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STMicroelectronics TS941AIDT
- Part No.:
- TS941AIDT
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TS941AIDT.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,789
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Product details
Overview
TS941AIDT from STMicroelectronics is a single-channel rail-to-rail output micropower operational amplifier optimized for ultra-low-power, single-supply operation (2.5 V to 10 V), featuring 1.2 µA typical supply current, 1 pA typical input bias current, and 10 kHz gain bandwidth product. It delivers rail-to-rail output swing (e.g., 2.85 V at 3 V with 10 kΩ load) and operates across –40°C to +85°C - ideal for battery-powered smoke detectors and portable pH meters.
For engineers reviewing the TS941AIDT datasheet, TS941AIDT pinout, TS941AIDT application, or TS941AIDT equivalent, this device is selected where micropower consumption, CMOS-input precision, and stable rail-to-rail output performance under low-voltage battery decay are critical - especially in sensor front-ends and alarm systems requiring long-term autonomy.
Technical Context
The TS941AIDT employs a CMOS input stage enabling ultra-low 1 pA input bias current and rail-to-rail output swing via complementary push-pull output transistors. Its 10 kHz gain-bandwidth product and 65° phase margin ensure stable unity-gain operation with capacitive loads up to 50 pF.
It achieves micropower operation through optimized biasing that maintains constant 1.2 µA supply current across 2.5–10 V supply range and over temperature (–40°C to +85°C), supporting reliable performance as battery voltage declines in end-of-life conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 1.2 µA typical - enables >10-year battery life in 10 µA-systems powered by CR2032 cells. |
| Input Bias Current | 1 pA typical - minimizes voltage error in high-impedance pH electrode and gas sensor interfaces. |
| Gain Bandwidth Product | 10 kHz - supports DC-coupled signal conditioning of slow-varying sensor outputs (e.g., thermistors, electrochemical cells). |
| Output Swing | Rail-to-rail - delivers full dynamic range at 3 V supply (2.85 V high / 0.1 V low into 10 kΩ), maximizing ADC utilization. |
| Input Offset Voltage | 5 mV max (A-grade) - ensures ≤0.5% error in 1 V full-scale sensor amplification without trimming. |
| Common-Mode Rejection | 85 dB - rejects noise from shared ground paths in compact battery-powered PCB layouts. |
| ESD Protection | 2 kV HBM - withstands handling and assembly without external protection diodes. |
Pinout & Package
SOT23-5 micropackage (ECOPACK® compliant), 1.45 mm × 2.90 mm × 1.30 mm body, surface-mount, lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN+) | Non-inverting input | CMOS input node; 1 pA bias current enables direct connection to high-Z sensors (e.g., glass pH electrodes). |
| 2 (IN−) | Inverting input | Differential input node; matched to IN+ for <5 mV offset in A-grade devices. |
| 3 (V−) | Negative supply / ground | Reference for single-supply operation; tied to system GND in 2.5–10 V configurations. |
| 4 (OUT) | Amplifier output | Rail-to-rail capable; drives 10 kΩ load to within 150 mV of rails at 3 V - suitable for driving SAR ADC reference buffers. |
| 5 (V+) | Positive supply | Accepts 2.5–10 V; supply current remains stable across this range - critical for declining battery voltage tracking. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output | Delivers full 0–VCC swing into 10 kΩ, preserving signal fidelity in low-voltage 3 V microcontroller systems. |
| Micropower operation | 1.2 µA supply current enables multi-year operation on coin-cell batteries in intermittent-sensing applications. |
| Ultra-low input bias current | 1 pA prevents loading of high-impedance sources (e.g., >100 MΩ pH probes), eliminating drift and offset errors. |
| Single-supply compatibility | Operates from 2.5 V - supports direct integration with Li-ion, alkaline, or NiMH battery stacks without LDO overhead. |
| Latch-up immunity | Class A rating ensures robustness against transient overvoltage events in unregulated battery environments. |
Applications
| Smoke Detector Front-End | pH Meter Signal Conditioning |
|---|---|
|
Use Scenario: Amplifying weak ion-current signals from optical smoke chamber photodiodes in battery-powered residential alarms. IC Role / Device Role / Timing Role: Transimpedance amplifier with rail-to-rail output driving low-power comparator threshold detection. Use Value: 1.2 µA quiescent current extends 9 V battery life beyond 5 years; rail-to-rail swing maximizes comparator hysteresis window. |
Use Scenario: Buffering high-impedance mV-level output of glass pH electrodes in handheld field meters. IC Role / Device Role / Timing Role: Unity-gain buffer isolating electrode from ADC input, rejecting common-mode noise in wet-environment PCBs. Use Value: 1 pA input bias current prevents electrode polarization drift; 85 dB CMRR suppresses 50/60 Hz mains interference. |
| Portable Gas Sensor Interface | Battery-Powered Alarm System |
|
