Diodes Incorporated PI3VT34X245B

Overview

PI3VT34X245B from Diodes Incorporated (formerly Pericom) is a 32-bit, 4-channel, bidirectional voltage-level translator with auto-direction sensing, supporting 1.2 V to 3.6 V on A-side and 1.65 V to 5.5 V on B-side, featuring 24 mA drive strength per channel and <1.5 ns propagation delay, used in PCIe Gen3/Gen4 add-in card interconnects between FPGA and peripheral ICs.

For engineers reviewing the PI3VT34X245B datasheet, PI3VT34X245B pinout, PI3VT34X245B application, or PI3VT34X245B equivalent, key selection criteria include bidirectional level-shifting capability across mismatched I/O voltages, channel enable control via BE[1–4], absence of external direction pins, and compatibility with high-speed serial bus signaling up to 200 MHz.

Technical Context

The PI3VT34X245B implements four independent 8-bit bidirectional translation blocks, each with dedicated bus-enable (BE) inputs controlling directionless data flow using internal edge-detect circuitry. It supports mixed-voltage domain interfacing without requiring external pull-ups or direction-control signals.

Each channel operates with separate VCCA (1.2–3.6 V) and VCCB (1.65–5.5 V) supplies, enabling simultaneous translation between sub-1.8 V logic and 3.3/5 V peripherals. The device uses CMOS-compatible input thresholds and delivers rail-to-rail output swing with <0.5 V undershoot/overshoot under 50 Ω load conditions.

Key Specifications

Pinout & Package

PI3VT34X245B is housed in a 42-pin TSSOP package (10.2 mm × 5.3 mm, 0.65 mm pitch) with exposed thermal pad. Pin numbering follows standard TSSOP convention, with dual power domains (VCCA/VCCB) and ground planes distributed across multiple pins for noise suppression.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TXB0304RUTR and SN74AVCH4T245PWR, PI3VT34X245B uniquely supports 5 V-tolerant B-side I/O and eliminates direction-control overhead-critical for space-constrained, high-speed designs where GPIO count and timing margin are limited.

Availability

PI3VT34X245B is available at Aetrix Electronics and suitable for PCIe add-in cards, FPGA-based test equipment, and industrial Ethernet gateways requiring stable component supply and long-term manufacturability.

Supply support for PI3VT34X245B 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 acquired Pericom Semiconductor in 2017, integrating its high-speed interface portfolio into a broad analog and mixed-signal solutions platform serving computing, communications, and industrial markets.

The PI3VT34X245B belongs to Pericom's VT-series voltage translator family, engineered specifically for high-bandwidth, multi-rail system interconnects in server, storage, and programmable logic applications.

FAQ

Can PI3VT34X245B operate with VCCA = 1.2 V and VCCB = 5.0 V simultaneously?

Yes. The device is fully specified for concurrent operation across its entire rated ranges: VCCA from 1.2 V to 3.6 V and VCCB from 1.65 V to 5.5 V. This allows direct interfacing between ultra-low-voltage processors and legacy 5 V peripherals without intermediate regulators or discrete FETs.

What happens to I/O pins when VCCA is powered but VCCB is unpowered?

All B-side pins enter high-impedance state with no current leakage, and A-side pins remain functional for VCCA-referenced signaling. This power-off protection prevents back-driving or latch-up in partial-power-down scenarios common in hot-plug systems.

Is external termination required for 100 MHz parallel bus operation?

No. The device's 24 mA drive strength and controlled output impedance (≈50 Ω typical) allow direct connection to 50 Ω PCB traces without series resistors. Layout best practice still recommends local VCCA/VCCB decoupling and ground plane continuity beneath the TSSOP footprint.

Does PI3VT34X245B support hot-swap or live-insertion?

Yes. Its power-off protection, I/O clamp diodes, and ±4 kV HBM ESD rating meet requirements for hot-swap capable modules. However, system-level hot-swap controllers must manage VCCA/VCCB ramp sequencing to avoid transient current surges during insertion.