BETAPIN 1 · Not connected
No connectionNC
Function
No internal connection for the selected fourteen-pin package.
How to connect
Leave open; do not connect to ground.
High-speed dual voltage comparator
LM319 Pinout
Explore LM319 pins, signal names, electrical functions and connection guidance for each package.
Package view
14Physical pins
LM319N/NOPBPDIP-14
Manufacturer-referencedTexas Instruments
Pin diagram
Select a pin to explore its connection
Highlight
LM319PDIP-14Top view
LM319SOIC-14Top view
Click a lead or use the arrow keys. Top view
PIN 2 · Not connected
No connectionNC
Function
No internal connection for the selected fourteen-pin package.
How to connect
Leave open; do not connect to ground.
PIN 3 · Supply
Output-stage returnGND1
Function
Emitter return for comparator 1 output transistor.
How to connect
Connect to the common 0 V return in this example.
Electrical note
Separate from the analog negative supply pin; observe every rail-to-ground rating.
PIN 4 · Comparator inputs
Non-inverting inputIN1+
Function
Positive input for comparator 1.
How to connect
Apply VIN = 1.50 V.
Electrical note
At a 5 V supply both inputs must remain between 1 V and 3 V.
PIN 5 · Comparator inputs
Inverting inputIN1−
Function
Threshold input for comparator 1.
How to connect
Connect the 2.00 V reference.
Electrical note
Input polarity controls the open-collector state.
PIN 6 · Supply
Negative analog supplyV−
Function
Negative supply for both comparator input/gain paths.
How to connect
Connect to 0 V in the shown single-supply circuit.
Electrical note
In split-supply use this can differ from the output-stage returns.
PIN 7 · Open collectors
Open-collector outputOUT2
Function
Sinks current when IN+ is lower than IN−; releases when IN+ is higher.
How to connect
Leave unused output open in the illustrated circuit.
Electrical note
No internal high-level driver; external pull-up is required to observe HIGH.
PIN 8 · Supply
Output-stage returnGND2
Function
Emitter return for comparator 2 output transistor.
How to connect
Connect to the common 0 V return in this example.
Electrical note
Separate from the analog negative supply pin; observe every rail-to-ground rating.
PIN 9 · Comparator inputs
Non-inverting inputIN2+
Function
Positive input for comparator 2.
How to connect
Tie to the same 1.50 V VIN node.
Electrical note
At a 5 V supply both inputs must remain between 1 V and 3 V.
PIN 10 · Comparator inputs
Inverting inputIN2−
Function
Threshold input for comparator 2.
How to connect
Connect the 2.00 V reference.
Electrical note
Input polarity controls the open-collector state.
PIN 11 · Supply
Positive analog supplyV+
Function
Positive supply shared by both comparators.
How to connect
Connect regulated +5 V and bypass locally with 100 nF to pin 6.
PIN 12 · Open collectors
Open-collector outputOUT1
Function
Sinks current when IN+ is lower than IN−; releases when IN+ is higher.
How to connect
Add a 10 kΩ pull-up to +5 V and a high-impedance meter.
Electrical note
No internal high-level driver; external pull-up is required to observe HIGH.
PIN 13 · Not connected
No connectionNC
Function
No internal connection for the selected fourteen-pin package.
How to connect
Leave open; do not connect to ground.
PIN 14 · Not connected
No connectionNC
Function
No internal connection for the selected fourteen-pin package.
How to connect
Leave open; do not connect to ground.