LM311 Differential Voltage Comparator IC SOP-8

LM311 Differential Voltage Comparator IC SOP-8 is a high-speed, precision device that engineers and electronics enthusiasts rely on for a variety of signal processing tasks. This integrated circuit compares two input voltages and provides a digital output, making it perfect for converting analog signals to digital logic. Its key advantage lies in its wide operating voltage range, low input bias current, and an open-collector output, which allows it to interface with a wide range of logic families and load types. Housed in a compact SOP-8 package, it is ideal for modern, space-constrained PCB designs.

Key Features:

• Wide Operating Voltage: Works with a single supply from 5 V to 30 V, or with dual supplies from ±5 V to ±15 V.
• Low Input Bias Current: Minimizes the load on your input signal source, ensuring precise and accurate comparisons.
• Open-Collector Output: You can interface the output directly with TTL, MOS, or DTL logic, and even drive relays, LEDs, or other loads up to 50 mA.
• High Speed: Offers a quick response time of approximately 165 ns, suitable for high-frequency applications.
• Strobe Capability: A strobe function allows you to disable the output and turn it off, adding another layer of control.
• Differential Inputs: Precisely compares the voltage difference between the inverting and non-inverting inputs.

Technical Specifications:

• Operating Voltage: Single: 5 V to 30 V; Dual: ±5 V to ±15 V
• Input Offset Voltage: 3.0 mV (typical)
• Input Bias Current: 100 nA (typical)
• Response Time: 165 ns
• Output Sink Current: 50 mA (max)
• Operating Temperature: 0 °C to +70 °C

Mechanical Specifications:

• Package Type: Small Outline Package (SOP-8)
• Assembly: Designed for surface-mount soldering
• Pin Count: 8 pins
• Material: Plastic IC casing

Dimensions:

• Body Length: ~4.9 mm
• Body Width: ~3.9 mm
• Pin Pitch: ~1.27 mm
• Height: ~1.5 mm

Pinout and Wiring:

• PIN 1: Balance/Strobe (not always used)
• PIN 2: Inverting Input (-)
• PIN 3: Non-inverting Input (+)
• PIN 4: V- (Negative Supply)
• PIN 5: N/C (No Connection)
• PIN 6: Output
• PIN 7: V+ (Positive Supply)
• PIN 8: Ground
• Wiring Note: Connect your input signals to PINs 2 and 3. Power the IC with V+ and V- (or V+ and Ground for a single supply). The output at PIN 6 will pull low when the voltage at PIN 2 is higher than PIN 3.

Datasheet Reference:

• For complete technical details, reference the official Texas Instruments LM311 datasheet, which provides comprehensive electrical specifications, performance characteristics, and typical application circuits.

Applications:

• Zero-Crossing Detectors: Identify when an AC signal crosses the 0V threshold.
• Level Shifters: Convert signals from one voltage level to another.
• Voltage Sensing: Detect when a voltage rises above or falls below a set threshold.
• Oscillators: Build simple relaxation oscillators and timing circuits.
• Window Comparators: Check if a voltage is within a specific range.

Equivalent Models:

• LM339: A quad-comparator IC that packs four independent comparators into a single package.
• LM393: A dual-comparator IC, offering two independent comparators.
• LM2903: A dual-comparator IC with an extended temperature range.

Package Includes:

• 1 x LM311 Differential Voltage Comparator IC SOP-8