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Vishay General Semiconductor - Diodes Division SMF24A-HM3-18
- Part No.:
- SMF24A-HM3-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF24A-HM3-18.pdf
- Description:
- TVS DIODE 24VWM 38.9VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:8,068
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Product details
Overview
SMF24A-HM3-18 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 standoff voltage (VRWM), 26.7–29.6 V breakdown range (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-HM3-18 datasheet, SMF24A-HM3-18 pinout, SMF24A-HM3-18 application, or SMF24A-HM3-18 equivalent, key selection criteria include clamping performance under 10/1000 μs surge, ±30 kV IEC 61000-4-2 ESD immunity, AEC-Q101 qualification status, low-profile SOD-123W-compatible footprint, and thermal resistance of 180 K/W on standard PCB pads.
Technical Context
The SMF24A-HM3-18 operates as a single-channel unidirectional TVS diode with avalanche breakdown behavior, providing fast response (<1 ns) to electrostatic discharge events per IEC 61000-4-2. Its low incremental surge resistance ensures stable clamping during 50 A forward surge pulses, while its 244 pF junction capacitance supports signal integrity in sub-480 Mbps interfaces.
Designed for reflow and wave soldering, it meets MSL Level 1 per J-STD-020 and uses UL 94 V-0 molding compound. The device sustains operation across –65 °C to +175 °C and is qualified to AEC-Q101 for automotive-grade reliability - confirmed by H3B-class human body model (>8 kV) and ±30 kV contact/air discharge ratings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 24 V - maximum continuous reverse operating voltage before leakage exceeds 0.1 μA; defines safe operating margin for 24 V nominal systems. |
| Breakdown Voltage (VBR) | 26.7–29.6 V at 1 mA - guaranteed avalanche initiation range ensuring predictable turn-on during transients. |
| Clamping Voltage (VC) | 38.9 V max at 5.1 A (10/1000 μs) - limits downstream voltage stress to protect 3.3 V/5 V logic interfaces. |
| Peak Pulse Power (PPP) | 200 W at 10/1000 μs - sustains short-duration surges without degradation in standard PCB mounting. |
| Junction Capacitance (CD) | 244 pF at 0 V, 1 MHz - compatible with USB 2.0 and RS-485 signaling; low enough to avoid signal distortion. |
| ESD Rating | ±30 kV contact & air discharge (IEC 61000-4-2) - exceeds industrial and automotive ESD immunity requirements. |
| Thermal Resistance (RthJA) | 180 K/W on 3 mm × 3 mm Cu pads - enables reliable power dissipation without heatsinking in compact layouts. |
Pinout & Package
SMF24A-HM3-18 is housed in the DO-219AB (SMF) package - identical in outline to SOD-123W, with 1.9 mm width, 3.9 mm length, and 1.08 mm height. Cathode is marked by a bar on the top surface. The device is bidirectional in layout but functions as a unidirectional TVS due to internal structure.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-impedance return path; completes clamping loop during transient events. |
| Cathode | High-side connection point | Connected to protected line (e.g., USB D+, HDMI TMDS+); blocks DC bias while shunting ESD to ground. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Enables robust protection against lightning-induced surges and system-level transients in industrial control inputs. |
| ±30 kV ESD immunity (IEC 61000-4-2) | Eliminates need for secondary ESD staging in front-panel connectors and handheld device interfaces. |
| AEC-Q101 qualified (H3B class) | Validates suitability for automotive infotainment, body electronics, and ADAS sensor interfaces without additional qualification. |
| Low-profile DO-219AB package | Reduces board space vs. SMA/SMB packages while maintaining compatibility with SOD-123W pick-and-place tooling. |
| 180 K/W thermal resistance | Supports sustained operation at full-rated power in thermally constrained enclosures without derating. |
Applications
| USB 2.0 Data Lines | HDMI Interface Protection |
|---|---|
Use Scenario: Protecting D+ and D− lines in portable USB hosts and peripherals against ESD during hot-plug events. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between signal line and ground, clamping transients within 1 ns. Use Value: Maintains signal integrity with 244 pF capacitance while limiting clamping voltage to 38.9 V - below USB 2.0 PHY damage threshold. |
Use Scenario: Safeguarding TMDS clock and data channels in HDMI 1.4 receivers against factory handling and field ESD. IC Role / Device Role / Timing Role: Line-to-ground transient suppressor with low capacitance to preserve 2.25 Gbps eye diagram integrity. Use Value: Delivers ±30 kV ESD immunity without degrading rise/fall times, verified per HDMI compliance test procedures. |
| Industrial I/O Ports | Automotive Sensor Interfaces |
Use Scenario: Shielding 24 V digital input modules from induced surges in PLC backplanes and factory floor wiring. IC Role / Device Role / Timing Role: Standoff-rated TVS for 24 V rail protection, activated only during >26.7 V transients. Use Value: Withstands repeated 200 W surges and operates across –65 °C to +175 °C - suitable for unheated outdoor enclosures. |
Use Scenario: Protecting LIN bus or analog sensor outputs (e.g., temperature, pressure) in engine compartments. IC Role / Device Role / Timing Role: AEC-Q101-qualified unidirectional clamp integrated into sensor module PCBs. Use Value: Meets automotive ESD requirements without requiring external filtering components, reducing BOM count. |
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 package (4.5 mm × 2.7 mm), 400 pF capacitance | Less suitable for high-speed data lines; better for 24 V power rail protection where capacitance is not critical | Select when board space allows larger footprint and higher clamping tolerance is acceptable |
| TPD2E001DRYR | 2-channel, 15 pF per line, 12 V VRWM, not AEC-Q101 qualified, 5 V tolerant I/O | Targeted at low-voltage, high-speed digital interfaces (e.g., I²C, GPIO), not 24 V systems | Choose for space-constrained multi-line protection below 5 V; not a direct replacement for SMF24A-HM3-18 |
Compared with SMAJ24A-E3/57T and TPD2E001DRYR, the SMF24A-HM3-18 uniquely balances 24 V standoff, 38.9 V clamping, 244 pF capacitance, and AEC-Q101 qualification in a low-profile DO-219AB package - making it optimal for automotive and industrial 24 V data line protection where size and reliability are co-prioritized.
