LM339 Quad Comparator IC Pinout Datasheet

Introduction

The LM339 is a popular quad voltage comparator IC that integrates four independent comparators into a single package. Unlike operational amplifiers, comparators are designed to switch quickly and decisively, producing a digital (binary) output that indicates which of two analog input voltages is higher. The LM339 is optimized for such applications: it can operate from a single supply voltage (or dual supplies) over a wide voltage range, and its outputs are open-collector to allow interfacing with different logic levels and wiring configurations.

One of the standout features of the LM339 is its ability to include the ground (0 V) within its input common-mode voltage range when used on a single supply. This means it can compare signals down to 0 V, which is very useful in many embedded and mixed-signal circuits. Because the outputs are open-collector, the LM339 cannot drive the output high by itself; instead, an external pull-up resistor is required, and multiple outputs can be wired together (wired-AND logic) if needed.

LM339 Quad Comparator IC

While the LM339 is widely used in hobby and industrial circuits, designers must consider its propagation delay, output saturation level, and input bias currents in more demanding designs. For many threshold detection, under-voltage protection, and sensor interface roles, it remains a go-to choice thanks to its robustness, wide supply voltage range, and low cost.

LM339 Pinout

LM339 Quad Comparator IC Datasheet Pinout — LM339 Quad Comparator IC Pinout

LM339 Key Features

Quad comparator: four independent comparators in one IC
Single-supply operation: typically 3.0 V to 36 V
Dual (split) supply operation supported: ±1.5 V to ±18 V (i.e. ± range)
Low input bias current: ~25 nA typical
Low input offset current: typically ±5 nA
Low output saturation voltage: ~130 mV at 4 mA
Input common-mode range includes ground
TTL/CMOS compatible output (via pull-ups)
ESD protection/clamps on input pins for reliability
Ability to wire outputs for wired-AND logic
Available in various packages (DIP-14, SOIC-14, TSSOP etc.)

LM339 Specifications/Characteristics

Supply Voltage Range: 3 V to 36 V (single supply) or ±1.5 V to ±18 V (dual supply)
Quiescent Supply Current: ~0.8 mA typical, independent of supply voltage
Input Offset Voltage (Vos): typically 2 mV, maximum up to 5 mV
Input Bias Current: around 25 nA typical
Input Offset Current: about ±5 nA typical
Input Common-Mode Voltage Range: from ground (0 V) up to (VCC – 1.5 V)
Output Saturation Voltage: ~130 mV at 4 mA sink current
Maximum Output Sink Current: up to 16 mA (depends on load and pull-up)
Propagation Delay (Response Time): typically 1.3 µs with overdrive
Operating Temperature Range: 0 °C to +70 °C
Package Options: 14-pin DIP, SOIC, TSSOP, and other variants

Note: DATASHEET DOWNLOAD button is provided end of this article.

Pin Configuration of LM339 Quad Comparator IC

Pin#	Pin Name	Pin Description
1	OUTPUT2	Output of comparator channel 2 (open-collector)
2	OUTPUT1	Output of comparator channel 1
3	V+ (VCC)	Positive supply voltage input
4	INPUT1–	Inverting input (–) of comparator channel 1
5	INPUT1+	Non-inverting input (+) of comparator channel 1
6	INPUT2–	Inverting input (–) of comparator channel 2
7	INPUT2+	Non-inverting input (+) of comparator channel 2
8	INPUT3–	Inverting input (–) of comparator channel 3
9	INPUT3+	Non-inverting input (+) of comparator channel 3
10	INPUT4–	Inverting input (–) of comparator channel 4
11	INPUT4+	Non-inverting input (+) of comparator channel 4
12	GND	Ground / negative supply reference (0 V)
13	OUTPUT4	Output of comparator channel 4
14	OUTPUT3	Output of comparator channel 3

LM339 Pin Configuration Table

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Key Applications of LM339 Quad Comparator IC

Voltage threshold detection, window comparators
Battery monitoring / under voltage protection
Zero-crossing detectors, AC waveform discrimination
Oscillators, pulse generation, timing circuits
Sensor interfaces (thermistor, photo-diode comparators)
Logic-level translation and interfacing to TTL/CMOS
Peak detectors, envelope detectors
Control systems, industrial automation
Power supply supervision, fault detection
Multi-channel analog decision blocks in embedded systems

LM339 Equivalent ICs / Alternatives

LM2901 – quad comparator similar to LM339, often rated for wider temperature range (–40 °C to +125 °C)
LM239 / LM139 – earlier or variant families of comparators with similar topology
LM311 – single comparator, can be used as alternative when one comparator is needed (but you’ll need four for equivalent)
LM393 – dual comparator (you’d need two to match functionality)
MC3302 – another quad comparator family sometimes used in similar roles
MAX/Kia-brand comparators (various single/dual types) depending on speed, input range, etc.

In newer versions, LM339B is offered as a drop-in upgrade with improved performance (lower offset, faster, extended voltage) compared to older LM339 versions.

(The pinout for certain ICs can vary from that of the LM339).

Datasheet of LM339 Quad Comparator IC

Click the following Button below to download the datasheet of LM339 :

Download Datasheet

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