Texas Instruments LM339LVDR

Overview

LM339LVDR from Texas Instruments is a quad low-voltage rail-to-rail input comparator with open-drain outputs, operating from 1.65 V to 5.5 V supply. It delivers 400 µV typical input offset voltage, 600 ns typical propagation delay, and 25 µA per channel quiescent current across –40°C to +125°C, enabling precision voltage monitoring in space-constrained industrial power supplies.

For engineers reviewing the LM339LVDR datasheet, LM339LVDR pinout, LM339LVDR application, or LM339LVDR equivalent, this device supports robust overvoltage detection, battery charge control, and motor fault sensing where low supply headroom, high ESD immunity (2 kV HBM), and Power-On-Reset–guaranteed startup state are critical.

Technical Context

The LM339LVDR integrates four independent comparators sharing a common supply and ground, each featuring rail-to-rail input stages capable of accepting voltages up to 6 V without damage or phase inversion. Its internal Power-On-Reset circuit forces all outputs into high-impedance until V_CC exceeds 1.65 V, eliminating false triggering during power ramp-up or brownout conditions.

Each comparator uses a low-input-bias-current (5 pA typical) architecture with 2 pF differential input capacitance and 60–65 dB CMRR at 5 V, supporting stable operation in noisy environments such as server PSUs and motor drive feedback loops where input common-mode range extends to GND and V_CC.

Key Specifications

Pinout & Package

LM339LVDR is supplied in a 14-pin SOIC package (3.91 mm × 8.65 mm body size) with standard JEDEC outline. The device features four independent comparators, two no-connect (NC) pins, and shared V+ and GND terminals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM339DR and TL339CDR, LM339LVDR offers superior low-voltage accuracy (0.4 mV vs. ≥1.5 mV), guaranteed safe startup via POR, and 2× lower quiescent current-making it optimal for modern 3.3 V/1.8 V industrial and automotive power management.

Availability

LM339LVDR is available at Aetrix Electronics and suitable for server PSU supervision, motor drive fault detection, battery charge control, and overvoltage protection requiring stable component supply across extended temperature ranges and low-voltage operation.

Supply support for LM339LVDR 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 company specializing in analog and embedded processing technologies, with leadership in precision analog ICs and industrial-grade components.

The LM339LVDR belongs to TI's LV comparator family, designed specifically to replace legacy LM339 in ≤5 V applications with enhanced performance, rail-to-rail inputs, and integrated Power-On-Reset functionality.

FAQ

What is the maximum input voltage allowed on the IN+ and IN– pins of the LM339LVDR?

The LM339LVDR supports rail-to-rail inputs with failsafe operation up to 6 V on both IN+ and IN– pins, regardless of the V+ supply voltage (1.65–5.5 V). This allows direct connection to higher-voltage sensors or signals without external clamping, as confirmed in Section 5.1 Absolute Maximum Ratings and Section 3 Description of the datasheet.

Does the LM339LVDR have built-in Power-On-Reset functionality?

Yes, the LM339LVDR includes an integrated Power-On-Reset (POR) circuit that holds all four outputs in a high-impedance state until the V+ supply reaches and stabilizes above 1.65 V. This prevents erroneous output transitions during power-up or brownout events, as detailed in Section 3 Description and Section 4.3 Pin Functions of the datasheet.

Can the LM339LVDR replace the standard LM339 in existing designs?

Yes, the LM339LVDR is specified as an improved replacement for the LM339 family in applications with V_CC ≤ 5 V. It maintains pin compatibility in SOIC-14 packaging and adds rail-to-rail inputs, lower offset (0.4 mV vs. 2 mV), lower quiescent current (25 µA vs. 500 µA), and POR-enabling drop-in upgrades where supply voltage is ≤5 V.

What is the typical propagation delay of the LM339LVDR at 3.3 V supply?

The LM339LVDR exhibits 600 ns typical propagation delay (both high-to-low and low-to-high) at 3.3 V supply, as verified in Section 5.12 Switching Characteristics. This value remains consistent across –40°C to +125°C and is measured with 15 pF load and 2.5 kΩ pull-up, supporting timing-critical functions like overcurrent cutoff in motor drives.

Are the NC pins on the LM339LVDR required to be grounded?

No, the two NC pins (pins 3 and 10 in SOIC-14) are not internally connected and may be left floating. However, TI's layout recommendations in Section 7.4 advise tying NC pins to GND to improve thermal conduction and reduce noise coupling-especially in high-density PCBs used in server PSUs and industrial controls.