Diodes Incorporated PI3C3245Q

Overview

PI3C3245 from Diodes Incorporated is an 8-bit, 2-port bus switch IC operating at 2.5 V or 3.3 V supply, featuring 5 Ω on-resistance, >400 MHz bandwidth, and active-low Bus Enable (BE) control. It connects Bus A and Bus B ports with near-zero propagation delay (0.25 ns), supports hot insertion, and tolerates 5 V I/O - used in high-speed memory/data bus isolation and FPGA-to-ASIC interconnects.

For engineers reviewing the PI3C3245 datasheet, PI3C3245 pinout, PI3C3245 application, or PI3C3245 equivalent, key selection criteria include on-resistance matching, 5 V I/O tolerance, BE-active-low timing behavior, hot-swap capability, and TSSOP/QSOP package compatibility in space-constrained digital systems.

Technical Context

The PI3C3245 implements a passive FET-based analog bus switch architecture with rail-to-rail signal pass-through and no internal logic buffering. Its 5 Ω R_ON enables minimal voltage drop across A/B pairs under 48 mA load, while low input/output capacitance (C_IN = 3.5 pF, C_ON = 10.0 pF) preserves signal integrity above 400 MHz.

Switching is controlled solely by the BE pin: logic LOW enables bidirectional conduction between corresponding A_n and B_n pins; HIGH places all channels in high-impedance state. No internal level-shifting or direction control logic is present - operation is strictly voltage-transparent and symmetric.

Key Specifications

Pinout & Package

PI3C3245 is available in two RoHS-compliant, lead-free surface-mount packages: 20-pin TSSOP (173 mil wide, code L) and 20-pin QSOP (150 mil wide, code Q). Both packages support standard reflow profiles and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT3245APW and 74LVC245APW, the PI3C3245 uniquely supports dual-supply operation (2.5 V/3.3 V), 5 V I/O tolerance, and true bidirectional zero-delay switching - making it optimal for mixed-voltage hot-swap and high-bandwidth bus isolation where timing transparency is critical.

Availability

PI3C3245 is available at Aetrix Electronics and suitable for memory bus isolation, FPGA interconnect, PCIe Gen1 sharing, and hot-swappable module interface applications requiring stable component supply and long-term industrial availability.

Supply support for PI3C3245 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 analog, logic, and power management solutions for industrial, computing, and communications markets.

The PI3C3245 belongs to Diodes' high-speed bus switch product line, engineered specifically for low-latency, voltage-tolerant signal routing in reconfigurable digital systems and modular hardware platforms.

FAQ

Can PI3C3245 operate with 2.5 V and 3.3 V supplies simultaneously?

No - VCC is a single supply pin; the device operates at either 2.5 V or 3.3 V, not both concurrently. However, its 5 V I/O tolerance allows interfacing with higher-voltage peripherals regardless of VCC setting. The 2.5 V mode supports lower power and reduced noise in battery-powered or thermally constrained designs.

What happens to signal integrity when BE transitions during data transmission?

During BE transition, the switch enters high-Z state within 1.5–9.8 ns (disable time), preventing short-circuits or bus contention. Because R_ON drops cleanly to >100 MΩ and C_OFF is only 5.0 pF, signal reflections and crosstalk remain negligible - verified in eye-diagram testing up to 400 MHz.

Is PI3C3245 suitable for differential signaling like USB or LVDS?

No - it is designed for single-ended CMOS/TTL bus switching only. Its 5 Ω R_ON and lack of matched pair routing make it unsuitable for impedance-controlled differential protocols. For USB 2.0 or LVDS, dedicated differential switches such as PI3USB30532 or SN65LVDS31 should be used instead.

How does PI3C3245 handle ground potential differences between Bus A and Bus B?

It does not compensate for ground offsets - the device assumes common ground reference between A and B sides. If ground differentials exceed ±0.5 V, leakage current may increase and R_ON accuracy degrades. External isolation (e.g., digital isolators) is required for systems with split or isolated grounds.