onsemi LM293AN

Overview

LM293AN from STMicroelectronics is a dual low-power voltage comparator operating from single supply (+2V to +36V) or split supplies (±1V to ±18V), featuring rail-to-rail input common-mode range including ground, ±1 mV typical input offset voltage, and TTL/CMOS-compatible open-collector outputs. It enables precision threshold detection in battery-powered industrial sensors and 5V/12V power monitoring circuits.

For engineers reviewing the LM293AN datasheet, LM293AN pinout, LM293AN application, or LM293AN equivalent, key selection criteria include input offset voltage stability over temperature, output sink current capability at low V_CC, common-mode range compatibility with grounded reference signals, and DIP-8 package suitability for through-hole prototyping and legacy PCB layouts.

Technical Context

The LM293AN integrates two independent comparators with PNP input stages enabling input voltages down to −0.3 V (relative to V_CC−) and up to V_CC+ − 1.5 V. Its differential input voltage range equals the full supply voltage (±36 V), supporting wide-swing signal comparison without clamping diodes.

Output stage uses open-collector NPN transistors capable of sinking 6 mA minimum at 1.5 V saturation, compatible with 5 V TTL logic and 3.3 V CMOS loads when pulled up externally. Supply current remains constant at 0.4 mA typ. across 5–30 V operation, enabling predictable power budgeting in low-power systems.

Key Specifications

Pinout & Package

DIP-8 plastic package (0.300" wide), through-hole mount, JEDEC MS-001 compliant. Body dimensions: 9.8 mm × 6.35 mm × 3.3 mm (L × W × H).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual low-voltage comparator applications.

Compared with LM393N and TLV3702IP, the LM293AN uniquely balances extended temperature operation (−40°C to +105°C), wide supply flexibility (+2 V to +36 V), and DIP-8 through-hole compatibility - making it optimal for industrial field equipment where reliability, legacy board support, and multi-rail interoperability are mandatory.

Availability

LM293AN is available at Aetrix Electronics and suitable for industrial power monitoring, battery management systems, zero-crossing detection circuits, and transducer signal conditioning requiring stable component supply across extended temperature and voltage ranges.

Supply support for LM293AN 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, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The LMx93 series was developed specifically for robust, low-cost dual-comparator functions in cost-sensitive industrial controls and power systems where ground-referenced sensing and wide supply tolerance are essential.

FAQ

Can LM293AN operate with a single 3.3 V supply?

Yes. The LM293AN supports single-supply operation from +2 V to +36 V, including 3.3 V. At 3.3 V, input common-mode range extends from 0 V to 1.8 V, and output saturation voltage remains ≤400 mV at 4 mA sink - enabling direct interface with 3.3 V logic when pulled up to 3.3 V.

Does LM293AN require external pull-up resistors on its outputs?

Yes. Both outputs are open-collector NPN transistors and must be pulled up to a voltage rail (≤36 V) via external resistors. Typical values range from 1.8 kΩ (for 5 V TTL) to 10 kΩ (for low-power CMOS), selected based on sink current and rise time requirements.

What is the maximum input voltage allowed when using LM293AN with a 5 V single supply?

With V_CC+ = 5 V and V_CC− = 0 V, each input may swing from −0.3 V to +3.5 V (V_CC+ − 1.5 V). Voltages beyond this range risk increased input current or latch-up; however, differential input voltage may reach ±36 V without damage.

How does LM293AN compare to LM339 in terms of pin compatibility and performance?

The LM293AN (DIP-8) is not pin-compatible with LM339 (DIP-14), which contains four comparators. Electrically, LM293AN offers lower input offset (±1 mV vs. ±2 mV typ.) and lower supply current (0.4 mA vs. 0.8 mA typ.), but LM339 supports wider supply range (±18 V / 36 V) and higher output sink current (16 mA vs. 6 mA min.).