Texas Instruments LM393TLX

Overview

LM393TLX from Texas Instruments is a dual, low-power, precision voltage comparator IC with open-collector outputs, designed for single-supply operation from 2.0 V to 36 V. It delivers ±3 mV max input offset voltage, 25 nA input bias current, and 0.4 mA supply current at 5 V - enabling accurate threshold detection in battery-powered sensors and industrial control interfaces.

For engineers reviewing the LM393TLX datasheet, LM393TLX pinout, LM393TLX application, or LM393TLX equivalent, this page provides verified electrical parameters, validated SOIC-8 package mapping, confirmed dual-comparator functional role, real-world timing behavior (1.3 μs response), and two technically documented alternative parts for design continuity.

Technical Context

The LM393TLX implements two independent PNP-input comparators with rail-to-rail input common-mode range including ground, enabling direct sensing of signals near 0 V under single-supply conditions. Its open-collector NPN output stage supports TTL/CMOS/MOS logic interfacing and wired-OR configurations.

It operates across 0°C to +70°C ambient temperature, draws supply current independent of V+, and tolerates differential input voltages up to 36 V - making it suitable for high-voltage monitoring without external level-shifting circuitry.

Key Specifications

Pinout & Package

LM393TLX is packaged in an 8-pin SOIC (Small Outline Integrated Circuit) with 4.90 mm × 3.91 mm body size and standard 1.27 mm pitch. The package is RoHS-compliant and rated for surface-mount reflow assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual open-collector comparator applications.

Compared with LM393DR and LM2903DT, the LM393TLX offers identical core comparator functionality in cut-tape form, optimized for evaluation and small-batch builds - while LM2903DT adds extended temperature support for harsh environments, and LM393DR provides reel-based logistics efficiency without electrical trade-offs.

Availability

LM393TLX is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial control interfaces, and consumer appliance sensing applications requiring stable component supply and long-term manufacturing continuity.

Supply support for LM393TLX 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

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision signal conditioning and power-efficient IC design.

The LM393TLX belongs to TI's legacy precision comparator product line, engineered for cost-sensitive, high-reliability applications where low power, ground-sensing capability, and logic interoperability are essential - especially in industrial automation and portable electronics.

FAQ

What is the operating temperature range for the LM393TLX?

The LM393TLX is specified for operation from 0°C to +70°C ambient temperature. This commercial-grade range aligns with typical indoor electronic equipment requirements. For designs needing −40°C to +85°C operation, TI recommends the functionally identical LM2903DT, which shares the same SOIC-8 package and electrical characteristics but extends the temperature specification. Always verify thermal derating in high-power-density PCB layouts.

Does the LM393TLX require external pull-up resistors on its outputs?

Yes, the LM393TLX features open-collector NPN outputs that can only sink current - they cannot source it. Each output (OUTA and OUTB) requires an external pull-up resistor to a defined logic voltage (e.g., 3.3 V, 5 V, or 12 V) to establish a valid HIGH state. Typical values range from 2.2 kΩ to 10 kΩ depending on speed and drive strength needs. Without pull-ups, outputs remain floating and undefined.

Can the LM393TLX compare input voltages higher than its V+ supply?

Yes - the LM393TLX supports differential input voltages up to 36 V, independent of the V+ supply voltage. For example, with V+ = 5 V, inputs may safely reach +36 V on one pin while the other remains within the common-mode range (0 V to V+ − 1.5 V). This enables high-side sensing in 24 V systems without attenuators. However, input voltages must not go below −0.3 V relative to GND.

Is the LM393TLX pin-compatible with the LM339 quad comparator?

No - the LM393TLX is a dual comparator in an 8-pin SOIC package, while the LM339 is a quad comparator in a 14-pin SOIC package. They share identical per-channel electrical behavior and open-collector output architecture, but pin count, pin functions, and physical layout differ. Replacing LM393TLX with LM339 requires PCB redesign. For drop-in dual replacements, LM393DR or LM2903DT are validated alternatives.

What is the maximum output sink current for the LM393TLX?

The LM393TLX output transistors can sink up to 16 mA per channel while maintaining saturation voltage ≤400 mV. At 4 mA sink, saturation voltage is guaranteed ≤250 mV - critical for driving TTL or low-threshold CMOS inputs. Exceeding 16 mA causes the output to exit saturation, raising voltage and potentially violating logic LOW thresholds. Always verify load current against datasheet curves across temperature and supply voltage.