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Vishay General Semiconductor - Diodes Division SMF12A-HM3-08
- Part No.:
- SMF12A-HM3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF12A-HM3-08.pdf
- Description:
- TVS DIODE 12VWM 19.9VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:29,990
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Product details
Overview
SMF12A-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 12 V stand-off voltage (VRWM), 19.9 V maximum clamping voltage at 10.1 A peak pulse current, 483 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 SMF12A-HM3-08 datasheet, SMF12A-HM3-08 pinout, SMF12A-HM3-08 application, or SMF12A-HM3-08 equivalent, this device is selected for robust, low-clamping ESD protection in USB 2.0, HDMI, automotive infotainment interfaces, and industrial sensor signal conditioning where capacitance <500 pF and fast response are critical.
Technical Context
This diode operates as a unidirectional avalanche clamp, leveraging silicon planar technology to deliver sub-nanosecond response time and low incremental surge resistance. Its junction design enables stable clamping under 10/1000 μs transients while maintaining low leakage (<0.1 μA at VRWM) and high thermal robustness (TJ = -65 °C to +175 °C).
The DO-219AB package supports wave and reflow soldering per J-STD-020 MSL level 1, with 1.08 mm max height and 3.9 mm × 1.9 mm footprint optimized for space-constrained PCB layouts. Its cathode-bar marking aligns with industry-standard polarity identification for automated assembly verification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 12 V - Maximum continuous reverse voltage before significant leakage; sets operating margin for 12 V nominal bus lines. |
| Clamping Voltage (VC) | 19.9 V at 10.1 A - Peak voltage seen by protected circuit during 10/1000 μs surge; ensures downstream ICs remain within safe absolute max ratings. |
| Peak Pulse Power (PPP) | 200 W (10/1000 μs) - Sustains transient energy without degradation; sufficient for IEC 61000-4-5 Level 3 surges. |
| Capacitance (CD) | 483 pF at 0 V, 1 MHz - Low enough for USB 2.0 (480 Mbps) signal integrity; avoids excessive rise-time degradation. |
| ESD Rating | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - Meets highest system-level ESD immunity requirements for exposed ports. |
| AEC-Q101 Qualified | Yes - Validated for automotive underhood and cabin applications per stress test conditions including HBM >8 kV. |
| Operating Temp Range | -65 °C to +175 °C - Supports extended-range operation in engine control units and powertrain modules. |
Pinout & Package
SMF12A-HM3-08 uses the DO-219AB (SOD-123W) surface-mount package: 3.9 mm × 1.9 mm × 1.08 mm, low-profile, MSL level 1, with cathode indicated by a bar marking on the top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input side of protection path | Connected to signal line being protected; conducts surge current toward ground when clamped. |
| Cathode | Output side / reference node | Connected to system ground or low-impedance return path; defines unidirectional conduction direction and clamping reference. |
Key Features
| Feature | Design Value |
|---|---|
| Low Clamping Voltage | 19.9 V at 10.1 A - Minimizes voltage overshoot on protected IC pins, reducing risk of gate oxide damage in 3.3 V/5 V logic. |
| "Low Noise" Fast Response | Sub-nanosecond turn-on - Limits transient duration before clamping engages, preserving signal edge fidelity on high-speed buses. |
| AEC-Q101 Qualification | Validated for automotive reliability - Includes temperature cycling, humidity bias, and mechanical shock testing per AEC standard. |
| SOD-123W Compatibility | Drop-in compatible with legacy SOD-123F/FL footprints - Enables upgrade to higher surge rating without PCB redesign. |
| Reflow/Wave Solderable | Peak temp ≤260 °C - Supports standard lead-free assembly processes without delamination or parameter shift. |
Applications
| USB 2.0 Data Lines | HDMI Signal Paths |
|---|---|
Use Scenario: Protecting D+ and D- lines in portable USB host/device ports against ESD events during cable insertion or handling. IC Role / Device Role / Timing Role: Unidirectional transient voltage suppressor placed between connector and USB transceiver IC. Use Value: 483 pF capacitance avoids signal integrity loss at 480 Mbps; ±30 kV ESD rating exceeds IEC 61000-4-2 system-level test requirements. | Use Scenario: Shielding TMDS clock and data channels in automotive infotainment head units from hot-plug and ESD-induced glitches. IC Role / Device Role / Timing Role: Point-of-entry ESD clamp on differential pairs upstream of HDMI receiver PHY. Use Value: 19.9 V clamping ensures HDMI 1.4 receiver inputs (max 3.6 V) remain undamaged during 12 V common-mode surges. |
| Automotive Sensor Interfaces | Industrial CAN FD Transceivers |
Use Scenario: Safeguarding analog outputs of pressure/temperature sensors in engine control modules exposed to under-hood ESD. IC Role / Device Role / Timing Role: Low-leakage (0.1 μA) clamp on 0–5 V sensor output lines tied to microcontroller ADC inputs. Use Value: -65 °C to +175 °C operating range matches under-hood thermal profiles; 12 V VRWM aligns with 5 V supply rails with safety margin. | Use Scenario: Adding secondary ESD protection on CAN_H/CAN_L lines downstream of integrated transceivers in vehicle body control modules. IC Role / Device Role / Timing Role: Standalone bidirectional-capable unidirectional clamp (used in back-to-back configuration) augmenting built-in transceiver protection. Use Value: 200 W peak pulse power handles coupled transients exceeding ISO 16750-2; DO-219AB footprint allows placement near connector entry point. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12A-E3/5A | Higher clamping voltage (23.2 V), larger SMA package (4.5 mm × 2.7 mm), 500 pF capacitance | Less suitable for USB 2.0 due to higher capacitance and slower response; better for lower-speed power-line protection | Select SMAJ12A-E3/5A only if board space permits larger footprint and signal bandwidth <100 Mbps |
| TPD2E001DRYR | Integrated dual-channel TVS in 1.0 mm × 1.0 mm X2SON, 12 pF capacitance, but rated only to ±8 kV ESD | Optimized for ultra-high-speed digital interfaces (e.g., USB 3.0), not automotive-grade ESD robustness | Choose TPD2E001DRYR for space-critical consumer electronics with lower ESD threat levels; not recommended for AEC-Q101 environments |
Compared with SMAJ12A-E3/5A and TPD2E001DRYR, SMF12A-HM3-08 uniquely balances automotive qualification, 483 pF low capacitance, ±30 kV ESD rating, and compact DO-219AB packaging-making it optimal for cost-sensitive, high-reliability 12 V interface protection where both speed and ruggedness are required.
