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STMicroelectronics TS944BIDT
- Part No.:
- TS944BIDT
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TS944BIDT.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,753
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Product details
Overview
TS944BIDT from STMicroelectronics is a quad rail-to-rail output micropower operational amplifier optimized for ultra-low supply current (1.2 µA typical) and single-supply operation from 2.5 V to 10 V. It features CMOS inputs, 1 pA typical input bias current, 10 kHz gain bandwidth product, and operates across -40°C to +85°C - ideal for battery-powered smoke/fire detectors and portable pH meters.
For engineers reviewing the TS944BIDT datasheet, TS944BIDT pinout, TS944BIDT application, or TS944BIDT equivalent, key selection criteria include rail-to-rail output swing at low voltage (2.85 V at 3 V), latch-up immunity (Class A), ESD protection (2 kV HBM), stable micropower consumption over supply voltage, and SOT23-5 package compatibility with space-constrained sensor front-ends.
Technical Context
The TS944BIDT implements a CMOS-input, rail-to-rail output op-amp architecture with fixed internal compensation for unity-gain stability. Its 10 kHz gain-bandwidth product and 3 V/ms slew rate support low-frequency precision signal conditioning without phase margin degradation (65° at CL = 50 pF).
It delivers rail-to-rail output swing (e.g., 2.85 V high-level output at 3 V supply with 10 kΩ load) while maintaining constant 1.2 µA supply current across 2.5–10 V supply range - enabling reliable performance during battery discharge cycles in end-of-life conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply current | 1.2 µA typical per amplifier - enables multi-year operation on coin-cell batteries |
| Input bias current | 1 pA typical - minimizes error in high-impedance pH electrode and gas sensor interfaces |
| Gain bandwidth | 10 kHz - sufficient for DC–100 Hz sensor signal conditioning with stable phase margin |
| Output swing | Rail-to-rail - delivers full dynamic range at 2.5 V supply (e.g., 2.45 V OH / 100 mV OL at 3 V) |
| CMRR | 85 dB typical - rejects common-mode noise in unshielded industrial sensor wiring |
| ESD rating | 2 kV HBM - protects against handling damage in manual assembly of detector PCBs |
| Operating temp | -40°C to +85°C - certified for use in fire alarm enclosures and outdoor environmental sensors |
Pinout & Package
SOT23-5 package: 2.9 mm × 2.8 mm × 1.3 mm body, 0.95 mm pitch, surface-mount, lead-free ECOPACK® compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUTA) | Amplifier A output | Drives external load or next-stage input with rail-to-rail swing |
| 2 (IN−A) | Inverting input A | Accepts feedback or differential signal; 1 pA bias current preserves high-Z source integrity |
| 3 (IN+A) | Non-inverting input A | Connects to reference or sensor; CMOS input avoids loading pH probe electrodes |
| 4 (V−) | Negative supply / ground | Single-supply operation: tied to system GND; supports 2.5 V min supply |
| 5 (V+) | Positive supply | Accepts 2.5–10 V; supply current remains stable across this range |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output | Delivers >95% of supply rail swing at 10 kΩ load - maximizes ADC input range in 3 V systems |
| Micropower operation | 1.2 µA supply current independent of supply voltage - extends battery life in intermittent-sampling detectors |
| Ultra-low input bias | 1 pA typical - prevents drift in high-impedance electrochemical sensor circuits (e.g., pH, CO) |
| Latch-up immunity | Class A rated - ensures robustness against transient overvoltage in alarm system power rails |
| Single-supply range | 2.5 V minimum - enables direct interface with Li-ion or two-alkaline-cell supplies without LDO |
Applications
| Smoke/Fire Detector Front-End | pH Meter Signal Conditioning |
|---|---|
Use Scenario: Amplifies weak ion-current signals from optical smoke chamber or thermistor-based fire sensor. IC Role / Device Role / Timing Role: Precision transimpedance amplifier with rail-to-rail output driving 12-bit SAR ADC. Use Value: 1 pA input bias prevents baseline drift during long-term monitoring; 1.2 µA quiescent current enables >5-year battery life in standby mode. | Use Scenario: Buffers high-impedance glass electrode output (≥10¹² Ω) before analog filtering and digitization. IC Role / Device Role / Timing Role: Unity-gain buffer isolating electrode from downstream circuitry. Use Value: CMOS inputs avoid loading electrode capacitance; rail-to-rail swing preserves full 0–14 pH measurement range at 3.3 V MCU supply. |
| Portable Gas Sensor Interface | Battery-Powered Alarm System |
