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Home > Products > Filters > Common Mode Chokes

STMicroelectronics ECMF02-4CMX8

Name: ECMF02-4CMX8
Brand: STMicroelectronics
SKU: ECMF02-4CMX8
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ECMF02-4CMX8

Manufacturer:: STMicroelectronics

Category:: Common Mode Chokes

Package:: 8-UFDFN

Datasheet:: ECMF02-4CMX8.pdf

Description:: CMC 2LN SMD ESD

Quantity:: RFQ Add To RFQ list

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Inventory:160,562

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Product details

Overview

ECMF02-4CMX8 from STMicroelectronics is a monolithic common mode filter with integrated bidirectional ESD protection for USB 2.0 differential data lines (D+/D−), VBUS, and ID pins; features 6 V breakdown voltage on data lines, ±15 kV air/±8 kV contact IEC 61000-4-2 compliance, 3–4 Ω DC serial resistance, <0.55 mm height, and optimized flow-through footprint for high-speed signal integrity.

For engineers reviewing the ECMF02-4CMX8 datasheet, ECMF02-4CMX8 pinout, ECMF02-4CMX8 application, or ECMF02-4CMX8 equivalent, this device supports USB 2.0 eye diagram compliance, common mode attenuation at 900 MHz/1.8 GHz, audio-over-USB functionality, and board-level ESD hardening in space-constrained portable interfaces.

Technical Context

The ECMF02-4CMX8 integrates a passive LC-based common mode choke with TVS diodes on all four protected lines (D+, D−, VBUS, ID), enabling simultaneous differential signal pass-through and common mode noise suppression above 900 MHz. Its symmetrical layout preserves USB 2.0 impedance matching (Z_diff = 90 Ω, Z_com = 45 Ω) while maintaining <4 Ω DC path resistance per data line.

ESD protection employs low-capacitance silicon diodes with clamping voltages of 20 V (IPP = 1 A) and 24 V (IPP = 2.5 A) on VBUS, and 6 V breakdown on D+/D−/ID lines - all rated to IEC 61000-4-2 Level 4. The device operates from −30 °C to +85 °C ambient with junction temperatures up to +125 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
Common mode attenuation	≥20 dB at 900 MHz and 1.8 GHz - suppresses radiated emissions from USB cable common mode currents
Data line V_BR	6 V @ 1 mA - ensures reliable stand-off below USB 2.0 5.5 V signaling margin
VBUS V_BR	16.5 V typ. - protects against 16 V transient overvoltage without false triggering
DC serial resistance	3–4 Ω per D+/D− line - minimizes insertion loss and voltage drop in 480 Mbps data paths
ESD rating	±8 kV contact / ±15 kV air (IEC 61000-4-2 Level 4) - meets industrial and consumer immunity requirements
Package height	<0.55 mm - enables ultra-thin mobile and wearable PCB stacking
Bandwidth	>6 GHz - preserves USB 2.0 eye diagram integrity with minimal high-frequency distortion

Pinout & Package

ECMF02-4CMX8 uses a micro QFN-8L (µQFN-8L) package measuring 2.50 mm × 1.20 mm × 0.50 mm max, with wettable flanks and RoHS2-compliant ECOPACK construction. Pin 1 is marked by a dot; the package is lead-free and halogen-free.

Pin/Terminal	Circuit Role	Design Meaning
1	D+ input	High-impedance differential data input; routed directly to downstream USB PHY
2	D− input	Complementary differential data input; maintains 90 Ω differential impedance
3	GND	Common reference for ESD clamp return and common mode choke center tap
4	VBUS	Protected 5 V power rail input; clamped to ≤24 V under 2.5 A ESD pulse
5	ID	OTG identification pin protection; 6 V breakdown enables legacy USB-A/B role detection
6	GND	Second ground terminal for thermal and EMI performance; must be connected to main GND plane
7	D+ output	Filtered, ESD-clamped D+ signal output; matches input timing within 10 ps skew
8	D− output	Filtered, ESD-clamped D− signal output; maintains differential symmetry with Pin 7

Key Features

Feature	Design Value
Integrated common mode filter + ESD protection	Single-device replacement for discrete CM choke + 4× TVS array - reduces BOM count and layout area by >60%
Bidirectional ESD protection on all lines	Enables audio-over-USB 2.0 support without polarity-sensitive routing or external diode directioning
Optimized flow-through footprint	Input/output pins aligned on opposite edges - eliminates trace stubs and impedance discontinuities in USB 2.0 routing
High common mode attenuation at RF bands	20+ dB suppression at 900 MHz/1.8 GHz - mitigates cellular band interference coupling into USB cables
Ultra-low profile packaging	0.50 mm typical height - fits beneath 0.6 mm board-to-board connectors in foldable phones and dongles

Applications

USB 2.0 Mobile Host Interface

USB OTG Peripheral Adapter

Use Scenario: Smartphone acting as USB host for flash drives or keyboards via micro-AB receptacle.

IC Role / Device Role: Common mode filter and ESD protector on D+/D−/VBUS/ID lines between USB controller and connector.

Use Value: Prevents ESD-induced PHY lockup during hot-plug and suppresses 900 MHz GSM noise coupling into differential data lanes.

Use Scenario: USB-C to micro-B adapter enabling OTG audio playback from Android tablet to analog headset.

IC Role / Device Role: Bidirectional ESD clamp and common mode choke on ID pin and data lines to preserve role detection integrity.

Use Value: Maintains correct ID pin voltage level during ESD events, ensuring stable peripheral/host negotiation without reset.

Industrial USB 2.0 Camera Module

USB 2.0 Docking Station Port

Use Scenario: Embedded vision system using USB 2.0 for uncompressed video streaming over 1.5 m cable.

