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Renesas 74HC251FPEL-E
- Part No.:
- 74HC251FPEL-E
- Manufacturer:
- Renesas
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- -
- Datasheet:
-
74HC251FPEL-E.pdf
- Description:
- 74HC251 8-INPUT MULTIPLEXER WITH
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
74HC251FPEL-E from Renesas Electronics is an 8-input digital multiplexer with true (Y) and complement (W) outputs, 3-state enable control via strobe input, operating across 2–6 V supply, with 20 ns typical propagation delay (A/B/C to Y, CL = 50 pF), and SOP-16 JEITA package. It routes one of eight data inputs (D0–D7) to dual outputs under 3-bit address (A, B, C) control and is used in address decoding, data routing, and logic function generation in industrial control and embedded interface circuits.
For engineers reviewing the 74HC251FPEL-E datasheet, 74HC251FPEL-E pinout, 74HC251FPEL-E application, or 74HC251FPEL-E equivalent, key selection criteria include its dual-output (Y/W) capability, 3-state output control via active-low strobe, wide 2–6 V VCC range, low 4 µA static ICC, and SOP-16 JEITA (FP-16DAV) footprint compatibility with standard surface-mount assembly processes.
Technical Context
The 74HC251FPEL-E implements a single 8:1 multiplexer with complementary outputs and independent 3-state output control. Its logic diagram confirms direct NAND/NOR-based gating of D0–D7 inputs using A, B, C select lines and strobe (S) as global enable - S = H forces both Y and W into high-impedance regardless of address state.
It operates within –40°C to +85°C ambient temperature and supports fanout of 10 LSTTL loads. Input thresholds scale with VCC (VIH ≥ 70% VCC, VIL ≤ 30% VCC), and switching performance is specified at CL = 50 pF with 6 ns input rise/fall times - confirming suitability for medium-speed digital interfacing without external buffering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.0–6.0 V - supports mixed-voltage system interfacing (e.g., 3.3 V logic with 5 V legacy peripherals) |
| Propagation Delay | 20 ns typ (A/B/C → Y, CL = 50 pF @ VCC = 4.5 V) - enables reliable operation up to ~25 MHz clocked select transitions |
| Output Drive | ±4 mA @ VCC = 4.5 V - sufficient to drive 10 LSTTL loads or moderate PCB trace capacitance |
| Quiescent ICC | 4 µA max @ Ta = 25°C - suitable for low-power standby modes in battery-backed systems |
| Input Leakage | ±0.1 µA max @ VCC = 6.0 V - minimizes unintended biasing in high-impedance signal paths |
| Strobe Disable Time | 25 ns max (tHZ/tLZ, VCC = 6.0 V) - ensures fast output isolation during bus arbitration or power sequencing |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade environmental reliability |
Pinout & Package
SOP-16 JEITA package (Renesas code FP-16DAV, JEITA PRSP0016DH-B), 5.5 mm × 10.06 mm body, 1.27 mm pitch, gull-wing leads, Ni/Pd/Au plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (D0) | Data input 0 | Low-order data source selected when A=B=C=0; TTL/CMOS compatible input |
| 2 (D1) | Data input 1 | Selected when A=1, B=C=0; shares same electrical specs as D0–D7 |
| 3 (D2) | Data input 2 | Selected when B=1, A=C=0; no internal pull-up/down - requires external termination if floating |
| 4 (D3) | Data input 3 | Selected when A=B=1, C=0; electrically identical to other data inputs |
| 5 (D4) | Data input 4 | Selected when C=1, A=B=0; full rail-to-rail input voltage tolerance (0 to VCC) |
| 6 (D5) | Data input 5 | Selected when A=C=1, B=0; supports DC-coupled analog multiplexing only if within VIL/VIH limits |
| 7 (D6) | Data input 6 | Selected when B=C=1, A=0; no internal hysteresis - susceptible to noise near threshold |
| 8 (D7) | Data input 7 | High-order data source selected when A=B=C=1; maximum input capacitance 10 pF |
| 9 (Y) | True output | Active-high routed data; high-impedance when strobe = H; drives loads directly |
| 10 (W) | Complement output | Inverted version of Y; simultaneously enabled/disabled with Y; eliminates need for external inverter |
| 11 (Strobe) | Enable control | Active-low global output enable; dominant over address inputs - forces Y/W to Z when high |
