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Vishay General Semiconductor - Diodes Division SMF20A-HM3-08
- Part No.:
- SMF20A-HM3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF20A-HM3-08.pdf
- Description:
- TVS DIODE 20VWM 32.4VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:29,677
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Product details
Overview
SMF20A-HM3-08 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 and power rails. It features a 20 V standoff voltage (VRWM), 22.2–24.6 V reverse breakdown (VBR), 32.4 V maximum clamping voltage at 6.2 A peak pulse current, ±30 kV IEC 61000-4-2 ESD immunity, and 200 W peak pulse power (10/1000 μs).
For engineers reviewing the SMF20A-HM3-08 datasheet, SMF20A-HM3-08 pinout, SMF20A-HM3-08 application, or SMF20A-HM3-08 equivalent, key selection criteria include clamping voltage under surge, leakage current at VRWM (≤0.1 μA), capacitance (283 pF at 0 V), AEC-Q101 qualification status, and SOD-123W-compatible footprint compatibility.
Technical Context
This device operates as a single-channel unidirectional TVS diode with avalanche breakdown behavior, optimized for low-clamping, fast-response ESD and surge protection in automotive and industrial interfaces. Its "Low Noise" technology enables sub-nanosecond response time, and it meets IEC 61000-4-2 (±30 kV contact/air) and AEC-Q101 Class H3B (>8 kV HBM) requirements.
The SMF20A-HM3-08 uses a planar junction structure in a low-profile DO-219AB package with cathode-bar marking, rated for continuous operation from –65 °C to +175 °C and capable of handling 50 A non-repetitive forward surge current (8.3 ms half-sine). Thermal resistance (RthJA) is 180 K/W on a 3 mm × 3 mm Cu pad.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 20 V - Maximum continuous reverse working voltage before significant leakage begins; defines safe operating margin for protected line. |
| Breakdown Voltage (VBR) | 22.2–24.6 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering above normal signal swing. |
| Clamping Voltage (VC) | 32.4 V at 6.2 A (10/1000 μs) - Peak voltage seen by downstream circuit during worst-case surge; critical for IC survivability. |
| Peak Pulse Power | 200 W (10/1000 μs) - Sustains transient energy without failure; supports robust system-level EMC compliance. |
| Capacitance (CD) | 283 pF at 0 V, 1 MHz - Impacts high-speed signal integrity; suitable for USB 2.0, CAN, and industrial sensor interfaces. |
| Leakage Current (IR) | ≤0.1 μA at VRWM - Minimizes standby power loss and avoids false triggering in low-power systems. |
| ESD Rating | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - Exceeds Level 4 immunity; eliminates need for secondary ESD stages. |
Pinout & Package
The SMF20A-HM3-08 is housed in a DO-219AB (SMF) package - identical in outline to SOD-123W - with cathode indicated by a bar marking. Dimensions: 3.9 mm × 1.9 mm × 1.08 mm (L × W × H), MSL level 1, reflow-compatible up to 260 °C peak.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side (protected node) | Connected to signal or power line requiring ESD/surge protection; carries transient current into device. |
| Cathode | Ground reference (clamping node) | Connected to local ground plane; establishes clamping path and defines unidirectional polarity. |
Key Features
| Feature | Design Value |
|---|---|
| Low clamping voltage | 32.4 V at 6.2 A enables protection of 24 V-rated ICs without overvoltage stress during transients. |
| AEC-Q101 qualified | Qualified per AEC-Q101 Rev D - validated for automotive under-hood and infotainment applications requiring reliability certification. |
| Low-profile SMD package | DO-219AB footprint allows placement near connectors or ICs with minimal board area and height (<1.1 mm). |
| High ESD immunity | ±30 kV contact/air discharge exceeds IEC 61000-4-2 Level 4 - reduces field failure risk in handheld and industrial equipment. |
| Wave/reflow solderable | Compatible with standard SMT processes including lead-free reflow (peak 260 °C); no special assembly required. |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting analog voltage outputs (e.g., 0–20 mA, 0–10 V) of pressure/temperature sensors in factory automation cabinets exposed to ESD from maintenance personnel. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between sensor output and MCU ADC input to clamp fast transients before they reach precision front-end circuitry. Use Value: 283 pF capacitance avoids signal distortion at DC–10 kHz bandwidth; 32.4 V clamping prevents ADC saturation or latch-up during ±30 kV ESD events. | Use Scenario: Safeguarding LIN bus lines in door module ECUs where wiring harnesses are subject to cable discharge events during vehicle assembly or service. IC Role / Device Role / Timing Role: Line-side ESD suppressor on LIN TX/RX pins, mounted adjacent to connector to minimize inductance and maximize clamping effectiveness. Use Value: AEC-Q101 qualification ensures long-term reliability under thermal cycling (-40 °C to +125 °C ambient); 200 W pulse rating handles coupled surges from nearby relay switching. |
| USB 2.0 Data Line Protection | DC Power Rail Clamp |
