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Vishay General Semiconductor - Diodes Division SMF22A-HM3-08
- Part No.:
- SMF22A-HM3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF22A-HM3-08.pdf
- Description:
- TVS DIODE 22VWM 35.5VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:9,220
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Product details
Overview
SMF22A-HM3-08 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. It features a 22 V standoff voltage (VRWM), 24.4–27 V reverse breakdown (VBR), 5.6 A peak pulse current (IPPM), 35.5 V maximum clamping voltage (VC), and 271 pF typical capacitance at 1 MHz - optimized for USB 2.0, HDMI, and industrial I/O interfaces.
For engineers reviewing the SMF22A-HM3-08 datasheet, SMF22A-HM3-08 pinout, SMF22A-HM3-08 application, or SMF22A-HM3-08 equivalent, key selection criteria include clamping performance under 10/1000 μs surge, ±30 kV IEC 61000-4-2 ESD immunity, AEC-Q101 qualification status, SOD-123W-compatible footprint, and low incremental surge resistance for robust signal integrity preservation.
Technical Context
This device operates as a single-channel unidirectional TVS diode with cathode-anode polarity, leveraging silicon avalanche technology to clamp transients before downstream ICs are damaged. Its low clamping ratio (VC/VBR ≈ 1.35) and fast response time (<1 ns) enable effective protection of 3.3 V–24 V logic and interface circuits against ESD, EFT, and lightning-induced surges.
The SMF22A-HM3-08 is rated for 200 W peak pulse power (10/1000 μs), 1000 W (8/20 μs), and supports reflow/wave soldering per J-STD-020 MSL level 1. Its thermal resistance (RthJA = 180 K/W) and junction temperature range (–65 °C to +175 °C) support operation in automotive under-hood and industrial control environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 22 V - maximum continuous reverse operating voltage before leakage exceeds 0.1 μA |
| Breakdown Voltage (VBR) | 24.4–27 V at 1 mA - precise avalanche onset ensures predictable clamping threshold |
| Clamping Voltage (VC) | 35.5 V at 5.6 A (10/1000 μs) - limits voltage seen by protected IC to safe margin below damage threshold |
| Peak Pulse Current (IPPM) | 5.6 A (10/1000 μs) - defines maximum transient energy the device can safely divert without degradation |
| Capacitance (CD) | 271 pF at 0 V, 1 MHz - low enough for USB 2.0 (480 Mbps) and RS-485, but not suitable for USB 3.x or PCIe |
| ESD Rating | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - exceeds Level 4 immunity requirements for end-equipment certification |
| Package | DO-219AB (SOD-123W-compatible) - 3.9 × 1.9 × 1.08 mm low-profile outline enabling dense PCB layouts |
Pinout & Package
SMF22A-HM3-08 uses the DO-219AB (SMF) package: a two-terminal, surface-mount, molded plastic case with cathode band marking. Dimensions: 3.9 mm length × 1.9 mm width × 1.08 mm height. Compatible with standard SOD-123W footprint and reflow profiles (peak 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Low-side reference node | Connected to ground or common return path; establishes reference for clamping action |
| Cathode (banded end) | Protected line input | Connected to signal/data line; conducts during overvoltage to shunt surge current to ground |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Enables reliable protection against repetitive surge events in industrial automation I/O modules |
| ±30 kV IEC 61000-4-2 ESD immunity | Meets highest system-level ESD test requirement without external shielding or layout mitigation |
| AEC-Q101 qualified option available | Validated for automotive applications including infotainment and body electronics where reliability is critical |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients, improving clamping accuracy for sensitive receivers |
| "Low Noise" fast-response technology | Sub-nanosecond turn-on ensures protection activates before ESD pulse edge damages CMOS inputs |
Applications
| USB 2.0 Interface Protection | HDMI DDC Line Protection |
|---|---|
Use Scenario: Protecting USB 2.0 data lines (D+/D−) on host controllers and peripheral devices against user-handling ESD events. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between signal line and ground, clamping transients before they reach USB transceiver ICs. Use Value: 271 pF capacitance avoids signal integrity degradation at 480 Mbps; 35.5 V clamping prevents latch-up in 3.3 V PHYs. | Use Scenario: Safeguarding HDMI Display Data Channel (DDC) lines (SCL/SDA) from electrostatic discharge during cable insertion/removal. IC Role / Device Role / Timing Role: Standoff-rated TVS diode connected inline on 5 V-tolerant I²C bus lines to suppress ESD without loading communication timing. Use Value: 22 V VRWM allows full 5 V logic swing while blocking normal operation; ±30 kV rating covers worst-case human-body model exposure. |
| Industrial RS-485 Transceiver Protection | Automotive Body Control Module I/O |
Use Scenario: Shielding RS-485 differential pairs in factory-floor PLCs and motor drives from induced surges and ESD coupling. IC Role / Device Role / Timing Role: Discrete unidirectional TVS per line (A/B) referenced to local ground, absorbing common-mode transients before receiver inputs. Use Value: 200 W pulse rating handles 10/1000 μs surges from nearby relay switching; 175 °C max junction temperature supports extended ambient operation. | Use Scenario: Protecting low-voltage sensor inputs (e.g., door switch, ambient light) in automotive BCMs exposed to harsh ESD environments. IC Role / Device Role / Timing Role: Ground-referenced ESD clamp on 12 V or 5 V supply-sensed lines, qualified to AEC-Q101 for automotive-grade reliability. Use Value: AEC-Q101 qualification confirms robustness across –40 °C to +125 °C operating range; DO-219AB package withstands mechanical vibration and thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A-E3/5A | Higher clamping voltage (41.5 V), larger SMA package (4.5 × 2.7 × 2.2 mm), same 22 V VRWM | Less suitable for space-constrained USB/HDMI designs due to 2.3× larger footprint and higher inductance | Select when higher surge margin (400 W peak power) is prioritized over board area and signal integrity |
| TPD2E001DRYR | 2-channel, 15 pF per line, 5.5 V VRWM, integrated ESD array in 1.4 × 1.0 mm USON | Designed for ultra-low-capacitance high-speed interfaces (e.g., USB 3.0, MIPI), not compatible with 22 V systems | Choose only for multi-line, low-voltage, high-frequency applications requiring <20 pF loading |
Compared with SMAJ22A-E3/5A and TPD2E001DRYR, SMF22A-HM3-08 delivers optimal balance of compact size, 22 V system compatibility, and proven ESD robustness for mid-speed industrial and consumer interfaces - without sacrificing surge handling or thermal resilience.
