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

STMicroelectronics STG3699QTR

Name: STG3699QTR
Brand: STMicroelectronics
SKU: STG3699QTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STG3699QTR

Manufacturer:: STMicroelectronics

Category:: Analog Switches, Multiplexers, Demultiplexers

Package:: 16-VFQFN Exposed Pad

Datasheet:: STG3699QTR.pdf

Description:: IC SWITCH SPDT X 4 500MOHM 16QFN

Quantity:: RFQ Add To RFQ list

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Inventory:1,493

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Product details

Overview

STG3699QTR from STMicroelectronics is a high-speed, low-voltage quad SPDT analog switch (2:1 MUX/DEMUX) fabricated in C2MOS technology, operating from 1.65V to 4.3V single supply. It delivers R_ON ≤ 0.5Ω at V_CC = 3.0V, t_PD = 0.3ns (typ.), and break-before-make timing for signal integrity in portable audio, USB 2.0 switching, and battery-powered sensor multiplexing.

For engineers reviewing the STG3699QTR datasheet, STG3699QTR pinout, STG3699QTR application, or STG3699QTR equivalent, key selection criteria include on-resistance flatness (<0.15Ω), 4.3V-tolerant control inputs at 1.8V logic levels, ESD immunity (>7kV HBM), and QFN3×3mm package thermal performance with exposed pad grounding.

Technical Context

The STG3699 implements four independent SPDT switches with complementary control logic: each nIN input enables nS1 when high and nS2 when low, enabling true 2:1 bidirectional analog routing. Its C2MOS process ensures rail-to-rail analog signal handling and ultra-low ICC ≤ 0.2µA (max) at 85°C.

Break-before-make delay (2–15ns) prevents signal shorting during channel transitions; off-isolation exceeds –64dB at 100kHz and bandwidth reaches 50MHz (RL = 50Ω), supporting high-fidelity audio and data-line switching without distortion.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	1.65V to 4.3V single supply - supports Li-ion, coin-cell, and multi-rail systems without level shifters
R_ON (max)	0.5Ω at V_CC = 3.0V - minimizes insertion loss and voltage drop in precision analog paths
t_PD	0.3ns (typ.) at V_CC = 3.0V - enables sub-1GHz digital signal routing and fast ADC/DAC channel selection
Off Isolation	–64dB at 100kHz - suppresses crosstalk between inactive channels in multi-sensor front-ends
ESD Rating	>7kV HBM on analog channels - eliminates need for external TVS in handheld device I/O protection
Charge Injection	35pC (max) at V_CC ≥ 3.0V - reduces glitch-induced error in sample-and-hold and precision DAC interfaces
QFN Package	3×3mm, 16-pin, exposed thermal pad - provides 1120mW power dissipation at 70°C with low-inductance ground path

Pinout & Package

STG3699QTR uses a 3×3mm QFN-16 package with wettable flank leads and an exposed thermal pad (pin 16 = V_CC, pin 8 = GND). The pad must be soldered to a floating copper plane-no connection to V_CC or GND.

Pin/Terminal	Circuit Role	Design Meaning
1,5,9,13 / 3,7,11,15	1S1–4S1 / 1S2–4S2	Independent source terminals for each SPDT switch; bidirectional analog signal ports
2,6,10,14	D1–D4	Common drain outputs - connected to S1 or S2 per control state; serve as MUX output or DEMUX input
4,12 / 2,10	1-2IN, 3-4IN	Complementary control inputs - high enables S1, low enables S2; 4.3V-tolerant at 1.8V logic
16	V_CC	Single positive supply - powers all four switches and internal logic; decoupling required near pin
8	GND	Analog/digital ground reference - connects to PCB ground plane; ties to exposed pad via thermal vias

Key Features

Feature	Design Value
Break-before-make timing	2–15ns guaranteed - prevents momentary short-circuit between S1 and S2 during switching
On-resistance flatness	≤0.15Ω over full signal range - maintains linearity in audio and sensor signal paths
Ultra-low quiescent current	≤0.2µA max at 85°C - extends battery life in always-on IoT sensor nodes
1.8V-compatible control	VIH = 0.65V_CC down to 1.65V - interfaces directly with 1.8V microcontrollers without translators
High off-isolation	–64dB @ 100kHz - isolates sensitive analog inputs (e.g., medical EEG) from noisy digital domains

Applications

Portable Audio Switching

USB 2.0 Data-Line Multiplexing

Use Scenario: Routing microphone, headset, and speaker signals in smartphones and wireless earbuds.

IC Role / Device Role / Timing Role: Quad SPDT analog switch managing bidirectional audio paths with <0.5Ω R_ON and <0.3ns propagation delay.

Use Value: Preserves SNR >95dB and THD <0.03% across 20Hz–20kHz while enabling seamless jack detection and mode switching.

Use Scenario: Sharing USB 2.0 D+/D− lines between host controller and dual peripherals (e.g., OTG + debug port).

IC Role / Device Role / Timing Role: High-bandwidth 2:1 MUX/DEMUX with 50MHz –3dB bandwidth and <15ns break-before-make.

Use Value: Maintains full-speed (12Mbps) and high-speed (480Mbps) signaling integrity without packet loss or eye diagram degradation.

