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Vishay General Semiconductor - Diodes Division SMF14A-M3-18
- Part No.:
- SMF14A-M3-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF14A-M3-18.pdf
- Description:
- TVS DIODE 14VWM 23.2VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:7,793
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Product details
Overview
SMF14A-M3-18 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in the SMF (DO-219AB) package, designed for transient voltage suppression on I/O lines and power rails. It features a 14 V standoff voltage (VRWM), 23.2 V maximum clamping voltage at 8.6 A peak pulse current, 392 pF typical capacitance at 0 V, ±30 kV IEC 61000-4-2 ESD immunity, and 200 W peak pulse power (10/1000 μs).
For engineers reviewing the SMF14A-M3-18 datasheet, SMF14A-M3-18 pinout, SMF14A-M3-18 application, or SMF14A-M3-18 equivalent, this device is selected for high-reliability ESD protection in automotive infotainment interfaces, industrial sensor signal conditioning, and USB 2.0 data line surge suppression where low clamping voltage and fast response are critical.
Technical Context
The SMF14A-M3-18 operates as a unidirectional TVS diode with avalanche breakdown behavior, optimized for clamping transients before downstream ICs reach damage thresholds. Its junction temperature range spans −65 °C to +175 °C, and it achieves thermal resistance of 180 K/W when mounted on standard 3 mm × 3 mm Cu pads.
It delivers 200 W peak pulse power under 10/1000 μs waveform conditions and supports 50 A non-repetitive forward surge current (8.3 ms half-sine). The device meets AEC-Q101 qualification for automotive-grade reliability and exhibits <0.1 μA reverse leakage at VRWM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 14 V - Maximum continuous reverse operating voltage before significant leakage begins; defines safe working margin for 12 V nominal systems. |
| Clamping Voltage (VC) | 23.2 V max at IPPM = 8.6 A - Limits transient voltage seen by protected ICs during 10/1000 μs surges. |
| Peak Pulse Power (PPP) | 200 W (10/1000 μs) - Sustains short-duration energy bursts without degradation; suitable for IEC 61000-4-5 Level 2 compliance. |
| Capacitance (CD) | 392 pF at 0 V, 1 MHz - Low enough for USB 2.0 (480 Mbps) signal integrity but not for high-speed differential interfaces like HDMI or PCIe. |
| ESD Rating | ±30 kV contact / ±30 kV air per IEC 61000-4-2 - Exceeds industrial and automotive ESD immunity requirements for exposed connectors. |
| Reverse Leakage (IR) | 0.1 μA max at VRWM - Ensures minimal standby power loss and signal distortion in high-impedance analog paths. |
| Package | DO-219AB (SOD-123W-compatible) - 3.9 mm × 1.9 mm × 1.08 mm low-profile outline enabling dense PCB layouts and automated reflow assembly. |
Pinout & Package
SMF14A-M3-18 uses the DO-219AB (SMF) package: a two-terminal, cathode-marked surface-mount device with a molded epoxy body and gull-wing leads. Cathode identification is via a bar marking on the top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current sink path during positive surges | Connected to protected line (e.g., USB D+); conducts surge current to ground when voltage exceeds VRWM. |
| Cathode | Reference node tied to system ground or common return | Provides low-impedance path to GND during clamping; must be routed with minimal inductance for effective ESD suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Low clamping voltage | 23.2 V max at 8.6 A ensures protected ICs remain below absolute maximum ratings during 10/1000 μs transients. |
| AEC-Q101 qualified | Validated for automotive applications including infotainment, body control modules, and ADAS sensor interfaces. |
| "Low Noise" fast response | Sub-nanosecond turn-on enables suppression before ESD pulses propagate into sensitive analog or digital circuitry. |
| SOD-123W footprint compatibility | Enables drop-in replacement or layout reuse with legacy SOD-123W designs without board redesign. |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow profiles up to 260 °C peak, simplifying manufacturing logistics. |
Applications
| Automotive Infotainment Interface | Industrial Sensor Signal Line |
|---|---|
|
Use Scenario: Protecting USB 2.0 data lines (D+/D−) in head unit docking ports against ESD events during cable insertion. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between signal line and chassis ground to clamp transients before reaching USB transceiver IC. Use Value: 392 pF capacitance preserves signal integrity at 480 Mbps while ±30 kV ESD rating prevents field failures in service environments. |
Use Scenario: Shielding 4–20 mA current loop inputs in PLC analog input modules from induced surges on factory floor wiring. IC Role / Device Role / Timing Role: Standoff-rated transient suppressor across input terminals to limit voltage excursion during lightning-induced transients. Use Value: 14 V VRWM aligns with loop supply headroom; 23.2 V clamping prevents op-amp input stage damage during 1 kV/μs surges. |
| Consumer Audio Jack Protection | Automotive CAN FD Data Line |
|
Use Scenario: Guarding 3.5 mm audio jack mic/line-in pins in portable speakers against user-hand ESD during plug insertion. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional diode (cathode grounded) suppressing both positive and negative transients on single-ended analog lines. Use Value: Low 0.1 μA leakage avoids DC offset in bias-sensitive preamp stages; 200 W pulse rating handles repeated human-body-model discharges. |
Use Scenario: Supplementing primary CAN FD transceiver ESD protection on vehicle door module data lines exposed to harness-level transients. IC Role / Device Role / Timing Role: Secondary clamping device placed upstream of transceiver to reduce stress on integrated protection diodes. Use Value: 175 °C max junction temperature supports under-hood placement; AEC-Q101 qualification ensures long-term reliability in vibration-prone environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ14A-E3/57T | Same VRWM (14 V) and VC (23.2 V), but SMA package (DO-214AC) - larger footprint (4.5 mm × 2.7 mm) and higher thermal resistance (200 K/W). | Less suitable for ultra-dense layouts; better for higher-power dissipation scenarios requiring larger copper pour. | Select SMAJ14A-E3/57T only if board space allows larger package and thermal design accommodates higher RthJA. |
| TPSMF14A | Identical electrical specs and DO-219AB package, but manufactured by STMicroelectronics; same 392 pF capacitance and ±30 kV ESD rating. | No functional or mechanical difference - fully interchangeable in existing designs with verified sourcing. | TPSMF14A offers dual-source assurance for long-term supply continuity without layout or performance trade-offs. |
Compared with SMAJ14A-E3/57T, SMF14A-M3-18 saves 30% board area and improves thermal coupling; versus TPSMF14A, it provides identical performance with Vishay-specific AEC-Q101 test reporting and traceable lot documentation.
