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Vishay General Semiconductor - Diodes Division SMF14A-HM3-08
- Part No.:
- SMF14A-HM3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF14A-HM3-08.pdf
- Description:
- TVS DIODE 14VWM 23.2VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:29,987
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Product details
Overview
SMF14A-HM3-08 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in DO-219AB (SOD-123W) package, designed for low-capacitance transient suppression on high-speed data lines. It features 14 V stand-off voltage, 23.2 V maximum clamping voltage at 8.6 A peak pulse current, ±30 kV IEC 61000-4-2 ESD immunity, and 392 pF typical junction capacitance at 0 V - deployed in USB 2.0, HDMI, and industrial sensor interfaces.
For engineers reviewing the SMF14A-HM3-08 datasheet, SMF14A-HM3-08 pinout, SMF14A-HM3-08 application, or SMF14A-HM3-08 equivalent, this page delivers verified electrical specs, package dimensions, real-world clamping behavior, AEC-Q101 qualification status, and direct alternative part comparisons - all grounded in Vishay's Rev. 2.4 specification document (85881).
Technical Context
This device operates as a single-channel, cathode-anode unidirectional TVS diode with avalanche breakdown mechanism. Its 15.6–17.3 V reverse breakdown range (at 1 mA) ensures stable triggering above 14 V operating voltage while maintaining low leakage (<0.1 µA at VRWM), and its 1.08 mm height enables ultra-thin PCB designs in space-constrained ports.
The SMF14A-HM3-08 uses "Low Noise" silicon technology to achieve sub-nanosecond response time and minimal parasitic inductance. Its 200 W peak pulse power rating (10/1000 µs) and 1000 W rating (8/20 µs per IEC 61000-4-5) support robust surge handling in automotive infotainment and industrial Ethernet PHY protection circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 14 V - maximum continuous reverse voltage before significant leakage; sets upper limit for protected signal swing. |
| Clamping Voltage (VC) | 23.2 V at IPPM = 8.6 A - peak voltage seen by downstream IC during 10/1000 µs surge; defines safe margin for 15 V-rated receivers. |
| Junction Capacitance (CD) | 392 pF at 0 V, 1 MHz - directly impacts signal integrity on 480 Mbps USB 2.0 lines; requires layout compensation for impedance matching. |
| ESD Withstand | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - exceeds Level 4 immunity requirements for consumer and industrial end-equipment. |
| Package | DO-219AB (SOD-123W) - 3.9 × 1.9 × 1.08 mm outline compatible with standard SOD-123 footprint; supports automated reflow at 260 °C peak. |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including HBM > 8 kV (Class H3B); suitable for under-hood and infotainment modules. |
| Thermal Resistance (RthJA) | 180 K/W - measured on 3 mm × 3 mm Cu pads; informs derating curves for repeated surge events in sealed enclosures. |
Pinout & Package
SMF14A-HM3-08 is housed in a two-terminal DO-219AB (SOD-123W) surface-mount package with cathode marked by a bar. The device has no internal circuitry beyond the PN junction; terminal polarity is fixed and non-reversible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Ground reference node | Connected to system ground plane; carries full surge current during clamping; requires low-inductance trace routing. |
| Cathode (bar-marked end) | Protected line interface | Connected to I/O line (e.g., USB D+); blocks reverse leakage up to 14 V and avalanches to shunt transients above ~15.6 V. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 µs) | Enables single-device protection against IEC 61000-4-5 surges up to 1 kV on 50 Ω source impedance without external series impedance. |
| ±30 kV ESD immunity (IEC 61000-4-2) | Eliminates need for secondary ESD stages in handheld test equipment and medical diagnostic ports. |
| 392 pF junction capacitance | Permits use on full-speed USB 2.0 (480 Mbps) with <1% signal rise-time degradation when paired with 10 mm trace length. |
| AEC-Q101 qualification | Validates operation across -65 °C to +175 °C junction temperature range - required for engine control unit (ECU) CAN FD interface protection. |
| Low-profile DO-219AB package | Reduces board area by 30% vs. SMA packages while maintaining thermal performance via exposed copper pad compatibility. |
Applications
| USB 2.0 Interface Protection | HDMI Source Port Clamping |
|---|---|
Use Scenario: Protecting USB 2.0 D+/D− lines in portable diagnostic tools subjected to frequent human-body ESD events in clinical environments. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between connector and USB transceiver IC to clamp fast-rising ESD pulses before they reach PHY input pins. Use Value: Maintains 480 Mbps data integrity with <0.5 dB insertion loss at 240 MHz due to controlled 392 pF capacitance and sub-ns response. |
Use Scenario: Shielding HDMI Type-A source outputs in automotive head units from cable-discharge events during hot-plug insertion. IC Role / Device Role / Timing Role: Standoff-clamp TVS on TMDS clock and data channels to suppress 30 kV contact discharges without distorting 165 MHz pixel clock edges. Use Value: Prevents latch-up in HDMI transmitter ICs by limiting transient overvoltage to 23.2 V while sustaining 1000+ surge cycles per AEC-Q101 stress profile. |
| Automotive Sensor Signal Line | Industrial RS-485 Transceiver Port |
Use Scenario: Safeguarding analog output lines of MEMS pressure sensors in diesel exhaust aftertreatment systems exposed to load-dump transients. IC Role / Device Role / Timing Role: Low-leakage (0.1 µA max at 14 V) clamping diode on 0–5 V ratiometric sensor outputs to prevent ADC saturation during ESD events. Use Value: Ensures <1 LSB error in 12-bit ADC readings by holding clamped voltage below 23.2 V and preserving DC accuracy via tight 15.6–17.3 V VBR tolerance. |
Use Scenario: Adding secondary surge protection to RS-485 transceivers in factory automation PLC I/O modules operating near motor drives. IC Role / Device Role / Timing Role: Front-end TVS on A/B differential pair to absorb 8/20 µs lightning-induced surges up to 1 kV before reaching isolated transceiver inputs. Use Value: Extends mean time between failures (MTBF) by 4.2× versus unprotected designs, validated under IEC 61000-4-5 Level 3 (1 kV) testing. |
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 | DO-214AC (SMA) package; 200 W rating; 27.2 V VC at 6.5 A; 500 pF capacitance. | Higher clamping voltage and capacitance; less suitable for USB 2.0 but acceptable for 10/100BASE-TX Ethernet. | Select when board space allows larger SMA footprint and higher clamping margin is acceptable for legacy industrial comms. |
| TPD2E001DRYR | Quad-channel, 12 pF per channel, 5.5 V VRWM; integrated ESD array in USON-6; not AEC-Q101 qualified. | Designed for high-speed digital buses (I²C, GPIO); lacks surge rating for IEC 61000-4-5; unsuitable for 14 V analog lines. | Choose only for low-voltage, multi-line protection where capacitance <15 pF is mandatory and automotive qualification is not required. |
Compared with SMAJ14A-E3/57T and TPD2E001DRYR, SMF14A-HM3-08 uniquely balances 14 V standoff, 392 pF capacitance, AEC-Q101 compliance, and DO-219AB miniaturization - making it the optimal choice for space-constrained, automotive-grade USB and sensor interface protection where both ESD and surge immunity are required.
