Silicon Labs TSM982CUA+T

Overview

TSM982CUA+T from Silicon Laboratories is a dual-channel, micropower analog comparator with integrated 1.182V ±2% reference and adjustable hysteresis via HYST pin. It operates from single +2.5V to +11V or dual ±1.25V to ±5.5V supplies, draws ≤6μA max over temperature, features open-drain outputs for wired-OR logic, and targets battery-powered threshold detection and window comparator circuits.

For engineers reviewing the TSM982CUA+T datasheet, TSM982CUA+T pinout, TSM982CUA+T application, or TSM982CUA+T equivalent, key selection criteria include ultra-low quiescent current (≤6μA), internal reference accuracy (±2% over 0°C to +70°C), 12μs propagation delay at 10mV overdrive, open-drain output compatibility with pull-up networks, and hysteresis programmability using two external resistors.

Technical Context

The TSM982CUA+T implements two independent comparators sharing a common internal 1.182V reference referenced to V−, with dedicated HYST pins enabling user-adjustable hysteresis on both channels. Input common-mode range extends from V− to V+ − 1.3V, supporting rail-to-rail input operation in single-supply configurations.

Its open-drain output stage sinks current to V− (not GND), requiring external pull-up resistors for logic-level translation. Propagation delay is specified at 12μs (high-to-low) under 10mV overdrive with 100pF load and 1MΩ pull-up, while low-to-high response is slower (300μs) due to RC time constant limitations.

Key Specifications

Pinout & Package

Package: 8-pin MSOP (3.0mm × 3.0mm, 0.65mm pitch), RoHS-compliant, lead-free per JEDEC MS-012.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual comparator with reference applications.

Compared with MAX982CSA+, TSM982CUA+T offers identical performance and drop-in compatibility; compared with TSM973CUA+T, it trades ±1% reference accuracy for lower cost while retaining all other features including hysteresis control and ultra-low current draw.

Availability

TSM982CUA+T is available at Aetrix Electronics and suitable for battery-powered systems, power supply monitors, and portable medical devices requiring stable component supply with long-term lifecycle support.

Supply support for TSM982CUA+T 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

Silicon Laboratories is a fabless semiconductor company specializing in low-power, mixed-signal ICs for timing, IoT, and embedded control applications.

The TSM982CUA+T belongs to the TSM97x/98x micropower comparator family, designed specifically for energy-constrained applications where ultra-low supply current and integrated reference reduce system complexity.

FAQ

What is the operating temperature range for TSM982CUA+T?

The TSM982CUA+T is rated for operation from −40°C to +85°C (industrial grade). Its electrical specifications-including 6μA maximum supply current and 1.182V ±2% reference-are guaranteed across this full range. The device uses the "E" temperature suffix in ordering nomenclature, confirming its extended thermal capability. This makes TSM982CUA+T suitable for automotive cabin modules, industrial sensors, and outdoor portable equipment where ambient temperatures fluctuate widely.

Does TSM982CUA+T require external bypass capacitors?

TSM982CUA+T does not mandate external bypass capacitors for basic operation, but Silicon Labs recommends a 0.1μF ceramic capacitor placed close to the V+ and V− pins when power supply impedance is high, traces are long, or noise is present. This practice stabilizes the internal reference and comparator core, especially critical in battery-powered systems where supply ripple can induce false triggering. The TSM982CUA+T's ultra-low current draw makes it less sensitive to supply noise than higher-power comparators, but bypassing remains good design practice per the manufacturer's layout guidelines.

Can TSM982CUA+T be used with a single 3.3V supply?

Yes, TSM982CUA+T operates fully within specification at 3.3V single supply (V+ = 3.3V, V− = GND). Electrical characteristics-including 6μA max supply current, 12μs propagation delay, and 1.182V reference-are validated at 3V and 5V. The input common-mode range extends from GND to 2.0V (V+ − 1.3V), allowing direct sensing of 0–2V signals. For 3.3V systems, connect GND (Pin 1) to V− (Pin 2) and use pull-up resistors on OUTA/OUTB referenced to 3.3V. This configuration is explicitly supported in the datasheet's "Single-Supply Operation" section.

How is hysteresis implemented on TSM982CUA+T?

Hysteresis on TSM982CUA+T is implemented via the HYST pin (Pin 5), which accepts a voltage between REF (Pin 6) and REF − 50mV. Applying a voltage in this range creates a hysteresis band proportional to the voltage difference: V_HB = 2 × (V_REF − V_HYST). Two external resistors (R1 from REF to HYST, R2 from HYST to V−) set this voltage. For example, with R1 = 100kΩ and R2 = 2.4MΩ, a 5mV hysteresis band is achieved. This method avoids feedback across outputs and maintains independence between the two comparators-unlike traditional resistor-based hysteresis that couples channels.

What is the output sink capability of TSM982CUA+T?

TSM982CUA+T's open-drain outputs (OUTA and OUTB) sink current to V−, not GND. At V+ = 5V and V− = 0V, the output low voltage is ≤0.4V at 1.8mA sink current. When V− is negative (e.g., −5V dual supply), the output swings from V+ down to V−, enabling true bipolar operation. The absolute maximum sink current is 50mA, but continuous operation above 1.8mA requires thermal derating per the 8-pin MSOP package's 330mW dissipation limit. For standard logic interfacing, a 10kΩ pull-up to 3.3V or 5V delivers ~0.3mA sink current-well within safe operating limits.