My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMF40A-HE3-08
- Part No.:
- SMF40A-HE3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF40A-HE3-08.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,339
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMF40A-HE3-08 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in the SMF (DO-219AB) package, designed for transient voltage suppression on data and signal lines. It features a 40 V standoff voltage (VRWM), 44.4–49.1 V reverse breakdown (VBR), 64.5 V maximum clamping voltage at 3.1 A peak pulse current (IPPM), 200 W peak pulse power (10/1000 μs), and ±30 kV IEC 61000-4-2 ESD immunity - deployed in automotive infotainment USB ports.
For engineers reviewing the SMF40A-HE3-08 datasheet, SMF40A-HE3-08 pinout, SMF40A-HE3-08 application, or SMF40A-HE3-08 equivalent, key selection criteria include clamping voltage margin vs. protected IC's absolute maximum rating, capacitance (172 pF at 0 V) for high-speed interface integrity, AEC-Q101 qualification status, SOD-123W-compatible footprint, and thermal resistance (180 K/W) for board-level power dissipation planning.
Technical Context
This device operates as a single-channel, unidirectional TVS diode with avalanche breakdown behavior, optimized for fast response (<1 ns) to electrostatic discharge events. Its low incremental surge resistance ensures minimal voltage overshoot during 8/20 μs and 10/1000 μs transients per IEC 61000-4-5 and IEC 61000-4-2.
The SMF40A-HE3-08 uses "Low Noise" silicon technology and is qualified to AEC-Q101 for automotive applications. It supports wave and reflow soldering, with MSL level 1 handling and peak temperature tolerance up to 260 °C - enabling compatibility with standard PCB assembly processes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 40 V - maximum continuous reverse operating voltage before clamping begins; sets upper limit for normal signal swing. |
| Breakdown Voltage (VBR) | 44.4–49.1 V at 1 mA - defines onset of avalanche conduction; ensures reliable triggering above system operating voltage. |
| Clamping Voltage (VC) | 64.5 V at 3.1 A (10/1000 μs) - peak voltage seen by protected circuit during surge; must stay below downstream IC's absolute max rating. |
| Peak Pulse Power (PPP) | 200 W (10/1000 μs) - energy-handling capability for common surge waveforms; determines survivability under repetitive ESD stress. |
| Capacitance (CD) | 172 pF at 0 V, 1 MHz - impacts signal integrity on high-speed lines (e.g., USB 2.0); requires layout compensation for impedance matching. |
| ESD Immunity | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - exceeds industrial and automotive ESD requirements; eliminates need for external staging networks. |
| Operating Temp Range | −65 °C to +175 °C - supports under-hood and engine-control module deployment without derating. |
Pinout & Package
SMF40A-HE3-08 is housed in the DO-219AB (SMF) package - a low-profile, surface-mount case compatible with SOD-123W, SOD-123F, and SOD-123FL footprints. Dimensions: 3.9 mm × 1.9 mm × 1.08 mm (L × W × H), with cathode marked by a bar on the top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Signal line input (protected side) | Connected to I/O trace upstream of protected IC; conducts surge current to cathode during reverse overvoltage. |
| Cathode | Ground reference / return path | Connected to low-impedance chassis or signal ground plane; completes clamping path and defines unidirectional polarity. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use including temperature cycling, mechanical shock, and humidity testing - enables drop-in integration into ADAS and infotainment ECUs. |
| 200 W peak pulse power (10/1000 μs) | Handles multiple ESD strikes without degradation - supports long-term reliability in high-touch consumer and vehicle interfaces. |
| ±30 kV IEC 61000-4-2 ESD immunity | Meets highest contact/air discharge levels required for automotive interior buttons, touchscreens, and USB-C ports. |
| Low-profile DO-219AB package | 1.08 mm height enables use in space-constrained modules (e.g., rearview camera PCBs) while maintaining thermal performance via 180 K/W RthJA. |
