Diodes Incorporated PI5A127UEX

Overview

PI5A127UEX from Pericom Semiconductor is a dual single-pole single-throw (SPST) analog switch with normally closed (NC) configuration, designed for rail-to-rail signal routing in audio/video paths and low-distortion switching applications. It operates from +2V to +6V single supply, delivers 7.2 Ω typical on-resistance at +5V, <5 Ω on-resistance flatness, and 326 MHz –3dB bandwidth. Used in portable instrumentation and telecom signal path selection.

For engineers reviewing the PI5A127UEX datasheet, PI5A127UEX pinout, PI5A127UEX application, or PI5A127UEX equivalent, key selection criteria include on-resistance matching (≤2 Ω), charge injection (1.6 pC typ.), fast switching (t_ON = 7 ns typ.), and MSOP-8 package compatibility with space-constrained PCB layouts.

Technical Context

The PI5A127UEX integrates two independent NC analog switches with complementary CMOS control logic. Each channel supports bidirectional conduction, rail-to-rail analog voltage swing (0 V to V+), and exhibits matched on-resistance across temperature (ΔR_ON ≤ 2 Ω). Internal ESD protection and low charge injection enable glitch-free switching in precision signal chains.

Its wide –3dB bandwidth (326 MHz) and low crosstalk (–43 dB at 10 MHz) support high-fidelity video and RF-adjacent baseband routing. The device guarantees operation over –40°C to +85°C with full parametric validation at both +3.3V and +5V supplies.

Key Specifications

Pinout & Package

PI5A127UEX is housed in an 8-pin MSOP (U) package, 3.0 mm × 3.0 mm × 1.0 mm body, with exposed pad for thermal enhancement. Pb-free and RoHS-compliant (Green) construction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG721BRMZ and TS5A23157DGSR, PI5A127UEX uniquely balances wide supply range (+2V to +6V), high bandwidth (326 MHz), and robust NC topology-making it optimal for mixed-voltage, high-fidelity signal routing where reliability and rail-to-rail operation are essential.

Availability

PI5A127UEX is available at Aetrix Electronics and suitable for audio routing, video multiplexing, portable instrumentation, and mechanical relay replacement requiring stable component supply and long-term lifecycle support.

Supply support for PI5A127UEX 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

Pericom Semiconductor (now part of Diodes Incorporated) specialized in high-performance analog and timing solutions for communications, computing, and consumer electronics before its 2016 acquisition.

The PI5A127UEX belongs to Pericom's analog switch product line, engineered for low-distortion, high-bandwidth signal routing in portable and industrial systems demanding rail-to-rail operation and minimal charge injection.

FAQ

Is PI5A127UEX compatible with 3.3V logic control while operating from a 5V analog supply?

Yes. PI5A127UEX accepts TTL/CMOS logic levels (V_IH = 2.4 V min, V_IL = 0.8 V max) independent of V+ voltage. It functions correctly with 3.3V GPIOs controlling a 5V analog signal path, eliminating need for external level shifters in mixed-voltage designs.

What is the maximum continuous analog signal voltage it can switch?

The PI5A127UEX supports rail-to-rail analog signals from GND to V+. With V+ = 5.5V (absolute max), the analog signal range is 0 V to 5.5 V. Signals exceeding V+ or going below GND are clamped by internal diodes-forward current must be limited to 30 mA per diode to avoid damage.

Does it support bidirectional signal flow in both ON and OFF states?

Yes-when ON, current flows equally well in either direction between COM and NC (or COM and NO, depending on logic state). When OFF, the switch blocks signals up to V+, with leakage currents specified at ≤0.2 nA at +25°C and ±200 nA over full temperature range.

Can PI5A127UEX replace mechanical relays in DC power switching applications?

It can replace relays for low-power signal switching (≤100 mA pulsed, ≤550 mW total), but not for high-current DC power path control. Its design targets analog signal routing-not power switching-so it lacks overcurrent protection, safe operating area curves, or sustained high-current capability required for true power relay substitution.