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Vishay General Semiconductor - Diodes Division SMF12A-E3-08
- Part No.:
- SMF12A-E3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF12A-E3-08.pdf
- Description:
- TVS DIODE 12VWM 19.9VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:17,946
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Product details
Overview
SMF12A-E3-08 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in the SMF (DO-219AB) package, designed for low-capacitance transient voltage suppression on high-speed data lines. It features a 12 V stand-off voltage (VRWM), 13.3 V minimum breakdown voltage (VBR), 19.9 V maximum clamping voltage at 10.1 A peak pulse current, and 483 pF typical junction capacitance at 0 V - enabling robust ESD protection in USB 2.0, HDMI, and industrial I/O interfaces.
For engineers reviewing the SMF12A-E3-08 datasheet, SMF12A-E3-08 pinout, SMF12A-E3-08 application, or SMF12A-E3-08 equivalent, key selection criteria include its ±30 kV IEC 61000-4-2 contact/air discharge rating, AEC-Q101 qualification option, SOD-123W-compatible DO-219AB footprint, and low 0.1 μA reverse leakage at VRWM - critical for preserving signal integrity in automotive infotainment and industrial sensor front-ends.
Technical Context
This device operates as a single-channel unidirectional TVS diode with avalanche breakdown clamping action. Its low incremental surge resistance ensures rapid voltage limiting during ESD transients, while the "Low Noise" technology delivers sub-nanosecond response time - verified by IEC 61000-4-2 waveform compliance and 0.7–1 ns rise time in discharge testing.
The SMF12A-E3-08 is optimized for PCB-level protection of DC-coupled signal paths where capacitance must remain below 500 pF to avoid signal degradation. Its thermal resistance (RthJA = 180 K/W) and 175 °C max junction temperature support operation in under-hood automotive environments and sealed industrial enclosures without derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 12 V - defines maximum continuous operating voltage before conduction begins; sets upper limit for protected line voltage. |
| Breakdown Voltage (VBR) | 13.3–14.7 V at 1 mA - ensures reliable triggering above normal operating voltage while avoiding false clamping. |
| Clamping Voltage (VC) | 19.9 V at 10.1 A (10/1000 μs) - limits transient overvoltage to safe levels for downstream ICs like USB PHYs or CAN transceivers. |
| Junction Capacitance (CD) | 483 pF at 0 V, 1 MHz - low enough for USB 2.0 (480 Mbps) and RS-485, but not suitable for USB 3.0 or PCIe Gen3. |
| 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) - sustains multiple ESD events without degradation when mounted on standard 3 mm × 3 mm Cu pads. |
| Operating Temperature | −65 °C to +175 °C - supports deployment in engine control units, motor drives, and outdoor telecom equipment. |
Pinout & Package
SMF12A-E3-08 uses the DO-219AB (SMF) package: low-profile (1.08 mm max height), SOD-123W-compatible outline, cathode-bar marked, and qualified for wave and reflow soldering (peak 260 °C). Weight: 15 mg; dimensions: 3.9 mm × 1.9 mm × 1.08 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input side of protected line | Connected to signal trace upstream of IC input; conducts surge current toward ground during positive transients. |
| Cathode | Ground reference terminal | Must be tied to low-impedance system ground plane; forms clamping path with anode during ESD events. |
Key Features
| Feature | Design Value |
|---|---|
| IEC 61000-4-2 ESD immunity | ±30 kV contact/air - eliminates need for secondary board-level protection in Class 4-compliant designs. |
| AEC-Q101 qualification option | Available in HE3_A variants - enables use in automotive powertrain and body electronics without additional qualification effort. |
| Low-profile DO-219AB package | 1.08 mm height - fits beneath low-clearance shields and enables double-sided PCB assembly in space-constrained modules. |
| "Low Noise" fast response | <1 ns rise time - prevents overshoot propagation into sensitive analog or RF circuitry adjacent to protected lines. |
| Reflow/wave solder compatible | Rated for 260 °C peak - supports high-throughput manufacturing without special thermal profiling or post-solder inspection. |
Applications
| USB 2.0 Data Lines | HDMI DDC/CEC Channels |
|---|---|
Use Scenario: Protecting differential USB 2.0 D+/D− traces from ESD events during hot-plug insertion in portable docking stations. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between each data line and chassis ground, operating outside signal path timing constraints. Use Value: 483 pF capacitance avoids eye diagram distortion at 480 Mbps; 19.9 V clamping prevents damage to USB transceiver ESD structures rated ≤20 V. |
Use Scenario: Safeguarding HDMI DDC (I²C) and CEC control lines against user-handling ESD in home theater AV receivers. IC Role / Device Role / Timing Role: Standoff-limited TVS on 3.3 V I²C bus, positioned before level shifters to preserve logic thresholds. Use Value: 0.1 μA leakage at 12 V VRWM prevents I²C pull-up current loss; ±30 kV rating exceeds EN 55032 Class B immunity requirements. |
| Automotive Sensor Inputs | Industrial RS-485 Transceivers |
Use Scenario: Shielding analog outputs of pressure/temperature sensors in engine control modules exposed to under-hood ESD. IC Role / Device Role / Timing Role: Single-line TVS on 5 V ratiometric sensor output, co-located with connector entry point. Use Value: −65 °C to +175 °C operating range matches engine bay thermal profile; 175 °C TJ rating avoids thermal runaway during sustained load dump. |
Use Scenario: Protecting RS-485 transceiver A/B terminals in factory automation PLC I/O modules subject to cable-discharge events. IC Role / Device Role / Timing Role: Bidirectional protection implemented using two SMF12A-E3-08 devices (anode-to-anode) across differential pair. Use Value: 10.1 A IPPM handles 1 kV/500 Ω surge per IEC 61000-4-5; DO-219AB footprint allows compact placement near DB9 or terminal block connectors. |
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 high-speed data lines; better for power rail or lower-frequency analog protection | Select when higher surge margin (400 W peak power) outweighs size/capacitance penalties |
| TPD2E001DRYR | 2-channel, 15 pF per line, 5 V VRWM, integrated ESD array in USON-6 package | Designed for dual-line USB/MIPI protection; incompatible with 12 V signal rails | Choose only for 3.3–5 V high-speed digital interfaces requiring ultra-low capacitance |
Compared with SMAJ12A-E3/57T and TPD2E001DRYR, SMF12A-E3-08 uniquely balances 12 V standoff, 483 pF capacitance, and DO-219AB compactness - making it optimal for cost-sensitive, medium-speed industrial and automotive signal lines where both voltage headroom and layout area are constrained.
