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Texas Instruments CD74HC147PWR
- Part No.:
- CD74HC147PWR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
CD74HC147PWR.pdf
- Description:
- IC PRIORITY ENCOD 1X10:4 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,791
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Product details
Overview
CD74HC147PWR from Texas Instruments is a high-speed CMOS 9-input priority encoder that implements 10-line-to-4-line active-low encoding with decimal zero implied. It operates from 2V to 6V, delivers 13ns typical propagation delay at 5V/15pF, and supports industrial temperature range (–55°C to 125°C). It is used in keyboard encoders, interrupt prioritization circuits, and digital control panels where input conflict resolution is required.
For engineers reviewing the CD74HC147PWR datasheet, CD74HC147PWR pinout, CD74HC147PWR application, or CD74HC147PWR equivalent, this page provides verified functional identity, TSSOP-16 package mapping, truth-table-validated priority logic behavior, supply-voltage-dependent noise immunity specs, and direct LSTTL-compatible alternatives for legacy system upgrades.
Technical Context
The CD74HC147PWR implements a fixed-priority, active-low 9-input (I0–I9) to 4-output (Y0–Y3) encoder with I9 assigned highest priority. Encoding follows standard priority logic: only the highest-numbered asserted input determines output state, and all outputs go HIGH when all inputs are HIGH (encoding "zero").
It uses silicon-gate CMOS technology with buffered inputs/outputs, balanced rise/fall times, and fanout capability of 15 LSTTL loads. Its electrical interface supports both CMOS-level and TTL-level input compatibility depending on VCC, and it exhibits low quiescent current (≤160 µA over full temperature range).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | High-speed CMOS (HC), pin-compatible with LSTTL |
| Supply Voltage Range | 2V to 6V - enables single-supply operation across 3.3V and 5V systems |
| Propagation Delay | 13ns typical at VCC = 5V, CL = 15pF - ensures timing predictability in synchronous control paths |
| Operating Temperature | –55°C to +125°C - qualified for automotive under-hood and industrial motor-control environments |
| Input Logic Levels | VIH = 3.15V min, VIL = 1.35V max at 4.5V - guarantees robust noise margin (30% of VCC) |
| Output Drive | ±25mA per pin - sufficient to directly drive LED indicators or small logic loads without buffers |
| Quiescent Current | ≤160µA max over full temp range - supports low-power standby modes in battery-backed systems |
Pinout & Package
TSSOP-16 package (PW), 5.00mm × 4.40mm body size, 1.2mm max height, lead pitch 0.65mm, RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (I4) | Active-low input | Input line 4; LOW assertion contributes to encoded output only if higher-priority inputs (I5–I9) are all HIGH |
| 2 (I5) | Active-low input | Input line 5; second-highest priority among lower group; affects Y2/Y1/Y0 when I6–I9 inactive |
| 6 (Y2) | Active-low output | MSB of 4-bit binary output; LOW when encoded value ≥4 (e.g., I4 or higher asserted) |
| 7 (Y1) | Active-low output | Second-bit output; LOW for encoded values 2,3,6,7 - used with Y2/Y0/Y3 to reconstruct priority code |
| 8 (GND) | Power reference | Analog/digital ground return; must be low-impedance path to minimize switching noise coupling |
| 9 (I0) | Active-low input | Lowest-priority input; only affects output when I1–I9 all HIGH - encodes "zero" condition |
| 10 (I9) | Active-low input | Highest-priority input; assertion forces Y3–Y0 = LHLH (binary 9), overriding all other inputs |
| 14 (Y3) | Active-low output | LSB of 4-bit output; LOW for odd-encoded values (1,3,5,7,9) - critical for parity-sensitive decoding |
| 15 (NC) | No connection | Internally unconnected; must remain floating - no PCB trace or pull-up/down allowed |
| 16 (VCC) | Positive supply | Primary power rail; requires local 0.1µF ceramic bypass capacitor placed within 3mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| Priority encoding logic | Fixed hardware implementation resolves multiple simultaneous inputs deterministically - eliminates software polling latency in real-time interrupt controllers |
| Wide VCC range (2–6V) | Enables drop-in replacement in both 3.3V microcontroller interfaces and legacy 5V TTL systems without level-shifting |
| Buffered I/O structure | Reduces capacitive loading sensitivity and improves signal integrity on long PCB traces driving multiple downstream gates |
| High noise immunity (30% VCC) | Guarantees reliable operation in electrically noisy industrial cabinets with variable EMI exposure |
| Low power consumption | Reduces thermal load in dense logic arrays - quiescent ICC ≤80µA at 25°C supports fanless embedded designs |
Applications
| Keyboard Interface Module | Industrial PLC Input Prioritizer |
|---|---|
Use Scenario: Matrix keypad scanning in HVAC control panels where multiple keypresses may occur simultaneously. IC Role / Device Role / Timing Role: Priority encoder resolves overlapping key closures into unique 4-bit codes sent to MCU via parallel bus. Use Value: Eliminates need for firmware debouncing and arbitration logic - reduces MCU ISR execution time by >40% versus software-based priority handling. |
Use Scenario: Emergency stop chain monitoring in CNC machine tool control cabinets with 9 discrete safety sensors. IC Role / Device Role / Timing Role: Hardware-level priority resolution maps highest-asserted fault signal to dedicated interrupt vector before software response. Use Value: Guarantees sub-20ns fault-to-interrupt latency - meets SIL-2 response timing requirements for Category 3 safety functions. |
| Legacy System Upgrade Adapter | Digital Panel Meter Selector |
