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Vishay SMF28A-HM3_A18
- Part No.:
- SMF28A-HM3_A18
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF28A-HM3_A18.pdf
- Description:
- ESD PROTECTION DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,580
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Product details
Overview
SMF28A-HM3_A18 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in the SMF (DO-219AB) package, designed for robust transient voltage suppression in high-speed data lines. It features a 28 V standoff voltage, 45.4 A peak pulse current (10/1000 μs), 45.4 V maximum clamping voltage at IPPM, ±30 kV IEC 61000-4-2 ESD immunity, and 227 pF typical capacitance at 0 V - ideal for USB 2.0, HDMI, and industrial sensor interface protection.
For engineers reviewing the SMF28A-HM3_A18 datasheet, SMF28A-HM3_A18 pinout, SMF28A-HM3_A18 application, or SMF28A-HM3_A18 equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, SOD-123W-compatible packaging details, thermal resistance (180 K/W), and real-world use cases aligned with IEC 61000-4-2/4-5 and AEC-Q101 Class H3B requirements.
Technical Context
This device operates as a single-channel unidirectional TVS diode, leveraging silicon avalanche technology to clamp transients above its 31.1–34.4 V breakdown range. Its low incremental surge resistance enables fast response (<1 ns rise time per IEC 61000-4-2) and stable clamping under repetitive 10/1000 μs surges up to 200 W.
Designed for board-level ESD hardening, it supports wave and reflow soldering per J-STD-020 MSL level 1, with a 1.08 mm max height and 3.9 × 1.9 mm footprint compatible with SOD-123W layout patterns. The cathode-bar marking and DO-219AB outline ensure unambiguous orientation during automated assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 28 V - defines maximum continuous operating voltage before clamping begins |
| Breakdown Voltage (VBR) | 31.1–34.4 V at 1 mA - ensures reliable triggering margin above VRWM |
| Clamping Voltage (VC) | 45.4 V at 4.4 A (10/1000 μs) - limits downstream IC stress during surge events |
| Peak Pulse Power | 200 W (10/1000 μs) - sustains short-duration transients without failure |
| Capacitance (CD) | 227 pF at 0 V, 1 MHz - suitable for <100 Mbps signal lines with minimal distortion |
| ESD Rating | ±30 kV contact/air (IEC 61000-4-2) - exceeds automotive and industrial immunity requirements |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including HBM >8 kV |
Pinout & Package
SMF28A-HM3_A18 uses the DO-219AB (SMF) package: low-profile (1.08 mm max height), 3.9 mm × 1.9 mm footprint, molded UL 94 V-0 compound, MSL level 1, and cathode-bar polarity marking. Compatible with SOD-123W PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/protected line connection | Connected to signal line requiring ESD protection; referenced to ground via cathode |
| Cathode | Ground reference terminal | Must be tied to low-impedance system ground to enable clamping action during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise fast response | Sub-nanosecond turn-on enables effective suppression of ESD pulses per IEC 61000-4-2 |
| Reflow/wave solder compatible | Rated for peak temperatures up to 260 °C - supports standard SMT assembly processes |
| High surge current capability | 4.4 A peak pulse current (10/1000 μs) maintains clamping integrity across multiple transients |
| Automotive-qualified reliability | AEC-Q101 qualified with H3B-class HBM (>8 kV) - suitable for under-hood and infotainment systems |
| Low-profile packaging | 1.08 mm height enables use in space-constrained portable and automotive modules |
Applications
| USB 2.0 Interface Protection | HDMI Signal Line Protection |
|---|---|
Use Scenario: Protecting D+ and D− differential pairs in USB 2.0 ports against ESD events during hot-plug insertion. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between signal line and ground to clamp transients before reaching USB transceiver. Use Value: 227 pF capacitance avoids signal integrity degradation at 480 Mbps; ±30 kV ESD rating prevents port lockup or PHY damage. | Use Scenario: Safeguarding TMDS clock and data channels in HDMI 1.4 receivers from electrostatic discharge during cable mating. IC Role / Device Role / Timing Role: Single-channel transient suppressor on each TMDS line, referenced to chassis ground. Use Value: 45.4 V clamping voltage stays below HDMI receiver absolute maximum ratings; DO-219AB footprint fits tight pitch layouts. |
| Industrial Sensor Interface | Automotive LIN Bus Node |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA or 0–10 V) of pressure/temperature sensors in factory automation equipment. IC Role / Device Role / Timing Role: Standoff-limited TVS protecting signal conditioning circuitry from field-induced surges and handling ESD during maintenance. Use Value: 28 V VRWM matches common industrial supply rails; 180 K/W thermal resistance allows operation at full rating on standard FR-4. | Use Scenario: Providing ESD resilience on LIN bus transceivers in body control modules exposed to service technician contact. IC Role / Device Role / Timing Role: Unidirectional clamp on LIN line (single-wire bus), grounded at node end to limit voltage excursion during fault conditions. Use Value: AEC-Q101 qualification ensures lifetime reliability in automotive environments; 31.1–34.4 V VBR avoids false triggering during load dump transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28A-E3/5A | Higher clamping voltage (49.9 V), larger SMA (DO-214AC) package, 400 W peak power | Better suited for higher-energy surges but less space-efficient; higher capacitance (350 pF) | Select when surge energy exceeds 200 W and board area permits larger footprint |
| TPD2E001DRYR | 2-channel, 15 pF ultra-low capacitance, 5.5 V VRWM, not AEC-Q101 qualified | Optimized for high-speed digital interfaces (e.g., USB 3.0, MIPI), not automotive-grade | Choose for low-capacitance, multi-line protection where AEC-Q101 is not required |
Compared with SMAJ28A-E3/5A and TPD2E001DRYR, SMF28A-HM3_A18 uniquely balances AEC-Q101 compliance, compact DO-219AB packaging, and 227 pF capacitance - making it optimal for space-constrained automotive and industrial data line protection where moderate speed and high reliability are both essential.
