Diodes Incorporated PI5C3245QE

Overview

PI5C3245 from Diodes Incorporated is an 8-bit, 2-port bidirectional bus switch with 5Ω on-resistance, active-low Bus Enable (BE) control, and pin compatibility with 74FCT245 logic devices. It enables direct A↔B bus connection with near-zero propagation delay (0.25 ns), ultra-low quiescent current (0.2 μA typical), and operates over –40°C to +85°C at 5V ±5%. Used in notebook memory expansion and low-power I/O isolation circuits.

For engineers reviewing the PI5C3245 datasheet, PI5C3245 pinout, PI5C3245 application, or PI5C3245 equivalent, key selection considerations include its 5Ω R_ON, 0.25 ns propagation delay under 50 pF load, BE-controlled bidirectional switching, TSSOP/QSOP package options, and compatibility with legacy 74-series transceiver layouts.

Technical Context

The PI5C3245 implements a passive FET-based analog bus switch architecture-no internal logic or level-shifting-where conduction path resistance is determined solely by V_CC and input voltage. Its BE input directly gates all eight A-B channels simultaneously with no internal buffering or timing circuitry.

Switching behavior is purely resistive: propagation delay arises only from R_ON-C_L time constant (≤0.25 ns for 50 pF), and disable/enable times are specified as 1.5–6.5 ns. Input hysteresis (150 mV) ensures noise-immune BE signal recognition across temperature.

Key Specifications

Pinout & Package

Available in two RoHS-compliant, lead-free packages: 20-pin 173-mil wide TSSOP (L20) and 20-pin 150-mil wide QSOP (Q20). Both share identical pin mapping and thermal profile.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit bidirectional bus switch applications.

Compared with SN74CBT3245APWR and 74LVC245APW, the PI5C3245 delivers the lowest R_ON (5 Ω), lowest quiescent current (0.2 μA), and true zero-delay passive switching-making it optimal for 5V battery-sensitive and timing-critical bus extension.

Availability

PI5C3245 is available at Aetrix Electronics and suitable for notebook memory expansion, industrial PLC I/O isolation, legacy ISA bus extension, and test equipment signal routing requiring stable component supply across long production lifecycles.

Supply support for PI5C3245 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 analog ICs, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Malaysia, and Taiwan.

The PI5C3245 belongs to Diodes' high-speed bus switch product line, engineered specifically for low-latency, low-power, pin-compatible replacements of legacy 74-series transceivers in space-constrained and thermally sensitive applications.

FAQ

What is the maximum capacitive load the PI5C3245 can drive while maintaining 0.25 ns propagation delay?

The 0.25 ns propagation delay specification assumes a 50 pF load capacitance, as defined in the switching characteristics table. At higher loads (e.g., 100 pF), the R_ON-C_L time constant increases linearly-resulting in ~0.5 ns effective delay. System-level timing validation is required beyond 50 pF.

Can the PI5C3245 operate reliably at 3.3V V_CC?

No. The PI5C3245 is specified only for 4.75V to 5.25V operation per Absolute Maximum Ratings and DC Electrical Characteristics tables. At 3.3V, R_ON exceeds 15 Ω and BE threshold margins degrade, risking incomplete turn-on and signal corruption.

Is the PI5C3245 suitable for hot-swap applications where V_CC ramps after signal assertion?

No. The device lacks power-sequence immunity: applying A/B signals before V_CC reaches 4.75V violates Absolute Maximum Ratings (inputs limited to –0.5V to 7V relative to GND, but clamp diode conduction occurs below V_CC). Power must be stable before signal activity.

Does the PI5C3245 require external pull-up or pull-down resistors on BE or I/O pins?

No. The BE pin has built-in hysteresis and CMOS-compatible thresholds; A/B pins are passive analog nodes with no internal termination. External resistors are unnecessary unless required by system-level noise or floating-state policies-not by the device itself.