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Vishay General Semiconductor - Diodes Division SMF48A-M3-08
- Part No.:
- SMF48A-M3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF48A-M3-08.pdf
- Description:
- TVS DIODE 48VWM 77.4VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:26,336
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Product details
Overview
SMF48A-M3-08 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 (10/1000 μs), ±30 kV IEC 61000-4-2 ESD immunity, and 200 W peak pulse power rating - enabling robust protection for USB 2.0, HDMI, and automotive infotainment interfaces.
For engineers reviewing the SMF48A-M3-08 datasheet, SMF48A-M3-08 pinout, SMF48A-M3-08 application, or SMF48A-M3-08 equivalent, key selection criteria include clamping voltage margin vs. IC I/O rail tolerance, capacitance (161 pF at 0 V, 1 MHz), AEC-Q101 qualification status, and SOD-123W-compatible footprint compatibility with automated assembly processes.
Technical Context
This device operates as a single-channel unidirectional TVS diode, leveraging silicon avalanche breakdown to clamp transients above its reverse standoff voltage. Its low incremental surge resistance ensures rapid response (<1 ns rise time per IEC 61000-4-2) and minimal voltage overshoot during ESD events.
The SMF48A-M3-08 is rated for operation from –65 °C to +175 °C, with thermal resistance RthJA = 180 K/W on standard epoxy-glass PCBs and junction temperature limit of 175 °C - supporting under-hood automotive and industrial environments 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 operating voltage before conduction begins; sets minimum system rail margin for safe operation. |
| Clamping Voltage (VC) | 77.4 V at IPPM = 2.6 A (10/1000 μs) - peak voltage seen by protected circuit during worst-case surge; must stay below IC absolute maximum ratings. |
| Capacitance (CD) | 161 pF at 0 V, 1 MHz - directly impacts signal integrity on high-speed lines; suitable for ≤100 Mbps interfaces but not USB 3.0 or PCIe. |
| ESD Rating | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - exceeds Level 4 immunity requirements for consumer and automotive electronics. |
| Peak Pulse Power | 200 W (10/1000 μs), 1000 W (8/20 μs IEC 61000-4-5) - defines energy-handling capability for lightning-induced surges and system-level transients. |
| Package | DO-219AB (SOD-123W-compatible) - 3.9 mm × 1.9 mm × 1.08 mm low-profile outline optimized for space-constrained PCB layouts and reflow soldering. |
| AEC-Q101 Qualified | Yes - qualified per AEC-Q101 Rev D for automotive-grade reliability including HBM >8 kV, ensuring suitability for passenger compartment modules. |
Pinout & Package
SMF48A-M3-08 uses the DO-219AB (SOD-123W-equivalent) surface-mount package: cathode-marked anode-cathode configuration in a single-row, two-terminal plastic case. Dimensions: 3.9 mm length × 1.9 mm width × 1.08 mm height. Compatible with standard 8 mm tape-and-reel packaging (M3-08 = 3K/reel, 7″).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Input/Line side connection | Connected to signal or power line requiring protection; conducts during forward-biased ESD events (rare in unidirectional use). |
| Cathode (Pin 2) | Ground reference terminal | Connected to system ground plane; provides low-impedance path for transient current during reverse-biased clamping events. |
Key Features
| Feature | Design Value |
|---|---|
| Low-clamp architecture | 77.4 V VC at 2.6 A enables protection of 48 V nominal systems (e.g., LIN bus, body control modules) without overvoltage damage to downstream ICs. |
| "Low Noise" fast response | <1 ns rise time per IEC 61000-4-2 ensures clamping activation before transient energy couples into sensitive analog or digital inputs. |
| AEC-Q101 qualification | Validated for automotive under-hood and cabin applications including temperature cycling, humidity bias, and mechanical shock per AEC-Q101 Rev D. |
| Solder process compatibility | Rated for peak reflow temperatures up to 260 °C (MSL Level 1), supporting lead-free assembly without delamination or parameter shift. |
| UL 94 V-0 molding compound | Flame-retardant encapsulation meets automotive and industrial safety standards for board-level fire propagation resistance. |
Applications
| Automotive LIN Bus Protection | Industrial RS-485 Interface |
|---|---|
Use Scenario: Protecting LIN transceivers in door modules and seat controllers against load dump and ESD events during vehicle assembly and service. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between LIN line and chassis ground to clamp transients while preserving DC bias and signal integrity. Use Value: Maintains 48 V VRWM margin above LIN's 12 V nominal supply and clamps to 77.4 V - well below typical transceiver ABSMAX of 80 V. |
Use Scenario: Safeguarding RS-485 transceivers in factory automation PLCs exposed to cable discharge and ground loop surges. IC Role / Device Role / Timing Role: Line-side transient suppressor on differential A/B bus lines, referenced to local ground with minimal added capacitance. Use Value: 161 pF capacitance avoids signal distortion at 250 kbps rates; 200 W pulse rating handles repetitive noise in electrically noisy plant floors. |
| Consumer HDMI Port Protection | Medical Sensor Power Rail Clamp |
Use Scenario: ESD hardening of HDMI Type-A connectors on set-top boxes and AV receivers subjected to user handling in dry climates. IC Role / Device Role / Timing Role: Unidirectional clamp on hot-plug detect (HPD) and DDC lines, grounded to shield to minimize common-mode coupling. Use Value: ±30 kV contact discharge rating exceeds IEC 61000-4-2 Level 4; low leakage (<0.1 μA at 48 V) prevents HPD false triggering. |
Use Scenario: Transient suppression on 48 V auxiliary power rails feeding isolated patient-monitoring sensor front-ends. IC Role / Device Role / Timing Role: Primary overvoltage clamp on non-isolated 48 V input, coordinated with upstream fuse and secondary LDO regulation. Use Value: 175 °C max junction temperature supports sealed enclosure thermal profiles; AEC-Q101 qualification adds confidence in long-term field reliability. |
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 package (4.5 mm × 2.7 mm), 400 W peak power (10/1000 μs). | Less suitable for tight 48 V rail margins; better for higher-energy surges where board space allows. | Select SMAJ48A-E3/57T only if system requires >400 W surge handling and layout accommodates larger footprint. |
| TPSMD48CA | Bidirectional configuration, same VRWM (48 V), slightly lower VC (75.5 V), 170 pF capacitance, also AEC-Q101 qualified. | Required where bidirectional transients (e.g., AC-coupled lines) or symmetrical surge sources exist. | Choose TPSMD48CA when protecting balanced interfaces like CAN FD or Ethernet PHYs needing dual-polarity clamping. |
Compared with SMAJ48A-E3/57T and TPSMD48CA, SMF48A-M3-08 offers the smallest footprint and lowest profile among AEC-Q101-qualified 48 V TVS diodes, making it optimal for ultra-dense automotive ECUs and portable medical devices where Z-height and board area are constrained.
