Diodes Incorporated PI3A27518ZDEX

Overview

PI3A27518ZDEX from Diodes Incorporated is a 6-channel, 2:1 analog multiplexer/demultiplexer with CMOS architecture, rail-to-rail signal handling (0 V to VDD), 5 Ω typical on-resistance at 3.3 V, 380 MHz signal bandwidth, and break-before-make switching. It serves as a high-fidelity signal routing device in SD/SDIO/MMC and qSPI dual-port interfaces.

For engineers reviewing the PI3A27518ZDEX datasheet, PI3A27518ZDEX pinout, PI3A27518ZDEX application, or PI3A27518ZDEX equivalent, key selection criteria include on-resistance flatness (≤2.1 Ω), off-isolation (–66 dB @ 10 MHz), crosstalk rejection (–60 dB @ 10 MHz), wide 1.65–3.6 V supply range, and TQFN-24 package compatibility with high-density PCB layouts.

Technical Context

The PI3A27518ZDEX implements a dual-mode 6-channel switch matrix controlled by two select inputs (IN1, IN2) and an active-low enable (EN̅), supporting four distinct connection configurations per channel group (COM1–3 and COM4–6). Each channel independently routes between normally-open (NOx) and normally-closed (NCx) paths.

Its CMOS design enables rail-to-rail analog operation across 1.65–3.6 V, with propagation delay under 30 ns (TON/TOFF), 4–20 ns break-before-make timing (TD), and low dynamic power consumption (ICC ≤ 3.0 μA). Signal integrity is preserved via low channel capacitance (CCOM(ON) = 21.5 pF) and high off-isolation.

Key Specifications

Pinout & Package

Package: 24-pin TQFN (ZD), 4 mm × 4 mm, 0.5 mm pitch, exposed thermal pad. RoHS-compliant, lead-free, halogen- and antimony-free "Green" construction.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar analog multiplexer applications.

Compared with TMUX1574RTER and ADG732BRUZ, the PI3A27518ZDEX uniquely combines 6-channel 2:1 topology, integrated break-before-make, NC/NO dual-path selection, and industrial temperature support-making it optimal for SDIO/qSPI dual-port routing where signal integrity and switching safety are critical.

Availability

PI3A27518ZDEX is available at Aetrix Electronics and suitable for SD/SDIO dual-port routing, qSPI flash selection, audio signal switching, and industrial video interface applications requiring stable component supply and long-term manufacturability.

Supply support for PI3A27518ZDEX 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 analog ICs, specializing in high-performance, energy-efficient components for consumer, industrial, and communications markets.

The PI3A27518ZDEX belongs to Diodes' Pericom analog switch portfolio, engineered specifically for high-bandwidth, low-distortion signal routing in portable and embedded systems with mixed-voltage interfaces.

FAQ

What is the maximum signal voltage that can be routed through the PI3A27518ZDEX?

The device supports rail-to-rail analog signal operation from 0 V to VDD. With VDD ranging from 1.65 V to 3.6 V, the absolute maximum signal voltage is limited to the supply rails-i.e., signals must stay within –0.3 V to VDD + 0.3 V per datasheet limits, and DC input voltage must not exceed –0.5 V to +4.6 V regardless of VDD.

Does the PI3A27518ZDEX require external pull-up or pull-down resistors on its control pins?

No. The IN1, IN2, and EN̅ inputs have defined logic thresholds (VIH ≥ 0.8×VDD, VIL ≤ 0.2×VDD) and input leakage ≤ ±2.5 μA, allowing direct connection to GPIOs or logic outputs. Floating control inputs are prohibited per datasheet; unused pins must be tied to VDD or GND.

Can the PI3A27518ZDEX be used in automotive applications?

The standard PI3A27518ZDEX is not AEC-Q100 qualified. Diodes states that automotive-grade versions require specific change control-including PPAP capability and IATF 16949 manufacturing-and must be requested separately through authorized sales channels. This part is rated for industrial temperature (–40°C to +85°C) only.

How does the break-before-make timing affect system-level timing budgets?

The guaranteed 4–20 ns break interval (TD) adds deterministic dead time between path transitions. For SDIO or qSPI, this fits within standard command-response gaps (e.g., SDIO CMD response latency >100 μs); no additional timing margin is needed beyond standard protocol timeouts, as the delay is fully contained within the switch's internal logic.