Diodes Incorporated PI5C33X257BE

Overview

PI5C33X257BE from Pericom Semiconductor is a 12-channel, 2:1 analog bus switch with three-state outputs, designed for high-speed data path selection in memory and I/O expansion systems. It features 5 Ω typical on-resistance, near-zero propagation delay (0.25 ns), ultra-low quiescent current (0.2 µA), and operates over –40°C to +85°C ambient temperature - enabling use in portable notebook memory buses.

For engineers reviewing the PI5C33X257BE datasheet, PI5C33X257BE pinout, PI5C33X257BE application, or PI5C33X257BE equivalent, key selection criteria include on-resistance matching across channels, enable/select timing (tSY ≤ 5.2 ns), output capacitance (CON = 14 pF), and Pb-free BQSOP-48 package compatibility with high-density PCB layouts.

Technical Context

The PI5C33X257BE implements twelve independent bidirectional analog switches, each controlled by one of two select lines (S0–S2) and a global enable (En). All switches operate with rail-to-rail signal handling (–0.5 V to +7.0 V), supporting both 3.3 V and 5 V logic domains without level shifting.

Its architecture eliminates propagation delay beyond RC time constant (RON × CL), delivering deterministic signal routing where tIY is load-dependent but bounded at 0.25 ns for CL = 50 pF. The device draws only 0.1 µA ICC in quiescent state and exhibits no ground bounce due to absence of internal latching or clocked logic.

Key Specifications

Pinout & Package

Package: 48-pin BQSOP (150 mil wide, Pb-free & Green compliant), 3.80 mm × 9.80 mm body, 0.75 mm height, 0.50 mm lead pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PI3CH485BEX and SN74CBT3384DBR, the PI5C33X257BE uniquely delivers 12-channel density, dual-voltage compatibility (3.3 V/5 V), and Pb-free BQSOP packaging - making it optimal for next-generation notebook memory expansion where channel count, thermal margin, and environmental compliance are jointly critical.

Availability

PI5C33X257BE is available at Aetrix Electronics and suitable for memory expansion bus design, notebook I/O multiplexing, PCI add-in card selection, and industrial control backplane interfacing requiring stable component supply across extended temperature and mixed-voltage environments.

Supply support for PI5C33X257BE 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 timing solutions, acquired by Diodes Incorporated in 2016; its legacy bus switch portfolio remains widely deployed in computing and industrial platforms.

The PI5C33X series targets high-fidelity analog signal routing in memory and peripheral expansion subsystems, emphasizing low RON, zero-delay architecture, and robust mixed-signal interoperability.

FAQ

What is the maximum capacitive load the PI5C33X257BE can drive while maintaining specified tIY?

The datasheet specifies tIY = 0.25 ns maximum at CL = 50 pF. With RON = 5 Ω, the RC time constant is 0.25 ns - meaning performance remains within spec up to ~50 pF. Driving >50 pF increases delay linearly (e.g., 100 pF → ~0.5 ns), but functionality is preserved up to 120 mA output current limit.

Can the PI5C33X257BE be used with 3.3 V logic while powered from 5 V VCC?

Yes. Input voltage ratings extend to –0.5 V to +7.0 V, so 3.3 V logic signals are fully compatible with 5 V VCC operation. However, RON increases slightly at lower input voltages (e.g., 10 Ω at VIN = 2.4 V), which must be accounted for in voltage-drop budgeting.

Does the PI5C33X257BE require external pull-up or pull-down resistors on control pins?

No. The device has built-in hysteresis (VH = 150 mV) and guaranteed VIH/VIL thresholds (2.0 V/0.8 V at 5 V), allowing direct connection to standard CMOS/TTL outputs without biasing. External resistors are unnecessary unless noise immunity in harsh EMI environments is required.

Is thermal derating required for continuous operation at +85°C ambient?

No derating is specified. The device is characterized across –40°C to +85°C and rated for 0.5 W power dissipation. At full channel count and 120 mA per output, junction temperature remains within limits given the BQSOP package's θJA ≈ 90°C/W - verified by Pericom's thermal characterization data.