Availability
SMF12A-E3-08 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, automotive sensor conditioning, and industrial RS-485 node design requiring stable component supply and long-term lifecycle assurance.
Supply support for SMF12A-E3-08 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 board-level ESD protection in space-constrained, high-reliability applications - delivering AEC-Q101-qualified transient suppression in the industry's smallest standardized TVS package (DO-219AB).
FAQ
What is the maximum clamping voltage of SMF12A-E3-08 under standard test conditions?
The SMF12A-E3-08 has a maximum reverse clamping voltage (VC) of 19.9 V when subjected to a 10/1000 μs waveform at 10.1 A peak pulse current. This value is measured per IEC 61000-4-5 and ensures downstream ICs with 20 V absolute maximum ratings remain within safe operating limits during ESD events. The clamping performance is guaranteed across the full −65 °C to +175 °C operating range.
Is SMF12A-E3-08 suitable for protecting USB 3.0 SuperSpeed lines?
No, SMF12A-E3-08 is not suitable for USB 3.0 SuperSpeed (5 Gbps) differential pairs due to its 483 pF junction capacitance, which would severely degrade signal integrity and fail USB-IF compliance testing. It is validated for USB 2.0 (480 Mbps) and lower-speed interfaces like I²C, RS-232, and RS-485. For USB 3.0, low-capacitance arrays such as USBLC6-2SC6 (0.8 pF) are required.
Does SMF12A-E3-08 meet AEC-Q101 stress test requirements?
The base SMF12A-E3-08 variant is not AEC-Q101 qualified; however, Vishay offers the SMF12A-HE3_A08 variant, which is fully AEC-Q101 qualified for automotive applications. This version undergoes temperature cycling, humidity bias HAST, and ESD human-body-model testing per AEC-Q101 Rev D, with documentation available upon request. Always verify the suffix code for qualification status.
How does the DO-219AB package of SMF12A-E3-08 compare to SOD-123 in size and thermal performance?
The DO-219AB package measures 3.9 mm × 1.9 mm × 1.08 mm, matching SOD-123F/FL footprints but with 0.2 mm greater length and identical width/height. Its thermal resistance (RthJA = 180 K/W) is comparable to SOD-123 variants when mounted on 3 mm × 3 mm Cu pads. The molded compound meets UL 94 V-0 and JESD201 Class 2 whisker standards, supporting identical reflow profiles (260 °C peak).
Can SMF12A-E3-08 be used for bidirectional signal line protection?
SMF12A-E3-08 is unidirectional and must be used in pairs (anode-to-anode) to protect bidirectional lines like RS-485 A/B or CAN H/L. In this configuration, one device clamps positive transients while the other handles negative surges. For native bidirectional protection, Vishay's SMBJ12A-E3/52T (bidirectional, same VRWM) is a direct alternative - though it uses the larger DO-214AA package.
SMF12A-E3-08 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:
- General Purpose
- Capacitance @ Frequency:
- 483pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF12A-E3-08 FAQ
1.How can I place an order for SMF12A-E3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF12A-E3-08 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-E3-08 reliable?
The price and inventory of SMF12A-E3-08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF12A-E3-08 is usually 5 days.
3.What payment methods are accepted for SMF12A-E3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF12A-E3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF12A-E3-08?
SMF12A-E3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF12A-E3-08 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-E3-08?
For technical support, including SMF12A-E3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF12A-E3-08 requirements.
6.How does Aetrix verify that SMF12A-E3-08 is sourced from the original manufacturer or authorized distributors?
All SMF12A-E3-08 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-E3-08 meets industry standards.
7.What is the process for return or replacement of SMF12A-E3-08?
All SMF12A-E3-08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF12A-E3-08, 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-E3-08 part is unused and in its original packaging.
Return procedure for SMF12A-E3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF12A-E3-08 Tags
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