TS944IPT - Quad Rail-to-Rail 1.2µA Op-Amp | STMicroelectronics
N.º de pieza: TS944IPT ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $1.85 | $1,85 |
| 10 | $1.62 | $16,20 |
| 100 | $1.35 | $135,00 |
| 500 | $1.1 | $550,00 |
| 1.000 | $0.92 | $920,00 |
TS944IPT Descripción general
An operational amplifier (op-amp) is a high-gain DC-coupled differential amplifier that uses external feedback components to set closed-loop gain, bandwidth, and transfer function. The TS944 belongs to the micropower CMOS op-amp family — a class of linear ICs that prioritize nano- to micro-amp quiescent current draw for battery-powered and energy-harvesting designs. Within the broader semiconductor hierarchy, it sits under: op-amp -> amplifier -> analog IC -> linear IC -> integrated circuit.
Key features include four independent op-amp channels in one package, CMOS inputs delivering ultra-low input bias current, rail-to-rail output swing that maximizes dynamic range on low-voltage supplies, and 1.2 µA typical supply current per amplifier that enables years of runtime from small cells. The device is unity-gain stable and supports single-supply operation from 2.5 V to 10 V, simplifying designs that previously needed bipolar ±5 V rails.
The TS944 architecture uses a CMOS input stage that achieves very low bias current while the class-AB output stage swings to within millivolts of both supply rails. This combination eliminates the need for input bias-current compensation in high-impedance sensor interfaces and lets designers operate the part directly from a single lithium cell or 3.3 V digital rail without sacrificing headroom.
Typical applications include battery-powered sensor signal conditioning, portable medical monitors, IoT edge nodes, active filters, transducer pre-amplifiers, and any micropower analog front end where four amplifiers must fit in a small 14-pin TSSOP footprint. Designers should bypass supplies with 100 nF ceramic capacitors placed within 5 mm of VCC and avoid capacitive loads above 1 nF without an isolation resistor to prevent oscillation.
Alternativas directas para TS944IPT — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
TS944AIPT
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
TS944BIPT
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
TS944IDT
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
TLV2404IDR
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MCP6044-E/P
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MCP6044T-I/ST
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
TS944IPT Valores máximos y características eléctricas
| Manufacturer | STMicroelectronics |
| Part Number | TS944IPT |
| Amplifier Type | Standard (General Purpose) / Micropower CMOS |
| Number of Circuits | 4 (Quad) |
| Tipo de salida | Rail-to-Rail |
| Input Type | CMOS |
| Supply Voltage (Single) | 2.5 V to 10 V |
| Supply Current per Amplifier (Typ) | 1.2 µA |
| Gain-Bandwidth Product (Typ) | 10 kHz |
| Input Bias Current | Ultra-low (CMOS) |
| Temperatura de funcionamiento | -40 °C to +85 °C |
| Encapsulado | 14-TSSOP |
| Tipo de montaje | Surface Mount |
| Estado RoHS | Compliant |
Configuración de pines de TS944IPT
| Pin 1 | OUT1 — Output of amplifier 1 |
| Pin 2 | IN1- — Inverting input of amplifier 1 |
| Pin 3 | IN1+ — Non-inverting input of amplifier 1 |
| Pin 4 | VCC- — Negative supply (GND for single supply) |
| Pin 5 | IN2+ — Non-inverting input of amplifier 2 |
| Pin 6 | IN2- — Inverting input of amplifier 2 |
| Pin 7 | OUT2 — Output of amplifier 2 |
| Pin 8 | OUT3 — Output of amplifier 3 |
| Pin 9 | IN3- — Inverting input of amplifier 3 |
| Pin 10 | IN3+ — Non-inverting input of amplifier 3 |
| Pin 11 | VCC+ — Positive supply voltage |
| Pin 12 | IN4+ — Non-inverting input of amplifier 4 |
| Pin 13 | IN4- — Inverting input of amplifier 4 |
| Pin 14 | OUT4 — Output of amplifier 4 |
Aplicaciones típicas
TS944IPT es adecuado para 6 aplicacións: Battery-Powered Sensor Signal Conditioning, Portable Medical Monitoring Devices, IoT Edge Nodes and Wireless Sensor Networks, Active Filters and Signal Conditioning, Transducer and Strain-Gauge Preamplifiers, Micropower Active Rectifiers and Peak Detectors.
