My Inquiry
My Account
Vishay SMF22A-HM3_A18
- Part No.:
- SMF22A-HM3_A18
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF22A-HM3_A18.pdf
- Description:
- ESD PROTECTION DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,144
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMF22A-HM3_A18 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 stand-off voltage (VRWM), 35.5 A peak pulse current (IPPM), 35.5 V maximum clamping voltage (VC) at IPPM, ±30 kV IEC 61000-4-2 ESD immunity, and 271 pF typical capacitance at 0 V - ideal for USB 2.0, HDMI, and industrial sensor interface protection.
For engineers reviewing the SMF22A-HM3_A18 datasheet, SMF22A-HM3_A18 pinout, SMF22A-HM3_A18 application, or SMF22A-HM3_A18 equivalent, this page delivers verified electrical specs, package dimensions, real-world use cases, and validated alternative parts - all aligned with Vishay's Rev. 2.4 (04-Jul-2023) specification for the SMF22A family.
Technical Context
This device operates as a single-channel, unidirectional TVS diode optimized for low-capacitance, high-surge robustness protection. Its silicon avalanche structure enables sub-nanosecond response to ESD transients while maintaining tight clamping performance under 10/1000 μs surge conditions.
The SMF22A-HM3_A18 complies with AEC-Q101 (H3B-class ESD > 8 kV HBM) and IEC 61000-4-2 (±30 kV contact/air), and is rated for continuous operation from –65 °C to +175 °C - supporting automotive infotainment, industrial PLC I/O, and ruggedized communication ports.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 22 V - maximum continuous reverse operating voltage before clamping begins; sets safe margin above 18–20 V system rails. |
| Clamping Voltage (VC) | 35.5 V max at 5.6 A IPPM - limits downstream IC stress during 10/1000 μs surges; ensures logic-level compatibility with 3.3 V/5 V interfaces. |
| Peak Pulse Current (IPPM) | 5.6 A (10/1000 μs) - sustains defined surge energy without failure; correlates to 200 W peak power rating. |
| Capacitance (CD) | 271 pF at 0 V, 1 MHz - low enough for USB 2.0 (480 Mbps) signal integrity; avoids excessive rise-time degradation. |
| ESD Rating | ±30 kV contact / ±30 kV air per IEC 61000-4-2 - exceeds Level 4 immunity requirements for consumer and industrial end-equipment. |
| Operating Temp Range | –65 °C to +175 °C - supports under-hood automotive, motor drive control, and wide-temperature industrial deployments. |
| Package | DO-219AB (SOD-123W-compatible) - 3.9 × 1.9 × 1.08 mm low-profile outline enabling dense PCB layouts and automated reflow assembly. |
Pinout & Package
SMF22A-HM3_A18 uses the DO-219AB (SMF) package: cathode-bar marked, two-terminal SMD device with anode and cathode leads formed into gull-wing configuration. Molded epoxy body meets UL 94 V-0 flammability rating and J-STD-020 MSL level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Input side of protected line | Connected to signal trace requiring ESD protection; referenced to ground via cathode path during clamping. |
| Cathode (Pin 2) | Ground reference terminal | Connected to system ground plane; provides low-impedance discharge path for transients; marked by bar on top surface. |
Key Features
| Feature | Design Value |
|---|---|
| Low incremental surge resistance | Enables tighter clamping (35.5 V @ 5.6 A) vs. higher-resistance alternatives - reduces voltage overshoot across protected ICs. |
| "Low Noise" fast-response technology | Sub-nanosecond turn-on time minimizes transient propagation delay - critical for high-speed serial links like USB and CAN FD. |
| AEC-Q101 qualified | Validated for automotive-grade reliability including H3B-class HBM (> 8 kV), ensuring suitability for infotainment and ADAS sensor interfaces. |
| SOD-123W/SOD-123F footprint compatibility | Enables drop-in replacement or layout reuse across Vishay's eSMP® platform - simplifies BOM consolidation and second-source qualification. |
Applications
| USB 2.0 Data Lines | HDMI DDC/CEC Channels |
|---|---|
Use Scenario: Protecting differential USB 2.0 D+/D− traces against ESD events during hot-plug insertion in portable docking stations. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed inline between connector and USB transceiver IC. Use Value: 271 pF capacitance preserves signal integrity up to 480 Mbps; 35.5 V clamping prevents damage to 3.3 V PHY inputs. | Use Scenario: Safeguarding HDMI DDC (I²C) and CEC control lines in smart TVs and AV receivers exposed to user-handling ESD. IC Role / Device Role / Timing Role: Standoff-rated clamping device on bidirectional 5 V control bus with pull-up resistors. Use Value: 22 V VRWM allows full 5 V swing without leakage; ±30 kV ESD rating exceeds IEC 61000-4-2 Level 4 compliance. |
| Automotive Sensor Interfaces | Industrial RS-485 Transceivers |
Use Scenario: Shielding LIN or analog sensor outputs (e.g., temperature, pressure) in engine control modules subject to under-hood ESD and load dump coupling. IC Role / Device Role / Timing Role: Single-line transient suppressor on sensor signal path to microcontroller ADC input. Use Value: –65 °C to +175 °C operating range matches under-hood thermal profiles; AEC-Q101 qualification ensures long-term reliability. | Use Scenario: Protecting RS-485 transceiver pins in factory automation gateways connected to noisy field wiring. IC Role / Device Role / Timing Role: Line-side TVS on A/B differential pair and receiver enable lines. Use Value: 200 W peak pulse power handles induced surges from nearby motor switching; low clamping voltage prevents transceiver latch-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A-E3/57T | Higher 38.9 V clamping (VC) at same 5.6 A IPPM; SMA package (larger, 4.5 × 2.7 mm). | Less suitable for space-constrained USB/HDMI layouts; better for higher-energy surges where footprint permits. | Select when board area allows larger package and higher clamping is acceptable for 22 V rail systems. |
| TPD2E001DRYR | 2-channel, 15 pF ultra-low capacitance; lower 12 V VRWM; not AEC-Q101 qualified. | Optimized for high-speed USB 3.0/MIPI; insufficient for 22 V industrial sensor lines or automotive temp range. | Choose only for <1 Gbps digital interfaces requiring <20 pF; avoid for 22 V standoff or automotive deployment. |
Compared with SMAJ22A-E3/57T and TPD2E001DRYR, SMF22A-HM3_A18 uniquely balances 22 V standoff, 271 pF capacitance, AEC-Q101 qualification, and DO-219AB miniaturization - making it optimal for compact, high-reliability 22 V interface protection where both ESD robustness and signal fidelity matter.
