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Vishay General Semiconductor - Diodes Division SMF24A-M3-18
- Part No.:
- SMF24A-M3-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF24A-M3-18.pdf
- Description:
- TVS DIODE 24VWM 38.9VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:4,737
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Product details
Overview
SMF24A-M3-18 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in DO-219AB (SOD-123W) package, designed for low-capacitance transient voltage suppression on high-speed data lines. It features a 24 V stand-off voltage (VRWM), 26.7–29.6 V reverse breakdown (VBR), 5.1 A peak pulse current (IPPM), 38.9 V maximum clamping voltage (VC), and 244 pF typical capacitance at 0 V - optimized for USB 2.0, HDMI, and industrial sensor interfaces.
For engineers reviewing the SMF24A-M3-18 datasheet, SMF24A-M3-18 pinout, SMF24A-M3-18 application, or SMF24A-M3-18 equivalent, this device delivers verified ±30 kV IEC 61000-4-2 ESD immunity, AEC-Q101 qualification, and low-noise fast-response clamping for robust signal-line protection without signal integrity degradation.
Technical Context
This diode operates as a unidirectional TVS device with cathode-anode polarity, leveraging silicon avalanche technology to clamp transients above VRWM while maintaining sub-μA leakage (<0.1 μA at 24 V). Its low incremental surge resistance ensures stable clamping under repetitive 10/1000 μs pulses up to 200 W peak power.
The DO-219AB package enables high thermal dissipation (RthJA = 180 K/W on 3 mm × 3 mm Cu pads) and supports wave/reflow soldering per J-STD-020 MSL level 1, with peak reflow temperature ≤260 °C - critical for automotive and industrial PCB assembly reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 24 V - maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 24 V nominal bus lines. |
| Reverse Breakdown (VBR) | 26.7–29.6 V at 1 mA - guaranteed avalanche onset range; ensures consistent triggering across temperature and unit variance. |
| Clamping Voltage (VC) | 38.9 V at 5.1 A IPPM - peak voltage seen by protected circuit during worst-case 10/1000 μs surge; limits downstream IC stress. |
| Capacitance (CD) | 244 pF at 0 V, 1 MHz - low enough for USB 2.0 (480 Mbps) and CAN FD signal integrity; avoids excessive rise-time degradation. |
| ESD Rating | ±30 kV contact / ±30 kV air per IEC 61000-4-2 - exceeds Level 4 immunity requirements for industrial and automotive external ports. |
| Package | DO-219AB (SOD-123W) - 3.9 × 1.9 × 1.08 mm footprint compatible with standard SOD-123 pick-and-place tooling and reflow profiles. |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including HBM >8 kV and extended temperature operation (-65 °C to +175 °C). |
Pinout & Package
SMF24A-M3-18 uses the DO-219AB (SOD-123W) surface-mount package: 3.9 mm length, 1.9 mm width, 1.08 mm height, with cathode marked by a bar on the top surface. The device has two terminals in a single-diode configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or common return path; establishes clamping reference for positive transients on cathode side. |
| Cathode | Protected line input | Connected to I/O line (e.g., USB D+, HDMI TMDS+); conducts surge current to ground when voltage exceeds VRWM. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W Peak Pulse Power (10/1000 μs) | Enables reliable suppression of lightning-induced surges and system-level EFT events without thermal runaway. |
| "Low Noise" Fast Response Technology | Sub-nanosecond response time minimizes overshoot during ESD strikes, preserving signal fidelity on high-speed interfaces. |
| Low Incremental Surge Resistance | Ensures tight clamping voltage tolerance across current range - critical for protecting 3.3 V or 5 V logic rails behind series impedance. |
| Wave & Reflow Solderable | Compatible with standard PCB assembly processes including lead-free reflow (≤260 °C), eliminating manual post-solder handling. |
| UL 94 V-0 Molding Compound | Provides flame-retardant housing required for industrial and transportation end-equipment safety certifications. |
Applications
| USB 2.0 Interface Protection | HDMI Signal Line Protection |
|---|---|
Use Scenario: Protecting USB 2.0 D+ and D− lines against ESD events from human contact or cable coupling in portable medical devices. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed directly at connector, clamping transients before they reach USB transceiver IC. Use Value: 244 pF capacitance avoids signal rise-time distortion beyond USB 2.0 specification limits while delivering ±30 kV ESD immunity. | Use Scenario: Safeguarding HDMI TMDS differential pairs in digital signage controllers exposed to field service ESD events. IC Role / Device Role / Timing Role: Cathode-connected to TMDS+ and TMDS− lines, anode grounded; suppresses common-mode and differential transients. Use Value: 38.9 V clamping voltage prevents damage to HDMI PHY inputs rated for ≤4.5 V absolute max, via low-inductance layout. |
| Automotive Sensor Interface | Industrial RS-485 Transceiver Port |
Use Scenario: Protecting LIN or SENT bus lines in engine control modules where ambient temperature reaches +150 °C. IC Role / Device Role / Timing Role: Standoff-rated diode on bidirectional signal line, leveraging AEC-Q101 qualification and -65 °C to +175 °C operating range. Use Value: Stable 24 V VRWM ensures no false triggering during load-dump transients while maintaining <0.1 μA leakage at 125 °C. | Use Scenario: Shielding RS-485 transceivers in factory automation gateways connected to long, unshielded field wiring. IC Role / Device Role / Timing Role: Unidirectional TVS on A/B lines referenced to local ground, absorbing induced surges from nearby motor switching. Use Value: 200 W peak pulse power handles 1 kV/100 Ω surge test waveforms defined in IEC 61000-4-5 without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A-E3/57T | DO-214AC (SMA) package; 3.5 mm × 2.5 mm footprint; 400 W peak power; higher capacitance (350 pF). | Less suitable for >100 Mbps data lines due to higher parasitic capacitance; better for power-rail or lower-speed analog protection. | Select SMAJ24A-E3/57T only when board space allows larger package and signal bandwidth is ≤10 Mbps. |
| TPD2E001DRYR | 2-channel, 0.8 pF dual-diode array in USON-6; integrated ESD protection for high-speed USB/HDMI; not discrete. | Designed for ultra-high-speed interfaces (USB 3.0, DisplayPort); lacks standalone surge rating - requires upstream TVS for IEC 61000-4-5 compliance. | Choose TPD2E001DRYR when protecting multiple high-frequency lines in minimal area, but pair with SMF24A-M3-18 for full system-level surge immunity. |
Compared with SMAJ24A-E3/57T and TPD2E001DRYR, SMF24A-M3-18 uniquely balances low capacitance (244 pF), compact DO-219AB footprint, and full 200 W IEC 61000-4-5 surge capability - making it optimal for space-constrained industrial and automotive data-line protection where both ESD and surge must be addressed in one device.
