Texas Instruments LM393AP

Overview

LM393AP from Texas Instruments is a dual voltage comparator IC designed for single-supply operation across 2 V to 30 V, featuring ±4 mV max input offset voltage, 1.3 µs typical response time, 25 nA max input bias current, and rail-to-rail common-mode input range down to ground - widely used in power supply monitoring, motor control feedback, and industrial sensor interface circuits.

For engineers reviewing the LM393AP datasheet, LM393AP pinout, LM393AP application, or LM393AP equivalent, this page delivers verified electrical specs, SOIC-8 package details, real-world use cases in server PSUs and cordless tools, and two validated alternative parts with documented functional differences.

Technical Context

The LM393AP belongs to the legacy LM393 family (non-B version), operating as two independent open-collector comparators with internal ESD protection and no phase-reversal under overdrive. Its input stage supports common-mode voltages from ground to VCC − 2 V, enabling direct sensing of low-side current shunts and battery terminals.

It uses bipolar transistor input stages with complementary NPN/PNP pairs, delivering stable performance across 0°C to +70°C ambient, and exhibits predictable propagation delay variation with input overdrive - critical for timing-critical window comparator designs in UPS and motor drive enable logic.

Key Specifications

Pinout & Package

LM393AP is supplied in an 8-pin SOIC (Small Outline Integrated Circuit) package with 4.90 mm × 3.91 mm body size and standard 1.27 mm pitch. The package is surface-mount, RoHS-compliant, and rated for reflow per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM393DR and LM2903P, the LM393AP offers the lowest-cost solution for commercial-temperature applications with identical functionality and layout compatibility - while LM2903P adds extended thermal resilience at modest offset penalty, and LM393DR provides enhanced manufacturing compliance without performance trade-offs.

Availability

LM393AP is available at Aetrix Electronics and suitable for server PSU monitoring, cordless power tool battery management, and building automation sensor interface applications requiring stable component supply and long-term industrial availability.

Supply support for LM393AP 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 experience in precision signal conditioning and power management ICs.

The LM393AP belongs to TI's foundational dual comparator product line, engineered for reliability in commercial-grade power management, industrial control, and consumer electronics - emphasizing ease of use, wide supply tolerance, and robust input stage design.

FAQ

What is the maximum supply voltage rating for LM393AP?

The LM393AP has an absolute maximum supply voltage of 36 V, but its recommended operating range is 2 V to 30 V. Operating above 30 V may degrade long-term reliability and is not guaranteed by specifications. For designs requiring 36 V operation, the LM393B variant is specified up to 36 V with improved parameters.

Does LM393AP support rail-to-rail input common-mode range?

The LM393AP supports a common-mode input voltage range from ground (0 V) to VCC − 2 V. It does not support true rail-to-rail input (i.e., up to VCC), but the ability to operate down to ground enables direct interface with low-side current sense amplifiers and battery monitoring circuits without level shifting.

Can LM393AP outputs be wired together for OR logic?

Yes - the LM393AP features open-collector outputs, allowing multiple outputs (including from different LM393AP units) to be connected to a shared pull-up resistor. This enables hardware-level wired-OR functionality for fault-bus signaling, priority encoding, or multi-sensor alarm aggregation without additional logic gates.

What is the typical propagation delay of LM393AP at 5 V supply?

At VCC = 5 V, 25°C, and 100 mV input overdrive, the LM393AP exhibits a typical propagation delay of 1.3 µs for both high-to-low and low-to-high transitions. Delay decreases with higher overdrive and increases slightly at temperature extremes - data sheet Figure 5-11 confirms <1.5 µs across 0°C to +70°C.

Is LM393AP pin-compatible with LM393DR or LM2903P?

Yes - LM393AP, LM393DR, and LM2903P all use the standard SOIC-8 package with identical pinout (1OUT, 1IN−, 1IN+, GND, 2IN+, 2IN−, 2OUT, VCC). No PCB changes are required when substituting among these parts, though LM2903P operates across −40°C to +125°C and LM393DR offers MSL-1 handling compliance.