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Vishay SMF28A-HE3_A18
- Part No.:
- SMF28A-HE3_A18
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF28A-HE3_A18.pdf
- Description:
- ESD PROTECTION DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,434
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Product details
Overview
SMF28A-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. It features a 28 V standoff voltage (VRWM), 31.1–34.4 V breakdown range (VBR), 4.4 A peak pulse current (IPPM), 45.4 V clamping voltage (VC), and 227 pF capacitance at 0 V - optimized for USB 2.0, HDMI, and industrial I/O protection.
For engineers reviewing the SMF28A-HE3_A18 datasheet, SMF28A-HE3_A18 pinout, SMF28A-HE3_A18 application, or SMF28A-HE3_A18 equivalent, this device delivers AEC-Q101 qualification, ±30 kV IEC 61000-4-2 ESD immunity, low 1.08 mm profile, and SOD-123W-compatible mounting - critical for space-constrained automotive and industrial PCBs requiring robust overvoltage resilience.
Technical Context
This unidirectional TVS diode operates as a clamping device in reverse-biased configuration, activating above its 28 V working voltage to shunt surge energy away from sensitive circuitry. Its low 227 pF junction capacitance minimizes signal distortion on 480 Mbps USB 2.0 lines, while the 45.4 V clamping voltage ensures downstream ICs remain within safe operating limits during 10/1000 μs transients.
The SMF28A-HE3_A18 leverages Vishay's "Low Noise" silicon technology for sub-nanosecond response time and achieves 200 W peak pulse power (10/1000 μs) with only 180 K/W junction-to-ambient thermal resistance when mounted on standard 3 mm × 3 mm Cu pads - enabling reliable operation up to 175 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 28 V - maximum continuous reverse voltage before clamping begins; sets operating margin for 24 V industrial bus lines. |
| Breakdown Voltage (VBR) | 31.1–34.4 V at 1 mA - defines precise conduction onset; tight tolerance supports consistent protection threshold across production lots. |
| Clamping Voltage (VC) | 45.4 V at 4.4 A IPPM - limits voltage seen by protected IC during surge; stays below 50 V absolute max rating of most microcontrollers. |
| Junction Capacitance (CD) | 227 pF at 0 V, 1 MHz - low enough for USB 2.0 full-speed signaling without measurable eye diagram degradation. |
| ESD Rating | ±30 kV contact / ±30 kV air per IEC 61000-4-2 - exceeds Level 4 immunity requirements for handheld and panel-mounted equipment. |
| Package | DO-219AB (SOD-123W-compatible) - 3.9 × 1.9 × 1.08 mm footprint enables high-density routing on compact PCBs. |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including H3B-class ESD (≥8 kV HBM) and extended temperature cycling. |
Pinout & Package
SMF28A-HE3_A18 uses the DO-219AB (SMF) package: a low-profile, surface-mount, single-diode configuration with cathode marked by a bar on the body. The device has two terminals: anode and cathode - no internal connections or multi-pin functionality.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input side of protection path | Connected to signal line or power rail being protected; carries surge current into the diode during overvoltage events. |
| Cathode | Output side / ground reference | Connected to system ground or low-impedance return path; completes clamping loop and determines unidirectional polarity. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Handles common lightning-induced surges on industrial fieldbus lines without thermal runaway. |
| ±30 kV IEC 61000-4-2 ESD immunity | Eliminates need for secondary ESD protection stages in consumer and medical touch interfaces. |
| 227 pF capacitance at 0 V | Preserves signal integrity on 480 Mbps USB 2.0 differential pairs with <1% rise-time degradation. |
| AEC-Q101 qualified | Validated for under-hood automotive applications including CAN FD physical layer protection. |
| DO-219AB package with MSL level 1 | Enables standard reflow soldering without baking; compatible with automated SMT assembly lines. |
Applications
| USB 2.0 Interface Protection | HDMI Signal Line Protection |
|---|---|
Use Scenario: Protecting D+ and D− lines of embedded USB host controllers against ESD events during cable insertion or handling. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between data line and ground, activated only during positive transients relative to ground. Use Value: 227 pF capacitance avoids signal jitter; 45.4 V clamping prevents damage to USB PHY transceivers rated for ≤5.5 V supply but exposed to 24 V system rails. | Use Scenario: Safeguarding TMDS clock and data channels in portable displays against electrostatic discharge during hot-plug operations. IC Role / Device Role / Timing Role: Low-capacitance TVS diode connected from each TMDS line to chassis ground, suppressing fast-rising ESD pulses without attenuating 165 MHz pixel clocks. Use Value: Sub-1 ns response time ensures clamping occurs before HDMI receiver input structures are overstressed; DO-219AB footprint fits tight 0.5 mm pitch layouts. |
| Industrial PLC Digital I/O Protection | Automotive Body Control Module Inputs |
Use Scenario: Shielding 24 V digital input channels in programmable logic controllers from induced surges on long sensor wiring runs. IC Role / Device Role / Timing Role: Standoff-rated TVS diode installed between field-side input terminal and controller-side buffer IC, conducting only during overvoltage faults. Use Value: 28 V VRWM matches standard 24 V nominal industrial bus; 4.4 A IPPM handles typical 10/1000 μs transients from relay switching or motor commutation. | Use Scenario: Protecting LIN bus inputs and switch sense pins in door modules against ESD from user interaction and load dump coupling. IC Role / Device Role / Timing Role: AEC-Q101-qualified unidirectional suppressor placed at connector interface, referenced to vehicle chassis ground. Use Value: ±30 kV ESD rating meets ISO 10605 requirements; 175 °C max junction temperature supports under-dash mounting near HVAC ducts. |
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 (Vishay) | DO-214AC (SMA) package; 2.5 mm height vs. 1.08 mm; 38.9 V VC at 4.3 A; 350 pF capacitance. | Higher profile and capacitance limit use in USB/HDMI; better suited for power rail protection where board height and speed are less critical. | Select SMAJ28A-E3/5A only when higher surge handling (400 W) is prioritized over board space and signal integrity. |
| TPD2E001DRYR (TI) | 0.65 mm × 0.65 mm DRY (X2SON) dual-channel array; 22 V VRWM; 12 pF per channel; not AEC-Q101 qualified. | Designed for ultra-compact, high-speed data lanes (e.g., USB Type-C CC lines); lacks automotive qualification and 28 V standoff capability. | Choose TPD2E001DRYR for space-constrained consumer electronics with lower voltage rails; avoid for 24 V industrial or automotive use. |
Compared with SMAJ28A-E3/5A and TPD2E001DRYR, the SMF28A-HE3_A18 uniquely balances 28 V standoff, 227 pF capacitance, AEC-Q101 qualification, and 1.08 mm profile - making it the optimal choice for automotive infotainment interfaces and industrial USB peripherals where height, voltage rating, and reliability are jointly constrained.
