Renesas 74HC257FPEL-E

Overview

74HC257FPEL-E from Renesas Electronics is a quad 2-to-1-line data selector/multiplexer with noninverted 3-state outputs, designed for bus-oriented digital systems. It operates across 2–6 V supply, delivers 10.5 ns typical propagation delay (CL = 50 pF), supports fanout of 15 LSTTL loads, and features low quiescent current (4 µA max at 25°C). It enables dynamic signal routing in microcontroller peripheral interfaces and memory-mapped I/O expansion.

For engineers reviewing the 74HC257FPEL-E datasheet, 74HC257FPEL-E pinout, 74HC257FPEL-E application, or 74HC257FPEL-E equivalent, key selection criteria include its 3-state output control logic, SOP-16 JEITA package compatibility, guaranteed operation from –40°C to +85°C, and compliance with HC-series logic voltage thresholds (VIH = 3.15 V min at VCC = 4.5 V).

Technical Context

This device integrates four independent 2:1 multiplexers sharing a common select input (S) and output enable (OC) control line. Each channel routes either A or B input to its Y output based on S state, while OC independently places all Y outputs into high-impedance mode when asserted high.

Its CMOS HC-family architecture ensures rail-to-rail input compatibility, low input current (≤1 µA), and robust noise immunity (VIH/VIL thresholds defined across full VCC range). The 3-state outputs allow direct connection to shared data buses without external isolation circuitry.

Key Specifications

Pinout & Package

SOP-16 pin package (JEITA standard, FP-16DAV footprint, 1.27 mm pitch), surface-mount compatible with automated assembly and reflow profiles per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad 2-to-1 multiplexer applications.

Compared with SN74HC257DR and MC74HC257ADTR2G, the 74HC257FPEL-E offers Renesas' JEITA-compliant SOP-16 packaging with verified industrial temperature performance and native support for 2 V minimum supply-making it optimal for cost-sensitive industrial controllers where JEDEC footprint flexibility is not required.

Availability

74HC257FPEL-E is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, microcontroller peripheral multiplexing, test equipment signal routing, and legacy system bus interface requiring stable component supply across extended temperature ranges.

Supply support for 74HC257FPEL-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 specializing in microcontrollers, analog, power, and connectivity solutions for industrial, automotive, and enterprise applications.

The 74HC257FPEL-E belongs to Renesas' legacy HC logic product line, engineered for robust interoperability in bus-oriented digital systems where reliability, wide voltage operation, and 3-state bus control are essential.

FAQ

What is the maximum operating frequency supported by the 74HC257FPEL-E?

The 74HC257FPEL-E does not specify a maximum clock frequency in its datasheet because it is a combinational logic device without internal clocking. Its usable speed is determined by propagation delay: 10.5 ns typical (data to Y, VCC = 4.5 V, CL = 50 pF), supporting reliable operation in systems with signal periods ≥25 ns (i.e., ≤40 MHz toggle rate on control inputs). This makes the 74HC257FPEL-E suitable for high-speed data routing in microcontroller-based peripherals and industrial bus interfaces.

Does the 74HC257FPEL-E support 3.3 V logic levels?

Yes, the 74HC257FPEL-E fully supports 3.3 V operation: its specified supply range is 2.0–6.0 V, and input thresholds scale with VCC (e.g., VIH = 2.31 V min at VCC = 3.3 V). At 3.3 V, it delivers 8.5 ns typical propagation delay and maintains 15-LSTTL fanout capability. The 74HC257FPEL-E is commonly used to interface 3.3 V FPGAs or microcontrollers with 5 V peripherals, leveraging its wide voltage tolerance without external level shifters.

How does the output enable (OC) pin function in the 74HC257FPEL-E?

The OC pin on the 74HC257FPEL-E is an active-high output control that places all four Y outputs (1Y–4Y) into high-impedance state when driven high, regardless of the S select input state. When OC is low, outputs actively drive according to the S input. This enables bus arbitration in multi-device systems: the 74HC257FPEL-E can be disabled during data transfers by other components, preventing signal contention. OC response time is 11–26 ns (tZH/tHZ), ensuring clean enable/disable transitions.

Is the 74HC257FPEL-E RoHS compliant?

Yes, the 74HC257FPEL-E is RoHS compliant. Renesas Electronics confirms compliance with Directive 2011/65/EU (RoHS 2) for this part, as stated in official product change notices and material declarations. The FP-16DAV package uses Ni/Pd/Au plating on terminals and lead-free solder-compatible construction. Full compliance documentation, including substance concentration reports, is available through Renesas' quality portal for the 74HC257FPEL-E.

What is the thermal resistance (θJA) of the 74HC257FPEL-E in its SOP-16 package?

The 74HC257FPEL-E in SOP-16 (FP-16DAV) package has a junction-to-ambient thermal resistance (θJA) of 130°C/W under standard JEDEC test conditions (1-layer 1-in² copper pad, no airflow). This value assumes minimal PCB copper area; adding thermal vias and 2-oz copper planes can reduce θJA to ~65°C/W. With a maximum power dissipation of 500 mW and 4 µA quiescent current, self-heating is negligible in typical operation - the 74HC257FPEL-E remains within safe junction temperature limits even at +85°C ambient.