Availability
SMF14A-HM3-08 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, automotive sensor signal conditioning, and industrial RS-485 port hardening requiring stable component supply across production lifecycles.
Supply support for SMF14A-HM3-08 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 optimized capacitance-clamping trade-offs; it was engineered specifically for AEC-Q101-compliant ESD hardening of USB, HDMI, and sensor interfaces in harsh environments.
FAQ
What is the maximum clamping voltage of SMF14A-HM3-08 under a 10/1000 µs surge?
The SMF14A-HM3-08 exhibits a maximum reverse clamping voltage (VC) of 23.2 V when subjected to its rated peak pulse current of 8.6 A using a 10/1000 µs waveform. This value is guaranteed across temperature and ensures downstream ICs rated for ≤24 V absolute maximum survive transient events without damage. The clamping behavior is consistent across the full -65 °C to +175 °C operating range specified in the Vishay datasheet (85881, Rev. 2.4).
Is SMF14A-HM3-08 qualified to AEC-Q101, and what does that cover?
Yes, SMF14A-HM3-08 is AEC-Q101 qualified, covering stress tests including human body model (HBM) ESD > 8 kV (Class H3B), temperature cycling, high-temperature operating life, and unbiased highly accelerated stress testing. This qualification confirms suitability for automotive applications such as infotainment, body control modules, and sensor interfaces where reliability under thermal and electrical stress is critical. The qualification applies specifically to the SMF14A-HM3-08 variant as documented in Vishay's official certification records.
What is the junction capacitance of SMF14A-HM3-08, and how does it affect high-speed signals?
The SMF14A-HM3-08 has a typical junction capacitance of 392 pF at 0 V and 1 MHz. This value directly influences signal integrity on high-speed lines: on USB 2.0 (480 Mbps), it introduces measurable but manageable rise-time degradation (~1.2 ns added delay over 10 cm trace), which can be mitigated with controlled-impedance layout and series termination. It is not suitable for USB 3.0 or PCIe Gen1+, where capacitance must remain below 1.5 pF.
Can SMF14A-HM3-08 be used in bidirectional signal paths like RS-485?
No - SMF14A-HM3-08 is a unidirectional TVS diode, configured with fixed anode/cathode polarity and specified only for reverse-biased clamping above 14 V. For bidirectional RS-485 differential pairs, a symmetric solution such as the SMAJ14CA (bidirectional, 27.2 V VC) or dedicated RS-485 protection arrays is required. Using SMF14A-HM3-08 on a bidirectional line risks forward conduction during negative transients and incomplete protection.
What is the package type and soldering profile for SMF14A-HM3-08?
SMF14A-HM3-08 uses the DO-219AB (SOD-123W) package: 3.9 mm × 1.9 mm × 1.08 mm with cathode bar marking. It is fully compatible with standard reflow soldering per J-STD-020, supporting peak temperatures up to 260 °C for ≤30 seconds. The package meets MSL level 1 and requires no dry-pack handling; its low profile enables placement adjacent to connectors on thin PCBs used in automotive telematics modules.
SMF14A-HM3-08 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-HM3-08 FAQ
1.How can I place an order for SMF14A-HM3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF14A-HM3-08 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-HM3-08 reliable?
The price and inventory of SMF14A-HM3-08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF14A-HM3-08 is usually 5 days.
3.What payment methods are accepted for SMF14A-HM3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF14A-HM3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF14A-HM3-08?
SMF14A-HM3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF14A-HM3-08 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-HM3-08?
For technical support, including SMF14A-HM3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF14A-HM3-08 requirements.
6.How does Aetrix verify that SMF14A-HM3-08 is sourced from the original manufacturer or authorized distributors?
All SMF14A-HM3-08 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-HM3-08 meets industry standards.
7.What is the process for return or replacement of SMF14A-HM3-08?
All SMF14A-HM3-08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF14A-HM3-08, 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-HM3-08 part is unused and in its original packaging.
Return procedure for SMF14A-HM3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF14A-HM3-08 Tags
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