Use Scenario: Retrofitting obsolete 74LS147 encoders in military test equipment requiring extended temperature support. IC Role / Device Role / Timing Role: Pin-compatible CMOS replacement delivering identical truth table behavior with improved supply tolerance. Use Value: Enables continued production without PCB redesign - maintains backward compatibility while extending operating life to –55°C. |
Use Scenario: Multi-range digital voltmeter front-end selecting between 9 analog input channels based on user rotary switch position. IC Role / Device Role / Timing Role: Converts mechanical switch position (active-low encoded) into binary address for ADC channel selection logic. Use Value: Provides deterministic channel addressing even during switch bounce - prevents erroneous range selection during manual adjustment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar priority encoder applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC147N | Same HC logic family, identical truth table, but in PDIP-16 package (19.31mm × 6.35mm) | Requires through-hole PCB layout; lacks surface-mount compatibility and thermal performance of TSSOP | Select for prototyping or legacy through-hole assemblies where reflow compatibility is not required |
| CD74HCT147PWR | HCT variant: 4.5–5.5V only, TTL-compatible inputs (VIL ≤ 0.8V), same TSSOP-16 footprint | Better interoperability with 5V LSTTL peripherals but incompatible with 3.3V-only systems | Select when interfacing directly with legacy 74LS-series logic without level shifters |
Compared with SN74HC147N, CD74HC147PWR offers superior thermal dissipation (RθJA = 137.5°C/W vs. 67°C/W) and board-space efficiency; compared with CD74HCT147PWR, it provides broader supply flexibility (2–6V) at the cost of reduced TTL input compatibility.
Availability
CD74HC147PWR is available at Aetrix Electronics and suitable for industrial control panels, test instrumentation, and aerospace avionics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74HC147PWR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions with over 50 years of high-reliability component development.
The CD74HC147PWR belongs to TI's legacy HC logic family, designed for pin-compatible upgrades of 74LS devices in industrial, automotive, and defense systems demanding wide temperature operation and low power.
FAQ
What is the function of the NC pin on CD74HC147PWR?
The NC (No Connection) pin on CD74HC147PWR is pin 15 and has no internal connection to the die. It must remain unconnected on the PCB - no trace, pull-up, pull-down, or grounding is permitted. This pin exists solely for mechanical symmetry in the TSSOP-16 package and does not affect device functionality or timing behavior of the CD74HC147PWR.
Can CD74HC147PWR operate reliably at 3.3V supply voltage?
Yes, CD74HC147PWR is fully specified for operation from 2V to 6V, including 3.3V nominal systems. At VCC = 3.3V, VIH = 2.31V (min) and VIL = 0.99V (max) provide 30% noise margin, and propagation delay remains within datasheet limits (tPLH/tPHL ≤ 48ns at –40°C to +85°C). The CD74HC147PWR maintains full functionality without derating at 3.3V.
How does CD74HC147PWR handle simultaneous active inputs?
CD74HC147PWR implements strict hardware priority: when multiple inputs are LOW, only the highest-numbered asserted input determines the output code (I9 > I8 > … > I0). For example, if I3 and I7 are both LOW, the output reflects I7 only. This deterministic behavior is hardwired and requires no clock or configuration - a core functional guarantee of the CD74HC147PWR.
Is CD74HC147PWR compatible with 5V TTL logic inputs?
No - CD74HC147PWR is an HC-type device with CMOS input thresholds (VIL = 1.35V max at 4.5V), not TTL-compatible levels. For direct interface with 5V TTL outputs, use CD74HCT147PWR instead, which specifies VIL ≤ 0.8V and VIH ≥ 2.0V. Interfacing CD74HC147PWR with TTL may cause unreliable recognition of LOW states due to insufficient noise margin.
What is the recommended bypass capacitor for CD74HC147PWR?
Texas Instruments specifies a 0.1µF ceramic capacitor placed as close as possible to the VCC pin (pin 16) of CD74HC147PWR, with short, low-inductance traces to GND (pin 8). This minimizes supply rail disturbance during output transitions. For enhanced high-frequency noise suppression, a parallel 1µF capacitor is acceptable - but the 0.1µF unit is mandatory for stable operation of the CD74HC147PWR.
CD74HC147PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Priority Encoder
- Circuit:
- 1 x 10:4
- Independent Circuits:
- 1
- Current - Output High, Low:
- 5.2mA, 5.2mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
CD74HC147PWR FAQ
1.How can I place an order for CD74HC147PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HC147PWR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for CD74HC147PWR reliable?
The price and inventory of CD74HC147PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HC147PWR is usually 5 days.
3.What payment methods are accepted for CD74HC147PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HC147PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HC147PWR?
CD74HC147PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HC147PWR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for CD74HC147PWR?
For technical support, including CD74HC147PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HC147PWR requirements.
6.How does Aetrix verify that CD74HC147PWR is sourced from the original manufacturer or authorized distributors?
All CD74HC147PWR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that CD74HC147PWR meets industry standards.
7.What is the process for return or replacement of CD74HC147PWR?
All CD74HC147PWR units undergo pre-shipment inspection (PSI). If there is an issue with CD74HC147PWR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The CD74HC147PWR part is unused and in its original packaging.
Return procedure for CD74HC147PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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