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Vishay General Semiconductor - Diodes Division SMF48A-E3-08
- Part No.:
- SMF48A-E3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF48A-E3-08.pdf
- Description:
- TVS DIODE 48VWM 77.4VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:14,469
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Product details
Overview
SMF48A-E3-08 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. It features a 48 V stand-off 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 200 W peak pulse power (10/1000 μs). It is used in USB 2.0, HDMI, and industrial sensor interfaces requiring robust electrostatic discharge protection.
For engineers reviewing the SMF48A-E3-08 datasheet, SMF48A-E3-08 pinout, SMF48A-E3-08 application, or SMF48A-E3-08 equivalent, this device delivers low-capacitance (161 pF at 0 V, 1 MHz), AEC-Q101 qualified reliability, and low incremental surge resistance for precise clamping in space-constrained PCB layouts.
Technical Context
The SMF48A-E3-08 operates as a unidirectional TVS diode with avalanche breakdown behavior, optimized for fast response to ESD transients (sub-nanosecond rise time per IEC 61000-4-2). Its low clamping ratio (VC/VBR ≈ 1.37) and 161 pF junction capacitance support signal integrity in 48 V-rated DC bias applications such as automotive body control modules and industrial I/O ports.
It is rated for continuous operation from –65 °C to +175 °C, with thermal resistance RthJA = 180 K/W on standard epoxy-glass PCBs, and complies with AEC-Q101 stress testing including HBM >8 kV - confirming suitability for under-hood and harsh-environment deployments where thermal cycling and long-term reliability are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 48 V - Maximum continuous reverse voltage before significant leakage; sets operating margin for 48 V supply rails. |
| Reverse Breakdown (VBR) | 53.3–59 V at 1 mA - Defined avalanche onset range; ensures predictable turn-on during overvoltage events. |
| Clamping Voltage (VC) | 77.4 V at 2.6 A (10/1000 μs) - Peak voltage seen by protected circuit during worst-case surge; limits downstream IC stress. |
| Junction Capacitance (CD) | 161 pF at 0 V, 1 MHz - Low enough for USB 2.0 (480 Mbps) and CAN FD signal paths without excessive signal attenuation. |
| ESD Immunity | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - Meets highest industrial and automotive ESD robustness requirements. |
| Peak Pulse Power | 200 W (10/1000 μs) - Sustains short-duration surges common in board-level ESD and lightning-induced coupling. |
| Operating Temperature | –65 °C to +175 °C - Enables use in engine control units, battery management systems, and outdoor industrial enclosures. |
Pinout & Package
SMF48A-E3-08 uses the DO-219AB (SMF) package: low-profile (1.08 mm max height), SOD-123W-compatible outline, molded in UL 94 V-0 compound, MSL level 1, and reflow-solderable with peak temperature ≤260 °C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input side of protection path | Connected to signal line or power rail needing ESD suppression; referenced to system ground via cathode. |
| Cathode | Ground reference terminal | Must be tied directly to low-impedance system ground plane to ensure effective clamping and minimal ground bounce. |
Key Features
| Feature | Design Value |
|---|---|
| Low-clamp architecture | 77.4 V VC at 2.6 A enables tighter voltage margins for 48 V logic and analog front-ends. |
| "Low Noise" fast-response technology | Sub-nanosecond response per IEC 61000-4-2 ensures protection activates before sensitive ICs experience overstress. |
| AEC-Q101 qualification | Validated for automotive under-hood use including temperature cycling, humidity, and mechanical shock tests. |
| SOD-123W/SOD-123F compatibility | Enables drop-in replacement in existing layouts using industry-standard footprint and solder stencil design. |
| 161 pF capacitance at 0 V | Preserves signal rise/fall times in 480 Mbps USB 2.0 and 125 Mbps CAN FD interfaces without added jitter. |
Applications
| Automotive Body Control Module | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting LIN bus and switch inputs in door module ECUs exposed to cable discharge events. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between LIN signal line and chassis ground. Use Value: Clamps transients to ≤77.4 V while maintaining <0.1 μA leakage at 48 V supply, preventing microcontroller reset or latch-up. | Use Scenario: Shielding 4–20 mA current loop inputs in PLC analog input cards from field wiring ESD. IC Role / Device Role / Timing Role: Standoff-rated transient suppressor across input terminals, referenced to isolated signal ground. Use Value: Withstands ±30 kV contact discharge without degradation, preserving measurement accuracy over 10+ year field life. |
| USB 2.0 Port Protection | 48 V DC Power Rail Clamp |
Use Scenario: ESD protection on D+ and D− lines of embedded USB host ports in medical diagnostic equipment. IC Role / Device Role / Timing Role: Low-capacitance TVS pair (one per line) with cathodes tied to system ground. Use Value: 161 pF capacitance avoids signal integrity loss at 480 Mbps, meeting USB-IF eye diagram compliance. | Use Scenario: Overvoltage clamp on 48 V PoE-powered subsystems (e.g., IP cameras, access controllers). IC Role / Device Role / Timing Role: Primary crowbar device across 48 V input and ground, upstream of DC/DC converter. Use Value: 200 W pulse rating handles inrush surges and induced transients without thermal runaway or parametric shift. |
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 (80.5 V), larger SMA (DO-214AC) package (2.4 mm height), 200 W rating same. | Less suitable for ultra-thin designs; higher thermal resistance (RthJA ≈ 200 K/W) reduces surge margin in dense layouts. | Choose when legacy SMA footprint exists and height constraint is relaxed. |
| TPSMD48CA | Bidirectional configuration (±48 V), 77 V clamping, 170 pF capacitance, same DO-219AB package. | Required only where symmetrical transients (e.g., AC-coupled lines) demand dual-polarity clamping. | Choose only if bidirectional protection is mandated by interface standard (e.g., RS-485 full-duplex). |
Compared with SMAJ48A-E3/57T and TPSMD48CA, SMF48A-E3-08 offers the lowest profile and best thermal performance in its class, making it optimal for next-gen compact 48 V systems where board space and thermal headroom are constrained.
