Silicon Labs TSM973ESA+T

Overview

TSM973ESA+T from Silicon Laboratories is a dual-channel micropower comparator with integrated 1.182V ±1% reference, open-drain outputs, and adjustable hysteresis-designed for ultra-low-quiescent-current battery-powered systems operating from +2.5V to +11V single supply or ±1.25V to ±5.5V dual supply. It delivers 6μA max supply current over temperature, 12μs propagation delay at 10mV overdrive, and input common-mode range extending to V− and within 1.3V of V+.

For engineers reviewing the TSM973ESA+T datasheet, TSM973ESA+T pinout, TSM973ESA+T application, or TSM973ESA+T equivalent, key selection criteria include its dual-comparator + reference architecture, guaranteed ±1% reference accuracy across −40°C to +85°C, open-drain output compatibility with wired-OR logic, and support for external hysteresis via the HYST pin without additional op-amps or feedback networks.

Technical Context

The TSM973ESA+T integrates two independent comparators sharing a precision internal reference and a dedicated HYST pin enabling user-configurable hysteresis on both channels. Its input stage operates rail-to-rail on the negative side and supports common-mode voltages up to V+ − 1.3V, making it suitable for high-side sensing in low-voltage systems.

Output stages are open-drain N-channel MOSFETs sinking to V− (not GND), requiring external pull-up resistors. The REF pin sources/sinks up to 25μA/15μA and is referenced to V−-enabling accurate threshold generation without external voltage dividers in many configurations.

Key Specifications

Pinout & Package

Package: 8-pin SOIC (Small Outline Integrated Circuit), JEDEC MS-012 compliant, body dimensions 4.80–5.00 mm × 3.73–3.89 mm, lead pitch 1.27 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX973ESA+, TSM973ESA+T offers identical performance and footprint with Silicon Labs' extended lifecycle support; versus TSM982ESA+T, it provides tighter reference accuracy and integrated hysteresis control-reducing design risk in battery-critical applications.

Availability

TSM973ESA+T is available at Aetrix Electronics and suitable for battery-powered systems, industrial sensor nodes, and portable medical devices requiring stable component supply with guaranteed −40°C to +85°C operation and RoHS-compliant packaging.

Supply support for TSM973ESA+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, MCU, wireless, and sensor applications-with emphasis on energy efficiency and system integration.

The TSM973ESA+T belongs to Silicon Labs' TSM97x micropower comparator family, engineered specifically for ultra-long-life, space-constrained applications where quiescent current, reference stability, and hysteresis configurability are critical.

FAQ

What is the operating temperature range for the TSM973ESA+T?

The TSM973ESA+T is rated for −40°C to +85°C ambient operation (industrial grade). This range is validated across all key parameters including supply current (max 6μA), reference voltage (1.182V ±2%), and propagation delay (12μs at 10mV overdrive). The "E" suffix in the part number explicitly denotes this extended temperature grade, distinguishing it from the 0°C to +70°C "C" variants.

Does the TSM973ESA+T require external bypass capacitors?

The TSM973ESA+T does not mandate power-supply bypass capacitors under typical conditions, but Silicon Labs recommends a 0.1μF ceramic capacitor placed close to the V+ and V− pins when supply impedance is high, PCB traces are long, or noise is present. This practice minimizes supply-induced jitter and ensures stable reference and comparator operation-especially critical in low-overdrive hysteresis applications.

Can the TSM973ESA+T operate from a single 3V supply?

Yes, the TSM973ESA+T fully supports single-supply operation from +2.5V to +11V-including 3V. At 3V, it maintains 6μA max supply current over temperature, 1.182V ±2% reference accuracy, and 12μs propagation delay at 10mV overdrive. Input common-mode range extends from V− (GND) to V+ − 1.3V (1.7V), enabling direct sensing of 0–1.7V signals without level shifting.

How is hysteresis configured on the TSM973ESA+T?

Hysteresis on the TSM973ESA+T is configured using the HYST pin (Pin 5) with two external resistors: R1 between REF and HYST, and R2 between HYST and V−. This creates a programmable hysteresis band up to 100mV. When unused, HYST must be tied to REF. The internal HYST circuitry eliminates need for external op-amps or feedback paths-simplifying layout and improving reliability versus discrete hysteresis implementations.

What is the output structure of the TSM973ESA+T and how should it be interfaced?

The TSM973ESA+T features open-drain N-channel outputs (OUTA and OUTB) that sink current to V−-not GND. To assert logic HIGH, an external pull-up resistor must connect each output to a defined voltage rail (e.g., V+, 3.3V, or 5V). This architecture enables wired-OR logic, level translation across voltage domains, and flexible interface with MCUs, FPGAs, or discrete logic-without risk of shoot-through or contention.