| Part Number | SN74LS21N | SN74LS21D | 
|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments | 
| Category | Logic - Gates and Inverters | Logic - Gates and Inverters | 
|   |   | |
| Product Status | Active | Active | 
| Logic Type | AND Gate | AND Gate | 
| Number of Circuits | 2 | 2 | 
| Number of Inputs | 4 | 4 | 
| Features | - | - | 
| Voltage - Supply | 4.75V ~ 5.25V | 4.75V ~ 5.25V | 
| Current - Quiescent (Max) | - | - | 
| Current - Output High, Low | 400µA, 8mA | 400µA, 8mA | 
| Logic Level - Low | 0.8V | 0.8V | 
| Logic Level - High | 2V | 2V | 
| Max Propagation Delay @ V, Max CL | 20ns @ 5V, 15pF | 20ns @ 5V, 15pF | 
| Operating Temperature | 0°C ~ 70°C | 0°C ~ 70°C | 
| Mounting Type | Through Hole | Surface Mount | 
| Supplier Device Package | 14-PDIP | 14-SOIC | 
| Package / Case | 14-DIP (0.300", 7.62mm) | 14-SOIC (0.154", 3.90mm Width) |