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Vishay SMF40A-HE3_A08
- Part No.:
- SMF40A-HE3_A08
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF40A-HE3_A08.pdf
- Description:
- ESD PROTECTION DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,022
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Product details
Overview
SMF40A-HE3_A08 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), 64.5 V maximum clamping voltage at 3.1 A peak pulse current, ±30 kV IEC 61000-4-2 ESD immunity, and 200 W peak pulse power (10/1000 μs). It is AEC-Q101 qualified and used in automotive infotainment interfaces.
For engineers reviewing the SMF40A-HE3_A08 datasheet, SMF40A-HE3_A08 pinout, SMF40A-HE3_A08 application, or SMF40A-HE3_A08 equivalent, this page delivers verified electrical specs, package dimensions, clamping behavior under surge, ESD robustness data, and validated alternatives for automotive-grade board-level protection design.
Technical Context
The SMF40A-HE3_A08 operates as a unidirectional TVS diode with avalanche breakdown mechanism, 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, while its 172 pF capacitance at 0 V supports high-speed USB 2.0 and CAN FD signal integrity.
Designed for mounting on epoxy-glass PCBs with 3 mm × 3 mm Cu pads, it achieves 180 K/W junction-to-ambient thermal resistance and sustains operation from –65 °C to +175 °C. The device meets AEC-Q101 stress test requirements including H3B-class human body model (>8 kV) and full IEC 61000-4-2 contact/air discharge compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 40 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal swing margin for 3.3 V/5 V/12 V bus lines. |
| Clamping Voltage (VC) | 64.5 V at IPPM = 3.1 A (10/1000 μs) - Peak voltage seen by protected IC during worst-case surge; enables robust interface IC survival. |
| Peak Pulse Power | 200 W (10/1000 μs) - Sustains short-duration surges without degradation; suitable for ISO 7637-2 pulse 1/2a/3a environments. |
| ESD Immunity | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - Exceeds industrial and automotive ESD immunity requirements without external filtering. |
| Capacitance | 172 pF at VR = 0 V, f = 1 MHz - Low enough for CAN FD (≤500 kbps) and RS-485, but not recommended for USB 3.0 or HDMI. |
| Operating Temp Range | –65 °C to +175 °C - Supports under-hood and powertrain applications where ambient temperatures exceed 125 °C. |
| AEC-Q101 Qualified | Yes - Validated for automotive use per stress tests including temperature cycling, HTGB, and HTRB; enables PPAP-ready designs. |
Pinout & Package
SMF40A-HE3_A08 uses the DO-219AB (SMF) package: low-profile, surface-mount, single-diode configuration with cathode marking bar. Dimensions: 3.9 mm × 1.9 mm × 1.08 mm (L × W × H); compatible with SOD-123W footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side | Connected to signal line requiring protection; referenced to system ground via cathode. |
| Cathode | Ground reference | Connected to chassis or signal ground plane; provides low-impedance path for surge current dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| "Low Noise" fast-response technology | Sub-nanosecond response time ensures clamping activation before sensitive ICs experience overstress during ESD events. |
| 200 W peak pulse power (10/1000 μs) | Supports repeated surge exposure in automotive load-dump adjacent circuits without parameter drift or failure. |
| AEC-Q101 qualification | Validates reliability for automotive electronics with extended lifetime expectations and harsh environmental exposure. |
| Wave and reflow solderable | Compatible with standard SMT processes up to 260 °C peak temperature; no special handling or pre-baking required. |
| UL 94 V-0 molding compound | Ensures flame-retardant behavior in enclosed modules meeting automotive interior material safety standards. |
Applications
| Automotive CAN Bus Protection | Industrial RS-485 Interface |
|---|---|
Use Scenario: Protecting CAN_H/CAN_L lines in vehicle body control modules exposed to ESD and load dump coupling. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between each CAN line and chassis ground to shunt transients. Use Value: Maintains <65 V clamping during 3.1 A surge, preserving CAN transceiver functionality per ISO 11898-2. |
Use Scenario: Safeguarding RS-485 transceivers in factory automation PLC I/O modules subject to field wiring ESD. IC Role / Device Role / Timing Role: Line-to-ground TVS on differential pair inputs to suppress common-mode surges without distorting signal edges. Use Value: 172 pF capacitance avoids signal rise-time degradation at 10 Mbps RS-485 rates; ±30 kV ESD rating exceeds IEC 61000-4-2 Level 4. |
| Automotive Infotainment USB Port | Power Supply Input Rail Clamp |
Use Scenario: ESD protection on USB 2.0 D+/D− lines in head unit front-panel connectors. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional diode (cathode grounded) providing low-capacitance, high-surge clamping. Use Value: Clamps to ≤64.5 V within nanoseconds, preventing latch-up or gate oxide damage in USB PHY ICs. |
Use Scenario: Secondary overvoltage clamp on 12 V supply rail feeding ADAS camera modules. IC Role / Device Role / Timing Role: Standoff-rated TVS placed between input rail and ground to absorb residual spikes after primary DC/DC filtering. Use Value: 40 V VRWM aligns with nominal 12 V systems with 100 % tolerance margin; 200 W rating handles ISO 7637-2 pulse 1 (inductive switch-off). |
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) | Higher clamping voltage (69.4 V), larger SMA (DO-214AC) package (4.5 mm × 2.7 mm), 400 W peak power (10/1000 μs). | Better suited for higher-energy surges but adds 3× board area; less optimal for space-constrained automotive modules. | Select SMAJ40A-E3/5A only when >200 W surge energy must be absorbed and footprint is unconstrained. |
| TPSMF40A (STMicroelectronics) | Identical DO-219AB package, same 40 V VRWM and 64.5 V VC, but rated for 30 kV contact/air per IEC 61000-4-2 only (not AEC-Q101). | Lacks automotive qualification; acceptable for industrial RS-485 but not for PPAP-compliant automotive ECUs. | Choose TPSMF40A for cost-sensitive industrial designs where AEC-Q101 is not mandated. |
Compared with SMAJ40A-E3/5A and TPSMF40A, SMF40A-HE3_A08 uniquely balances AEC-Q101 qualification, compact DO-219AB footprint, and verified 200 W/±30 kV performance-making it the preferred choice for space-limited, automotive-grade signal line protection.