Availability
SMF28A-HE3_A18 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, industrial PLC digital I/O protection, and automotive body control module inputs requiring stable component supply and long-term lifecycle assurance.
Supply support for SMF28A-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 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 low capacitance and AEC-Q101 qualification - engineered specifically for ESD-critical interfaces in automotive infotainment, industrial HMI, and medical data acquisition systems.
FAQ
What is the standoff voltage rating of the SMF28A-HE3_A18?
The SMF28A-HE3_A18 has a maximum standoff voltage (VRWM) of 28 V, meaning it remains non-conductive under normal operating conditions up to this reverse voltage. This rating aligns with 24 V industrial bus systems and ensures reliable blocking behavior during steady-state operation before clamping initiates at its 31.1–34.4 V breakdown range. The SMF28A-HE3_A18 maintains low leakage (<0.1 μA at VRWM) to avoid loading sensitive signal paths.
Is the SMF28A-HE3_A18 qualified for automotive applications?
Yes, the SMF28A-HE3_A18 is AEC-Q101 qualified, having passed stress tests including human body model ESD (class H3B, >8 kV), temperature cycling, and high-temperature operating life. Its 175 °C maximum junction temperature and ±30 kV IEC 61000-4-2 rating make it suitable for under-hood and cabin-mounted automotive electronics. The SMF28A-HE3_A18 is commonly deployed in body control modules and infotainment system I/O protection.
What is the clamping voltage of the SMF28A-HE3_A18 at its rated peak pulse current?
The SMF28A-HE3_A18 exhibits a maximum clamping voltage (VC) of 45.4 V when subjected to its rated 4.4 A peak pulse current (IPPM) under a 10/1000 μs waveform. This value ensures protected downstream ICs - such as USB transceivers or microcontroller GPIOs - remain within their absolute maximum voltage ratings during surge events. The SMF28A-HE3_A18 achieves this with low dynamic impedance and minimal overshoot due to its "Low Noise" silicon design.
Does the SMF28A-HE3_A18 have a bidirectional or unidirectional configuration?
The SMF28A-HE3_A18 is a unidirectional TVS diode, configured to clamp only positive transients relative to ground (anode grounded, cathode to line). Its marking code "CG" and electrical characteristics table confirm single-polarity operation. This configuration provides lower capacitance than bidirectional variants and is ideal for DC-biased signal lines like USB D+/D− or 24 V digital inputs. The SMF28A-HE3_A18 must be oriented correctly on PCBs with cathode toward the protected line.
What package type does the SMF28A-HE3_A18 use, and is it compatible with standard SMT processes?
The SMF28A-HE3_A18 uses the DO-219AB (SMF) package - a low-profile, surface-mount outline measuring 3.9 × 1.9 × 1.08 mm with a cathode bar marking. It is fully compatible with wave and reflow soldering per J-STD-020 MSL level 1, with peak reflow temperatures up to 260 °C. The SMF28A-HE3_A18 footprint matches SOD-123W land patterns, enabling drop-in placement in existing designs using that footprint.
SMF28A-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):
- 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-HE3_A18 FAQ
1.How can I place an order for SMF28A-HE3_A18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF28A-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 SMF28A-HE3_A18 reliable?
The price and inventory of SMF28A-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 SMF28A-HE3_A18 is usually 5 days.
3.What payment methods are accepted for SMF28A-HE3_A18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF28A-HE3_A18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF28A-HE3_A18?
SMF28A-HE3_A18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF28A-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 SMF28A-HE3_A18?
For technical support, including SMF28A-HE3_A18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF28A-HE3_A18 requirements.
6.How does Aetrix verify that SMF28A-HE3_A18 is sourced from the original manufacturer or authorized distributors?
All SMF28A-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 SMF28A-HE3_A18 meets industry standards.
7.What is the process for return or replacement of SMF28A-HE3_A18?
All SMF28A-HE3_A18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF28A-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 SMF28A-HE3_A18 part is unused and in its original packaging.
Return procedure for SMF28A-HE3_A18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF28A-HE3_A18 Tags
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