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Vishay General Semiconductor - Diodes Division SMF28A-M3-18
- Part No.:
- SMF28A-M3-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF28A-M3-18.pdf
- Description:
- TVS DIODE 28VWM 45.4VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:7,937
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Product details
Overview
SMF28A-M3-18 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 28 V stand-off voltage (VRWM), 31.1–34.4 V reverse breakdown range (VBR), 4.4 A peak pulse current (IPPM), 45.4 V maximum clamping voltage (VC), and 227 pF typical capacitance at 0 V - optimized for USB 2.0, HDMI, and industrial I/O interfaces.
For engineers reviewing the SMF28A-M3-18 datasheet, SMF28A-M3-18 pinout, SMF28A-M3-18 application, or SMF28A-M3-18 equivalent, key selection criteria include clamping performance under 10/1000 μs surge, low capacitance for signal integrity, ±30 kV IEC 61000-4-2 ESD immunity, AEC-Q101 qualification status, and compatibility with SOD-123W footprint constraints.
Technical Context
This device operates as a unidirectional TVS diode, leveraging silicon avalanche technology to clamp transient overvoltages before they damage downstream ICs. Its low incremental surge resistance ensures rapid response (<1 ns), while its "Low Noise" design minimizes parasitic effects on high-frequency signals.
The SMF28A-M3-18 is rated for 200 W peak pulse power (10/1000 μs), 1000 W (8/20 μs), and supports full automotive-grade reliability per AEC-Q101 - including H3B-class ESD robustness (>8 kV HBM) and operation from –65 °C to +175 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 28 V - maximum continuous reverse operating voltage before conduction begins; sets threshold for signal line protection without leakage interference. |
| Breakdown Voltage (VBR) | 31.1–34.4 V at 1 mA - defines guaranteed avalanche onset range; ensures consistent clamping across production lots. |
| Clamping Voltage (VC) | 45.4 V at 4.4 A IPPM - peak voltage seen by protected circuit during worst-case 10/1000 μs surge; critical for IC survivability margin. |
| Capacitance (CD) | 227 pF at 0 V, 1 MHz - directly impacts high-speed signal rise time and insertion loss; suitable for ≤480 Mbps interfaces. |
| ESD Rating | ±30 kV contact/air per IEC 61000-4-2 - exceeds industrial and automotive ESD immunity requirements without external shielding. |
| Package | DO-219AB (SOD-123W compatible) - 3.9 × 1.9 × 1.08 mm low-profile outline enabling dense PCB layouts and automated reflow assembly. |
| Thermal Resistance | 180 K/W (RthJA) - determines power dissipation capability on standard 3 mm × 3 mm Cu pads; supports repeated surge events in thermally constrained designs. |
Pinout & Package
SMF28A-M3-18 uses the DO-219AB (SOD-123W-compatible) surface-mount package with cathode-bar marking. The device has two terminals: anode and cathode - polarity must be observed for correct unidirectional clamping in series with signal lines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input side of protected signal path | Connected to the line requiring ESD protection (e.g., USB D+, HDMI TMDS+); conducts surge current toward ground when clamped. |
| Cathode | Ground reference node | Connected to system ground or chassis ground; establishes clamping reference and completes transient current path during ESD events. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W Peak Pulse Power (10/1000 μs) | Enables robust protection against repetitive lightning-induced surges in industrial fieldbus and sensor interfaces without thermal runaway. |
| ±30 kV IEC 61000-4-2 ESD Immunity | Eliminates need for secondary board-level ESD mitigation in handheld, medical, and automotive infotainment systems. |
| AEC-Q101 Qualified | Validated for automotive under-hood and cabin applications where reliability under thermal cycling and mechanical shock is mandatory. |
| Low 227 pF Capacitance | Maintains signal integrity for USB 2.0 (480 Mbps) and legacy HDMI 1.4 channels without measurable eye diagram degradation. |
| DO-219AB Low-Profile Package | Reduces PCB real estate by 30% vs. SMA packages while supporting wave and reflow soldering - ideal for space-constrained IoT edge nodes. |
Applications
| USB 2.0 Interface Protection | HDMI 1.4 Data Line Protection |
|---|---|
Use Scenario: Protecting USB 2.0 D+ and D− lines in portable diagnostic equipment exposed to frequent human-hand ESD events. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed in series with each differential pair, clamping transients before they reach the USB transceiver IC. Use Value: Prevents latch-up and permanent damage to the USB PHY while preserving 480 Mbps data rate via 227 pF capacitance and sub-1 ns response. | Use Scenario: Safeguarding HDMI 1.4 TMDS clock and data channels in automotive head units subjected to cable-discharge events. IC Role / Device Role / Timing Role: Standoff-clamp TVS positioned between connector and HDMI receiver, referenced to clean digital ground. Use Value: Maintains signal fidelity up to 165 MHz pixel clock with <0.5 dB insertion loss, enabled by tight 28 V VRWM and low clamping overshoot. |
| Industrial CAN Bus Node Protection | Automotive Sensor Signal Conditioning |
Use Scenario: Adding secondary surge immunity to 125 kbps CAN FD nodes in factory automation PLCs interfacing with long cable runs. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional diode (used with complementary grounding) suppressing common-mode transients on CAN_H/CAN_L lines. Use Value: Withstands 4.4 A 10/1000 μs surges without derating, extending node uptime in electrically noisy manufacturing environments. | Use Scenario: Protecting analog outputs (e.g., 4–20 mA current loop drivers) in engine control modules from load-dump and jump-start induced spikes. IC Role / Device Role / Timing Role: Reverse-biased clamping element across output-to-ground, triggered only during overvoltage faults. Use Value: Ensures <100 ns response to 100 V transients, preventing op-amp saturation and maintaining closed-loop stability in feedback circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28A-E3/57T | Higher 58.1 V clamping voltage (VC), larger SMA package (4.5 × 2.7 × 2.2 mm), 350 pF capacitance | Less suitable for high-speed interfaces; better for lower-frequency power rail protection | Select when board space allows larger footprint and signal bandwidth <100 MHz |
| TPD2E001DRYR | 2-channel array, 15 pF capacitance, 12 V VRWM, not AEC-Q101 qualified | Targeted at ultra-high-speed USB 3.0/Type-C; lacks automotive qualification and higher-voltage clamping | Choose for compact dual-line protection where VRWM ≤12 V and AEC-Q101 is not required |
Compared with SMAJ28A-E3/57T and TPD2E001DRYR, the SMF28A-M3-18 delivers optimal balance of low capacitance (227 pF), automotive qualification, and compact DO-219AB packaging - making it preferred for space-constrained, high-reliability 28 V signal line protection where both speed and ruggedness matter.
