LM393 Reference Tables, Pins & Specifications

Pin reference

Signal names, electrical functions and connection guidance

PDIP-8

Physical pin numbers8 pins

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LM393 pin functions and connections
Signal	Type	Function & connection
OUT1	Open-collector output	Channel A sinks current when IN1− is above IN1+. Connection guidance Add a 10 kΩ pull-up to +5 V; read this node with a high-impedance input. The IC does not actively drive HIGH.
IN1−	Inverting input	Channel A reference input in the illustrated circuit. Connection guidance Connect the 2.00 V divider node. Keep both example inputs within 0–3 V at a 5 V supply.
IN1+	Non-inverting input	Channel A measured signal. Connection guidance Connect VIN and a common ground.
GND	Supply return	Ground reference for both comparators. Connection guidance Connect the supply return and bypass capacitor.
IN2+	Non-inverting input	Channel B positive input. Connection guidance Tie to GND when unused in this example.
IN2−	Inverting input	Channel B negative input. Connection guidance Connect to the same 2 V reference to give the unused channel a defined state.
OUT2	Open-collector output	Channel B current-sinking output. Connection guidance Leave unconnected in the single-channel example. Use a separate pull-up when using channel B.
VCC	Positive supply	Shared positive supply for both comparators. Connection guidance Apply +5 V; place 100 nF between pins 8 and 4. Classic LM393 recommended supply: 2–30 V.

Classic LM393 · not the B revision

Manufacturer-referenced values5 parameters

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Parameter	Value	Conditions / notes
Supply	2–30 V	Single supply; example uses 5 V
Ambient temperature	0 to +70°C	LM393 / LM393A grade
Input voltage range	0 to VCC − 2 V	Recommended full-temperature range
Example input range	0–3 V	At VCC = 5 V
Output HIGH	External pull-up required	Output transistor is off

TI SLCS005AH recommended conditions for the classic device.

5 V supply unless stated

Manufacturer-referenced values7 parameters

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Parameter	Value	Conditions / notes
Input offset voltage	2 mV typical; 5 mV maximum	25°C; VCC = 5–30 V
Offset over temperature	9 mV maximum	0–70°C
Input bias current	25 nA typical; 250 nA maximum	Magnitude at 25°C
Output LOW voltage	0.13 V typical; 0.40 V maximum	4 mA sink; VID = −1 V; 25°C
Output LOW over temperature	0.70 V maximum	Same 4 mA test; full range
Total supply current	0.45 mA typical; 1 mA maximum	5 V; unloaded; 25°C
Response time	1.3 µs typical	100 mV step; 5 mV overdrive; 5.1 kΩ pull-up; 15 pF

Response time and typical LOW voltage are not guaranteed operating limits.

Voltage difference and pull-up

Manufacturer-referenced values5 parameters

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Parameter	Value	Conditions / notes
IN+ < IN−	Output transistor ON	LOW; current flows through the pull-up
IN+ > IN−	Output transistor OFF	HIGH only with a pull-up or another defined load
Inputs nearly equal	Offset and noise matter	Output state is not guaranteed at exact equality
No pull-up; transistor OFF	Floating output	Do not call this HIGH
Noisy threshold	May switch repeatedly	Use calculated hysteresis for a stable transition

This example has no positive-feedback hysteresis.

Nominal 5 V example

Manufacturer-referenced values6 parameters

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Divider tolerance, input bias and supply error affect the threshold.

LM393P · PDIP-8

Manufacturer-referenced values6 parameters

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Parameter	Value	Conditions / notes
Lead pitch	2.54 mm	Through-hole; top view
Supply absolute maximum	36 V	Stress rating; recommended maximum is 30 V
Output voltage absolute maximum	−0.3 to +36 V	Observe the load and current limits
Output current absolute maximum	20 mA	Not a recommended design current
Junction temperature limit	150°C	Absolute maximum
Storage temperature	−65 to +150°C	Unpowered storage

Use the manufacturer thermal data for the actual board and package.