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Renesas 74HC251P-E
- Part No.:
- 74HC251P-E
- Manufacturer:
- Renesas
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- -
- Datasheet:
-
74HC251P-E.pdf
- Description:
- 74HC251 8-INPUT MULTIPLEXER WITH
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
74HC251P-E from Renesas Electronics is an 8-input digital multiplexer with complementary true (Y) and inverted (W) outputs, 3-state enable control via active-low strobe (S), and DIP-16 packaging. It operates across 2–6 V supply, delivers 20 ns typical propagation delay (A/B/C to Y, CL = 50 pF), supports fanout of 10 LSTTL loads, and draws ≤4 µA static supply current. It is used in address/data routing logic for microcontroller peripheral interfaces and digital signal selection in industrial control panels.
For engineers reviewing the 74HC251P-E datasheet, 74HC251P-E pinout, 74HC251P-E application, or 74HC251P-E equivalent, key selection criteria include its dual-output architecture, 3-state output control timing (tZH/tHZ ≤33 ns at VCC = 6 V), wide voltage range compatibility, low input current (≤1 µA), and DIP-16 mechanical footprint for through-hole prototyping and legacy board replacement.
Technical Context
The 74HC251P-E implements a single 8:1 data selector using high-speed CMOS logic with independent true and complement outputs. Its strobe input (S) enables or disables both outputs simultaneously into high-impedance state, decoupling downstream logic without external gating.
Address decoding is performed by three select inputs (A, B, C) that route one of eight data inputs (D0–D7) to Y and W. All inputs tolerate 0–VCC voltage levels, and outputs drive ±25 mA while maintaining VOH ≥4.4 V and VOL ≤0.26 V at VCC = 4.5 V and IOL/IOH = 4 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0–6.0 V - Enables direct interface with 3.3 V and 5 V logic families without level shifters. |
| Propagation Delay (A/B/C → Y) | 20 ns typ (CL = 50 pF, VCC = 4.5 V) - Supports reliable operation up to ~25 MHz clocked control paths. |
| Output Drive Capability | Fanout of 10 LSTTL loads - Sufficient to drive multiple TTL inputs without buffering in mixed-logic systems. |
| Quiescent Supply Current | ≤4 µA max (Ta = 25°C) - Enables use in low-power standby modes without significant current draw. |
| Input Voltage Thresholds | VIH = 3.15 V min, VIL = 1.35 V max (VCC = 4.5 V) - Provides robust noise margin (>1.3 V) against ground bounce or crosstalk. |
| 3-State Enable Timing | tZH/tHZ = 33 ns max (VCC = 6 V) - Ensures clean bus arbitration with minimal contention window during output enable/disable transitions. |
Pinout & Package
DIP-16 package (PRDP0016AE-B / DP-16FV), 19.2 mm × 6.3 mm body, 2.54 mm pitch, through-hole mounting, Ni/Pd/Au-plated leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | D2 | Data input channel 2 - Selected when A=0, B=1, C=0 per function table. |
| 2 | D1 | Data input channel 1 - Selected when A=0, B=0, C=1. |
| 3 | D0 | Data input channel 0 - Selected when A=0, B=0, C=0; often used as default or reset path. |
| 4 | Y | True output - Active-high replica of selected Dn; drives downstream logic directly. |
| 5 | W | Inverted output - Active-low complement of selected Dn; eliminates need for external inverter. |
| 6 | S (Strobe) | Active-low 3-state enable - Drives both Y and W into high-Z when high; critical for bus sharing. |
| 7 | GND | Ground reference - Must be low-impedance connection to minimize switching noise coupling. |
| 8 | VCC | Positive supply - Decoupling capacitor (0.1 µF ceramic) required within 10 mm for stable operation. |
| 9 | D4 | Data input channel 4 - Selected when A=1, B=0, C=0; supports octal addressing schemes. |
| 10 | D5 | Data input channel 5 - Selected when A=1, B=0, C=1. |
| 11 | D6 | Data input channel 6 - Selected when A=1, B=1, C=0. |
| 12 | D7 | Data input channel 7 - Highest-priority input; selected when A=1, B=1, C=1. |
| 13 | A | LSB address select - Controls bit-0 of 3-bit binary select code (CBA). |
| 14 | B | Mid-bit address select - Controls bit-1 of select code. |
| 15 | C | MSB address select - Controls bit-2 of select code; determines upper/lower half of input set. |
| 16 | D3 | Data input channel 3 - Selected when A=0, B=1, C=1. |
Key Features
| Feature | Design Value |
|---|---|
| Dual true/complement outputs (Y/W) | Eliminates need for external inverters in differential signaling or latch-enable logic paths. |
| Active-low 3-state strobe (S) | Enables direct connection to shared data buses without additional bus transceivers or isolation logic. |
| Wide 2–6 V supply range | Supports interoperability across 3.3 V microcontrollers and 5 V legacy peripherals in hybrid systems. |
| Low input current (≤1 µA) | Minimizes loading on upstream drivers, preserving signal integrity in fanout-heavy control trees. |
| High noise immunity (VIH/VIL margins) | Ensures reliable operation in electrically noisy industrial environments with >1.3 V DC noise margin at 4.5 V. |
Applications
| Industrial PLC I/O Expansion | Microcontroller Address/Data Multiplexing |
|---|---|
Use Scenario: Routing sensor analog-to-digital converter outputs to a single ADC input under programmable control in a modular I/O rack. IC Role / Device Role / Timing Role: Data selector enabling time-division sampling of 8 temperature or pressure sensors using 3 GPIO pins for address control. Use Value: Reduces component count by replacing discrete analog switches and eliminates software-controlled analog mux sequencing delays. |
Use Scenario: Sharing a single 8-bit data bus between multiple peripheral devices (e.g., EEPROM, LCD controller, keypad scanner) on an 8051-based system. IC Role / Device Role / Timing Role: Bus arbitration device controlled by port pins; Y output connects to data bus, S synchronized with WR/RD strobes. Use Value: Enables hardware-selectable peripheral access without requiring dedicated address decoding PLD or FPGA resources. |
| Legacy Test Equipment Signal Routing | Digital Logic Training Boards |
