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Vishay SMF12A-HM3_A08
- Part No.:
- SMF12A-HM3_A08
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF12A-HM3_A08.pdf
- Description:
- ESD PROTECTION DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,064
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Product details
Overview
SMF12A-HM3_A08 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in the SMF (DO-219AB) package, designed for low-capacitance transient voltage suppression in high-speed data lines. It features a 12 V stand-off voltage (VRWM), 13.3–14.7 V reverse breakdown (VBR), 10.1 A peak pulse current (IPPM), 19.9 V maximum clamping voltage (VC), and 483 pF typical junction capacitance at 0 V - optimized for USB 2.0, HDMI, and industrial I/O port protection.
For engineers reviewing the SMF12A-HM3_A08 datasheet, SMF12A-HM3_A08 pinout, SMF12A-HM3_A08 application, or SMF12A-HM3_A08 equivalent, this device delivers verified ±30 kV IEC 61000-4-2 ESD immunity, AEC-Q101 qualification, and low-noise fast-response clamping - critical for automotive infotainment interfaces, industrial sensor nodes, and portable medical data ports requiring robust electrostatic discharge resilience without signal integrity degradation.
Technical Context
This unidirectional TVS diode operates in avalanche mode to clamp transients above its breakdown threshold while maintaining low leakage (<0.1 µA at VRWM) and minimal parasitic capacitance. Its DO-219AB package enables high thermal dissipation (RthJA = 180 K/W) and supports wave/reflow soldering with peak temperature up to 260 °C.
The device meets IEC 61000-4-5 (8/20 µs, 1000 W) and IEC 61000-4-2 (±30 kV contact/air) standards, with H3B-class human body model ESD rating (>8 kV) per AEC-Q101. Its 1.08 mm height and SOD-123W-compatible footprint allow dense PCB layout in space-constrained applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 12 V - maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 12 V nominal bus systems. |
| Breakdown Voltage (VBR) | 13.3–14.7 V at 1 mA - precise avalanche onset range ensures reliable triggering without premature conduction. |
| Clamping Voltage (VC) | 19.9 V at 10.1 A (10/1000 µs) - limits downstream IC voltage stress during surge events, protecting 20 V-tolerant receivers. |
| Junction Capacitance (CD) | 483 pF at 0 V, 1 MHz - low enough for USB 2.0 (480 Mbps) and RS-485 signaling without measurable rise-time degradation. |
| ESD Rating | ±30 kV contact / ±30 kV air per IEC 61000-4-2 - exceeds Level 4 immunity requirements for consumer and automotive end-equipment. |
| Peak Pulse Power | 200 W (10/1000 µs), 1000 W (8/20 µs) - sustains multi-pulse surges in industrial power supply monitoring and CAN FD stub lines. |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock testing. |
Pinout & Package
SMF12A-HM3_A08 uses the DO-219AB (SOD-123W-compatible) surface-mount package: 3.9 mm × 1.9 mm × 1.08 mm, cathode-marked with bar, MSL level 1, UL 94 V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side | Connected to protected signal line; conducts surge current toward ground when reverse-biased beyond VBR. |
| Cathode | Ground reference | Connected to system ground plane; establishes clamping path and defines unidirectional polarity. |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile DO-219AB package | 1.08 mm max height enables placement under connectors and in stacked-board assemblies. |
| "Low Noise" fast response | Sub-nanosecond turn-on time minimizes overshoot during ESD events, preserving signal fidelity on high-speed buses. |
| Wave and reflow solderable | Compatible with standard SMT processes including lead-free reflow (peak 260 °C), eliminating hand-soldering risk. |
| Low incremental surge resistance | Ensures stable clamping voltage across varying surge amplitudes - critical for repeatable protection in factory automation sensors. |
| AEC-Q101 qualified variants available | Validated for automotive under-hood and infotainment modules requiring extended temperature (-65 °C to +175 °C) operation. |
Applications
| USB 2.0 Data Lines | HDMI Interface Protection |
|---|---|
Use Scenario: Protecting D+ and D− differential pairs in portable docking stations against user-handling ESD. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between connector and USB transceiver IC. Use Value: 483 pF capacitance avoids signal distortion at 480 Mbps; ±30 kV ESD rating prevents latch-up in host controller ICs. |
Use Scenario: Shielding TMDS clock and data channels in automotive head-unit displays from cable-discharge events. IC Role / Device Role / Timing Role: Point-of-entry TVS on each TMDS lane, referenced to chassis ground. Use Value: 19.9 V clamping voltage stays below HDMI receiver absolute max rating (22 V), preventing permanent damage. |
| Industrial Sensor I/O Ports | Automotive Infotainment USB-C |
Use Scenario: Safeguarding 4–20 mA analog input circuits and digital GPIOs on PLC modules exposed to field wiring surges. IC Role / Device Role / Timing Role: Bidirectional protection not required; unidirectional SMF12A-HM3_A08 used with proper DC biasing. Use Value: 12 V VRWM aligns with common 12 V sensor supply rails; 10.1 A IPPM handles induced lightning-induced transients. |
Use Scenario: ESD hardening of USB-C CC and SBU pins in vehicle-mounted media hubs subject to frequent plug/unplug cycles. IC Role / Device Role / Timing Role: Discrete TVS on each auxiliary pin, leveraging compact DO-219AB footprint for tight routing near connector. Use Value: AEC-Q101 qualification ensures compliance with automotive environmental stress tests; 1.08 mm height avoids interference with USB-C receptacle mounting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12A-E3/57T | Higher clamping voltage (23.2 V), larger SMA (DO-214AC) package (4.5 mm × 2.7 mm), 600 pF capacitance. | Less suitable for USB 2.0 due to higher CD; better for 24 V industrial power rail protection where size is less constrained. | Select SMAJ12A-E3/57T only if board space allows larger footprint and higher clamping is acceptable for downstream 24 V tolerant ICs. |
| TPD2E001DRYR | Integrated dual-channel ESD array (2-line), 12 pF capacitance, 5.5 V VRWM, SC-70 package. | Designed for ultra-high-speed interfaces (USB 3.0, MIPI); incompatible with 12 V bus systems due to lower VRWM. | Choose TPD2E001DRYR only for sub-6 V data lines requiring <15 pF loading; not a functional replacement for 12 V signal protection. |
Compared with SMAJ12A-E3/57T and TPD2E001DRYR, SMF12A-HM3_A08 uniquely balances 12 V system compatibility, 483 pF bandwidth, AEC-Q101 qualification, and ultra-low profile - making it optimal for space-limited automotive and industrial data interface protection where both voltage rating and signal integrity are critical.
