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STMicroelectronics STG3684QTR
- Part No.:
- STG3684QTR
- Manufacturer:
- STMicroelectronics
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
STG3684QTR.pdf
- Description:
- IC SWITCH SPDT X 2 500MOHM 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,229
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Product details
Overview
STG3684QTR from STMicroelectronics is a high-speed, low-voltage dual SPDT analog switch fabricated in silicon gate C2MOS technology. It operates from 1.65V to 4.3V single supply, delivers <0.5Ω max ON-resistance at VCC = 3.0V, features 0.3ns typical propagation delay, and includes Break-Before-Make timing for signal integrity in portable audio routing and USB 2.0 data path switching.
For engineers reviewing the STG3684QTR datasheet, STG3684QTR pinout, STG3684QTR application, or STG3684QTR equivalent, key selection criteria include guaranteed 1.8V-compatible control thresholds, ultra-low 0.2µA max ICC at 85°C, 7kV HBM ESD rating on analog channels, and QFN-16 package thermal performance for space-constrained battery-powered designs.
Technical Context
The STG3684QTR implements two independent SPDT analog switches with complementary control logic: each IN input enables S1 when high and S2 when low. Its C2MOS architecture ensures rail-to-rail analog signal handling (0V to VCC) and fast channel switching with 2–15ns Break-Before-Make delay across 1.65–4.3V operation.
It supports wide-bandwidth analog signals up to 50MHz (−3dB), achieves −64dB off-isolation and −54dB crosstalk at 100kHz, and maintains <0.07Ω RON flatness over 1.5V signal swing - enabling precision multiplexing in ADC front-ends and audio codec I/O switching without gain error or distortion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65V to 4.3V single supply - enables direct interface with 1.8V/2.5V/3.3V/3.6V logic and analog rails without level shifters. |
| tPD (Typ.) | 0.3ns at VCC = 3.0V - supports high-speed digital control of analog paths in USB 2.0 or DDR clock gating. |
| RON (Max) | 0.5Ω at VCC = 2.7–3.0V, TA = 25°C - minimizes insertion loss and voltage drop in precision sensor signal routing. |
| ICC (Max) | 0.2µA at TA = 85°C - extends battery life in always-on wearable sensor hubs and IoT endpoint nodes. |
| ESD Rating | HBM > 7kV on analog channels vs. GND - eliminates need for external TVS diodes in handheld device I/O protection. |
| Break-Before-Make | 2–15ns delay - prevents momentary short-circuit between source channels during switching in power domain isolation. |
| Bandwidth | 50MHz (−3dB) - preserves signal fidelity for composite video, audio line-level, and baseband RF applications. |
Pinout & Package
STG3684QTR is housed in a 3×3 mm QFN-16 package with exposed thermal pad (pin 6 = GND, pins 5/7/8/13/15/16 = NC). The package supports reflow soldering per JEDEC J-STD-020 and provides low thermal resistance for sustained analog switching in compact PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 9 (1IN, 2IN) | Digital control inputs | CMOS-compatible, 1.8V-tolerant inputs that enable complementary SPDT switching per channel. |
| 2, 10 (1S1, 2S1) | Analog source 1 terminals | Low-capacitance (37pF) inputs routed to D1/D2 when corresponding IN = high. |
| 4, 12 (1S2, 2S2) | Analog source 2 terminals | Complementary analog inputs connected to D1/D2 when corresponding IN = low. |
| 3, 11 (D1, D2) | Common analog outputs | Low-impedance, bidirectional ports supporting rail-to-rail analog signal flow (0V to VCC). |
| 6 | GND | Primary ground reference and thermal pad connection point for heat dissipation. |
| 14 | VCC | Single positive supply input; powers internal logic and analog switch core. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ON-resistance | 0.5Ω max at 3.0V - reduces signal attenuation and THD in audio and sensor signal chains. |
| Break-Before-Make timing | Guaranteed 2–15ns delay - prevents cross-conduction in power domain switching and mixed-signal routing. |
| 1.8V-compatible control | VIH = 0.65×VCC down to 1.65V - allows direct interfacing with 1.8V microcontrollers without level translation. |
| High ESD robustness | 7kV HBM on analog channels - simplifies system-level ESD design for consumer handhelds and medical wearables. |
| Low charge injection | 35pC max at VCC ≥ 3.0V - minimizes glitch-induced offset in precision ADC sample-and-hold circuits. |
Applications
| Portable Audio Codec Switching | USB 2.0 Data Path Multiplexing |
|---|---|
|
Use Scenario: Routing microphone and headset signals between baseband processor and audio codec in smartphones. IC Role / Device Role / Timing Role: Dual SPDT analog switch providing bidirectional, low-distortion signal path selection with Break-Before-Make timing. Use Value: 0.03% THD and 50MHz bandwidth preserve full audio fidelity; 0.5Ω RON avoids gain mismatch between stereo channels. |
Use Scenario: Selecting between host and peripheral USB 2.0 D+/D− lines in OTG-enabled tablets. IC Role / Device Role / Timing Role: High-speed analog multiplexer enabling dynamic USB role reversal without signal degradation. Use Value: 0.3ns tPD and −54dB crosstalk ensure compliance with USB 2.0 eye diagram requirements at 480Mbps. |