Availability
SMF14A-M3-18 is available at Aetrix Electronics and suitable for automotive infotainment interfaces, industrial sensor signal conditioning, and USB 2.0 data line surge suppression requiring stable component supply and long-term lifecycle support.
Supply support for SMF14A-M3-18 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 passive and protection components for automotive, industrial, and computing markets.
The SMF series targets compact, high-performance ESD protection for space-constrained, high-reliability applications - particularly where AEC-Q101 qualification, low clamping, and reflow-compatible packaging are mandatory.
FAQ
What is the maximum clamping voltage of the SMF14A-M3-18 under standard test conditions?
The SMF14A-M3-18 has a maximum reverse clamping voltage (VC) of 23.2 V when subjected to an 8.6 A peak pulse current with a 10/1000 μs waveform. This value is measured per IEC 61000-4-5 and ensures downstream ICs remain within safe operating limits during surge events. The SMF14A-M3-18 maintains this clamping performance across its full operating temperature range of −65 °C to +175 °C.
Is the SMF14A-M3-18 suitable for USB 2.0 data line protection?
Yes, the SMF14A-M3-18 is suitable for USB 2.0 data line protection due to its 392 pF typical capacitance at 0 V and 1 MHz, which introduces negligible signal distortion at 480 Mbps data rates. Its 14 V standoff voltage provides adequate margin above the 3.3 V logic level, and its ±30 kV IEC 61000-4-2 rating covers real-world ESD threats. The SMF14A-M3-18 must be placed close to the connector with short, low-inductance ground paths for optimal performance.
Does the SMF14A-M3-18 meet AEC-Q101 qualification standards?
Yes, the SMF14A-M3-18 is AEC-Q101 qualified for automotive applications, covering stress tests including HBM (>8 kV), temperature cycling, and high-temperature operating life. This qualification confirms suitability for under-hood and cabin-mounted modules where reliability under thermal, mechanical, and electrical stress is critical. The SMF14A-M3-18's 175 °C maximum junction temperature further supports operation in demanding automotive environments.
What is the package type and dimensions of the SMF14A-M3-18?
The SMF14A-M3-18 uses the DO-219AB (SMF) package: 3.9 mm length × 1.9 mm width × 1.08 mm height, with gull-wing leads and cathode bar marking. It is compatible with SOD-123W footprint layouts and rated MSL Level 1 for unlimited floor life. The package supports wave and reflow soldering, with peak reflow temperature up to 260 °C, making it compatible with standard lead-free assembly processes.
How does the SMF14A-M3-18 compare to the SMF15A in terms of standoff voltage and application fit?
The SMF14A-M3-18 has a 14 V standoff voltage (VRWM), while the SMF15A specifies 15 V - a 1 V difference that determines compatibility with specific rail voltages. For 12 V nominal systems with tight tolerance margins, SMF14A-M3-18 provides safer headroom; SMF15A suits 13.5 V–15 V supplies. Both share identical package, clamping, and ESD ratings, so selection depends strictly on system voltage alignment - the SMF14A-M3-18 is not a direct substitute for SMF15A without verifying VRWM margin in the target application.
SMF14A-M3-18 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):
- 14V
- Voltage - Breakdown (Min):
- 15.6V
- Voltage - Clamping (Max) @ Ipp:
- 23.2V
- Current - Peak Pulse (10/1000µs):
- 8.6A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 392pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF14A-M3-18 FAQ
1.How can I place an order for SMF14A-M3-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF14A-M3-18 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 SMF14A-M3-18 reliable?
The price and inventory of SMF14A-M3-18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF14A-M3-18 is usually 5 days.
3.What payment methods are accepted for SMF14A-M3-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF14A-M3-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF14A-M3-18?
SMF14A-M3-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF14A-M3-18 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 SMF14A-M3-18?
For technical support, including SMF14A-M3-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF14A-M3-18 requirements.
6.How does Aetrix verify that SMF14A-M3-18 is sourced from the original manufacturer or authorized distributors?
All SMF14A-M3-18 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 SMF14A-M3-18 meets industry standards.
7.What is the process for return or replacement of SMF14A-M3-18?
All SMF14A-M3-18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF14A-M3-18, 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 SMF14A-M3-18 part is unused and in its original packaging.
Return procedure for SMF14A-M3-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF14A-M3-18 Tags
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