Silicon Labs TSM982ESA+T

Overview

TSM982ESA+T from Silicon Laboratories is a dual-channel, micropower analog comparator with integrated 1.182V ±2% reference and adjustable hysteresis, operating from single +2.5V to +11V or dual ±1.25V to ±5.5V supplies. It draws ≤6μA max supply current over temperature, features open-drain outputs for wired-OR logic, and supports input common-mode range from V− to V+ − 1.3V - ideal for precision threshold detection in battery-powered sensor interfaces.

For engineers reviewing the TSM982ESA+T datasheet, TSM982ESA+T pinout, TSM982ESA+T application, or TSM982ESA+T equivalent, key selection criteria include its ultra-low quiescent current, internal reference accuracy across −40°C to +85°C, dual-comparator hysteresis capability, and SOIC-8 package compatibility with legacy MAX982 designs.

Technical Context

The TSM982ESA+T implements two independent rail-to-rail input comparators sharing a single 1.182V reference output (REF) and dedicated hysteresis control (HYST) pin. Its open-drain outputs sink current to V−, requiring external pull-up resistors for logic-level translation or wired-OR bus operation.

It supports true single-supply operation with V− tied to GND, or dual-supply mode with V− at negative potential - enabling level-shifting between ±5V analog signals and 3.3V/5V digital domains. Propagation delay is 12μs (high-to-low) at 10mV overdrive with 100pF load and 1MΩ pull-up.

Key Specifications

Pinout & Package

Package: 8-pin SOIC (Small Outline Integrated Circuit), JEDEC MS-012 compliant, 3.9mm × 4.9mm footprint, 1.27mm lead pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX982ESA+, TSM982ESA+T offers identical performance and form factor as a qualified alternate source; compared with TSM973ESA+T, it trades ±1% reference accuracy for higher hysteresis flexibility and broader industrial temperature support in cost-sensitive applications.

Availability

TSM982ESA+T is available at Aetrix Electronics and suitable for battery-powered systems, industrial sensor interfaces, and power-rail monitoring applications requiring stable component supply across extended temperature ranges.

Supply support for TSM982ESA+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 TSM982ESA+T belongs to Silicon Labs' TSM9xx micropower comparator family, designed specifically for energy-constrained systems needing precision threshold detection without external references or complex support circuitry.

FAQ

What is the operating temperature range for the TSM982ESA+T?

The TSM982ESA+T is rated for −40°C to +85°C ambient operation, with all electrical specifications guaranteed across this industrial temperature range. Its internal 1.182V reference maintains ±2% accuracy over this span, and supply current remains ≤6μA maximum - making it suitable for outdoor sensor nodes and automotive cabin modules where thermal stability is critical. The "E" suffix in TSM982ESA+T explicitly denotes this extended temperature grade.

Does the TSM982ESA+T require external pull-up resistors on its outputs?

Yes, the TSM982ESA+T features open-drain outputs that sink current to V−, so external pull-up resistors are mandatory to establish a defined logic-high state. Typical values range from 10kΩ to 100kΩ depending on speed and drive requirements; the datasheet specifies 1MΩ for propagation delay characterization. Without pull-ups, outputs remain floating and cannot assert HIGH - a fundamental requirement for wired-OR logic, level translation, or interfacing with CMOS/TTL inputs.

Can the internal reference of the TSM982ESA+T be used to bias external circuits?

Yes, the REF pin of the TSM982ESA+T can source up to 25μA and sink up to 15μA while maintaining ±2% accuracy over temperature, enabling direct biasing of resistor dividers, op-amp references, or low-current sensor excitation circuits. However, the REF pin must not be bypassed with capacitors, as this may destabilize the internal reference circuitry and increase noise - a design constraint explicitly called out in the datasheet.

How is hysteresis implemented on the TSM982ESA+T?

Hysteresis on the TSM982ESA+T is implemented via the dedicated HYST pin, which accepts a voltage between REF − 50mV and REF. Connecting two resistors - R1 from REF to HYST and R2 from HYST to V− - creates positive feedback that shifts trip points. The resulting hysteresis band equals twice the voltage difference between REF and HYST, allowing precise, resistor-tuned hysteresis up to 100mV without modifying comparator feedback paths.

Is the TSM982ESA+T pin-compatible with the MAX982 series?

Yes, the TSM982ESA+T is electrically and form-factor identical to the MAX982 family per the manufacturer's documentation, including identical pinout, SOIC-8 package dimensions, and absolute maximum ratings. This makes it a drop-in replacement in existing MAX982 designs - no PCB layout changes, schematic updates, or firmware modifications are required to migrate to TSM982ESA+T for supply chain or cost optimization.