STMicroelectronics TS861AIN

Overview

TS861AIN from STMicroelectronics is a rail-to-rail, micropower BiCMOS single comparator optimized for battery-powered systems. It operates from 2.7 V to 10 V, consumes only 6 µA per comparator at 2.7 V, delivers 500 ns propagation delay with 100 mV overdrive, and features push-pull output eliminating external pull-up resistors - enabling direct interfacing with microcontrollers in low-power smoke detectors.

For engineers reviewing the TS861AIN datasheet, TS861AIN pinout, TS861AIN application, or TS861AIN equivalent, key selection criteria include ultra-low supply current, rail-to-rail CMOS input range (–0.3 V to V_CC + 0.3 V), push-pull output drive capability, 2.7–10 V supply flexibility, and SOT23-5 package suitability for space-constrained portable designs.

Technical Context

The TS861AIN uses a BiCMOS input stage enabling rail-to-rail common-mode input voltage range (–0.3 V to V_CC + 0.3 V) while maintaining low input bias current (≤600 pA) and low input offset voltage (typ. 3 mV). Its push-pull CMOS output stage drives logic-level loads directly without pull-up resistors and supports sink/source currents up to 5 mA.

It achieves 500 ns propagation delay at 2.7 V with 100 mV overdrive and maintains stable performance across –40 °C to +85 °C. ESD protection (2 kV HBM) and Class A latch-up immunity ensure robustness in portable industrial sensing environments.

Key Specifications

Pinout & Package

SOT23-5 micropackage (ECOPACK® compliant), 5-pin surface-mount device with exposed pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar rail-to-rail micropower comparator applications.

Compared with TLV339IPWR and MAX9021AXK+T, TS861AIN uniquely balances 6 µA quiescent current, 500 ns speed, push-pull output, and 2.7–10 V operation - making it optimal for space- and energy-constrained portable safety devices requiring zero-external-component MCU interfacing.

Availability

TS861AIN is available at Aetrix Electronics and suitable for battery-powered smoke detectors, portable gas sensors, low-voltage battery monitors, and wireless alarm controllers requiring stable component supply across long production lifecycles.

Supply support for TS861AIN 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, mixed-signal, power, and microcontroller solutions for industrial, automotive, and consumer markets.

The TS86x family was developed specifically for ultra-low-power, rail-to-rail sensing in portable safety and monitoring systems - prioritizing micropower operation, robust output drive, and wide supply flexibility over high-speed or precision op-amp functionality.

FAQ

What is the maximum operating temperature range for TS861AIN?

The TS861AIN is specified for operation from –40 °C to +85 °C ambient temperature. This range is fully characterized and guaranteed across all electrical parameters including input offset voltage, propagation delay, and supply current. The device's Class A latch-up immunity and 2 kV HBM ESD rating further ensure reliability under thermal stress in enclosed portable enclosures.

Does TS861AIN require external pull-up resistors on its output?

No. TS861AIN features a push-pull CMOS output stage capable of actively driving both high and low logic states. At V_CC = 5 V, it can source up to 5 mA and sink up to 5 mA, allowing direct connection to standard 3.3 V or 5 V MCU GPIO pins without pull-up resistors - reducing component count and PCB area in space-constrained designs.

Can TS861AIN operate from a single 1.8 V supply?

No. TS861AIN has a minimum supply voltage of 2.7 V, as confirmed by absolute maximum ratings (V_CC = 12 V max) and operating conditions tables. Attempting operation below 2.7 V results in undefined behavior, including failure to achieve rail-to-rail input range and unreliable output switching. For 1.8 V systems, consider dedicated low-voltage comparators such as the TLV3691.

Is the SOT23-5 package of TS861AIN lead-free and RoHS-compliant?

Yes. TS861AIN is offered in ECOPACK®-compliant SOT23-5 packaging, meeting RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. STMicroelectronics confirms lead-free terminations and halogen-free molding compounds; full compliance documentation is available via ST's official product page and ECOPACK® database.