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Vishay General Semiconductor - Diodes Division SMF48A-HM3-18
- Part No.:
- SMF48A-HM3-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF48A-HM3-18.pdf
- Description:
- TVS DIODE 48VWM 77.4VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:9,874
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Product details
Overview
SMF48A-HM3-18 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 48 V standoff voltage (VRWM), 53.3–59 V reverse breakdown range (VBR), 77.4 V maximum clamping voltage at 2.6 A peak pulse current (IPPM), ±30 kV IEC 61000-4-2 ESD immunity, and 161 pF typical capacitance at 0 V - optimized for high-speed USB 2.0, HDMI, and industrial sensor interfaces.
For engineers reviewing the SMF48A-HM3-18 datasheet, SMF48A-HM3-18 pinout, SMF48A-HM3-18 application, or SMF48A-HM3-18 equivalent, key selection criteria include clamping performance under 10/1000 μs surge, low capacitance for signal integrity, AEC-Q101 qualification status, and compatibility with SOD-123W footprint layouts.
Technical Context
This device operates as a single-channel unidirectional TVS diode, leveraging silicon avalanche technology to clamp transients above its breakdown threshold while maintaining low leakage (<0.1 μA at VRWM) and fast response time (<1 ns). Its thermal resistance (RthJA = 180 K/W) and junction temperature rating (TJ = 175 °C) support reliable operation in automotive and industrial environments.
The SMF48A-HM3-18 is rated for 200 W peak pulse power (10/1000 μs), 1000 W (8/20 μs), and withstands 50 A non-repetitive forward surge current (8.3 ms half-sine). It meets IEC 61000-4-2 (±30 kV contact/air), IEC 61000-4-5 (line surge), and AEC-Q101 Class H3B (>8 kV HBM) requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 48 V - maximum continuous reverse operating voltage before clamping begins; ensures no interference with 48 V nominal bus or interface signals. |
| Breakdown Voltage (VBR) | 53.3–59 V at 1 mA - defines the onset of avalanche conduction; tight tolerance supports predictable clamping behavior across temperature. |
| Clamping Voltage (VC) | 77.4 V at 2.6 A (10/1000 μs) - limits downstream voltage during surge; critical for protecting 75 V-rated IC inputs. |
| Capacitance (CD) | 161 pF at 0 V, 1 MHz - low enough for USB 2.0 (480 Mbps) and CAN FD signal integrity without excessive rise-time degradation. |
| ESD Rating | ±30 kV contact / ±30 kV air per IEC 61000-4-2 - exceeds Level 4 immunity requirements for industrial and automotive control modules. |
| Package | DO-219AB (SOD-123W compatible) - low-profile (1.08 mm height), reflow-solderable, MSL level 1, suitable for dense PCB layouts. |
| AEC-Q101 Qualified | Yes - qualified for automotive applications including body electronics, infotainment, and ADAS sensor interfaces. |
Pinout & Package
SMF48A-HM3-18 uses the DO-219AB (SOD-123W-compatible) surface-mount package: 3.9 mm × 1.9 mm × 1.08 mm, cathode-marked end, single anode/cathode configuration. The package is wave- and reflow-solderable with peak temperature ≤260 °C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input side of protected line | Connected to signal or power line requiring ESD/surge protection; referenced to system ground via cathode path. |
| Cathode | Ground reference terminal | Must be connected to low-impedance system ground plane to enable effective clamping; determines unidirectional polarity. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Supports robust protection against repetitive EFT bursts and lightning-induced surges in industrial fieldbus nodes. |
| Low incremental surge resistance | Enables tighter clamping (VC − VBR ≈ 24 V), reducing stress on downstream logic-level receivers. |
| "Low Noise" fast-response technology | Sub-nanosecond turn-on minimizes overshoot during ESD events, preserving signal fidelity in high-speed serial links. |
| AEC-Q101 qualified variant | Validated for automotive underhood and cabin applications where reliability over -65 °C to +175 °C is mandatory. |
| SOD-123W footprint compatibility | Enables drop-in replacement or layout reuse with existing SOD-123F/SOD-123FL designs without board revision. |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting analog voltage outputs (0–5 V, 0–10 V) and digital I/O lines of pressure, temperature, and position sensors in factory automation systems. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed at connector entry point to shunt ESD and cable discharge transients to chassis ground. Use Value: 161 pF capacitance avoids loading sensor output impedance; 77.4 V clamping prevents damage to 12-bit ADC front-ends rated for ≤80 V absolute max. |
Use Scenario: Safeguarding LIN bus transceivers and switch matrix inputs in door module ECUs exposed to human-body ESD during vehicle assembly and service. IC Role / Device Role / Timing Role: Standoff-rated TVS on LIN data line (12 V nominal) to suppress contact discharges up to ±30 kV without false triggering. Use Value: 48 V VRWM exceeds LIN bus's 18 V max operating voltage; AEC-Q101 qualification ensures lifetime reliability under thermal cycling and vibration. |
| USB 2.0 Peripheral Port | 48 V DC Power Input Protection |
Use Scenario: ESD protection on D+ and D− lines of embedded USB host controllers in medical devices and test equipment. IC Role / Device Role / Timing Role: Low-capacitance TVS placed immediately after USB connector to minimize stub length and preserve 480 Mbps eye diagram integrity. Use Value: 161 pF at 0 V adds <1% jitter to full-speed USB eye; sub-ns response prevents ESD-induced packet corruption or PHY lockup. |
Use Scenario: Primary transient suppression on 48 V DC input rails of PoE-powered switches, LED drivers, and telecom power supplies. IC Role / Device Role / Timing Role: First-stage clamping device upstream of DC-DC converters to limit surges from load dump or inductive switching. Use Value: 200 W (10/1000 μs) rating handles sustained 2.6 A surges; 77.4 V clamping keeps downstream 100 V-rated MOSFETs within safe SOA limits. |
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 (Vishay) | Higher clamping voltage (80.5 V at 2.5 A), larger SMA (DO-214AC) package (4.5 mm × 2.7 mm), 200 W rating same. | Less suitable for space-constrained USB/HDMI layouts; better for higher-power 48 V rail protection where footprint is not limiting. | Select SMAJ48A-E3/5A when board area allows larger package and higher VC is acceptable for downstream component ratings. |
| TPD4E05U06DQAR (TI) | Quad-channel, 0.5 pF/channel ultra-low capacitance, 5 V VRWM, not 48 V rated; designed for high-speed data only. | Cannot replace SMF48A-HM3-18 on 48 V power or high-voltage signal lines; only valid for low-voltage differential pairs (e.g., USB 3.0, DisplayPort). | Choose TPD4E05U06DQAR only for multi-line, low-capacitance protection below 6 V; not a functional substitute for SMF48A-HM3-18's 48 V standoff capability. |
Compared with SMAJ48A-E3/5A and TPD4E05U06DQAR, SMF48A-HM3-18 uniquely balances 48 V standoff, 161 pF capacitance, DO-219AB compactness, and AEC-Q101 qualification - making it optimal for space-limited, high-reliability 48 V interface protection where both power and signal lines require coordinated surge handling.
