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Vishay General Semiconductor - Diodes Division SMF24A-HE3-08
- Part No.:
- SMF24A-HE3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF24A-HE3-08.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:26,915
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Product details
Overview
SMF24A-HE3-08 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 stand-off voltage (VRWM), 26.7–29.6 V reverse breakdown range (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 - optimized for USB 2.0, HDMI, and industrial I/O port protection.
For engineers reviewing the SMF24A-HE3-08 datasheet, SMF24A-HE3-08 pinout, SMF24A-HE3-08 application, or SMF24A-HE3-08 equivalent, this device delivers AEC-Q101 qualified ESD immunity (±30 kV contact/air), low incremental surge resistance, and fast response time for robust interface-level surge protection in automotive infotainment, industrial HMI, and medical data ports.
Technical Context
The SMF24A-HE3-08 operates as a unidirectional TVS diode with cathode-anode polarity, leveraging silicon avalanche clamping to divert ESD transients before they reach sensitive downstream circuitry. Its DO-219AB package enables low-inductance layout and supports wave/reflow soldering per J-STD-020 MSL level 1.
It complies with IEC 61000-4-2 (±30 kV contact/air) and IEC 61000-4-5 (1000 W, 8/20 μs), with thermal resistance RthJA = 180 K/W on 3 mm × 3 mm Cu pads. The device maintains stable clamping performance across -65 °C to +175 °C operating temperature range and supports human body model (HBM) >8 kV per AEC-Q101 Class H3B.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 24 V - maximum continuous reverse voltage before significant leakage; defines safe operating margin for 24 V nominal bus lines. |
| Reverse Breakdown (VBR) | 26.7–29.6 V at 1 mA - onset of avalanche conduction; ensures reliable triggering above system operating voltage. |
| Clamping Voltage (VC) | 38.9 V max at 5.1 A (10/1000 μs) - limits transient voltage seen by protected ICs; critical for safeguarding 3.3 V/5 V logic interfaces. |
| Junction Capacitance (CD) | 244 pF at 0 V, 1 MHz - impacts signal integrity on high-speed lines; suitable for ≤480 Mbps USB 2.0 but not USB 3.x. |
| Peak Pulse Power (PPP) | 200 W (10/1000 μs), 1000 W (8/20 μs) - defines energy-handling capability for lightning-induced surges and EFT events. |
| ESD Immunity | ±30 kV contact / ±30 kV air per IEC 61000-4-2 - exceeds Level 4 requirements; eliminates need for secondary ESD stages in many designs. |
| Operating Temperature | -65 °C to +175 °C - supports under-hood automotive, industrial control, and harsh-environment applications without derating. |
Pinout & Package
SMF24A-HE3-08 uses the DO-219AB (SMF) package: low-profile (1.08 mm height), SOD-123W-compatible outline, molded UL 94 V-0 compound, and MSL level 1 rating. Cathode is marked by a bar on the device top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground reference terminal | Connected to system ground or low-impedance return path; completes clamping loop during ESD event. |
| Cathode | Protected line terminal | Connected to signal/data line (e.g., USB D+, HDMI TMDS+); conducts transient current to ground when voltage exceeds VRWM. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Handles repetitive ESD and surge events without degradation in compact PCB layouts. |
| ±30 kV IEC 61000-4-2 ESD immunity | Eliminates need for external ESD suppressors in front-end interface protection circuits. |
| AEC-Q101 qualified (Class H3B) | Validated for automotive-grade reliability including temperature cycling, humidity, and mechanical shock. |
| Low clamping voltage (38.9 V) | Protects 24 V-rated sensors and CAN transceivers while maintaining safe margin below absolute max ratings. |
| 244 pF junction capacitance | Enables use on moderate-speed digital interfaces (e.g., RS-485, CAN FD, LVDS) without signal distortion. |
Applications
| Automotive Infotainment | Industrial HMI Panel |
|---|---|
|
Use Scenario: Protecting USB 2.0 and HDMI ports in head units against ESD from user interaction and cable hot-plug events. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed directly at connector entry point to clamp transients before reaching USB PHY or HDMI serializer ICs. Use Value: Prevents latch-up or permanent damage to USB controller ICs during ±30 kV contact discharge, enabling compliance with ISO 10605. |
Use Scenario: Safeguarding RS-485 and CAN FD communication lines on factory-floor HMIs exposed to electrostatic discharge from operators and tools. IC Role / Device Role / Timing Role: Standoff-clamp TVS connected between differential pair and chassis ground to shunt common-mode ESD pulses. Use Value: Maintains signal integrity up to 5 Mbps CAN FD rates while limiting transient voltage to <40 V, preserving transceiver functionality. |
| Medical Data Interface | Smart Building Sensor Hub |
|
Use Scenario: Shielding UART and SPI lines connecting patient monitors to wireless gateways from ESD generated during clinical handling. IC Role / Device Role / Timing Role: Low-capacitance TVS on serial bus lines to suppress fast-rising ESD pulses without distorting sub-1 Mbps control signals. Use Value: Ensures uninterrupted data transmission during repeated ±30 kV air discharge events, meeting IEC 60601-1-2 ESD requirements. |
Use Scenario: Protecting PoE-powered sensor nodes (e.g., temperature, occupancy) from induced surges on Ethernet and analog input lines. IC Role / Device Role / Timing Role: Primary transient suppressor on 24 V DC input and 10/100BASE-TX pairs, coordinated with upstream PoE PD protection. Use Value: Withstands 1000 W (8/20 μs) surges per IEC 61000-4-5, preventing brownouts or resets in edge-node controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A-E3/5T | DO-214AC (SMA) package; higher RthJA (200 K/W); 40.2 V VC at 5.1 A; 250 pF capacitance. | Larger footprint and lower power density; less suitable for ultra-thin consumer modules. | Choose SMAJ24A-E3/5T only if legacy SMA layout exists or higher surge margin is required beyond 200 W. |
| TPD2E001DRYR | Quad-channel, 1.5 pF per channel, 5.5 V VRWM; integrated ESD array in USON-8; not rated for 24 V systems. | Designed for low-voltage high-speed interfaces (USB 3.0, DisplayPort); incompatible with 24 V signal rails. | Select TPD2E001DRYR only for sub-6 V data lines where ultra-low capacitance is mandatory and voltage rating aligns. |
Compared with SMAJ24A-E3/5T and TPD2E001DRYR, SMF24A-HE3-08 uniquely balances 24 V standoff, 200 W surge capability, and DO-219AB space efficiency - making it optimal for new 24 V industrial and automotive interface designs requiring AEC-Q101 validation and minimal board area.