| "Low Noise" fast-response technology | Sub-1 ns response time minimizes voltage overshoot during ESD events - critical for protecting 3.3 V or 5 V logic interfaces with tight VIH/VIL margins. |
Applications
| Automotive USB Port Protection | Industrial HMI Touchscreen Interface |
|---|---|
Use Scenario: Protecting USB 2.0 D+/D− lines in vehicle infotainment head units exposed to repeated user ESD events. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between connector and USB transceiver IC to clamp transients before they reach PHY pins. Use Value: 172 pF capacitance avoids signal rise-time degradation on 480 Mbps links; 64.5 V clamping stays safely below USB IC's 65 V abs-max rating. | Use Scenario: Safeguarding resistive/capacitive touchscreen controller I/Os in factory HMIs subject to operator finger discharge. IC Role / Device Role / Timing Role: Standoff-clamp TVS on analog sense lines and digital command buses to prevent latch-up or gate oxide damage. Use Value: −65 °C to +175 °C operation ensures functionality across uncontrolled ambient environments; AEC-Q101 grade confirms robustness for 10+ year deployments. |
| Automotive Camera Module Data Lines | Smart Building Sensor Node I²C Bus |
Use Scenario: Transient suppression on MIPI CSI-2 differential pairs in rearview/parking cameras mounted near metal chassis. IC Role / Device Role / Timing Role: Single-channel unidirectional suppressor on each data lane, referenced to isolated camera ground to avoid ground loop injection. Use Value: 200 W pulse rating withstands coupled surges from nearby solenoid switching; DO-219AB footprint allows routing beneath connectors. | Use Scenario: ESD hardening of I²C SDA/SCL lines connecting environmental sensors (temp/humidity/CO₂) to gateway MCU in HVAC control panels. IC Role / Device Role / Timing Role: Low-capacitance TVS on bidirectional open-drain bus to preserve rise/fall times while blocking >8 kV HBM discharges. Use Value: 172 pF capacitance maintains I²C timing compliance at 400 kHz; 40 V VRWM accommodates 3.3 V or 5 V bus voltages with margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40A-E3/5A (Vishay) | DO-214AC (SMA) package; higher RthJA (200 K/W); same 40 V VRWM, but 69.4 V VC at 3.0 A. | Larger footprint (4.5 × 2.7 mm); less suitable for ultra-thin modules; better heat spreading on large copper areas. | Select SMAJ40A-E3/5A when board space allows larger package and thermal management relies on copper pour rather than component height constraints. |
| TPD2EUSB30DRYR (TI) | Array device (2-channel); 0.8 pF typical capacitance; 5 V VRWM; not unidirectional; integrated ESD + EMI filtering. | Designed for high-speed USB 3.0; incompatible with 40 V rail protection; requires redesign for voltage level and channel count. | Choose TPD2EUSB30DRYR only for new USB 3.0 designs needing <1 pF loading; not a functional substitute for SMF40A-HE3-08's 40 V standoff or automotive qualification. |
Compared with SMAJ40A-E3/5A and TPD2EUSB30DRYR, SMF40A-HE3-08 uniquely balances 40 V standoff, AEC-Q101 qualification, 1.08 mm profile, and 172 pF capacitance - making it optimal for legacy and cost-sensitive automotive signal-line protection where space and qualification are non-negotiable.
Availability
SMF40A-HE3-08 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial human-machine interfaces, and smart building sensor nodes requiring stable component supply across extended product lifecycles.
Supply support for SMF40A-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 Intertechnology is a global semiconductor manufacturer specializing in discrete components, sensors, and passive elements, with emphasis on reliability, precision, and automotive-grade validation.
The SMF series targets high-reliability ESD protection in space-constrained, thermally demanding environments - specifically engineered for automotive signal integrity and industrial interface robustness.
FAQ
What is the clamping voltage of SMF40A-HE3-08 at its rated peak pulse current?
