Diodes Incorporated PI5C3245QEX

Overview

PI5C3245QEX from Diodes Incorporated is an 8-bit, 2-port bus switch with 5Ω on-resistance, active-low Bus Enable (BE) control, and pin compatibility with 74FCT245 logic devices. It enables direct, low-noise A↔B bidirectional signal routing in notebook and embedded system data buses without propagation delay or ground bounce.

For engineers reviewing the PI5C3245QEX datasheet, PI5C3245QEX pinout, PI5C3245QEX application, or PI5C3245QEX equivalent, key selection criteria include guaranteed 5Ω R_ON, sub-nanosecond propagation delay, ultra-low 0.2μA quiescent current, and QSOP-20 package compatibility with legacy 245 transceivers.

Technical Context

This device implements a passive FET-based analog bus switch architecture-no internal logic or level-shifting circuitry-where conduction is controlled solely by the BE input. Signal integrity is preserved via near-zero RC delay (0.25 ns time constant into 50 pF), and output isolation is achieved through high-impedance state (±1 μA I_OZH) when disabled.

It operates over –40°C to +85°C at V_CC = 5V ±5%, supports TTL-compatible inputs (V_IL ≤ 0.8V, V_IH ≥ 2.0V), and maintains full functionality across its absolute maximum ratings: –0.5V to 7V on all pins and 120mA per output.

Key Specifications

Pinout & Package

PI5C3245QEX is housed in a 20-pin 150-mil wide plastic QSOP (Q20) package, RoHS-compliant and halogen-free.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit bus switch applications.

Compared with SN74CBT3245APWR and PI74FCT245TQEX, PI5C3245QEX uniquely delivers analog-switch behavior with lowest R_ON, lowest quiescent current, and zero added propagation delay-making it optimal for power-sensitive, timing-critical parallel bus isolation where signal transparency is mandatory.

Availability

PI5C3245QEX is available at Aetrix Electronics and suitable for notebook system design, industrial PLC backplanes, embedded test equipment, and automotive infotainment memory expansion requiring stable component supply and long-term lifecycle support.

Supply support for PI5C3245QEX 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 PI5C3245 belongs to Diodes' high-speed analog bus switch product line, engineered specifically for transparent, low-latency, low-power data path control in portable and embedded systems with strict EMI and battery-life constraints.

FAQ

What is the maximum operating voltage for PI5C3245QEX?

The absolute maximum supply voltage is –0.5 V to +7 V on all pins including V_CC, inputs, and outputs. The recommended operating range is 4.75 V to 5.25 V (5 V ±5%). Exceeding 7 V risks permanent damage, and operation below –0.5 V violates absolute maximum ratings even briefly.

Can PI5C3245QEX be used with 3.3 V logic systems?

No - PI5C3245QEX is specified only for 5 V operation. Its VIH minimum is 2.0 V and VIL maximum is 0.8 V, but internal switch threshold and R_ON performance are characterized exclusively at V_CC = 5 V ±5%. Using it with 3.3 V supplies results in undefined R_ON, degraded noise margin, and potential latch-up.

Is PI5C3245QEX pin-compatible with PI5C3245LEX?

Yes - both share identical 20-pin QSOP (Q20) and TSSOP (L20) footprints and pin functions. PI5C3245QEX uses the 150-mil wide QSOP package, while PI5C3245LEX uses the 173-mil wide TSSOP. Mechanical dimensions differ, but electrical pin mapping and signal roles are fully identical.

Does PI5C3245QEX support hot-swap or live-insertion?

Yes - its rail-to-rail input voltage tolerance (–0.5 V to +7 V), 0 V tolerant outputs in high-Z state, and absence of internal latches make it suitable for hot-swap applications. However, BE must be held inactive (high) during insertion until V_CC stabilizes to prevent transient glitches on A/B ports.