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STMicroelectronics STG3856QTR
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- Part No.:
- STG3856QTR
- Manufacturer:
- STMicroelectronics
- Package:
- 12-UFQFN
- Datasheet:
-
STG3856QTR.pdf
- Description:
- IC SWITCH SP3T X 2 1OHM 12QFN
- Quantity:
- Payment:
- Shipping:
Inventory:21,839
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Product details
Overview
STG3856QTR from STMicroelectronics is a high-speed CMOS dual SP3T analog switch with break-before-make operation, designed for low-voltage portable systems. It operates from 1.65 V to 4.3 V, delivers ≤1.0 Ω ON resistance at 4.3 V, achieves 0.3 ns typical propagation delay, and supports 100 MHz –3 dB bandwidth - enabling precision signal routing in USB 2.0, audio multiplexing, and sensor interface applications.
For engineers reviewing the STG3856QTR datasheet, STG3856QTR pinout, STG3856QTR application, or STG3856QTR equivalent, key selection criteria include guaranteed break-before-make timing (≥7 ns min), ultra-low ICC (≤0.2 µA max at 85°C), 4.3 V-tolerant control inputs, and QFN12L (2.2 × 1.4 mm) package compatibility with space-constrained PCB layouts.
Technical Context
The STG3856 implements two independent single-pole triple-throw analog switches using silicon gate C2MOS technology, each controlled by dedicated IN pins (1IN/2IN) with L/H logic states defining connection paths between common D1/D2 and three selectable Sx ports. Its internal architecture enforces strict break-before-make timing (≥7 ns) to prevent signal shorting during state transitions.
All analog channels feature matched ON resistance (ΔRON ≤ 0.01 Ω), flat RON over full signal swing (RFLAT ≤ 0.35 Ω at 2.7 V), and high off-isolation (–82 dB at 100 kHz), ensuring minimal crosstalk and THD < 0.03% across 20 Hz–20 kHz audio band with 600 Ω load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 4.3 V single supply - enables direct integration with Li-ion battery, 1.8 V/3.3 V I/O, and mixed-voltage SoC interfaces |
| RON (max) | 1.0 Ω at VCC = 4.3 V - preserves signal integrity in low-impedance audio and data lines |
| tPD (typ) | 0.3 ns at VCC = 3.0 V - supports high-speed switching in USB 2.0 and DDR clock routing |
| OIRR | –82 dB at 100 kHz - prevents coupling between inactive channels in multi-sensor systems |
| ICC (max) | 0.2 µA at TA = 85°C - extends battery life in always-on wearable and IoT endpoints |
| Break-Before-Make Delay | 7 ns min at VCC = 3.6–4.3 V - eliminates transient shorts during channel reconfiguration |
| ESD Rating | HBM > 2 kV on analog channels - withstands handling and board-level ESD events without protection diodes |
Pinout & Package
STG3856QTR uses a 12-pin QFN package (2.2 mm × 1.4 mm, 0.4 mm pitch) with exposed thermal pad (EP) for enhanced power dissipation in compact layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1IN, 2IN | Digital control inputs | CMOS-compatible logic pins selecting switch state (L/L = Hi-Z; H/L = D1–1S2/D2–2S2) |
| D1, D2 | Common analog inputs/outputs | Low-capacitance bidirectional ports connecting to SoC or codec I/O |
| 1S1–1S3, 2S1–2S3 | Analog switch outputs | Three independent destination paths per switch; RON match ≤ 0.01 Ω ensures balanced signal routing |
| VCC | Positive supply | Single rail powering both logic and analog sections; tolerant to 5.5 V absolute max |
| GND | Ground reference | Common return for analog signals and digital control; decoupling required near pin 5 |
Key Features
| Feature | Design Value |
|---|---|
| Break-before-make timing | Guaranteed ≥7 ns minimum delay prevents momentary short-circuit between source paths during switching |
| Ultra-low quiescent current | 0.2 µA max at 85°C enables use in battery-backed always-on sensor hubs without runtime penalty |
| 4.3 V-tolerant control inputs | Accepts 1.8 V logic while powered from 2.3–4.3 V rails - simplifies level-shifting in mixed-voltage designs |
| High off-isolation | –82 dB at 100 kHz ensures minimal leakage from active to inactive channels in multi-source systems |
| Low charge injection | 55 pC max at 4.3 V minimizes voltage glitch on sensitive nodes like ADC references or op-amp inputs |
Applications
| USB 2.0 Data Switching | Portable Audio Multiplexing |
|---|---|
Use Scenario: Routing USB D+/D– lines between host controller and multiple peripheral ports in docking stations or OTG adapters. IC Role / Device Role / Timing Role: Dual SP3T analog switch providing bidirectional 480 Mbps signal path selection with break-before-make enforcement. Use Value: Maintains signal integrity (100 MHz BW, <0.03% THD) and avoids bus contention via guaranteed 7 ns minimum break time. | Use Scenario: Selecting between microphone, headset, and line-in sources in smartphones or wireless earbuds. IC Role / Device Role / Timing Role: Low-RON analog multiplexer routing AC-coupled audio signals with minimal distortion and crosstalk. Use Value: Delivers –84 dB crosstalk and –82 dB off-isolation to preserve SNR across concurrent audio paths. |
| Sensor Signal Conditioning | Industrial Data Acquisition |