Availability
SMF12A-HM3-08 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor signal conditioning, USB 2.0 peripheral protection, and CAN FD interface hardening requiring stable component supply across multi-year production cycles.
Supply support for SMF12A-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 AEC-Q101 qualification, emphasizing low capacitance, precise clamping, and robust surge handling for next-generation automotive and industrial connectivity interfaces.
FAQ
What is the clamping voltage of SMF12A-HM3-08 at its rated peak pulse current?
The SMF12A-HM3-08 has a maximum clamping voltage (VC) of 19.9 V when subjected to its rated 10.1 A peak pulse current (IPPM) under a 10/1000 μs waveform. This value is measured per IEC 61000-4-5 test conditions and ensures protected circuits remain within safe voltage limits during surge events. The SMF12A-HM3-08 maintains this performance across its full operating temperature range.
Is SMF12A-HM3-08 qualified for automotive applications?
Yes, SMF12A-HM3-08 is AEC-Q101 qualified, having passed stress tests including human body model ESD (>8 kV), temperature cycling, and high-temperature operating life. It is rated for operation from -65 °C to +175 °C, making it suitable for under-hood and cabin automotive applications such as infotainment, ADAS sensor interfaces, and body control modules. The SMF12A-HM3-08 meets automotive reliability standards without derating.
What package type does SMF12A-HM3-08 use, and is it compatible with standard SOD-123 footprints?
SMF12A-HM3-08 uses the DO-219AB package (also known as SOD-123W), measuring 3.9 mm × 1.9 mm × 1.08 mm. It is mechanically and thermally compatible with standard SOD-123F and SOD-123FL footprints, enabling drop-in replacement in existing designs. The cathode is marked with a bar on the top surface, and the device supports both wave and reflow soldering per J-STD-020 MSL level 1. The SMF12A-HM3-08's low-profile form factor aids dense PCB layouts.
How does the capacitance of SMF12A-HM3-08 affect high-speed signal integrity?
With 483 pF typical capacitance at 0 V and 1 MHz, the SMF12A-HM3-08 introduces minimal loading on 12 V DC-biased signal lines while preserving edge rates for protocols up to USB 2.0 (480 Mbps). Its capacitance decreases significantly above 1 V reverse bias, further reducing impact during active signaling. This behavior makes the SMF12A-HM3-08 appropriate for high-fidelity analog and digital interfaces where signal distortion must be avoided, unlike higher-capacitance alternatives that degrade rise time.
Can SMF12A-HM3-08 be used in bidirectional protection configurations?
No, SMF12A-HM3-08 is a unidirectional ESD protection diode and must be used with correct polarity-cathode tied to ground, anode to the line being protected. For true bidirectional protection, two SMF12A-HM3-08 devices can be connected in series opposition (anode-to-anode), forming a symmetrical clamp. This configuration is commonly applied on differential lines like CAN or RS-485. The SMF12A-HM3-08 itself does not provide intrinsic bidirectional clamping.
SMF12A-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):
- 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 (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF12A-HM3-08 FAQ
1.How can I place an order for SMF12A-HM3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF12A-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 SMF12A-HM3-08 reliable?
The price and inventory of SMF12A-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 SMF12A-HM3-08 is usually 5 days.
3.What payment methods are accepted for SMF12A-HM3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF12A-HM3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF12A-HM3-08?
SMF12A-HM3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF12A-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 SMF12A-HM3-08?
For technical support, including SMF12A-HM3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF12A-HM3-08 requirements.
6.How does Aetrix verify that SMF12A-HM3-08 is sourced from the original manufacturer or authorized distributors?
All SMF12A-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 SMF12A-HM3-08 meets industry standards.
7.What is the process for return or replacement of SMF12A-HM3-08?
All SMF12A-HM3-08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF12A-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 SMF12A-HM3-08 part is unused and in its original packaging.
Return procedure for SMF12A-HM3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF12A-HM3-08 Tags
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