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Vishay General Semiconductor - Diodes Division SMF28A-M3-08
- Part No.:
- SMF28A-M3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF28A-M3-08.pdf
- Description:
- TVS DIODE 28VWM 45.4VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:29,855
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Product details
Overview
SMF28A-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 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-M3-08 datasheet, SMF28A-M3-08 pinout, SMF28A-M3-08 application, or SMF28A-M3-08 equivalent, key selection criteria include clamping performance under 10/1000 μs surge, ±30 kV IEC 61000-4-2 ESD immunity, AEC-Q101 qualification status, low-profile SOD-123W-compatible footprint, and junction temperature capability up to +175 °C.
Technical Context
This device operates as a single-channel unidirectional TVS diode with avalanche breakdown behavior, providing fast response (<1 ns) clamping during ESD events. Its low incremental surge resistance ensures minimal voltage overshoot during 50 A forward surge pulses, while its 227 pF capacitance supports signal integrity in sub-100 MHz applications without excessive loading.
The SMF28A-M3-08 uses silicon planar technology with "Low Noise" design for stable clamping across temperature (-65 °C to +175 °C), and is qualified per AEC-Q101 for automotive-grade reliability. It complies with IEC 61000-4-2 (±30 kV contact/air) and IEC 61000-4-5 (1000 W, 8/20 μs), with thermal resistance RthJA = 180 K/W on standard epoxy-glass PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 28 V - maximum continuous reverse operating voltage before leakage exceeds 0.1 μA; defines safe operating margin for 24 V systems. |
| Reverse Breakdown (VBR) | 31.1–34.4 V at 1 mA - onset of controlled avalanche conduction; ensures reliable triggering above system operating voltage. |
| Clamping Voltage (VC) | 45.4 V at 4.4 A (10/1000 μs) - peak voltage seen by protected circuit during surge; critical for IC-level overvoltage margin. |
| Capacitance (CD) | 227 pF at 0 V, 1 MHz - low enough for USB 2.0 (480 Mbps) and CAN FD signal integrity; avoids signal distortion or rise-time degradation. |
| ESD Immunity | ±30 kV contact / ±30 kV air per IEC 61000-4-2 - meets highest industrial and automotive ESD robustness requirements without external shielding. |
| Peak Pulse Power | 200 W (10/1000 μs), 1000 W (8/20 μs) - sustains multiple transient events in motor control feedback lines and sensor interfaces. |
| Junction Temperature | -65 °C to +175 °C - enables deployment in under-hood automotive modules, industrial PLCs, and outdoor telecom equipment. |
Pinout & Package
SMF28A-M3-08 is housed in the DO-219AB (SOD-123W) package: low-profile (1.08 mm max height), 3.9 mm × 1.9 mm footprint, cathode-bar marked, compatible with wave and reflow soldering (peak 260 °C). MSL Level 1, RoHS-compliant, tin-plated terminations.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side connection | Connected to signal/power line requiring protection; conducts surge current toward ground when clamped. |
| Cathode | Ground reference terminal | Connected to system ground plane; establishes reference for clamping action and defines unidirectional polarity. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Supports repeated surge events in industrial fieldbus nodes without parameter drift or thermal runaway. |
| ±30 kV ESD immunity (IEC 61000-4-2) | Eliminates need for secondary ESD protection stages in handheld test equipment and human-interface ports. |
| AEC-Q101 qualified option available | Validated for automotive body electronics, infotainment I/O, and ADAS sensor interfaces requiring zero-failure reliability. |
| 227 pF capacitance at 0 V | Enables direct placement on USB 2.0 D+/D− lines without degrading eye diagram or increasing bit error rate. |
| Low-profile DO-219AB package | Reduces board space vs. SMA/SMB packages; allows dense routing in compact IoT edge controllers and wearable modules. |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
|
Use Scenario: Protecting analog output lines (4–20 mA) and digital I/O (CAN, LIN) in factory automation sensors exposed to cable discharge events. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between signal line and chassis ground to clamp transients before reaching ADC or microcontroller GPIO. Use Value: Maintains <1 μA leakage at 28 V VRWM to avoid offset errors in precision current loops while clamping to ≤45.4 V during 4.4 A surges. |
Use Scenario: ESD protection for door module switches, mirror controls, and ambient light sensor inputs in passenger vehicles. IC Role / Device Role / Timing Role: Primary ESD suppressor on low-voltage (12 V nominal) signal paths, mounted directly at connector entry points. Use Value: Delivers ±30 kV contact discharge immunity and AEC-Q101 qualification, enabling compliance with ISO 10605 without additional layout shielding. |
| USB 2.0 Peripheral Port | Power Rail Transient Suppression |
|
Use Scenario: Protecting D+ and D− lines of embedded USB host ports in medical diagnostic devices and point-of-sale terminals. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional diode (anode-to-ground configuration) minimizing capacitance-induced signal jitter. Use Value: 227 pF capacitance preserves USB 2.0 eye opening and meets USB-IF signal integrity requirements up to 480 Mbps. |
Use Scenario: Clamping voltage spikes on 24 V DC input rails of programmable logic controllers subjected to inductive load switching. IC Role / Device Role / Timing Role: Standoff-rated TVS placed between rail and ground to absorb 10/1000 μs surges exceeding 100 V. Use Value: 200 W peak pulse power rating handles repetitive 50 V/100 ms transients common in factory floor power distribution systems. |
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 clamping voltage (49.9 V), larger SMA package (4.5 mm × 2.7 mm), 350 pF capacitance | Less suitable for high-speed data lines; better for power rail-only protection where size and capacitance are secondary | Select SMAJ28A-E3/57T only when board space permits larger footprint and signal bandwidth is below 10 MHz. |
| TPD2E001DRYR | 2-channel, 15 pF per line, 12 V VRWM, not AEC-Q101 qualified, 30 kV ESD rating | Designed for dual-line USB/DisplayPort protection; insufficient for 24 V system rail protection due to lower VRWM | Choose TPD2E001DRYR for space-constrained dual-data-line applications but verify VRWM compatibility with system voltage. |
Compared with SMAJ28A-E3/57T and TPD2E001DRYR, SMF28A-M3-08 uniquely balances 28 V VRWM, 227 pF capacitance, DO-219AB compactness, and AEC-Q101 readiness - making it optimal for 24 V industrial I/O and automotive body electronics where both signal fidelity and ruggedness are required.
