Diodes Incorporated PI3A268CZMEX

Overview

PI3A268CZMEX from Diodes Incorporated is a dual SPDT analog switch in a 10-pin UQFN package, supporting ±300mA continuous current and -1.5V to VDD signal swing without negative supply. It features 0.6Ω typical on-resistance at 4.2V, -80dB off-isolation at 100kHz, and break-before-make switching for audio routing in portable headset interfaces.

For engineers reviewing the PI3A268CZMEX datasheet, PI3A268CZMEX pinout, PI3A268CZMEX application, or PI3A268CZMEX equivalent, key selection criteria include AC-coupled audio signal compatibility down to -1.5V, THD <0.025% at 20Hz–20kHz, 100MHz bandwidth, and dual-channel channel matching with ∆RON ≤0.1Ω.

Technical Context

The PI3A268CZMEX implements two independent CMOS SPDT switches with break-before-make timing (20ns) to prevent signal shorting during state transitions. Each channel supports bidirectional analog signals from -1.5V to VDD across a 2.5V–4.2V supply range.

Its architecture delivers low charge injection (35pC), high crosstalk rejection (-72dB), and flat on-resistance (<0.2Ω variation) over the full signal range - enabling distortion-free switching of D-class audio and AC-coupled headset signals in space-constrained mobile designs.

Key Specifications

Pinout & Package

Package: 10-contact Ultra-thin Quad Flat No-Lead (UQFN), 1.4mm × 1.8mm, 0.4mm pitch, ZM10 footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TS3A26746RTWR and ADG884BRMZ, the PI3A268CZMEX uniquely combines dual SPDT integration, -1.5V signal capability, and sub-1Ω on-resistance in a 1.4×1.8mm UQFN - making it optimal for space-constrained, AC-coupled mobile audio routing where negative voltage headroom is critical.

Availability

PI3A268CZMEX is available at Aetrix Electronics and suitable for smartphone headset switching, portable audio DAC routing, D-class amplifier input protection, and USB-C audio adapter signal path applications requiring stable component supply and long-term industrial temperature support (-40°C to +85°C).

Supply support for PI3A268CZMEX 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 analog, logic, and power solutions for consumer, industrial, and automotive markets.

The PI3A268CZMEX belongs to Diodes' analog switch product line, engineered specifically for low-distortion, high-fidelity audio signal routing in battery-powered portable electronics with stringent size and power constraints.

FAQ

What is the maximum allowable negative voltage at NO/NC pins?

The PI3A268CZMEX supports analog input voltages down to -1.5V relative to GND across its full operating temperature range (-40°C to +85°C), provided VDD remains within 2.5V–4.2V. This eliminates the need for external negative bias supplies in AC-coupled headset applications, as confirmed in the Absolute Maximum Ratings and DC Electrical Characteristics tables of DS43171 Rev 1-2.

Does the device require external pull-up or pull-down resistors on IN1/IN2?

No. The PI3A268CZMEX has internally biased inputs with defined VIH (≥1.3V) and VIL (≤0.6V) thresholds and 100mV hysteresis at VDD=2.7V. External resistors are unnecessary unless system-level noise immunity requires stronger drive - but floating inputs must be avoided per datasheet Note 3.

Can PI3A268CZMEX handle 2V_PP audio signals at 20kHz without distortion?

Yes. At VDD=2.7V and 8Ω load, THD is specified at 0.04% for 2V_PP signals from 20Hz to 20kHz. At VDD=3.3V, THD improves to 0.025%, confirming linear operation across the full audio band with no clipping or harmonic generation under these conditions.

Is the UQFN package (ZM10) compatible with standard reflow profiles?

Yes. The PI3A268CZMEX's ZM10 package is rated for infrared reflow (220°C peak, 15s) and vapor-phase reflow (215°C, 60s), per the Absolute Maximum Ratings table. Its Pb-free and green construction complies with JEDEC J-STD-020D moisture sensitivity level 1, allowing floor-life unlimited storage at ≤30°C/60% RH.