Diodes Incorporated PI4MSD5V9548ALEX

Overview

PI4MSD5V9548ALEX from Diodes Incorporated is an 8-channel I²C bus switch with active-low reset, supporting standard (100 kHz) and fast-mode (400 kHz) I²C protocols, featuring 1.65 V to 5.5 V supply operation, <1 μA standby current at 3.6 V, and 4–24 Ω typical ON-resistance across voltage rails. It enables dynamic routing of I²C signals between one master and up to eight slave buses in multi-sensor industrial monitoring systems.

For engineers reviewing the PI4MSD5V9548ALEX datasheet, PI4MSD5V9548ALEX pinout, PI4MSD5V9548ALEX application, or PI4MSD5V9548ALEX equivalent, key selection considerations include channel enable control via I²C register write, reset timing compliance (≥4 ns low pulse), Vpass voltage translation across mismatched I²C domains, and TSSOP-24/TQFN-24 package compatibility with high-density PCB layouts.

Technical Context

This device implements a digitally controlled analog pass-gate matrix for bidirectional I²C signal switching, with independent channel enable bits stored in an 8-bit I²C-accessible control register. Each channel includes integrated level-shifting capability to support mixed-voltage I²C domains (e.g., 1.8 V master to 3.3 V sensor).

It incorporates a power-on reset circuit triggered by VCC falling below 1.3–1.5 V for ≥5 µs, and supports hot insertion via glitch-free channel switching-no bus contention occurs during reconfiguration because SDA/SCL paths are broken before new connections are made.

Key Specifications

Pinout & Package

Available in RoHS-compliant 24-pin TSSOP (L) and 24-pin TQFN (ZD) packages, both with 0.65 mm pitch and exposed thermal pad (TQFN). Pin mapping is identical across packages; pin numbering differs only for mechanical layout optimization.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar I²C bus switching applications.

Compared with TCA9548APWR and PCA9548ADW, PI4MSD5V9548ALEX uniquely delivers integrated voltage translation, wider supply range (1.65–5.5 V), and asynchronous hardware reset-reducing design complexity in heterogeneous, safety-critical, or low-power I²C systems.

Availability

PI4MSD5V9548ALEX is available at Aetrix Electronics and suitable for industrial sensor hubs, automotive body control modules, and IoT edge gateways requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for PI4MSD5V9548ALEX 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 power management, signal integrity, and connectivity applications.

The PI4MSD5V9548A belongs to Diodes' I²C interface and bus management product line, designed specifically to solve signal routing, voltage domain bridging, and bus contention challenges in resource-constrained embedded systems.

FAQ

What I²C bus speeds does the PI4MSD5V9548ALEX support?

The PI4MSD5V9548ALEX supports standard-mode I²C at up to 100 kHz and fast-mode I²C at up to 400 kHz. Its propagation delay is ≤0.3 ns, and it maintains signal integrity with ≤500 pF total bus capacitance, meeting I²C specification timing margins for both modes without external tuning.

How does the RESET pin function, and what timing is required?

The RESET pin is active-low and asynchronously clears the internal channel control register, disabling all eight channels. A minimum low pulse width of 4 ns is required, and the VCC must fall below 1.3–1.5 V for ≥5 µs to trigger power-on reset. No external debounce circuitry is needed.

Can PI4MSD5V9548ALEX translate between different I²C voltage domains?

Yes-it performs passive voltage translation via its Vpass characteristic: output voltage follows input with a drop of 0.54–1.3 V depending on VCC. For example, with 3.3 V VCC, SDA outputs reach ~2.2 V, enabling interoperability between 1.8 V and 3.3 V slaves without external level shifters.

Is there a way to configure channel selection without using I²C commands?

No-channel enable/disable is exclusively controlled via I²C register writes to the 8-bit control register (address 0x90–0x97). The A0–A2 pins set only the device's slave address; they do not encode static channel configuration. Hardware strapping for channel selection is not supported.