Diodes Incorporated PI5A3166CEX

Overview

PI5A3166CEX from Diodes Incorporated is a low-voltage, single-pole single-throw (SPST) CMOS analog switch with 0.8 Ω typical on-resistance at 3.0 V, rail-to-rail signal handling (0 V to V_CC), and operation across 1.65 V to 5.5 V supply. It delivers 200 MHz bandwidth and 2 ns turn-on time at 5.0 V, targeting high-fidelity signal routing in portable instrumentation and battery-powered communications.

For engineers reviewing the PI5A3166CEX datasheet, PI5A3166CEX pinout, PI5A3166CEX application, or PI5A3166CEX equivalent, key selection criteria include guaranteed R_ON flatness ≤0.4 Ω over full signal range, power-off protection for I/O pins, and control input overvoltage tolerance up to 5.5 V independent of V_CC.

Technical Context

The PI5A3166CEX implements a CMOS transmission gate architecture optimized for low-distortion analog and fast digital bus switching. Its control logic is supply-independent, enabling direct interface with baseband processor GPIOs even when V_CC exceeds control voltage - critical for mobile handset power sequencing.

It features ultra-low quiescent current (≤0.1 µA), charge injection ≤35 pC at 5.0 V, and off-isolation >70 dB at 1 MHz. The device maintains stable R_ON across temperature (–40°C to +85°C) and supply voltage, with flatness characterized under multiple bias conditions per datasheet Table 1.

Key Specifications

Pinout & Package

PI5A3166CEX is packaged in a Pb-free, RoHS-compliant 5-pin SC70 (SOT353) package with 0.65 mm pitch and exposed pad thermal performance matching SOT23-5.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TS5A3166DCKR and ADG819BRMZ, PI5A3166CEX offers best-in-class R_ON/supply trade-off at 3.0 V, smallest SC70 footprint, and lowest leakage-ideal for space-constrained, battery-sensitive designs requiring robust off-isolation and power-off safety.

Availability

PI5A3166CEX is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered communications, and computer peripherals requiring stable component supply and long-term industrial temperature support.

Supply support for PI5A3166CEX 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-efficiency power management, signal integrity, and precision analog solutions.

The PI5A3166 belongs to Diodes' high-speed analog switch product line, engineered for low-R_ON, low-leakage, and rail-to-rail performance in portable and battery-operated systems.

FAQ

What is the maximum allowable signal voltage swing for PI5A3166CEX?

The PI5A3166CEX supports rail-to-rail analog signals from 0 V to V_CC, with absolute maximum switch voltage rated at –0.5 V to +7.0 V. Operation outside the 0–V_CC range risks increased distortion and potential latch-up; the device does not support negative supply rails or bipolar signal swings beyond its supply boundaries.

Does PI5A3166CEX require external pull-up or pull-down resistors on the control pin?

No. The S input has defined VIH/VIL thresholds across all V_CC levels (e.g., VIH = 1.8 V at V_CC = 5.5 V) and must be driven actively HIGH or LOW - floating is prohibited. External resistors are unnecessary and may degrade transition speed or increase leakage; direct connection to GPIO or logic buffer is recommended.

Can PI5A3166CEX be used in audio line-level switching without adding audible artifacts?

Yes. With 0.015% THD at 20 Hz–20 kHz, <35 pC charge injection, and <0.4 Ω R_ON flatness, it preserves audio fidelity in line-level (±1 Vpp) paths. Performance is validated per Figure 7 in DS41616 Rev 1-2 using 600 Ω load and 0.5 Vpp sine input - no additional filtering or compensation is required for consumer-grade audio routing.

How does power-off protection function when V_CC = 0 V?

When V_CC is unpowered, internal circuitry disables the switch channel and places both A and B pins in high-impedance state (<5 µA leakage). This prevents back-current from live signal sources into the unpowered system, protecting downstream components and maintaining signal integrity during hot-swap or partial-power-down sequences.