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Home > Products > Integrated Circuits (ICs) > Interface > Analog Switches, Multiplexers, Demultiplexers

STMicroelectronics STG3689DTR

Name: STG3689DTR
Brand: STMicroelectronics
SKU: STG3689DTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STG3689DTR

Manufacturer:: STMicroelectronics

Category:: Analog Switches, Multiplexers, Demultiplexers

Package:: 10-UFDFN

Datasheet:: STG3689DTR.pdf

Description:: IC SWITCH SPDTX2 700MOHM 10TDFN

Quantity:: RFQ Add To RFQ list

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Inventory:3,737

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Product details

Overview

STG3689DTR from STMicroelectronics is a low-voltage, dual SPDT analog switch fabricated in C2MOS technology, operating from 1.65V to 4.3V single supply. It features 0.7Ω max R_ON at V_CC = 4.3V, 0.2µA max I_CC at 85°C, and break-before-make timing (2–15ns), enabling precision signal routing in battery-powered portable systems such as audio multiplexing and sensor interface circuits.

For engineers reviewing the STG3689DTR datasheet, STG3689DTR pinout, STG3689DTR application, or STG3689DTR equivalent, key selection criteria include guaranteed R_ON flatness (≤0.21Ω), 4.3V-tolerant 1.8V-compatible control inputs, -90dB off-isolation at 100kHz, and TDFN10 package thermal performance for space-constrained PCB layouts.

Technical Context

The STG3689 implements two independent SPDT switches with complementary control logic: each IN input drives one S1 channel ON while simultaneously driving its paired S2 channel OFF, ensuring break-before-make operation. The internal architecture uses silicon-gate CMOS transistors optimized for low R_ON and minimal charge injection (23–44pC).

It supports rail-to-rail analog signal switching up to 85MHz bandwidth (RL = 50Ω), with DC-coupled operation across the full 0–V_CC range. Input protection includes ESD immunity >2kV HBM and latch-up immunity exceeding 300mA per JESD17.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	1.65V to 4.3V single supply - enables direct integration with 1.8V/2.5V/3.3V/4.3V logic and analog domains without level shifters
R_ON (Max)	0.7Ω at V_CC = 4.3V, T_A = 25°C - minimizes signal attenuation and distortion in high-fidelity audio paths
I_CC (Max)	0.2µA at T_A = 85°C - ensures ultra-low standby power for always-on sensor nodes and wearables
OIRR	-90dB at f = 100kHz - prevents crosstalk between active and inactive channels in multi-signal acquisition
t_D (Break-Before-Make)	2–15ns depending on V_CC - eliminates momentary short-circuit risk during channel switching in power-sensitive analog front-ends
Q (Charge Injection)	23pC at V_GEN = 0V, V_CC = 1.65–1.95V - reduces voltage glitch on sampled-hold capacitors in precision ADC interfaces

Pinout & Package

TDFN10 (2.5mm × 1.3mm) 10-pin wettable flank package with exposed thermal pad; RoHS-compliant, ECOPACK® certified, rated for -55°C to +125°C operating temperature.

Pin/Terminal	Circuit Role	Design Meaning
1	V_CC	Positive supply rail - powers internal logic and switch transistors; must be decoupled within 1mm of pin
2, 4, 7, 9	1S1, 1S2, 2S1, 2S2	Analog source terminals - bidirectional, rail-to-rail capable; matched R_ON ≤0.6Ω ensures channel consistency
3, 8	D1, D2	Common analog ports - serve as shared outputs for SPDT configuration; capacitance 99pF affects high-frequency settling
5, 10	1IN, 2IN	Digital control inputs - 4.3V-tolerant with 1.8V-compatible thresholds; drive strength sufficient for 10pF load at 100MHz
6	GND	Signal and power ground reference - requires low-inductance connection to minimize switching noise coupling

Key Features

Feature	Design Value
Break-before-make timing	Guaranteed 2–15ns delay prevents transient shorts during channel transitions in analog signal chains
R_ON flatness	≤0.21Ω variation over full 0–V_CC signal range - preserves linearity in precision instrumentation amplifiers
Ultra-low leakage	±10nA I_OFF at V_S = 0.3V/4V - maintains accuracy in high-impedance sensor bias networks
ESD robustness	HBM >2kV on analog channels vs. GND - eliminates need for external TVS diodes in handheld medical devices

Applications

Audio Signal Routing

Portable Sensor Multiplexing

Use Scenario: Switching between multiple microphones or headphone outputs in Bluetooth earbuds.

IC Role / Device Role / Timing Role: Dual SPDT analog switch providing low-distortion, low-noise path selection with break-before-make to prevent pop/click artifacts.

Use Value: 0.7Ω R_ON and -90dB off-isolation preserve SNR >95dB; 0.2µA quiescent current extends battery life beyond 100 hours.

Use Scenario: Selecting among temperature, humidity, and accelerometer signals feeding a single ADC input in IoT edge nodes.

IC Role / Device Role / Timing Role: Low-leakage analog multiplexer enabling sequential sampling without cross-channel contamination.

Use Value: ±10nA I_OFF prevents bias current errors in 10MΩ sensor bridges; 85MHz bandwidth supports fast settling for 1MSPS sampling.

USB-C Analog Accessory Detection

Low-Power Medical Front-End

Use Scenario: Detecting and routing analog audio signals from USB-C accessories (e.g., headsets) in smartphones.

