Diodes Incorporated PI3VT3245LE

Overview

PI3VT3245LE from Pericom Semiconductor is an 8-bit, 2-port bus switch IC designed for bidirectional voltage translation between 3.3V/2.5V and 2.5V/1.8V domains, featuring 5Ω typical on-resistance, active-low bus enable (BE), and operation across –40°C to +85°C ambient. It functions as a low-latency level-shifting interface in mixed-voltage memory or data bus interconnects.

For engineers reviewing the PI3VT3245LE datasheet, PI3VT3245LE pinout, PI3VT3245LE application, or PI3VT3245LE equivalent, key selection criteria include verified 5Ω R_ON, sub-nanosecond propagation delay (0.25 ns), dual-supply voltage translation capability, and Pb-free TSSOP-20 packaging compliance.

Technical Context

The PI3VT3245LE implements eight independent analog switches controlled by a single active-low BE signal, enabling simultaneous connection or high-impedance isolation of A0–A7 and B0–B7 ports. Its CMOS transmission-gate architecture supports bidirectional signal flow with no direction pin required.

Voltage translation occurs passively via supply-rail referenced switching: with V_CC = 3.3V, it translates 3.3V inputs to ~2.5V outputs; with V_CC = 2.5V, it translates 2.5V inputs to ~1.8V outputs - confirmed by V_PASS measurements of 2.3–2.9V and 1.8V respectively.

Key Specifications

Pinout & Package

PI3VT3245LE is packaged in a Pb-free, RoHS-compliant 20-pin TSSOP (Thin Shrink Small Outline Package) with 0.65 mm pitch, 4.4 mm width, and 6.5 mm length. Pin 1 is marked by a notch or dot; pin 10 is GND, pin 20 is V_CC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AVC8T245RHLR and TXS0108EPWR, PI3VT3245LE delivers lower R_ON, sub-nanosecond delay, and deterministic voltage translation without direction logic or auto-sensing ambiguity - critical for timing-sensitive memory and high-speed interconnects.

Availability

PI3VT3245LE is available at Aetrix Electronics and suitable for DDR memory interfaces, PCIe Gen1 isolation, embedded microcontroller expansion buses, and industrial I/O module voltage bridging requiring stable component supply across extended temperature ranges.

Supply support for PI3VT3245LE 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 (now part of Diodes Incorporated) specialized in high-speed interface ICs, including clock buffers, USB switches, and voltage translators, with focus on signal integrity and low-power design.

The PI3VT series targets mixed-voltage digital interconnects in computing, networking, and industrial systems, emphasizing low R_ON, near-zero delay, and seamless rail-to-rail translation without external components.

FAQ

What is the maximum continuous current per channel for PI3VT3245LE?

The device supports up to 120 mA DC output current per switch, validated under maximum ratings with thermal derating applied above +85°C ambient. This rating assumes proper PCB copper area and airflow; sustained 120 mA operation requires thermal vias and ≥1 in² 2-oz copper pour beneath the TSSOP package.

Can PI3VT3245LE translate 1.8V to 3.3V signals?

No - PI3VT3245LE performs only step-down translation: 3.3V → 2.5V or 2.5V → 1.8V. Its pass-gate structure lacks level-shifting circuitry for upward translation; attempting 1.8V input with 3.3V V_CC results in degraded noise margin and undefined V_OUT due to threshold limitations.

Is the BE pin internally pulled up or down?

The BE pin has no internal pull-up or pull-down; it is a high-impedance CMOS input requiring explicit logic-level drive. A 10 kΩ external pull-up to V_CC is recommended for default high-Z state during power-up or reset, ensuring all switches remain disabled until firmware asserts BE low.

Does PI3VT3245LE require decoupling capacitors?

Yes - a minimum 0.1 µF ceramic capacitor placed within 2 mm of V_CC and GND pins is required to suppress switching noise and maintain supply stability during fast edge transitions. For systems with >100 MHz data rates, add a parallel 1 µF X7R capacitor to handle bulk transient current.