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| PartNumber | SN74ALS638A-1NSR | SN74ALS638A-1N | SN74ALS638A-1NS |
| Description | Bus Transceivers OCTAL BUS TRANSCEIVER | Bus Transceivers OCTAL BUS TRANSCEIVER | |
| Manufacturer | Texas Instruments | Texas Instruments | Texas Instruments |
| Product Category | Bus Transceivers | Bus Transceivers | Logic - Buffers, Drivers, Receivers, Transceivers |
| RoHS | Y | Y | - |
| Logic Family | ALS | ALS | - |
| Input Level | TTL | TTL | - |
| Output Level | TTL | TTL | - |
| Output Type | 3-State | 3-State | - |
| High Level Output Current | - 15 mA | - 15 mA | - |
| Low Level Output Current | 48 mA | 48 mA | - |
| Propagation Delay Time | 30 ns | 30 ns | - |
| Supply Voltage Max | 5.25 V | 5.25 V | - |
| Supply Voltage Min | 4.75 V | 4.75 V | - |
| Minimum Operating Temperature | 0 C | 0 C | - |
| Maximum Operating Temperature | + 70 C | + 70 C | - |
| Package / Case | SO-20 | PDIP-20 | - |
| Packaging | Reel | Tube | Tape & Reel (TR) |
| Function | Bus Transceiver | Bus Transceiver | - |
| Height | 1.95 mm | 4.57 mm | - |
| Length | 12.6 mm | 24.33 mm | - |
| Number of Circuits | 8 | 8 | - |
| Operating Temperature Range | 0 C to + 70 C | 0 C to + 70 C | - |
| Product | Standard Transceiver | Standard Transceiver | - |
| Series | SN74ALS638A-1 | SN74ALS638A-1 | 74ALS |
| Technology | Bipolar | Bipolar | - |
| Width | 5.3 mm | 6.35 mm | - |
| Brand | Texas Instruments | Texas Instruments | - |
| Mounting Style | SMD/SMT | Through Hole | - |
| Number of Channels | 8 | 8 | - |
| Operating Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | - |
| Polarity | Inverting | Inverting | - |
| Product Type | Bus Transceivers | Bus Transceivers | - |
| Factory Pack Quantity | 2000 | 20 | - |
| Subcategory | Logic ICs | Logic ICs | - |
| Unit Weight | 0.009408 oz | 0.042297 oz | - |
| Package Case | - | - | 20-SOIC (0.209", 5.30mm Width) |
| Operating Temperature | - | - | 0°C ~ 70°C |
| Mounting Type | - | - | Surface Mount |
| Voltage Supply | - | - | 4.5 V ~ 5.5 V |
| Supplier Device Package | - | - | 20-SO |
| Number of Elements | - | - | 1 |
| Current Output High Low | - | - | 15mA, 24mA |
| Logic Type | - | - | Transceiver, Inverting |
| Number of Bits per Element | - | - | 8 |