My Inquiry
My Account
STMicroelectronics TS931IDT
- Part No.:
- TS931IDT
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TS931IDT.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,485
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TS931IDT from STMicroelectronics is a rail-to-rail output, micropower single 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 portable pH meters and digital scales requiring precision, low-power analog front-ends.
For engineers reviewing the TS931IDT datasheet, TS931IDT pinout, TS931IDT application, or TS931IDT equivalent, key selection criteria include rail-to-rail output drive at 3 V, ultra-low input bias current for high-impedance sensor interfacing, micropower operation for multi-year battery life, and automotive-grade temperature range (-40 °C to +105 °C) compliance.
Technical Context
The TS931IDT employs CMOS input stage architecture enabling 1 pA typical input bias current and rail-to-rail output swing via complementary push-pull output stage. Its 100 kHz gain-bandwidth product and 50 V/ms slew rate support DC-coupled instrumentation signal conditioning with minimal phase shift up to ~10 kHz.
It achieves 85 dB common-mode and supply voltage rejection ratios across full temperature range, ensuring stable DC accuracy in noisy, single-supply environments. Input voltage range extends from VCC− −0.2 V to VCC+ −1.5 V, supporting direct connection to sensors operating near ground or supply rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7 V to 10 V - enables direct use with single-cell Li-ion (3.0–3.7 V), two-cell alkaline (2.7–3.2 V), or regulated 5 V/3.3 V rails. |
| Supply Current (per amp) | 20 μA typ. - supports >10-year battery life in coin-cell-powered smoke detectors or portable sensors. |
| Input Bias Current | 1 pA typ. - minimizes voltage error when interfacing with high-impedance pH electrodes (>1 GΩ) or piezoresistive sensors. |
| Input Offset Voltage | 2 mV max. (TS931B) - ensures ≤0.2% full-scale error in 1 V-range digital scale front-ends without trimming. |
| Output Swing (3 V supply) | 2.95 V high / 10 mV low into 100 kΩ - delivers >98% of rail-to-rail dynamic range for maximum ADC utilization. |
| Gain-Bandwidth Product | 100 kHz - sufficient for anti-aliasing filtering and DC-stable transimpedance amplification up to ~10 kHz. |
| CMRR / PSRR | 85 dB min. - rejects power supply ripple and common-mode noise in automotive cabin sensor nodes. |
Pinout & Package
TS931IDT is housed in an SO-8 package (4.9 mm × 6.0 mm × 1.75 mm), RoHS-compliant and ECOPACK® certified, with standard 1.27 mm pitch and surface-mount compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (−) | Differential input node; accepts signals referenced to VCC−; high-impedance CMOS input (1 pA bias). |
| 2 | Non-inverting Input (+) | Differential input node; used for unity-gain buffer or reference-sensing configurations. |
| 3 | Output | Rail-to-rail voltage source/sink; drives loads ≥100 kΩ directly; 1.5 mA short-circuit current capability. |
| 4 | VCC− (Ground) | Negative supply terminal; must be connected to system ground or lowest potential rail. |
| 5 | VCC+ | Positive supply terminal; accepts 2.7–10 V; decoupling capacitor (100 nF) required within 5 mm. |
| 6–8 | No Connect (NC) | Internally unconnected pins; left floating or tied to ground per layout best practice to reduce parasitic coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output | Delivers 2.95 V output at 3 V supply, maximizing dynamic range for 10-bit+ ADCs without level-shifting circuitry. |
| Micropower operation | 20 μA supply current enables continuous monitoring in battery-powered smoke detectors with >5-year shelf life. |
| Ultra-low input bias current | 1 pA typical allows direct interface with glass pH electrodes and high-Z capacitive sensors without guard traces. |
| Automotive-grade temperature range | -40 °C to +105 °C operation supports under-hood and cabin-mounted sensor modules per AEC-Q100 Class 2. |
| ESD protection | 2 kV HBM rating reduces need for external TVS diodes in handheld medical or industrial test equipment. |
Applications
| pH Meter Front-End | Digital Scale Signal Conditioning |
|---|---|
Use Scenario: Amplifying mV-level output from glass pH electrode in portable handheld meter. IC Role / Device Role / Timing Role: Precision DC-coupled non-inverting amplifier with gain = 1000, rejecting electrode polarization drift. Use Value: 1 pA input bias prevents electrode loading-induced measurement drift; 2 mV offset ensures ±0.02 pH accuracy over full 0–14 range. | Use Scenario: Conditioning microvolt-level bridge output from load cell in battery-powered kitchen scale. IC Role / Device Role / Timing Role: Low-noise, zero-drift instrumentation amplifier input stage with rail-to-rail output swing. Use Value: 20 μA quiescent current extends CR2032 battery life to >2 years; 85 dB CMRR suppresses 50/60 Hz mains interference. |
| Smoke Detector Analog Sensor Interface | Automotive Cabin CO₂ Sensor Amplifier |
