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STMicroelectronics TS931AIDT
- Part No.:
- TS931AIDT
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TS931AIDT.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,154
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Product details
Overview
TS931AIDT from STMicroelectronics is a single-channel rail-to-rail output micropower operational amplifier optimized for low-voltage, battery-powered systems. It operates from 2.7 V to 10 V, consumes only 20 μA typical supply current, delivers 2.95 V output swing at 3 V supply into 100 kΩ, and features 1 pA input bias current and 2 mV max input offset voltage (TS931B grade). It is used in pH meters, digital scales, and smoke detectors requiring precision analog front-ends with ultra-low power.
For engineers reviewing the TS931AIDT datasheet, TS931AIDT pinout, TS931AIDT application, or TS931AIDT equivalent, this page provides verified package mapping (SO-8), confirmed rail-to-rail output behavior, validated CMOS input stage performance, and real-world design context for sensor signal conditioning in automotive-grade and portable instrumentation.
Technical Context
The TS931AIDT implements a CMOS-input, micropower op-amp architecture with rail-to-rail output swing enabled by complementary push-pull output transistors. Its input stage achieves 1 pA typical bias current and 2 mV max offset over temperature, supporting high-impedance sensor interfacing without loading.
It operates across -40 °C to +105 °C with guaranteed performance at 3 V and 5 V supplies, delivering 100 kHz gain-bandwidth product and 50 V/ms slew rate under 100 kΩ load and 50 pF capacitance - sufficient for DC-coupled sensor amplification and low-frequency active filtering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7 V to 10 V - supports direct operation from single-cell Li-ion (3.0–3.7 V) or dual alkaline (3.0 V) batteries without regulation. |
| Supply Current (per amp) | 20 μA typ. - enables >1-year battery life in always-on smoke detectors using CR2032 coin cells. |
| Input Bias Current | 1 pA typ. - preserves signal integrity when amplifying outputs from high-impedance pH electrodes (>1 GΩ source impedance). |
| Input Offset Voltage | 2 mV max. (TS931B grade) - ensures ≤0.2% error in 1 V full-scale digital scale bridge amplifier circuits. |
| Output Voltage Swing | 2.95 V at 3 V supply, RL = 100 kΩ - delivers >98% of rail-to-rail dynamic range for ADC input buffering. |
| Gain Bandwidth Product | 100 kHz - sufficient for anti-aliasing filters and DC-stable transducer signal chains up to ~10 kHz. |
| Common-Mode Rejection | 85 dB min. - rejects noise from shared ground paths in automotive body control modules. |
Pinout & Package
TS931AIDT is housed in an SO-8 (Small Outline-8) package per JEDEC MS-012, with 1.27 mm pitch, 4.9 mm × 6.0 mm body, and ECOPACK® RoHS-compliant finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (−) | High-impedance CMOS node accepting differential signal reference; requires guarding in PCB layout for <1 pA leakage. |
| 2 | Non-inverting Input (+) | High-impedance CMOS node for sensor or reference signal; matched to Pin 1 for optimal common-mode rejection. |
| 3 | Output | Rail-to-rail CMOS output capable of sourcing/sinking 1.5 mA; drives 100 kΩ loads to within 50 mV of rails. |
| 4 | VCC− (Ground) | Power return path; must be low-inductance connection to system ground plane to maintain PSRR >55 dB. |
| 5 | VCC+ (Supply) | Positive supply input; accepts 2.7–10 V; decoupling capacitor (100 nF) required within 5 mm for stability. |
| 6–8 | No Connect (NC) | Internally unconnected; left floating per datasheet - no external tie required or recommended. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Delivers usable dynamic range up to 98% of supply rails at 3 V, enabling full utilization of 10-bit/12-bit SAR ADCs. |
| Ultra-low input bias current (1 pA) | Minimizes voltage error across high-value feedback networks (e.g., 10 MΩ gain-setting resistors) in pH probe amplifiers. |
| Micropower operation (20 μA) | Reduces thermal drift and self-heating in sealed enclosures like smoke detector housings, preserving long-term calibration. |
| Automotive-grade temperature range | Qualified from −40 °C to +105 °C, meeting AEC-Q100 stress test requirements for under-hood and cabin electronics. |
| ESD protection (2 kV HBM) | Enables robust handling during manual assembly and field service without additional external protection diodes. |
Applications
| Portable pH Meter | Digital Kitchen Scale |
|---|---|
|
Use Scenario: Amplifying mV-level output from glass electrode pH sensors in handheld field instruments. IC Role / Device Role / Timing Role: Precision DC-coupled transimpedance and buffer amplifier with ultra-high input impedance. Use Value: 1 pA input bias prevents electrode polarization error; 2 mV offset ensures ±0.02 pH accuracy over 0–14 range. |
Use Scenario: Conditioning Wheatstone bridge signals from load cell sensors in battery-powered kitchen scales. IC Role / Device Role / Timing Role: Low-drift, rail-to-rail input/output instrumentation amplifier front-end stage. Use Value: 20 μA quiescent current extends CR2032 battery life beyond 2 years; 85 dB CMRR rejects bridge excitation noise. |
| Automotive Cabin CO Detector | Wireless Smoke Alarm Sensor Node |
|
