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Vishay General Semiconductor - Diodes Division SMF48A-HE3-08
- Part No.:
- SMF48A-HE3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF48A-HE3-08.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,940
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Product details
Overview
SMF48A-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 and power rails. It features a 48 V stand-off voltage (VRWM), 77.4 V maximum clamping voltage at 2.6 A peak pulse current, ±30 kV IEC 61000-4-2 ESD immunity, and 200 W peak pulse power (10/1000 μs). It is widely used in automotive infotainment interfaces and USB 2.0 port protection.
For engineers reviewing the SMF48A-HE3-08 datasheet, SMF48A-HE3-08 pinout, SMF48A-HE3-08 application, or SMF48A-HE3-08 equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, SOD-123W-compatible packaging details, and real-world ESD protection use cases - all aligned with Vishay's Rev. 2.4 specification (Doc. #85881).
Technical Context
The SMF48A-HE3-08 operates as a single-channel unidirectional TVS diode with avalanche breakdown behavior. Its junction temperature range spans −65 °C to +175 °C, and it achieves thermal resistance of 180 K/W when mounted on a 3 mm × 3 mm Cu pad epoxy PCB.
It complies with IEC 61000-4-2 (±30 kV contact/air discharge) and AEC-Q101 (H3B-class ESD, >8 kV HBM), and exhibits low incremental surge resistance and fast response time enabled by Vishay's "Low Noise" technology.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 48 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 42 V automotive systems. |
| Clamping Voltage (VC) | 77.4 V at IPPM = 2.6 A (10/1000 μs) - Peak voltage seen by protected circuit during surge; ensures downstream ICs remain below absolute max ratings. |
| Peak Pulse Power | 200 W (10/1000 μs) - Sustains short-duration transients without degradation; suitable for ISO 7637-2 pulse 1/2a/3a compliance testing. |
| ESD Immunity | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - Meets highest industrial and automotive ESD robustness requirements without external shielding. |
| Capacitance (CD) | 161 pF at VR = 0 V, f = 1 MHz - Low enough for USB 2.0 (480 Mbps) signal integrity; avoids excessive rise-time degradation. |
| Reverse Leakage (IR) | 0.1 μA at VRWM = 48 V - Negligible standby current draw; critical for battery-powered sensor nodes and always-on modules. |
| Package | DO-219AB (SOD-123W-compatible) - 3.9 mm × 1.9 mm × 1.08 mm low-profile footprint; supports automated reflow and wave soldering per J-STD-020 MSL level 1. |
Pinout & Package
SMF48A-HE3-08 uses the DO-219AB (SMF) package: a 2-terminal surface-mount device with cathode-bar marking. The package is compatible with SOD-123W, SOD-123F, and SOD-123FL footprints and features a molded UL 94 V-0 compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side terminal | Connected to signal or power line requiring protection; conducts surge current toward cathode during overvoltage events. |
| Cathode | Ground/reference terminal | Connected to system ground or low-impedance return path; establishes clamping reference and enables avalanche conduction under reverse bias. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Enables robust protection against repetitive load dump and inductive switching transients in 12 V/24 V automotive subsystems. |
| ±30 kV IEC 61000-4-2 ESD rating | Eliminates need for secondary board-level ESD mitigation in exposed connectors (e.g., USB-C, HDMI, CAN FD ports). |
| AEC-Q101 qualified (H3B class) | Validated for automotive under-hood and cabin applications including infotainment head units and ADAS camera links. |
| 161 pF capacitance at 0 V | Preserves signal integrity on high-speed digital interfaces up to 480 Mbps without requiring impedance tuning or layout compensation. |
| Low-profile DO-219AB package | Reduces PCB real estate by 30% vs. SMA packages while maintaining thermal performance via optimized copper pad layout. |
Applications
| Automotive Infotainment Display Interface | USB 2.0 Port Protection |
|---|---|
|
Use Scenario: Protecting LVDS or FPD-Link III video data lines between head unit and TFT display in vehicles exposed to ESD from user touch and harness coupling. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed at connector entry point to clamp fast transients before reaching serializer/deserializer ICs. Use Value: Prevents latch-up or permanent damage to display timing controllers rated for ≤100 V absolute max, leveraging 77.4 V clamping at 2.6 A. |
Use Scenario: Safeguarding D+ and D− lines of USB 2.0 host ports in industrial HMIs against ESD events during cable insertion/removal. IC Role / Device Role / Timing Role: Signal-line ESD suppressor with minimal parasitic capacitance, placed adjacent to USB connector to minimize stub length. Use Value: Maintains eye diagram integrity at 480 Mbps while delivering ±30 kV contact discharge immunity - exceeding USB-IF ESD test requirements. |
| Automotive Body Control Module (BCM) Power Input | Industrial CAN FD Node Protection |
|
Use Scenario: Suppressing load dump pulses (ISO 7637-2 Pulse 5a) on 12 V supply rail feeding microcontrollers and LIN transceivers in BCMs. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main VCC input, coordinated with upstream fuse and downstream LDOs. Use Value: Withstands 200 W surges for 1 ms duration and operates continuously across −65 °C to +175 °C ambient, matching BCM under-hood thermal profiles. |
Use Scenario: Protecting CAN FD transceiver pins (TXD/RXD/CANH/CANL) in gateways and ECU nodes subjected to ESD and bus fault transients. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional diode (used in back-to-back configuration) for common-mode surge suppression on differential pair. Use Value: 161 pF capacitance avoids CAN FD bit-rate distortion at 5 Mbps; AEC-Q101 qualification ensures reliability in vehicle network layers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ48A-E3/5A (Vishay) | Higher clamping voltage (80.3 V), larger SMA package (4.5 mm × 2.7 mm), 400 W peak power (10/1000 μs) | Better suited for higher-energy transients but incompatible with space-constrained layouts requiring DO-219AB footprint | Select SMAJ48A-E3/5A only when surge energy exceeds 200 W and PCB area allows SMA footprint. |
| TPD4E05U06DQAR (TI) | Quad-channel, 5.5 V VRWM, 0.8 pF per channel, 12 kV ESD rating, DFN-10 package | Designed for ultra-high-speed interfaces (USB 3.1, PCIe); not rated for 48 V systems or automotive AEC-Q101 | Choose TPD4E05U06DQAR for multi-line, low-capacitance protection below 6 V; avoid for 48 V rail or automotive qualification needs. |
Compared with SMAJ48A-E3/5A and TPD4E05U06DQAR, SMF48A-HE3-08 uniquely balances 48 V system compatibility, AEC-Q101 qualification, compact DO-219AB size, and 161 pF capacitance - making it optimal for cost-sensitive, space-constrained automotive and industrial ESD protection where moderate surge energy and high reliability are required.