| 12 (GND) | Ground reference | Primary return path for all I/O and supply currents; must be low-inductance connection |
| 13 (A) | Select bit 0 | LSB of 3-bit address bus; synchronous with B and C for glitch-free selection |
| 14 (B) | Select bit 1 | Mid-bit of address; propagation delay matched to A and C per datasheet timing specs |
| 15 (C) | Select bit 2 | MSB of address; determines D4–D7 routing; no internal debouncing |
| 16 (VCC) | Supply voltage | Power pin for entire logic core; requires local 0.1 µF ceramic decoupling adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Dual true/complement outputs | Eliminates need for external inverter in differential signaling or active-low logic paths |
| 3-state output control | Enables direct connection to shared buses without external tri-state buffers or contention risk |
| Wide 2–6 V supply range | Permits interoperability between 3.3 V microcontrollers and 5 V peripheral subsystems |
| Low quiescent current | 4 µA max ICC allows use in always-on monitoring nodes without significant battery drain |
| High noise immunity | Input thresholds scale with VCC (VIH ≥ 70%, VIL ≤ 30%), maintaining margin across voltage rails |
Applications
| Address Decoding | Logic Function Generation |
|---|---|
Use Scenario: Selecting one of eight memory-mapped peripheral registers in a microcontroller-based PLC module. IC Role / Device Role / Timing Role: 74HC251FPEL-E acts as address decoder, translating 3-bit chip-select lines into individual peripheral enables while providing simultaneous true/complement signals for handshake protocols. Use Value: Reduces gate count by replacing discrete AND/OR networks; dual outputs support ready/busy handshaking without added inverters. | Use Scenario: Implementing a 3-input Boolean function (e.g., majority vote or parity) in a field-replaceable FPGA configuration monitor. IC Role / Device Role / Timing Role: 74HC251FPEL-E serves as programmable logic element, with D0–D7 pre-wired to fixed logic levels representing minterms, and A/B/C driven by status bits. Use Value: Provides deterministic, glitch-free combinational logic with sub-25 ns propagation - faster than many small CPLDs in static configurations. |
| Data Routing Switch | Bus Isolation Interface |
Use Scenario: Dynamically routing sensor data from eight analog front-ends to a single ADC input in an industrial data logger. IC Role / Device Role / Timing Role: 74HC251FPEL-E functions as analog-capable digital switch - D0–D7 accept buffered sensor outputs, Y delivers selected channel, W provides inverted sync pulse. Use Value: Enables time-multiplexed acquisition with hardware-level channel identification via W output, avoiding software overhead. | Use Scenario: Isolating two 8-bit data buses during partial reconfiguration of an FPGA-based motor controller. IC Role / Device Role / Timing Role: 74HC251FPEL-E operates as bidirectional bus gate: strobe controls Y/W tristate to break bus coupling; A/B/C set default pass-through path. Use Value: Prevents bus contention during hot-swap events; 25 ns disable time ensures clean break-before-make behavior in real-time control loops. |
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 | DIP-16 package; identical logic, timing, and DC specs; no JEDEC-compliant SOP variant | Preferred for through-hole prototyping or legacy board repair where SOP rework is impractical | Select SN74HC251N only when DIP footprint and manual soldering are required; not drop-in compatible with 74HC251FPEL-E layout |
| 74HCT251PW | TTL-compatible inputs (VIH = 2.0 V min); otherwise identical AC/DC specs and SOP-16 (TSSOP) package | Required when interfacing with 5 V TTL outputs driving a 3.3 V system powered by 74HC251FPEL-E's 2–6 V range | Choose 74HCT251PW only when input VIH compatibility with legacy 5 V TTL is mandatory; otherwise 74HC251FPEL-E suffices |
Compared with SN74HC251N and 74HCT251PW, the 74HC251FPEL-E offers JEITA-standard SOP-16 packaging for automated SMT assembly, native CMOS input thresholds optimized for mixed-voltage digital systems, and guaranteed operation down to 2.0 V - making it the preferred choice for space-constrained, low-voltage industrial controllers requiring production scalability.