Availability
SMF28A-M3-08 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, USB 2.0 peripheral ports, and 24 V power rail transient suppression requiring stable component supply across long-lifecycle programs.
Supply support for SMF28A-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 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 space-constrained applications, with design emphasis on low capacitance, fast response, and AEC-Q101 qualification for automotive electronics and harsh-environment industrial systems.
FAQ
What is the clamping voltage of SMF28A-M3-08 at its rated peak pulse current?
The SMF28A-M3-08 has a maximum clamping voltage (VC) of 45.4 V at 4.4 A peak pulse current with 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 clamping performance is guaranteed across the full operating temperature range of -65 °C to +175 °C, ensuring consistent protection in extreme environments where SMF28A-M3-08 is deployed.
Is SMF28A-M3-08 qualified to AEC-Q101?
SMF28A-M3-08 is offered in an AEC-Q101-qualified version (e.g., SMF28A-HE3_A08), but the -M3-08 suffix indicates the standard industrial-grade variant. The datasheet confirms AEC-Q101 qualification is available for the SMF28A family, with testing including HTGB, AC/DC life test, and ESD HBM >8 kV. For automotive applications, specify the HE3_Axx variant to ensure SMF28A-M3-08's successor meets full AEC-Q101 requirements.
What is the capacitance of SMF28A-M3-08 and how does it affect high-speed signal lines?
SMF28A-M3-08 exhibits 227 pF typical capacitance at 0 V and 1 MHz. This value is low enough to preserve signal integrity on USB 2.0 (480 Mbps) and RS-485 lines without significant rise-time degradation or reflection. At higher frequencies (>100 MHz), the effective capacitance decreases due to parasitic inductance, but for most industrial I/O and automotive sensor interfaces, SMF28A-M3-08's capacitance enables direct placement without equalization or compensation.
Can SMF28A-M3-08 be used for bidirectional protection?
No - SMF28A-M3-08 is a unidirectional TVS diode, intended for use with defined polarity (anode to line, cathode to ground). It does not provide symmetrical clamping for AC-coupled or differential signals. For bidirectional protection, two SMF28A-M3-08 devices may be connected in series opposing configuration, but Vishay recommends dedicated bidirectional parts like SMBJ28A for such applications. Using SMF28A-M3-08 in reverse bias beyond VRWM risks permanent damage.
What is the thermal resistance and maximum junction temperature of SMF28A-M3-08?
SMF28A-M3-08 has a junction-to-ambient thermal resistance (RthJA) of 180 K/W when mounted on a standard epoxy-glass PCB with 3 mm × 3 mm copper pads ≥40 μm thick. Its maximum junction temperature is +175 °C, and storage/operating temperature range spans -65 °C to +175 °C. This wide thermal envelope supports use in engine bay modules, industrial drives, and outdoor base stations where SMF28A-M3-08 must sustain repeated surge events without derating.
SMF28A-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):
- 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-M3-08 FAQ
1.How can I place an order for SMF28A-M3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF28A-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 SMF28A-M3-08 reliable?
The price and inventory of SMF28A-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 SMF28A-M3-08 is usually 5 days.
3.What payment methods are accepted for SMF28A-M3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF28A-M3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF28A-M3-08?
SMF28A-M3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF28A-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 SMF28A-M3-08?
For technical support, including SMF28A-M3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF28A-M3-08 requirements.
6.How does Aetrix verify that SMF28A-M3-08 is sourced from the original manufacturer or authorized distributors?
All SMF28A-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 SMF28A-M3-08 meets industry standards.
7.What is the process for return or replacement of SMF28A-M3-08?
All SMF28A-M3-08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF28A-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 SMF28A-M3-08 part is unused and in its original packaging.
Return procedure for SMF28A-M3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF28A-M3-08 Tags
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