STMicroelectronics TS331ILT

Overview

TS331ILT from STMicroelectronics is a single-channel micropower rail-to-rail input comparator optimized for ultra-low-voltage battery-powered systems. It operates from 1.6 V to 5.0 V, draws only 20 µA typical supply current at 1.8 V, achieves 210 ns propagation delay (high-to-low) with 100 mV overdrive, and features open-drain output with 24 mV low-saturation voltage at 1 mA sink - enabling direct interface with I²C-bus logic or microcontroller GPIO in portable power management circuits.

For engineers reviewing the TS331ILT datasheet, TS331ILT pinout, TS331ILT application, or TS331ILT equivalent, this device is selected for precision threshold detection in space-constrained, low-quiescent-power designs where rail-to-rail input common-mode range (-0.2 V to V_CC + 0.2 V), automotive-grade temperature support (-40 °C to +125 °C), and HBM ESD robustness (2 kV) are critical requirements.

Technical Context

The TS331ILT implements a CMOS input stage with rail-to-rail input voltage capability spanning (V_CC–) – 0.2 V to (V_CC+) + 0.2 V at 25 °C, enabling accurate sensing near supply rails. Its open-drain output supports wired-OR configurations and level-shifting without external pull-up constraints.

Propagation delay is characterized across supply voltages (1.8 V/2.7 V/5 V) and temperature (–40 °C to +125 °C), with T_PHL = 210 ns (typ.) and T_PLH = 420 ns (typ.) at 100 mV overdrive, V_CC = 1.8 V, 25 °C. Input offset voltage drift is specified at 4.5 µV/°C over full temperature range.

Key Specifications

Pinout & Package

SOT23-5 package: 5-pin surface-mount plastic package with exposed pad option (not electrically connected); footprint compatible with SC70-5; JEDEC MO-178AA compliant; thermal resistance R_thJA = 250 °C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV3691IDBVR and MAX9021AUT+T, the TS331ILT uniquely balances 20 µA supply current, 210 ns propagation delay, and true rail-to-rail input operation - making it optimal for cost-sensitive, space-constrained battery supervisors needing both precision and responsiveness.

Availability

TS331ILT is available at Aetrix Electronics and suitable for battery voltage monitoring, low-power wake-up detection, and USB power path supervision requiring stable component supply across automotive, industrial, and consumer portable electronics programs.

Supply support for TS331ILT 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, MEMS, power, and microcontroller solutions for industrial, automotive, and consumer markets.

The TS33x family targets ultra-low-power, rail-to-rail input comparators for battery-operated and energy-harvesting applications - emphasizing micropower efficiency, wide temperature operation, and small-footprint packaging.

FAQ

What is the maximum recommended supply voltage for TS331ILT?

The absolute maximum supply voltage is 5.5 V, but the functional operating range is strictly 1.6 V to 5.0 V per datasheet Table 2. Operation above 5.0 V risks parametric shift and reduced reliability, even if below the 5.5 V absolute limit. Designers must ensure V_CC+ – V_CC– remains within 1.6–5.0 V for guaranteed performance across temperature.

Can TS331ILT drive an LED directly from its output?

Yes - the open-drain output can sink up to 22 mA at 2.7 V supply (Table 4), sufficient to drive standard indicator LEDs with appropriate series resistance. At 1.8 V supply, sink current drops to 20 mA (Table 3), still adequate for low-current LEDs. Ensure V_OUT remains below 30 mV at target current to maintain logic-low recognition by downstream circuitry.

Does TS331ILT require external hysteresis for stable switching?

No - hysteresis is not internally integrated, but the device's low input bias current (≤40 nA) and rail-to-rail input enable stable external hysteresis implementation using high-value feedback resistors (e.g., 10 MΩ) without degrading accuracy. Internal propagation delay variation (<10% over temperature) further reduces need for large hysteresis margins.

Is the SOT23-5 package of TS331ILT RoHS and REACH compliant?

Yes - TS331ILT is manufactured in ST's ECOPACK2-compliant SOT23-5 package, meeting RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. The "L" suffix in TS331ILT denotes lead-free finish and halogen-free molding compound, verified per ST's published ECOPACK documentation.