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Vishay SMF28A-HE3_A08
- Part No.:
- SMF28A-HE3_A08
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF28A-HE3_A08.pdf
- Description:
- ESD PROTECTION DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,223
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Product details
Overview
SMF28A-HE3_A08 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 stand-off voltage (VRWM), 31.1–34.4 V reverse breakdown (VBR), 4.4 A peak pulse current (IPPM), 45.4 V maximum clamping voltage (VC), and 227 pF typical capacitance at 1 MHz.
For engineers reviewing the SMF28A-HE3_A08 datasheet, SMF28A-HE3_A08 pinout, SMF28A-HE3_A08 application, or SMF28A-HE3_A08 equivalent, key selection criteria include IEC 61000-4-2 ±30 kV ESD immunity, AEC-Q101 qualification, low-profile SOD-123W-compatible packaging, and clamping performance under 10/1000 μs surge conditions.
Technical Context
This device operates as a single-channel unidirectional TVS diode with cathode-anode polarity, optimized for fast response to electrostatic discharge events. Its "Low Noise" technology ensures sub-nanosecond response time, and its junction temperature range of –65 °C to +175 °C supports automotive and industrial environments.
The SMF28A-HE3_A08 delivers 200 W peak pulse power (10/1000 μs), 1000 W (8/20 μs), and maintains <0.1 μA reverse leakage at VRWM - enabling reliable protection without signal distortion in USB, HDMI, and CAN bus interfaces where capacitance and clamping voltage are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 28 V - defines maximum continuous operating voltage before conduction begins; sets safe margin for 24 V nominal systems. |
| Reverse Breakdown (VBR) | 31.1–34.4 V at 1 mA - ensures predictable turn-on during transients while avoiding false triggering. |
| Clamping Voltage (VC) | 45.4 V at 4.4 A IPPM - limits downstream voltage stress during 10/1000 μs surges to protect sensitive ICs. |
| Capacitance (CD) | 227 pF at 0 V, 1 MHz - low enough for USB 2.0 and RS-485, but not suitable for >100 MHz high-speed serial links. |
| 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 footprint enables dense PCB layouts and automated reflow assembly. |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including HBM >8 kV and temperature cycling across –65 °C to +175 °C. |
Pinout & Package
SMF28A-HE3_A08 uses the DO-219AB (SOD-123W-compatible) surface-mount package: anodic terminal at one end, cathodic marking bar at the other. The package height is 1.08 mm max, length 3.9 mm, width 1.9 mm, with gull-wing leads optimized for wave and reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Input/Line side connection | Connected to protected signal line; conducts surge current toward ground when cathode is held at reference potential. |
| Cathode (bar-marked end) | Ground-reference terminal | Must be tied to low-impedance system ground; determines unidirectional clamping behavior and ESD current path. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Enables robust protection against repetitive lightning-induced surges in industrial control I/O modules. |
| ±30 kV IEC 61000-4-2 ESD immunity | Meets highest severity level for human-body and air-gap discharge in handheld and panel-mounted equipment. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients, improving clamping consistency across pulse amplitudes. |
| AEC-Q101 qualified | Validated for automotive infotainment and body electronics where long-term reliability under thermal cycling is mandatory. |
| "Low Noise" fast-response technology | Sub-ns switching reduces jitter and signal integrity degradation on high-speed digital buses like CAN FD and LIN. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital I/O Port |
|---|---|
Use Scenario: Protecting LIN bus lines from ESD events during vehicle assembly and service operations. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between LIN transceiver and connector, clamping transients before they reach the PHY layer. Use Value: Prevents latch-up or permanent damage to LIN transceivers under ±30 kV contact discharge, maintaining communication integrity without adding signal delay. | Use Scenario: Shielding 24 V digital input channels in programmable logic controllers exposed to factory floor ESD and inductive kickback. IC Role / Device Role / Timing Role: Standoff-rated transient suppressor on each opto-isolator input, absorbing energy from relay coil flyback and operator touch events. Use Value: Enables 28 V VRWM compatibility with 24 V nominal supply rails while limiting clamped voltage to 45.4 V - well below opto-isolator absolute maximum ratings. |
| USB 2.0 Host Port Protection | RS-485 Transceiver Interface |
Use Scenario: Safeguarding upstream USB 2.0 data lines (D+/D−) on embedded host controllers in medical devices. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional pair (two SMF28A-HE3_A08 devices) placed per line, referenced to common ground. Use Value: 227 pF capacitance preserves signal rise/fall times for 480 Mbps operation, while 45.4 V clamping prevents overvoltage damage to USB PHY circuitry. | Use Scenario: Protecting half-duplex RS-485 transceivers in building automation networks subject to cable coupling and lightning-induced surges. IC Role / Device Role / Timing Role: Line-to-ground TVS on both A and B differential lines, with cathodes tied to chassis ground via low-inductance path. Use Value: 200 W (10/1000 μs) rating handles multi-pulse surge events common in long cable runs, and DO-219AB package allows compact dual-line layout. |
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; larger 4.5 × 2.7 mm footprint; 45.4 V VC same, but 5.0 A IPPM vs. 4.4 A. | Less suitable for space-constrained layouts; higher thermal mass improves power handling but slows response slightly. | Choose SMAJ28A-E3/5A only if board area permits and higher IPPM margin is required beyond 4.4 A. |
| TPD2E001DRYR (TI) | 0.65 mm × 0.65 mm DRY (X2SON) package; dual-channel; 12 pF capacitance; lower 24 V VRWM; not AEC-Q101 qualified. | Designed for ultra-high-speed interfaces (USB 3.0, HDMI); lacks automotive qualification and high-power surge capability. | Use TPD2E001DRYR only for low-capacitance, consumer-grade high-speed data lines - not for 24 V industrial or automotive ESD protection. |
Compared with SMAJ28A-E3/5A and TPD2E001DRYR, the SMF28A-HE3_A08 uniquely balances AEC-Q101 qualification, 28 V standoff, 45.4 V clamping, and DO-219AB compactness - making it optimal for automotive BCMs and industrial I/O where reliability, size, and 24 V system compatibility intersect.
