CD74HC147EE4 Texas Instruments Integrated Circuit (Dual-In-Line Packages) In Stock
CD74HC147EE4 is a 9-to-4 line priority encoder in the HC logic family, operating on a 2 V to 6 V supply with 16-pin PDIP package. It accepts up to 9 active-low inputs and outputs a 4-bit binary code for the highest-priority active input, supporting 50 pF load capacitance. RoHS-compliant (e4), available in stock worldwide with fast shipping.
- Manufacturer
- Texas Instruments
- Package
- Dual-In-Line Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- CD74HC147EE4 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 CD74HC147EE4?
- 9-to-4 line priority encoding with active-low inputs for compact binary output in digital systems
- Wide supply voltage range of 2 V to 6 V enables compatibility across 3.3 V and 5 V logic families
- 16-pin PDIP package with 50 pF load capacitance for easy breadboard prototyping and through-hole PCB assembly
- RoHS-compliant (JESD-609 e4) and Pb-free, meeting modern environmental standards
What is CD74HC147EE4 used for?
CD74HC147EE4 is widely used in keyboard encoders and keypad matrix scanning circuits where multiple input lines must be prioritized and reduced to a 4-bit binary code. It suits interrupt priority management in microcontroller systems and industrial control panels where 9 discrete signal lines need efficient encoding. The device also finds application in data entry systems, BCD encoding for display drivers, and analog multiplexer control logic operating from 3.3 V or 5 V rails.
What are the specifications of CD74HC147EE4?
| Pbfree Code | Yes |
| YTEOL | 0 |
| Additional Feature | 9 TO 4 LINE PRIORITY ENCODER |
| Family | HC/UH |
| JESD-30 Code | R-PDIP-T16 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | ENCODER |
| Number of Bits | 9 |
| Number of Functions | 1 |
| Output Polarity | TRUE |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | DIP16,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Packing Method | TUBE |
| Propagation Delay (tpd) | 240ns |
| 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 | NICKEL PALLADIUM GOLD |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| HTS Code | 8542.39.00.60 |
Where can I find the CD74HC147EE4 datasheet?
CD74HC147EE4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for CD74HC147EE4?
Compatible alternatives and drop-in replacements for CD74HC147EE4:
Frequently Asked Questions
What is the supply voltage range for CD74HC147EE4 and how does it affect system integration?
CD74HC147EE4 operates over a supply voltage range of 2 V to 6 V, making it compatible with both 3.3 V and 5 V logic systems. This wide range simplifies integration into mixed-voltage designs without level-shifting hardware. The device maintains TTL-compatible output levels across this range, reducing BOM complexity in industrial and consumer electronics.
How many input lines can CD74HC147EE4 encode and what output format does it produce?
CD74HC147EE4 encodes 9 active-low input lines (I1 through I8 plus an implicit zero) into a 4-bit active-low BCD output. The encoder resolves priority automatically, with I8 having the highest priority. This 9-to-4 encoding reduces wiring complexity in systems with up to 9 discrete signal sources, such as keypad matrices or interrupt lines.
For a prototype keyboard scanner, why might CD74HC147EE4 in 16-pin PDIP be preferred over surface-mount alternatives?
The 16-pin PDIP package allows direct insertion into standard 0.1-inch breadboards and through-hole PCBs, making CD74HC147EE4 ideal for rapid prototyping and lab evaluation without soldering fine-pitch SMD pads. The 50 pF rated load capacitance is well-suited for typical prototype trace lengths. Engineers can swap or test multiple units easily before committing to a surface-mount production layout.
When would CD74HC147EE4 be a suitable lower-cost alternative to a programmable logic device for priority encoding?
For fixed 9-to-4 priority encoding applications needing fewer than 9 inputs, CD74HC147EE4 costs significantly less than a CPLD or FPGA solution while offering deterministic propagation delay and no firmware development overhead. In designs with stable logic requirements and operating voltages of 2 V to 6 V, the single-function encoder provides a simpler, faster time-to-market option with MSL 1 storage classification.
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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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