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Vishay SMF24A-HM3_A18
- Part No.:
- SMF24A-HM3_A18
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF24A-HM3_A18.pdf
- Description:
- ESD PROTECTION DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,907
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Product details
Overview
SMF24A-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 and power rails. It features a 24 V stand-off voltage (VRWM), 38.9 V maximum clamping voltage at 5.1 A peak pulse current, 200 W peak pulse power (10/1000 μs), ±30 kV IEC 61000-4-2 ESD immunity, and 244 pF typical capacitance at 0 V - ideal for USB 2.0, HDMI, and automotive infotainment interfaces.
For engineers reviewing the SMF24A-HM3_A18 datasheet, SMF24A-HM3_A18 pinout, SMF24A-HM3_A18 application, or SMF24A-HM3_A18 equivalent, this device is selected for robust electrostatic discharge protection where low clamping voltage, fast response time, and AEC-Q101 qualification are required in space-constrained PCB layouts.
Technical Context
This unidirectional TVS diode operates as a shunt-type transient suppressor, conducting above its reverse breakdown voltage (26.7–29.6 V) to clamp overvoltage transients while maintaining low leakage (<0.1 μA at 24 V). Its "Low Noise" technology ensures sub-nanosecond response time, critical for protecting high-bandwidth analog and digital signal paths.
The device complies with AEC-Q101 for automotive applications and meets IEC 61000-4-2 (±30 kV contact/air) and IEC 61000-4-5 (1000 W, 8/20 μs) surge standards. Thermal resistance is 180 K/W when mounted on a 3 mm × 3 mm Cu pad, supporting reliable operation up to 175 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 24 V - maximum continuous reverse operating voltage before conduction begins; defines safe operating margin for 24 V nominal systems. |
| Clamping Voltage (VC) | 38.9 V at IPPM = 5.1 A (10/1000 μs) - limits transient voltage seen by protected ICs to safe levels during surge events. |
| Peak Pulse Power | 200 W (10/1000 μs) - sustains short-duration surges without failure; sufficient for most board-level ESD and lightning-induced transients. |
| ESD Immunity | ±30 kV contact / ±30 kV air per IEC 61000-4-2 - exceeds industrial and automotive ESD test requirements. |
| Capacitance (CD) | 244 pF at 0 V, 1 MHz - low enough for USB 2.0 (480 Mbps) and CAN FD signal integrity, but not suitable for PCIe Gen3+. |
| AEC-Q101 Qualified | Yes - validated for automotive underhood and cabin applications requiring extended temperature (-65 °C to +175 °C) and reliability screening. |
| Package | DO-219AB (SOD-123W-compatible) - 3.9 mm × 1.9 mm × 1.08 mm low-profile outline enabling dense routing and automated assembly. |
Pinout & Package
SMF24A-HM3_A18 uses the DO-219AB (SMF) package: a two-terminal, surface-mount, unidirectional TVS diode with cathode marked by a bar. The package is compatible with SOD-123W footprint and supports wave/reflow soldering per J-STD-020 MSL level 1 (peak 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path | Connected to ground or low-impedance reference; completes clamping loop during overvoltage events. |
| Cathode | Protected line connection | Connected to signal/power line being protected; conducts when line voltage exceeds VRWM relative to anode. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Enables robust protection against repetitive ESD and surge events without thermal runaway in compact layouts. |
| ±30 kV IEC 61000-4-2 ESD immunity | Meets highest industrial and automotive ESD stress levels, eliminating need for external staging networks in many designs. |
| 244 pF capacitance at 0 V | Preserves signal integrity for medium-speed interfaces (e.g., USB 2.0, CAN, RS-485) without excessive rise-time degradation. |
| AEC-Q101 qualification | Validates reliability for automotive electronics including body control modules, infotainment, and ADAS sensor interfaces. |
| Low-profile DO-219AB package | Reduces PCB real estate and improves mechanical stability vs. larger DO-214 packages, supporting miniaturized automotive ECUs. |
Applications
| USB 2.0 Interface Protection | Automotive Infotainment Display Port |
|---|---|
Use Scenario: Protecting D+ and D− lines of USB 2.0 ports against ESD events during hot-plug insertion in industrial HMIs and vehicle docking stations. IC Role / Device Role: Unidirectional shunt TVS diode placed between each data line and chassis ground. Use Value: Clamps transients to ≤38.9 V within nanoseconds, preventing damage to USB transceivers while maintaining <480 Mbps signal fidelity via 244 pF capacitance. |
Use Scenario: Safeguarding LVDS or FPD-Link video signal pairs connecting head unit processors to TFT displays in vehicles. IC Role / Device Role: Line-to-ground TVS on each differential pair, leveraging AEC-Q101 qualification for under-dash mounting. Use Value: Withstands repeated ±30 kV ESD strikes and operates reliably across -40 °C to +105 °C ambient, ensuring display uptime in harsh automotive environments. |
| Industrial CAN Bus Node | 24 V Power Rail Surge Suppression |
Use Scenario: Protecting CAN_H and CAN_L pins of microcontrollers and transceivers in factory automation controllers exposed to cable discharge events. IC Role / Device Role: Bidirectional protection implemented using two SMF24A-HM3_A18 devices (anode-to-anode configuration). Use Value: Provides symmetrical clamping (38.9 V) with low leakage (<0.1 μA), preserving bus biasing and dominant/recessive voltage margins per ISO 11898. |
Use Scenario: Suppressing load dump and jump-start transients on 24 V supply inputs of telematics modules and ADAS ECUs. IC Role / Device Role: Cathode-to-rail, anode-to-ground configuration on main power entry point. Use Value: Handles 50 A surge current (IFSM) and clamps 10/1000 μs surges to 38.9 V, preventing brownout or latch-up in downstream PMICs and MCUs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SP1003-02UTG | 24 V VRWM, 33 V VC @ 5 A, 150 pF - lower capacitance but 30% lower clamping voltage. | Better suited for higher-speed interfaces (e.g., USB 3.0 SS lines); lacks AEC-Q101 qualification. | Select when signal bandwidth >1 GHz is required and automotive qualification is not mandatory. |
| ON Semiconductor SZ1.5SMC24A | 24 V VRWM, 38.9 V VC @ 38.9 A, 1000 W (8/20 μs), 1100 pF - higher power rating but 4.5× higher capacitance. | Designed for bulk power rail protection (e.g., 24 V input), not signal-line use due to excessive capacitance. | Choose only for primary DC input protection where layout space allows larger SMC package and signal speed is not constrained. |
Compared with SP1003-02UTG and SZ1.5SMC24A, SMF24A-HM3_A18 uniquely balances low capacitance (244 pF), automotive qualification, and compact DO-219AB packaging - making it optimal for space-limited, high-reliability signal-line protection where both ESD robustness and signal fidelity matter.