Use Scenario: Conditions low-level current output from electrochemical CO or NO₂ sensor. IC Role / Device Role / Timing Role: Low-noise, low-drift amplifier stage preceding programmable gain and ADC. Use Value: 85 dB CMRR rejects common-mode interference from shared battery return paths; stable 1.2 µA ICC ensures predictable runtime. | Use Scenario: Powers audio amplifier biasing, LED driver control logic, and sensor wake-up circuitry in wireless alarm node. IC Role / Device Role / Timing Role: Quad op-amp provides independent signal paths for multiple sensors and status indicators. Use Value: Four matched amplifiers in one SOT23-5 footprint reduce PCB area by 75% vs discrete SO-14 solution; Class A latch-up immunity prevents false triggers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad micropower op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TS944IDT | Higher input offset voltage (10 mV vs. 2 mV typ.) and no B-grade trimming | Less suitable for precision pH or low-level gas sensing where offset drift dominates error budget | Select TS944BIDT when <5 mV total input-referred offset is required over temperature |
| TS944AIDT | 5 mV max input offset (vs. 2 mV for B-grade); otherwise identical specs and pinout | Acceptable for mid-accuracy smoke detectors but not for calibrated medical-grade sensors | Choose TS944AIDT only if cost sensitivity outweighs need for lowest possible offset drift |
Compared with TS944IDT and TS944AIDT, the TS944BIDT delivers the lowest guaranteed input offset (2 mV) and tightest drift (7 µV/°C), making it the only option among the three qualified for high-accuracy, battery-operated electrochemical measurement where calibration intervals exceed 12 months.
Availability
TS944BIDT is available at Aetrix Electronics and suitable for battery-powered smoke/fire detectors, portable pH meters, electrochemical gas sensors, and low-power alarm systems requiring stable component supply across extended production lifecycles.
Supply support for TS944BIDT 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 TS94x series belongs to ST's precision analog portfolio, engineered specifically for ultra-low-power, high-impedance sensor signal conditioning in battery-constrained environments - emphasizing rail-to-rail output, sub-picoampere bias current, and robust industrial temperature operation.
FAQ
What is the maximum supply voltage for TS944BIDT?
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 due to increased junction temperature, especially in the SOT23-5 package with its 250 °C/W junction-to-ambient thermal resistance.
Does TS944BIDT support dual-supply operation?
No - the TS944BIDT is specified and characterized exclusively for single-supply operation (V− = GND, V+ = 2.5–10 V). Its input common-mode range extends to V− − 0.2 V and V+ − 1.3 V, and output swings rail-to-rail within that constraint; dual-supply use is neither tested nor guaranteed.
Can TS944BIDT drive a 10 kΩ load at 3 V supply?
Yes - at 3 V supply and 25°C, the TS944BIDT delivers 2.85 V high-level output and 100 mV low-level output into a 10 kΩ load, confirming full rail-to-rail capability under realistic sensor-buffering conditions. Output current capability exceeds ±650 µA, well above the 300 µA required for this load.
Is TS944BIDT pin-compatible with other TS944 variants?
Yes - all TS944 variants (IDT, AIDT, BIDT, IPT) share identical pinouts and footprints across their respective packages (SO-14, TSSOP14, SOT23-5). The TS944BIDT in SOT23-5 is functionally and physically interchangeable with TS944IDT and TS944AIDT in the same package, differing only in trimmed input offset specifications.
TS944BIDT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- 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:
- 2 mV
- Current - Supply:
- 1.2µA (x4 Channels)
- 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:
- 14-SO
TS944BIDT FAQ
1.How can I place an order for TS944BIDT through Aetrix?
Please submit a Request for Quotation (RFQ) for TS944BIDT 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 TS944BIDT reliable?
The price and inventory of TS944BIDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS944BIDT is usually 5 days.
3.What payment methods are accepted for TS944BIDT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS944BIDT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TS944BIDT?
TS944BIDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TS944BIDT 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 TS944BIDT?
For technical support, including TS944BIDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS944BIDT requirements.
6.How does Aetrix verify that TS944BIDT is sourced from the original manufacturer or authorized distributors?
All TS944BIDT 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 TS944BIDT meets industry standards.
7.What is the process for return or replacement of TS944BIDT?
All TS944BIDT units undergo pre-shipment inspection (PSI). If there is an issue with TS944BIDT, 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 TS944BIDT part is unused and in its original packaging.
Return procedure for TS944BIDT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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