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Vishay SMF12A-HM3_A18
- Part No.:
- SMF12A-HM3_A18
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF12A-HM3_A18.pdf
- Description:
- ESD PROTECTION DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,580
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Product details
Overview
SMF12A-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 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 capacitance at 1 MHz - optimized for USB 2.0, HDMI, and industrial I/O port protection.
For engineers reviewing the SMF12A-HM3_A18 datasheet, SMF12A-HM3_A18 pinout, SMF12A-HM3_A18 application, or SMF12A-HM3_A18 equivalent, this device delivers verified ±30 kV IEC 61000-4-2 ESD immunity, AEC-Q101 qualification, low 1.08 mm profile, and SOD-123W-compatible footprint - critical for space-constrained automotive and industrial PCB designs requiring robust overvoltage resilience.
Technical Context
The SMF12A-HM3_A18 operates as a unidirectional TVS diode with avalanche breakdown behavior, providing fast clamping response (<1 ns) to electrostatic discharge events. Its junction structure enables low incremental surge resistance and stable clamping performance under 10/1000 μs transients up to 200 W peak pulse power.
Designed for placement directly at I/O connectors, it interfaces between protected signal lines and ground, leveraging its 1.9 mm width and 3.9 mm length to fit tight pitch layouts while maintaining thermal resistance of 180 K/W on standard epoxy-glass PCBs with 3 mm × 3 mm Cu pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 12 V - maximum continuous reverse operating voltage before conduction begins; defines safe signal swing range for protected lines. |
| Reverse Breakdown (VBR) | 13.3–14.7 V at 1 mA - guaranteed avalanche onset range ensuring predictable turn-on during transients. |
| Peak Pulse Current (IPPM) | 10.1 A (10/1000 μs) - maximum non-destructive surge current capability for IEC 61000-4-5 compliance. |
| Clamping Voltage (VC) | 19.9 V max at IPPM - limits voltage seen by downstream ICs during ESD events, protecting 3.3 V/5 V logic interfaces. |
| Capacitance (CD) | 483 pF at 0 V, 1 MHz - measured signal-line loading; suitable for ≤480 Mbps interfaces like USB 2.0 but not USB 3.x or PCIe Gen3. |
| ESD Rating | ±30 kV contact & air discharge per IEC 61000-4-2 - exceeds Level 4 immunity requirements for industrial and automotive end-equipment. |
| Package | DO-219AB (SOD-123W-compatible) - low-profile (1.08 mm height), wave/reflow solderable, MSL level 1, RoHS-compliant. |
Pinout & Package
SMF12A-HM3_A18 uses the DO-219AB (SMF) surface-mount package: cathode-marked, two-terminal unidirectional configuration. Dimensions: 3.9 mm × 1.9 mm × 1.08 mm (L × W × H), with recommended footprint per Vishay S8-V-3915.01-001.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Signal line input / protected node | Connected to the line requiring ESD protection (e.g., USB D+, HDMI TMDS+); conducts during positive transients when cathode is grounded. |
| Cathode | Ground reference / return path | Connected to system ground plane; provides low-impedance path for surge current dissipation during both polarities of IEC 61000-4-2 discharge. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Enables reliable suppression of high-energy surges without degradation in industrial environments with repetitive noise exposure. |
| ±30 kV IEC 61000-4-2 ESD immunity | Meets highest severity level for contact and air discharge, eliminating need for secondary protection stages in front-end I/O design. |
| AEC-Q101 qualified | Validated for automotive applications including infotainment and body electronics where temperature cycling and long-term reliability are critical. |
| Low-profile DO-219AB package | 1.08 mm height allows integration beneath connectors or in stacked PCB assemblies without mechanical interference. |
| "Low Noise" fast-response technology | Sub-nanosecond response time ensures clamping occurs before sensitive downstream ICs experience overstress. |
Applications
| USB 2.0 Interface Protection | HDMI Source Port Protection |
|---|---|
Use Scenario: Protecting USB 2.0 D+/D− lines on host controllers against ESD events during cable insertion or handling. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed at connector edge, clamping transients before they reach the USB PHY or controller IC. Use Value: Maintains signal integrity with 483 pF capacitance while delivering ±30 kV ESD immunity - sufficient for full-speed (480 Mbps) operation without data corruption. | Use Scenario: Shielding HDMI source-side TMDS channels from ESD during hot-plug events in set-top boxes or AV receivers. IC Role / Device Role / Timing Role: Standalone ESD suppressor on each differential pair, referenced to chassis ground to prevent common-mode coupling into receiver circuitry. Use Value: Clamps to ≤19.9 V during 10.1 A surges, preserving HDMI sink compatibility and preventing latch-up in 3.3 V compliant receivers. |
| Automotive Body Control Module I/O | Industrial CAN FD Transceiver Protection |
Use Scenario: Safeguarding LIN bus or sensor inputs in door modules or lighting control units exposed to harsh ESD environments. IC Role / Device Role / Timing Role: Primary ESD clamp on low-speed analog/digital I/O pins, mounted adjacent to connectors per AEC-Q101 stress test requirements. Use Value: Withstands -65 °C to +175 °C operating range and passes AEC-Q101 HBM >8 kV, enabling drop-in use in under-hood and cabin modules. | Use Scenario: Adding secondary ESD protection upstream of a CAN FD transceiver in factory automation gateways. IC Role / Device Role / Timing Role: Signal-line TVS element on CANH/CANL lines, used alongside common-mode chokes to meet ISO 11898-2 immunity targets. Use Value: 12 V VRWM aligns with CAN FD's 5 V nominal common-mode range; 19.9 V VC prevents transceiver damage while allowing fault-tolerant bus operation. |
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 (Vishay) | Same VRWM (12 V) and VC (20.1 V), but SMA package (DO-214AC) - 2.4 mm height, higher RthJA (150 K/W). | Less suitable for ultra-low-profile designs; better thermal dissipation on large copper areas. | Select SMAJ12A-E3/5A when board space permits taller components and higher surge energy handling is prioritized over height. |
| TPD2E001DRYR (TI) | Lower capacitance (13 pF), dual-channel, but lower IPPM (4 A) and no AEC-Q101 rating; 5 V VRWM only. | Targeted at high-speed digital interfaces (e.g., USB 3.0), not 12 V rail protection. | Choose TPD2E001DRYR only for low-capacitance, multi-line protection where VRWM and AEC-Q101 are not required. |
Compared with SMAJ12A-E3/5A and TPD2E001DRYR, SMF12A-HM3_A18 uniquely balances ultra-low profile (1.08 mm), AEC-Q101 qualification, and 12 V standoff - making it optimal for automotive and space-constrained industrial I/O where mechanical clearance and automotive-grade reliability are mandatory.
