Diodes Incorporated PI5C33X257BEX

Overview

PI5C33X257BEX from Pericom Semiconductor is a 12-channel, 2:1 analog bus switch multiplexer/demultiplexer with three-state outputs, designed for high-speed data path selection in memory and I/O expansion subsystems. It features 5 Ω typical on-resistance, 0.25 ns propagation delay (CL = 50 pF), ±120 mA output current rating, and operates over –40°C to +85°C ambient temperature - deployed in notebook PC memory bus isolation.

For engineers reviewing the PI5C33X257BEX datasheet, PI5C33X257BEX pinout, PI5C33X257BEX application, or PI5C33X257BEX equivalent, key selection criteria include low on-resistance matching, sub-nanosecond signal integrity, enable/select timing margins, and Pb-free BQSOP-48 thermal and routing compatibility.

Technical Context

The PI5C33X257BEX implements twelve independent bidirectional analog switches controlled by one global enable (En) and one 2:1 select (S) input per group of four channels (YA–YD, YE–YH, YI–YL). Each switch exhibits near-zero propagation delay due to its passive FET architecture and absence of internal logic gates or level shifters.

It supports rail-to-rail analog signal switching from –0.5 V to +7.0 V on all I/O pins, with 6 pF off-capacitance and 14 pF on-capacitance at 1 MHz, enabling clean signal pass-through in 3.3 V and 5 V mixed-voltage systems without level translation.

Key Specifications

Pinout & Package

Package: 48-pin plastic BQSOP (Body size: 10.0 mm × 3.8 mm × 1.6 mm, 150 mil width, Pb-free & Green compliant).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT3384APWR and PI3CHD3245LEX, the PI5C33X257BEX uniquely balances 5 V robustness, 12-channel density, and sub-0.3 ns delay - making it optimal for legacy industrial and notebook platforms requiring proven 5 V bus switching.

Availability

PI5C33X257BEX is available at Aetrix Electronics and suitable for memory bus isolation, notebook I/O expansion, PCIe lane sharing, and industrial control backplane applications requiring stable component supply and long-term lifecycle support.

Supply support for PI5C33X257BEX 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 was a fabless provider of high-speed interface and signal integrity solutions, acquired by Diodes Incorporated in 2016; legacy products maintain full datasheet compliance and long-term support.

The PI5C33X257BEX belongs to Pericom's "CBT-style" analog bus switch family, engineered specifically for low-latency, low-distortion signal routing in memory, storage, and peripheral interconnects.

FAQ

What is the maximum operating voltage for PI5C33X257BEX I/O pins?

The PI5C33X257BEX supports –0.5 V to +7.0 V on all I/O pins (IAn–ILn, YA–YL), independent of VCC. This allows safe interfacing with 5 V TTL, 3.3 V LVTTL, and even legacy 7 V logic families without external clamping diodes or level shifters.

Does PI5C33X257BEX require external pull-up or pull-down resistors on control pins?

No. The En and Sn inputs have built-in hysteresis (150 mV) and guaranteed VIH/VIL thresholds (2.0 V/0.8 V at 5 V), allowing direct connection to standard CMOS outputs. External biasing is unnecessary unless driving from open-drain sources or noisy environments.

Can PI5C33X257BEX be used in hot-swap applications?

Yes - its three-state outputs, ±120 mA short-circuit rating, and 0.2 µA quiescent current make it suitable for hot-swap I/O expansion. However, En must be asserted before power-up, and slew-rate limiting on control lines is recommended to avoid transient glitches during insertion.

Is the BQSOP-48 package RoHS-compliant and lead-free?

Yes. The "X" suffix in PI5C33X257BEX denotes Pb-free & Green compliance per EU RoHS Directive 2011/65/EU and JEDEC JS-001. The package uses matte tin lead finish and halogen-free molding compound, verified via material declarations from Diodes Incorporated.