Availability
SMF28A-HE3_A08 is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, USB 2.0 host ports, and RS-485 communication interfaces requiring stable component supply and AEC-Q101-compliant ESD protection.
Supply support for SMF28A-HE3_A08 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 automotive-grade validation.
The SMF series targets high-reliability transient suppression in harsh environments, with design focus on AEC-Q101 compliance, low-profile packaging, and precise clamping for 12 V–48 V industrial and automotive signal lines.
FAQ
What is the maximum clamping voltage of the SMF28A-HE3_A08 under standard test conditions?
The SMF28A-HE3_A08 has a maximum clamping voltage (VC) of 45.4 V when subjected to its rated peak pulse current of 4.4 A using a 10/1000 μs waveform. This value is measured per IEC 61000-4-5 and ensures downstream ICs remain within safe operating voltage limits during surge events. The SMF28A-HE3_A08 achieves this clamping performance while maintaining low incremental surge resistance for consistent voltage limiting across varying transient amplitudes.
Is the SMF28A-HE3_A08 qualified to AEC-Q101 standards?
Yes, the SMF28A-HE3_A08 is AEC-Q101 qualified, having passed stress tests including high-temperature operating life, temperature cycling, and human body model ESD (H3B class >8 kV). This qualification confirms its suitability for automotive applications such as body control modules and infotainment interfaces where long-term reliability under thermal and electrical stress is mandatory. The SMF28A-HE3_A08 meets all AEC-Q101 requirements as documented in Vishay's official qualification report.
What is the reverse stand-off voltage (VRWM) specification for the SMF28A-HE3_A08?
The SMF28A-HE3_A08 has a maximum reverse stand-off voltage (VRWM) of 28 V, meaning it remains non-conductive up to this DC or RMS voltage level under normal operating conditions. This parameter provides a safe margin above 24 V nominal systems while ensuring no leakage current exceeds 0.1 μA. The SMF28A-HE3_A08's VRWM is tightly controlled to prevent false triggering in industrial and automotive power domains where voltage tolerances are narrow.
Does the SMF28A-HE3_A08 support reflow soldering, and what is its MSL rating?
Yes, the SMF28A-HE3_A08 is fully compatible with lead-free reflow soldering processes, with a peak temperature rating of 260 °C per J-STD-020. Its moisture sensitivity level (MSL) is rated at Level 1 - indicating unlimited floor life at ≤30 °C/60% RH and no baking requirement prior to assembly. The SMF28A-HE3_A08's DO-219AB package is specifically designed for robust thermal performance in automated SMT lines used in automotive and industrial manufacturing.
How does the capacitance of the SMF28A-HE3_A08 affect high-speed signal integrity?
The SMF28A-HE3_A08 exhibits 227 pF typical capacitance at 0 V and 1 MHz, which is appropriate for USB 2.0 (480 Mbps), RS-485, and LIN bus applications but unsuitable for >100 MHz interfaces like USB 3.0 or HDMI. This capacitance introduces minimal signal attenuation and rise-time degradation in 24 V industrial control signals. The SMF28A-HE3_A08's capacitance is stable across reverse bias voltages, ensuring consistent ESD protection behavior without compromising timing margins in medium-speed digital links.
SMF28A-HE3_A08 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_A08 FAQ
1.How can I place an order for SMF28A-HE3_A08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF28A-HE3_A08 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_A08 reliable?
The price and inventory of SMF28A-HE3_A08 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_A08 is usually 5 days.
3.What payment methods are accepted for SMF28A-HE3_A08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF28A-HE3_A08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF28A-HE3_A08?
SMF28A-HE3_A08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF28A-HE3_A08 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_A08?
For technical support, including SMF28A-HE3_A08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF28A-HE3_A08 requirements.
6.How does Aetrix verify that SMF28A-HE3_A08 is sourced from the original manufacturer or authorized distributors?
All SMF28A-HE3_A08 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_A08 meets industry standards.
7.What is the process for return or replacement of SMF28A-HE3_A08?
All SMF28A-HE3_A08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF28A-HE3_A08, 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_A08 part is unused and in its original packaging.
Return procedure for SMF28A-HE3_A08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF28A-HE3_A08 Tags
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