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Product Detailed Parameters
- Description：IC PRIORITY ENCOD 1 X 8:3 16SOIC
- Series：74HC
- Mfr：Texas Instruments
- Package：Tube
- Type：Priority Encoder
- Circuit：1 x 8:3
- Independent Circuits：1
- Current - Output High, Low：5.2mA, 5.2mA
- Voltage Supply Source：Single Supply
- Voltage - Supply：2V ~ 6V
- Operating Temperature：-40°C ~ 85°C
- Mounting Type：Surface Mount
- Package / Case：16-SOIC (0.154", 3.90mm Width)
- Supplier Device Package：16-SOIC
- Grade：-
- Qualification：-
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Overview
The SN74HC148D is an 8-line to 3-line priority encoder manufactured by Texas Instruments. It encodes eight data lines into a 3-line binary (octal) code with active-low inputs and outputs. The device operates within a supply voltage range of 2V to 6V and features low power consumption, with a maximum ICC of 80μA. It provides ±4mA output drive at 5V and typical propagation delay of 16ns. Packaged in a 16-pin SOIC format measuring 9.90 mm × 3.90 mm, it supports cascading via EI and EO signals.
Feature Summary
- Encodes eight data lines to 3-line binary octal code
- Active-low inputs and outputs for priority decoding
- Cascading capability through enable input and output signals
Applications
- N-bit encoding systems
- Code converters and generators
Procurement Notes
Verify the specific package suffix 'D' corresponds to the SOIC-16 form factor required for your PCB layout. Confirm RoHS compliance status and lead finish details against the latest TI orderable addendum. Ensure operating temperature range requirements align with the -40°C to +85°C specification for the SN74HC148D variant.
Selection Notes
Select this component when an 8-input priority encoder with HC logic speed and CMOS power efficiency is needed. It is suitable for designs requiring direct interfacing with LSTTL loads due to its drive capabilities. Consider the SOIC package dimensions for space-constrained applications compared to PDIP or other available packages.
Part Context
This part belongs to the SNx4HC148 family of 8-line to 3-line priority encoders. It is a standard catalog product from Texas Instruments, distinct from the military-grade SN54HC148 variant. The 'D' suffix specifically denotes the SOIC package option within the broader HC logic series designed for general-purpose digital applications.
Replacement Considerations
SN74HC148DR
FAQ
How does the SN74HC148D handle multiple active inputs?
It performs priority decoding, ensuring that only the highest-order active data line is encoded into the 3-line binary output.
Can multiple SN74HC148D units be connected together?
Yes, cascading is supported without external circuitry using the dedicated Enable Input (EI) and Enable Output (EO) signals.
