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SN74HC21 from TEXAS

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SN74HC21

Manufacturer: TEXAS, TI

Dual 4-Input Positive-AND Gates

Partnumber Manufacturer Quantity Availability
SN74HC21 TEXAS, TI 584 In Stock

Description and Introduction

Dual 4-Input Positive-AND Gates The SN74HC21 is a dual 4-input positive-AND gate manufactured by Texas Instruments (TI). Below are its specifications, descriptions, and features based on Ic-phoenix technical data files:

### **Specifications:**
- **Logic Type:** AND Gate  
- **Number of Circuits:** 2  
- **Number of Inputs per Gate:** 4  
- **Supply Voltage Range (VCC):** 2V to 6V  
- **High-Level Output Current (IOH):** -5.2 mA  
- **Low-Level Output Current (IOL):** 5.2 mA  
- **Propagation Delay (tpd):** 13 ns (typical at 5V)  
- **Operating Temperature Range:** -40°C to +85°C  
- **Package Options:** PDIP, SOIC, TSSOP  

### **Description:**
The SN74HC21 is a high-speed CMOS logic device containing two independent 4-input AND gates. It operates over a wide voltage range (2V to 6V) and provides high noise immunity while consuming low power. The device is compatible with standard CMOS and TTL logic levels.

### **Features:**
- **Wide Operating Voltage Range:** 2V to 6V  
- **Low Power Consumption:** Typically 2 µA (static)  
- **High Noise Immunity:** CMOS technology  
- **Balanced Propagation Delays**  
- **Compatible with TTL Inputs**  
- **Schmitt-Trigger Inputs (Not Applicable for SN74HC21)**  

For detailed electrical characteristics and application notes, refer to the official Texas Instruments datasheet.

Application Scenarios & Design Considerations

Dual 4-Input Positive-AND Gates

Alternative Part Number

  • MC74HC21ADG --: Same 74HC21 dual 4-input AND gate function with matching HC CMOS logic family and pinout, widely available from a different manufacturer.
  • CD74HC21E --: Direct functional equivalent dual 4-input AND gate in the 74HC family from the same manufacturer, suitable drop-in replacement.
  • 74HC21D,653 --: Equivalent 74HC21 dual 4-input AND gate in SO package from an alternate supplier, offering comparable speed and drive characteristics.
  • MC74HC21ADR2G --: Direct 74HC21 dual 4-input AND gate equivalent with same logic function and HC speed family, widely available and pin-compatible.

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