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Vishay General Semiconductor - Diodes Division SMF24A-M3-08
- Part No.:
- SMF24A-M3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF24A-M3-08.pdf
- Description:
- TVS DIODE 24VWM 38.9VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:51,940
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Product details
Overview
SMF24A-M3-08 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in DO-219AB (SOD-123W) package, designed for low-capacitance transient 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) at IPPM, and 244 pF typical junction capacitance at 0 V.
For engineers reviewing the SMF24A-M3-08 datasheet, SMF24A-M3-08 pinout, SMF24A-M3-08 application, or SMF24A-M3-08 equivalent, this device is selected for robust ±30 kV IEC 61000-4-2 ESD protection in automotive infotainment interfaces, USB 2.0 signal lines, and industrial sensor I/O where low clamping voltage and sub-1 ns response time are critical.
Technical Context
This diode operates as a unidirectional avalanche clamp, leveraging silicon planar technology to deliver fast response (<1 ns) and low incremental surge resistance. Its 24 V VRWM enables use on 24 V nominal power rails or 18–28 V industrial control buses without leakage-induced false triggering.
The DO-219AB package supports wave and reflow soldering with MSL level 1 rating and 260 °C peak temperature tolerance. Thermal resistance (RthJA) is 180 K/W when mounted on 3 mm × 3 mm Cu pads - enabling reliable operation up to TJ = 175 °C in compact, thermally constrained layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 24 V - blocks normal operating voltage while remaining non-conductive until transients exceed threshold |
| Reverse Breakdown (VBR) | 26.7–29.6 V at 1 mA - defines precise avalanche initiation range for predictable clamping onset |
| Clamping Voltage (VC) | 38.9 V max at 5.1 A (10/1000 μs) - limits downstream IC stress during ESD events |
| Junction Capacitance | 244 pF at 0 V, 1 MHz - preserves signal integrity on moderate-speed digital lines (e.g., CAN, RS-485) |
| ESD Rating | ±30 kV contact / ±30 kV air per IEC 61000-4-2 - exceeds automotive and industrial immunity requirements |
| Peak Pulse Power | 200 W (10/1000 μs) - sustains short-duration surges without degradation |
| Operating Temperature | −65 °C to +175 °C - supports under-hood and industrial ambient conditions |
Pinout & Package
SMF24A-M3-08 uses the DO-219AB (SOD-123W) package: 3.9 mm × 1.9 mm × 1.08 mm, cathode-marked with a bar, compatible with standard SOD-123 footprint. Mold compound meets UL 94 V-0; MSL level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side | Connected to protected signal or power line; conducts transient current toward ground during overvoltage |
| Cathode | Ground reference | Connected to system ground plane; establishes clamping reference and enables unidirectional protection |
Key Features
| Feature | Design Value |
|---|---|
| Low-clamp architecture | 38.9 V VC at 5.1 A ensures <12 V margin below typical 50 V IC absolute maximum ratings |
| "Low Noise" fast response | Sub-1 ns turn-on minimizes voltage overshoot before clamping engages |
| AEC-Q101 qualified option | Available in AEC-Q101 grade (e.g., SMF24A-HE3_A08) for automotive-grade reliability validation |
| Reflow/wave solder compatible | Rated for peak temperatures up to 260 °C - eliminates hand-soldering dependency in production |
| Low-profile SMD form factor | 1.08 mm height enables placement beneath connectors or in dense PCB areas |
Applications
| Automotive Infotainment Display Interface | Industrial RS-485 Transceiver Protection |
|---|---|
Use Scenario: Protecting LVDS or FPD-Link III video data lines between head unit and display panel against ESD during assembly and field operation. IC Role / Device Role: Unidirectional transient voltage suppressor placed directly at connector entry point. Use Value: 244 pF capacitance avoids signal rise-time degradation on 100+ Mbps links; ±30 kV ESD rating prevents latch-up in display timing controllers. |
Use Scenario: Safeguarding RS-485 transceivers (e.g., SN65HVD230) on factory floor communication nodes exposed to cable-handling ESD. IC Role / Device Role: Line-side TVS diode on A/B differential pair, referenced to local ground. Use Value: 38.9 V clamping ensures transceiver common-mode range (−7 V to +12 V) remains undisturbed during 4 kV contact discharge events. |
| 24 V Industrial Sensor I/O Protection | USB 2.0 Data Line ESD Suppression |
Use Scenario: Shielding analog/digital outputs of pressure or temperature sensors powered from 24 V DC supply rails in harsh plant environments. IC Role / Device Role: Stand-off-rated TVS on sensor output line, positioned after series current-limiting resistor. Use Value: 24 V VRWM matches supply rail exactly - eliminates standby leakage while enabling full 24 V operational headroom. |
Use Scenario: Adding secondary ESD protection on D+ and D− lines downstream of integrated USB port ESD structures. IC Role / Device Role: Low-capacitance unidirectional clamp tied to USB PHY ground, minimizing signal distortion. Use Value: 244 pF capacitance adds <0.5% jitter to 480 Mbps USB 2.0 eye diagram - within USB-IF compliance margin. |
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; higher RthJA (200 K/W); 400 pF capacitance | Less suitable for high-speed data lines due to higher capacitance and larger footprint | Select when board space allows larger package and lower-cost procurement is prioritized over signal integrity |
| TPD2E001DRYR | Bi-directional dual-channel array; 10 pF/channel; 5 V VRWM; not rated for 24 V systems | Designed for 3.3 V/5 V USB/HDMI; incompatible with 24 V rail protection | Choose only for low-voltage, high-speed interfaces requiring ultra-low capacitance - not a functional replacement for SMF24A-M3-08 |
Compared with SMAJ24A-E3/57T and TPD2E001DRYR, SMF24A-M3-08 uniquely balances 24 V system compatibility, 244 pF capacitance, and DO-219AB's low-profile manufacturability - making it optimal for space-constrained 24 V industrial and automotive signal protection where both voltage rating and speed matter.
