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Vishay SMF48A-HM3_A18
- Part No.:
- SMF48A-HM3_A18
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF48A-HM3_A18.pdf
- Description:
- ESD PROTECTION DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,229
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Product details
Overview
SMF48A-HM3_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 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 AEC-Q101 qualified and used in automotive infotainment interfaces.
For engineers reviewing the SMF48A-HM3_A18 datasheet, SMF48A-HM3_A18 pinout, SMF48A-HM3_A18 application, or SMF48A-HM3_A18 equivalent, key selection criteria include clamping voltage margin vs. IC I/O rail tolerance, capacitance impact on signal integrity (161 pF at 0 V), thermal resistance (180 K/W), and SOD-123W-compatible footprint compatibility for board-level ESD hardening.
Technical Context
This device operates as a unidirectional TVS diode with avalanche breakdown behavior, optimized for low clamping voltage under fast transients. Its 161 pF junction capacitance at 0 V and 0.1 μA max reverse leakage at VRWM make it suitable for DC-coupled 48 V supply rails and medium-speed serial buses where capacitive loading must be constrained.
The SMF48A-HM3_A18 uses "Low Noise" technology for sub-nanosecond response time and achieves ±30 kV contact/air discharge per IEC 61000-4-2. Its DO-219AB package supports wave and reflow soldering, with MSL level 1 rating and peak temperature tolerance up to 260 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 48 V - Maximum continuous reverse voltage before conduction; sets operating margin above nominal 48 V system rail. |
| Clamping Voltage (VC) | 77.4 V at IPPM = 2.6 A - Peak voltage seen by protected circuit during 10/1000 μs surge; defines safe overvoltage ceiling. |
| Junction Capacitance | 161 pF at VR = 0 V, f = 1 MHz - Limits bandwidth degradation on signal lines; acceptable for CAN FD, LIN, and 48 V sensor interfaces. |
| ESD Immunity | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - Validates robustness against human-body and proximity discharge events. |
| Peak Pulse Power | 200 W (10/1000 μs) - Sustains short-duration surges without failure; sufficient for ISO 16750-2 load dump edge cases. |
| Thermal Resistance | 180 K/W (RthJA, 3 mm × 3 mm Cu pads) - Determines steady-state power dissipation limit; requires adequate PCB copper area for reliability. |
| AEC-Q101 Qualified | Yes - Confirms suitability for automotive applications including engine control, body electronics, and ADAS subsystems. |
Pinout & Package
SMF48A-HM3_A18 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 | Input/Line side (cathode-marked end is cathode) | Connected to protected line; conducts during negative transients when used in unidirectional configuration. |
| Cathode | Ground/reference side (bar-marked terminal) | Connected to system ground or low-impedance return path; defines clamping reference point and polarity. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Enables reliable suppression of repetitive low-energy surges in automotive and industrial environments without derating. |
| ±30 kV ESD immunity (IEC 61000-4-2) | Meets stringent ESD robustness requirements for exposed connectors and touch-sensitive vehicle interfaces. |
| 161 pF typical capacitance at 0 V | Minimizes signal distortion on 48 V power distribution networks and medium-speed communication links. |
| Low incremental surge resistance | Ensures tight clamping performance across varying surge amplitudes, improving protection consistency. |
| AEC-Q101 qualification | Validates long-term reliability under temperature cycling, humidity, and mechanical stress in automotive under-hood use. |
Applications
| Automotive Infotainment Display Interface | 48 V Camera Power Line Protection |
|---|---|
Use Scenario: Protecting LVDS or FPD-Link III video data lines between head unit and central display in vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed inline on each differential pair to clamp ESD-induced voltage spikes. Use Value: Prevents latch-up or damage to serializer/deserializer ICs while maintaining < 200 pF total line capacitance for signal integrity. | Use Scenario: Safeguarding 48 V power input to rear-view or surround-view cameras exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Primary transient suppressor on camera module's main power rail, upstream of DC/DC converter. Use Value: Clamps transients to ≤77.4 V, ensuring downstream regulator remains within absolute maximum ratings during ISO 16750-2 pulses. |
| Body Control Module LIN Bus | ADAS Radar Sensor Supply Rail |
Use Scenario: ESD protection on LIN bus pins of door modules, seat controllers, and lighting ECUs. IC Role / Device Role / Timing Role: Unidirectional clamp tied between LIN line and chassis ground, leveraging low leakage (< 0.1 μA) to avoid bus bias disruption. Use Value: Maintains LIN physical layer compliance while surviving repeated ±30 kV contact discharges during service and assembly. | Use Scenario: Transient suppression on 48 V supply to 77 GHz radar transceivers in front bumper modules. IC Role / Device Role / Timing Role: First-line defense against coupled surges from adjacent high-power systems (e.g., electric power steering). Use Value: Limits voltage overshoot to < 80 V during 10/1000 μs surges, preventing gate oxide stress in RF power amplifiers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ48A-E3/57T | Higher clamping voltage (80 V), larger SMA package (DO-214AC), 200 W rating same. | Less suitable for space-constrained automotive modules due to 4.5 mm × 2.7 mm footprint. | Choose SMAJ48A-E3/57T only if board layout allows larger package and higher clamping margin is acceptable. |
| TPSMF48A | Same DO-219AB package, identical electrical specs, but offered by STMicroelectronics with different AEC-Q101 test report scope. | No functional difference; validated for same automotive subsystems including infotainment and ADAS. | TPSMF48A serves as a second-source option with identical form, fit, and function-no redesign needed. |
Compared with SMF48A-HM3_A18, SMAJ48A-E3/57T trades compactness for slightly relaxed clamping, while TPSMF48A provides full drop-in redundancy with matching electrical behavior and automotive qualification-making it ideal for dual-sourcing strategies without layout changes.