Availability
SMF24A-HE3-08 is available at Aetrix Electronics and suitable for automotive infotainment, industrial HMI, and medical data interface applications requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant ESD protection.
Supply support for SMF24A-HE3-08 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, optoelectronics, and passive components for automotive, industrial, and computing markets.
The SMF series targets compact, high-power-density ESD protection for automotive and industrial interfaces, emphasizing AEC-Q101 qualification, low-profile packaging, and IEC 61000-4-2/4-5 compliance.
FAQ
What is the maximum clamping voltage of the SMF24A-HE3-08 under standard test conditions?
The SMF24A-HE3-08 has a maximum reverse 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 test conditions and ensures downstream ICs remain within safe operating voltage limits during surge events. The clamping performance is guaranteed across the full -65 °C to +175 °C operating range.
Is the SMF24A-HE3-08 qualified for automotive applications?
Yes, the SMF24A-HE3-08 is AEC-Q101 qualified and rated for Class H3B human body model (HBM) ESD immunity (>8 kV). It meets stringent automotive reliability requirements including temperature cycling, mechanical shock, and humidity testing. Its DO-219AB package and -65 °C to +175 °C operating range make it suitable for under-dash, infotainment, and ADAS subsystems where ESD robustness is critical.
What does the "HE3-08" suffix indicate in SMF24A-HE3-08?
The "HE3-08" suffix denotes Vishay's packaging and environmental coding: "H" indicates AEC-Q101 qualification, "E3" specifies lead (Pb)-free, RoHS-compliant terminations with tin plating, and "08" identifies 3000 pieces per 7-inch reel (8 mm tape, minimum order quantity 30 k). This matches the ordering code structure defined in Vishay document 85881 Rev. 2.4.
Can SMF24A-HE3-08 be used for bidirectional signal lines like RS-485?
No - the SMF24A-HE3-08 is a unidirectional TVS diode intended for single-ended or ground-referenced lines. For bidirectional differential interfaces such as RS-485, a bidirectional variant like SMF24CA-HE3-08 (not SMF24A-HE3-08) must be used. Using SMF24A-HE3-08 on bidirectional lines risks forward conduction during normal signal swings, causing malfunction or increased leakage.
How does the 244 pF capacitance of SMF24A-HE3-08 affect high-speed signal integrity?
The 244 pF typical junction capacitance of SMF24A-HE3-08 limits its use to interfaces operating ≤480 Mbps (e.g., USB 2.0 full-speed, RS-485, CAN FD at ≤5 Mbps). At higher frequencies, this capacitance introduces insertion loss and rise-time degradation. For USB 3.x or HDMI 2.0, lower-capacitance alternatives (<3 pF) are required - SMF24A-HE3-08 is intentionally optimized for cost-sensitive, moderate-speed industrial and automotive applications.
SMF24A-HE3-08 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:
- -
- Capacitance @ Frequency:
- 244pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF24A-HE3-08 FAQ
1.How can I place an order for SMF24A-HE3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF24A-HE3-08 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-HE3-08 reliable?
The price and inventory of SMF24A-HE3-08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF24A-HE3-08 is usually 5 days.
3.What payment methods are accepted for SMF24A-HE3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF24A-HE3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF24A-HE3-08?
SMF24A-HE3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF24A-HE3-08 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-HE3-08?
For technical support, including SMF24A-HE3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF24A-HE3-08 requirements.
6.How does Aetrix verify that SMF24A-HE3-08 is sourced from the original manufacturer or authorized distributors?
All SMF24A-HE3-08 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-HE3-08 meets industry standards.
7.What is the process for return or replacement of SMF24A-HE3-08?
All SMF24A-HE3-08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF24A-HE3-08, 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-HE3-08 part is unused and in its original packaging.
Return procedure for SMF24A-HE3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF24A-HE3-08 Tags
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