Diodes Incorporated PI3VT3245-AQEX

Overview

PI3VT3245-AQEX from Pericom Semiconductor is an 8-bit, 2-port bus switch IC with active-low Bus Enable (BE) control, 5 Ω typical on-resistance at 3.3 V supply, 0.25 ns propagation delay, and bidirectional voltage translation between 3.3 V ↔ 2.5 V or 2.5 V ↔ 1.8 V domains. It operates across –40°C to +85°C ambient and supports level-shifting in memory and I/O expansion interfaces.

For engineers reviewing the PI3VT3245-AQEX datasheet, PI3VT3245-AQEX pinout, PI3VT3245-AQEX application, or PI3VT3245-AQEX equivalent, key selection criteria include verified on-resistance tolerance, BE-controlled high-impedance isolation timing (tPZH/tPHZ ≤ 9.8 ns), dual-supply translation capability, and QSOP-20 package compatibility with legacy 150-mil footprint designs.

Technical Context

This device implements a CMOS-based analog bus switch architecture-no internal logic or latching-where conduction path resistance and capacitive loading directly determine signal integrity. Its voltage translation behavior arises from V_CC-referenced threshold design: when V_CC = 3.3 V, A/B pins translate 3.3 V inputs to ~2.5 V outputs; at V_CC = 2.5 V, outputs settle near 1.8 V.

The BE input controls all eight switches simultaneously in active-low mode, enabling fast enable/disable transitions (tPZH/tPHZ ≤ 9.8 ns) with minimal RC-induced delay (0.25 ns typical into 50 pF). Input capacitance is 3.5 pF, and off-state A/B capacitance is 5.0 pF-critical for high-speed bus isolation.

Key Specifications

Pinout & Package

PI3VT3245-AQEX is packaged in a Pb-free, green-compliant 20-pin QSOP (package code Q), 150-mil wide, with 0.65 mm lead pitch and JEDEC MO-137B/AD compliant outline.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AVC8T245RGHR and TXB0108PWR, PI3VT3245-AQEX delivers lower on-resistance, deterministic BE-controlled isolation, and true bidirectional voltage translation without direction logic-making it optimal for fixed-path, low-latency memory and I/O expansion where timing predictability is critical.

Availability

PI3VT3245-AQEX is available at Aetrix Electronics and suitable for memory interface expansion, processor I/O bridging, legacy peripheral integration, and industrial sensor hub applications requiring stable component supply and long-term industrial lifecycle support.

Supply support for PI3VT3245-AQEX 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

Pericom Semiconductor (acquired by Diodes Incorporated in 2016) specialized in high-speed interface, timing, and signal-integrity solutions for communications, computing, and industrial systems.

The PI3VT series targets low-latency, low-R_ON bus switching in mixed-voltage digital systems-designed specifically for voltage translation and isolation in memory, I/O, and peripheral interconnects without adding propagation delay or logic complexity.

FAQ

What is the maximum continuous current per switch channel?

The absolute maximum DC output current is 120 mA, but the recommended operating limit is 20 mA per channel to maintain R_ON stability and thermal safety. At 20 mA and 5 Ω R_ON, voltage drop remains below 100 mV-ensuring logic-level integrity across all temperature ranges.

Can PI3VT3245-AQEX translate 3.3 V to 1.8 V directly?

No-this device does not support direct 3.3 V to 1.8 V translation. Its translation ratios are fixed: V_CC = 3.3 V yields ~2.5 V output; V_CC = 2.5 V yields ~1.8 V output. A two-stage cascade (3.3 V → 2.5 V → 1.8 V) would be required for full 3.3 V-to-1.8 V conversion.

Is the BE pin compatible with 1.8 V logic controllers?

Yes-the BE input accepts VIH ≥ 2.0 V and VIL ≤ 0.8 V over full temperature range, making it compatible with 2.5 V and 3.3 V logic families. For 1.8 V controllers, a level-shifter or pull-up to V_CC is required to meet VIH specification.

Does PI3VT3245-AQEX require external biasing or termination resistors?

No external biasing is needed-the device performs passive voltage translation based solely on V_CC. Termination resistors are not integrated and must be placed externally per system impedance requirements (e.g., 50 Ω parallel termination on high-speed buses), as the switch presents only 5 Ω R_ON and 11.2 pF C_ON.