The SMF40A-HE3-08 has a maximum clamping voltage (VC) of 64.5 V at 3.1 A peak pulse current (IPPM) under a 10/1000 μs waveform. This value is measured per IEC 61000-4-5 test conditions and represents the highest voltage the protected circuit will experience during a defined surge event. Designers must ensure this clamping level remains below the absolute maximum voltage rating of the downstream IC being protected. The SMF40A-HE3-08 datasheet specifies this parameter in the Electrical Characteristics table on page 2.
Is SMF40A-HE3-08 qualified to AEC-Q101?
Yes, SMF40A-HE3-08 is AEC-Q101 qualified, as confirmed in the Vishay SMF5V0A to SMF58A datasheet (Rev. 2.4, July 2023), section "Features". This qualification covers stress tests including temperature cycling, mechanical shock, and humidity resistance - validating suitability for automotive applications such as infotainment, body control, and ADAS modules. The "HE3" suffix denotes AEC-Q101 qualification and RoHS-compliant, lead-free terminations. SMF40A-HE3-08 meets the full AEC-Q101-004 standard for discrete semiconductors.
What is the capacitance of SMF40A-HE3-08 and how does it affect high-speed signal lines?
The SMF40A-HE3-08 exhibits a typical capacitance (CD) of 172 pF at 0 V and 1 MHz, as specified in the Electrical Characteristics table. This value directly impacts signal integrity on high-speed interfaces like USB 2.0 or MIPI CSI-2: excessive capacitance can degrade edge rates, increase bit error rates, and cause impedance mismatch. For USB 2.0 (480 Mbps), 172 pF is acceptable with proper layout (short traces, ground isolation); however, it is not suitable for USB 3.0 or HDMI. The SMF40A-HE3-08 is intended for medium-speed signal protection where robustness outweighs ultra-low capacitance needs.
What package type does SMF40A-HE3-08 use and what are its key mechanical dimensions?
SMF40A-HE3-08 uses the DO-219AB (SMF) package - a low-profile surface-mount outline compatible with SOD-123W, SOD-123F, and SOD-123FL land patterns. Its mechanical dimensions are 3.9 mm (length) × 1.9 mm (width) × 1.08 mm (height), with cathode indicated by a bar marking. The package supports wave and reflow soldering, has MSL level 1 rating, and withstands peak temperatures up to 260 °C. These characteristics make SMF40A-HE3-08 ideal for compact, thermally constrained automotive PCBs where height clearance is limited.
How does the standoff voltage (VRWM) of SMF40A-HE3-08 relate to system operating voltage?
The SMF40A-HE3-08 has a maximum standoff voltage (VRWM) of 40 V - meaning it remains non-conductive under continuous reverse bias up to this level. This value must exceed the system's normal operating voltage (e.g., 24 V automotive battery rail or 36 V industrial bus) with sufficient margin to accommodate ripple, transients, and tolerances. For example, in a 24 V system, 40 V VRWM provides ~67 % headroom, ensuring no leakage or premature clamping during nominal operation. The SMF40A-HE3-08's 40 V rating makes it appropriate for 24 V and 36 V applications but unsuitable for 48 V systems without derating analysis.
SMF40A-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):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 3.1A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 172pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF40A-HE3-08 FAQ
1.How can I place an order for SMF40A-HE3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF40A-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 SMF40A-HE3-08 reliable?
The price and inventory of SMF40A-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 SMF40A-HE3-08 is usually 5 days.
3.What payment methods are accepted for SMF40A-HE3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF40A-HE3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF40A-HE3-08?
SMF40A-HE3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF40A-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 SMF40A-HE3-08?
For technical support, including SMF40A-HE3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF40A-HE3-08 requirements.
6.How does Aetrix verify that SMF40A-HE3-08 is sourced from the original manufacturer or authorized distributors?
All SMF40A-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 SMF40A-HE3-08 meets industry standards.
7.What is the process for return or replacement of SMF40A-HE3-08?
All SMF40A-HE3-08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF40A-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 SMF40A-HE3-08 part is unused and in its original packaging.
Return procedure for SMF40A-HE3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF40A-HE3-08 Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
