Texas Instruments LM393BIDDFR

Overview

LM393BIDDFR from Texas Instruments is a dual precision voltage comparator in an 8-pin SOT-23 package, designed for single-supply operation from 2 V to 36 V. It delivers ±0.37 mV typical input offset voltage, 200 µA per comparator quiescent current, 1 µs propagation delay, and operates across –40°C to +85°C. It serves as a high-reliability signal-level decision device in power supply monitoring and motor control feedback loops.

For engineers reviewing the LM393BIDDFR datasheet, LM393BIDDFR pinout, LM393BIDDFR application, or LM393BIDDFR equivalent, key selection criteria include input offset voltage stability over temperature, rail-to-rail input common-mode range down to ground, open-collector output compatibility with TTL/MOS/CMOS logic families, and robust 2 kV HBM ESD rating for industrial environments.

Technical Context

The LM393BIDDFR implements two independent comparators with dedicated ESD clamps enabling 2 kV HBM tolerance. Its input stage supports common-mode voltages from –0.1 V to (V_CC – 2 V), allowing direct sensing of signals referenced to ground or near-rail inputs without level shifting.

Propagation delay is specified at 1 µs under 5 mV overdrive with 15 pF load and 5.1 kΩ pull-up; output sinking capability reaches 21 mA at 1.5 V saturation while maintaining <400 mV low-level output voltage at 4 mA sink current.

Key Specifications

Pinout & Package

The LM393BIDDFR is housed in an 8-pin SOT-23 package (2.90 mm × 1.60 mm body size) with exposed pad thermal connection to GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM393DR and LM2903BQDRQ1, the LM393BIDDFR offers superior offset voltage and faster response in a space-constrained SOT-23 package, while retaining industrial temperature range and enhanced ESD robustness - making it optimal for compact, high-performance embedded control.

Availability

LM393BIDDFR is available at Aetrix Electronics and suitable for server power supply monitoring, cordless power tool battery management, and building automation sensor interface applications requiring stable component supply and long-term industrial lifecycle support.

Supply support for LM393BIDDFR 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 delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The LM393B series belongs to TI's precision comparator product line, engineered for high-accuracy voltage comparison in harsh environments with minimal external components and guaranteed performance across wide temperature and supply ranges.

FAQ

What is the maximum supply voltage rating for LM393BIDDFR?

The LM393BIDDFR supports a maximum supply voltage of 36 V, with absolute maximum rating up to 38 V. This allows direct integration into 24 V industrial systems and tolerance of transient overvoltages without external clamping. The specification is confirmed in Section 5.1 Absolute Maximum Ratings of the official TI datasheet SLCS005AH.

Does LM393BIDDFR support rail-to-rail input operation?

Yes, the LM393BIDDFR supports a common-mode input voltage range from –0.1 V to (V_CC – 2 V), which includes ground and extends close to the positive rail. This enables direct interfacing with sensors referenced to ground or signals near V_CC, eliminating level-shifting circuitry. Verified in Section 5.5 Electrical Characteristics for LM393B.

What is the typical propagation delay of LM393BIDDFR under standard test conditions?

The LM393BIDDFR exhibits a typical propagation delay of 1 µs under conditions of 5 mV input overdrive, 15 pF load capacitance, 5.1 kΩ pull-up resistor, and V_CC = 5 V at 25°C. This value is documented in Section 5.7 Switching Characteristics and applies across the full –40°C to +85°C operating range.

Can LM393BIDDFR replace legacy LM393 devices on existing PCBs?

Yes, the LM393BIDDFR is a drop-in replacement for LM393, LM293, and LM2903 in compatible packages. It shares identical pinout, electrical interface, and footprint in SOT-23. Key improvements - including lower offset, faster response, and higher ESD rating - require no layout changes. Confirmed in the "B-version is drop-in replacement" statement in Section 1 Features.

What output logic families is LM393BIDDFR compatible with?

The LM393BIDDFR features open-collector outputs compatible with TTL, MOS, and CMOS logic families. External pull-up resistors allow interfacing to 3.3 V, 5 V, or higher logic rails. Output sinking capability of 21 mA at 1.5 V saturation ensures reliable drive into standard logic inputs. This compatibility is explicitly stated in Section 1 Features and verified in Section 5.5 VOL and IOL specifications.