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Home > Products > Integrated Circuits (ICs) > Interface > Analog Switches - Special Purpose

STMicroelectronics STG3696EQTR

Name: STG3696EQTR
Brand: STMicroelectronics
SKU: STG3696EQTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STG3696EQTR

Manufacturer:: STMicroelectronics

Category:: Analog Switches - Special Purpose

Package:: 10-UFQFN

Datasheet:: STG3696EQTR.pdf

Description:: IC SWITCH SPDT USB/AUDIO 10-QFN

Quantity:: RFQ Add To RFQ list

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Inventory:4,811

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Product details

Overview

STG3696EQTR from STMicroelectronics is a low-voltage dual SPDT analog switch optimized for concurrent USB 2.0 high-speed (480 Mbps) and bidirectional audio signal routing in mobile devices. It features 2.5 Ω typical R_ON, ±8 kV HBM ESD protection on COM pins, 950 MHz –3 dB bandwidth, auto VBUS detection for seamless mode switching, and negative-swing audio capability down to V_CC – 5.0 V - enabling ground-referenced headphone amplifiers without external charge pumps.

For engineers reviewing the STG3696EQTR datasheet, STG3696EQTR pinout, STG3696EQTR application, or STG3696EQTR equivalent, this device addresses critical coexistence challenges between high-speed digital and high-fidelity analog paths in space-constrained portable designs - particularly where pop-noise suppression, fault tolerance to 5.5 V overvoltage, and channel-to-channel crosstalk below –70 dB are mandatory.

Technical Context

The STG3696E integrates two independent SPDT switches sharing common COM1/COM2 terminals, each configurable via VBUS voltage sensing or AOVR override control. Its internal negative charge pump enables true rail-to-rail audio signal handling including sub-ground excursions, while dedicated shunt resistors (200 Ω) discharge floating AUn lines to suppress pop/click noise during switching transitions.

Fault protection activates when COMn voltage exceeds V_OVDT (V_CC + 0.35 V), disconnecting channels within 1.3 µs and recovering in under 55 µs. USB path maintains <8 pF on-capacitance and <5 Ω R_ON matching (±0.5 Ω), meeting USB 2.0 eye diagram integrity requirements at 480 Mbps.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.7 V to 4.5 V - supports single-supply operation from Li-ion battery or LDO rails without level-shifting.
R_ON (Audio)	2.4 Ω typ. - ensures minimal insertion loss and THD+N < 0.05% across 20 Hz–20 kHz audio band.
R_ON (USB)	2.4 Ω typ. - preserves signal integrity for USB 2.0 differential pairs with <0.5 Ω matching between channels.
Bandwidth (–3 dB)	950 MHz - accommodates full USB 2.0 spectral content and harmonics without attenuation.
ESD Protection	±8 kV HBM on COM pins - eliminates need for external TVS diodes in handheld ESD-prone interfaces.
Crosstalk	–70 dB @ 100 kHz - prevents audible leakage between left/right audio channels or USB/data coupling.
Pop Noise Suppression	Integrated 200 Ω shunt resistors - actively discharge AUn nodes during idle state to eliminate transient transients.

Pinout & Package

STG3696EQTR uses a 10-pin QFN package (1.8 mm × 1.4 mm × 0.5 mm, 0.4 mm pitch) with wettable flanks and exposed thermal pad. Pin 1 is marked by a dot at top-left corner (TLC).

Pin/Terminal	Circuit Role	Design Meaning
1 (USB1)	USB data channel 1 input	Connects to D+ or D– of upstream USB transceiver; withstands 5.5 V fault events.
2 (AU2)	Audio channel 2 input	Supports negative swing to V_CC – 5.0 V; internally shunted when unselected.
3 (AU1)	Audio channel 1 input	Primary left/right audio path; identical electrical behavior to AU2.
4 (GND)	Digital/analog reference ground	Common return for all signals; must be connected to low-impedance PCB ground plane.
5 (V_CC)	Positive supply	Powers internal charge pump, logic, and switch arrays; bypass capacitor required.
6 (COM1)	Common output 1	Shared node for USB1/AU1 selection; connects to connector or codec interface.
7 (COM2)	Common output 2	Shared node for USB2/AU2 selection; electrically isolated from COM1.
8 (AOVR)	Audio override enable	High = force audio path; low = enable automatic VBUS-triggered switching.
9 (VBUS)	USB power detection input	Threshold at 0.5×V_CC; triggers reconfiguration without external comparator.
10 (USB2)	USB data channel 2 input	Second USB differential line; matched impedance and timing to USB1.

Key Features

Feature	Design Value
Auto VBUS detection	Eliminates external voltage monitor IC and reduces BOM count in dual-mode USB/audio accessories.
Negative rail audio support	Enables direct connection to Class AB headphone amplifiers without external negative supply generation.
Integrated pop-noise shunts	200 Ω internal resistors discharge floating audio inputs, removing need for discrete RC networks.
USB 2.0 fault protection	Withstands 5.5 V overvoltage on COM pins per USB specification, protecting downstream PHYs.
Low R_ON flatness	0.03 Ω (audio), 0.05 Ω (USB) - ensures consistent gain and impedance across full signal swing range.

Applications

Smartphone Audio/USB Switching

USB-C Docking Adapter

Use Scenario: Simultaneous headphone playback and USB data transfer in compact smartphones using shared physical connector.

IC Role / Device Role / Timing Role: Dual SPDT switch dynamically routes COM1/COM2 between AU1/AU2 and USB1/USB2 based on VBUS presence.

Use Value: Enables single USB-C port to serve as both audio jack and data interface without mechanical switching or user intervention.

