Diodes Incorporated PI3B3245LE

Overview

PI3B3245LE from Diodes Incorporated is a 3.3V, 8-bit, 2-port bus switch with 5 Ω on-resistance, TTL-compatible control inputs, and hot-insertion capability. It enables bidirectional signal routing between Bus A (A0–A7) and Bus B (B0–B7) with near-zero propagation delay (0.25 ns typical), ultra-low quiescent current (0.2 µA typical), and ESD protection (2 kV HBM). It is used in notebook PC I/O expansion and hot-pluggable peripheral interfaces.

For engineers reviewing the PI3B3245LE datasheet, PI3B3245LE pinout, PI3B3245LE application, or PI3B3245LE equivalent, key selection criteria include its 5 Ω R_ON, 4.5 ns max switching time, 3.3V supply compatibility, TSSOP-20 package footprint, and BE-active-L control logic for system-level hot-swap isolation.

Technical Context

The PI3B3245LE implements an array of eight independent bilateral analog switches controlled by a single active-low Bus Enable (BE) input. Each switch connects corresponding A_n and B_n pins with no level-shifting or buffering-preserving signal integrity and rail-to-rail voltage swing.

Its design eliminates added propagation delay beyond RC time constant (RON × C_L), supports input voltages up to 3.6 V regardless of V_CC, and maintains high-impedance isolation when disabled-critical for hot-insertion and bus contention prevention in multi-drop systems.

Key Specifications

Pinout & Package

PI3B3245LE is packaged in a 20-pin TSSOP (Package Code L), 173-mil wide, RoHS-compliant, lead-free and green device with exposed thermal pad not present in this variant (unlike ZUA).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit bus switch applications.

Compared with SN74CBT3245APW and PI3CH4812LEX, PI3B3245LE delivers optimal balance of low R_ON, compact 20-pin TSSOP packaging, and guaranteed 3.3 V operation-making it preferred for notebook and portable hot-swap I/O where power, size, and signal fidelity are co-constrained.

Availability

PI3B3245LE is available at Aetrix Electronics and suitable for notebook I/O expansion, hot-pluggable USB hub interfaces, PCIe lane multiplexing, and industrial sensor data aggregation requiring stable component supply and long-term lifecycle assurance.

Supply support for PI3B3245LE 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 is a global manufacturer of discrete semiconductors and integrated circuits, specializing in high-performance, energy-efficient solutions for computing, consumer, industrial, and communications markets.

The PI3B3245 belongs to Diodes' NanoSwitch™ family-designed specifically for low-latency, low-power, hot-insertion–capable signal routing in portable and modular electronic systems.

FAQ

What is the maximum allowable input voltage on BE, A, or B pins?

The BE, A, and B pins tolerate up to +3.6 V regardless of V_CC level, enabling direct interfacing with 3.3 V or 5 V logic families without external level shifters. This specification is verified across –40°C to +85°C ambient and is documented in the Absolute Maximum Ratings table (DS40710 Rev 1-2, p.2).

Does PI3B3245LE require external pull-up or pull-down resistors on BE?

No external resistors are required on BE. The input has TTL-compatible thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and draws only ±1 µA leakage current. Driving BE directly from a microcontroller GPIO or dedicated supervisor output meets all functional requirements per Electrical Characteristics (p.2).

Can PI3B3245LE be used in AC-coupled high-speed serial links like USB 2.0?

No-it is not characterized or recommended for AC-coupled signaling. Its 16 pF C_ON and lack of equalization or pre-emphasis make it suitable only for DC-coupled, low-to-moderate speed digital buses (≤100 MHz) such as SMBus, I²C, GPIO, or PCIe x1 base-rate signals.

Is the NC pin (Pin 1) required to be grounded or left floating?

Pin 1 is a true no-connect with no internal bond wire. Diodes Incorporated's mechanical drawings and layout guidelines specify it may be left floating or tied to GND for mechanical stability-no electrical effect either way. No current flows through this pin under any operating condition.