Availability
SMF24A-HM3_A18 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial USB host interfaces, and 24 V CAN node designs requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMF24A-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 semiconductor manufacturer specializing in discrete components, sensors, and passive elements, with leadership in power management, signal conditioning, and protection technologies.
The SMF series is part of Vishay's eSMP® family of surface-mount TVS diodes, engineered specifically for high-reliability ESD and surge protection in automotive, industrial, and communications equipment where small size and AEC-Q101 compliance are essential.
FAQ
What is the reverse standoff voltage (VRWM) of the SMF24A-HM3_A18?
The SMF24A-HM3_A18 has a maximum reverse standoff voltage (VRWM) of 24 V, meaning it remains non-conductive under normal operating conditions up to this voltage. This value is confirmed in the Electrical Characteristics table of Vishay's Document Number 85881, Rev. 2.4, and ensures compatibility with 24 V nominal systems such as automotive body electronics and industrial PLC I/O modules. The SMF24A-HM3_A18 maintains leakage current below 0.1 μA at this voltage.
Does the SMF24A-HM3_A18 meet automotive qualification standards?
Yes, the SMF24A-HM3_A18 is AEC-Q101 qualified, as explicitly stated in Vishay's SMF5V0A to SMF58A datasheet (Rev. 2.4, July 2023). This qualification covers stress tests including high-temperature operating life, temperature cycling, and ESD, validating its suitability for automotive applications such as infotainment, ADAS camera links, and gateway ECUs. The SMF24A-HM3_A18 operates across -65 °C to +175 °C junction temperature.
What is the clamping voltage of the SMF24A-HM3_A18 at its rated peak pulse current?
The SMF24A-HM3_A18 exhibits a maximum clamping voltage (VC) of 38.9 V at a peak pulse current (IPPM) of 5.1 A with a 10/1000 μs waveform, per the Electrical Characteristics table in Vishay's official documentation. This clamping performance ensures downstream ICs see limited overvoltage during transient events. The SMF24A-HM3_A18 achieves this with low incremental surge resistance and fast response enabled by its "Low Noise" silicon process.
Can the SMF24A-HM3_A18 be used for bidirectional protection?
The SMF24A-HM3_A18 is a unidirectional TVS diode, but it can be configured for bidirectional protection by connecting two units anode-to-anode. This arrangement provides symmetrical clamping for differential buses like CAN or RS-485, with each SMF24A-HM3_A18 handling one polarity. The datasheet confirms this topology is supported, and the resulting clamping voltage remains ≤38.9 V per leg under defined test conditions.
What is the package type and footprint compatibility of the SMF24A-HM3_A18?
The SMF24A-HM3_A18 uses the DO-219AB (SMF) package: 3.9 mm × 1.9 mm × 1.08 mm with a cathode bar marking. It is mechanically and soldering-process compatible with the SOD-123W footprint, as confirmed in Vishay's Package Data section. The SMF24A-HM3_A18 supports reflow soldering up to 260 °C (MSL level 1) and is optimized for high-density PCB layouts in automotive and industrial modules.
SMF24A-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):
- 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:
- -
- Capacitance @ Frequency:
- 244pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF24A-HM3_A18 FAQ
1.How can I place an order for SMF24A-HM3_A18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF24A-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 SMF24A-HM3_A18 reliable?
The price and inventory of SMF24A-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 SMF24A-HM3_A18 is usually 5 days.
3.What payment methods are accepted for SMF24A-HM3_A18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF24A-HM3_A18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF24A-HM3_A18?
SMF24A-HM3_A18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF24A-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 SMF24A-HM3_A18?
For technical support, including SMF24A-HM3_A18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF24A-HM3_A18 requirements.
6.How does Aetrix verify that SMF24A-HM3_A18 is sourced from the original manufacturer or authorized distributors?
All SMF24A-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 SMF24A-HM3_A18 meets industry standards.
7.What is the process for return or replacement of SMF24A-HM3_A18?
All SMF24A-HM3_A18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF24A-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 SMF24A-HM3_A18 part is unused and in its original packaging.
Return procedure for SMF24A-HM3_A18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF24A-HM3_A18 Tags
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