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Vishay SMF17A-HM3_A18
- Part No.:
- SMF17A-HM3_A18
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF17A-HM3_A18.pdf
- Description:
- ESD PROTECTION DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,125
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Product details
Overview
SMF17A-HM3_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 17 V standoff voltage (VRWM), 27.6 V maximum clamping voltage at 7.2 A peak pulse current, ±30 kV IEC 61000-4-2 ESD immunity, and 200 W peak pulse power (10/1000 μs). It is used to safeguard USB 2.0, HDMI, and industrial sensor interfaces against electrostatic discharge.
For engineers reviewing the SMF17A-HM3_A18 datasheet, SMF17A-HM3_A18 pinout, SMF17A-HM3_A18 application, or SMF17A-HM3_A18 equivalent, key selection criteria include clamping voltage under 28 V, low capacitance (324 pF at 0 V), AEC-Q101 qualification status, SOD-123W-compatible footprint, and compliance with IEC 61000-4-2 Level 4.
Technical Context
This device operates as a single-channel unidirectional TVS diode, leveraging silicon avalanche breakdown to clamp transients above its reverse standoff voltage. Its low incremental surge resistance ensures rapid voltage limiting during ESD events, while its "Low Noise" technology enables sub-nanosecond response time.
The SMF17A-HM3_A18 is rated for continuous operation from –65 °C to +175 °C and supports wave and reflow soldering per J-STD-020 MSL level 1. It delivers 200 W peak pulse power (10/1000 μs) and withstands ±30 kV contact/air discharge per IEC 61000-4-2 - meeting automotive-grade reliability requirements when AEC-Q101 qualified.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 17 V - maximum continuous reverse operating voltage before clamping begins |
| Clamping Voltage (VC) | 27.6 V at 7.2 A - limits transient voltage to safe levels for downstream ICs |
| Peak Pulse Power | 200 W (10/1000 μs) - sustains short-duration surges without failure |
| Capacitance | 324 pF at 0 V, 1 MHz - compatible with USB 2.0 and industrial serial interfaces |
| ESD Rating | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - exceeds Level 4 immunity requirement |
| Operating Temp Range | –65 °C to +175 °C - suitable for under-hood automotive and industrial environments |
| Package | DO-219AB (SOD-123W-compatible) - low-profile 3.9 mm × 1.9 mm surface-mount outline |
Pinout & Package
SMF17A-HM3_A18 uses the DO-219AB (SMF) package: 3.9 mm length × 1.9 mm width × 1.08 mm height, molded in UL 94 V-0 compound, MSL level 1, with cathode bar marking on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path | Connected to protected line; conducts during positive transients when used in unidirectional configuration |
| Cathode | Clamping reference node | Connected to ground or low-impedance return path; defines clamping threshold relative to VRWM |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Enables robust protection against repetitive ESD and lightning-induced surges in industrial control systems |
| ±30 kV IEC 61000-4-2 ESD immunity | Meets highest severity level for human-body and air-gap discharge in harsh handling environments |
| 324 pF capacitance at 0 V | Minimizes signal distortion on 480 Mbps USB 2.0 and RS-485 links without requiring impedance tuning |
| AEC-Q101 qualified option available | Validated for automotive applications including infotainment and body electronics where reliability is critical |
| DO-219AB low-profile package | Reduces board space vs. SMA/SMB; compatible with automated SMT placement and reflow profiles up to 260 °C |
Applications
| USB 2.0 Interface Protection | HDMI Signal Line Protection |
|---|---|
Use Scenario: Protecting D+ and D− differential pairs in portable USB peripherals against ESD during plug/unplug cycles. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between each data line and ground, clamping transients before they reach the USB transceiver. Use Value: Maintains signal integrity with 324 pF capacitance while limiting voltage to ≤27.6 V, preventing latch-up or damage to 3.3 V PHY circuitry. | Use Scenario: Safeguarding TMDS clock and data channels in consumer displays exposed to field ESD events. IC Role / Device Role / Timing Role: Single-channel transient suppressor installed on each TMDS lane, referenced to chassis ground. Use Value: Clamps 30 kV discharges within nanoseconds without degrading 165 MHz pixel clock timing or introducing jitter. |
| Automotive Sensor Interface | Industrial RS-485 Node |
Use Scenario: Protecting LIN bus or analog sensor outputs (e.g., temperature, pressure) in engine control modules. IC Role / Device Role / Timing Role: Standoff-rated TVS placed between sensor output and microcontroller ADC input. Use Value: Withstands –65 °C to +175 °C ambient and clamps transients to <28 V, ensuring reliable operation in under-hood environments. | Use Scenario: Shielding RS-485 transceivers in factory automation nodes connected to long cable runs. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional diode (used with complementary pair) on A/B lines to suppress induced surges. Use Value: Delivers 200 W pulse handling and low clamping to preserve differential voltage margins across 120 Ω termination. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ17A-E3/5A | Higher clamping voltage (33.2 V), larger SMA package (4.5 mm × 2.7 mm), same 17 V VRWM | Less suitable for space-constrained USB/HDMI layouts; better for higher-energy surges due to 400 W rating | Select SMAJ17A-E3/5A only if board area allows and peak pulse energy exceeds 200 W capability of SMF17A-HM3_A18 |
| TPD2E001DRYR | 2-channel, 15 pF ultra-low capacitance, 5 V VRWM, not AEC-Q101 qualified | Designed for high-speed digital interfaces like USB 3.0 or MIPI; unsuitable for 17 V rail protection | Choose TPD2E001DRYR for low-capacitance, multi-line protection below 6 V; not a functional replacement for SMF17A-HM3_A18 |
Compared with SMAJ17A-E3/5A and TPD2E001DRYR, the SMF17A-HM3_A18 uniquely balances compact DO-219AB packaging, 17 V standoff, 27.6 V clamping, and automotive-grade thermal range - making it optimal for space-limited 12–24 V industrial and automotive data line protection where moderate capacitance is acceptable.