Availability
SMF28A-HM3_A18 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, HDMI signal line hardening, and automotive LIN bus node designs requiring stable component supply and long-term lifecycle support.
Supply support for SMF28A-HM3_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 Semiconductors is a global leader in discrete semiconductors, specializing in power management, sensing, and protection components with emphasis on reliability and precision.
The SMF series targets board-level ESD and surge protection in automotive, industrial, and consumer electronics - engineered for high immunity, low profile, and seamless integration into automated SMT lines.
FAQ
What is the standoff voltage rating of SMF28A-HM3_A18?
The SMF28A-HM3_A18 has a maximum standoff voltage (VRWM) of 28 V, meaning it remains non-conductive under normal operating conditions up to this DC or RMS voltage. This value is confirmed in the Electrical Characteristics table of Vishay's Document Number 85881, ensuring compatibility with 24 V industrial buses and LIN networks. The SMF28A-HM3_A18 triggers clamping only when transient voltages exceed its 31.1–34.4 V breakdown range.
Is SMF28A-HM3_A18 qualified for automotive applications?
Yes, SMF28A-HM3_A18 is AEC-Q101 qualified and rated for human body model (HBM) Class H3B (>8 kV), meeting stringent automotive reliability standards. Its construction, testing, and packaging comply with AEC-Q101 requirements for temperature cycling, humidity, and mechanical shock. The SMF28A-HM3_A18 is explicitly listed in Vishay's qualified parts documentation for under-hood and cabin electronics use.
What is the clamping voltage of SMF28A-HM3_A18 at its rated peak pulse current?
The SMF28A-HM3_A18 exhibits a maximum clamping voltage (VC) of 45.4 V at its rated peak pulse current of 4.4 A (10/1000 μs waveform). This value is measured per IEC 61000-4-5 test conditions and guarantees that downstream ICs experience no more than 45.4 V during surge events. The SMF28A-HM3_A18 achieves this with low incremental surge resistance, critical for protecting sensitive transceivers.
Does SMF28A-HM3_A18 support automated SMT assembly?
Yes, SMF28A-HM3_A18 is fully compatible with standard reflow and wave soldering processes. It is rated for peak temperatures up to 260 °C per J-STD-020, classified as MSL level 1, and features a DO-219AB outline optimized for pick-and-place accuracy. The cathode-bar marking and symmetric footprint simplify optical recognition and placement verification - all confirmed in Vishay's package drawing S8-V-3915.01-001 for SMF28A-HM3_A18.
What is the typical junction capacitance of SMF28A-HM3_A18 at 0 V bias?
The SMF28A-HM3_A18 has a typical junction capacitance (CD) of 227 pF at 0 V reverse bias and 1 MHz, as specified in Vishay's Electrical Characteristics table. This value is measured under standardized conditions and directly impacts signal integrity in high-speed interfaces - for example, limiting usable bandwidth in USB 2.0 applications while remaining acceptable for HDMI 1.4 clock lines. The SMF28A-HM3_A18's capacitance is stable across temperature and voltage ranges per Figure 5 in Document 85881.
SMF28A-HM3_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):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 4.4A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 227pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF28A-HM3_A18 FAQ
1.How can I place an order for SMF28A-HM3_A18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF28A-HM3_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 SMF28A-HM3_A18 reliable?
The price and inventory of SMF28A-HM3_A18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF28A-HM3_A18 is usually 5 days.
3.What payment methods are accepted for SMF28A-HM3_A18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF28A-HM3_A18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF28A-HM3_A18?
SMF28A-HM3_A18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF28A-HM3_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 SMF28A-HM3_A18?
For technical support, including SMF28A-HM3_A18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF28A-HM3_A18 requirements.
6.How does Aetrix verify that SMF28A-HM3_A18 is sourced from the original manufacturer or authorized distributors?
All SMF28A-HM3_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 SMF28A-HM3_A18 meets industry standards.
7.What is the process for return or replacement of SMF28A-HM3_A18?
All SMF28A-HM3_A18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF28A-HM3_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 SMF28A-HM3_A18 part is unused and in its original packaging.
Return procedure for SMF28A-HM3_A18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF28A-HM3_A18 Tags
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