Availability
SMF48A-E3-08 is available at Aetrix Electronics and suitable for automotive body electronics, industrial I/O modules, USB 2.0 peripheral protection, and 48 V DC power rail clamping requiring stable component supply and long-term lifecycle assurance.
Supply support for SMF48A-E3-08 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 Semiconductors is a global leader in discrete semiconductors, specializing in high-reliability diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.
The SMF series targets high-density ESD protection in automotive and industrial applications, emphasizing low profile, AEC-Q101 qualification, and precise clamping for 12–58 V systems.
FAQ
What is the maximum clamping voltage of the SMF48A-E3-08 under standard test conditions?
The SMF48A-E3-08 has a maximum clamping voltage (VC) of 77.4 V when subjected to a 10/1000 μs waveform at 2.6 A peak pulse current. This value is measured per IEC 61000-4-5 and defines the upper voltage limit imposed on protected circuits during surge events. The clamping performance is guaranteed across the full operating temperature range (–65 °C to +175 °C), and SMF48A-E3-08 maintains this specification without derating in typical PCB mounting configurations.
Is SMF48A-E3-08 qualified for automotive applications?
Yes, SMF48A-E3-08 is AEC-Q101 qualified and tested for human body model (HBM) ESD >8 kV, making it suitable for automotive applications including body control modules, infotainment interfaces, and sensor nodes. It meets the full stress test suite including temperature cycling, mechanical shock, and humidity resistance. SMF48A-E3-08 is explicitly listed in Vishay's AEC-Q101 qualified product matrix and carries the "HE3" variant designation for automotive-grade versions - though the -E3-08 suffix denotes RoHS-compliant, lead-free termination with standard qualification.
What is the junction capacitance of SMF48A-E3-08 and how does it affect high-speed signal lines?
The SMF48A-E3-08 exhibits a typical junction capacitance of 161 pF at 0 V and 1 MHz. This value decreases significantly with applied reverse bias - e.g., to ~40 pF at 48 V VR - minimizing loading on 48 V-biased high-speed lines. For USB 2.0 (480 Mbps), this capacitance preserves signal integrity without violating eye diagram masks, and SMF48A-E3-08 is routinely deployed on D+/D− traces in automotive telematics units where layout constraints prohibit larger-footprint alternatives.
Can SMF48A-E3-08 be used in bidirectional signal protection applications?
No - SMF48A-E3-08 is a unidirectional TVS diode, intended for DC-biased lines where the cathode is referenced to ground and the anode connects to the protected signal. It does not provide symmetrical clamping for AC-coupled or bipolar signals. For bidirectional protection (e.g., RS-485, CAN), a dedicated bidirectional part like TPSMD48CA must be selected. Using SMF48A-E3-08 in such roles risks forward conduction during negative transients, potentially damaging downstream circuitry or degrading protection efficacy.
What is the recommended PCB footprint and soldering profile for SMF48A-E3-08?
The SMF48A-E3-08 uses the DO-219AB (SMF) package with standardized SOD-123W-compatible dimensions: 3.9 mm × 1.9 mm body, 1.08 mm max height, and cathode band marking. Vishay recommends a footprint with 1.3 mm pad length, 1.4 mm pad width, and 2.9 mm center-to-center spacing. Reflow soldering must follow J-STD-020 MSL level 1 guidelines, with peak temperature ≤260 °C and time above liquidus ≤60 seconds. SMF48A-E3-08 is fully compatible with standard wave and reflow processes.
SMF48A-E3-08 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:
- General Purpose
- Capacitance @ Frequency:
- 161pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF48A-E3-08 FAQ
1.How can I place an order for SMF48A-E3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF48A-E3-08 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-E3-08 reliable?
The price and inventory of SMF48A-E3-08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF48A-E3-08 is usually 5 days.
3.What payment methods are accepted for SMF48A-E3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF48A-E3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF48A-E3-08?
SMF48A-E3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF48A-E3-08 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-E3-08?
For technical support, including SMF48A-E3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF48A-E3-08 requirements.
6.How does Aetrix verify that SMF48A-E3-08 is sourced from the original manufacturer or authorized distributors?
All SMF48A-E3-08 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-E3-08 meets industry standards.
7.What is the process for return or replacement of SMF48A-E3-08?
All SMF48A-E3-08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF48A-E3-08, 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-E3-08 part is unused and in its original packaging.
Return procedure for SMF48A-E3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF48A-E3-08 Tags
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