Availability
SMF17A-HM3_A18 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, automotive sensor signal conditioning, and industrial RS-485 node design requiring stable component supply and long-term lifecycle support.
Supply support for SMF17A-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 Intertechnology is a global semiconductor manufacturer specializing in discrete components, passive elements, and sensors, with emphasis on reliability, precision, and high-power performance.
The SMF series belongs to Vishay's eSMP® family of surface-mount TVS diodes, engineered specifically for high-efficiency ESD and surge protection in automotive, industrial, and consumer electronics with stringent space and thermal constraints.
FAQ
What is the clamping voltage specification for SMF17A-HM3_A18?
The SMF17A-HM3_A18 has a maximum reverse clamping voltage (VC) of 27.6 V at 7.2 A peak pulse current (10/1000 μs waveform). This value is measured under standardized surge conditions and defines the upper voltage limit imposed on protected circuits during transient events. The clamping performance is guaranteed across its full operating temperature range of –65 °C to +175 °C, and the SMF17A-HM3_A18 maintains this specification without derating in typical PCB layouts with recommended copper pad areas.
Is SMF17A-HM3_A18 AEC-Q101 qualified?
The SMF17A-HM3_A18 is part of the AEC-Q101-qualified SMF family, but qualification applies only to specific ordering variants marked with "-HE3" or "-HM3" suffixes indicating automotive-grade screening. The "_A18" packaging code denotes 10k/reel in 13″ tape; qualification status is confirmed by Vishay's official documentation for the SMF17A-HE3_A18 and SMF17A-HM3_A18 variants. Always verify the full part number's qualification certificate via Vishay's QCI portal before automotive deployment.
What is the capacitance of SMF17A-HM3_A18 and how does it affect high-speed signals?
The SMF17A-HM3_A18 exhibits 324 pF typical junction capacitance at 0 V and 1 MHz. This value decreases significantly with increasing reverse bias - e.g., to ~120 pF at 12 V - enabling use on moderate-speed interfaces like USB 2.0 (480 Mbps) and RS-485 without measurable signal rise-time degradation. For higher-speed links such as USB 3.0 or HDMI 2.0, lower-capacitance alternatives are recommended, but the SMF17A-HM3_A18 remains appropriate where bandwidth requirements stay below ~100 MHz.
Can SMF17A-HM3_A18 be used in bidirectional configurations?
No - the SMF17A-HM3_A18 is a unidirectional TVS diode, optimized for clamping transients on positive-going signals referenced to ground. To protect AC-coupled or truly bidirectional lines (e.g., RS-485 A/B), two SMF17A-HM3_A18 devices must be used in opposing polarity or a dedicated bidirectional variant (e.g., SMF17CA) selected. Using a single unidirectional device on a bidirectional line risks forward conduction during negative excursions and potential damage.
What is the package type and soldering compatibility of SMF17A-HM3_A18?
The SMF17A-HM3_A18 uses the DO-219AB package (also known as SMF), measuring 3.9 mm × 1.9 mm × 1.08 mm, with SOD-123W footprint compatibility. It is fully wave and reflow solderable per J-STD-020, supporting peak temperatures up to 260 °C. The device is MSL level 1, requiring no dry-pack or baking prior to assembly, and its cathode bar marking aligns with standard orientation in 8 mm carrier tape per Vishay's reel specification for the _A18 suffix.
SMF17A-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):
- 17V
- Voltage - Breakdown (Min):
- 18.9V
- Voltage - Clamping (Max) @ Ipp:
- 27.6V
- Current - Peak Pulse (10/1000µs):
- 7.2A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 324pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF17A-HM3_A18 FAQ
1.How can I place an order for SMF17A-HM3_A18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF17A-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 SMF17A-HM3_A18 reliable?
The price and inventory of SMF17A-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 SMF17A-HM3_A18 is usually 5 days.
3.What payment methods are accepted for SMF17A-HM3_A18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF17A-HM3_A18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF17A-HM3_A18?
SMF17A-HM3_A18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF17A-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 SMF17A-HM3_A18?
For technical support, including SMF17A-HM3_A18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF17A-HM3_A18 requirements.
6.How does Aetrix verify that SMF17A-HM3_A18 is sourced from the original manufacturer or authorized distributors?
All SMF17A-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 SMF17A-HM3_A18 meets industry standards.
7.What is the process for return or replacement of SMF17A-HM3_A18?
All SMF17A-HM3_A18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF17A-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 SMF17A-HM3_A18 part is unused and in its original packaging.
Return procedure for SMF17A-HM3_A18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF17A-HM3_A18 Tags
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