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Vishay General Semiconductor - Diodes Division SMF33A-HM3-18
- Part No.:
- SMF33A-HM3-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF33A-HM3-18.pdf
- Description:
- TVS DIODE 33VWM 53.3VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:6,010
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Product details
Overview
SMF33A-HM3-18 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in the SMF (DO-219AB) package, designed for clamping transient overvoltages on data and signal 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 reverse clamping voltage (VC), and 198 pF typical junction capacitance at 1 MHz - optimized for high-speed USB 2.0, HDMI, and industrial I/O protection.
For engineers reviewing the SMF33A-HM3-18 datasheet, SMF33A-HM3-18 pinout, SMF33A-HM3-18 application, or SMF33A-HM3-18 equivalent, key selection criteria include clamping voltage margin relative to IC I/O rails, low capacitance for signal integrity, AEC-Q101 qualification status, and compatibility with SOD-123W footprint layouts.
Technical Context
This device operates as a single-channel unidirectional TVS diode, leveraging silicon avalanche breakdown to divert ESD transients away from sensitive downstream circuitry. Its low incremental surge resistance ensures rapid voltage clamping during ±30 kV IEC 61000-4-2 contact/air discharge events.
The SMF33A-HM3-18 is rated for continuous operation from −65 °C to +175 °C, with thermal resistance RthJA = 180 K/W on standard 3 mm × 3 mm Cu pads, and supports wave and reflow soldering per J-STD-020 MSL level 1 conditions (peak 260 °C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 33 V - maximum continuous reverse operating voltage before leakage exceeds 0.1 µA; sets upper limit for protected line voltage. |
| Breakdown Voltage (VBR) | 36.7–40.6 V at 1 mA - defines onset of avalanche conduction; ensures reliable triggering above system rail. |
| Clamping Voltage (VC) | 53.3 V at IPPM = 3.8 A (10/1000 µs) - peak voltage seen by protected IC during worst-case surge; critical for I/O voltage tolerance. |
| Junction Capacitance (CD) | 198 pF at VR = 0 V, f = 1 MHz - impacts signal rise time and insertion loss; suitable for ≤480 Mbps interfaces. |
| ESD Rating | ±30 kV contact / ±30 kV air per IEC 61000-4-2 - meets highest industrial and automotive ESD immunity requirements. |
| Peak Pulse Power | 200 W (10/1000 µs), 1000 W (8/20 µs) - defines energy-handling capability for lightning-induced surges and EFT bursts. |
| AEC-Q101 Qualified | Yes - validated for automotive electronics per stress test requirements including HBM >8 kV, ensuring reliability in harsh environments. |
Pinout & Package
SMF33A-HM3-18 uses the DO-219AB (SMF) package: low-profile, surface-mount, cathode-bar marked, compatible with SOD-123W footprint. Dimensions: 3.9 mm × 1.9 mm × 1.08 mm (L × W × H). Mold compound: UL 94 V-0 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/line side terminal | Connected to signal/data line requiring protection; conducts surge current toward cathode during overvoltage event. |
| Cathode | Ground reference terminal | Connected to system ground or low-impedance return path; establishes clamping reference and enables fast turn-on. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 µs) | Enables robust protection against repetitive ESD and surge events without degradation in compact PCB layouts. |
| "Low Noise" fast-response technology | Sub-nanosecond response time ensures clamping initiates before sensitive ICs experience overstress. |
| AEC-Q101 qualified | Validated for automotive applications including infotainment, ADAS sensor interfaces, and body control modules. |
| SOD-123W footprint compatibility | Allows drop-in replacement or layout reuse with widely adopted industry-standard land pattern. |
| ±30 kV IEC 61000-4-2 ESD immunity | Exceeds Level 4 requirements, eliminating need for external ESD staging in most industrial and consumer designs. |
Applications
| USB 2.0 Data Lines | HDMI Signal Pairs |
|---|---|
|
Use Scenario: Protecting D+ and D− lines in USB 2.0 host/device ports against ESD during hot-plug and handling. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between data line and chassis/system ground. Use Value: 198 pF capacitance preserves 480 Mbps signal integrity while clamping transients to ≤53.3 V - below USB PHY absolute max rating. |
Use Scenario: Safeguarding TMDS clock and data channels in HDMI 1.4 receivers against electrostatic discharge. IC Role / Device Role / Timing Role: Line-to-ground TVS on each differential pair, leveraging low capacitance to minimize skew and jitter. Use Value: 53.3 V clamping voltage provides ≥2.7 V margin above HDMI 1.4's 5 V DC common-mode range, preventing latch-up. |
| Automotive Sensor Interfaces | Industrial RS-485 Transceivers |
|
Use Scenario: Shielding LIN bus or analog sensor outputs (e.g., temperature, pressure) in engine control units and cabin modules. IC Role / Device Role / Timing Role: Single-line ESD suppressor on signal path from sensor to microcontroller ADC input. Use Value: AEC-Q101 qualification and −65 °C to +175 °C operating range ensure reliability across full automotive thermal envelope. |
Use Scenario: Protecting RS-485 driver/receiver pins in programmable logic controllers and factory automation gateways. IC Role / Device Role / Timing Role: Bidirectional protection implemented using two SMF33A-HM3-18 devices (anode-to-line, cathode-to-ground) per line. Use Value: 200 W pulse power rating handles induced surges from nearby motor switching or lightning coupling on long cable runs. |
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 (64.5 V), larger SMA package (4.5 mm × 2.7 mm), 300 W peak power (10/1000 µs) | Better suited for higher-energy surges but adds 120 pF capacitance - unsuitable for >100 Mbps interfaces | Select when surge energy exceeds 200 W and board space allows larger footprint. |
| TPD2E001DRYR | 2-channel, 15 pF, 12 V VRWM, integrated ESD array; not AEC-Q101 qualified | Designed for ultra-high-speed USB 3.0/MIPI; lacks automotive qualification and single-line flexibility | Choose for space-constrained, high-frequency digital interfaces where AEC-Q101 is not required. |
Compared with SMAJ33A-E3/57T and TPD2E001DRYR, SMF33A-HM3-18 uniquely balances low capacitance (198 pF), automotive qualification, and compact DO-219AB packaging - making it optimal for cost-sensitive, high-volume industrial and automotive signal-line protection where moderate speed and high reliability intersect.
