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Vishay SMF15A-HE3_A18
- Part No.:
- SMF15A-HE3_A18
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF15A-HE3_A18.pdf
- Description:
- ESD PROTECTION DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,775
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Product details
Overview
SMF15A-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 15 V standoff voltage (VRWM), 24.4 V maximum clamping voltage at 8.2 A peak pulse current, 367 pF typical capacitance at 0 V, ±30 kV IEC 61000-4-2 ESD immunity, and AEC-Q101 qualification for automotive use.
For engineers reviewing the SMF15A-HE3_A18 datasheet, SMF15A-HE3_A18 pinout, SMF15A-HE3_A18 application, or SMF15A-HE3_A18 equivalent, this device is selected for robust electrostatic discharge protection in USB 2.0, HDMI, automotive infotainment interfaces, and industrial sensor signal conditioning where low clamping voltage and controlled capacitance are critical.
Technical Context
This unidirectional TVS diode operates as a shunt-type transient suppressor, activating when reverse voltage exceeds its 16.7–18.5 V breakdown range. Its low incremental surge resistance enables fast clamping response (<1 ns), while the SOD-123W-compatible DO-219AB package supports automated reflow assembly with MSL level 1 handling.
The device meets IEC 61000-4-2 (±30 kV contact/air), IEC 61000-4-5 (1000 W at 8/20 μs), and AEC-Q101 Class H3B (>8 kV HBM) standards. Its 367 pF capacitance at 1 MHz and 0 V bias makes it suitable for signal integrity-sensitive applications up to ~100 Mbps without excessive loading.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 15 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 12 V nominal systems. |
| Clamping Voltage (VC) | 24.4 V at 8.2 A - Peak voltage seen by protected circuit during 10/1000 μs surge; ensures downstream ICs rated ≥24 V survive transients. |
| Peak Pulse Power | 200 W (10/1000 μs) - Sustains short-duration surges common in board-level ESD events without thermal failure. |
| Capacitance (CD) | 367 pF at 0 V, 1 MHz - Low enough to avoid signal degradation on medium-speed digital lines (e.g., CAN FD, RS-485). |
| ESD Rating | ±30 kV contact / ±30 kV air per IEC 61000-4-2 - Exceeds Level 4 immunity requirements for consumer and automotive end-equipment. |
| AEC-Q101 Qualified | Yes - Validated for automotive underhood and cabin applications requiring extended temperature operation (−65 °C to +175 °C). |
| Package | DO-219AB (SOD-123W compatible) - 3.9 × 1.9 × 1.08 mm low-profile outline enabling dense PCB layouts and automated placement. |
Pinout & Package
SMF15A-HE3_A18 uses the DO-219AB (SOD-123W-compatible) surface-mount package with cathode marking bar. The device has two terminals: anode and cathode. Mounting follows standard reflow profiles (peak ≤260 °C), with footprint recommendation of 2.9 mm × 1.4 mm pad length/width and 1.3 mm solder mask opening.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/line side connection | Connected to signal line or power rail requiring protection; current flows into anode during forward conduction (not used in normal operation). |
| Cathode | Ground reference connection | Connected to system ground or low-impedance return path; provides low-impedance shunt path for transient energy during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| Low clamping voltage | 24.4 V max at 8.2 A ensures protected ICs experience minimal overvoltage stress during ESD events. |
| Fast response time | <1 ns turn-on enables suppression before sensitive logic thresholds are exceeded. |
| Automotive-grade reliability | AEC-Q101 qualification confirms performance across −65 °C to +175 °C and lifetime vibration/shock requirements. |
| Reflow-solderable packaging | DO-219AB package supports standard lead-free reflow processes without popcorn cracking or delamination. |
| Controlled capacitance | 367 pF at 0 V avoids signal rise-time degradation on interfaces up to 100 Mbps. |
Applications
| USB 2.0 Data Lines | HDMI Signal Paths |
|---|---|
Use Scenario: Protecting D+ and D− differential pairs in portable and automotive USB hosts/peripherals against ESD events during hot-plug insertion. IC Role / Device Role / Timing Role: Unidirectional shunt TVS diode placed directly at connector, clamping transients before they reach USB transceiver IC. Use Value: 367 pF capacitance minimizes signal distortion on 480 Mbps links; 24.4 V clamping prevents damage to 3.3 V tolerant PHY inputs. | Use Scenario: Safeguarding TMDS clock and data channels in automotive head units and display modules exposed to cable-borne ESD. IC Role / Device Role / Timing Role: Point-of-entry transient suppressor on each TMDS pair, referenced to chassis ground via low-inductance layout. Use Value: ±30 kV IEC 61000-4-2 rating meets ISO 10605 automotive ESD test requirements; DO-219AB footprint allows tight coupling to connectors. |
| Automotive CAN Bus Nodes | Industrial Sensor Signal Conditioning |
Use Scenario: Protecting CAN_H and CAN_L lines in body control modules and ADAS ECUs against load dump and ESD-induced bus faults. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional pair (one per line) providing asymmetric clamping aligned with CAN common-mode voltage swing. Use Value: 15 V VRWM accommodates CAN's 2.5 V common-mode offset; 200 W pulse power handles ISO 7637-2 pulse 1/2a surges. | Use Scenario: Shielding analog outputs (e.g., 4–20 mA, 0–10 V) of pressure/temperature sensors in factory automation equipment from field wiring ESD. IC Role / Device Role / Timing Role: Low-leakage (0.1 μA max at 15 V) shunt protector placed between output pin and system ground. Use Value: 0.1 μA reverse leakage preserves accuracy of microamp-level sensor signals; 175 °C junction rating supports high-ambient industrial enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ15A-E3/57T | Higher clamping voltage (24.4 V → 25.5 V), larger SMA package (4.5 × 2.7 × 2.2 mm), same 15 V VRWM and AEC-Q101 qualification. | Less suitable for space-constrained USB/HDMI layouts due to 2.5× larger footprint and 2× height. | Select SMAJ15A-E3/57T only if higher surge margin (400 W vs. 200 W) justifies PCB area penalty. |
| TPD2E001DRYR | Lower capacitance (12 pF), dual-channel, but lower ESD rating (±8 kV contact), no AEC-Q101, and 5.5 V VRWM - not voltage-compatible. | Designed for high-speed digital interfaces (USB 3.0, DisplayPort); unsuitable for 12 V automotive supply rail protection. | TPD2E001DRYR is not a direct alternative for SMF15A-HE3_A18 due to incompatible standoff voltage and automotive qualification. |
Compared with SMAJ15A-E3/57T and TPD2E001DRYR, SMF15A-HE3_A18 delivers optimal balance of low profile, automotive qualification, and precise 15 V standoff for 12 V system protection-whereas alternatives trade off size, voltage rating, or qualification status.