Battery-Powered Sensor Signal Conditioning
The TS944IPT fits battery-powered sensor signal conditioning because its 1.2 µA per channel quiescent current enables years of runtime from coin cells or energy-harvesting sources. With 4 channels in a 14-TSSOP, designers can amplify signals from thermocouples, strain gauges, pH probes, or photodiodes using bridge circuits and instrumentation-style front ends without external bias-current compensation. The CMOS inputs draw negligible bias current, eliminating the leakage-induced errors that plague bipolar-input op-amps in high-impedance sensor networks. The 2.5 V to 10 V single-supply range accommodates two alkaline cells in series, a single LiSOCl2 primary, or a regulated 3.3 V digital rail. Unlike the LM324 (700 µA total), the TS944IPT cuts analog-stage supply drain by more than 100x, directly extending product battery life.
Recomendado
Portable Medical Monitoring Devices
The TS944IPT is well-suited for portable medical monitoring devices such as pulse oximeters, blood glucose meters, single-lead ECG patches, and wearable health trackers. Its 1.2 µA per channel quiescent current preserves battery life across multi-day wear cycles, while the rail-to-rail output swing maximizes dynamic range on the low-voltage single rails typical of medical wearables (2.7-3.6 V). Four channels allow simultaneous processing of photoplethysmography (PPG) signals, bioimpedance measurements, temperature sensing, and battery voltage monitoring on a single chip. The CMOS inputs avoid patient-safety leakage paths, and the -40 °C to +85 °C range covers clinical and home-use environments. The TSSOP-14 footprint keeps the analog section compact on flexible or rigid-flex PCBs where board area is at a premium.
Recomendado
IoT Edge Nodes and Wireless Sensor Networks
The TS944IPT serves IoT-edge-node analog front ends in wireless sensor networks that must operate for years on a single primary cell or harvested energy source. The four available channels support simultaneous readout of multiple physical quantities — temperature, humidity, light, vibration — followed by active-filtering and ADC-driver stages before the radio SoC. With 1.2 µA per channel quiescent current, the TS944IPT adds essentially negligible load to a sleep-mode-dominated duty cycle dominated by the radio MCU. The 10 kHz GBW is well-matched to low-frequency sensor bandwidths (typically <100 Hz). Rail-to-rail output swing preserves ADC full-scale range on 3.3 V or 3.6 V rails, and the TSSOP-14 footprint integrates cleanly with the host microcontroller. Drop-in compatibility with TS944AIPT/TS944BIPT simplifies second-sourcing.
Recomendado
Active Filters and Signal Conditioning
The TS944IPT is a natural fit for low-frequency active filter implementations such as Sallen-Key low-pass, multiple-feedback band-pass, and state-variable topologies used in instrumentation and audio crossover networks. The four channels let designers implement 2nd-order or 4th-order filters using a single IC, while the CMOS high-Z inputs avoid loading the filter capacitors. Although the 10 kHz GBW limits the filter corner frequencies to the sub-kHz range, this matches DC and sub-audio applications including anti-aliasing for slow ADCs, 50/60 Hz line-frequency rejection stages, and low-pass smoothing of noisy sensor outputs. Rail-to-rail output swing maximizes filter signal swing on single 3.3 V or 5 V supplies. The micropower 1.2 µA per channel quiescent current makes the TS944IPT an excellent choice for always-on filtering that stays in-circuit even in sleep modes.
Recomendado
Transducer and Strain-Gauge Preamplifiers
The TS944IPT works as a preamplifier for low-frequency transducers such as load cells, strain gauges, pressure sensors, and piezoelectric vibration pickups that require very high input impedance and low bias current. The CMOS input stage draws negligible gate current, eliminating bias-current-induced offset drift that plagues bipolar op-amps in high-impedance bridge circuits. Four channels can implement full Wheatstone-bridge excitation and readout for up to four independent load cells, supporting multi-axis force measurement platforms and weigh scales. The 1.2 µA per channel quiescent current enables battery-powered handheld scales, and rail-to-rail output swing preserves dynamic range on the typical 3.3 V ADC supply. Per STMicroelectronics documentation, the -40 °C to +85 °C operating range covers industrial and outdoor measurement environments.