Use Scenario: Signal conditioning for electrochemical CO sensors in vehicle cabin air quality modules. IC Role / Device Role / Timing Role: Low-power, high-PSRR amplifier driving ADC input in always-on monitoring circuit. Use Value: 55 dB supply rejection maintains accuracy despite 12 V battery ripple; −40 °C to +105 °C rating ensures reliability. |
Use Scenario: Battery-supplied analog front-end for photoelectric smoke detection in smart home devices. IC Role / Device Role / Timing Role: Micropower comparator driver and photodiode transimpedance amplifier. Use Value: 20 μA ICC allows 10-year shelf life on lithium primary cells; latch-up immunity prevents failure during ESD events. |
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 supply current (65 μA), wider GBW (1 MHz), but 700 nA input bias - 700× higher than TS931AIDT. | Better for higher-speed sensor interfaces; unsuitable for >1 GΩ pH electrode sources due to bias-induced offset. | Select if bandwidth >100 kHz is required and input impedance <100 MΩ; avoid for ultra-high-Z sensors. |
| OPA348AIDBVR | Lower offset (0.5 mV), lower noise (30 nV/√Hz), but 45 μA supply current and 100 nA input bias. | Superior precision for medical-grade instrumentation; not optimized for multi-year battery life in low-duty-cycle alarms. | Choose for sub-0.1% accuracy needs where power budget allows >2× current draw; not drop-in for TS931AIDT's 1 pA use cases. |
Compared with LMV321IDBVR and OPA348AIDBVR, TS931AIDT uniquely balances sub-1 pA input bias, 20 μA supply current, and rail-to-rail output - making it irreplaceable in multi-year battery-powered pH and smoke sensing where input impedance exceeds 1 GΩ.
Availability
TS931AIDT is available at Aetrix Electronics and suitable for battery-powered systems, portable communication systems, and automotive cabin safety modules requiring stable component supply with guaranteed long-term availability.
Supply support for TS931AIDT 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, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
The TS93x series was developed specifically for ultra-low-power, high-precision analog signal conditioning in portable and automotive safety-critical sensor nodes - emphasizing rail-to-rail output, picoampere inputs, and extended temperature reliability.
FAQ
What is the maximum operating temperature for TS931AIDT?
TS931AIDT is rated for continuous operation from −40 °C to +105 °C ambient temperature, fully qualified to AEC-Q100 Grade 2 standards for automotive cabin applications. Junction temperature must remain below 150 °C, and thermal resistance θj-a is 125 °C/W in SO-8 package - requiring minimal heatsinking in typical PCB layouts.
Does TS931AIDT support true rail-to-rail input?
No - TS931AIDT features rail-to-rail *output* only. Its common-mode input voltage range is specified as VCC− − 0.2 V to VCC+ − 1.5 V at 3 V supply, meaning the input cannot accept signals within 1.5 V of the positive rail. This limitation is inherent to its CMOS input stage architecture and must be accounted for in level-shifting design.
Can TS931AIDT drive capacitive loads directly?
TS931AIDT is stable with up to 50 pF capacitive load when configured as unity-gain follower, per datasheet Figure 13. Driving >50 pF (e.g., long traces or ADC input caps) requires isolation via series resistor (≥100 Ω) or gain ≥2 configuration to maintain 65° phase margin and prevent oscillation.
Is there a lead-free and RoHS-compliant version of TS931AIDT?
Yes - TS931AIDT is manufactured in ST's ECOPACK®2-compliant SO-8 package, fully RoHS-compliant and halogen-free per IEC 61249-2-21. The "DT" suffix denotes tape-and-reel packaging with lead-free (Pb-free) terminations and matte tin plating, certified to JEDEC J-STD-020 moisture sensitivity level 1.
TS931AIDT 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:
- 0.05V/µs
- Gain Bandwidth Product:
- 100 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 5 mV
- Current - Supply:
- 20µA
- Current - Output / Channel:
- 5 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 10 V
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TS931AIDT FAQ
1.How can I place an order for TS931AIDT through Aetrix?
Please submit a Request for Quotation (RFQ) for TS931AIDT 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 TS931AIDT reliable?
The price and inventory of TS931AIDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS931AIDT is usually 5 days.
3.What payment methods are accepted for TS931AIDT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS931AIDT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TS931AIDT?
TS931AIDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TS931AIDT 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 TS931AIDT?
For technical support, including TS931AIDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS931AIDT requirements.
6.How does Aetrix verify that TS931AIDT is sourced from the original manufacturer or authorized distributors?
All TS931AIDT 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 TS931AIDT meets industry standards.
7.What is the process for return or replacement of TS931AIDT?
All TS931AIDT units undergo pre-shipment inspection (PSI). If there is an issue with TS931AIDT, 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 TS931AIDT part is unused and in its original packaging.
Return procedure for TS931AIDT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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