IC Role / Device Role: Signal-conditioning front-end protecting image sensor SoC USB transceiver from cable-borne transients.

Use Value: Delivers >6 GHz bandwidth and <0.5 dB insertion loss - preserves eye opening per USB-IF mask #1 at 480 Mbps.

Use Scenario: Multi-port docking station with shared VBUS switching and simultaneous USB 2.0 peripherals.

IC Role / Device Role: Per-port ESD and common mode filtering on each downstream USB 2.0 channel before hub controller.

Use Value: Enables independent port-level ESD hardening without cross-talk between channels or VBUS droop during surge events.

Equivalent & Alternatives

The following parts are listed as comparable options for similar USB 2.0 interface protection applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPD2EUSB30DRYR	Lower common mode attenuation (12 dB @ 1.8 GHz); no integrated CM choke - requires external ferrite bead	Limited RF noise suppression in cellular-band-dense environments	Prefer when board space allows discrete CM filtering and cost sensitivity outweighs RF performance
IP4283CZ10	Higher DC resistance (6 Ω per line); 8-pin TSSOP package (1.2 mm height)	Not suitable for ultra-thin designs; higher insertion loss degrades eye height at 480 Mbps	Choose only if existing TSSOP footprint reuse is mandatory and height budget ≥1.0 mm

Compared with TPD2EUSB30DRYR and IP4283CZ10, the ECMF02-4CMX8 uniquely combines integrated common mode filtering, sub-0.55 mm height, and >20 dB RF attenuation - making it optimal for space-constrained, noise-sensitive USB 2.0 endpoints where signal integrity and ESD robustness are co-critical.

Availability

ECMF02-4CMX8 is available at Aetrix Electronics and suitable for USB 2.0 mobile host interfaces, industrial camera modules, and docking station ports requiring stable component supply, long-term lifecycle assurance, and RoHS2-compliant sourcing.

Supply support for ECMF02-4CMX8 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, MCU, power, and sensing solutions for automotive, industrial, and consumer markets.

The ECMF02-4CMX8 belongs to ST's EMI Filter & Protection product line, engineered specifically for high-speed digital interface hardening - balancing RF filtering, ESD robustness, and minimal signal degradation in USB, HDMI, and MIPI applications.

FAQ

What is the maximum operating temperature for ECMF02-4CMX8?

The ECMF02-4CMX8 has an operating ambient temperature range of −30 °C to +85 °C, with a maximum junction temperature of +125 °C. Thermal design must ensure that power dissipation from ESD pulses and DC leakage does not exceed this limit - typical steady-state power dissipation is negligible (<10 µW) under normal operation.

Does ECMF02-4CMX8 require external bias or control signals?

No. The ECMF02-4CMX8 is a fully passive, unpowered device. It contains no active circuitry, regulators, or enable pins. All protection and filtering functions operate inherently through its integrated silicon TVS diodes and planar common mode choke structure - requiring zero external components or configuration.

Can ECMF02-4CMX8 be used with USB 3.0 or USB-C interfaces?

No. The ECMF02-4CMX8 is characterized and qualified exclusively for USB 2.0 (480 Mbps) signal integrity and ESD protection. Its common mode choke cutoff and parasitic capacitance are not optimized for SuperSpeed differential pairs (5 Gbps), and it lacks pins for USB-C CC or SBU lines. Use ST's USB3-specific filters (e.g., ECMF04-4CMX8) for Gen1/Gen2 interfaces.

How is the ECMF02-4CMX8 footprint aligned for USB 2.0 layout best practices?

The ECMF02-4CMX8 uses a flow-through pinout: D+ and D− inputs (Pins 1,2) and outputs (Pins 7,8) are placed on opposite short edges, enabling straight-through routing with no vias or stubs. This preserves 90 Ω differential impedance, minimizes crosstalk, and aligns with USB-IF layout guidelines for high-speed signal integrity.

ECMF02-4CMX8 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Package/Case:: 8-UFDFN

Filter Type:: Signal Line

Number of Lines:: 2

Impedance @ Frequency:: -

Current Rating (Max):: -

DC Resistance (DCR) (Max):: -

Voltage Rating - DC:: 4Ohm

Voltage Rating - AC:: -

Operating Temperature:: -

Ratings:: -40°C ~ 125°C

Approval Agency:: -

Features:: -

Mounting Type:: TVS Diode ESD Protection

Size / Dimension:: -

Height (Max):: -

ECMF02-4CMX8 FAQ

1.How can I place an order for ECMF02-4CMX8 through Aetrix?

Please submit a Request for Quotation (RFQ) for ECMF02-4CMX8 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 ECMF02-4CMX8 reliable?

The price and inventory of ECMF02-4CMX8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ECMF02-4CMX8 is usually 5 days.

3.What payment methods are accepted for ECMF02-4CMX8?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ECMF02-4CMX8 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ECMF02-4CMX8?

ECMF02-4CMX8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ECMF02-4CMX8 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 ECMF02-4CMX8?

For technical support, including ECMF02-4CMX8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ECMF02-4CMX8 requirements.

6.How does Aetrix verify that ECMF02-4CMX8 is sourced from the original manufacturer or authorized distributors?

All ECMF02-4CMX8 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 ECMF02-4CMX8 meets industry standards.

7.What is the process for return or replacement of ECMF02-4CMX8?

All ECMF02-4CMX8 units undergo pre-shipment inspection (PSI). If there is an issue with ECMF02-4CMX8, 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 ECMF02-4CMX8 part is unused and in its original packaging.

Return procedure for ECMF02-4CMX8:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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