Availability
74HC251FPEL-E is available at Aetrix Electronics and suitable for industrial control panels, embedded instrumentation interfaces, and programmable logic expansion modules requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for 74HC251FPEL-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 Japanese semiconductor manufacturer specializing in microcontrollers, analog and power devices, and logic ICs for industrial, automotive, and infrastructure markets.
The HD74HC251 product line delivers standardized high-speed CMOS multiplexers designed for robust signal routing in noise-sensitive industrial control and test equipment where predictable timing and rail-to-rail compatibility are essential.
FAQ
What is the maximum operating frequency supported by the 74HC251FPEL-E?
The 74HC251FPEL-E does not specify a maximum clock frequency, but its 20 ns typical propagation delay (A/B/C to Y at VCC = 4.5 V, CL = 50 pF) implies reliable operation with address changes up to approximately 25 MHz. System-level timing must account for worst-case delays (51 ns max at VCC = 4.5 V), setup/hold margins, and load capacitance. The 74HC251FPEL-E is intended for asynchronous address/data selection, not synchronous clocked operation.
Does the 74HC251FPEL-E support 3.3 V logic levels?
Yes, the 74HC251FPEL-E fully supports 3.3 V operation: its VCC range is 2.0–6.0 V, VIH is guaranteed ≥ 2.31 V (70% of 3.3 V), and VIL is ≤ 0.99 V (30% of 3.3 V) across temperature. At VCC = 3.3 V, VOH is ≥ 3.13 V (IOH = –4 mA) and VOL is ≤ 0.26 V (IOL = 4 mA), ensuring solid noise margins with standard 3.3 V CMOS drivers and receivers. The 74HC251FPEL-E is commonly deployed in mixed 3.3 V/5 V systems.
Can the 74HC251FPEL-E be used for analog signal switching?
The 74HC251FPEL-E is specified and characterized only for digital logic-level signals. While its CMOS transmission gates can pass analog voltages within 0–VCC, it lacks guaranteed analog parameters such as on-resistance flatness, charge injection, or bandwidth. For analog multiplexing, Renesas recommends dedicated analog switches (e.g., μPD611). The 74HC251FPEL-E should be used only for digital data routing - its 75–275 ns propagation delay variation and undefined analog THD make it unsuitable for audio or precision sensor signal paths.
What is the function of the W output on the 74HC251FPEL-E?
The W output on the 74HC251FPEL-E is the logical complement of the Y output - when Y = HIGH, W = LOW, and vice versa - both updated simultaneously with the same propagation delay. This eliminates the need for an external inverter in applications requiring both polarities (e.g., differential bus enable, active-high/active-low handshaking, or redundant logic verification). W is controlled identically to Y by the strobe input and enters high-impedance when strobe = HIGH.
Is the 74HC251FPEL-E pin-compatible with other 74HC251 variants?
Yes, the 74HC251FPEL-E shares identical pinout with all HD74HC251 variants (e.g., HD74HC251P, HD74HC251RPEL) across DIP-16, SOP-16 JEITA, and SOP-16 JEDEC packages. Pin numbering, signal assignment (D0–D7, A–C, S, Y, W, VCC, GND), and electrical behavior are fully consistent. However, package dimensions differ: FP-16DAV (74HC251FPEL-E) has 5.5 mm width, while FP-16DNV (RPEL) is 3.95 mm wide - requiring separate footprints despite functional equivalence.
74HC251FPEL-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:
- -
74HC251FPEL-E FAQ
1.How can I place an order for 74HC251FPEL-E through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC251FPEL-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 74HC251FPEL-E reliable?
The price and inventory of 74HC251FPEL-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC251FPEL-E is usually 5 days.
3.What payment methods are accepted for 74HC251FPEL-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC251FPEL-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC251FPEL-E?
74HC251FPEL-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC251FPEL-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 74HC251FPEL-E?
For technical support, including 74HC251FPEL-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC251FPEL-E requirements.
6.How does Aetrix verify that 74HC251FPEL-E is sourced from the original manufacturer or authorized distributors?
All 74HC251FPEL-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 74HC251FPEL-E meets industry standards.
7.What is the process for return or replacement of 74HC251FPEL-E?
All 74HC251FPEL-E units undergo pre-shipment inspection (PSI). If there is an issue with 74HC251FPEL-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 74HC251FPEL-E part is unused and in its original packaging.
Return procedure for 74HC251FPEL-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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