Use Scenario: Multi-function docking station supporting audio output, USB 2.0 peripherals, and charging through one upstream port.

IC Role / Device Role / Timing Role: Isolates audio DAC outputs from USB data lines while maintaining signal integrity during hot-plug events.

Use Value: Prevents USB packet corruption and audio artifacts during concurrent use, validated at 480 Mbps with <8 pF C_ON.

Portable Media Player

USB OTG Audio Interface

Use Scenario: MP3 player with integrated line-out and USB mass storage mode sharing same micro-USB connector.

IC Role / Device Role / Timing Role: Switches analog audio path to 3.5 mm jack when no VBUS detected; reconfigures to USB data path upon host connection.

Use Value: Achieves zero-pop switching with <5 µs t_OFF and <85 µs t_ON, eliminating audible clicks during mode transition.

Use Scenario: Android OTG accessory that adds stereo audio input/output while retaining USB host functionality.

IC Role / Device Role / Timing Role: Routes microphone/line-in signals to codec while allowing simultaneous USB enumeration and HID communication.

Use Value: Maintains <–65 dB off-isolation to prevent USB noise coupling into sensitive analog input paths.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual SPDT USB/audio switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TS5USBA225RSER	No integrated negative charge pump; audio swing limited to GND–V_CC; lower ESD (±4 kV HBM).	Requires external biasing for true ground-referenced audio; unsuitable for sub-ground headphone drivers.	Select only if system uses AC-coupled audio or has external negative rail.
MAX4989ETE+	Higher R_ON (4.5 Ω typ.), no VBUS auto-detect; requires GPIO-controlled mode selection.	Needs additional MCU pin and firmware logic for USB/audio arbitration; larger 16-pin TQFN package.	Choose when precise timing control over switching sequence is required over automatic detection.

Compared with TS5USBA225RSER and MAX4989ETE+, STG3696EQTR uniquely combines VBUS-triggered auto-switching, integrated negative rail generation, and ±8 kV ESD in a 10-pin QFN - reducing component count and PCB area while enabling robust dual-mode operation without software intervention.

Availability

STG3696EQTR is available at Aetrix Electronics and suitable for smartphone audio routing, USB-C docking adapters, and portable media players requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for STG3696EQTR 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, Switzerland, designing and manufacturing microcontrollers, power management ICs, sensors, and analog switches for industrial, automotive, and consumer markets.

The STG3696E belongs to ST's high-performance analog switch portfolio targeting mobile connectivity, where low R_ON, ultra-low capacitance, and integrated protection features address stringent size, power, and reliability requirements of handheld USB/audio interfaces.

FAQ

What is the maximum allowable voltage on the COM pins during overvoltage fault conditions?

The COM pins tolerate up to 5.5 V in overvoltage fault conditions per USB 2.0 specification. When voltage exceeds V_OVDT (V_CC + 0.35 V), the internal protection circuit disconnects the channel within 1.3 µs to safeguard downstream components like USB transceivers or audio codecs.

How does the internal negative charge pump operate, and what are its limitations?

The integrated negative charge pump generates a local negative rail enabling audio signals to swing down to V_CC – 5.0 V on AU1/AU2 pins. It operates automatically when audio path is selected and AOVR is high or VBUS is absent. The pump is disabled during USB mode to avoid interference; applying negative voltage to AUn pins during fault protection activation may damage the device.

Can STG3696EQTR be used in systems without VBUS detection capability?

Yes - driving AOVR high forces permanent audio path selection regardless of VBUS state. This allows manual control in systems lacking VBUS monitoring, such as legacy USB-A docks or standalone audio accessories. In this mode, USB1/USB2 pins remain inactive but retain full 5.5 V fault tolerance.

What layout guidelines are critical for maintaining 950 MHz bandwidth and low crosstalk?

Route COM1/COM2 traces differentially with controlled 50 Ω impedance; separate USB and audio paths with ground guard traces; place 100 nF V_CC bypass capacitor within 2 mm of pin 5; connect exposed thermal pad to solid ground plane using ≥4 thermal vias; avoid stubs longer than 1 mm on any high-speed line.

STG3696EQTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 10-UFQFN

Packaging:: Tape & Reel (TR)

Product Status:: Active

Applications:: Audio, USB

Multiplexer/Demultiplexer Circuit:: 2:1

Switch Circuit:: SPDT

Number of Channels:: 2

On-State Resistance (Max):: 5Ohm

Voltage - Supply, Single (V+):: 2.7V ~ 4.5V

Voltage - Supply, Dual (V±):: -

-3db Bandwidth:: 850MHz

Features:: USB 2.0

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 10-QFN (1.8x1.4)

STG3696EQTR FAQ

1.How can I place an order for STG3696EQTR through Aetrix?

Please submit a Request for Quotation (RFQ) for STG3696EQTR 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 STG3696EQTR reliable?

The price and inventory of STG3696EQTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STG3696EQTR is usually 5 days.

3.What payment methods are accepted for STG3696EQTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STG3696EQTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STG3696EQTR?

STG3696EQTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STG3696EQTR 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 STG3696EQTR?

For technical support, including STG3696EQTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STG3696EQTR requirements.

6.How does Aetrix verify that STG3696EQTR is sourced from the original manufacturer or authorized distributors?

All STG3696EQTR 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 STG3696EQTR meets industry standards.

7.What is the process for return or replacement of STG3696EQTR?

All STG3696EQTR units undergo pre-shipment inspection (PSI). If there is an issue with STG3696EQTR, 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 STG3696EQTR part is unused and in its original packaging.

Return procedure for STG3696EQTR:

1.Submit a request within 90 days.

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

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