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Vishay SMF28A-HM3_A08
- Part No.:
- SMF28A-HM3_A08
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF28A-HM3_A08.pdf
- Description:
- ESD PROTECTION DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,846
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Product details
Overview
SMF28A-HM3_A08 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 standoff 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 junction capacitance at 0 V - optimized for USB 2.0, HDMI, and industrial I/O protection.
For engineers reviewing the SMF28A-HM3_A08 datasheet, SMF28A-HM3_A08 pinout, SMF28A-HM3_A08 application, or SMF28A-HM3_A08 equivalent, this device is selected for robust ±30 kV IEC 61000-4-2 ESD immunity, low incremental surge resistance, and AEC-Q101 qualification - critical for automotive infotainment interfaces, industrial sensor nodes, and portable equipment with exposed connectors.
Technical Context
The SMF28A-HM3_A08 operates as a single-channel unidirectional TVS diode, leveraging silicon avalanche technology to clamp transients above its breakdown threshold while maintaining low leakage (<0.1 µA at 28 V). Its DO-219AB package enables compact PCB layout with MSL level 1 moisture sensitivity and compatibility with standard reflow profiles up to 260 °C.
It delivers 200 W peak pulse power (10/1000 µs waveform) and 1000 W (8/20 µs per IEC 61000-4-5), with thermal resistance RthJA = 180 K/W on a 3 mm × 3 mm Cu pad. The device sustains operation across -65 °C to +175 °C, supporting under-hood automotive and harsh industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 28 V - defines maximum continuous operating voltage before clamping begins; ensures signal integrity in 24 V industrial bus lines. |
| Breakdown Voltage (VBR) | 31.1–34.4 V at 1 mA - tight tolerance enables predictable turn-on during fast transients without false triggering. |
| Clamping Voltage (VC) | 45.4 V at 4.4 A IPPM - limits downstream IC stress during ESD events; compatible with 3.3 V/5 V logic I/O rails. |
| Junction Capacitance (CD) | 227 pF at 0 V, 1 MHz - balances ESD robustness and signal integrity for <100 Mbps interfaces like RS-485 or CAN FD. |
| ESD Immunity | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - exceeds Level 4 requirements for consumer and automotive end-equipment. |
| AEC-Q101 Qualified | Yes - validated for automotive applications including infotainment displays and body control modules. |
| Package | DO-219AB (SOD-123W-compatible) - 3.9 × 1.9 × 1.08 mm footprint supports high-density routing and automated assembly. |
Pinout & Package
SMF28A-HM3_A08 uses the DO-219AB (SMF) package: an ultra-low-profile, surface-mount case with cathode-bar marking. Dimensions are 3.9 mm (L) × 1.9 mm (W) × 1.08 mm (H); recommended footprint includes 1.3 mm × 1.3 mm pads with 2.9 mm center-to-center spacing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side | Connected to protected signal line (e.g., USB D+); conducts during negative transients when used unidirectionally. |
| Cathode | Ground reference | Connected to system ground or low-impedance return path; defines clamping direction and sets VRWM threshold. |
Key Features
| Feature | Design Value |
|---|---|
| "Low Noise" fast response | Sub-nanosecond turn-on time ensures clamping before sensitive ICs experience overvoltage stress. |
| 200 W peak pulse power (10/1000 µs) | Handles repetitive ESD bursts in automated test equipment and factory floor interfaces without degradation. |
| Wave and reflow solderable | Compatible with J-STD-020 Class 2 reflow profile (peak 260 °C), enabling seamless integration into high-volume SMT lines. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients, improving protection margin for 3.3 V microcontrollers. |
| UL 94 V-0 molding compound | Meets flammability safety standards for enclosed industrial enclosures and automotive cabin modules. |
Applications
| USB 2.0 Port Protection | HDMI Interface Protection |
|---|---|
Use Scenario: Protecting upstream/downstream USB 2.0 ports on docking stations against connector hot-plug ESD. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between D+/D− lines and chassis ground to shunt ESD energy away from USB transceivers. Use Value: 227 pF capacitance avoids signal integrity loss at 480 Mbps; ±30 kV rating prevents latch-up in USB PHY ICs during handling. | Use Scenario: Safeguarding HDMI source/sink ports in automotive head units from cable-discharge events. IC Role / Device Role / Timing Role: Single-channel ESD suppressor on TMDS clock/data lanes, referenced to local ground plane. Use Value: 45.4 V clamping voltage stays below HDMI receiver absolute max ratings; DO-219AB size fits tight connector-side layouts. |
| Industrial RS-485 Node | Automotive Body Control Module |
Use Scenario: Transient protection for half-duplex RS-485 transceivers in factory automation PLCs. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional diode (cathode to ground) on A/B differential pair to clamp common-mode surges. Use Value: 28 V VRWM aligns with RS-485 common-mode range; 175 °C max junction temperature supports extended outdoor operation. | Use Scenario: ESD hardening of LIN bus or switch inputs in door module ECUs exposed to human touch. IC Role / Device Role / Timing Role: Point-of-entry protection on wake-up pins and sensor inputs, mounted adjacent to connectors. Use Value: AEC-Q101 qualification ensures reliability over 15-year vehicle life; 0.1 µA leakage preserves battery drain budgets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28A-E3/5A | DO-214AC (SMA) package; 2.5 mm height vs. 1.08 mm; 4.3 A IPPM; 48.4 V VC | Larger footprint; less suitable for ultra-thin portable designs or fine-pitch HDMI connectors | Choose SMAJ28A-E3/5A only if board space allows taller components and higher clamping voltage is acceptable. |
| TPD2E001DRYR | 2-channel, 15 pF dual-line ESD array in SOT-553; 12 V VRWM; not AEC-Q101 qualified | Lower capacitance ideal for USB 3.0/PCIe; lacks automotive qualification and 28 V standoff capability | Choose TPD2E001DRYR for high-speed digital interfaces requiring sub-20 pF loading, but not for 24 V industrial or automotive use. |
Compared with SMAJ28A-E3/5A and TPD2E001DRYR, SMF28A-HM3_A08 uniquely combines AEC-Q101 qualification, 28 V standoff, ultra-low profile (1.08 mm), and ±30 kV ESD rating - making it optimal for space-constrained automotive and industrial edge nodes where reliability and height are critical.