Use Scenario: Switching between calibration reference voltages, DUT outputs, and internal test patterns inside automated bench instruments. IC Role / Device Role / Timing Role: Precision signal path selector with simultaneous true/inverted outputs for differential measurement setups. Use Value: Maintains signal polarity options without adding propagation delay from external inverters, preserving timing-critical test accuracy. |
Use Scenario: Teaching combinational logic design in university labs using breadboarded circuits with manual switch inputs. IC Role / Device Role / Timing Role: Core demonstration IC for multiplexer truth tables, enabling hands-on verification of select logic and output behavior. Use Value: DIP-16 package allows direct insertion into educational breadboards; dual outputs visually reinforce Boolean complement relationships. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8:1 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC251N | Same logic function and pinout; TI version rated for –40°C to +85°C, identical VCC range and timing specs. | No functional deviation; validated for same industrial control and educational use cases. | Select when sourcing from TI-authorized channels or requiring TI-specific qualification documentation. |
| CD74HC251E | Identical electrical specs and pinout; Harris/Intersil version with same 2–6 V operation and 20 ns tpd. | Compatible in all 74HC251P-E designs; minor package marking variation only. | Choose for multi-source procurement strategy where Renesas supply constraints exist. |
Compared with 74HC251P-E, SN74HC251N and CD74HC251E provide identical 8:1 multiplexing functionality, pin-compatible DIP-16 footprints, and matching 3-state timing-making them drop-in alternatives for continuity in production and education platforms without layout or firmware changes.
Availability
74HC251P-E is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, microcontroller bus arbitration, and educational digital logic training requiring stable component supply and long-term DIP-16 availability.
Supply support for 74HC251P-E 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
Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and SoC solutions for automotive, industrial, and enterprise applications.
The 74HC251P-E belongs to Renesas' legacy HC logic family, designed for pin-compatible replacement of TTL devices in industrial control, instrumentation, and educational hardware where reliability, wide voltage operation, and through-hole assembly are required.
FAQ
What is the maximum operating frequency supported by the 74HC251P-E?
The 74HC251P-E does not specify a maximum clock frequency, but its propagation delay (20 ns typical from address to Y output at VCC = 4.5 V, CL = 50 pF) implies reliable operation up to approximately 25 MHz in well-terminated, low-capacitance control paths. System-level timing must account for worst-case delays (51 ns max), PCB trace inductance, and load capacitance beyond 50 pF.
Does the 74HC251P-E support 3.3 V logic systems?
Yes, the 74HC251P-E supports 3.3 V operation: its VCC range is 2.0–6.0 V, and VIH is guaranteed ≥1.8 V at VCC = 3.3 V (interpolated from datasheet VCC = 2.0 V and 4.5 V specs). It interfaces cleanly with 3.3 V microcontrollers when driven by compatible voltage levels and terminated properly.
How does the strobe (S) pin affect output states in the 74HC251P-E?
When the strobe (S) pin is high, both Y and W outputs enter high-impedance (Z) state regardless of select or data inputs-effectively disconnecting the device from the bus. When S is low, Y and W reflect the selected Dn input and its inverse. This enables hardware-controlled bus sharing without software intervention.
Can the 74HC251P-E be used as a demultiplexer?
No, the 74HC251P-E is strictly an 8:1 multiplexer (data selector), not a demultiplexer. It has eight data inputs and one true/inverted output pair controlled by address lines. Demultiplexing requires one input and multiple outputs-functionality provided by devices like the 74HC138, not the 74HC251P-E.
What is the thermal performance limit for continuous operation of the 74HC251P-E?
The 74HC251P-E is rated for continuous operation from –40°C to +85°C ambient temperature. Its absolute maximum junction temperature is not explicitly stated, but with 500 mW maximum power dissipation and typical ICC ≤4 µA, self-heating is negligible under normal conditions-allowing full-spec operation across the entire industrial temperature range without derating.
74HC251P-E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 74HC
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Multiplexer
- Circuit:
- 1 x 8:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 5.2mA, 5.2mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
74HC251P-E FAQ
1.How can I place an order for 74HC251P-E through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC251P-E 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 74HC251P-E reliable?
The price and inventory of 74HC251P-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC251P-E is usually 5 days.
3.What payment methods are accepted for 74HC251P-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC251P-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC251P-E?
74HC251P-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC251P-E 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 74HC251P-E?
For technical support, including 74HC251P-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC251P-E requirements.
6.How does Aetrix verify that 74HC251P-E is sourced from the original manufacturer or authorized distributors?
All 74HC251P-E 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 74HC251P-E meets industry standards.
7.What is the process for return or replacement of 74HC251P-E?
All 74HC251P-E units undergo pre-shipment inspection (PSI). If there is an issue with 74HC251P-E, 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 74HC251P-E part is unused and in its original packaging.
Return procedure for 74HC251P-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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