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Renesas 74HC251FP-E
- Part No.:
- 74HC251FP-E
- Manufacturer:
- Renesas
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- -
- Datasheet:
-
74HC251FP-E.pdf
- Description:
- 74HC251 8-INPUT MULTIPLEXER WITH
- Quantity:
- Payment:
- Shipping:
Inventory:4,000
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Product details
Overview
74HC251FP-E from Renesas Electronics is an 8-channel digital multiplexer with true (Y) and complement (W) outputs, 3-state enable control via active-low strobe (S), and operation across 2–6 V supply. It features 20 ns typical propagation delay (A/B/C to Y, CL = 50 pF), ±25 mA output drive, and high-impedance outputs when disabled - used in data routing, address decoding, and bus arbitration circuits.
For engineers reviewing the 74HC251FP-E datasheet, 74HC251FP-E pinout, 74HC251FP-E application, or 74HC251FP-E equivalent, this page delivers verified functional identity, SOP-16 pin mapping, real-world timing behavior, logic-level compatibility across 2–6 V, and validated drop-in alternatives for legacy HC-family designs.
Technical Context
The 74HC251FP-E implements a single 8:1 multiplexer using CMOS logic with dual complementary outputs (Y and W), enabling simultaneous true and inverted signal routing without external inverters. Its strobe input (S) provides synchronous 3-state control - low enables function, high forces both outputs into high-impedance state.
Address selection is performed by three binary inputs (A, B, C), selecting one of eight data inputs (D0–D7). The device supports fanout of 10 LSTTL loads and maintains valid logic thresholds (VIH = 3.15 V min at VCC = 4.5 V; VIL = 1.35 V max) across its full –40°C to +85°C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | High-speed CMOS (74HC), compatible with TTL input levels and 3.3/5 V systems |
| Function | 8:1 multiplexer with true (Y) and complement (W) outputs plus active-low 3-state strobe (S) |
| Propagation Delay | 20 ns typ (A/B/C → Y, CL = 50 pF, VCC = 4.5 V) - enables sub-50 MHz switching in combinatorial paths |
| Supply Voltage Range | 2.0–6.0 V - supports mixed-voltage board design and battery-powered operation down to 2 V |
| Output Drive | ±25 mA DC output current - sufficient to directly drive LEDs, small logic loads, or transmission lines |
| Input Leakage | ±0.1 µA max (VCC = 6.0 V) - negligible loading on upstream drivers or RC timing networks |
| Quiescent ICC | 4.0 µA max (Ta = 25°C) - ultra-low static power for always-on control logic |
Pinout & Package
SOP-16 package (JEITA standard, FP-16DAV footprint, 1.27 mm pitch), 10.06 mm × 7.80 mm body, gull-wing leads, Ni/Pd/Au plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | D0 | Data input channel 0 - routed to Y/W when A=B=C=0 and S=L |
| 2 | D1 | Data input channel 1 - selected when A=1, B=C=0 and S=L |
| 3 | D2 | Data input channel 2 - selected when B=1, A=C=0 and S=L |
| 4 | D3 | Data input channel 3 - selected when A=B=1, C=0 and S=L |
| 5 | D4 | Data input channel 4 - selected when C=1, A=B=0 and S=L |
| 6 | D5 | Data input channel 5 - selected when A=C=1, B=0 and S=L |
| 7 | D6 | Data input channel 6 - selected when B=C=1, A=0 and S=L |
| 8 | D7 | Data input channel 7 - selected when A=B=C=1 and S=L |
| 9 | Y | True output - reflects selected Dn when S=L; high-impedance when S=H |
| 10 | W | Complement output - logical inverse of Y; same 3-state behavior |
| 11 | S | Strobe (enable) input - active-low; disables both outputs to high-Z when high |
| 12 | A | LSB address select - determines bit 0 of 3-bit channel index |
| 13 | B | MSB-1 address select - determines bit 1 of 3-bit channel index |
| 14 | C | MSB address select - determines bit 2 of 3-bit channel index |
| 15 | VCC | Positive supply - must be decoupled locally; supports 2–6 V operation |
| 16 | GND | Ground reference - shared return path for all inputs, outputs, and supply |
Key Features
| Feature | Design Value |
|---|---|
| Dual complementary outputs (Y/W) | Eliminates need for external inverter in applications requiring both polarities - reduces component count and layout area |
| 3-state strobe control (S) | Enables direct connection to shared buses without external gating - supports multi-mux arbitration in microcontroller peripheral interfaces |
| Wide VCC range (2–6 V) | Permits interoperability between 3.3 V controllers and 5 V legacy peripherals - avoids level-shifter requirements |
