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STMicroelectronics STG6684QTR
- Part No.:
- STG6684QTR
- Manufacturer:
- STMicroelectronics
- Package:
- 10-UFQFN
- Datasheet:
-
STG6684QTR.pdf
- Description:
- IC SWITCH SPDT X 2 550MOHM 10QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,332
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Product details
Overview
STG6684QTR from STMicroelectronics is a high-isolation dual SPDT analog switch fabricated in C2MOS technology, functioning as a 2:1 multiplexer/demultiplexer with independent S/T/D channel routing per switch. It delivers -80 dB off-isolation at 1 MHz, 0.55 Ω Sn-channel on-resistance at 4.3 V, and operates from 1.65–4.3 V single supply - enabling low-voltage portable audio routing and sensor signal switching.
For engineers reviewing the STG6684QTR datasheet, STG6684QTR pinout, STG6684QTR application, or STG6684QTR equivalent, key selection criteria include ultra-low ICC (0.2 μA max at 85 °C), break-before-make timing (2–6 ns), channel-matched RON (±7 mΩ for Sn), and QFN10L package compatibility with space-constrained PCB layouts.
Technical Context
The STG6684 implements two independent CMOS SPDT switches, each controlled by a dedicated SELn input: low SELn connects Sn to Dn, high SELn connects Tn to Dn. Its C2MOS process enables rail-to-rail analog signal handling with 1.8 V–4.3 V logic-compatible control thresholds across the full 1.65–4.3 V supply range.
Each switch exhibits asymmetric ON-resistance profiles: Sn channels achieve 0.55 Ω (max) while Tn channels reach 1.30 Ω (max) at VCC = 4.3 V and TA = 25 °C, with flatness ≤0.20 Ω for Sn and ≤0.55 Ω for Tn - supporting precision signal path matching in differential or multi-source routing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Off-isolation (Tn) | -80 dB at 1 MHz: prevents crosstalk between disabled T1/T2 paths in multi-channel audio or sensor arrays |
| RON (Sn) | 0.55 Ω max at 4.3 V: minimizes insertion loss for low-amplitude analog signals like microphone inputs |
| RON (Tn) | 1.30 Ω max at 4.3 V: supports higher-drive paths such as DAC outputs or line drivers |
| Bandwidth (Sn) | 65 MHz (-3 dB): preserves signal integrity up to video baseband or fast ADC sampling rates |
| Quiescent current | 0.2 μA max at 85 °C: extends battery life in always-on wearable or IoT sensor nodes |
| Break-before-make delay | 2–6 ns: eliminates momentary short-circuits during channel switching in power-sensitive analog front-ends |
| ESD rating | 2000 V HBM: ensures robustness against handling discharge without external protection diodes |
Pinout & Package
STG6684QTR uses a 10-pin QFN10L package (1.8 × 1.4 mm, 0.4 mm pitch) with exposed thermal pad. Pin 1 is top-left corner (S1), pin 10 is bottom-right (D1); pin 3 is VCC, pin 8 is GND, and pins 4/9 are digital control inputs (SEL2/SEL1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 6 (S1, S2) | Source input (Sn channel) | Low-impedance analog input path activated when corresponding SELn = L; optimized for <0.55 Ω RON |
| 2, 7 (T1, T2) | Source input (Tn channel) | Alternate analog input path activated when corresponding SELn = H; RON ≤1.30 Ω supports higher-current loads |
| 3 (VCC) | Positive supply | Single 1.65–4.3 V rail powers both analog and digital sections; tolerant of 4.3 V logic inputs |
| 4, 9 (SEL2, SEL1) | Digital control input | 1.8 V–4.3 V compatible; drives internal CMOS gates with <1 μA leakage at full temperature range |
| 5, 10 (D2, D1) | Common output (switch node) | Shared analog output port per switch; supports bidirectional signal flow with <40 pF COFF when OFF |
| 8 (GND) | Ground reference | Return path for analog signals and supply current; requires low-inductance connection to minimize noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-high off-isolation | -80 dB at 1 MHz isolates unused signal paths in multi-sensor data acquisition systems |
| Asymmetric RON optimization | Sn (0.55 Ω) and Tn (1.30 Ω) channels enable load-matched routing: low-RON for sensitive inputs, higher-RON for robust outputs |
| Break-before-make timing | 2–6 ns guarantees no overlap between Sn and Tn conduction, preventing short-through in powered analog multiplexing |
| Low charge injection | 43–51 pC minimizes voltage glitches on high-impedance nodes like ADC sample capacitors or op-amp inputs |
| Wide supply compatibility | 1.65–4.3 V operation allows direct interfacing with 1.8 V, 2.5 V, 3.3 V, and 4.2 V battery rails without level shifters |
Applications
| Portable Audio Signal Routing | Multi-Sensor Data Acquisition |
|---|---|
|
Use Scenario: Switching between stereo microphone inputs and line-out paths in Bluetooth earbuds or voice assistants. IC Role / Device Role / Timing Role: Dual SPDT analog switch managing bidirectional audio paths with sub-100 ns switching and <0.55 Ω RON. Use Value: Preserves SNR >95 dB by limiting crosstalk to -90 dB (S1–S2) and maintaining flat frequency response up to 65 MHz. |
Use Scenario: Multiplexing outputs from temperature, humidity, and accelerometer sensors into a shared ADC channel. IC Role / Device Role / Timing Role: Low-leakage (±0.1 μA) analog switch enabling accurate DC-coupled measurements without signal corruption. Use Value: Enables <0.01% THD and ±7 mΩ RON matching across Sn channels for consistent gain calibration across sensor channels. |
| Class-D Amplifier Output Protection | Wearable Biopotential Monitoring |
|
