Diodes Incorporated PI5A4158ZAEX

Overview

PI5A4158ZAEX from Diodes Incorporated (acquired Pericom Semiconductor) is a dual low-voltage SPDT analog switch fabricated in CMOS technology, operating from 1.65V to 5.5V supply, delivering 0.8Ω typical on-resistance at 3.0V, 150 MHz bandwidth, and rail-to-rail signal handling - used for high-fidelity audio routing and high-speed data bus switching in portable instrumentation and mobile handsets.

For engineers reviewing the PI5A4158ZAEX datasheet, PI5A4158ZAEX pinout, PI5A4158ZAEX application, or PI5A4158ZAEX equivalent, key selection criteria include on-resistance flatness (<0.4Ω), break-before-make timing (6–20 ns), control input overvoltage tolerance (5.5V min), and TDFN-12 1×3 mm package compatibility with space-constrained PCB layouts.

Technical Context

The PI5A4158 implements two independent SPDT switches with separate logic controls (S0/S1), each selecting between normally-closed (0Bx) and normally-open (1Bx) paths to a shared common port (Ax). Its CMOS architecture enables rail-to-rail analog signal switching without level-shifting requirements.

Break-before-make timing prevents simultaneous conduction during state transitions, eliminating signal shorting. Control inputs tolerate up to 5.5V regardless of VCC, enabling direct interfacing with higher-voltage GPIOs while powered from 1.65V supplies - critical for battery-powered baseband processor I/O domains.

Key Specifications

Pinout & Package

Package: 12-pin TDFN (1 mm × 3 mm, ZA code), lead-free and RoHS-compliant, thermal pad exposed on bottom for enhanced power dissipation (PD = 350 mW @ +85°C).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual SPDT analog switch applications.

Compared with TSM1014IDCNT and MAX4680EUA+, the PI5A4158ZAEX delivers lower on-resistance, superior noise immunity via dual GND/VCC pins, and true 5.5V-tolerant control - making it optimal for high-fidelity portable instrumentation where signal integrity and supply flexibility are critical.

Availability

PI5A4158ZAEX is available at Aetrix Electronics and suitable for mobile audio routing, USB 1.1 multiplexing, and portable instrumentation requiring stable component supply with guaranteed long-term availability and Pb-free compliance.

Supply support for PI5A4158ZAEX 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 and integrates its high-performance analog switch portfolio into broad-line interface solutions for portable and industrial markets.

The PI5A4158 belongs to Pericom's legacy low-voltage analog switch product line, engineered specifically for battery-powered devices demanding ultra-low RON, rail-to-rail operation, and robust GPIO interfacing without level shifters.

FAQ

What is the maximum allowable signal voltage swing on the A, B, and S pins?

The PI5A4158ZAEX supports rail-to-rail analog signals: the AX and Bx ports accept voltages from 0V to VCC, and the SX control inputs tolerate 0V to 5.5V regardless of VCC level. This allows direct connection to 5V logic outputs while operating from 1.8V supplies, eliminating external level-shifting circuitry in mixed-voltage systems.

Does the device require external pull-up or pull-down resistors on the control inputs?

No. The SX control inputs have internal circuitry that ensures valid logic thresholds without external biasing. The datasheet explicitly states "control input must be held HIGH or LOW; it must not float," confirming internal termination suffices. External resistors are unnecessary and may degrade switching speed or increase leakage.

How does break-before-make timing prevent signal disruption during switching?

Break-before-make guarantees a minimum 6 ns (at 5.0V) dead time between disconnecting the currently active Bx port and connecting the new one. This eliminates momentary shorting between 0Bx and 1Bx paths, preventing transient current spikes, ground bounce, or signal corruption - especially critical in sensor multiplexing and audio routing where channel isolation must be preserved.

Can the PI5A4158ZAEX be used in audio line-level applications with 2 V_PP signals?

Yes. With rail-to-rail operation, –70 dB off-isolation at 1 MHz, and 0.015% THD at 20 Hz–20 kHz, the PI5A4158ZAEX supports line-level audio (≤2 V_PP) without clipping or distortion. Its 150 MHz bandwidth exceeds audio requirements, and low RON (0.8Ω) ensures negligible insertion loss into 600 Ω or higher-impedance loads.