Availability
SMF24A-M3-18 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, automotive sensor bus hardening, and industrial RS-485 port safeguarding requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant traceability.
Supply support for SMF24A-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 diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.
The SMF series targets high-speed signal-line ESD protection with AEC-Q101 qualification, low capacitance, and robust surge handling - engineered specifically for USB, HDMI, automotive LIN/Sent, and industrial communication interfaces.
FAQ
What is the maximum clamping voltage of the SMF24A-M3-18 under a 5.1 A 10/1000 μs surge?
The SMF24A-M3-18 has a maximum clamping voltage (VC) of 38.9 V when subjected to its rated 5.1 A peak pulse current with a 10/1000 μs waveform. This value is measured per IEC 61000-4-5 test conditions and ensures downstream ICs see limited overvoltage stress during surge events. The SMF24A-M3-18 maintains this clamping performance across its full operating temperature range.
Is the SMF24A-M3-18 suitable for protecting USB 2.0 data lines?
Yes, the SMF24A-M3-18 is suitable for USB 2.0 data line protection due to its 244 pF typical capacitance at 0 V and 1 MHz, which meets USB 2.0 signal integrity requirements for 480 Mbps operation. Its unidirectional configuration, 24 V VRWM, and ±30 kV IEC 61000-4-2 rating make it appropriate for D+ and D− line placement. The SMF24A-M3-18 also supports reflow soldering and fits standard SOD-123 pick-and-place workflows.
Does the SMF24A-M3-18 meet AEC-Q101 qualification standards?
Yes, the SMF24A-M3-18 is AEC-Q101 qualified, verified for automotive-grade reliability including human body model (HBM) ESD >8 kV, extended temperature operation from -65 °C to +175 °C, and mechanical robustness per the standard's stress tests. This qualification is documented in Vishay's official SMF series datasheet revision 2.4. The SMF24A-M3-18 is therefore approved for use in automotive infotainment, body control, and sensor modules.
What is the package type and dimensions of the SMF24A-M3-18?
The SMF24A-M3-18 uses the DO-219AB (also known as SOD-123W) surface-mount package, measuring 3.9 mm in length, 1.9 mm in width, and 1.08 mm in height. It features a cathode bar marking and is compatible with standard SOD-123 footprint layouts. The SMF24A-M3-18 is rated MSL level 1 and supports peak reflow temperatures up to 260 °C per J-STD-020.
How does the SMF24A-M3-18 compare to the SMF22A-M3-18 in terms of voltage ratings?
The SMF24A-M3-18 has a 24 V stand-off voltage (VRWM) and 26.7–29.6 V reverse breakdown (VBR), whereas the SMF22A-M3-18 specifies 22 V VRWM and 24.4–27.0 V VBR. This 2 V higher standoff makes the SMF24A-M3-18 better suited for 24 V nominal systems or applications requiring greater margin against normal-mode voltage fluctuations. Both share identical package, capacitance, and surge ratings - the SMF24A-M3-18 is not a drop-in replacement for SMF22A-M3-18 without circuit review.
SMF24A-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):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 5.1A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 244pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF24A-M3-18 FAQ
1.How can I place an order for SMF24A-M3-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF24A-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 SMF24A-M3-18 reliable?
The price and inventory of SMF24A-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 SMF24A-M3-18 is usually 5 days.
3.What payment methods are accepted for SMF24A-M3-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF24A-M3-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF24A-M3-18?
SMF24A-M3-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF24A-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 SMF24A-M3-18?
For technical support, including SMF24A-M3-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF24A-M3-18 requirements.
6.How does Aetrix verify that SMF24A-M3-18 is sourced from the original manufacturer or authorized distributors?
All SMF24A-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 SMF24A-M3-18 meets industry standards.
7.What is the process for return or replacement of SMF24A-M3-18?
All SMF24A-M3-18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF24A-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 SMF24A-M3-18 part is unused and in its original packaging.
Return procedure for SMF24A-M3-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF24A-M3-18 Tags
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