Availability
SMF12A-HM3_A18 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, automotive body control module I/O, and industrial CAN FD transceiver protection requiring stable component supply across production lifecycles.
Supply support for SMF12A-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 manufacturer of discrete semiconductors and passive components, specializing in high-reliability solutions for automotive, industrial, and computing markets.
The SMF series is part of Vishay's eSMP® family of surface-mount TVS diodes, engineered specifically for compact, high-immunity ESD protection in automotive and industrial edge-node applications.
FAQ
What is the maximum clamping voltage of the SMF12A-HM3_A18 under a 10/1000 μs surge?
The SMF12A-HM3_A18 has a maximum clamping voltage (VC) of 19.9 V when subjected to its rated peak pulse current of 10.1 A using the 10/1000 μs waveform. This value is specified in the Electrical Characteristics table of Vishay's document 85881 and ensures downstream 3.3 V or 5 V ICs remain within safe operating limits during ESD events.
Is SMF12A-HM3_A18 qualified to AEC-Q101 standards?
Yes, SMF12A-HM3_A18 is AEC-Q101 qualified, as confirmed in the Features section and Ordering Information table of Vishay's SMF5V0A–SMF58A datasheet (Rev. 2.4). This qualification covers stress tests including HBM (>8 kV), temperature cycling, and high-temperature operating life - validating its suitability for automotive electronics.
What package type does SMF12A-HM3_A18 use, and is it compatible with automated assembly?
SMF12A-HM3_A18 uses the DO-219AB (SMF) package, also described as compatible with SOD-123W outlines. It is fully wave and reflow solderable, rated MSL level 1, and supports standard pick-and-place processes - confirmed in the Package Data and Features sections of Vishay's documentation.
Does SMF12A-HM3_A18 support bidirectional ESD protection?
No, SMF12A-HM3_A18 is a unidirectional TVS diode, as indicated by its single reverse breakdown specification (VBR min/max) and cathode marking. For bidirectional protection, Vishay offers the SMBJ12CA or SMCJ12CA families - SMF12A-HM3_A18 is intended for DC-biased lines where polarity is fixed, such as power-supply rails or single-ended I/O with defined ground reference.
What is the typical capacitance of SMF12A-HM3_A18 at 1 MHz, and how does it affect high-speed signal lines?
The typical capacitance of SMF12A-HM3_A18 is 483 pF at 0 V and 1 MHz, per the Electrical Characteristics table. This value imposes measurable loading on signals above ~10 MHz; it is appropriate for USB 2.0 (480 Mbps) and RS-485 but not for USB 3.x, HDMI 2.0, or PCIe, where sub-20 pF devices are required to avoid signal integrity loss.
SMF12A-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):
- 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_A18 FAQ
1.How can I place an order for SMF12A-HM3_A18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF12A-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 SMF12A-HM3_A18 reliable?
The price and inventory of SMF12A-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 SMF12A-HM3_A18 is usually 5 days.
3.What payment methods are accepted for SMF12A-HM3_A18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF12A-HM3_A18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF12A-HM3_A18?
SMF12A-HM3_A18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF12A-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 SMF12A-HM3_A18?
For technical support, including SMF12A-HM3_A18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF12A-HM3_A18 requirements.
6.How does Aetrix verify that SMF12A-HM3_A18 is sourced from the original manufacturer or authorized distributors?
All SMF12A-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 SMF12A-HM3_A18 meets industry standards.
7.What is the process for return or replacement of SMF12A-HM3_A18?
All SMF12A-HM3_A18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF12A-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 SMF12A-HM3_A18 part is unused and in its original packaging.
Return procedure for SMF12A-HM3_A18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF12A-HM3_A18 Tags
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