Availability
SMF40A-HE3_A08 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial RS-485 networks, and ADAS power rail protection requiring stable component supply across multi-year production cycles.
Supply support for SMF40A-HE3_A08 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 leadership in high-reliability protection devices.
The SMF series targets automotive and industrial board-level ESD/surge protection, delivering AEC-Q101-qualified, low-capacitance TVS diodes in ultra-compact DO-219AB packages for next-generation signal integrity-critical systems.
FAQ
What is the clamping voltage of SMF40A-HE3_A08 at its rated peak pulse current?
The SMF40A-HE3_A08 has a maximum clamping voltage (VC) of 64.5 V when subjected to its rated peak pulse current of 3.1 A using a 10/1000 μs waveform. This value is measured per IEC 61000-4-5 test conditions and ensures downstream ICs remain within safe operating limits during surge events. The SMF40A-HE3_A08 maintains this clamping performance across its full operating temperature range.
Is SMF40A-HE3_A08 suitable for protecting USB 2.0 data lines?
Yes, SMF40A-HE3_A08 is suitable for USB 2.0 D+/D− line protection due to its 172 pF capacitance at 0 V, which preserves signal integrity up to 480 Mbps without excessive edge distortion. Its ±30 kV IEC 61000-4-2 rating and sub-ns response time prevent USB PHY latch-up. However, it is unidirectional and must be configured with cathode to ground; for bidirectional USB ports, dual-diode arrays may be preferred.
Does SMF40A-HE3_A08 meet AEC-Q101 requirements?
Yes, SMF40A-HE3_A08 is explicitly AEC-Q101 qualified per the Vishay datasheet Rev. 2.4 (04-Jul-2023), including human body model Class H3B (>8 kV), machine model, temperature cycling, and high-temperature reverse bias testing. This qualification confirms suitability for automotive electronic control units, infotainment systems, and ADAS modules requiring PPAP documentation.
What is the package type and footprint compatibility of SMF40A-HE3_A08?
SMF40A-HE3_A08 uses the DO-219AB (SMF) package: 3.9 mm × 1.9 mm × 1.08 mm, with cathode marking bar. It is footprint-compatible with SOD-123W, SOD-123F, and SOD-123FL packages per Vishay's documentation. The recommended land pattern matches the 2.9 mm × 1.4 mm pad layout shown in the official package drawing S8-V-3915.01-001.
How does the 200 W peak pulse power rating of SMF40A-HE3_A08 compare to industry standards?
The 200 W peak pulse power (10/1000 μs) of SMF40A-HE3_A08 exceeds typical requirements for IEC 61000-4-5 Level 3 (1 kV line-to-ground) and aligns with ISO 7637-2 Pulse 1 (inductive switch-off) in 12 V automotive systems. It provides 2.5× margin over baseline 80 W TVS diodes, enabling robust protection in noisy environments without derating. This rating is validated per Vishay's absolute maximum ratings table in document 85881.
SMF40A-HE3_A08 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay
- 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 (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF40A-HE3_A08 FAQ
1.How can I place an order for SMF40A-HE3_A08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF40A-HE3_A08 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_A08 reliable?
The price and inventory of SMF40A-HE3_A08 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_A08 is usually 5 days.
3.What payment methods are accepted for SMF40A-HE3_A08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF40A-HE3_A08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF40A-HE3_A08?
SMF40A-HE3_A08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF40A-HE3_A08 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_A08?
For technical support, including SMF40A-HE3_A08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF40A-HE3_A08 requirements.
6.How does Aetrix verify that SMF40A-HE3_A08 is sourced from the original manufacturer or authorized distributors?
All SMF40A-HE3_A08 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_A08 meets industry standards.
7.What is the process for return or replacement of SMF40A-HE3_A08?
All SMF40A-HE3_A08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF40A-HE3_A08, 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_A08 part is unused and in its original packaging.
Return procedure for SMF40A-HE3_A08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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