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Vishay General Semiconductor - Diodes Division SMF28A-HM3-18
- Part No.:
- SMF28A-HM3-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF28A-HM3-18.pdf
- Description:
- TVS DIODE 28VWM 45.4VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:3,401
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Product details
Overview
SMF28A-HM3-18 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 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) at 10/1000 μs, ±30 kV IEC 61000-4-2 ESD immunity, and 227 pF typical capacitance at 1 MHz - optimized for USB 2.0, HDMI, and industrial sensor interfaces.
For engineers reviewing the SMF28A-HM3-18 datasheet, SMF28A-HM3-18 pinout, SMF28A-HM3-18 application, or SMF28A-HM3-18 equivalent, this device is selected for robust electrostatic discharge protection where low clamping voltage (VC ≤ 45.4 V), AEC-Q101 qualification, and SOD-123W-compatible footprint are required in automotive infotainment and industrial control signal paths.
Technical Context
This diode operates as a unidirectional TVS clamp with cathode-anode polarity, leveraging silicon avalanche structure to respond within nanoseconds to ESD transients. Its low incremental surge resistance ensures minimal voltage overshoot during 8/20 μs surges up to 1000 W, while maintaining stable clamping under repeated ±30 kV contact/air discharges per IEC 61000-4-2.
The SMF28A-HM3-18 is rated for continuous operation from –65 °C to +175 °C, with thermal resistance RthJA = 180 K/W on standard epoxy-glass PCBs. Its DO-219AB package supports wave and reflow soldering per J-STD-020 MSL level 1, enabling compatibility with automated SMT assembly without derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 28 V - maximum continuous reverse voltage before leakage exceeds 0.1 μA; defines safe operating margin for 24 V nominal systems. |
| Reverse Breakdown (VBR) | 31.1–34.4 V at 1 mA - guaranteed avalanche onset range ensuring predictable clamping initiation across temperature and lot variation. |
| Peak Pulse Current (IPPM) | 4.4 A at 10/1000 μs - sustains single transient events without degradation; correlates to 200 W peak pulse power rating. |
| Clamping Voltage (VC) | ≤ 45.4 V at IPPM - limits downstream IC stress during worst-case surge; critical for protecting 3.3 V/5 V logic interfaces. |
| Capacitance (CD) | 227 pF at 0 V, 1 MHz - balances ESD robustness and signal integrity for <100 Mbps digital lines like CAN FD or RS-485. |
| ESD Rating | ±30 kV contact / ±30 kV air per IEC 61000-4-2 - exceeds Level 4 immunity requirements for automotive and industrial end-equipment. |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including HBM > 8 kV, enabling use in ADAS camera modules and body control units. |
Pinout & Package
SMF28A-HM3-18 uses the DO-219AB (SMF) package: low-profile (1.08 mm max height), 3.9 × 1.9 mm outline, compatible with SOD-123W footprints. Cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side terminal | Connected to protected signal line or power rail; conducts surge current toward ground when cathode is held at higher potential. |
| Cathode | Ground-reference terminal | Connected to system ground plane; establishes clamping reference and enables fast turn-on during positive transients on the anode. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Enables reliable protection against long-duration surges in industrial power supply inputs without thermal runaway. |
| "Low Noise" fast-response technology | Nanosecond-scale response ensures clamping activation before sensitive ICs experience overvoltage damage. |
| AEC-Q101 qualified | Validated for automotive applications including temperature cycling, mechanical shock, and humidity testing per JESD22 standards. |
| SOD-123W/SOD-123F/SOD-123FL compatible | Allows drop-in replacement or shared PCB footprint across Vishay's eSMP® portfolio, reducing layout redesign effort. |
| MSL level 1, reflow-compatible | Supports lead-free reflow up to 260 °C peak without preconditioning, simplifying manufacturing for high-volume OEMs. |
Applications
| Automotive Infotainment Display Interface | Industrial RS-485 Communication Port |
|---|---|
|
Use Scenario: Protecting LVDS or FPD-Link III video data lines between head unit and display in vehicles exposed to ESD during service or environmental charging. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed inline on differential pairs to clamp ESD-induced common-mode spikes before they reach serializer/deserializer ICs. Use Value: Maintains signal integrity below 227 pF while delivering ±30 kV contact discharge immunity - meeting ISO 10605 and CISPR 25 Class 5 requirements. |
Use Scenario: Safeguarding RS-485 transceivers in factory automation PLCs connected to long cable runs subject to lightning-induced surges and operator ESD. IC Role / Device Role / Timing Role: Standoff-clamp TVS on A/B bus lines referenced to local ground, absorbing 4.4 A transients without latch-up or parameter shift. Use Value: Clamps to ≤45.4 V at peak current, preventing transceiver damage while preserving DC common-mode range and fail-safe biasing. |
| USB 2.0 Host Port Protection | Smart Sensor Node Power Rail |
|
Use Scenario: ESD protection for D+/D– lines on embedded USB host controllers in medical devices and portable test equipment. IC Role / Device Role / Timing Role: Low-capacitance unidirectional clamp on each data line, grounded via short trace to chassis ground near connector. Use Value: 227 pF capacitance avoids signal rise/fall time degradation at 480 Mbps, while 28 V VRWM accommodates VBUS tolerance margins. |
Use Scenario: Transient suppression on 24 V auxiliary power input of battery-powered IoT sensors deployed in harsh electrical environments. IC Role / Device Role / Timing Role: Primary overvoltage clamp on input rail upstream of DC/DC converter, triggered by load dump or inductive switching events. Use Value: Withstands 1000 W (8/20 μs) surges and operates continuously from –65 °C to +175 °C - supporting extended outdoor deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28A-E3/57T | Higher clamping voltage (VC = 48.4 V), larger SMA package (4.5 × 2.7 mm), 5.0 A IPPM | Better suited for higher-energy surges but less suitable for space-constrained high-speed interfaces due to size and capacitance (350 pF) | Select SMAJ28A-E3/57T only when board area allows and 48.4 V clamping is acceptable for downstream ICs. |
| TPD2E001DRYR | Bi-directional, 15 pF capacitance, 3.6 V VRWM, integrated dual-channel design | Targeted at low-voltage, high-speed data lines (e.g., I²C, GPIO); not rated for 24 V rail protection or AEC-Q101 | Choose TPD2E001DRYR for sub-5 V digital I/O protection where ultra-low capacitance is mandatory - not for SMF28A-HM3-18's 28 V power/data role. |
Compared with SMAJ28A-E3/57T and TPD2E001DRYR, SMF28A-HM3-18 uniquely balances 28 V standoff, 227 pF, AEC-Q101 qualification, and DO-219AB compactness - making it optimal for automotive and industrial 24 V interface protection where footprint, reliability, and clamping precision are jointly constrained.