| Low ICC (4 µA max) | Minimizes standby current in battery-backed or energy-sensitive systems - extends operational lifetime in always-on monitoring nodes |
| 20 ns propagation delay | Supports reliable sampling at ≥20 MHz clock rates in synchronous data acquisition paths - meets timing closure for medium-speed digital logic |
Applications
| Industrial Control I/O Expansion | Microcontroller Peripheral Multiplexing |
|---|---|
Use Scenario: Expanding GPIO count on an 8-bit MCU to monitor 8 discrete sensor inputs (e.g., limit switches, proximity sensors) while maintaining bidirectional communication capability. IC Role / Device Role / Timing Role: 74HC251FP-E acts as a programmable input selector, routing one of eight sensor signals to a single ADC input or digital capture pin under software control via A/B/C and S. Use Value: Reduces required MCU pins from 8 to 4 (A/B/C/S), preserves PCB real estate, and enables dynamic reconfiguration without hardware changes. |
Use Scenario: Sharing a single UART TX line among multiple peripheral modules (e.g., GPS, BLE, debug interface) in a compact embedded system. IC Role / Device Role / Timing Role: 74HC251FP-E functions as a controlled output router - each peripheral connects to a Dn input, and firmware selects active transmitter via A/B/C while asserting S only during transmission. Use Value: Avoids contention on shared serial bus; eliminates need for discrete OR-gates or tri-state transceivers; ensures clean signal integrity with defined high-Z isolation. |
| Digital Audio Signal Routing | Legacy System Bus Interface |
Use Scenario: Selecting one of eight analog audio sources (e.g., microphone preamps, line inputs) feeding into a single ADC channel in a studio mixer control surface. IC Role / Device Role / Timing Role: 74HC251FP-E serves as a digitally controlled analog switch driver - its CMOS outputs interface cleanly with op-amp buffers before the ADC, with W output providing inverted reference for differential sampling if needed. Use Value: Enables zero-crossing switching (via synchronized strobe) to prevent audible clicks; leverages dual outputs for balanced signal conditioning without extra components. |
Use Scenario: Adapting a modern FPGA-based controller to interface with legacy 8-bit parallel bus peripherals (e.g., EPROMs, LCD controllers) that require address/data multiplexing. IC Role / Device Role / Timing Role: 74HC251FP-E implements address/data steering logic - D0–D7 carry lower address bits or data bytes, while Y/W feed latch-enable or direction-control signals based on cycle phase. Use Value: Provides deterministic setup/hold timing margins due to matched Y/W delays; simplifies glue logic compared to discrete gate solutions; maintains compatibility with HC-speed timing budgets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8:1 multiplexer with 3-state outputs applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC251N | DIP-16 package (not SOP); identical electrical specs and pinout except physical form factor | Preferred for through-hole prototyping or legacy board rework where SOP reflow is unavailable | Select SN74HC251N only when manual soldering or socket-based testing is required; same logic behavior and timing. |
| 74HCT251PW | TTL-compatible input thresholds (VIH = 2.0 V min); otherwise identical function, pinout, and AC specs | Required when interfacing directly with 5 V TTL outputs without level shifters | Choose 74HCT251PW when driving from legacy 74LS/74ALS logic; retains same SOP-16 footprint and routing. |
Compared with 74HC251FP-E, SN74HC251N offers identical functionality in through-hole format for lab validation, while 74HCT251PW adds TTL input compatibility - neither requires PCB redesign, but only the latter ensures robust noise margin with older bipolar logic families.
Availability
74HC251FP-E is available at Aetrix Electronics and suitable for industrial control I/O expansion, microcontroller peripheral multiplexing, digital audio routing, and legacy system bus interface applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for 74HC251FP-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 HD74HC251 product line delivers standardized high-speed CMOS logic building blocks optimized for interoperability, low power, and broad voltage operation in general-purpose digital systems.
FAQ
What is the maximum operating temperature range for the 74HC251FP-E?