Availability
SMF48A-M3-08 is available at Aetrix Electronics and suitable for automotive LIN bus protection, industrial RS-485 interfaces, consumer HDMI port hardening, and medical sensor power rail clamping requiring stable component supply across multi-year production cycles.
Supply support for SMF48A-M3-08 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 computing applications where compact size and AEC-Q101 compliance are mandatory.
FAQ
What is the maximum clamping voltage of the SMF48A-M3-08 under standard test conditions?
The SMF48A-M3-08 has a maximum reverse 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 - critical for ensuring compatibility with 48 V system ICs' absolute maximum ratings. The SMF48A-M3-08 maintains this performance across its full operating temperature range.
Is the SMF48A-M3-08 qualified to AEC-Q101, and what does that mean for automotive use?
Yes, the SMF48A-M3-08 is AEC-Q101 qualified, meeting stress test requirements for temperature cycling, humidity bias, mechanical shock, and ESD (HBM >8 kV). This qualification confirms its suitability for automotive applications including body electronics, infotainment, and powertrain subsystems where long-term reliability under harsh environmental conditions is required. The SMF48A-M3-08 is explicitly listed in Vishay's AEC-Q101 qualified product matrix.
What is the capacitance of the SMF48A-M3-08, and how does it affect high-speed signal lines?
The SMF48A-M3-08 exhibits a typical capacitance of 161 pF at 0 V and 1 MHz. This value limits its use to interfaces operating at ≤100 Mbps - such as LIN, RS-485, and legacy HDMI - where added capacitance does not cause excessive rise-time degradation or jitter. It is not recommended for USB 3.0, PCIe, or MIPI D-PHY due to bandwidth constraints. The SMF48A-M3-08's capacitance remains stable across reverse bias voltages up to VRWM.
How does the SMF48A-M3-08 compare to bidirectional TVS diodes like TPSMD48CA in circuit implementation?
Unlike bidirectional diodes such as TPSMD48CA, the SMF48A-M3-08 is unidirectional and must be oriented with cathode toward ground to protect positive-going transients on a single-rail line. It cannot suppress negative excursions below ground unless paired with a second device. The SMF48A-M3-08 simplifies layout in DC-biased applications (e.g., LIN, 48 V power rails) where only one polarity of surge is expected - reducing component count versus bidirectional solutions.
What package type does the SMF48A-M3-08 use, and is it compatible with standard SMT assembly processes?
The SMF48A-M3-08 uses the DO-219AB package (also known as SOD-123W), measuring 3.9 mm × 1.9 mm × 1.08 mm with a cathode band marking. It is fully compatible with wave and reflow soldering, rated for peak temperatures up to 260 °C per J-STD-020, and classified MSL Level 1 - meaning unlimited floor life before assembly. The SMF48A-M3-08's footprint matches industry-standard SOD-123W land patterns, enabling drop-in replacement in existing designs.
SMF48A-M3-08 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-M3-08 FAQ
1.How can I place an order for SMF48A-M3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF48A-M3-08 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-M3-08 reliable?
The price and inventory of SMF48A-M3-08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF48A-M3-08 is usually 5 days.
3.What payment methods are accepted for SMF48A-M3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF48A-M3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF48A-M3-08?
SMF48A-M3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF48A-M3-08 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-M3-08?
For technical support, including SMF48A-M3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF48A-M3-08 requirements.
6.How does Aetrix verify that SMF48A-M3-08 is sourced from the original manufacturer or authorized distributors?
All SMF48A-M3-08 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-M3-08 meets industry standards.
7.What is the process for return or replacement of SMF48A-M3-08?
All SMF48A-M3-08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF48A-M3-08, 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-M3-08 part is unused and in its original packaging.
Return procedure for SMF48A-M3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF48A-M3-08 Tags
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