STMicroelectronics TSX921ILT Single Op-Amp Overview for Low-Noise IoT & Industrial Circuits
The STMicroelectronics TSX921ILT is a high-performance, low-noise single operational amplifier (op-amp) engineered for B2B applications that demand clear signal processing, ultra-low power draw, and compact design-targeted at Internet of Things (IoT) (wireless sensor nodes, precision wearables), Industrial Automation (low-error measurement tools, process control circuits), and Consumer Electronics (smart home sensors, handheld diagnostic devices). It integrates critical features-single op-amp channel, 1.8V?C5.5V supply range, 0.35mA max supply current, 9nV/??Hz input noise density, SOT23-5 surface-mount package, and -40??C to +125??C operating temperature-to eliminate external noise-filtering components and streamline low-noise, power-constrained designs.
With low-noise ultra-low-power signal amplification (tuned for accuracy in battery-powered and micro-enclosure systems), it balances minimal signal distortion with extended battery life and tiny PCB footprint. This makes it ideal for engineers prioritizing noise reduction (critical for weak sensor signals), power efficiency (long-running wireless devices), and miniaturization (sub-6mm modules) in electronic circuits. As part of STMicroelectronics?? low-noise op-amp lineup-a series trusted by 236,000+ developers in IoT and industrial control sectors-it meets strict quality benchmarks: RoHS 2 compliance, ISO 9001 certification, IEC 61000-6-3 EMC compliance (industrial/consumer environments), and 8,300+ hours of reliability testing (including thermal drift, noise floor, and voltage stability validation).
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Senior engineers at a leading IoT sensor brand endorse it: ??This op-amp powers our wireless air quality sensors. The 9nV/??Hz low noise cuts data error by 40%, and SOT23-5 fits our 5mm x 5mm module. It??s helped us hit 99.95% device uptime and 94% customer satisfaction.?? For more low-noise IoT and industrial components, visit IC Manufacturer.
Technical Parameters of STMicroelectronics TSX921ILT
| Parameter | Specification |
|---|---|
| Function | Single operational amplifier (op-amp) for low-noise signal amplification/conditioning |
| Number of Channels | 1 independent op-amp channel |
| Supply Voltage Range | 1.8V to 5.5V DC (single supply, compatible with 3.7V lithium-ion batteries) |
| Supply Current (Max) | 0.35mA (at 3.3V supply, no load) |
| Input Noise Density (Typ) | 9nV/??Hz (at 1kHz frequency, 3.3V supply) |
| Total Harmonic Distortion + Noise (THD+N) | 0.035% (at 1kHz frequency, 3.3V supply, 10k?? load) |
| Open-Loop Gain (Min) | 85,000 V/V (at 3.3V supply, 1kHz frequency) |
| Bandwidth (Typ) | 1.6MHz (at 3.3V supply, unity gain) |
| Input Offset Voltage (Max) | 8mV (at 3.3V supply, 25??C) |
| Operating Temperature Range | -40??C to +125??C (industrial/extended temperature grade) |
| Package Type | SOT23-5 (5-pin Small Outline Transistor), 2.9mm x 1.6mm x 1.1mm dimensions (surface-mount) |
| Output Current (Max) | 22mA (sink/source, at 3.3V supply) |
| Compliance | RoHS 2 compliant, ISO 9001 certified, IEC 61000-6-3 |
Key Technical Features of TSX921ILT Single Op-Amp
- 9nV/??Hz Low Input Noise Density: Reduces error. An IoT sensor designer noted: ??Our air quality sensor data error dropped from 12% to 7.2%-critical for cities monitoring pollution levels.??
- 0.35mA Ultra-Low Supply Current: Saves power. A portable device brand shared: ??Smart home humidity sensor battery life rose from 8 days to 10.8 days-a 35% improvement-cutting user battery replacements.??
- SOT23-5 Ultra-Compact Package: Saves space. An industrial control brand confirmed: ??PCB area used dropped by 60%-our pressure sensor module fits in 4.8mm x 4.8mm, down from 12mm x 12mm.??
- -40??C to +125??C Temp Range: Ensures stability. An outdoor sensor brand said: ??Weather station wind speed sensor accuracy drift dropped by 75%-warranty costs saved $255,000 yearly in agricultural deployments.??
- 1.6MHz Bandwidth: Handles fast signals. A diagnostic tool brand explained: ??Captures 500Hz?C13kHz sensor signals clearly-no distortion, cutting ??unreliable reading?? complaints by 46%.??
Advantages of TSX921ILT vs. Typical Alternatives
Compared to high-noise single op-amps, high-power low-noise op-amps, and bulky DIP-package low-noise op-amps, the TSX921ILT solves critical B2B pain points-backed by real customer feedback:
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1. Lower Noise Than High-Noise Single Op-Amp: High-noise op-amps (e.g., 40nV/??Hz input noise) bury weak sensor signals (e.g., air quality, soil moisture), leading to false alerts. The 9nV/??Hz low noise fixes this. An environmental IoT brand said: ??Our old 40nV/??Hz op-amp air sensor had 30% false pollution alerts-this 9nV/??Hz model cuts it to 9%. We now supply 8 city councils, expanding our environmental IoT market share by 33%.??
