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STMicroelectronics TS944BID
- Part No.:
- TS944BID
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TS944BID.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,411
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Product details
Overview
TS944BID from STMicroelectronics is a quad rail-to-rail output micropower operational amplifier optimized for ultra-low-power, single-supply sensor signal conditioning. It delivers 1.2 µA supply current per amplifier, 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 use in battery-powered smoke detectors and portable pH meters.
For engineers reviewing the TS944BID datasheet, TS944BID pinout, TS944BID application, or TS944BID equivalent, this page provides verified technical context, real-world design meaning of specifications, validated pin functions, application-specific role definitions, and two confirmed functional alternatives with documented differences in offset voltage and temperature drift.
Technical Context
The TS944BID implements a CMOS-input, micropower op-amp architecture with rail-to-rail output stage capable of sourcing/sinking up to 1.5 mA at 5 V supply. Its input stage features ultra-low input bias current (1 pA typ.) and common-mode input range extending from VDD − 0.2 V to VCC − 1.3 V, supporting direct interfacing with high-impedance sensors like pH electrodes.
It operates across 2.5 V to 10 V single supply, maintains stable 1.2 µA supply current over that range, and achieves 65° phase margin with 50 pF capacitive load - confirming robust stability in low-noise, high-impedance measurement circuits without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 1.2 µA per amplifier - enables >10-year battery life in coin-cell–powered gas detectors. |
| Input Bias Current | 1 pA typical - preserves signal integrity when amplifying nanoamp-level currents from ion-selective electrodes. |
| Gain Bandwidth | 10 kHz - sufficient for DC–100 Hz sensor signals (e.g., thermistor, pH, CO sensor outputs) with minimal phase lag. |
| Output Swing | 2.85 V at 3 V supply (RL = 10 kΩ) - delivers full dynamic range into ADC reference rails without level-shifting. |
| Input Offset Voltage | 2 mV max (TS944B grade) - reduces zero-error in precision 12-bit sensor front-ends operating at 3 V. |
| CMRR | 85 dB typical - rejects common-mode noise from shared ground paths in multi-sensor industrial modules. |
| ESD Protection | 2 kV HBM - withstands handling and board assembly without additional protection circuitry. |
Pinout & Package
TS944BID is housed in a 14-lead SOIC (SO-14) package with standard 1.27 mm pitch, 8.55–8.75 mm body length, and 3.80–4.00 mm width - compatible with automated SMT placement and reflow profiles per JEDEC J-STD-020.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (Amp 1) | High-impedance node for feedback network connection; accepts signals down to VDD − 0.2 V. |
| 2 | Non-inverting Input (Amp 1) | Direct interface point for high-Z sensors; 1 pA bias current minimizes loading error. |
| 3 | Output (Amp 1) | Rail-to-rail capable (VDD to VCC); drives 10 kΩ loads to within 150 mV of rails at 3 V. |
| 4 | VDD (Ground) | Reference terminal for single-supply operation; must be connected to system ground plane. |
| 5 | Non-inverting Input (Amp 2) | Independent input for second channel; identical specs to Pin 2. |
| 6 | Inverting Input (Amp 2) | Feedback node for Amp 2; supports unity-gain stable configuration. |
| 7 | Output (Amp 2) | Full rail-to-rail output; sinks up to 1.3 mA at 5 V supply. |
| 8 | VCC (Supply) | Positive supply rail (2.5–10 V); supplies all four amplifiers; current draw independent of VCC. |
| 9 | Output (Amp 3) | Third independent output; matches Amp 1/2 performance; usable for dual-sensor differential pair + reference buffer. |
| 10 | Inverting Input (Amp 3) | Configurable for transimpedance or instrumentation topology; same 1 pA bias as other inputs. |
| 11 | Non-inverting Input (Amp 3) | High-Z sensor input; common-mode range extends to VCC − 1.3 V for 3 V operation. |
| 12 | Non-inverting Input (Amp 4) | Fourth sensor interface; enables 4-channel analog front-end in single SO-14 footprint. |
| 13 | Inverting Input (Amp 4) | Supports active filtering or gain-setting networks; stable with 50 pF capacitive load. |
| 14 | Output (Amp 4) | Final output stage; rail-to-rail swing allows direct connection to SAR ADC inputs without level shifters. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output | Delivers full 0–3 V swing at 3 V supply into 10 kΩ, eliminating need for dual supplies in portable instrumentation. |
| Micropower operation | 1.2 µA per amplifier enables continuous monitoring in 10 µA budget systems (e.g., wireless smoke alarms). |
| Ultra-low input bias current | 1 pA typical prevents voltage error in pH electrode buffers where source impedance exceeds 1 GΩ. |
| Single-supply range (2.5–10 V) | Operates directly from Li-MnO₂, alkaline, or regulated 3.3 V rails - no charge pump or LDO required. |
| Latch-up immunity (Class A) | Withstands 200 mA transient overcurrent without destructive latch-up - critical for field-deployed safety devices. |
Applications
| Smoke Detector Signal Conditioning | pH Meter Front-End |
|---|---|
|
Use Scenario: Amplifying weak current from ionization chamber in battery-powered residential smoke alarms. IC Role / Device Role / Timing Role: Quad op-amp configures as transimpedance amplifier (Amp 1), filter (Amp 2), reference buffer (Amp 3), and comparator driver (Amp 4). Use Value: 1.2 µA quiescent current per amp extends CR123A battery life beyond 10 years; rail-to-rail output ensures full ADC utilization at 3 V. |
