Diodes Incorporated PI5C3245LEX

Overview

PI5C3245LEX from Diodes Incorporated is an 8-bit, 2-port bus switch with 5Ω on-resistance, active-low Bus Enable (BE) control, and TSSOP-20 packaging. It provides direct, low-delay interconnection between two 8-bit buses (A0–A7 and B0–B7), supports 5V operation, and delivers ultra-low quiescent current (0.2μA typical) for power-sensitive notebook systems.

For engineers reviewing the PI5C3245LEX datasheet, PI5C3245LEX pinout, PI5C3245LEX application, or PI5C3245LEX equivalent, key selection criteria include propagation delay (<0.25 ns), bus enable timing (1.5–6.5 ns), RoHS/Green compliance, pin compatibility with 74FCT245T, and dual-package availability (TSSOP/QSOP).

Technical Context

The PI5C3245LEX implements a passive FET-based bus switch architecture-no internal logic or level-shifting-ensuring near-zero propagation delay and zero ground bounce. Its BE-controlled switches operate bidirectionally between A and B ports without direction pins or latching behavior.

It functions as a voltage-transparent signal path: when BE is LOW, A_n and B_n are connected via a 5Ω channel; when BE is HIGH, both sides present high-impedance (Hi-Z). Input hysteresis (150 mV) ensures noise-immune BE control under marginal logic transitions.

Key Specifications

Pinout & Package

PI5C3245LEX is packaged in a 20-pin 173-mil wide plastic TSSOP (L20) with exposed pad not present. Pin assignment follows JEDEC MO-153, optimized for board-level signal routing and thermal dissipation in dense PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PI74FCT245T and SN74CBT3245APW, the PI5C3245LEX offers the lowest quiescent current and tightest bus enable timing, making it optimal for power-gated subsystems where nanosecond-level isolation determinism is critical.

Availability

PI5C3245LEX is available at Aetrix Electronics and suitable for notebook system design, industrial PLC backplane interconnect, and automotive infotainment display interface applications requiring stable component supply and long-term lifecycle support.

Supply support for PI5C3245LEX 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 analog ICs, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.

The PI5C3245 belongs to Diodes' high-speed bus switch product line, engineered specifically for low-latency, low-power signal routing in portable computing and industrial control systems where traditional transceivers introduce unacceptable timing or power penalties.

FAQ

What is the maximum capacitive load the PI5C3245LEX can drive without signal degradation?

The PI5C3245LEX is characterized for CL = 50 pF in switching tests, with propagation delay remaining below 0.25 ns. Its 5Ω R_ON and 8pF C_ON yield a time constant of ~0.04 ns, ensuring clean edges up to 200 MHz with proper termination. Driving loads >100 pF may increase rise/fall times but does not affect logic validity.

Can the PI5C3245LEX be used with 3.3V logic systems?

No-the PI5C3245LEX is specified only for 5V ±5% operation (4.75V–5.25V). Its input thresholds (VIH = 2.0V, VIL = 0.8V) and internal switch design require VCC = 5V to ensure guaranteed logic levels and 5Ω R_ON. For 3.3V systems, consider Diodes' PI3CH400 series or TI's SN74CBTLV3245.

Does the PI5C3245LEX support hot insertion or live bus swapping?

Yes-its Hi-Z state (BE = HIGH) presents <1 μA leakage and 6 pF off-capacitance, minimizing disturbance to live buses. The device meets IEC 61000-4-2 Level 4 ESD immunity (±4 kV contact), enabling safe insertion into powered-backplane systems when BE is held HIGH during mating.

How does the PI5C3245LEX handle voltage mismatches between Port A and Port B?

The PI5C3245LEX has no internal voltage regulation-it passes signals transparently. If A-side is at 5V and B-side is at 0V while enabled, current flows through the 5Ω channel (up to 100 mA per pin, per absolute max ratings). System design must ensure voltage domains are compatible or use external clamping to avoid latch-up or overstress.