Diodes Incorporated PS508LEX

Overview

PS508LEX from Diodes Incorporated is an 8-channel single-ended analog multiplexer IC designed for precision signal routing in industrial and test equipment. It supports dual supplies (±5V to ±18V) or single supply (10V–36V), features 125Ω typical on-resistance, 30pF on-capacitance, 0.9pC charge injection, and operates across –40°C to +125°C. It enables high-accuracy data acquisition in programmable logic controllers and battery monitoring systems.

For engineers reviewing the PS508LEX datasheet, PS508LEX pinout, PS508LEX application, or PS508LEX equivalent, this page delivers verified electrical parameters, truth-table–validated switching behavior, rail-to-rail analog signal handling up to ±15V, break-before-make timing, and package-specific thermal and layout guidance for TSSOP-16 implementation.

Technical Context

The PS508LEX implements a CMOS-based 8:1 single-ended analog multiplexer with TTL/CMOS-compatible digital control (EN, A2–A0), enabling precise channel selection under both symmetric (e.g., ±15V) and asymmetric (e.g., VDD = 12V, VSS = –5V) supply conditions. Its break-before-make switching action prevents momentary shorting between channels during address transitions.

It delivers rail-to-rail analog signal handling (VSS –2V to VDD +2V), low leakage (<1nA at 25°C), and stable on-resistance flatness (22Ω typ.) across input voltage range - critical for maintaining gain accuracy in high-impedance sensor front-ends and multimeter input stages.

Key Specifications

Pinout & Package

PS508LEX is housed in a 16-pin TSSOP (173mil wide) package with exposed pad for thermal dissipation and standard JEDEC-compliant footprint. Pin pitch is 0.65mm; body dimensions are 5.0mm × 4.4mm × 1.2mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG1408BRUZ and MAX4617ESE+, PS508LEX uniquely combines wide supply adaptability (±18V/36V), extended temperature operation, and sub-nA leakage - making it the only option qualified for high-reliability industrial PLC I/O modules and automotive-grade battery monitors.

Availability

PS508LEX is available at Aetrix Electronics and suitable for factory automation, programmable logic controllers, and battery monitoring systems requiring stable component supply across extended temperature and high-voltage operating conditions.

Supply support for PS508LEX 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 semiconductor company specializing in discrete, analog, and mixed-signal ICs for industrial, computing, and automotive markets, with manufacturing certified to IATF 16949 and ISO 9001 standards.

The PS508LEX belongs to Diodes' Precision Analog Switches product line, engineered specifically for high-fidelity signal routing in harsh industrial environments where rail-to-rail operation, low leakage, and supply flexibility are non-negotiable.

FAQ

What supply configurations does PS508LEX support?

PS508LEX supports dual supplies from ±5V to ±18V (e.g., VDD = +15V, VSS = –15V) or single supply from 10V to 36V (e.g., VDD = 24V, VSS = 0V). Asymmetric configurations like VDD = 12V and VSS = –5V are explicitly validated per DS41784 Rev 2-2, enabling flexible integration into mixed-rail systems without external level shifting.

How does PS508LEX handle high-impedance sensor inputs?

With 0.03nA typical off-leakage and 30pF on-capacitance, PS508LEX minimizes loading error on sources >10MΩ, such as thermocouples or piezoelectric sensors. Its low charge injection (0.9pC) also reduces pedestal error in sample-and-hold circuits, preserving DC accuracy without requiring guard traces or active guarding.

Is PS508LEX pin-compatible with PS509LEX?

No - PS508LEX and PS509LEX share the same 16-pin TSSOP package but differ electrically and functionally. PS508LEX uses A2–A0 for 8:1 selection and has one drain (D); PS509LEX uses A1–A0 for differential 4:1 selection and has two drains (DA, DB). Their pinouts are mutually incompatible, requiring separate PCB layouts.

Does PS508LEX require external decoupling capacitors?

Yes - DS41784 specifies 0.1µF to 10µF decoupling capacitors between VDD and GND, and between VSS and GND. This is mandatory to suppress supply transients caused by switching events, maintain PSRR >60dB, and prevent coupling of digital noise into analog paths - especially critical in high-resolution data acquisition systems.