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STMicroelectronics TS941IDT
- Part No.:
- TS941IDT
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TS941IDT.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,109
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Product details
Overview
TS941IDT from STMicroelectronics is a single-channel rail-to-rail output micropower operational amplifier designed for ultra-low-power signal conditioning in battery-constrained systems. It delivers 1.2 µA supply current, 10 kHz gain bandwidth, 1 pA input bias current, and rail-to-rail output swing (e.g., 2.85 V at 3 V supply with 10 kΩ load), enabling precision sensing in smoke detectors and portable pH meters.
For engineers reviewing the TS941IDT datasheet, TS941IDT pinout, TS941IDT application, or TS941IDT equivalent, this device is selected for micropower analog front-ends requiring stable operation from 2.5 V to 10 V, sub-µA quiescent current, and CMOS-input compatibility with high-impedance sensors.
Technical Context
The TS941IDT employs a CMOS input stage delivering 1 pA typical input bias current and operates across a 2.5 V–10 V single supply, maintaining constant 1.2 µA ICC over voltage range - critical for end-of-battery-life performance. Its rail-to-rail output stage achieves 2.85 V high-level and 100 mV low-level output at 3 V/10 kΩ, supporting full dynamic range in low-voltage systems.
It features 85 dB common-mode rejection and 85 dB supply voltage rejection at 5 V, with 10 kHz unity-gain bandwidth and 3 V/ms slew rate - optimized for DC-coupled sensor amplification and slow-varying industrial signals rather than high-speed AC applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 1.2 µA typical - enables >10-year battery life in coin-cell-powered smoke detectors |
| Input Bias Current | 1 pA typical - preserves signal integrity when interfacing with high-impedance pH electrodes or piezoresistive sensors |
| Gain Bandwidth Product | 10 kHz - sufficient for DC to low-frequency (<1 kHz) sensor signal amplification without instability |
| Rail-to-Rail Output | 2.85 V VOH / 100 mV VOL at 3 V/10 kΩ - maximizes usable ADC input range in 3 V microcontroller systems |
| Input Offset Voltage | 10 mV max (TS941) - sets baseline accuracy for uncalibrated low-cost instrumentation |
| CMRR / PSRR | 85 dB each at 5 V - rejects power supply noise and common-mode interference in noisy industrial environments |
| Operating Temperature | -40°C to +85°C - qualified for use in outdoor fire alarm enclosures and portable medical devices |
Pinout & Package
SOT23-5 package: compact 2.9 mm × 2.8 mm surface-mount outline with exposed pad not present; RoHS-compliant ECOPACK® grade; thermal resistance RthJA = 250°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Output | Amplified rail-to-rail voltage signal; drives 10 kΩ loads to within 100 mV of rails |
| 2 (IN–) | Inverting Input | Differential node for feedback configuration; 1 pA bias current minimizes error in high-Z networks |
| 3 (IN+) | Non-inverting Input | High-impedance CMOS input; accepts sensor signals up to VCC – 1.3 V common-mode range |
| 4 (V–) | Negative Supply / Ground | Reference for single-supply operation; tied to system ground in 2.5–10 V configurations |
| 5 (V+) | Positive Supply | Accepts 2.5 V–10 V; supply current remains stable across this range for predictable battery discharge |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Delivers full-scale output down to 100 mV above ground and up to 100 mV below V+, maximizing dynamic range in low-voltage MCUs |
| Micropower operation | 1.2 µA supply current enables multi-year operation on CR2032 cells in wireless sensor nodes |
| Ultra-low input bias current | 1 pA allows direct connection to glass pH electrodes and photodiode transimpedance stages without guard traces |
| Single-supply capability | Operates from 2.5 V to 10 V - compatible with Li-ion, alkaline, and regulated 3.3 V/5 V rails without dual supplies |
| Latch-up immunity (Class A) | Withstands 200 mA transient overcurrent without destructive latch-up - improves field reliability in ESD-prone environments |
Applications
| Smoke/Gas Detectors | pH Meter Front-End |
|---|---|
Use Scenario: Battery-powered optical smoke sensor with analog output feeding MCU ADC. IC Role / Device Role / Timing Role: Signal amplifier conditioning weak photocurrent from sensing chamber. Use Value: 1.2 µA quiescent current extends 9V battery life beyond 5 years; rail-to-rail output ensures full 0–3 V ADC utilization. |
Use Scenario: Portable handheld pH meter using glass electrode and temperature compensation. IC Role / Device Role / Timing Role: High-impedance buffer and gain stage for mV-level electrode potential. Use Value: 1 pA input bias prevents electrode polarization drift; CMOS inputs eliminate need for active guarding. |
| Battery-Powered Alarms | Portable Communication Pagers |