Availability
SMF15A-HE3_A18 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor interfaces, and USB 2.0 peripheral designs requiring stable component supply and long-term production continuity.
Supply support for SMF15A-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, sensors, and passive elements, with leadership in power management, signal conditioning, and protection technologies.
The SMF series targets high-reliability ESD protection in automotive, industrial, and computing applications, emphasizing AEC-Q101 qualification, low clamping, and compact packaging for modern high-density PCBs.
FAQ
What is the standoff voltage of SMF15A-HE3_A18 and how does it relate to system design?
The SMF15A-HE3_A18 has a maximum standoff voltage (VRWM) of 15 V, meaning it remains non-conductive below this reverse voltage. This value is selected to provide margin above 12 V nominal automotive and industrial supply rails while ensuring reliable clamping onset during transients. Designers use this parameter to verify compatibility with downstream IC absolute maximum ratings and avoid false triggering during normal operation.
Does SMF15A-HE3_A18 meet automotive qualification standards?
Yes, SMF15A-HE3_A18 is AEC-Q101 qualified, confirming its suitability for automotive applications including engine control, infotainment, and ADAS subsystems. It passes stress tests for temperature cycling, humidity, mechanical shock, and ESD (HBM >8 kV), and operates across −65 °C to +175 °C junction temperature range-fully supporting under-hood and cabin deployment requirements.
What is the clamping voltage of SMF15A-HE3_A18 at its rated peak pulse current?
The SMF15A-HE3_A18 exhibits a maximum clamping voltage (VC) of 24.4 V at its rated peak pulse current (IPPM) of 8.2 A under a 10/1000 μs waveform. This value represents the highest voltage imposed on the protected circuit during worst-case surge conditions and is critical for ensuring downstream ICs with 24 V or higher absolute maximum ratings remain undamaged.
How does the capacitance of SMF15A-HE3_A18 affect high-speed signal integrity?
With a typical capacitance of 367 pF at 0 V and 1 MHz, SMF15A-HE3_A18 introduces measurable loading on high-speed lines. It is optimized for interfaces up to ~100 Mbps (e.g., CAN FD, RS-485, USB 2.0 full-speed); for faster protocols like USB 3.0 or PCIe, lower-capacitance alternatives are required. Layout best practices-including short traces and ground plane proximity-help mitigate signal rise-time degradation caused by this capacitance.
What package type does SMF15A-HE3_A18 use and what are its key mechanical dimensions?
SMF15A-HE3_A18 uses the DO-219AB package (also known as SOD-123W-compatible), measuring 3.9 mm in length, 1.9 mm in width, and 1.08 mm in height. Its low-profile form factor and cathode-bar marking support automated optical inspection and high-density PCB routing. The package is rated MSL level 1 and qualified for peak reflow temperatures up to 260 °C.
SMF15A-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):
- 15V
- Voltage - Breakdown (Min):
- 16.7V
- Voltage - Clamping (Max) @ Ipp:
- 24.4V
- Current - Peak Pulse (10/1000µs):
- 8.2A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 367pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF15A-HE3_A18 FAQ
1.How can I place an order for SMF15A-HE3_A18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF15A-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 SMF15A-HE3_A18 reliable?
The price and inventory of SMF15A-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 SMF15A-HE3_A18 is usually 5 days.
3.What payment methods are accepted for SMF15A-HE3_A18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF15A-HE3_A18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF15A-HE3_A18?
SMF15A-HE3_A18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF15A-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 SMF15A-HE3_A18?
For technical support, including SMF15A-HE3_A18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF15A-HE3_A18 requirements.
6.How does Aetrix verify that SMF15A-HE3_A18 is sourced from the original manufacturer or authorized distributors?
All SMF15A-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 SMF15A-HE3_A18 meets industry standards.
7.What is the process for return or replacement of SMF15A-HE3_A18?
All SMF15A-HE3_A18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF15A-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 SMF15A-HE3_A18 part is unused and in its original packaging.
Return procedure for SMF15A-HE3_A18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF15A-HE3_A18 Tags
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