Use Scenario: Shielding USB 2.0 D+/D− lines in medical diagnostic devices against ESD during cable insertion/removal in clinical environments. IC Role / Device Role / Timing Role: Bidirectional-capable layout using two SMF20A-HM3-08 devices (anode-to-anode) to protect both differential lines symmetrically. Use Value: Sub-ns response time prevents ESD-induced bit errors; 283 pF total capacitance maintains signal rise/fall times within USB 2.0 specification (≤1.5 ns). | Use Scenario: Clamping 24 V supply rail transients in programmable logic controllers (PLCs) caused by inductive load switching or lightning-induced surges on field wiring. IC Role / Device Role / Timing Role: Unidirectional TVS connected between 24 V rail and chassis ground to shunt surge energy away from downstream regulators and microcontrollers. Use Value: 22.2–24.6 V VBR ensures stable conduction only during overvoltage events; 50 A IFSM rating supports repetitive 8.3 ms surges without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A-E3/5A (Vishay) | DO-214AC (SMA) package; higher RthJA (200 K/W); same VRWM/VBR/VC specs; 400 W peak power (400 W @ 10/1000 μs). | Larger footprint (4.5 × 2.7 mm); less suitable for space-constrained USB or sensor nodes; better for high-energy power rail clamping. | Select SMAJ20A-E3/5A when higher surge energy handling is needed and board space permits larger package. |
| TPD2E001DRYR (TI) | 0402 dual-channel ESD array; 15 pF typical capacitance; ±12 kV IEC 61000-4-2; not AEC-Q101 qualified; 5 V VRWM. | Designed for high-speed digital lines (USB, HDMI); insufficient for 24 V rail protection; lacks automotive qualification. | Choose TPD2E001DRYR only for low-voltage, high-frequency data lines where ultra-low capacitance is mandatory. |
Compared with SMAJ20A-E3/5A and TPD2E001DRYR, the SMF20A-HM3-08 uniquely balances AEC-Q101 qualification, 20 V standoff, compact DO-219AB size, and ±30 kV ESD rating - making it optimal for automotive body electronics and industrial 24 V interface protection where reliability and space efficiency are jointly critical.
Availability
SMF20A-HM3-08 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, USB 2.0 data line protection, and 24 V DC power rail clamping requiring stable component supply across production lifecycles.
Supply support for SMF20A-HM3-08 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 protection components with emphasis on reliability, miniaturization, and automotive-grade qualification.
The SMF series targets high-reliability ESD and surge protection in automotive, industrial, and communications systems - engineered for low clamping, fast response, and seamless integration into space-constrained SMT layouts.
FAQ
What is the clamping voltage of the SMF20A-HM3-08 under a 10/1000 μs surge?
The SMF20A-HM3-08 has a maximum clamping voltage (VC) of 32.4 V at 6.2 A peak pulse current with a 10/1000 μs waveform. This value is measured per IEC 61000-4-5 test conditions and represents the highest voltage imposed on the protected line during standardized surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is the SMF20A-HM3-08 AEC-Q101 qualified?
Yes, the SMF20A-HM3-08 is AEC-Q101 qualified per Rev D, meeting requirements for human body model (HBM) >8 kV and full temperature cycling, humidity, and mechanical stress testing. This qualification confirms suitability for automotive applications including body electronics, infotainment, and powertrain subsystems where long-term reliability under harsh environmental conditions is mandatory.
What package type does the SMF20A-HM3-08 use, and is it compatible with automated assembly?
The SMF20A-HM3-08 uses the DO-219AB (SMF) package - dimensionally compatible with SOD-123W - and is fully compatible with automated SMT assembly. It supports wave and reflow soldering, including lead-free processes with peak temperatures up to 260 °C, and is rated MSL level 1 per J-STD-020, eliminating bake requirements prior to assembly.
How does the capacitance of SMF20A-HM3-08 affect high-speed signal integrity?
The SMF20A-HM3-08 exhibits 283 pF typical capacitance at 0 V and 1 MHz, which limits its use to signals below ~10 MHz. In USB 2.0 applications, this capacitance is acceptable when used differentially (two devices) and placed close to connectors, but it is unsuitable for HDMI or PCIe. For higher-speed interfaces, lower-capacitance alternatives must be selected - the SMF20A-HM3-08 is optimized for robustness, not bandwidth.
What is the maximum continuous operating temperature range for SMF20A-HM3-08?
The SMF20A-HM3-08 is rated for continuous operation from –65 °C to +175 °C, matching the junction temperature limit (TJ = 175 °C) and storage temperature range (Tstg). This wide range supports deployment in under-hood automotive environments, industrial motor drives, and outdoor equipment where extreme thermal cycling occurs without derating.
SMF20A-HM3-08 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):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 6.2A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 283pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF20A-HM3-08 FAQ
1.How can I place an order for SMF20A-HM3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF20A-HM3-08 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 SMF20A-HM3-08 reliable?
The price and inventory of SMF20A-HM3-08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF20A-HM3-08 is usually 5 days.
3.What payment methods are accepted for SMF20A-HM3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF20A-HM3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF20A-HM3-08?
SMF20A-HM3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF20A-HM3-08 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 SMF20A-HM3-08?
For technical support, including SMF20A-HM3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF20A-HM3-08 requirements.
6.How does Aetrix verify that SMF20A-HM3-08 is sourced from the original manufacturer or authorized distributors?
All SMF20A-HM3-08 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 SMF20A-HM3-08 meets industry standards.
7.What is the process for return or replacement of SMF20A-HM3-08?
All SMF20A-HM3-08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF20A-HM3-08, 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 SMF20A-HM3-08 part is unused and in its original packaging.
Return procedure for SMF20A-HM3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF20A-HM3-08 Tags
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