Availability
SMF24A-M3-08 is available at Aetrix Electronics and suitable for automotive infotainment interfaces, industrial RS-485 networks, and 24 V sensor I/O requiring stable component supply across long-lifecycle programs.
Supply support for SMF24A-M3-08 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, and optoelectronics for automotive, industrial, and computing markets.
The SMF series targets cost-sensitive, high-volume ESD protection needs in automotive and industrial applications - delivering AEC-Q101-qualified robustness in compact, solder-reflow-compatible packages.
FAQ
What is the maximum clamping voltage of SMF24A-M3-08 under standard test conditions?
The SMF24A-M3-08 has a maximum clamping voltage (VC) of 38.9 V when subjected to a 10/1000 μs waveform at its rated peak pulse current of 5.1 A. This value is measured per IEC 61000-4-5 and ensures protected circuitry remains within safe voltage margins during surge events. The clamping performance is guaranteed across the full operating temperature range of −65 °C to +175 °C.
Is SMF24A-M3-08 unidirectional or bidirectional, and how does that affect circuit design?
SMF24A-M3-08 is a unidirectional ESD protection diode, meaning it conducts only when the cathode is more positive than the anode - ideal for protecting DC-biased lines like 24 V power rails or single-ended signals referenced to ground. Its unidirectional nature requires correct orientation during layout: anode to line, cathode to ground. Bidirectional variants (e.g., SMF24CA) would be needed for AC-coupled or floating differential lines.
Does SMF24A-M3-08 meet AEC-Q101 qualification standards?
The base SMF24A-M3-08 part is RoHS-compliant and manufactured to Vishay's eSMP® quality standards, but AEC-Q101 qualification applies specifically to variants marked with "H" in the ordering code (e.g., SMF24A-HE3_A08). Engineers requiring automotive-grade validation must specify the AEC-Q101 version - the -M3-08 suffix alone denotes tape-and-reel packaging, not qualification status.
What is the thermal resistance (RthJA) of SMF24A-M3-08, and how should it guide PCB layout?
SMF24A-M3-08 has a junction-to-ambient thermal resistance (RthJA) of 180 K/W when mounted on a standard epoxy-glass PCB with 3 mm × 3 mm copper pads ≥40 μm thick. To maintain safe junction temperatures under repeated surge conditions, designers should replicate this pad area and avoid excessive thermal isolation - especially in high-temperature environments exceeding 85 °C ambient.
Can SMF24A-M3-08 be used to protect USB 2.0 data lines, and what layout considerations apply?
Yes, SMF24A-M3-08 can protect USB 2.0 D+ and D− lines when implemented as a pair (one per line), provided the host/device PHY supports 24 V common-mode tolerance. Its 244 pF capacitance is acceptable for USB 2.0 (480 Mbps) if placed close to the connector with minimal trace length (<5 mm) and no stubs - ensuring added jitter stays within USB-IF specification limits. Ground return path inductance must also be minimized.
SMF24A-M3-08 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):
- 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-M3-08 FAQ
1.How can I place an order for SMF24A-M3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF24A-M3-08 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 SMF24A-M3-08 reliable?
The price and inventory of SMF24A-M3-08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF24A-M3-08 is usually 5 days.
3.What payment methods are accepted for SMF24A-M3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF24A-M3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF24A-M3-08?
SMF24A-M3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF24A-M3-08 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 SMF24A-M3-08?
For technical support, including SMF24A-M3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF24A-M3-08 requirements.
6.How does Aetrix verify that SMF24A-M3-08 is sourced from the original manufacturer or authorized distributors?
All SMF24A-M3-08 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 SMF24A-M3-08 meets industry standards.
7.What is the process for return or replacement of SMF24A-M3-08?
All SMF24A-M3-08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF24A-M3-08, 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 SMF24A-M3-08 part is unused and in its original packaging.
Return procedure for SMF24A-M3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF24A-M3-08 Tags
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