Diodes Incorporated PI3VT3245QE

Overview

PI3VT3245QE from Pericom Semiconductor is an 8-bit, 2-port bus switch IC with active-low Bus Enable (BE) control, 5Ω typical on-resistance at 3.3V supply, 2.5V/3.3V dual-supply operation, and bidirectional voltage translation (3.3V↔2.5V and 2.5V↔1.8V). It serves as a low-latency level-shifting interface between mixed-voltage domains in memory expansion and peripheral interconnect subsystems.

For engineers reviewing the PI3VT3245QE datasheet, PI3VT3245QE pinout, PI3VT3245QE application, or PI3VT3245QE equivalent, key selection criteria include verified on-resistance (5–30Ω across VCC and VIN conditions), propagation delay ≤0.25ns, enable/disable timing (1.5–9.8ns), input/output capacitance (3.5/5.0/11.2pF), and Pb-free QSOP-20 packaging compliance.

Technical Context

The PI3VT3245QE implements eight independent analog CMOS transmission gates controlled by a single active-low BE signal, enabling simultaneous connection or high-impedance isolation of A0–A7 and B0–B7 buses. Its submicron CMOS process ensures near-zero intrinsic propagation delay-system-level delay is dominated solely by RC time constant (RON × CL), not gate logic.

Voltage translation occurs passively via supply-rail referenced switching: with VCC = 3.3V and VIN = 3.3V, output clamps to ~2.5V; with VCC = 2.5V and VIN = 2.5V, output settles near 1.8V. No internal level-shift circuitry or direction control is present-translation is inherent to the switch's conduction threshold and supply configuration.

Key Specifications

Pinout & Package

PI3VT3245QE is packaged in a 20-pin, 150-mil wide Pb-free & Green QSOP (Q) package with standard 0.65mm lead pitch and 0.203mm minimum lead thickness.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AVC8T245RHLR and FXMA2102UMX, PI3VT3245QE uniquely delivers true bidirectional, BE-gated, low-RON translation in a standard QSOP-20 package-critical for legacy parallel bus upgrades where direction pins and package conversion are prohibitive.

Availability

PI3VT3245QE is available at Aetrix Electronics and suitable for memory expansion interfaces, peripheral I/O bridges, low-power sensor hubs, and legacy system upgrades requiring stable component supply and long-term obsolescence management.

Supply support for PI3VT3245QE 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 was a fabless provider of high-speed interface and signal integrity solutions, acquired by Diodes Incorporated in 2016; its legacy timing, switching, and signal conditioning products remain widely deployed in industrial and communications infrastructure.

The PI3VT series targets mixed-voltage parallel bus interfacing-designed specifically for seamless, low-latency voltage translation in DDR, PCI, and legacy microprocessor expansion applications without direction control overhead.

FAQ

What is the maximum continuous current per channel for PI3VT3245QE?

The device supports up to 120mA total output current, but per-channel current is limited by on-resistance and thermal dissipation. At 5Ω RON and 100mV allowable drop, safe continuous current per switch is ≤20mA. Exceeding this risks voltage margin loss and localized heating-designers should verify worst-case IR drop under full-bus loading.

Can PI3VT3245QE translate 5V signals?

No. Absolute maximum input voltage is +5.5V, but functional operation is specified only for 1.8V, 2.5V, and 3.3V domains. Applying 5V inputs violates the 3.3V VCC limit and risks latch-up or permanent damage. It is not 5V-tolerant and must be used strictly within its rated supply and input voltage ranges.

Is PI3VT3245QE pin-compatible with PI3VT3245Q?

Yes. PI3VT3245QE is the Pb-free & Green variant of PI3VT3245Q, sharing identical pinout, electrical specifications, and mechanical dimensions. The "E" suffix denotes RoHS-compliant materials and JEDEC-standard reflow profile compliance-no design or layout changes are required for migration.

Does PI3VT3245QE require external pull-up or pull-down resistors on BE?

Yes. The BE pin has no internal pull-up or pull-down. To ensure defined state at power-up, a 10kΩ pull-up to VCC is recommended for default-disabled (high-impedance) operation, or pull-down for default-enabled behavior. Unbiased BE may float, causing unpredictable bus connection states during reset or brown-out conditions.