Availability
SMF33A-HM3-18 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, automotive sensor I/O hardening, and industrial RS-485 transceiver safeguarding requiring stable component supply and long-term lifecycle support.
Supply support for SMF33A-HM3-18 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 signal line protection with AEC-Q101 qualification, low capacitance, and standardized SOD-123W-compatible packaging - addressing design needs in automotive infotainment, industrial connectivity, and consumer port hardening.
FAQ
What is the clamping voltage of SMF33A-HM3-18 at its rated peak pulse current?
The SMF33A-HM3-18 has a maximum reverse clamping voltage (VC) of 53.3 V at IPPM = 3.8 A under the 10/1000 µs waveform. This value is measured per IEC 61000-4-5 test conditions and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring compatibility with 3.3 V or 5 V logic I/O rails.
Is SMF33A-HM3-18 qualified to AEC-Q101 standards?
Yes, SMF33A-HM3-18 is AEC-Q101 qualified, having passed all required stress tests including human body model (HBM) ESD >8 kV, temperature cycling, and high-temperature operating life. This qualification confirms suitability for automotive applications such as body electronics, infotainment systems, and sensor interfaces where reliability under thermal and electrical stress is mandatory.
What package type does SMF33A-HM3-18 use, and is it compatible with automated assembly?
SMF33A-HM3-18 uses the DO-219AB (SMF) package - a low-profile, surface-mount outline measuring 3.9 mm × 1.9 mm × 1.08 mm. It is fully compatible with standard wave and reflow soldering processes per J-STD-020 MSL level 1, supporting peak temperatures up to 260 °C, and is designed for high-yield placement on automated SMT lines.
How does the 198 pF junction capacitance of SMF33A-HM3-18 affect high-speed signal integrity?
The 198 pF typical junction capacitance of SMF33A-HM3-18 at 0 V and 1 MHz imposes measurable loading on high-speed signals - limiting practical use to interfaces ≤480 Mbps (e.g., USB 2.0, CAN FD, RS-485). For faster protocols like USB 3.0 or HDMI 2.0, lower-capacitance alternatives are recommended; however, this value delivers optimal trade-off between ESD robustness and signal fidelity in cost-sensitive industrial and automotive designs.
Can SMF33A-HM3-18 be used for bidirectional signal line protection?
SMF33A-HM3-18 is a unidirectional TVS diode and is not inherently bidirectional. To protect AC-coupled or true bidirectional lines (e.g., RS-485), two SMF33A-HM3-18 devices must be configured in series opposition - anode of one tied to cathode of the other - with the common node connected to the signal line and both outer terminals referenced to ground. This configuration achieves symmetrical clamping.
SMF33A-HM3-18 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:
- -
- 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-HM3-18 FAQ
1.How can I place an order for SMF33A-HM3-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF33A-HM3-18 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-HM3-18 reliable?
The price and inventory of SMF33A-HM3-18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF33A-HM3-18 is usually 5 days.
3.What payment methods are accepted for SMF33A-HM3-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF33A-HM3-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF33A-HM3-18?
SMF33A-HM3-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF33A-HM3-18 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-HM3-18?
For technical support, including SMF33A-HM3-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF33A-HM3-18 requirements.
6.How does Aetrix verify that SMF33A-HM3-18 is sourced from the original manufacturer or authorized distributors?
All SMF33A-HM3-18 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-HM3-18 meets industry standards.
7.What is the process for return or replacement of SMF33A-HM3-18?
All SMF33A-HM3-18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF33A-HM3-18, 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-HM3-18 part is unused and in its original packaging.
Return procedure for SMF33A-HM3-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF33A-HM3-18 Tags
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