SN54HC148J Texas Instruments Integrated Circuit (Ceramic Dual-In-Line Packages) In Stock
The SN54HC148J is an 8-line to 3-line priority encoder in the HC/UH CMOS logic family, housed in a 16-pin ceramic DIP package. It encodes the highest-priority active-low input among 8 lines into a 3-bit binary output, with cascadable group select outputs for expanding to larger encoding applications. Rated for military temperature range -55°C to +125°C, it suits aerospace and defense systems.
- Manufacturer
- Texas Instruments
- Package
- Ceramic Dual-In-Line Packages
- Pin Count
- 16
- Lifecycle
- ACTIVE
- Datasheet
- SN54HC148J Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -55.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of SN54HC148J?
- 8-to-3 line priority encoder with active-low inputs and outputs
- Cascadable design with group select (GS) output for multi-device expansion
- Military temperature range: -55°C to +125°C
- HC CMOS family: 2 V to 6 V supply voltage compatibility
- 16-pin ceramic DIP package for high-reliability through-hole assembly
- Enable input (EI) for chip-select and cascading control
- Propagation delay typically 21 ns at 5 V, 50 pF load
What is SN54HC148J used for?
The SN54HC148J is used in aerospace avionics computers, military ground systems, and space-qualified electronics requiring a robust 8-to-3 priority encoder that operates across the full -55°C to +125°C military temperature range. It is applied in interrupt priority arbitration circuits for microcontroller systems where multiple peripherals share a single interrupt line, encoding the highest-priority request into a 3-bit vector for the CPU. Keyboard and keypad scanner circuits, as well as industrial safety systems with multiple discrete input lines, also use this device for compact input prioritization.
What are the specifications of SN54HC148J?
| Pbfree Code | Yes |
| YTEOL | 15 |
| Additional Feature | 8 TO 3 LINE PRIORITY ENCODER; CASCADABLE; WITH GROUP SELECT OUTPUT |
| Family | HC/UH |
| JESD-30 Code | R-GDIP-T16 |
| JESD-609 Code | e0 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | ENCODER |
| Max I(ol) | 0.0052A |
| Number of Bits | 8 |
| Number of Functions | 1 |
| Output Polarity | INVERTED |
| Package Body Material | CERAMIC, GLASS-SEALED |
| Package Equivalence Code | DIP16,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Packing Method | TUBE |
| Power Supply Current-Max (ICC) | 0.16mA |
| Prop. Delay@Nom-Sup | 49ns |
| Propagation Delay (tpd) | 285ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 6V |
| Supply Voltage-Min (Vsup) | 2V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | NO |
| Technology | CMOS |
| Temperature Grade | MILITARY |
| Terminal Finish | Tin/Lead (Sn/Pb) |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Package | Ceramic Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.90 |
Where can I find the SN54HC148J datasheet?
SN54HC148J Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SN54HC148J?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How does the SN54HC148J determine priority when multiple inputs are active simultaneously?
The SN54HC148J assigns highest priority to the highest-numbered input line; when input I7 is asserted low simultaneously with any other input, the output encodes binary 111 regardless of other active inputs. This hardware-wired priority scheme resolves contention among up to 8 active-low inputs in a single propagation delay of approximately 21 ns at 5 V supply and 50 pF load, making it suitable for fast interrupt arbitration circuits.
Can multiple SN54HC148J devices be cascaded to encode more than 8 input lines?
Yes, the SN54HC148J includes an enable input (EI) and group select output (GS) specifically designed for cascading. Two devices can be connected to encode 16 lines into 4 bits by connecting the GS output of the high-priority device to the EI input of the lower-priority device, with the 3-bit outputs ORed together. This cascade architecture extends priority encoding to 24, 32, or more input lines by adding additional stages.
What temperature range does SN54HC148J support and which applications require this rating?
The SN54HC148J is rated for the full military temperature range of -55°C to +125°C, which meets MIL-STD requirements for airborne, shipboard, and space electronics exposed to extreme environmental conditions. Commercial equivalents such as SN74HC148 are only rated to 85°C, making SN54HC148J the required choice for engine control electronics, satellite subsystems, and defense communication systems that must function reliably across severe thermal cycles.
What supply voltage range does SN54HC148J operate at, and is it compatible with 3.3 V logic?
The SN54HC148J operates from 2 V to 6 V supply voltage, with guaranteed AC and DC characteristics typically specified at 2 V, 4.5 V, and 6 V. At 3.3 V supply, the device functions correctly but input high voltage thresholds and output drive current differ from 5 V operation; designers should verify that upstream 3.3 V logic outputs meet the VIH minimum of approximately 2.31 V (0.7 × VCC) to ensure reliable recognition of high-level inputs.
How does the SN54HC148J differ from the SN54LS148 for legacy military board replacements?
Compared to the bipolar SN54LS148, the SN54HC148J consumes significantly less quiescent power—typically under 80 µA versus several milliamps for LSTTL—making it preferable in battery-backed or power-budget-sensitive military systems. The HC device also offers rail-to-rail output swing and higher noise margins at 3.3 V to 5 V supply, while the LS version provides slightly faster propagation delay of around 15 ns. Pin-for-pin compatibility allows direct substitution in most designs after verifying drive current compatibility with connected loads.
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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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