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Vishay SMF48A-HE3_A18
- Part No.:
- SMF48A-HE3_A18
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF48A-HE3_A18.pdf
- Description:
- ESD PROTECTION DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,554
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Product details
Overview
SMF48A-HE3_A18 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. It features a 48 V standoff voltage (VRWM), 53.3–59 V breakdown range (VBR), 77.4 V maximum clamping voltage at 2.6 A IPPM, ±30 kV IEC 61000-4-2 ESD immunity, and 161 pF capacitance at 0 V - optimized for USB 2.0, HDMI, and industrial sensor interfaces.
For engineers reviewing the SMF48A-HE3_A18 datasheet, SMF48A-HE3_A18 pinout, SMF48A-HE3_A18 application, or SMF48A-HE3_A18 equivalent, this device is selected for robust electrostatic discharge protection in space-constrained, high-reliability PCB layouts where low clamping voltage, fast response, and AEC-Q101 qualification are critical design requirements.
Technical Context
This diode operates as a unidirectional TVS element with avalanche breakdown behavior, providing clamping action during transients while maintaining low leakage (<0.1 µA at VRWM). Its SOD-123W-compatible DO-219AB package enables automated placement and supports reflow soldering up to 260 °C peak temperature.
The device meets IEC 61000-4-2 (±30 kV contact/air), IEC 61000-4-5 (1000 W, 8/20 µs), and AEC-Q101 Class H3B (>8 kV HBM) standards. Thermal resistance is 180 K/W when mounted on 3 mm × 3 mm Cu pads, supporting continuous operation from –65 °C to +175 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 48 V - maximum continuous reverse operating voltage before clamping begins |
| Breakdown Voltage (VBR) | 53.3–59 V at 1 mA - defines precise avalanche initiation threshold for predictable clamping onset |
| Clamping Voltage (VC) | 77.4 V at 2.6 A (10/1000 µs) - limits downstream IC voltage stress during surge events |
| Capacitance (CD) | 161 pF at 0 V, 1 MHz - low enough for USB 2.0 (480 Mbps) signal integrity preservation |
| ESD Rating | ±30 kV contact & air (IEC 61000-4-2) - exceeds automotive and industrial ESD immunity requirements |
| Peak Pulse Power | 200 W (10/1000 µs), 1000 W (8/20 µs) - handles both fast ESD and slower surge waveforms |
| Operating Temp Range | –65 °C to +175 °C - supports under-hood automotive and harsh-environment industrial use |
Pinout & Package
SMF48A-HE3_A18 uses the DO-219AB (SMF) package: low-profile (1.08 mm height), 3.9 mm × 1.9 mm footprint, cathode-bar marked, compatible with SOD-123W layout. Mold compound is UL 94 V-0 rated; MSL Level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side | Connected to protected signal line; conducts during negative transients or forward bias |
| Cathode | Ground reference | Connected to system ground or low-impedance return path; defines unidirectional clamping polarity |
Key Features
| Feature | Design Value |
|---|---|
| Low clamping voltage | 77.4 V at 2.6 A ensures protected ICs remain below absolute maximum ratings during surges |
| "Low Noise" fast response | Sub-nanosecond turn-on minimizes voltage overshoot before clamping engages |
| AEC-Q101 qualified | Validated for automotive applications including infotainment and body electronics |
| Wave & reflow solderable | Compatible with standard SMT processes up to 260 °C peak, enabling high-yield manufacturing |
| Low profile DO-219AB | 1.08 mm height allows use in ultra-thin consumer and portable designs |
Applications
| USB 2.0 Interface Protection | HDMI Signal Line Protection |
|---|---|
Use Scenario: Protecting D+ and D– lines of USB 2.0 ports against ESD events in docking stations and peripherals. IC Role / Device Role: Unidirectional TVS diode placed between signal line and ground, clamping transients before they reach the USB transceiver. Use Value: 161 pF capacitance avoids signal distortion at 480 Mbps; 77.4 V clamping prevents damage to 5 V-tolerant PHYs. | Use Scenario: Safeguarding TMDS clock and data channels in HDMI 1.4 receivers against contact ESD in AV receivers and monitors. IC Role / Device Role: Point-of-entry ESD suppressor on each differential pair, referenced to chassis ground. Use Value: ±30 kV IEC 61000-4-2 rating ensures compliance with HDMI compliance test plans; DO-219AB footprint fits tight channel spacing. |
| Automotive Sensor Interface | Industrial CAN Bus Node |
Use Scenario: Protecting analog outputs (e.g., 4–20 mA current loop sensors) in engine control modules exposed to under-hood ESD. IC Role / Device Role: Reverse-biased TVS on signal output line, shunting transients to ground without affecting DC accuracy. Use Value: –65 °C to +175 °C operating range matches under-hood thermal profiles; AEC-Q101 qualification confirms reliability. | Use Scenario: Adding secondary ESD protection on CAN_H/CAN_L lines downstream of primary common-mode choke in industrial gateways. IC Role / Device Role: Unidirectional clamp per line, used in conjunction with bidirectional TVS for full-spectrum surge immunity. Use Value: 48 V VRWM aligns with 5 V CAN transceiver supply rails; 200 W pulse rating handles repetitive noise bursts in factory environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ48A-E3/5A | Higher clamping voltage (80.5 V), larger SMA (DO-214AC) package (4.5 mm × 2.7 mm) | Less suitable for fine-pitch USB/HDMI layouts due to 2.3× larger footprint | Choose when higher surge margin is needed and board space permits larger package |
| TPD2E001DRYR | Bi-directional, lower capacitance (11 pF), integrated dual-channel, but only 12 V VRWM | Designed for low-voltage logic (I²C, GPIO); not rated for 48 V line protection | Prefer for sub-15 V digital interfaces requiring ultra-low capacitance; not a direct replacement for SMF48A-HE3_A18 |
Compared with SMAJ48A-E3/5A and TPD2E001DRYR, SMF48A-HE3_A18 delivers optimal balance of 48 V standoff, compact DO-219AB size, and 77.4 V clamping - making it the preferred choice for space-limited, medium-voltage ESD protection where AEC-Q101 validation and low-profile mounting are mandatory.