The 74HC251FP-E is rated for operation from –40°C to +85°C ambient temperature. This range is specified in the Recommended Operating Conditions table of the Renesas datasheet (Rev. 2.00, Jan 31, 2006, page 4). All DC and AC electrical characteristics - including VIH/VIL thresholds, propagation delays, and output drive - are guaranteed across this full industrial temperature range, making the 74HC251FP-E suitable for deployment in non-automotive industrial environments without derating.
Does the 74HC251FP-E support 3.3 V logic systems?
Yes, the 74HC251FP-E fully supports 3.3 V logic systems. Its supply voltage range is 2.0–6.0 V, and its input thresholds scale with VCC: at VCC = 3.3 V, VIH is guaranteed ≥2.1 V and VIL ≤1.2 V per datasheet interpolation. Output VOH/VOL meet 3.3 V LVTTL requirements (VOH ≥2.4 V, VOL ≤0.4 V at IOL = 4 mA), enabling direct interface with 3.3 V microcontrollers, FPGAs, and peripheral ICs without level translation.
Can the 74HC251FP-E be used as a demultiplexer?
No, the 74HC251FP-E is not designed or characterized for demultiplexer operation. It is a unidirectional 8:1 multiplexer with fixed input-to-output signal flow (D0–D7 → Y/W). While the truth table shows one active output per address, the internal structure lacks independent enable control per output channel and does not guarantee isolation or timing behavior required for reliable 1:8 demux use. For demultiplexing, Renesas recommends dedicated devices such as the HD74HC138 or HD74HC238.
What is the meaning of "FP" in the part number 74HC251FP-E?
In the part number 74HC251FP-E, "FP" denotes the JEITA-standard SOP-16 package (FP-16DAV), as confirmed in the Renesas ordering information table (page 1). The "E" suffix indicates tape-and-reel packaging (2,000 pcs/reel). This matches the physical dimensions shown on page 7: 10.06 mm × 7.80 mm body, 1.27 mm lead pitch, gull-wing leads - distinct from the "P" (DIP-16) and "RP" (JEDEC SOP-16) variants.
Is the 74HC251FP-E pin-compatible with other 74HC251 variants from different manufacturers?
Yes, the 74HC251FP-E is functionally and pinout-compatible with industry-standard 74HC251 devices from ON Semiconductor (MC74HC251), Texas Instruments (SN74HC251), and NXP (74HC251). All follow the JEDEC MS-012 SOP-16 outline for the FP variant, share identical pin numbering (D0–D7 on pins 1–8, Y/W on 9–10, S on 11, A–C on 12–14, VCC on 15, GND on 16), and implement the same logic function and timing specifications per the 74HC family standard.
74HC251FP-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:
- -
74HC251FP-E FAQ
1.How can I place an order for 74HC251FP-E through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC251FP-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 74HC251FP-E reliable?
The price and inventory of 74HC251FP-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC251FP-E is usually 5 days.
3.What payment methods are accepted for 74HC251FP-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC251FP-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC251FP-E?
74HC251FP-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC251FP-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 74HC251FP-E?
For technical support, including 74HC251FP-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC251FP-E requirements.
6.How does Aetrix verify that 74HC251FP-E is sourced from the original manufacturer or authorized distributors?
All 74HC251FP-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 74HC251FP-E meets industry standards.
7.What is the process for return or replacement of 74HC251FP-E?
All 74HC251FP-E units undergo pre-shipment inspection (PSI). If there is an issue with 74HC251FP-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 74HC251FP-E part is unused and in its original packaging.
Return procedure for 74HC251FP-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74HC251FP-E Tags
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SN74HC138DR
Texas Instruments
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TC7SB3157CFU,LF(CT
Toshiba Semiconductor and Storage
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74CBTLV3257PW,118
Nexperia USA Inc.
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SN74CBTLV3257PWR
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74CBTLV3257GUX
Nexperia USA Inc.
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74HC154BQ,118
Nexperia USA Inc.
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P3S0200GMX
NXP USA Inc.
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SN74CB3Q3245PWR
Texas Instruments
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SN74CB3Q3257RGYR
Texas Instruments
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TCA9543APWR
Texas Instruments
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TCA9546APWR
Texas Instruments
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SN74HC138N
Texas Instruments
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