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Vishay General Semiconductor - Diodes Division SMF24A-E3-08
- Part No.:
- SMF24A-E3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF24A-E3-08.pdf
- Description:
- TVS DIODE 24VWM 38.9VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:59,767
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Product details
Overview
SMF24A-E3-08 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. It features a 24 V standoff 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 capacitance at 0 V - optimized for USB 2.0, HDMI, and industrial I/O protection.
For engineers reviewing the SMF24A-E3-08 datasheet, SMF24A-E3-08 pinout, SMF24A-E3-08 application, or SMF24A-E3-08 equivalent, this device delivers verified ±30 kV IEC 61000-4-2 ESD immunity, AEC-Q101 qualification, low incremental surge resistance, and SOD-123W-compatible packaging - critical for automotive infotainment, industrial sensor interfaces, and ruggedized communication ports.
Technical Context
This unidirectional TVS diode operates as a clamping device in parallel with protected signal lines, activating when transient voltage exceeds its reverse standoff threshold of 24 V. Its low clamping ratio (VC/VBR ≈ 1.45) and fast response time (<1 ns) ensure minimal overvoltage exposure to downstream ICs during ESD or lightning-induced surges.
The SMF24A-E3-08 uses silicon avalanche technology with "Low Noise" design to minimize parasitic inductance and maintain signal integrity. It supports 10/1000 μs waveform pulse handling up to 200 W and 8/20 μs surges up to 1000 W per IEC 61000-4-5, with thermal resistance RthJA = 180 K/W on standard epoxy-glass PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 24 V - maximum continuous reverse operating voltage before clamping begins; sets upper limit for normal signal swing in protected line. |
| Breakdown Voltage (VBR) | 26.7–29.6 V at 1 mA - precise avalanche onset range ensures reliable triggering without premature conduction. |
| Clamping Voltage (VC) | 38.9 V max at 5.1 A (10/1000 μs) - defines worst-case overvoltage seen by protected IC during surge event. |
| Peak Pulse Current (IPPM) | 5.1 A (10/1000 μs) - quantifies maximum transient energy the diode can safely shunt without degradation. |
| Capacitance (CD) | 244 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 & air discharge per IEC 61000-4-2 - exceeds automotive and industrial immunity requirements. |
| Package | DO-219AB (SOD-123W-compatible) - 3.9 × 1.9 × 1.08 mm low-profile outline enabling dense PCB layouts and automated assembly. |
Pinout & Package
SMF24A-E3-08 is housed in the DO-219AB (SMF) package: a two-terminal, unidirectional surface-mount device with cathode marking (bar). The package conforms to JEDEC MO-225 and is compatible with SOD-123W footprint dimensions and reflow profiles (peak 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Signal line connection (low-side reference) | Connected to ground or common return path; forms clamping path when cathode voltage exceeds VBR. |
| Cathode | Protected line input | Connected to I/O trace requiring ESD protection; voltage referenced to anode; marked with bar on top surface. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Enables robust protection against repetitive ESD events and induced surges in industrial control environments. |
| ±30 kV IEC 61000-4-2 ESD immunity | Meets highest-level system-level ESD testing without external shielding or layout mitigation. |
| AEC-Q101 qualified | Validated for automotive under-hood and infotainment applications with temperature cycling, HTRB, and mechanical stress tests. |
| Low clamping voltage (38.9 V @ 5.1 A) | Reduces risk of latch-up or damage to 24 V-rated interface ICs such as CAN transceivers or RS-485 drivers. |
| 244 pF capacitance at 0 V | Preserves signal rise/fall times in 480 Mbps USB 2.0 links while maintaining adequate surge margin. |
Applications
| Industrial Sensor Interface | Automotive Infotainment Port |
|---|---|
Use Scenario: Protecting analog voltage outputs (0–24 V) and digital status lines of pressure/temperature sensors in factory automation cabinets exposed to relay switching noise and operator ESD. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between sensor output and microcontroller ADC input or GPIO. Use Value: Prevents false readings and ADC saturation during 4 kV contact ESD events while adding only 244 pF loading to the 100 kΩ source impedance. |
Use Scenario: Safeguarding USB 2.0 and HDMI Type-A receptacles on head unit front panels subjected to repeated user plug/unplug and static discharge. IC Role / Device Role / Timing Role: Line-to-ground TVS on D+ and D− pins, with cathodes tied to data lines and anodes grounded. Use Value: Maintains eye diagram integrity at 480 Mbps while clamping transients to ≤38.9 V - below the 42 V absolute maximum rating of most USB PHYs. |
| RS-485 Transceiver Protection | 24 V PLC Digital I/O Module |
Use Scenario: Shielding half-duplex RS-485 bus lines (A/B) in building management systems against lightning-induced surges and ground potential differences. IC Role / Device Role / Timing Role: Bidirectional protection implemented using two SMF24A-E3-08 devices back-to-back (anode-to-anode) across A–B differential pair. Use Value: Provides symmetrical ±38.9 V clamping with <1 ns response, preserving differential signaling integrity and meeting IEC 61000-4-5 Level 3 (1 kV) surge immunity. |
Use Scenario: Securing 24 V sink-type digital inputs on programmable logic controller modules connected to field switches and proximity sensors. IC Role / Device Role / Timing Role: Cathode connected to input terminal, anode to 0 V rail - clamps positive transients from inductive load switching. Use Value: Withstands 50 A surge current (IFSM) and 175 °C junction temperature, ensuring reliability in high-ambient-temperature control cabinets. |
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 | Higher clamping voltage (43.5 V), larger SMA (DO-214AC) package (4.5 × 2.7 × 2.2 mm), 200 W rating same. | Less suitable for space-constrained USB/HDMI ports; better for higher-energy surges due to lower thermal resistance. | Select SMAJ24A-E3/57T when board area allows and surge energy exceeds 200 W capability of SMF24A-E3-08. |
| TPD2EUSB30DRYR | 3-channel, 0.8 pF per line, integrated ESD array for USB 3.0; no discrete 24 V standoff - rated for 5.5 V operation. | Designed for high-speed differential pairs (TX/RX) with ultra-low capacitance; incompatible with 24 V signal rails. | Choose TPD2EUSB30DRYR only for 5 V USB 3.0 SuperSpeed lanes where sub-1 pF loading is mandatory. |
Compared with SMAJ24A-E3/57T and TPD2EUSB30DRYR, SMF24A-E3-08 uniquely balances 24 V standoff, compact DO-219AB size, and 244 pF capacitance - making it optimal for cost-sensitive, space-limited 24 V industrial I/O and automotive body electronics where USB 2.0 speed suffices.