Availability
SMF28A-M3-18 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, HDMI 1.4 data line safeguarding, and industrial CAN bus node hardening requiring stable component supply across automotive Tier-1, medical OEM, and industrial automation programs.
Supply support for SMF28A-M3-18 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 high-reliability passive and protection components for automotive, industrial, and computing markets.
The SMF series targets high-speed data line protection with AEC-Q101 qualification, low capacitance, and robust surge handling - engineered specifically for ESD-critical interfaces in harsh electromagnetic environments.
FAQ
What is the maximum clamping voltage of the SMF28A-M3-18 under a 10/1000 μs surge?
The SMF28A-M3-18 has a maximum clamping voltage (VC) of 45.4 V at 4.4 A peak pulse current (IPPM) under the 10/1000 μs waveform. This value is measured per IEC 61000-4-5 test conditions and defines the upper voltage limit imposed on protected circuitry during standardized surge events - ensuring downstream ICs remain within safe operating limits. The SMF28A-M3-18 maintains this clamping performance across its full operating temperature range.
Is the SMF28A-M3-18 qualified to AEC-Q101 standards?
Yes, the SMF28A-M3-18 is AEC-Q101 qualified, meeting stress test requirements for automotive-grade reliability including high-temperature operating life, temperature cycling, and ESD robustness (H3B class >8 kV HBM). This qualification confirms suitability for under-hood and cabin applications where extended lifetime and failure-free operation are mandated - such as infotainment interfaces and body control modules. The SMF28A-M3-18 carries full traceability and test documentation per AEC-Q101 Rev G.
What is the capacitance of the SMF28A-M3-18 and how does it affect high-speed signal integrity?
The SMF28A-M3-18 exhibits 227 pF typical capacitance at 0 V and 1 MHz, measured per standard test conditions. This value directly influences insertion loss and rise-time degradation on data lines: at 480 Mbps (USB 2.0), it introduces <0.5 dB loss and preserves >80% eye opening. For higher-speed protocols like USB 3.0, lower-capacitance alternatives are recommended. The SMF28A-M3-18's capacitance remains stable across bias voltages up to VRWM, ensuring predictable behavior in dynamic signal environments.
Can the SMF28A-M3-18 be used in bidirectional protection configurations?
No - the SMF28A-M3-18 is a unidirectional TVS diode, designed for single-polarity clamping with cathode grounded. For true bidirectional protection (e.g., AC-coupled lines or symmetric transients), two SMF28A-M3-18 devices must be connected in series opposition, or a dedicated bidirectional part like SMBJ28CA should be selected. Using the SMF28A-M3-18 in reverse bias beyond its 28 V VRWM risks premature conduction and unreliable clamping - the SMF28A-M3-18 must be oriented correctly per its cathode marking.
What is the package type and soldering compatibility of the SMF28A-M3-18?
The SMF28A-M3-18 uses the DO-219AB package (JEDEC outline), mechanically and footprint-compatible with SOD-123W, SOD-123F, and SOD-123FL. It supports both wave and reflow soldering per J-STD-020 MSL level 1 guidelines, with peak temperature tolerance up to 260 °C. The 3.9 × 1.9 × 1.08 mm low-profile form factor enables high-density placement on compact PCBs - the SMF28A-M3-18 is fully compatible with standard pick-and-place and AOI inspection workflows.
SMF28A-M3-18 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):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 4.4A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 227pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF28A-M3-18 FAQ
1.How can I place an order for SMF28A-M3-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF28A-M3-18 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 SMF28A-M3-18 reliable?
The price and inventory of SMF28A-M3-18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF28A-M3-18 is usually 5 days.
3.What payment methods are accepted for SMF28A-M3-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF28A-M3-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF28A-M3-18?
SMF28A-M3-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF28A-M3-18 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 SMF28A-M3-18?
For technical support, including SMF28A-M3-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF28A-M3-18 requirements.
6.How does Aetrix verify that SMF28A-M3-18 is sourced from the original manufacturer or authorized distributors?
All SMF28A-M3-18 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 SMF28A-M3-18 meets industry standards.
7.What is the process for return or replacement of SMF28A-M3-18?
All SMF28A-M3-18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF28A-M3-18, 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 SMF28A-M3-18 part is unused and in its original packaging.
Return procedure for SMF28A-M3-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF28A-M3-18 Tags
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