Availability
SMF48A-HM3_A18 is available at Aetrix Electronics and suitable for automotive infotainment interfaces, 48 V camera power lines, and LIN bus protection requiring stable component supply across multi-year production cycles.
Supply support for SMF48A-HM3_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 Intertechnology is a global manufacturer of discrete semiconductors and passive components, specializing in high-reliability solutions for automotive, industrial, and computing markets.
The SMF series targets automotive-grade transient voltage suppression, engineered specifically for ESD and surge protection in next-generation 48 V architectures and high-speed serial interfaces.
FAQ
What is the clamping voltage specification for SMF48A-HM3_A18?
The SMF48A-HM3_A18 has a maximum reverse clamping voltage (VC) of 77.4 V at a peak pulse current (IPPM) of 2.6 A using a 10/1000 μs waveform. This value is measured under standardized surge conditions and defines the upper voltage limit imposed on protected circuits during transient events. The SMF48A-HM3_A18 maintains this clamping performance consistently across its qualified temperature range.
Is SMF48A-HM3_A18 suitable for automotive applications?
Yes, SMF48A-HM3_A18 is AEC-Q101 qualified and rated for operation from −65 °C to +175 °C, making it suitable for under-hood and cabin-mounted automotive systems. Its ±30 kV ESD immunity, 200 W surge capability, and DO-219AB package robustness align with requirements for infotainment, ADAS sensors, and body electronics. The SMF48A-HM3_A18 meets automotive reliability standards without derating.
What is the junction capacitance of SMF48A-HM3_A18 and how does it affect signal lines?
The SMF48A-HM3_A18 exhibits 161 pF typical junction capacitance at 0 V and 1 MHz. This value directly impacts high-frequency signal integrity: lower capacitance preserves bandwidth and reduces rise-time degradation. At 161 pF, the SMF48A-HM3_A18 is appropriate for 48 V power monitoring, LIN, and medium-speed digital buses-but not recommended for >100 Mbps differential signaling without modeling.
Does SMF48A-HM3_A18 have a unidirectional or bidirectional configuration?
The SMF48A-HM3_A18 is a unidirectional TVS diode, indicated by its single reverse standoff voltage (VRWM = 48 V) and absence of symmetric breakdown characteristics. It protects against positive transients on the cathode side relative to anode, requiring correct orientation in-circuit. This configuration suits DC-biased lines like 48 V supplies and LIN bus, where polarity is fixed. The SMF48A-HM3_A18 is not intended for AC-coupled or bidirectional data lines without additional design considerations.
What package type does SMF48A-HM3_A18 use and is it compatible with standard pick-and-place equipment?
SMF48A-HM3_A18 uses the DO-219AB (SMF) package - a low-profile, surface-mount outline measuring 3.9 mm × 1.9 mm × 1.08 mm. It is fully compatible with standard SMD assembly processes, including wave and reflow soldering (peak temp ≤ 260 °C), and conforms to MSL level 1. Tape-and-reel packaging (8 mm width, 3K per 7″ reel) ensures compatibility with automated placement systems. The SMF48A-HM3_A18's footprint matches SOD-123W, enabling reuse of existing stencil and placement tooling.
SMF48A-HM3_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-HM3_A18 FAQ
1.How can I place an order for SMF48A-HM3_A18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF48A-HM3_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-HM3_A18 reliable?
The price and inventory of SMF48A-HM3_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-HM3_A18 is usually 5 days.
3.What payment methods are accepted for SMF48A-HM3_A18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF48A-HM3_A18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF48A-HM3_A18?
SMF48A-HM3_A18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF48A-HM3_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-HM3_A18?
For technical support, including SMF48A-HM3_A18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF48A-HM3_A18 requirements.
6.How does Aetrix verify that SMF48A-HM3_A18 is sourced from the original manufacturer or authorized distributors?
All SMF48A-HM3_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-HM3_A18 meets industry standards.
7.What is the process for return or replacement of SMF48A-HM3_A18?
All SMF48A-HM3_A18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF48A-HM3_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-HM3_A18 part is unused and in its original packaging.
Return procedure for SMF48A-HM3_A18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF48A-HM3_A18 Tags
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