Use Scenario: Amplifying photoelectric chamber current in UL-certified residential smoke alarm. IC Role / Device Role / Timing Role: Transimpedance amplifier converting photocurrent to voltage with stable DC baseline. Use Value: 2.7 V minimum supply enables direct use with aging 9 V alkaline batteries; latch-up immunity prevents field failures during ESD events. | Use Scenario: Signal conditioning for NDIR CO₂ sensor in vehicle HVAC control module. IC Role / Device Role / Timing Role: Low-drift, high-PSRR amplifier driving SAR ADC in 12 V automotive system with wide ambient temperature swings. Use Value: -40 °C to +105 °C operation ensures reliability across parked-car extremes; 85 dB PSRR maintains accuracy despite alternator ripple. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar rail-to-rail, micropower op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP6001T-I/OT | Higher 100 μA supply current; 2.5 mV offset; SOT-23-5 only | Lacks automotive temp range; not qualified for AEC-Q100 | Prefer TS931IDT where battery life >5 years or automotive qualification is mandatory. |
| LMV321IDBVR | 38 μA supply current; 7 mV offset; 1.5 MHz GBW | Better bandwidth but higher power; no 1 pA bias current | Choose TS931IDT for ultra-high-impedance sensor interfaces where bias current dominates error budget. |
Compared with MCP6001T-I/OT and LMV321IDBVR, TS931IDT uniquely combines 1 pA input bias, 20 μA supply current, and AEC-Q100-compliant temperature range-making it irreplaceable for long-life, high-impedance, automotive-qualified analog sensing.
Availability
TS931IDT is available at Aetrix Electronics and suitable for battery-powered systems, portable communication systems, and automotive cabin sensor modules requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for TS931IDT 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, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.
The TS93x series belongs to ST's precision analog portfolio, engineered specifically for ultra-low-power, rail-to-rail signal conditioning in space-constrained, battery-operated instrumentation and safety-critical sensor nodes.
FAQ
What is the maximum capacitive load the TS931IDT can drive while maintaining stability?
The TS931IDT is characterized for stability with up to 50 pF capacitive load when driving 100 kΩ resistive load, as verified in Figure 13 and Figure 14 of the datasheet. Driving >50 pF requires external isolation resistor (≥100 Ω) between output and capacitance to prevent peaking or oscillation.
Does TS931IDT support true rail-to-rail input common-mode range?
No. The input common-mode range is specified as VCC− −0.2 V to VCC+ −1.5 V - meaning it does not accept inputs within 1.5 V of the positive rail. This limitation is inherent to its CMOS input stage design and must be accounted for in level-shifting or reference design.
Is the TS931IDT pin-compatible with other TS93x variants like TS932IDT or TS934IDT?
No. TS931IDT is a single-channel SO-8 device (pins 1–5 active, 6–8 NC), while TS932IDT (dual) and TS934IDT (quad) use different pinouts and channel counts. Direct substitution is not possible without PCB redesign and schematic revision.
What is the thermal resistance (RthJA) of the SO-8 package for TS931IDT?
The SO-8 package has a junction-to-ambient thermal resistance of 125 °C/W under standard JEDEC 2-layer board conditions (2 oz copper, 1 in² pad), as specified in Table 2 of the datasheet. This value assumes no internal thermal vias or heatsinking.
TS931IDT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 10 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
TS931IDT FAQ
1.How can I place an order for TS931IDT through Aetrix?
Please submit a Request for Quotation (RFQ) for TS931IDT 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 TS931IDT reliable?
The price and inventory of TS931IDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS931IDT is usually 5 days.
3.What payment methods are accepted for TS931IDT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS931IDT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TS931IDT?
TS931IDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TS931IDT 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 TS931IDT?
For technical support, including TS931IDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS931IDT requirements.
6.How does Aetrix verify that TS931IDT is sourced from the original manufacturer or authorized distributors?
All TS931IDT 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 TS931IDT meets industry standards.
7.What is the process for return or replacement of TS931IDT?
All TS931IDT units undergo pre-shipment inspection (PSI). If there is an issue with TS931IDT, 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 TS931IDT part is unused and in its original packaging.
Return procedure for TS931IDT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TS931IDT Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
