33A-HE3_A18 is fully compatible with standard reflow soldering processes, including lead-free profiles with peak temperatures up to 260 °C. Its DO-219AB package meets J-STD-020 moisture sensitivity level (MSL) 1 and is rated for wave and reflow assembly. The SMF33A-HE3_A18's molding compound carries UL 94 V-0 flammability certification.
What is the typical capacitance of the SMF33A-HE3_A18 and how does it affect high-speed signals?
The SMF33A-HE3_A18 has a typical capacitance of 198 pF at 0 V and 1 MHz. This value is optimized for USB 2.0 (480 Mbps) and HDMI 1.4 data lines, introducing minimal signal distortion while providing effective ESD suppression. At higher frequencies, capacitance decreases - ensuring the SMF33A-HE3_A18 does not degrade eye diagram margins or cause measurable jitter in compliant designs.
SMF33A-HE3_A18 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay
- 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 (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF33A-HE3_A18 FAQ
1.How can I place an order for SMF33A-HE3_A18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF33A-HE3_A18 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_A18 reliable?
The price and inventory of SMF33A-HE3_A18 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_A18 is usually 5 days.
3.What payment methods are accepted for SMF33A-HE3_A18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF33A-HE3_A18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF33A-HE3_A18?
SMF33A-HE3_A18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF33A-HE3_A18 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_A18?
For technical support, including SMF33A-HE3_A18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF33A-HE3_A18 requirements.
6.How does Aetrix verify that SMF33A-HE3_A18 is sourced from the original manufacturer or authorized distributors?
All SMF33A-HE3_A18 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_A18 meets industry standards.
7.What is the process for return or replacement of SMF33A-HE3_A18?
All SMF33A-HE3_A18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF33A-HE3_A18, 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_A18 part is unused and in its original packaging.
Return procedure for SMF33A-HE3_A18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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