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Vishay General Semiconductor - Diodes Division SMF14A-HM3-18
- Part No.:
- SMF14A-HM3-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF14A-HM3-18.pdf
- Description:
- TVS DIODE 14VWM 23.2VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:6,785
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Product details
Overview
SMF14A-HM3-18 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 14 V stand-off voltage (VRWM), 15.6–17.3 V reverse breakdown (VBR), 23.2 V maximum clamping voltage at 8.6 A peak pulse current (IPPM), and 392 pF typical junction capacitance at 0 V - optimized for USB 2.0, HDMI, and industrial I/O protection.
For engineers reviewing the SMF14A-HM3-18 datasheet, SMF14A-HM3-18 pinout, SMF14A-HM3-18 application, or SMF14A-HM3-18 equivalent, this device delivers verified ±30 kV IEC 61000-4-2 ESD immunity, AEC-Q101 qualification, low-profile SOD-123W-compatible packaging, and precise clamping performance for automotive infotainment and industrial sensor interface designs.
Technical Context
This unidirectional TVS diode operates as a shunt-type transient suppressor, conducting only when reverse voltage exceeds its breakdown threshold to clamp surge energy away from sensitive downstream circuitry. Its low incremental surge resistance and fast response time enable effective suppression of ESD events per IEC 61000-4-2 and lightning-induced surges per IEC 61000-4-5 (8/20 μs waveform).
The SMF14A-HM3-18 is rated for 200 W peak pulse power (10/1000 μs), 1000 W (8/20 μs), and supports continuous operation from –65 °C to +175 °C with 180 K/W junction-to-ambient thermal resistance on standard epoxy-glass PCBs - making it suitable for under-hood automotive and harsh-environment industrial deployments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 14 V - defines maximum continuous operating voltage before conduction begins; ensures no interference with 12 V nominal bus systems. |
| Reverse Breakdown (VBR) | 15.6–17.3 V at 1 mA - tight tolerance enables predictable turn-on during transients without premature leakage. |
| Clamping Voltage (VC) | 23.2 V at 8.6 A (10/1000 μs) - limits downstream voltage stress during surge events to protect 24 V-rated ICs. |
| Junction Capacitance (CD) | 392 pF at 0 V, 1 MHz - low enough for USB 2.0 (480 Mbps) signal integrity while maintaining robust ESD margin. |
| ESD Immunity | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - exceeds Level 4 requirements for consumer and automotive electronics. |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including HBM >8 kV, enabling use in ADAS camera modules and infotainment ports. |
| Package | DO-219AB (SOD-123W-compatible) - 3.9 × 1.9 × 1.08 mm low-profile outline supports high-density PCB layouts and automated reflow assembly. |
Pinout & Package
SMF14A-HM3-18 uses the DO-219AB (SOD-123W-compatible) surface-mount package: cathode-marked anode-cathode configuration in a 2-terminal, single-channel unidirectional TVS structure. Dimensions: 3.9 mm length × 1.9 mm width × 1.08 mm height; molded UL 94 V-0 compound; MSL level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (cathode-bar side opposite) | Input/Line-side connection | Connected to protected signal line (e.g., USB D+); conducts surge current toward ground when clamped. |
| Cathode (marked with bar) | Ground-reference terminal | Must be tied to low-impedance system ground plane to ensure effective clamping and minimal voltage overshoot. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Enables reliable suppression of repetitive ESD and surge events without thermal runaway in compact layouts. |
| Low clamping ratio (VC/VBR ≈ 1.4) | Minimizes overvoltage stress on protected ICs - critical for 3.3 V/5 V logic interfacing with 12–24 V buses. |
| "Low Noise" fast-response technology | Sub-nanosecond response ensures clamping activation before ESD pulse peaks, preserving signal fidelity. |
| AEC-Q101 qualified & RoHS-compliant | Meets automotive supply chain requirements for temperature cycling, humidity, and long-term reliability validation. |
| SOD-123W footprint compatibility | Allows drop-in replacement in existing designs using industry-standard land patterns and stencil apertures. |
Applications
| USB 2.0 Interface Protection | HDMI Signal Line Protection |
|---|---|
Use Scenario: Protecting USB 2.0 D+/D− lines in automotive infotainment head units against hot-plug ESD and cable discharge events. IC Role / Device Role / Timing Role: Shunt-type transient voltage suppressor placed directly at connector entry point to divert ESD energy before reaching USB transceiver. Use Value: 392 pF capacitance avoids signal degradation at 480 Mbps; ±30 kV ESD rating exceeds ISO 10605 requirements for vehicle interiors. |
Use Scenario: Safeguarding HDMI TMDS channels in industrial display controllers exposed to field service ESD and electrostatic build-up. IC Role / Device Role / Timing Role: Unidirectional clamping diode installed per differential pair to maintain common-mode noise rejection while suppressing asymmetric transients. Use Value: 23.2 V clamping voltage prevents damage to 3.3 V HDMI receiver inputs during 15 kV contact discharge events. |
| Automotive Sensor I/O Protection | Industrial CAN Bus Node Protection |
Use Scenario: Shielding analog and digital I/O pins of pressure/temperature sensors in engine control modules from load dump and alternator ripple. IC Role / Device Role / Timing Role: Standoff-clamp TVS positioned between sensor output and microcontroller ADC input to limit overvoltage without DC loading. Use Value: 14 V VRWM aligns with 12 V vehicle electrical systems; 175 °C max junction temperature supports under-hood deployment. |
Use Scenario: Adding secondary ESD protection to CAN_H/CAN_L lines in gateways where primary protection resides at connector. IC Role / Device Role / Timing Role: Low-capacitance unidirectional TVS used in parallel with bidirectional arrays to enhance contact-discharge immunity without increasing signal path capacitance. Use Value: 392 pF total capacitance preserves CAN FD bit timing margins up to 5 Mbps; AEC-Q101 qualification ensures functional safety compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ14A-E3/57T | Higher clamping voltage (25.1 V), larger SMA package (4.5 × 2.7 × 2.2 mm), 400 pF capacitance | Less suitable for high-speed interfaces due to size and capacitance; better for power rail protection | Choose SMAJ14A-E3/57T only if board space allows larger footprint and signal speed ≤ 100 Mbps |
| TPD2E001DRYR | 2-channel, 15 pF per line, 12 V VRWM, not AEC-Q101 qualified, 0.65 mm × 0.65 mm DRY package | Optimized for ultra-high-speed USB 3.0/MIPI but lacks automotive qualification and higher-energy surge handling | Use TPD2E001DRYR only in non-automotive portable devices requiring sub-20 pF capacitance and dual-line integration |
Compared with SMAJ14A-E3/57T and TPD2E001DRYR, SMF14A-HM3-18 uniquely balances AEC-Q101 qualification, 392 pF capacitance for USB 2.0, 23.2 V clamping, and DO-219AB compactness - making it the preferred choice for automotive and industrial I/O where reliability, size, and signal integrity are jointly constrained.