Availability
SMF48A-HE3_A18 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, HDMI signal line safeguarding, and automotive sensor interface applications requiring stable component supply across production lifecycles.
Supply support for SMF48A-HE3_A18 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 and automotive-grade qualification.
The SMF series targets high-speed data line protection in automotive, industrial, and consumer electronics, engineered to meet stringent ESD, surge, and thermal endurance requirements in miniaturized SMT packages.
FAQ
What is the clamping voltage of SMF48A-HE3_A18 at its rated peak pulse current?
The SMF48A-HE3_A18 has a maximum clamping voltage (VC) of 77.4 V when subjected to a 10/1000 µs waveform at its rated peak pulse current of 2.6 A. This value is measured under standardized transient conditions and ensures protected circuitry remains within safe voltage limits during ESD or surge events. The clamping performance is guaranteed across the full operating temperature range.
Is SMF48A-HE3_A18 qualified for automotive applications?
Yes, SMF48A-HE3_A18 is AEC-Q101 qualified and rated for human body model (HBM) ESD >8 kV. It is specifically validated for automotive use cases including infotainment interfaces, body control modules, and sensor signal conditioning. Its –65 °C to +175 °C operating range and DO-219AB package robustness support under-hood and cabin deployment.
What is the capacitance of SMF48A-HE3_A18 and how does it affect high-speed signal lines?
SMF48A-HE3_A18 exhibits 161 pF typical capacitance at 0 V and 1 MHz. This value is low enough to avoid significant signal degradation on USB 2.0 (480 Mbps) and HDMI 1.4 (up to 3.4 Gbps) differential pairs when placed with proper layout practices. Capacitance increases slightly at lower reverse voltages but remains within acceptable bounds for these protocols.
Does SMF48A-HE3_A18 have polarity markings, and how is it oriented on the PCB?
Yes, SMF48A-HE3_A18 features a cathode bar marking on the package top surface, aligned with Pin 2 (cathode terminal). When mounted, the cathode must connect to system ground or the lowest potential reference point. The DO-219AB orientation in tape follows standard carrier direction with cathode toward the sprocket hole side, as shown in Vishay's orientation diagram (Doc. S8-V-3717.02).
Can SMF48A-HE3_A18 be used in bidirectional signal protection applications?
No - SMF48A-HE3_A18 is a unidirectional TVS diode, designed for clamping only in one polarity (anode-to-cathode). For bidirectional protection (e.g., RS-485, CAN), a separate bidirectional device or back-to-back configuration is required. Its electrical characteristics, including breakdown and clamping, are specified only for reverse-biased operation relative to the cathode.
SMF48A-HE3_A18 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):
- 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 (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF48A-HE3_A18 FAQ
1.How can I place an order for SMF48A-HE3_A18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF48A-HE3_A18 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_A18 reliable?
The price and inventory of SMF48A-HE3_A18 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_A18 is usually 5 days.
3.What payment methods are accepted for SMF48A-HE3_A18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF48A-HE3_A18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF48A-HE3_A18?
SMF48A-HE3_A18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF48A-HE3_A18 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_A18?
For technical support, including SMF48A-HE3_A18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF48A-HE3_A18 requirements.
6.How does Aetrix verify that SMF48A-HE3_A18 is sourced from the original manufacturer or authorized distributors?
All SMF48A-HE3_A18 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_A18 meets industry standards.
7.What is the process for return or replacement of SMF48A-HE3_A18?
All SMF48A-HE3_A18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF48A-HE3_A18, 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_A18 part is unused and in its original packaging.
Return procedure for SMF48A-HE3_A18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF48A-HE3_A18 Tags
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