Diodes Incorporated PI3C3126LE

Overview

PI3C3126LE from Diodes Incorporated is a 2.5V/3.3V, 4-bit bus switch with individual active-HIGH enables, four 5-Ω low-on-resistance switches, near-zero propagation delay (0.25 ns), and 400+ MHz bandwidth. It operates in rail-to-rail mode, supports hot insertion, and is used in high-speed data routing between memory buses and peripheral interfaces.

For engineers reviewing the PI3C3126LE datasheet, PI3C3126LE pinout, PI3C3126LE application, or PI3C3126LE equivalent, key selection criteria include ON-resistance matching, enable timing (tPZH/tPHZ ≤ 6.5 ns), I/O voltage tolerance (up to 5V), and dual-package availability (TSSOP-14 and QSOP-16).

Technical Context

The PI3C3126LE implements four independent analog bus switches controlled by dedicated BE0–BE3 inputs; each switch connects A_n to B_n with no logic inversion or level translation. Its CMOS transmission-gate architecture delivers rail-to-rail signal pass-through and maintains signal integrity up to 400 MHz.

It features 5 V-tolerant I/Os while powered from 2.5 V or 3.3 V, enabling interoperability with mixed-voltage systems. The device draws only 260–500 µA quiescent current and exhibits <5 pF off-capacitance and ~10 pF on-capacitance-critical for minimizing loading on high-speed traces.

Key Specifications

Pinout & Package

PI3C3126LE is packaged in a Pb-free, green 14-pin TSSOP (L14) with 173-mil width. Pinout follows industry-standard 74XX125/126 configuration and supports hot-insertion via high-impedance disable state.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 4-bit bus switch applications.

Compared with SN74CBT3126PW and 74LVC1G3157GW, PI3C3126LE uniquely supports dual-supply operation (2.5 V/3.3 V), 5 V I/O tolerance, and true per-bit enable control-making it optimal for DDR memory isolation and hot-pluggable interconnects where voltage domain bridging and timing precision are critical.

Availability

PI3C3126LE is available at Aetrix Electronics and suitable for DDR2/DDR3 memory subsystems, PCIe hot-plug backplanes, USB 2.0 dual-phy routing, and multi-core debug trace arbitration requiring stable component supply and long-term industrial lifecycle support.

Supply support for PI3C3126LE 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 solutions for industrial, computing, and communications markets.

The PI3C3126LE belongs to Diodes' high-speed bus switch product line, designed specifically for low-latency, hot-insertion–capable signal routing in memory interfaces, server backplanes, and embedded multi-processor systems.

FAQ

What is the maximum operating frequency supported by PI3C3126LE?

The PI3C3126LE is characterized for >400 MHz bandwidth, verified via small-signal AC analysis and eye-diagram testing under 50 pF load conditions. Its 5 Ω R_ON and 10 pF C_ON yield an RC time constant of ~0.05 ns-well below typical DDR2/DDR3 rise times-enabling reliable operation up to 400+ MHz in properly terminated systems.

Can PI3C3126LE operate with 2.5 V supply while interfacing with 5 V signals?

Yes. PI3C3126LE supports 2.5 V or 3.3 V V_CC operation while tolerating 5 V on all A/B pins. This is achieved via internal clamp diodes and robust oxide design, allowing safe bidirectional signal pass-through between 2.5 V domains and legacy 5 V peripherals without external protection components.

Does PI3C3126LE require external pull-up or pull-down resistors on enable pins?

No. The BE0–BE3 inputs have CMOS-compatible thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and negligible input current (±1 µA). They can be driven directly from standard 2.5 V or 3.3 V logic outputs; external biasing is unnecessary unless open-drain control sources are used.

Is PI3C3126LE pin-compatible with standard 74-series logic devices?

Yes. PI3C3126LE uses the industry-standard 74XX125/126 pinout in both 14-pin TSSOP and 16-pin QSOP packages. Pin-for-pin compatibility enables drop-in replacement of obsolete 74LVC126 or 74CBT126 devices in existing PCB layouts, preserving layout integrity while upgrading to lower R_ON and higher bandwidth.