Availability
SMF48A-HE3-08 is available at Aetrix Electronics and suitable for automotive infotainment interfaces, USB 2.0 port protection, and body control module power inputs requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant sourcing.
Supply support for SMF48A-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 leadership in power management, signal conditioning, and protection technologies.
The SMF series is part of Vishay's eSMP® family of surface-mount TVS diodes, engineered specifically for high-reliability ESD and surge protection in automotive, industrial, and communications systems demanding AEC-Q101 qualification and low-profile packaging.
FAQ
What is the maximum clamping voltage of the SMF48A-HE3-08 under standard test conditions?
The SMF48A-HE3-08 has a maximum clamping voltage (VC) of 77.4 V when subjected to a 10/1000 μs waveform at a peak pulse current (IPPM) of 2.6 A. This value is measured per IEC 61000-4-5 and ensures protected circuits remain within safe voltage limits during transient events. The SMF48A-HE3-08 maintains this clamping performance across its full operating temperature range of −65 °C to +175 °C.
Is the SMF48A-HE3-08 qualified to AEC-Q101, and what does that mean for automotive use?
Yes, the SMF48A-HE3-08 is AEC-Q101 qualified and rated for H3B-class ESD (human body model >8 kV), confirming its suitability for automotive applications including under-hood and cabin environments. This qualification validates robustness against mechanical stress, temperature cycling, and electrostatic discharge - essential for deployment in infotainment systems, body control modules, and ADAS sensors. The SMF48A-HE3-08 meets these requirements in its DO-219AB package without derating.
What is the capacitance of the SMF48A-HE3-08, and how does it affect high-speed signal lines?
The SMF48A-HE3-08 exhibits a typical capacitance of 161 pF at 0 V reverse bias and 1 MHz frequency. This value is optimized for interfaces such as USB 2.0 (480 Mbps), where excessive capacitance would distort edge rates and degrade eye diagrams. At 48 V VRWM, the SMF48A-HE3-08 delivers the lowest possible capacitance among 48 V-rated unidirectional TVS diodes in DO-219AB, enabling direct placement on signal traces without impedance discontinuity.
Can the SMF48A-HE3-08 be used in bidirectional configurations, and if so, how?
The SMF48A-HE3-08 is a unidirectional TVS diode and must be used with correct polarity - anode to line, cathode to ground. For bidirectional protection (e.g., on AC-coupled or differential lines), two SMF48A-HE3-08 devices can be connected in series opposing configuration (anode-to-anode or cathode-to-cathode), achieving symmetrical clamping. This method is documented in Vishay application notes for CAN FD and RS-485 protection, and the SMF48A-HE3-08's low leakage (0.1 μA) ensures minimal DC loading in such arrangements.
What are the soldering requirements for the SMF48A-HE3-08, and is it compatible with lead-free reflow processes?
The SMF48A-HE3-08 is fully compatible with lead-free reflow soldering, with a peak temperature limit of 260 °C per J-STD-020. Its DO-219AB package is rated MSL level 1 (unlimited floor life), eliminating bake requirements. The device supports both wave and reflow processes and is RoHS-compliant with tin-plated terminations. Layout guidelines recommend 1.3 mm × 1.3 mm copper pads per terminal and 2.9 mm center-to-center spacing - identical to SOD-123W footprint standards referenced in the SMF48A-HE3-08 datasheet.
SMF48A-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):
- 48V
- Voltage - Breakdown (Min):
- 53.3V
- Voltage - Clamping (Max) @ Ipp:
- 77.4V
- Current - Peak Pulse (10/1000µs):
- 2.6A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 161pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF48A-HE3-08 FAQ
1.How can I place an order for SMF48A-HE3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF48A-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 SMF48A-HE3-08 reliable?
The price and inventory of SMF48A-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 SMF48A-HE3-08 is usually 5 days.
3.What payment methods are accepted for SMF48A-HE3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF48A-HE3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF48A-HE3-08?
SMF48A-HE3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF48A-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 SMF48A-HE3-08?
For technical support, including SMF48A-HE3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF48A-HE3-08 requirements.
6.How does Aetrix verify that SMF48A-HE3-08 is sourced from the original manufacturer or authorized distributors?
All SMF48A-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 SMF48A-HE3-08 meets industry standards.
7.What is the process for return or replacement of SMF48A-HE3-08?
All SMF48A-HE3-08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF48A-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 SMF48A-HE3-08 part is unused and in its original packaging.
Return procedure for SMF48A-HE3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF48A-HE3-08 Tags
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