Availability
SMF14A-HM3-18 is available at Aetrix Electronics and suitable for automotive infotainment interfaces, industrial HDMI displays, and engine-control sensor I/O requiring stable component supply across extended temperature ranges and rigorous ESD compliance.
Supply support for SMF14A-HM3-18 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 data line protection with AEC-Q101 qualification, low capacitance, and precise clamping - engineered specifically for automotive infotainment, ADAS camera links, and industrial communication interfaces.
FAQ
What is the clamping voltage of SMF14A-HM3-18 at its rated peak pulse current?
The SMF14A-HM3-18 has a maximum clamping voltage (VC) of 23.2 V at 8.6 A peak pulse current (10/1000 μs waveform). This value is measured under standardized surge conditions and ensures downstream ICs rated for ≤24 V operation remain within safe voltage limits during transient events. The SMF14A-HM3-18 achieves this with low incremental surge resistance and fast response characteristics.
Is SMF14A-HM3-18 qualified for automotive applications?
Yes, SMF14A-HM3-18 is AEC-Q101 qualified and rated for operation from –65 °C to +175 °C. It meets human body model (HBM) Class H3B (>8 kV) and IEC 61000-4-2 ±30 kV contact/air discharge requirements - making it suitable for automotive infotainment, body control modules, and sensor interfaces where environmental robustness is mandatory. The SMF14A-HM3-18 is explicitly listed in Vishay's AEC-Q101 qualified product matrix.
What package does SMF14A-HM3-18 use, and is it compatible with standard SMT processes?
SMF14A-HM3-18 uses the DO-219AB package (also referenced as SOD-123W-compatible), measuring 3.9 × 1.9 × 1.08 mm with cathode-bar marking. It is fully wave- and reflow-solderable, qualified for peak temperatures up to 260 °C per J-STD-020, and classified as MSL level 1 - enabling seamless integration into high-volume automated assembly lines without special handling. The SMF14A-HM3-18 footprint matches industry-standard SOD-123W land patterns.
How does the junction capacitance of SMF14A-HM3-18 affect high-speed signal integrity?
With 392 pF typical junction capacitance at 0 V and 1 MHz, the SMF14A-HM3-18 maintains acceptable signal integrity for USB 2.0 (480 Mbps) and HDMI 1.4 (up to 3.4 Gbps per lane) when placed with minimized trace length and proper grounding. Its capacitance is significantly lower than legacy TVS devices (>1 nF), reducing rise-time degradation and reflection - a key design advantage confirmed in Vishay's application notes for high-speed interface protection. The SMF14A-HM3-18 datasheet provides layout guidelines to preserve bandwidth.
Can SMF14A-HM3-18 be used for bidirectional signal lines like RS-485 or CAN?
No - SMF14A-HM3-18 is a unidirectional TVS diode intended for single-polarity protection (e.g., 12 V supply rails or grounded-signal lines). For bidirectional interfaces such as RS-485 or CAN, a bidirectional variant like SMF14CA-HM3-18 (not SMF14A-HM3-18) is required. Using SMF14A-HM3-18 on a floating differential pair risks forward conduction during normal signal swings, potentially disrupting communication. Always verify polarity alignment before placing SMF14A-HM3-18 in circuit.
SMF14A-HM3-18 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-219AB
- Series:
- eSMP®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 14V
- Voltage - Breakdown (Min):
- 15.6V
- Voltage - Clamping (Max) @ Ipp:
- 23.2V
- Current - Peak Pulse (10/1000µs):
- 8.6A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 392pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF14A-HM3-18 FAQ
1.How can I place an order for SMF14A-HM3-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF14A-HM3-18 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 SMF14A-HM3-18 reliable?
The price and inventory of SMF14A-HM3-18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF14A-HM3-18 is usually 5 days.
3.What payment methods are accepted for SMF14A-HM3-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF14A-HM3-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF14A-HM3-18?
SMF14A-HM3-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF14A-HM3-18 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 SMF14A-HM3-18?
For technical support, including SMF14A-HM3-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF14A-HM3-18 requirements.
6.How does Aetrix verify that SMF14A-HM3-18 is sourced from the original manufacturer or authorized distributors?
All SMF14A-HM3-18 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 SMF14A-HM3-18 meets industry standards.
7.What is the process for return or replacement of SMF14A-HM3-18?
All SMF14A-HM3-18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF14A-HM3-18, 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 SMF14A-HM3-18 part is unused and in its original packaging.
Return procedure for SMF14A-HM3-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF14A-HM3-18 Tags
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