SN74HC148NS Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
Texas Instruments SN74HC148NS is an 8-line to 3-line priority encoder in the HC CMOS logic family, operating from -40°C to 85°C over a 2 V to 6 V supply range. Available in a 16-pin SOIC package for compact digital priority encoding applications.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 16
- Lifecycle
- ACTIVE
- Datasheet
- SN74HC148NS Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of SN74HC148NS?
- 8-to-3 priority encoder resolving multiple simultaneous active inputs to the highest-priority 3-bit binary code
- HC CMOS logic family with 2 V to 6 V supply range and TTL-compatible inputs for mixed-voltage designs
- -40°C to 85°C industrial temperature range for reliable operation in harsh embedded environments
- 16-pin SOIC package enabling easy PCB assembly with standard reflow soldering processes
What is SN74HC148NS used for?
The SN74HC148NS is used in interrupt prioritization circuits for microcontrollers, where multiple peripheral interrupt lines must be encoded into a 3-bit vector for fast IRQ dispatch. It is also applied in keyboard scanning matrices, mechanical switch arbitration, and multiplexed sensor input systems where the highest-priority active input must be identified with minimal propagation delay.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Where can I find the SN74HC148NS datasheet?
SN74HC148NS Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SN74HC148NS?
Compatible alternatives and drop-in replacements for SN74HC148NS:
Frequently Asked Questions
How many input lines does the SN74HC148NS support, and how does it resolve simultaneous active inputs?
The SN74HC148NS accepts 8 active-low input lines and encodes them to a 3-bit active-low binary output. When multiple inputs are asserted simultaneously, the device outputs the binary code corresponding to the highest-priority (numerically highest) active input, allowing a microcontroller to service the most critical pending event first.
What supply voltage and temperature range does the SN74HC148NS support for industrial designs?
The SN74HC148NS operates from a 2 V to 6 V supply and is specified over a -40°C to 85°C industrial temperature range. This makes it compatible with both 3.3 V and 5 V logic systems in industrial controllers, PLCs, and embedded computing boards that must function reliably across wide ambient temperature variations.
How can multiple SN74HC148NS devices be cascaded to encode more than 8 input lines?
The SN74HC148NS includes enable input (EI) and group select output (GS) pins specifically for cascading. By connecting the GS output of a lower-priority device to the EI input of a higher-priority device, designers can extend the priority encoder to 16, 24, or more inputs using 2, 3, or more ICs, with typical propagation delays of approximately 20 ns per stage at 5 V.
In an interrupt controller design, how does SN74HC148NS reduce the microcontroller's IRQ handling overhead?
By encoding 8 interrupt lines to a 3-bit binary address in hardware, the SN74HC148NS eliminates the need for the microcontroller to poll each interrupt line individually. The 3-bit output can directly index a 8-entry interrupt vector table, reducing IRQ dispatch latency from O(8) polling steps to a single table lookup — a significant throughput improvement in time-critical real-time systems.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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