Availability
SMF28A-HM3-18 is available at Aetrix Electronics and suitable for automotive infotainment, industrial communication ports, and smart sensor node designs requiring stable component supply, AEC-Q101 compliance, and consistent ESD performance across production batches.
Supply support for SMF28A-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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.
The SMF series targets high-speed interface protection with AEC-Q101 qualification, low capacitance, and standardized SOD-123W-compatible packaging - engineered for ESD resilience in next-generation vehicle networks and ruggedized IoT edge nodes.
FAQ
What is the maximum clamping voltage of SMF28A-HM3-18 under peak pulse conditions?
The SMF28A-HM3-18 has a maximum reverse clamping voltage (VC) of 45.4 V at its rated peak pulse current (IPPM = 4.4 A) using a 10/1000 μs waveform. This value is guaranteed across temperature and process variation per Vishay's Electrical Characteristics table and ensures downstream ICs see limited overvoltage during ESD events. The SMF28A-HM3-18 maintains this clamping performance without degradation when operated within its absolute maximum ratings.
Is SMF28A-HM3-18 suitable for automotive applications?
Yes, SMF28A-HM3-18 is AEC-Q101 qualified and tested for human body model (HBM) > 8 kV, making it suitable for automotive applications including infotainment displays, body control modules, and ADAS sensor interfaces. Its operating temperature range of –65 °C to +175 °C and robust ±30 kV IEC 61000-4-2 ESD immunity align with automotive environmental requirements. The SMF28A-HM3-18 meets these criteria without derating in standard mounting configurations.
What package type does SMF28A-HM3-18 use, and is it compatible with automated assembly?
SMF28A-HM3-18 uses the DO-219AB (SMF) package - a low-profile, surface-mount outline measuring 3.9 × 1.9 × 1.08 mm, with MSL level 1 moisture sensitivity and full compatibility with J-STD-020-compliant reflow profiles (peak 260 °C). It is wave and reflow solderable, and its footprint matches SOD-123W, SOD-123F, and SOD-123FL packages. The SMF28A-HM3-18 supports high-yield automated SMT placement and soldering in volume production.
How does the capacitance of SMF28A-HM3-18 affect high-speed signal integrity?
SMF28A-HM3-18 exhibits 227 pF typical junction capacitance at 0 V and 1 MHz, which is optimized for data rates up to ~100 Mbps (e.g., RS-485, CAN FD, USB 2.0). This value minimizes signal distortion while retaining strong ESD clamping capability. For higher-speed interfaces (>480 Mbps), lower-capacitance alternatives may be needed - but the SMF28A-HM3-18's capacitance is intentionally balanced to protect 24 V industrial and automotive links without compromising timing margins. The SMF28A-HM3-18 datasheet confirms this value under standard test conditions.
What is the difference between SMF28A-HM3-18 and SMF28A-E3-18?
The "HM3" suffix in SMF28A-HM3-18 indicates AEC-Q101 qualification and enhanced automotive reliability screening, whereas "E3" denotes standard commercial-grade qualification. Both share identical electrical specs (VRWM = 28 V, VBR = 31.1–34.4 V, VC ≤ 45.4 V), DO-219AB package, and 8 mm tape/reel packaging (18 = 10K per 13″ reel). The SMF28A-HM3-18 adds automotive-specific stress testing and traceability - critical for Tier 1 automotive BOMs. The SMF28A-HM3-18 is the preferred choice where AEC-Q101 compliance is contractually required.
SMF28A-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):
- 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:
- -
- Capacitance @ Frequency:
- 227pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF28A-HM3-18 FAQ
1.How can I place an order for SMF28A-HM3-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF28A-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 SMF28A-HM3-18 reliable?
The price and inventory of SMF28A-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 SMF28A-HM3-18 is usually 5 days.
3.What payment methods are accepted for SMF28A-HM3-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF28A-HM3-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF28A-HM3-18?
SMF28A-HM3-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF28A-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 SMF28A-HM3-18?
For technical support, including SMF28A-HM3-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF28A-HM3-18 requirements.
6.How does Aetrix verify that SMF28A-HM3-18 is sourced from the original manufacturer or authorized distributors?
All SMF28A-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 SMF28A-HM3-18 meets industry standards.
7.What is the process for return or replacement of SMF28A-HM3-18?
All SMF28A-HM3-18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF28A-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 SMF28A-HM3-18 part is unused and in its original packaging.
Return procedure for SMF28A-HM3-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF28A-HM3-18 Tags
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