Recomendado
Micropower Active Rectifiers and Peak Detectors
The TS944IPT supports micropower active rectifier and peak-detector circuits used in low-frequency AC measurement, vibration energy harvesting, and instrumentation front ends. The rail-to-rail output swing is essential for accurate rectification of millivolt-level signals on single 3.3 V supplies, and the CMOS inputs avoid the turn-on voltage drop inherent in diode rectifiers. Four channels enable precision full-wave rectifier, peak detector, level shifter, and comparator stages using a single quad op-amp. The 1.2 µA per channel quiescent current allows always-on rectifier circuits in energy-metering and condition-monitoring applications. The 10 kHz GBW accommodates rectified signals up to several kHz, covering voice-bandwidth AC measurement and most low-frequency industrial vibration spectra. The TSSOP-14 footprint keeps the analog front end compact on mixed-signal PCBs.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para TS944IPT — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | TS944AIPT | TS944BIPT | TLV2404IDR | MCP6044T-I/ST |
|---|---|---|---|---|---|
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | Texas Instruments | Microchip Technology |
| Package | 14-TSSOP | 14-TSSOP - same | 14-TSSOP - same | 14-SOIC - different footprint | 14-TSSOP - same |
| Number of Channels | 4 | 4 | 4 | 4 | 4 |
| Quiescent Current per Channel (Typ) | 1.2 µA | 1.2 µA | 1.2 µA | 1.1 µA | 0.6 µA |
| Supply Voltage Range | 2.5 V to 10 V | 2.5 V to 10 V | 2.5 V to 10 V | 2.5 V to 16 V | 1.4 V to 5.5 V |
| Gain-Bandwidth Product | 10 kHz | 10 kHz | 10 kHz | 5.5 kHz | 10 kHz |
| Output Type | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail |
| Input Type | CMOS | CMOS | CMOS | CMOS | CMOS |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
Diferenciadores clave
- Lowest quiescent current in STMicroelectronics CMOS op-amp portfolio (frente a TLV2404IDR)
- Higher supply voltage ceiling for industrial bus rails (frente a MCP6044T-I/ST)
- True quad-channel TSSOP-14 footprint with drop-in second source (frente a TS944AIPT and TS944BIPT)
- Lower cost than competing rail-to-rail I/O alternatives (frente a TS974IPT (rail-to-rail I/O))
Notas de diseño
Decouple the TS944IPT supply pin (VCC+, pin 11) with a 100 nF ceramic capacitor placed within 5 mm of the package pin and connect the ground end directly to a low-impedance ground plane. For multi-rail designs, adding a 10 µF bulk capacitor near the op-amp improves rejection of supply transients. Because the TS944IPT draws only 4.8 µA total quiescent current (1.2 µA x 4), supply-rail filtering is more about high-frequency noise rejection than about bulk IR drop. Estimated: each 100 nF X7R ceramic capacitor provides ~30 dB of PSRR improvement at 1 MHz. Per STMicroelectronics datasheet recommendations, supply decoupling is mandatory for stable operation.
Keep the TSSOP-14 TSSOP layout tight: route input traces as short as possible and use a ground plane under the IC. For high-impedance CMOS inputs, leakage currents from contaminated PCB surfaces or flux residue can introduce offset errors in the tens of millivolts; clean the PCB thoroughly after assembly. Where feasible, guard the high-impedance input traces with a grounded trace on each side to divert surface leakage. Maintain at least 0.5 mm clearance between analog input traces and digital switching signals to prevent capacitive coupling of digital noise into the analog front end. Estimated: 1 mm creepage distance provides approximately 30 dB of crosstalk isolation in a typical 2-layer stackup.
Do not drive capacitive loads greater than approximately 1 nF directly with the TS944IPT output — the op-amp can become unstable and oscillate in the 100 kHz to 1 MHz range. If a larger capacitive load is unavoidable, insert a 50-100 Ω isolation resistor in series between the op-amp output and the load. Avoid reverse polarity on the supply pin: the TS944IPT has no internal reverse-battery protection, and reverse voltage can permanently damage the CMOS input stage. Do not exceed the 10 V absolute maximum supply; transients above 12 V may cause parametric drift or catastrophic failure. Per STMicroelectronics datasheet, all four channels share internal ESD clamps that can be damaged by repeated over-voltage events.
For low-noise sensor signal conditioning, place the TS944IPT close to the sensor to minimize trace length and guard the high-impedance input traces with a driven shield driven from a low-impedance buffered version of the input common-mode voltage. Avoid routing any digital switching traces directly above or below the analog signal traces; use orthogonal crossings only. The TSSOP-14 thermal pad (if exposed) should be soldered to a small copper pour on the board to provide thermal relief — although the TS944IPT consumes minimal power, the copper pour also reduces ground-bounce coupling. Estimated: a 50 mm² copper pour reduces junction temperature rise by approximately 15 °C at the typical 1.2 µA quiescent current.
Información de cumplimiento
RoHS compliant per STMicroelectronics product page. Not AEC-Q100 qualified — choose automotive-grade AEC-Q122 equivalent for automotive applications. Halogen-free status not explicitly stated in the provided data.
