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| Part Number | SN74HC21DG4 | SN74HC21DRG4 | SN74HC21NG4 | SN74HC20DG4 | SN74HC21DE4 | 
|---|---|---|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | 
| Product Status | Discontinued at Digi-Key | Obsolete | Discontinued at Digi-Key | Active | Discontinued at Digi-Key | 
| Logic Type | AND Gate | AND Gate | AND Gate | NAND Gate | AND Gate | 
| Number of Circuits | 2 | 2 | 2 | 2 | 2 | 
| Number of Inputs | 4 | 4 | 4 | 4 | 4 | 
| Features | - | - | - | - | - | 
| Voltage - Supply | 2V ~ 6V | 2V ~ 6V | 2V ~ 6V | 2V ~ 6V | 2V ~ 6V | 
| Current - Quiescent (Max) | 2 µA | 2 µA | 2 µA | 2 µA | 2 µA | 
| Current - Output High, Low | 5.2mA, 5.2mA | 5.2mA, 5.2mA | 5.2mA, 5.2mA | 5.2mA, 5.2mA | 5.2mA, 5.2mA | 
| Logic Level - Low | 0.5V ~ 1.8V | 0.5V ~ 1.8V | 0.5V ~ 1.8V | 0.5V ~ 1.8V | 0.5V ~ 1.8V | 
| Logic Level - High | 1.5V ~ 4.2V | 1.5V ~ 4.2V | 1.5V ~ 4.2V | 1.5V ~ 4.2V | 1.5V ~ 4.2V | 
| Max Propagation Delay @ V, Max CL | 19ns @ 6V, 50pF | 19ns @ 6V, 50pF | 19ns @ 6V, 50pF | 19ns @ 6V, 50pF | 19ns @ 6V, 50pF | 
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | 
| Mounting Type | Surface Mount | Surface Mount | Through Hole | Surface Mount | Surface Mount | 
| Supplier Device Package | 14-SOIC | 14-SOIC | 14-PDIP | 14-SOIC | 14-SOIC | 
| Package / Case | 14-SOIC (0.154", 3.90mm Width) | 14-SOIC (0.154", 3.90mm Width) | 14-DIP (0.300", 7.62mm) | 14-SOIC (0.154", 3.90mm Width) | 14-SOIC (0.154", 3.90mm Width) |