Availability
SMF24A-HM3-18 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, HDMI 1.4 channel safeguarding, and industrial 24 V I/O port hardening requiring stable component supply across production lifecycles.
Supply support for SMF24A-HM3-18 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 compact, high-performance ESD protection in space-constrained applications - engineered for AEC-Q101 compliance, low capacitance, and robust surge handling in consumer, automotive, and industrial electronics.
FAQ
What is the clamping voltage of the SMF24A-HM3-18 under a 10/1000 μs surge?
The SMF24A-HM3-18 has a maximum clamping voltage (VC) of 38.9 V when subjected to its rated peak pulse current of 5.1 A with a 10/1000 μs waveform. This value is measured per standard test conditions and ensures downstream ICs operating at 3.3 V or 5 V remain within safe voltage margins during transient events. The SMF24A-HM3-18 achieves this clamping performance while maintaining low incremental surge resistance.
Is the SMF24A-HM3-18 qualified to AEC-Q101?
Yes, the SMF24A-HM3-18 is AEC-Q101 qualified and rated for H3B-class human body model (HBM) with >8 kV ESD tolerance. It also meets ±30 kV contact and air discharge per IEC 61000-4-2. This qualification is documented in Vishay's official specification document 85881 (Rev. 2.4), confirming its suitability for automotive electronics such as body control modules and sensor interfaces.
What package does the SMF24A-HM3-18 use, and is it compatible with SOD-123W footprints?
The SMF24A-HM3-18 uses the DO-219AB (SMF) package, which is mechanically compatible with SOD-123W, SOD-123F, and SOD-123FL outlines. Its dimensions are 3.9 mm × 1.9 mm × 1.08 mm, and Vishay explicitly states compatibility in the datasheet. The cathode is marked by a bar, and the device is optimized for reflow soldering with peak temperatures up to 260 °C.
What is the junction capacitance of the SMF24A-HM3-18, and how does it affect high-speed signal lines?
The SMF24A-HM3-18 has a typical junction capacitance of 244 pF at 0 V and 1 MHz. This value is measured under standardized conditions and supports reliable operation on USB 2.0 and RS-485 links, where signal rise times exceed ~1 ns. While higher than some ultra-low-capacitance TVS devices, this capacitance avoids excessive signal attenuation or timing skew in sub-480 Mbps applications when properly laid out.
Does the SMF24A-HM3-18 support both contact and air discharge ESD testing per IEC 61000-4-2?
Yes, the SMF24A-HM3-18 is rated for ±30 kV contact discharge and ±30 kV air discharge per IEC 61000-4-2 (10 pulses each). This dual rating is confirmed in the Absolute Maximum Ratings table of Vishay's document 85881 and reflects its "Low Noise" fast-response technology. The SMF24A-HM3-18 maintains consistent clamping performance across both test modes without parameter shift or failure.
SMF24A-HM3-18 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:
- -
- 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-HM3-18 FAQ
1.How can I place an order for SMF24A-HM3-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF24A-HM3-18 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-HM3-18 reliable?
The price and inventory of SMF24A-HM3-18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF24A-HM3-18 is usually 5 days.
3.What payment methods are accepted for SMF24A-HM3-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF24A-HM3-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF24A-HM3-18?
SMF24A-HM3-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF24A-HM3-18 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-HM3-18?
For technical support, including SMF24A-HM3-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF24A-HM3-18 requirements.
6.How does Aetrix verify that SMF24A-HM3-18 is sourced from the original manufacturer or authorized distributors?
All SMF24A-HM3-18 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-HM3-18 meets industry standards.
7.What is the process for return or replacement of SMF24A-HM3-18?
All SMF24A-HM3-18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF24A-HM3-18, 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-HM3-18 part is unused and in its original packaging.
Return procedure for SMF24A-HM3-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF24A-HM3-18 Tags
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