Diodes Incorporated PI3CH3253LEX

Overview

PI3CH3253LEX from Diodes Incorporated is a low-voltage, high-bandwidth 2-channel 4:1 analog multiplexer/demultiplexer with independent active-low enables (ENA/ENB), 4 Ω on-resistance, 500 MHz –3 dB bandwidth, and rail-to-rail signal switching capability up to 5 V with 3.3 V supply. It serves as a high-fidelity signal path selector in high-speed digital interconnects and data acquisition front-ends.

For engineers reviewing the PI3CH3253LEX datasheet, PI3CH3253LEX pinout, PI3CH3253LEX application, or PI3CH3253LEX equivalent, key selection criteria include sub-1 ns propagation delay, 8 kV HBM ESD rating, 1.8–3.3 V supply compatibility, and TSSOP-16 package footprint for space-constrained PCB layouts.

Technical Context

The PI3CH3253LEX implements dual independent 4:1 analog switches with separate enable controls per channel (ENA/ENB), each selecting one of four bidirectional I/O pairs (IA0–IA3 and IB0–IB3) to route to corresponding Y outputs. Its switch architecture delivers near-zero added propagation delay and supports hot insertion in backplane systems.

It operates across 1.8 V, 2.5 V, and 3.3 V supplies while maintaining 5 V I/O tolerance in both ON and OFF states. Dynamic performance includes –60 dB crosstalk and –60 dB off-isolation at 500 MHz, enabling use in DDR clock routing, PCIe Gen3 signal switching, and multi-source ADC/DAC channel selection.

Key Specifications

Pinout & Package

PI3CH3253LEX is packaged in a 16-pin TSSOP (173-mil wide, L suffix), with 0.65 mm pitch and exposed thermal pad (not electrically connected). Pinout is identical across TSSOP and QSOP variants; UQFN variant uses different pin mapping.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TMUX1574RTER and ADG732BRUZ, PI3CH3253LEX uniquely delivers dual independent 4:1 paths, 500 MHz bandwidth, and 5 V I/O tolerance at 1.8 V supply-enabling compact, mixed-signal routing without auxiliary components.

Availability

PI3CH3253LEX is available at Aetrix Electronics and suitable for PCIe Gen2 switching, USB 3.0 routing, and multi-source ADC front-ends requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for PI3CH3253LEX 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 management solutions for industrial, computing, and communications markets.

The PI3CH3253LEX belongs to Diodes' NanoSwitch™ portfolio, engineered specifically for low-latency, high-fidelity analog signal routing in next-generation data infrastructure and portable electronics.

FAQ

Does PI3CH3253LEX support 5 V logic inputs when powered from 1.8 V?

Yes. The device features 5 V tolerant I/O pins across all supply voltages (1.8 V, 2.5 V, 3.3 V), allowing direct interface with 5 V microcontrollers or legacy peripherals without external level shifters. Input clamp diodes and internal protection circuitry maintain safe operation up to 6 V for short transients.

What is the maximum signal frequency supported without significant attenuation?

The –3 dB bandwidth is specified at 500 MHz under standard test conditions (3.3 V supply, 50 Ω source/load). At this frequency, insertion loss remains below 3 dB, preserving signal fidelity for USB 3.0, PCIe Gen2, and HD video applications. Performance degrades gradually beyond 500 MHz due to parasitic capacitance and RON–COUT time constant.

Can ENA and ENB be tied together for single-enable operation?

Yes. ENA and ENB may be connected to a common control line to enable both channels simultaneously. This configuration reduces GPIO usage and simplifies firmware control, though it forfeits independent channel gating. No additional external components are required, and logic thresholds remain compatible across all supply voltages.

Is thermal pad connection required for reliable operation?

No. The TSSOP package (L suffix) used in PI3CH3253LEX does not include an electrically functional thermal pad. The exposed pad is non-connected and may be left floating or grounded for mechanical stability only. Thermal dissipation is managed via leads and PCB copper; junction-to-ambient θJA is 120°C/W in standard JEDEC layout.