Availability
SMF28A-HM3_A08 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial RS-485 networks, and portable medical devices requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant ESD protection.
Supply support for SMF28A-HM3_A08 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 optimized capacitance-clamping trade-offs; it was engineered specifically for next-generation automotive infotainment, industrial IoT sensors, and compact consumer electronics needing certified ESD resilience.
FAQ
What is the maximum clamping voltage of SMF28A-HM3_A08 at its rated peak pulse current?
The SMF28A-HM3_A08 has a maximum clamping voltage (VC) of 45.4 V at its rated peak pulse current (IPPM) of 4.4 A under a 10/1000 µs waveform. This value is specified in the Electrical Characteristics table of Vishay's document 85881 and ensures downstream ICs remain within safe operating limits during ESD events. The clamping performance is consistent across the full operating temperature range of -65 °C to +175 °C.
Is SMF28A-HM3_A08 qualified to AEC-Q101, and what does that mean for automotive use?
Yes, SMF28A-HM3_A08 is AEC-Q101 qualified, as confirmed in Vishay's SMF5V0A–SMF58A datasheet (Rev. 2.4). This qualification validates its reliability for automotive applications including engine bay, cabin, and infotainment systems - covering stress tests for temperature cycling, humidity, mechanical shock, and ESD. The SMF28A-HM3_A08 meets human body model (HBM) Class H3B (>8 kV) and IEC 61000-4-2 (±30 kV) requirements essential for automotive ECUs.
What is the junction capacitance of SMF28A-HM3_A08, and how does it affect high-speed signal lines?
The SMF28A-HM3_A08 exhibits a typical junction capacitance (CD) of 227 pF at 0 V and 1 MHz, per Vishay's datasheet. While higher than ultra-low-capacitance arrays, this value is well-suited for interfaces up to 100 Mbps (e.g., RS-485, LIN, legacy USB 2.0) where robust ESD protection takes priority over GHz bandwidth. For HDMI or USB 3.0, lower-capacitance alternatives would be preferred - but SMF28A-HM3_A08 remains optimal where 28 V standoff and ±30 kV immunity are mandatory.
Can SMF28A-HM3_A08 be used in bidirectional configurations, and what are the limitations?
SMF28A-HM3_A08 is a unidirectional TVS diode, meaning it clamps only positive transients relative to its cathode. To protect AC-coupled or truly bidirectional lines (e.g., USB D+/D−), two devices must be used back-to-back, or a dedicated bidirectional part like SMBJ28A should be selected. Using SMF28A-HM3_A08 alone on a bidirectional line leaves negative transients unprotected - so circuit topology must match its unidirectional architecture to ensure full coverage.
What is the moisture sensitivity level (MSL) and reflow profile compliance for SMF28A-HM3_A08?
SMF28A-HM3_A08 has a moisture sensitivity level (MSL) of 1 per J-STD-020, meaning it is not moisture-sensitive and can be stored indefinitely at ambient conditions without baking. It is fully compatible with standard lead-free reflow profiles, supporting peak temperatures up to 260 °C. The DO-219AB package's UL 94 V-0 molding compound and wave/reflow solderability make SMF28A-HM3_A08 suitable for high-yield, high-reliability SMT manufacturing without special handling.
SMF28A-HM3_A08 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay
- 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 (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF28A-HM3_A08 FAQ
1.How can I place an order for SMF28A-HM3_A08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF28A-HM3_A08 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_A08 reliable?
The price and inventory of SMF28A-HM3_A08 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_A08 is usually 5 days.
3.What payment methods are accepted for SMF28A-HM3_A08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF28A-HM3_A08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF28A-HM3_A08?
SMF28A-HM3_A08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF28A-HM3_A08 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_A08?
For technical support, including SMF28A-HM3_A08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF28A-HM3_A08 requirements.
6.How does Aetrix verify that SMF28A-HM3_A08 is sourced from the original manufacturer or authorized distributors?
All SMF28A-HM3_A08 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_A08 meets industry standards.
7.What is the process for return or replacement of SMF28A-HM3_A08?
All SMF28A-HM3_A08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF28A-HM3_A08, 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_A08 part is unused and in its original packaging.
Return procedure for SMF28A-HM3_A08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF28A-HM3_A08 Tags
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