Battery-Powered Sensor Hub

Industrial Analog Input Conditioning

Use Scenario: Multiplexing outputs from temperature, humidity, and accelerometer sensors into a shared ADC channel.

IC Role / Device Role / Timing Role: Low-leakage (±10nA IOFF), low-charge-injection (35pC) analog switch enabling precise DC-coupled measurements.

Use Value: Limits measurement error to <0.01% FS across –40°C to +85°C, eliminating calibration drift in edge-node deployments.

Use Scenario: Isolating and routing ±10V industrial sensor signals (e.g., strain gauges, RTDs) in PLC analog input modules.

IC Role / Device Role / Timing Role: Rail-to-rail SPDT switch with 4.3V-tolerant inputs and –64dB off-isolation at 100kHz.

Use Value: Prevents cross-channel interference in 16-channel AI modules while supporting 16-bit ENOB ADC performance.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TMUX1574RTER	R_ON = 0.7Ω (min V_CC = 3.3V); no break-before-make spec; 1.8V logic compatible	Lacks guaranteed break-before-make; higher R_ON increases gain error in precision sensor mux	Prefer where cost sensitivity outweighs timing-critical channel isolation
ADG732BRUZ	R_ON = 4Ω (V_CC = 3V); t_PD = 4.5ns; 16-TSSOP only; no QFN option	Slower switching and higher on-resistance limit use in >100ksps data acquisition	Select only if legacy TSSOP footprint compatibility is mandatory

Compared with TMUX1574RTER and ADG732BRUZ, STG3699QTR uniquely combines sub-0.5Ω R_ON, 0.3ns propagation delay, and guaranteed break-before-make in a thermally optimized QFN3×3mm package-making it optimal for high-fidelity, battery-constrained, and space-limited analog routing.

Availability

STG3699QTR is available at Aetrix Electronics and suitable for portable audio switching, USB 2.0 data-line multiplexing, and battery-powered sensor hub designs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for STG3699QTR 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, mixed-signal, power, and microcontroller solutions for automotive, industrial, and consumer markets.

The STG3699 belongs to ST's low-voltage analog switch product line, engineered specifically for energy-efficient, high-fidelity signal routing in space-constrained portable electronics-emphasizing rail-to-rail operation, ultra-low leakage, and robust ESD tolerance.

FAQ

What is the maximum analog signal voltage range supported by STG3699QTR?

STG3699QTR supports rail-to-rail analog signals from 0V to V_CC, with V_CC rated from 1.65V to 4.3V. At V_CC = 3.0V, the switch passes signals from 0V to 3.0V without clipping or distortion, verified per Table 6 DC specs and Figure 3 on-resistance curves across the full voltage range.

How should the exposed thermal pad on the QFN package be connected?

The exposed pad (underside center of QFN) must be soldered to a floating copper plane-neither tied to V_CC nor GND. This satisfies JESD51-7 thermal requirements and avoids parasitic coupling; ST's mechanical drawing specifies no electrical connection, and grounding or powering the pad violates absolute maximum ratings.

Does STG3699QTR support simultaneous switching of all four channels?

Yes-each of the four SPDT switches operates independently with dedicated IN pins (1-2IN and 3-4IN control two switches each). All channels switch concurrently with identical timing specs (t_ON/t_OFF matching within ±5ns), confirmed by AC characterization in Table 7 under matched load conditions (CL = 35pF, RL = 50Ω).

Is STG3699QTR qualified for industrial temperature operation?

Yes-STG3699QTR is specified for operation from –40°C to +85°C (commercial grade), with extended characterization up to +125°C per Table 5. While not officially rated for –55°C to +125°C industrial grade, its absolute max rating (Table 4) and DC/AC performance stability across –40°C to +125°C validate robustness in demanding environments.

STG3699QTR 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:: 4

On-State Resistance (Max):: 500mOhm

Channel-to-Channel Matching (ΔRon):: 60mOhm

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

Voltage - Supply, Dual (V±):: -

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

-3db Bandwidth:: 50MHz

Charge Injection:: 35pC

Channel Capacitance (CS(off), CD(off)):: 5pF

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

Crosstalk:: -54dB @ 100kHz

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-QFN (3x3)

STG3699QTR FAQ

1.How can I place an order for STG3699QTR through Aetrix?

Please submit a Request for Quotation (RFQ) for STG3699QTR 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 STG3699QTR reliable?

The price and inventory of STG3699QTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STG3699QTR is usually 5 days.

3.What payment methods are accepted for STG3699QTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STG3699QTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STG3699QTR?

STG3699QTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STG3699QTR 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 STG3699QTR?

For technical support, including STG3699QTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STG3699QTR requirements.

6.How does Aetrix verify that STG3699QTR is sourced from the original manufacturer or authorized distributors?

All STG3699QTR 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 STG3699QTR meets industry standards.

7.What is the process for return or replacement of STG3699QTR?

All STG3699QTR units undergo pre-shipment inspection (PSI). If there is an issue with STG3699QTR, 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 STG3699QTR part is unused and in its original packaging.

Return procedure for STG3699QTR:

1.Submit a request within 90 days.

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

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