Availability
SMF22A-HM3-08 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, HDMI DDC line safeguarding, and industrial RS-485 transceiver hardening requiring stable component supply and long-term lifecycle assurance.
Supply support for SMF22A-HM3-08 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 power management, sensing, and circuit protection components with emphasis on reliability, precision, and automotive-grade qualification.
The SMF series belongs to Vishay's eSMP® family of surface-mount TVS diodes, engineered specifically for high-efficiency ESD and surge protection in space-constrained, high-reliability applications across automotive, industrial, and computing markets.
FAQ
What is the clamping voltage of SMF22A-HM3-08 at its rated peak pulse current?
The SMF22A-HM3-08 has a maximum clamping voltage (VC) of 35.5 V at 5.6 A peak pulse current with a 10/1000 μs waveform. This value is measured under standardized surge conditions and guarantees that protected circuitry sees no more than 35.5 V during transient events - critical for safeguarding 24 V-rated receivers and 3.3 V/5 V logic interfaces. The SMF22A-HM3-08 maintains this clamping performance across its full operating temperature range.
Is SMF22A-HM3-08 AEC-Q101 qualified?
The SMF22A-HM3-08 is part of Vishay's AEC-Q101-qualified SMF family, with qualification confirmed in the official datasheet revision 2.4. While the specific HM3-08 suffix denotes tape-and-reel packaging and RoHS compliance, the underlying die and construction meet AEC-Q101 stress test requirements for temperature cycling, HTRB, and ESD. For automotive use, confirm qualification status via Vishay's official part search using "SMF22A" as base number.
What does the 'HM3' in SMF22A-HM3-08 signify?
The 'HM3' in SMF22A-HM3-08 indicates Vishay's environmental and quality code: 'H' denotes AEC-Q101 qualification, 'M3' specifies lead (Pb)-free terminations with matte tin plating and compliance with RoHS Directive 2011/65/EU. This coding aligns with Vishay's standardized ordering nomenclature shown in the SMF datasheet's "Ordering Information" table, confirming both reliability and regulatory conformance for the SMF22A-HM3-08.
Can SMF22A-HM3-08 be used in bidirectional signal lines?
No - SMF22A-HM3-08 is a unidirectional TVS diode intended for DC-biased or ground-referenced lines. Its electrical characteristics (e.g., 22 V VRWM, cathode-anode polarity) assume a fixed voltage reference. For bidirectional AC-coupled or floating lines like RS-485 differential pairs, a dual-diode configuration or dedicated bidirectional TVS such as SMBJ22CA is required. Using SMF22A-HM3-08 on truly bidirectional paths risks forward conduction and signal distortion.
What is the moisture sensitivity level (MSL) rating for SMF22A-HM3-08?
The SMF22A-HM3-08 carries an MSL level 1 rating per J-STD-020, meaning it is not moisture-sensitive and may be stored indefinitely at ambient conditions without dry-pack requirements or floor-life limitations. This simplifies handling, eliminates bake-out steps prior to reflow, and supports standard SMT assembly processes - a key advantage for high-volume manufacturing of industrial and automotive electronics using the SMF22A-HM3-08.
SMF22A-HM3-08 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):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 5.6A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 271pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF22A-HM3-08 FAQ
1.How can I place an order for SMF22A-HM3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF22A-HM3-08 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 SMF22A-HM3-08 reliable?
The price and inventory of SMF22A-HM3-08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF22A-HM3-08 is usually 5 days.
3.What payment methods are accepted for SMF22A-HM3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF22A-HM3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF22A-HM3-08?
SMF22A-HM3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF22A-HM3-08 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 SMF22A-HM3-08?
For technical support, including SMF22A-HM3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF22A-HM3-08 requirements.
6.How does Aetrix verify that SMF22A-HM3-08 is sourced from the original manufacturer or authorized distributors?
All SMF22A-HM3-08 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 SMF22A-HM3-08 meets industry standards.
7.What is the process for return or replacement of SMF22A-HM3-08?
All SMF22A-HM3-08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF22A-HM3-08, 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 SMF22A-HM3-08 part is unused and in its original packaging.
Return procedure for SMF22A-HM3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF22A-HM3-08 Tags
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