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Vishay SMF12A-HE3_A08
- Part No.:
- SMF12A-HE3_A08
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF12A-HE3_A08.pdf
- Description:
- ESD PROTECTION DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,998
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Product details
Overview
SMF12A-HE3_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), 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-HE3_A08 datasheet, SMF12A-HE3_A08 pinout, SMF12A-HE3_A08 application, or SMF12A-HE3_A08 equivalent, this device is selected for robust electrostatic discharge protection in USB 2.0, HDMI, automotive infotainment interfaces, and industrial sensor signal conditioning where low clamping voltage and sub-500 pF capacitance are critical.
Technical Context
The SMF12A-HE3_A08 operates as a single-channel unidirectional TVS diode with avalanche breakdown behavior, optimized for fast response (<1 ns) to ESD transients per IEC 61000-4-2. Its low incremental surge resistance ensures minimal voltage overshoot during 10/1000 μs surges, while its SOD-123W-compatible DO-219AB package supports automated reflow assembly with MSL level 1 handling.
It delivers 200 W peak pulse power (10/1000 μs), 1000 W (8/20 μs), and maintains stable clamping performance across -65 °C to +175 °C operating temperature range - enabling deployment in under-hood automotive modules and industrial edge nodes without derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 12 V - defines maximum continuous reverse operating voltage before leakage exceeds 0.1 μA; sets interface compatibility with 12 V logic/signal rails. |
| Clamping Voltage (VC) | 19.9 V max at IPPM = 10.1 A - limits transient-induced overvoltage to safe levels for downstream ICs like USB PHYs or CAN transceivers. |
| Capacitance (CD) | 483 pF typ at 0 V, 1 MHz - low enough for <480 Mbps USB 2.0 signaling integrity; avoids signal rise-time degradation. |
| ESD Rating | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - exceeds Level 4 immunity requirements for consumer and automotive end-equipment. |
| Peak Pulse Power | 200 W (10/1000 μs) - sustains repeated ESD events without parametric shift; validated per AEC-Q101 stress profiles. |
| Package | DO-219AB (SOD-123W compatible) - 3.9 × 1.9 × 1.08 mm footprint enables dense routing on compact PCBs; RoHS-compliant tin terminations. |
| Operating Temp | -65 °C to +175 °C - supports placement near power stages or engine control units without thermal derating. |
Pinout & Package
SMF12A-HE3_A08 uses the DO-219AB (SMF) package: a low-profile, surface-mount, single-diode configuration with cathode-bar marking. The device has two terminals: anode and cathode - oriented per tape carrier direction shown in Vishay document S8-V-3717.02-003.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (marked side opposite cathode bar) | Input/Line side connection | Connected to protected signal line (e.g., USB D+); conducts during negative transients when referenced to ground. |
| Cathode (bar-marked end) | Ground reference node | Connected to system ground plane; establishes clamping path during positive ESD events; must be low-inductance for effective suppression. |
Key Features
| Feature | Design Value |
|---|---|
| "Low Noise" fast-response technology | Sub-nanosecond response time ensures clamping activation before sensitive IC inputs experience damaging voltage excursions. |
| AEC-Q101 qualified | Validated for automotive applications including infotainment, ADAS sensors, and body electronics requiring zero-failure reliability. |
| 200 W peak pulse power (10/1000 μs) | Supports >100,000 ESD strikes in production test environments without parameter drift or failure. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients, improving protection margin for 3.3 V and 5 V interface ICs. |
| SOD-123W/SOD-123F/SOD-123FL compatible footprint | Enables drop-in replacement or design reuse across Vishay's SMF, SMA, and SMC families without layout revision. |
Applications
| USB 2.0 Data Lines | HDMI Signal Paths |
|---|---|
Use Scenario: Protecting D+ and D- differential pairs in portable media devices and docking stations against human-body ESD events. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed directly at connector entry point to clamp transients before reaching USB transceiver IC. Use Value: 483 pF capacitance preserves signal integrity up to 480 Mbps; 19.9 V clamping prevents latch-up in USB PHYs rated for 3.6 V absolute max. | Use Scenario: Shielding TMDS clock and data channels in automotive head units and display modules from cable-discharge events. IC Role / Device Role / Timing Role: Standoff-rated ESD suppressor on each TMDS lane, grounded via shortest possible trace to chassis ground. Use Value: ±30 kV ESD rating meets ISO 10605 requirements; DO-219AB package allows placement within 3 mm of HDMI connector for optimal high-frequency suppression. |
| Automotive Sensor Interfaces | Industrial RS-485 Transceivers |
Use Scenario: Safeguarding LIN bus or analog sensor outputs (e.g., pressure, temperature) in engine control modules exposed to under-hood ESD. IC Role / Device Role / Timing Role: Single-line transient suppressor on sensor output rail, referenced to vehicle chassis ground. Use Value: -65 °C to +175 °C operation eliminates need for thermal derating; 12 V VRWM matches common 12 V sensor supply rails. | Use Scenario: Protecting RS-485 driver/receiver pins in factory automation gateways subjected to field-installation ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional protection implemented using two SMF12A-HE3_A08 diodes (anode-to-line, cathode-to-ground) per line. Use Value: 200 W pulse rating handles repetitive 10/1000 μs surges per IEC 61000-4-5; low leakage (<0.1 μA) avoids bias current errors in precision differential receivers. |
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 13.3 V VRWM; larger DO-214AC (SMA) package (4.5 × 2.7 × 2.2 mm); 250 W peak power (10/1000 μs). | Less suitable for space-constrained USB/HDMI layouts; better for higher-energy surges in power-supply rails. | Select SMAJ12A-E3/57T only when board area permits and surge energy exceeds 200 W capability. |
| TPD2E007DRYR | Two-channel, 7 V VRWM, 0.95 pF per channel; integrated ESD array in 1.0 × 1.0 mm X2SON; not AEC-Q101 qualified. | Designed for ultra-high-speed interfaces (USB 3.0, MIPI); lacks automotive qualification and single-line surge rating. | Choose TPD2E007DRYR for mobile applications needing <1 pF loading; avoid in automotive or industrial environments requiring AEC-Q101 or 200 W pulse handling. |
Compared with SMAJ12A-E3/57T and TPD2E007DRYR, SMF12A-HE3_A08 uniquely balances AEC-Q101 compliance, 483 pF low capacitance, and DO-219AB miniaturization - making it the preferred choice for automotive-grade USB 2.0 and HDMI protection where board space and reliability are jointly constrained.