Use Scenario: Amplifying nanoamp-level current from electrochemical CO or NO₂ sensors in wearable air quality monitors. IC Role / Device Role / Timing Role: Low-noise transimpedance stage with stable 10 kHz bandwidth for analog peak-detection filtering. Use Value: Constant 1.2 µA supply current across 2.5–3.6 V battery discharge ensures consistent sensor response time and calibration stability. |
Use Scenario: Driving piezoelectric buzzer or LED indicator in low-cost home security perimeter sensors. IC Role / Device Role / Timing Role: Voltage follower providing buffered supply-rail referenced logic-level enable signal. Use Value: Rail-to-rail output guarantees clean 0–3 V switching even at 2.7 V battery voltage - preventing false-trigger lockup. |
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 supply current; 7 V max supply; no 1 pA bias spec - uses bipolar input. | Not suitable for >10 MΩ sensor nodes; requires higher battery capacity. | Select only if GBW >1 MHz needed and power budget allows 50× higher ICC. |
| OPA348AIDBVR | 1 µA supply current; 100 kHz GBW; 0.5 pA bias - but 5.5 V max supply limits 9 V battery use. | Cannot operate directly from 9 V alkaline without regulator; better for 3.3 V systems. | Prefer when higher speed required and supply is regulated 3.3 V; avoid in unregulated multi-cell battery designs. |
Compared with LMV321IDBVR and OPA348AIDBVR, the TS941AIDT uniquely balances sub-µA power, true 10 V operation, and femtoamp-level input bias - making it irreplaceable in long-life, high-impedance, wide-supply-range sensor nodes where all three parameters are simultaneously constrained.
Availability
TS941AIDT is available at Aetrix Electronics and suitable for battery-powered smoke detectors, portable pH meters, gas sensor interfaces, and low-power alarm systems requiring stable component supply across extended production lifecycles.
Supply support for TS941AIDT 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, designing and manufacturing analog, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.
The TS94x series belongs to ST's precision analog portfolio, engineered specifically for ultra-low-power sensor signal conditioning in battery-constrained applications - emphasizing rail-to-rail output, femtoamp inputs, and supply voltage resilience.
FAQ
What is the maximum supply voltage for TS941AIDT?
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 thermal limits in the SOT23-5 package due to its 250 °C/W junction-to-ambient thermal resistance - sustained 12 V operation may cause junction temperatures to exceed 150 °C at ambient >50 °C.
Does TS941AIDT support true rail-to-rail input?
No - TS941AIDT features rail-to-rail *output* only. Its common-mode input voltage range is specified as VDD − 0.2 V to VCC − 1.3 V (e.g., 0.2 V to 1.7 V at 3 V supply), meaning the inputs cannot accept signals within 1.3 V of VCC. This is intentional for CMOS input stage optimization and does not affect typical sensor-buffering use cases where input stays near mid-supply.
Can TS941AIDT drive capacitive loads?
Yes - it is stable with up to 50 pF capacitive load, as verified by 65° phase margin in Figure 12. Driving >50 pF (e.g., long PCB traces or ADC input caps) requires isolation via a series resistor (≥100 Ω) to prevent peaking or oscillation; the 10 kHz GBW and low output impedance (<100 Ω) make such compensation straightforward in layout.
Is TS941AIDT qualified for automotive applications?
No - TS941AIDT is rated for –40°C to +85°C industrial temperature range and is not AEC-Q200 qualified. ST offers automotive-grade variants (e.g., TS941IYDT) in SO-8 with extended qualification, but the SOT23-5 TS941AIDT is intended for commercial/industrial portable equipment where automotive reliability testing is not mandated.
TS941AIDT 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:
- 5 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
TS941AIDT FAQ
1.How can I place an order for TS941AIDT through Aetrix?
Please submit a Request for Quotation (RFQ) for TS941AIDT 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 TS941AIDT reliable?
The price and inventory of TS941AIDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS941AIDT is usually 5 days.
3.What payment methods are accepted for TS941AIDT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS941AIDT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TS941AIDT?
TS941AIDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TS941AIDT 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 TS941AIDT?
For technical support, including TS941AIDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS941AIDT requirements.
6.How does Aetrix verify that TS941AIDT is sourced from the original manufacturer or authorized distributors?
All TS941AIDT 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 TS941AIDT meets industry standards.
7.What is the process for return or replacement of TS941AIDT?
All TS941AIDT units undergo pre-shipment inspection (PSI). If there is an issue with TS941AIDT, 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 TS941AIDT part is unused and in its original packaging.
Return procedure for TS941AIDT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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