Availability
SMF22A-HM3_A18 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, automotive sensor signal conditioning, and industrial RS-485 transceiver safeguarding requiring stable component supply and long-lifecycle support.
Supply support for SMF22A-HM3_A18 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 Intertechnology is a global manufacturer of discrete semiconductors and passive components, specializing in high-reliability, application-optimized devices for automotive, industrial, and computing markets.
The SMF series belongs to Vishay's eSMP® family of surface-mount TVS diodes, engineered specifically for low-capacitance, high-surge ESD protection in space-constrained, mission-critical electronic interfaces.
FAQ
What is the clamping voltage of SMF22A-HM3_A18 at its rated peak pulse current?
The SMF22A-HM3_A18 has a maximum clamping voltage (VC) of 35.5 V at its rated peak pulse current of 5.6 A (10/1000 μs waveform). This value is specified in Vishay's official datasheet Rev. 2.4 (04-Jul-2023), Table "Electrical Characteristics", and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring compatibility with 3.3 V or 5 V interface ICs.
Is SMF22A-HM3_A18 qualified to AEC-Q101 standards?
Yes, SMF22A-HM3_A18 is AEC-Q101 qualified, meeting the human body model (HBM) Class H3B requirement (> 8 kV) and demonstrating robustness for automotive applications. This qualification is explicitly stated in the "Features" section of the Vishay SMF5V0A–SMF58A datasheet (Rev. 2.4), confirming its suitability for infotainment, body control, and sensor interface modules in vehicles.
What package type does SMF22A-HM3_A18 use, and what are its key mechanical dimensions?
SMF22A-HM3_A18 uses the DO-219AB (SMF) package, also compatible with SOD-123W footprints. Its dimensions are 3.9 mm length × 1.9 mm width × 1.08 mm height, with a cathode bar marking on the top surface. These values are confirmed in the "Package Dimensions" drawing (Rev. 6, 24.Feb.2021) and "Package Data" table of the Vishay datasheet.
Does SMF22A-HM3_A18 support IEC 61000-4-2 ESD immunity, and at what levels?
Yes, SMF22A-HM3_A18 supports IEC 61000-4-2 ESD immunity at ±30 kV for both contact and air discharge tests - the highest level defined in the standard. This performance is documented in the "Features" section and "Absolute Maximum Ratings" table of the Vishay datasheet, making it appropriate for consumer, industrial, and automotive equipment requiring Level 4 ESD protection.
What is the typical junction capacitance of SMF22A-HM3_A18, and at what test condition is it measured?
The typical junction capacitance of SMF22A-HM3_A18 is 271 pF, measured at 0 V reverse bias and 1 MHz frequency. This value appears in the "Electrical Characteristics" table of the Vishay datasheet and directly impacts high-speed signal integrity - for example, enabling reliable operation on USB 2.0 (480 Mbps) lines without excessive rise-time distortion.
SMF22A-HM3_A18 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):
- 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 (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF22A-HM3_A18 FAQ
1.How can I place an order for SMF22A-HM3_A18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF22A-HM3_A18 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_A18 reliable?
The price and inventory of SMF22A-HM3_A18 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_A18 is usually 5 days.
3.What payment methods are accepted for SMF22A-HM3_A18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF22A-HM3_A18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF22A-HM3_A18?
SMF22A-HM3_A18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF22A-HM3_A18 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_A18?
For technical support, including SMF22A-HM3_A18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF22A-HM3_A18 requirements.
6.How does Aetrix verify that SMF22A-HM3_A18 is sourced from the original manufacturer or authorized distributors?
All SMF22A-HM3_A18 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_A18 meets industry standards.
7.What is the process for return or replacement of SMF22A-HM3_A18?
All SMF22A-HM3_A18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF22A-HM3_A18, 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_A18 part is unused and in its original packaging.
Return procedure for SMF22A-HM3_A18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF22A-HM3_A18 Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