Availability
SMF24A-E3-08 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive infotainment ports, and 24 V PLC digital I/O modules requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant ESD protection.
Supply support for SMF24A-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 power management, sensing, and circuit protection components with emphasis on reliability, precision, and automotive-grade qualification.
The SMF series targets high-reliability transient suppression in space-constrained, high-volume applications - engineered specifically for ESD and surge protection in automotive, industrial, and computing interfaces where low profile and AEC-Q101 compliance are mandatory.
FAQ
What is the maximum clamping voltage of SMF24A-E3-08 under standard test conditions?
The SMF24A-E3-08 has a maximum reverse clamping voltage (VC) of 38.9 V when subjected to a 10/1000 μs waveform with a peak pulse current (IPPM) of 5.1 A. This value is measured at the device terminals and represents the worst-case overvoltage imposed on the protected circuit during surge events - critical for verifying compatibility with downstream ICs rated for ≤42 V absolute maximum.
Is SMF24A-E3-08 suitable for protecting USB 2.0 data lines?
Yes, SMF24A-E3-08 is suitable for USB 2.0 data line protection due to its 244 pF capacitance at 0 V and 1 MHz, which preserves signal integrity at 480 Mbps while providing ±30 kV IEC 61000-4-2 ESD immunity. However, it must be placed as a line-to-ground device on each D+ and D− line with proper grounding to avoid skew; it is not appropriate for USB 3.0 or higher-speed interfaces.
Does SMF24A-E3-08 meet AEC-Q101 qualification requirements?
Yes, SMF24A-E3-08 is AEC-Q101 qualified - confirmed in Vishay's official documentation (Rev. 2.4, 04-Jul-2023). This qualification covers stress tests including high-temperature reverse bias (HTRB), temperature cycling, and mechanical shock, validating its suitability for automotive applications such as infotainment, body control, and sensor modules operating from −65 °C to +175 °C.
What is the package type and footprint compatibility of SMF24A-E3-08?
SMF24A-E3-08 uses the DO-219AB package (also branded SMF), measuring 3.9 × 1.9 × 1.08 mm. It is mechanically and solder-reflow compatible with the SOD-123W footprint, enabling drop-in replacement in existing designs using that outline. The cathode is marked with a bar on the top surface, and orientation follows standard carrier tape direction per Vishay's specification S8-V-3717.02-003.
How does the 24 V standoff voltage (VRWM) of SMF24A-E3-08 affect its use in 24 V systems?
The 24 V VRWM of SMF24A-E3-08 means it remains non-conductive under normal 24 V DC operation, allowing safe integration into 24 V industrial I/O and automotive power domains. It begins clamping only when transients exceed ~26.7 V (VBR min), making it ideal for protecting 24 V sensor inputs, PLC digital inputs, and CAN FD physical layers without leakage or false triggering during nominal operation.
SMF24A-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):
- 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-E3-08 FAQ
1.How can I place an order for SMF24A-E3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF24A-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 SMF24A-E3-08 reliable?
The price and inventory of SMF24A-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 SMF24A-E3-08 is usually 5 days.
3.What payment methods are accepted for SMF24A-E3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF24A-E3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF24A-E3-08?
SMF24A-E3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF24A-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 SMF24A-E3-08?
For technical support, including SMF24A-E3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF24A-E3-08 requirements.
6.How does Aetrix verify that SMF24A-E3-08 is sourced from the original manufacturer or authorized distributors?
All SMF24A-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 SMF24A-E3-08 meets industry standards.
7.What is the process for return or replacement of SMF24A-E3-08?
All SMF24A-E3-08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF24A-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 SMF24A-E3-08 part is unused and in its original packaging.
Return procedure for SMF24A-E3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF24A-E3-08 Tags
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