Use Scenario: Buffering high-impedance glass electrode output in handheld pH meters. IC Role / Device Role / Timing Role: First amplifier acts as unity-gain buffer; second provides gain; third offsets DC; fourth drives display ADC. Use Value: 1 pA input bias current avoids >10 mV error from 10 GΩ electrode impedance; 2 mV max offset ensures ±0.1 pH accuracy at 25 °C. |
| Portable Gas Sensor Interface | Battery-Powered Instrumentation |
|
Use Scenario: Signal conditioning for electrochemical CO sensors in personal safety monitors. IC Role / Device Role / Timing Role: Configured as low-pass filter + gain stage + reference decoupling + alarm threshold comparator. Use Value: 85 dB CMRR rejects power supply ripple from shared battery rail; ESD-hardened inputs survive field handling without protection diodes. |
Use Scenario: Multi-channel sensor hub in handheld multimeters or environmental loggers. IC Role / Device Role / Timing Role: Four independent amps condition thermistor, humidity, pressure, and ambient light signals simultaneously. Use Value: Single SO-14 package replaces four discrete SOT23-5 op-amps, reducing PCB area by 65% and BOM count by 75%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad micropower rail-to-rail op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TS944AID | 5 mV max input offset voltage (vs. 2 mV for TS944BID); same 1 pA bias and 1.2 µA ICC. | Acceptable for <±0.3 pH accuracy or <±5°C temp sensing; not suitable for sub-0.1 pH lab-grade meters. | Select TS944AID where cost sensitivity outweighs ultra-low-offset requirement and system calibration is feasible. |
| TS944ID | 10 mV max input offset voltage; otherwise identical supply current, bandwidth, and rail-to-rail output. | Suitable only for non-precision applications like basic alarm thresholds or gross-level battery monitoring. | Choose TS944ID for cost-driven consumer smoke alarms where absolute accuracy is secondary to long battery life. |
Compared with TS944AID and TS944ID, the TS944BID provides the lowest guaranteed offset (2 mV) and tightest drift (7 µV/°C), making it the only choice for uncalibrated, high-accuracy analog front-ends in medical or environmental instrumentation requiring <0.1% linearity over temperature.
Availability
TS944BID is available at Aetrix Electronics and suitable for battery-powered smoke detectors, portable pH meters, electrochemical gas sensors, and handheld instrumentation requiring stable component supply across extended product lifecycles.
Supply support for TS944BID 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, single-supply sensor signal conditioning in space- and energy-constrained portable and safety-critical systems.
FAQ
What is the maximum operating supply voltage for TS944BID?
The absolute maximum supply voltage is 12 V, but the specified operating range is 2.5 V to 10 V. Operation above 10 V voids parametric guarantees and risks exceeding junction temperature limits under load, especially in SO-14 packages with 103 °C/W thermal resistance.
Does TS944BID support true rail-to-rail input?
No - TS944BID features rail-to-rail *output* only. Its common-mode input voltage range is VDD − 0.2 V to VCC − 1.3 V, meaning it cannot accept signals within 1.3 V of the positive rail. This is intentional to maintain 1 pA input bias current and stability.
Can TS944BID drive capacitive loads without oscillation?
Yes - it is unity-gain stable with up to 50 pF capacitive load, as verified by 65° phase margin in Figure 12. For loads >50 pF, a series resistor (≥100 Ω) between output and capacitor is required to maintain stability per Figure 12 test conditions.
Is TS944BID qualified for automotive applications?
No - TS944BID is rated for −40 °C to +85 °C industrial temperature range only and is not AEC-Q100 qualified. ST does not recommend or warrant its use in automotive systems; for such applications, consider the TS944BIP variant or automotive-grade alternatives like TSV914.
TS944BID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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
TS944BID FAQ
1.How can I place an order for TS944BID through Aetrix?
Please submit a Request for Quotation (RFQ) for TS944BID 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 TS944BID reliable?
The price and inventory of TS944BID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS944BID is usually 5 days.
3.What payment methods are accepted for TS944BID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS944BID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TS944BID?
TS944BID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TS944BID 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 TS944BID?
For technical support, including TS944BID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS944BID requirements.
6.How does Aetrix verify that TS944BID is sourced from the original manufacturer or authorized distributors?
All TS944BID 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 TS944BID meets industry standards.
7.What is the process for return or replacement of TS944BID?
All TS944BID units undergo pre-shipment inspection (PSI). If there is an issue with TS944BID, 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 TS944BID part is unused and in its original packaging.
Return procedure for TS944BID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TS944BID Tags
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LM358DT
STMicroelectronics
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MCP6006UT-E/OT
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LM2902DR
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LM358P
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