Availability
SMF48A-HM3-18 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, USB 2.0 peripheral ports, and 48 V DC power input protection requiring stable component supply and long-term lifecycle assurance.
Supply support for SMF48A-HM3-18 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 diodes, MOSFETs, optoelectronics, and passive components with emphasis on reliability, precision, and automotive-grade qualification.
The SMF series targets high-speed, low-capacitance ESD protection for automotive, industrial, and computing interfaces - engineered to meet stringent IEC and AEC standards while enabling miniaturized, high-density PCB layouts.
FAQ
What is the standoff voltage and clamping performance of SMF48A-HM3-18?
The SMF48A-HM3-18 has a 48 V maximum standoff voltage (VRWM) and clamps to 77.4 V at 2.6 A peak pulse current (10/1000 μs waveform). This ensures protection of downstream components rated for ≤80 V absolute maximum while maintaining low leakage (<0.1 μA) during normal operation. Its 53.3–59 V breakdown range provides consistent turn-on behavior across temperature and unit variation.
Is SMF48A-HM3-18 qualified for automotive use?
Yes, SMF48A-HM3-18 is AEC-Q101 qualified and rated for operation from −65 °C to +175 °C. It meets human body model (HBM) Class H3B (>8 kV) and IEC 61000-4-2 (±30 kV contact/air) requirements - making it suitable for automotive body electronics, infotainment interfaces, and ADAS sensor signal conditioning where reliability under thermal cycling and ESD stress is critical. The SMF48A-HM3-18 part number includes the "H" suffix denoting AEC-Q101 qualification.
What package does SMF48A-HM3-18 use, and is it compatible with standard SOD-123 footprints?
SMF48A-HM3-18 uses the DO-219AB package (also known as SOD-123W), measuring 3.9 mm × 1.9 mm × 1.08 mm with cathode marking. It is mechanically and solder-reflow compatible with SOD-123F and SOD-123FL land patterns per Vishay's documentation. The footprint recommendation specifies 1.3 mm × 1.3 mm pads with 2.9 mm center-to-center spacing - enabling layout reuse without redesign in many existing SOD-123-based systems.
How does the 161 pF capacitance of SMF48A-HM3-18 affect high-speed signal integrity?
The 161 pF typical capacitance (measured at 0 V, 1 MHz) of SMF48A-HM3-18 is optimized for USB 2.0 (480 Mbps) and industrial analog/digital interfaces - adding minimal loading to 50 Ω or 100 Ω transmission lines. At 480 Mbps, this capacitance introduces <1% rise-time degradation and preserves eye opening; it is not recommended for USB 3.0 or PCIe, where sub-1 pF devices are required. The SMF48A-HM3-18 achieves this balance without sacrificing clamping robustness.
Can SMF48A-HM3-18 be used for bidirectional protection?
No, SMF48A-HM3-18 is a unidirectional TVS diode intended for circuits with a defined ground reference and positive-only transients. Its electrical characteristics - including 48 V VRWM and asymmetrical breakdown behavior - assume cathode tied to ground and anode connected to the protected line. For bidirectional protection (e.g., AC-coupled lines or RS-485), a dedicated bidirectional part such as SMBJ48CA or a dual-diode array must be selected instead of SMF48A-HM3-18.
SMF48A-HM3-18 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-HM3-18 FAQ
1.How can I place an order for SMF48A-HM3-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF48A-HM3-18 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-HM3-18 reliable?
The price and inventory of SMF48A-HM3-18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF48A-HM3-18 is usually 5 days.
3.What payment methods are accepted for SMF48A-HM3-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF48A-HM3-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF48A-HM3-18?
SMF48A-HM3-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF48A-HM3-18 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-HM3-18?
For technical support, including SMF48A-HM3-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF48A-HM3-18 requirements.
6.How does Aetrix verify that SMF48A-HM3-18 is sourced from the original manufacturer or authorized distributors?
All SMF48A-HM3-18 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-HM3-18 meets industry standards.
7.What is the process for return or replacement of SMF48A-HM3-18?
All SMF48A-HM3-18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF48A-HM3-18, 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-HM3-18 part is unused and in its original packaging.
Return procedure for SMF48A-HM3-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF48A-HM3-18 Tags
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