Use Scenario: Low-cost CO alarm with electrochemical sensor and audible alert circuit. IC Role / Device Role / Timing Role: Sensor signal conditioner and comparator reference buffer. Use Value: Stable 1.2 µA ICC over 2.5–10 V supply ensures consistent threshold detection as battery discharges from 9 V to 4.5 V. |
Use Scenario: Legacy pager receiving analog audio tone bursts decoded by microcontroller. IC Role / Device Role / Timing Role: Audio preamplifier stage before envelope detection. Use Value: 10 kHz GBW supports tone decoding up to 1 kHz; rail-to-rail output avoids clipping on 3 V logic rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar micropower rail-to-rail op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMV321IDBVR | Higher 65 µA ICC; 1 MHz GBW; 7 V max supply | Not suitable for >5-year battery life; better for higher-speed sensor interfaces | Select when bandwidth >100 kHz required and supply current <10 µA is not mandatory |
| TLV2461CDBVR | 45 µA ICC; 6.4 V max supply; 2.5 V min supply; 6.4 MHz GBW | Unsuitable for 9 V battery systems; superior AC performance but 37× higher quiescent current | Choose only if >100 kHz closed-loop bandwidth is needed and battery life is secondary |
Compared with LMV321IDBVR and TLV2461CDBVR, TS941IDT uniquely balances sub-µA supply current, rail-to-rail output, and 2.5–10 V operation - making it irreplaceable in long-life, wide-supply, low-bandwidth sensor front-ends where power budget is constrained to nanoamps per hour.
Availability
TS941IDT is available at Aetrix Electronics and suitable for smoke/gas detectors, portable pH meters, and battery-powered alarms requiring stable component supply across extended production lifecycles.
Supply support for TS941IDT 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, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
The TS94x series belongs to ST's precision micropower op-amp product line, engineered specifically for ultra-low-power sensor signal conditioning in battery-operated safety and measurement equipment.
FAQ
What is the maximum supply voltage for TS941IDT?
The absolute maximum supply voltage is 12 V, but the recommended operating range is 2.5 V to 10 V per the datasheet. Operation above 10 V risks exceeding safe junction temperature under load and voids parametric guarantees - especially critical in SOT23-5 due to its 250°C/W thermal resistance.
Does TS941IDT support true rail-to-rail input?
No - TS941IDT has rail-to-rail *output* only. Its common-mode input voltage range is specified as VDD − 0.2 V to VCC − 1.3 V, meaning the inputs cannot accept signals within 1.3 V of the positive rail. This limits direct sensing of VCC-referenced signals without level-shifting.
Can TS941IDT drive capacitive loads?
It is stable with ≤50 pF capacitive load per Figure 12 (phase margin ≥65°). Driving larger capacitive loads (e.g., long PCB traces or ADC input caps) requires isolation via a series resistor or external compensation - otherwise, overshoot and ringing occur in step response per Figure 13.
Is TS941IDT qualified for automotive applications?
No - TS941IDT is rated for −40°C to +85°C industrial temperature range and is not AEC-Q100 qualified. ST does not specify automotive-grade screening, humidity testing, or failure-in-time (FIT) data for this part; use TSZ121 or similar automotive-qualified op-amps for vehicle systems.
TS941IDT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.0045V/µs
- Gain Bandwidth Product:
- 10 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 10 mV
- Current - Supply:
- 1.2µA
- Current - Output / Channel:
- 5 mA
- Voltage - Supply Span (Min):
- 2.5 V
- Voltage - Supply Span (Max):
- 10 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TS941IDT FAQ
1.How can I place an order for TS941IDT through Aetrix?
Please submit a Request for Quotation (RFQ) for TS941IDT 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 TS941IDT reliable?
The price and inventory of TS941IDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS941IDT is usually 5 days.
3.What payment methods are accepted for TS941IDT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS941IDT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TS941IDT?
TS941IDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TS941IDT 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 TS941IDT?
For technical support, including TS941IDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS941IDT requirements.
6.How does Aetrix verify that TS941IDT is sourced from the original manufacturer or authorized distributors?
All TS941IDT 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 TS941IDT meets industry standards.
7.What is the process for return or replacement of TS941IDT?
All TS941IDT units undergo pre-shipment inspection (PSI). If there is an issue with TS941IDT, 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 TS941IDT part is unused and in its original packaging.
Return procedure for TS941IDT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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