Diodes Incorporated PI5C3257WEX

Overview

PI5C3257WEX from Diodes Incorporated is a quad 2:1 analog multiplexer/demultiplexer bus switch with three-state outputs, designed for high-speed data routing in digital logic buses. It features 5Ω on-resistance, near-zero propagation delay (0.25 ns), ultra-low quiescent current (0.2 µA typical), and operates at 5V ±5% over –40°C to +85°C ambient. Used in notebook systems and logic-level signal switching where low ground bounce and direct bus connectivity are critical.

For engineers reviewing the PI5C3257WEX datasheet, PI5C3257WEX pinout, PI5C3257WEX application, or PI5C3257WEX equivalent, key selection criteria include verified 5Ω switch R_ON, sub-nanosecond t_IY, E/S-controlled channel selection, QSOP/TSSOP/UQFN package compatibility, and pin-for-pin equivalence with 74F257/74ALS257 logic families.

Technical Context

The PI5C3257WEX implements four independent bidirectional 2:1 analog switches controlled by a shared enable (E) and select (S) input. Each switch connects one of two inputs (I_A0/I_A1, etc.) to its corresponding output (Y_A, etc.) with no level-shifting or buffering - preserving signal integrity via passive FET-based topology.

Its architecture eliminates propagation delay beyond RC time constant (RON × C_LOAD), supports TTL-compatible control inputs (VIH = 2.0 V, VIL = 0.8 V), and maintains high-impedance outputs when disabled - enabling clean bus sharing without contention or shoot-through current.

Key Specifications

Pinout & Package

PI5C3257WEX is packaged in 16-pin QSOP (Q), TSSOP (L), or UQFN (ZHD). The WEX suffix denotes Pb-free, RoHS-compliant, green packaging in tape-and-reel format.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad 2:1 bus switch applications.

Compared with SN74CBT3257DR and 74LVC257PW, PI5C3257WEX delivers superior analog performance (5 Ω R_ON, 0.25 ns t_IY, 0.2 µA I_CC) and true bidirectional signal integrity - making it optimal for mixed-signal bus routing where timing, power, and fidelity are jointly constrained.

Availability

PI5C3257WEX is available at Aetrix Electronics and suitable for high-speed notebook bus switching, legacy logic interface translation, low-power embedded data multiplexing, and test equipment signal path selection requiring stable component supply and RoHS-compliant green packaging.

Supply support for PI5C3257WEX 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and integrated circuits, specializing in high-performance, energy-efficient solutions for consumer, computing, industrial, and automotive markets.

The PI5C3257 belongs to Diodes' Pericom® bus switch product line, engineered specifically for low-distortion, high-speed signal routing in 5 V logic systems - emphasizing minimal propagation delay, low on-resistance, and seamless compatibility with legacy TTL/CMOS standards.

FAQ

Is PI5C3257WEX compatible with 3.3 V logic systems?

No - PI5C3257WEX is specified for 5 V ±5% operation only. Its VIH minimum is 2.0 V and VIL maximum is 0.8 V, but internal switch threshold and R_ON performance are optimized at V_CC = 5 V. Using it at 3.3 V may increase R_ON beyond 10 Ω and degrade timing margins. For 3.3 V systems, consider PI3CH4257 or SN74CBTLV3257.

Does PI5C3257WEX support hot insertion or live swapping?

No - the device lacks built-in hot-swap protection circuitry. Its absolute maximum ratings allow input/output voltages up to –0.5 V to +7.0 V, but simultaneous application of V_CC, GND, and signal voltages outside sequencing order risks latch-up or ESD damage. Power sequencing per datasheet Section 6 is mandatory for reliable operation.

Can PI5C3257WEX be used for analog sensor signal routing?

Yes - its 5 Ω R_ON, 6 pF C_IN/C_OFF, and rail-to-rail analog passband (–0.5 V to V_CC + 0.5 V) make it suitable for DC-coupled analog signals up to ~100 MHz bandwidth. However, THD and noise performance are not characterized; use only where precision is secondary to speed and low distortion.

What is the meaning of the 'WEX' suffix in PI5C3257WEX?

The 'W' indicates green (halogen- and antimony-free), 'E' denotes Pb-free and RoHS-compliant construction, and 'X' specifies tape-and-reel packaging. This suffix confirms full compliance with EU RoHS 3 (2015/863/EU), with bromine/chlorine <900 ppm each and antimony <1000 ppm - verified per Diodes Incorporated's quality documentation.