Availability
SMF12A-HM3_A08 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, HDMI channel hardening, and industrial sensor I/O port surge suppression requiring stable component supply across automotive Tier-1 production and industrial OEM programs.
Supply support for SMF12A-HM3_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 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, specifically engineered for ESD-hardened interfaces in automotive infotainment, industrial IoT gateways, and medical data acquisition systems.
FAQ
What is the maximum clamping voltage of SMF12A-HM3_A08 under a 10/1000 µs surge?
The SMF12A-HM3_A08 has a maximum clamping voltage (VC) of 19.9 V when subjected to a 10.1 A peak pulse current with a 10/1000 µs waveform. This value is measured per the conditions specified in Vishay's official datasheet (Document Number: 85881, Rev. 2.4), ensuring predictable overvoltage limiting for downstream 20 V-rated ICs in real-world surge events.
Is SMF12A-HM3_A08 qualified to AEC-Q101 for automotive use?
Yes, SMF12A-HM3_A08 is AEC-Q101 qualified, having passed stress tests including temperature cycling, high-temperature operating life, and ESD robustness per the AEC-Q101 standard. The qualification applies specifically to the SMF12A variant in the HE3_A08 packaging configuration, as confirmed in Vishay's ordering information table and revision 2.4 of document 85881.
What is the junction capacitance of SMF12A-HM3_A08 at 0 V and 1 MHz?
The typical junction capacitance (CD) of SMF12A-HM3_A08 is 483 pF at 0 V reverse bias and 1 MHz frequency, as published in the "Electrical Characteristics" table of Vishay's SMF5V0A to SMF58A datasheet. This value is measured under standardized conditions and supports design validation for USB 2.0 and other high-speed interfaces where capacitive loading must remain below 500 pF.
Does SMF12A-HM3_A08 have bidirectional or unidirectional ESD protection?
SMF12A-HM3_A08 is a unidirectional ESD protection diode, configured as a single avalanche junction with anode and cathode terminals. Its electrical characteristics - including reverse breakdown voltage, stand-off voltage, and clamping behavior - are defined only for reverse-biased operation, as confirmed by the "Nchannel" column and parameter definitions in the Vishay datasheet (page 2).
What package type does SMF12A-HM3_A08 use, and is it compatible with automated SMT assembly?
SMF12A-HM3_A08 uses the DO-219AB (SOD-123W-compatible) surface-mount package, with dimensions of 3.9 mm × 1.9 mm × 1.08 mm and MSL level 1 rating. It is fully compatible with standard wave and reflow soldering processes, including lead-free reflow profiles with peak temperatures up to 260 °C, as documented in Vishay's package data section (page 2 of document 85881).
SMF12A-HM3_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):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 10.1A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 483pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF12A-HM3_A08 FAQ
1.How can I place an order for SMF12A-HM3_A08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF12A-HM3_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 SMF12A-HM3_A08 reliable?
The price and inventory of SMF12A-HM3_A08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF12A-HM3_A08 is usually 5 days.
3.What payment methods are accepted for SMF12A-HM3_A08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF12A-HM3_A08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF12A-HM3_A08?
SMF12A-HM3_A08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF12A-HM3_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 SMF12A-HM3_A08?
For technical support, including SMF12A-HM3_A08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF12A-HM3_A08 requirements.
6.How does Aetrix verify that SMF12A-HM3_A08 is sourced from the original manufacturer or authorized distributors?
All SMF12A-HM3_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 SMF12A-HM3_A08 meets industry standards.
7.What is the process for return or replacement of SMF12A-HM3_A08?
All SMF12A-HM3_A08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF12A-HM3_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 SMF12A-HM3_A08 part is unused and in its original packaging.
Return procedure for SMF12A-HM3_A08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF12A-HM3_A08 Tags
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