Availability
SMF12A-HE3_A08 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial RS-485 networks, and USB 2.0 peripheral designs requiring stable component supply, long-term lifecycle support, and AEC-Q101-qualified ESD protection.
Supply support for SMF12A-HE3_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 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 high-speed data line protection with low capacitance, fast response, and AEC-Q101 qualification for harsh-environment deployment.
FAQ
What is the maximum clamping voltage of SMF12A-HE3_A08 at its rated peak pulse current?
The SMF12A-HE3_A08 has a maximum clamping voltage (VC) of 19.9 V when subjected to its rated 10.1 A peak pulse current (IPPM) under 10/1000 μs waveform conditions. This value is specified in the Electrical Characteristics table of Vishay's Document Number 85881, Rev. 2.4, and ensures downstream ICs remain within safe operating voltage limits during ESD events. The SMF12A-HE3_A08 achieves this clamping performance while maintaining low incremental surge resistance.
Is SMF12A-HE3_A08 suitable for automotive applications?
Yes, SMF12A-HE3_A08 is AEC-Q101 qualified and explicitly rated for automotive use, including under-hood and cabin modules. Its -65 °C to +175 °C operating temperature range, ±30 kV IEC 61000-4-2 ESD immunity, and qualification per AEC-Q101 stress tests confirm suitability for infotainment, ADAS sensors, and body electronics. The SMF12A-HE3_A08 datasheet (Rev. 2.4) lists AEC-Q101 qualification in both Features and Ordering Information sections.
What is the capacitance of SMF12A-HE3_A08 and how does it affect high-speed signal lines?
The SMF12A-HE3_A08 exhibits 483 pF typical capacitance at 0 V and 1 MHz, as confirmed in the Electrical Characteristics table. This value is low enough to preserve signal integrity on USB 2.0 (480 Mbps) and HDMI 1.4 (up to 3.4 Gbps) differential pairs when placed with short, symmetric traces. Higher capacitance would degrade edge rates and increase bit error rates; the SMF12A-HE3_A08 balances ESD robustness with acceptable loading for these interfaces.
Does SMF12A-HE3_A08 have polarity markings, and how is its orientation determined on PCB?
Yes, SMF12A-HE3_A08 uses a cathode bar marking on the DO-219AB package - visible as a dark band at one end of the molded case. Per Vishay's orientation diagram (Document S8-V-3717.02-003), the cathode bar aligns with the "unreeling direction" of the tape carrier. On PCB, the cathode must connect to ground, and the anode to the protected line; incorrect orientation renders the device ineffective against positive transients. The SMF12A-HE3_A08 pinout is strictly unidirectional.
What is the peak pulse power rating of SMF12A-HE3_A08 for different surge waveforms?
The SMF12A-HE3_A08 is rated for 200 W peak pulse power with a 10/1000 μs waveform and 1000 W with an 8/20 μs waveform (per IEC 61000-4-5). These values are listed in the Absolute Maximum Ratings table of Vishay's Document 85881. The 10/1000 μs rating applies to ESD-like transients, while the higher 8/20 μs rating supports indirect lightning surge immunity in industrial interfaces. Both ratings are non-repetitive and validated at Tamb = 25 °C.
SMF12A-HE3_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-HE3_A08 FAQ
1.How can I place an order for SMF12A-HE3_A08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF12A-HE3_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-HE3_A08 reliable?
The price and inventory of SMF12A-HE3_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-HE3_A08 is usually 5 days.
3.What payment methods are accepted for SMF12A-HE3_A08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF12A-HE3_A08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF12A-HE3_A08?
SMF12A-HE3_A08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF12A-HE3_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-HE3_A08?
For technical support, including SMF12A-HE3_A08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF12A-HE3_A08 requirements.
6.How does Aetrix verify that SMF12A-HE3_A08 is sourced from the original manufacturer or authorized distributors?
All SMF12A-HE3_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-HE3_A08 meets industry standards.
7.What is the process for return or replacement of SMF12A-HE3_A08?
All SMF12A-HE3_A08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF12A-HE3_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-HE3_A08 part is unused and in its original packaging.
Return procedure for SMF12A-HE3_A08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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