Diodes Incorporated PI3C3125ZJEX

Overview

PI3C3125ZJEX from Diodes Incorporated is a 2.5V/3.3V, 4-bit, 2-port bus switch with individual active-low enables, featuring 5Ω ON-resistance, <0.25ns propagation delay, and >400MHz bandwidth. It operates rail-to-rail, supports hot insertion, and is used in high-speed data routing between memory buses and peripheral interfaces in embedded computing systems.

For engineers reviewing the PI3C3125ZJEX datasheet, PI3C3125ZJEX pinout, PI3C3125ZJEX application, or PI3C3125ZJEX equivalent, key selection criteria include enable polarity (active-low), 14-pin TSSOP package compatibility, 5V I/O tolerance, and low-impedance signal path integrity for DDR clock/data switching.

Technical Context

The PI3C3125ZJEX implements four independent bilateral analog switches controlled by dedicated BE0–BE3 inputs, each enabling direct A-to-B connection with no added logic delay. Its architecture uses NMOS pass transistors with level-shifted gate drive to support 2.5V/3.3V VCC while tolerating 5V on A/B pins.

Switching behavior follows a simple truth table: when BE_n is LOW, A_n connects to B_n with R_ON = 5Ω (typ); when HIGH, the path enters high-impedance state (I_OZH ≤ ±1µA). No internal pull-ups are integrated-external pull-up on BE pins is required for power-up safety.

Key Specifications

Pinout & Package

PI3C3125ZJEX is packaged in a 14-pin TSSOP (L package), 173-mil wide, RoHS-compliant and halogen-free. 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 bus switch applications.

Compared with SN74CBT3125PWR and PI3C3126LEX, PI3C3125ZJEX uniquely combines 5V I/O tolerance, active-low enables matching 74LVC125, and guaranteed 5Ω R_ON - making it optimal for DDR memory isolation where voltage flexibility and timing predictability are critical.

Availability

PI3C3125ZJEX is available at Aetrix Electronics and suitable for memory bus isolation, PCIe Gen1 signal routing, and hot-dockable peripheral interface applications requiring stable component supply and long-term industrial lifecycle support.

Supply support for PI3C3125ZJEX 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 ICs, specializing in high-performance analog, logic, and power management solutions for industrial, computing, and communications markets.

The PI3C3125 belongs to Diodes' Pericom bus switch product line, engineered specifically for high-bandwidth, low-latency signal routing in memory subsystems and hot-pluggable interconnects where deterministic timing and voltage robustness are mandatory.

FAQ

What is the maximum capacitive load the PI3C3125ZJEX can drive while maintaining signal integrity?

The device is characterized for CL = 50pF in switching tests, with tPLH/tPHL specified at 0.25ns. Its 5Ω R_ON and 10pF C_ON yield an RC time constant of ~0.05ns - well below 1ns rise times. For reliable operation beyond 50pF, ensure source driver strength exceeds 24mA and minimize trace inductance to avoid ringing.

Does PI3C3125ZJEX require external pull-up resistors on its BE pins?

Yes. The datasheet explicitly states a pull-up resistor must be provided on each BE pin for power-up protection, as the device has no internal pull-ups. A 10kΩ resistor to VCC is typical; values between 4.7kΩ and 100kΩ maintain noise immunity while limiting quiescent current.

Can PI3C3125ZJEX be used in automotive applications?

No - PI3C3125ZJEX is not AEC-Q100 qualified. Diodes offers automotive-grade variants (e.g., PI3C3125QEX-A) with PPAP documentation, IATF 16949 manufacturing, and extended temperature validation. Standard PI3C3125ZJEX is rated for –40°C to +85°C ambient but lacks automotive change control and qualification testing.

How does the 5V I/O tolerance function without damaging the 2.5V/3.3V core?

The 5V tolerance is achieved through input protection diodes clamping to VCC and GND, plus oxide-thickened I/O transistors. VIH/VIL thresholds remain referenced to VCC, so logic levels are interpreted correctly even when A/B pins swing to 5V - provided VCC stays within 2.5V–3.3V and current into protection diodes stays below 10mA.