Diodes Incorporated PI3VT3245-AQE

Overview

PI3VT3245-AQE from Pericom Semiconductor is an 8-bit, 2-port bus switch IC with active-low Bus Enable (BE), 5 Ω typical on-resistance at 3.3 V supply, bidirectional voltage translation (3.3 V ↔ 2.5 V and 2.5 V ↔ 1.8 V), and 0.25 ns propagation delay. It serves as a low-latency level-shifting interface between mixed-voltage domains in memory subsystems and FPGA I/O banks.

For engineers reviewing the PI3VT3245-AQE datasheet, PI3VT3245-AQE pinout, PI3VT3245-AQE application, or PI3VT3245-AQE equivalent, key selection criteria include verified bidirectional voltage translation capability, sub-1 ns enable/disable timing, QSOP-20 package compatibility, and guaranteed 120 mA per channel DC output current under industrial temperature range.

Technical Context

This device implements a CMOS transmission-gate-based bus switch architecture with no internal logic or latching-signal path delay is dominated solely by R_ON–C_LOAD time constant (≤0.25 ns for 50 pF). The BE input controls all eight channels simultaneously in an active-low configuration.

Voltage translation occurs passively via threshold-dependent conduction: with V_CC = 3.3 V and A-side inputs at 3.3 V, B-side outputs settle near 2.5 V; with V_CC = 2.5 V and A-side at 2.5 V, B-side reaches ~1.8 V-enabling interoperability across 3.3 V, 2.5 V, and 1.8 V logic families without external biasing.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AVC8T245RHLR and TXS0108EPWR, PI3VT3245-AQE delivers superior timing performance and higher current drive in a directionless, low-R_ON form factor-making it optimal for high-speed, bidirectional, mixed-voltage interconnects where minimal latency and passive operation are critical.

Availability

PI3VT3245-AQE is available at Aetrix Electronics and suitable for FPGA-to-SDRAM interfaces, PCI Express slot adapters, and industrial sensor hub designs requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for PI3VT3245-AQE 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-performance interface and signal-integrity solutions for computing, communications, and industrial markets.

The PI3VT series was designed specifically for low-latency, bidirectional voltage translation in multi-rail digital systems-targeting FPGA, ASIC, and memory interface applications demanding sub-nanosecond timing and rail-flexible operation.

FAQ

Is PI3VT3245-AQE compatible with 1.8V-only systems?

No. PI3VT3245-AQE requires V_CC to be either 2.5 V or 3.3 V to establish its translation reference. It does not operate with V_CC = 1.8 V. When V_CC = 2.5 V, it translates 2.5 V inputs to ~1.8 V outputs-but the device itself must be powered from 2.5 V or 3.3 V.

Does PI3VT3245-AQE require external pull-up or pull-down resistors on BE or I/O pins?

No. The BE input has internal weak pull-down (per datasheet ICC characterization), and all I/O pins are CMOS-compatible with rail-to-rail swing. External biasing is unnecessary unless specific bus-hold or fail-safe states are required by system-level design.

Can PI3VT3245-AQE be used in hot-swap applications?

Yes-its absolute maximum ratings include –0.5 V to +5.5 V on I/O pins and –0.5 V to +4.6 V on V_CC, supporting controlled power sequencing and transient tolerance. However, BE must be held HIGH (disable state) during insertion to prevent back-driving unpowered domains.

What is the thermal resistance (θ_JA) for the QSOP-20 package?

The datasheet does not specify θ_JA for PI3VT3245-AQE in QSOP-20. Pericom's generic QSOP-20 thermal data (PD-1202) indicates θ_JA ≈ 120°C/W with standard JEDEC 2S2P board conditions. For thermal design, assume 0.5 W max power dissipation and verify junction temperature using measured board layout and airflow.