| Industrial Sensor Signal Conditioning | Battery-Powered Data Acquisition Front-End |
|
Use Scenario: Multiplexing multiple RTD or thermocouple inputs into a single precision ADC in field transmitters. IC Role / Device Role / Timing Role: Low-leakage (<100nA IOFF), low-RON analog switch minimizing measurement error and self-heating. Use Value: 0.07Ω RON flatness over 1.5V range ensures consistent gain across temperature spans; 7kV ESD protects against field wiring transients. |
Use Scenario: Enabling/disabling sensor channels in ultra-low-power environmental monitoring nodes. IC Role / Device Role / Timing Role: Power-gated analog switch controlled by MCU GPIO to minimize system standby current. Use Value: 0.2µA max ICC at 85°C extends multi-year battery life; QFN-16 footprint saves PCB area in coin-cell-powered designs. |
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 |
|---|---|---|---|
| TSM1014IDT | Higher RON (1.2Ω min at 3V), no Break-Before-Make guarantee, 5V-only supply | Limited to 5V systems; unsuitable for 1.8V control or battery-powered designs | Select only if legacy 5V infrastructure prohibits voltage scaling and RON tolerance >1Ω is acceptable. |
| MAX4684EUB+ | Lower bandwidth (33MHz), higher charge injection (60pC), same QFN-10 package | Acceptable for audio but marginal for USB 2.0 due to bandwidth and jitter sensitivity | Prefer for cost-sensitive audio-only applications where 50MHz bandwidth is not required. |
Compared with TSM1014IDT and MAX4684EUB+, STG3684QTR uniquely combines 1.65–4.3V operation, sub-0.5Ω RON, and guaranteed Break-Before-Make - making it the only option qualified for simultaneous low-voltage control, precision analog routing, and high-speed data path switching.
Availability
STG3684QTR is available at Aetrix Electronics and suitable for portable audio routing, USB 2.0 OTG switching, and industrial sensor multiplexing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for STG3684QTR 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, specializing in automotive, industrial, power, and analog/mixed-signal solutions with vertical manufacturing and broad IP portfolio.
The STG3684 belongs to ST's high-performance analog switch product line, engineered specifically for low-voltage, high-fidelity signal routing in portable and battery-operated equipment where power efficiency, signal integrity, and small footprint are critical.
FAQ
Is STG3684QTR pin-compatible with STG3684CTR?
No. STG3684QTR uses a 3×3 mm QFN-16 package with exposed thermal pad and specific pin mapping (e.g., GND on pin 6), while STG3684CTR is a SO-16 package with different mechanical layout and thermal characteristics. PCB redesign is required for substitution.
Does STG3684QTR support bidirectional analog signal flow?
Yes. All analog terminals (S1, S2, D) are fully bidirectional and support rail-to-rail signal voltages from 0V to VCC. The switch exhibits symmetrical RON and capacitance regardless of signal direction, verified per Table 6 and Figure 3 in the datasheet.
What is the maximum analog signal voltage swing supported?
The maximum analog signal voltage swing is 0V to VCC, with VCC rated from 1.65V to 4.3V. At VCC = 3.0V, signals from 0V to 3.0V are fully supported; exceeding VCC or going below GND risks latch-up or damage per Absolute Maximum Ratings (Table 4).
Can STG3684QTR be used in automotive applications?
STG3684QTR is specified for −55°C to +125°C operating temperature and meets JESD17 latch-up immunity (>300mA), but it is not AEC-Q100 qualified. It may be used in non-safety-critical automotive infotainment or body electronics only after full system-level qualification by the end customer.
STG3684QTR 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):
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
STG3684QTR FAQ
1.How can I place an order for STG3684QTR through Aetrix?
Please submit a Request for Quotation (RFQ) for STG3684QTR 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 STG3684QTR reliable?
The price and inventory of STG3684QTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STG3684QTR is usually 5 days.
3.What payment methods are accepted for STG3684QTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STG3684QTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STG3684QTR?
STG3684QTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STG3684QTR 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 STG3684QTR?
For technical support, including STG3684QTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STG3684QTR requirements.
6.How does Aetrix verify that STG3684QTR is sourced from the original manufacturer or authorized distributors?
All STG3684QTR 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 STG3684QTR meets industry standards.
7.What is the process for return or replacement of STG3684QTR?
All STG3684QTR units undergo pre-shipment inspection (PSI). If there is an issue with STG3684QTR, 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 STG3684QTR part is unused and in its original packaging.
Return procedure for STG3684QTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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