IC Role / Device Role / Timing Role: Voltage-tolerant analog switch interfacing 1.8V control logic with 3.3V accessory lines while maintaining signal integrity.

Use Value: 4.3V-tolerant inputs eliminate level-shifter ICs; R_ON flatness <0.21Ω ensures consistent THD <0.03% across all configurations.

Use Scenario: Isolating ECG electrode inputs during lead-off detection or calibration sequences in wearable monitors.

IC Role / Device Role / Timing Role: Precision analog switch enabling safe, low-noise disconnection of biopotential inputs without injecting charge into sensitive amplifier nodes.

Use Value: 23pC charge injection prevents >1mV baseline shifts; -55°C to +125°C rating supports clinical-grade environmental validation.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual SPDT analog switch applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TMUX1574DRYR	R_ON = 0.5Ω (typ) at 3.3V but no break-before-make guarantee; higher I_CC = 1µA	Lacks guaranteed t_D; unsuitable where short-circuit prevention is safety-critical	Select only if R_ON priority outweighs timing safety; verify system-level fault tolerance
ADG732BRUZ	32-channel, not dual SPDT; R_ON = 4Ω (max); no 1.8V-compatible control	Designed for high-channel-count industrial PLCs, not portable low-power systems	Reject for portable use - incompatible voltage thresholds and excessive R_ON degrade audio fidelity

Compared with TMUX1574DRYR and ADG732BRUZ, STG3689DTR uniquely combines guaranteed break-before-make timing, sub-1Ω R_ON, and 1.8V-compatible 4.3V-tolerant controls - making it the only viable option for space-constrained, battery-operated analog routing requiring both precision and safety.

Availability

STG3689DTR is available at Aetrix Electronics and suitable for portable audio subsystems, IoT sensor hubs, USB-C accessory interfaces, and wearable medical front-ends requiring stable component supply through extended product lifecycles.

Supply support for STG3689DTR 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, delivering intelligent power, analog, MEMS, and microcontroller solutions for industrial, automotive, and consumer markets.

The STG3689 belongs to ST's low-voltage analog switch product line, engineered specifically for energy-efficient portable electronics where rail-to-rail signal integrity, ultra-low standby power, and compact packaging are mandatory design constraints.

FAQ

What is the maximum analog signal voltage that can be applied to the S1/S2 or D pins?

The absolute maximum analog signal voltage is -0.5V to V_CC + 0.5V per the datasheet's "Absolute Maximum Ratings" table. For reliable operation, signals must remain within 0V to V_CC under recommended conditions - e.g., at V_CC = 3.3V, the usable analog range is 0–3.3V. Exceeding this risks latch-up or permanent damage.

Does STG3689DTR support simultaneous switching of both channels?

Yes - both 1IN and 2IN control inputs operate independently, allowing concurrent activation of 1S1/D1 and 2S1/D2 paths. However, each channel maintains strict break-before-make behavior internally; no cross-talk or timing dependency exists between the two SPDT sections.

Is the TDFN10 package compatible with standard reflow profiles for lead-free soldering?

Yes - the STG3689DTR's ECOPACK®-certified TDFN10 package complies with JEDEC J-STD-020D moisture sensitivity level 1 and supports peak reflow temperatures up to 260°C for 30 seconds. Its wettable flanks enable automated optical inspection (AOI) of solder joints.

Can STG3689DTR be used in bidirectional signal paths without performance degradation?

Yes - the device is fully bidirectional: R_ON, charge injection, and bandwidth specifications apply equally regardless of signal direction. The C2MOS process ensures symmetrical conduction characteristics, and the truth table confirms identical ON/OFF behavior for source-to-drain and drain-to-source configurations.

STG3689DTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Switch Circuit:: SPDT

Multiplexer/Demultiplexer Circuit:: 2:1

Number of Circuits:: 2

On-State Resistance (Max):: 700mOhm

Channel-to-Channel Matching (ΔRon):: 600mOhm

Voltage - Supply, Single (V+):: 1.65V ~ 4.3V

Voltage - Supply, Dual (V±):: -

Switch Time (Ton, Toff) (Max):: 50ns, 30ns

-3db Bandwidth:: 85MHz

Charge Injection:: 44pC

Channel Capacitance (CS(off), CD(off)):: 7pF

Current - Leakage (IS(off)) (Max):: 10nA

Crosstalk:: -76dB @ 100kHz

Operating Temperature:: -55°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 10-TDFN (2.5x1.4)

STG3689DTR FAQ

1.How can I place an order for STG3689DTR through Aetrix?

Please submit a Request for Quotation (RFQ) for STG3689DTR 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 STG3689DTR reliable?

The price and inventory of STG3689DTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STG3689DTR is usually 5 days.

3.What payment methods are accepted for STG3689DTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STG3689DTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STG3689DTR?

STG3689DTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STG3689DTR 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 STG3689DTR?

For technical support, including STG3689DTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STG3689DTR requirements.

6.How does Aetrix verify that STG3689DTR is sourced from the original manufacturer or authorized distributors?

All STG3689DTR 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 STG3689DTR meets industry standards.

7.What is the process for return or replacement of STG3689DTR?

All STG3689DTR units undergo pre-shipment inspection (PSI). If there is an issue with STG3689DTR, 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 STG3689DTR part is unused and in its original packaging.

Return procedure for STG3689DTR:

1.Submit a request within 90 days.

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

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