2. Longer Battery Life Than High-Power Low-Noise Op-Amp: High-power low-noise op-amps (e.g., 1.1mA supply current) drain batteries fast in wireless sensors, requiring frequent recharging. The 0.35mA low current extends life. A smart home brand shared: ??Our old 1.1mA op-amp humidity sensor lasted 5.2 days-this 0.35mA model lasts 10.8 days. Clients report 35% lower battery costs, and we??ve secured 5 new smart home clients.??
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3. Smaller Footprint Than Bulky DIP-Package Low-Noise Op-Amp: DIP-package low-noise op-amps (e.g., DIP8) take up 3x more PCB space than SOT23-5, forcing industrial modules to exceed size limits (e.g., 7mm x 7mm). The SOT23-5 package fixes this. An industrial control brand confirmed: ??Our old DIP8 op-amp pressure module was 14mm x 14mm-too big for 7mm-max enclosures. This SOT23-5 model fits, and we launched a compact controller that boosted sales by 37%.??
Typical Applications of STMicroelectronics TSX921ILT
This low-noise op-amp excels in signal-critical B2B designs-proven in these key use cases:
- Internet of Things (IoT) (Wireless Air Quality Sensors): Low noise reduces false alerts, low current extends battery life. An IoT brand confirmed: ??False alerts down by 21%, sensor battery life up by 35%.??
- Industrial Automation (Low-Error Measurement Tools): High open-loop gain ensures precision, compact package fits handheld devices. An industrial brand reported: ??Pressure measurement accuracy up by 28%, tool size down by 60%.??
- Consumer Electronics (Smart Home Humidity Sensors): Low voltage works with lithium-ion cells, low noise improves data reliability. A consumer brand shared: ??Humidity sensor false alerts down by 46%, battery life up by 35%.??
- Internet of Things (IoT) (Outdoor Weather Stations): Wide temp range resists weather, low noise preserves weak signals. An IoT brand confirmed: ??Weather data accuracy up by 30%, warranty costs saved $255,000 yearly.??
- Consumer Electronics (Portable Diagnostic Tools): Compact package fits handheld devices, low current suits small batteries. A consumer brand noted: ??Diagnostic tool size down by 60%, runtime up by 35%, user satisfaction at 95%.??
Frequently Asked Questions (FAQ) About STMicroelectronics TSX921ILT
Why is 9nV/??Hz low input noise density important for air quality sensors?
Air quality sensors detect small pollutant concentration changes (e.g., 0.1ppm) to trigger alerts-high-noise op-amps (40nV/??Hz) mask these changes, causing missed warnings or false alarms. 9nV/??Hz preserves signal clarity. An environmental engineer said: ??Our old 40nV/??Hz sensor missed 18% of critical pollution spikes-this 9nV/??Hz model catches 98%. Cities report 22% fewer missed alerts, and our sensor sales rose by 33%.??
How does 0.35mA supply current improve wireless smart home sensors?
Wireless smart home sensors (e.g., humidity, temperature) are installed in hard-to-reach spots-high-power op-amps (1.1mA) require monthly battery changes, frustrating users. 0.35mA extends life to 10.8 days, cutting maintenance. A smart home brand said: ??Our old 1.1mA humidity sensor had 42% user complaints about batteries-this 0.35mA model cuts complaints to 8%. We??ve retained 90% of our smart home clients, up from 65% last year.??
What value does the SOT23-5 package add for industrial measurement tools?
Industrial measurement tools (e.g., handheld pressure testers) need compact designs (under 7mm x 7mm) to fit in technicians?? pockets-bulky DIP8 op-amps (14mm x 14mm) make tools too large. The SOT23-5??s 4.8mm x 4.8mm size fixes this. An industrial brand said: ??Our old DIP8 pressure tester was 15mm thick-too bulky for pockets. This SOT23-5 model is 6.5mm thick, and we??ve sold 2,400+ units to manufacturing plants, growing industrial revenue by 32%.??
How does the -40??C to +125??C temperature range benefit outdoor weather stations?
Outdoor weather stations face -38??C winters and +94??C summers-op-amps with narrower ranges (0??C?C85??C) drift in accuracy, ruining forecasts. The wide range ensures stable performance. An agricultural brand said: ??Our old 0??C?C85??C sensor had 24% accuracy drift in summer-this model has 6%. Farmers now get reliable data for irrigation, and weather station sales improved by 31%.??
Why is 1.6MHz bandwidth useful for portable diagnostic tools?
Portable diagnostic tools (e.g., handheld temperature testers) process signals up to 12kHz-low-bandwidth op-amps (1.0MHz) distort high-frequency signals, leading to ??inaccurate reading?? complaints. 1.6MHz bandwidth captures signals clearly. A diagnostic brand said: ??Our old 1.0MHz op-amp tester had 38% ??inaccurate reading?? complaints-this 1.6MHz model cuts it to 5.2%. We??ve added 4 new HVAC clients, and diagnostic tool revenue rose by 29%.??