Use Scenario: Isolating Class-D amplifier outputs during startup/shutdown to prevent pop/click transients. IC Role / Device Role / Timing Role: High-isolation (-80 dB) SPDT switch placed between amplifier and speaker load. Use Value: Break-before-make timing (≤6 ns) eliminates shoot-through risk while off-isolation suppresses PWM carrier coupling. |
Use Scenario: Routing ECG/EEG electrode signals to instrumentation amplifiers while rejecting common-mode noise. IC Role / Device Role / Timing Role: Low-capacitance (COFF,Sn = 40 pF) analog switch minimizing loading on high-Z biopotential nodes. Use Value: Ultra-low ICC (0.2 μA) extends coin-cell battery life beyond 12 months in always-on biosensing patches. |
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 |
|---|---|---|---|
| TMUX6212RUMR | Higher RON (1.8 Ω typ), lower off-isolation (-65 dB at 1 MHz), 5-V only supply | Requires external level shifting for 1.8 V control; less suitable for battery-powered designs | Prefer when system uses 5 V rails and prioritizes latch-up immunity over isolation |
| ADG732BRUZ | 32-channel, not dual SPDT; 3.5 Ω RON, -68 dB off-isolation, SPI interface instead of parallel SEL | Designed for high-channel-count industrial I/O modules, not compact portable routing | Choose only if expanding to >4 channels and accepting higher RON and control overhead |
Compared with TMUX6212RUMR and ADG732BRUZ, STG6684QTR uniquely balances ultra-low power (0.2 μA), high isolation (-80 dB), and QFN10L footprint - making it optimal for space- and energy-constrained portable analog multiplexing where discrete channel control and rail-to-rail signal integrity are critical.
Availability
STG6684QTR is available at Aetrix Electronics and suitable for portable audio routing, multi-sensor data acquisition, and wearable biopotential monitoring requiring stable component supply amid long product lifecycles.
Supply support for STG6684QTR 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, specializing in power management, analog, MEMS, and microcontrollers for industrial, automotive, and consumer markets.
The STG6684 belongs to ST's high-performance analog switch portfolio, engineered specifically for low-voltage portable electronics demanding ultra-low power, high isolation, and minimal signal distortion in compact form factors.
FAQ
Is STG6684QTR still in active production?
No - STG6684QTR is marked as Obsolete Product(s) in the official ST datasheet (Rev 1, Jan 2008). Aetrix Electronics maintains legacy inventory with full traceability and provides last-time-buy support, including documentation and application guidance for ongoing designs.
Can STG6684QTR operate with 1.8 V logic control while powered from 3.3 V VCC?
Yes - the SELn inputs are 1.8 V compatible and 4.3 V tolerant across the full 1.65–4.3 V VCC range. At VCC = 3.3 V, VIH is guaranteed ≥1.4 V and VIL ≤0.3 V, ensuring reliable switching with standard 1.8 V GPIOs without level translation.
What is the maximum analog signal swing supported by STG6684QTR?
The device supports rail-to-rail analog signals from GND to VCC. With VCC = 4.3 V, the absolute maximum analog input is -0.5 V to +4.8 V (per Absolute Maximum Ratings Table 4), but recommended operating range is 0 to VCC for guaranteed RON and THD performance.
Does STG6684QTR require external bypass capacitors on VCC?
Yes - ST recommends a 100 nF ceramic capacitor placed as close as possible to the VCC (pin 3) and GND (pin 8) pads. This stabilizes the internal charge pump and reduces supply-induced crosstalk, especially critical for maintaining -80 dB off-isolation at high frequencies.
STG6684QTR 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):
- 550mOhm
- Channel-to-Channel Matching (ΔRon):
- 10mOhm
- Voltage - Supply, Single (V+):
- 1.65V ~ 4.3V
- Voltage - Supply, Dual (V±):
- -
- Switch Time (Ton, Toff) (Max):
- 55ns, 30ns
- -3db Bandwidth:
- 65MHz
- Charge Injection:
- 49pC
- Channel Capacitance (CS(off), CD(off)):
- 85pF
- Current - Leakage (IS(off)) (Max):
- 100nA
- Crosstalk:
- -85dB @ 1MHz
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-QFN (1.8x1.4)
STG6684QTR FAQ
1.How can I place an order for STG6684QTR through Aetrix?
Please submit a Request for Quotation (RFQ) for STG6684QTR 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 STG6684QTR reliable?
The price and inventory of STG6684QTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STG6684QTR is usually 5 days.
3.What payment methods are accepted for STG6684QTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STG6684QTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STG6684QTR?
STG6684QTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STG6684QTR 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 STG6684QTR?
For technical support, including STG6684QTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STG6684QTR requirements.
6.How does Aetrix verify that STG6684QTR is sourced from the original manufacturer or authorized distributors?
All STG6684QTR 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 STG6684QTR meets industry standards.
7.What is the process for return or replacement of STG6684QTR?
All STG6684QTR units undergo pre-shipment inspection (PSI). If there is an issue with STG6684QTR, 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 STG6684QTR part is unused and in its original packaging.
Return procedure for STG6684QTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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