Use Scenario: Multiplexing outputs from temperature, humidity, and pressure sensors into a shared ADC input in environmental monitors. IC Role / Device Role / Timing Role: Precision analog switch enabling sequential sampling with matched channel resistance (ΔRON ≤ 0.01 Ω). Use Value: Ensures measurement accuracy by minimizing gain error variation (<0.35 Ω RFLAT) across full 0–VCC signal range. | Use Scenario: Isolating test equipment inputs from multiple DUTs in automated production testers or bench multimeters. IC Role / Device Role / Timing Role: High-isolation SP3T switch protecting sensitive front-end circuitry from back-drive or fault conditions. Use Value: Provides >2 kV HBM ESD robustness and 300 mA latch-up immunity for reliable operation in uncontrolled lab environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual SP3T analog switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TMUX136IRUKR | Higher RON (1.8 Ω typ at 3.3 V), no break-before-make guarantee, 1.2 V min VCC | Lacks BMB timing control - unsuitable where channel shorting must be avoided | Select only if lowest VCC operation (1.2 V) is critical and BMB is not required |
| ADG732BRUZ | 32-channel single-pole, higher ICC (1 µA max), no QFN12L package, 5 V max VCC | Designed for high-channel-count industrial muxing, not portable low-power use | Choose when scaling beyond dual SP3T or requiring SPI control instead of parallel logic |
Compared with TMUX136IRUKR and ADG732BRUZ, STG3856QTR uniquely combines guaranteed break-before-make timing, sub-1 Ω RON at 4.3 V, and 0.2 µA max ICC - making it optimal for battery-powered USB/audio systems where signal integrity and power efficiency are jointly constrained.
Availability
STG3856QTR is available at Aetrix Electronics and suitable for USB 2.0 switching, portable audio multiplexing, and sensor signal conditioning requiring stable component supply across automotive infotainment, medical wearables, and industrial handheld instruments.
Supply support for STG3856QTR 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, sensing, and connectivity solutions for automotive, industrial, and consumer markets.
The STG3856 belongs to ST's high-speed analog switch product line, engineered specifically for low-voltage portable electronics demanding ultra-low power, high bandwidth, and robust ESD performance in miniaturized QFN packages.
FAQ
What is the maximum allowable analog signal swing for STG3856QTR?
The STG3856QTR supports analog signals from GND to VCC. With VCC rated up to 4.3 V, the full signal range is 0 V to 4.3 V. Absolute maximum ratings allow –0.5 V to VCC + 0.5 V transient excursions, but sustained operation outside 0–VCC may degrade RON flatness or increase leakage.
Does STG3856QTR require external pull-up or pull-down resistors on 1IN/2IN?
No. The 1IN and 2IN pins have CMOS-compatible input thresholds (VIH ≥ 0.65×VCC, VIL ≤ 0.4×VCC) and negligible input leakage (±0.1 µA). Direct connection to FPGA or MCU GPIOs is sufficient; external biasing adds unnecessary node capacitance and degrades tPLH/tPHL.
Can STG3856QTR be used in bidirectional signal paths?
Yes. All analog terminals (D1, D2, 1S1–1S3, 2S1–2S3) are fully bidirectional with symmetrical RON and capacitance. The device passes signals equally well from D→S or S→D, supporting applications like USB 2.0 differential pair routing and audio loopback paths.
Is the exposed thermal pad (EP) on QFN12L electrically connected?
No. The exposed pad is internally unconnected and intended solely for mechanical anchoring and thermal conduction to the PCB. It must be soldered to a solid copper pour tied to GND for optimal thermal performance, but no electrical connection to any internal node is made.
STG3856QTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Switch Circuit:
- SP3T
- Multiplexer/Demultiplexer Circuit:
- 3:1
- Number of Circuits:
- 2
- On-State Resistance (Max):
- 1Ohm
- Channel-to-Channel Matching (ΔRon):
- 10mOhm
- Voltage - Supply, Single (V+):
- 1.65V ~ 4.3V
- Voltage - Supply, Dual (V±):
- -
- Switch Time (Ton, Toff) (Max):
- 40ns, 20ns
- -3db Bandwidth:
- 100MHz
- Charge Injection:
- 55pC
- Channel Capacitance (CS(off), CD(off)):
- 5pF
- Current - Leakage (IS(off)) (Max):
- 20nA
- Crosstalk:
- -84dB @ 100kHz
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-QFN (2.2x1.4)
STG3856QTR FAQ
1.How can I place an order for STG3856QTR through Aetrix?
Please submit a Request for Quotation (RFQ) for STG3856QTR 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 STG3856QTR reliable?
The price and inventory of STG3856QTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STG3856QTR is usually 5 days.
3.What payment methods are accepted for STG3856QTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STG3856QTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STG3856QTR?
STG3856QTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STG3856QTR 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 STG3856QTR?
For technical support, including STG3856QTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STG3856QTR requirements.
6.How does Aetrix verify that STG3856QTR is sourced from the original manufacturer or authorized distributors?
All STG3856QTR 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 STG3856QTR meets industry standards.
7.What is the process for return or replacement of STG3856QTR?
All STG3856QTR units undergo pre-shipment inspection (PSI). If there is an issue with STG3856QTR, 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 STG3856QTR part is unused and in its original packaging.
Return procedure for STG3856QTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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