Manufacturer Part Number

SN74HC21N

Description

Dual 4-input AND gate IC in a 14-pin DIP package. Provides two separate high-speed CMOS logic gates. Designed for general-purpose digital logic operations. Suitable for high-speed and low power consumption applications.

Specifications

Logic type: AND gate

Number of gates: 2

Inputs per gate: 4

Supply voltage: 2V to 6V

Maximum quiescent current: 2 µA

Output current: 5.2 mA High/Low

Input low voltage: 0.5V to 1.8V

Input high voltage: 1.5V to 4.2V

Propagation delay: Max 19ns at 6V, 50pF load

Operating temperature: -40°C to 85°C

Package: 14-pin DIP (PDIP), through-hole mounting

Device Structure

14-pin plastic DIP package

Standard dual in-line layout

Through-hole leads for PCB mounting

Contains two independent 4-input AND gates

Performance Characteristics

Fast switching, low power CMOS logic

TTL-compatible input thresholds

Stable operation up to 6V supply

Reliable performance over full industrial temperature range

Application Environments

Digital logic design

Signal processing

Industrial automation

Home appliances

Consumer electronics

Educational electronic kits

Suitable for designs needing high noise immunity and integration

Selection Guidelines

Choose SN74HC21N for designs needing dual 4-input AND functionality, wide voltage operation, and standard DIP packing

Check supply range compatibility (2V–6V) with your circuit

Use in through-hole PCB designs

Verify output current fits with connected load

Usage Considerations

Observe supply voltage limits to prevent damage

Ensure input voltages meet specified levels for correct logic operation

Account for maximum propagation delay in timing-sensitive designs

Mount securely on PCB for reliable physical and electrical connection

Handle according to standard antistatic precautions

Potential Equivalent/Replacement Models

Direct equivalent: 74HC21N from other manufacturers (e.g., Nexperia, ON Semiconductor, STMicroelectronics)

Surface-mount version: SN74HC21D (SOIC package)

Older TTL version: 74LS21 (smaller supply range, higher power consumption)

If you need help cross-referencing or selecting direct equivalents, contact Ariat-Tech sales team for support.

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