Diodes Incorporated PI3B16244AEX

Overview

PI3B16244AEX from Pericom Semiconductor is a 3.3V, 16-bit, 4-port bus switch with near-zero propagation delay (≤4 ns), 5 Ω on-resistance, and industrial temperature range (–40°C to +85°C). It functions as a bidirectional, low-noise signal path selector in high-speed digital backplanes and memory interface routing, replacing legacy 74-series drivers while eliminating ground bounce.

For engineers reviewing the PI3B16244AEX datasheet, PI3B16244AEX pinout, PI3B16244AEX application, or PI3B16244AEX equivalent, key selection criteria include its TTL-compatible control inputs (rail-to-rail up to +5.5V), 48-pin TSSOP package, and absence of added propagation delay beyond RC time constant (≤0.25 ns for 50 pF load).

Technical Context

The PI3B16244AEX implements four independent 4-bit bidirectional analog switches controlled by active-low enable pins (1BE–4BE), each connecting corresponding A- and B-side ports (e.g., 1A0↔1B0) with no directionality constraint. Its CMOS transmission-gate architecture ensures symmetrical on-resistance and rail-to-rail analog signal handling.

Control logic operates at 3.0–3.6 V supply, while input pins tolerate up to +5.5 V regardless of V_CC, enabling mixed-voltage system interfacing. The device contributes no intrinsic propagation delay-only RC delay from 5 Ω R_ON and load capacitance-and draws ≤10 µA quiescent current.

Key Specifications

Pinout & Package

PI3B16244AEX is housed in a 48-pin thin shrink small-outline package (TSSOP-A), 240 mil wide, with 0.5 mm lead pitch and exposed thermal pad (not electrically connected). Pin 1 is marked by a dot; pins are numbered counter-clockwise from top-left corner.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit bus switch applications.

Compared with SN74CBT16244DGGR and PI3CH480E, PI3B16244AEX uniquely combines 3.3 V operation, 5.5 V-tolerant enables, and 4-port granularity-enabling compact, low-power, mixed-voltage bus routing without redesigning power or logic-level architecture.

Availability

PI3B16244AEX is available at Aetrix Electronics and suitable for high-speed memory interfacing, FPGA I/O expansion, PCIe lane multiplexing, and JTAG TAP sharing requiring stable component supply across industrial and telecom production cycles.

Supply support for PI3B16244AEX 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 (now part of Diodes Incorporated) specialized in high-speed interface and timing solutions for datacom, telecom, and computing markets before its 2016 acquisition.

The PI3B16244 belongs to Pericom's NanoSwitch™ family-designed specifically for zero-delay, low-R_ON signal routing in 3.3 V digital systems where ground bounce and timing skew must be eliminated.

FAQ

Can PI3B16244AEX operate with V_CC = 2.5 V?

No. The device is specified only for 3.0–3.6 V operation. At 2.5 V, R_ON increases significantly (>15 Ω), propagation delay exceeds 4 ns, and control input thresholds become unreliable. Operation outside this range violates Absolute Maximum Ratings and may cause functional failure.

Does PI3B16244AEX require external pull-up or pull-down resistors on enable pins?

No. Enable inputs (1BE–4BE) have internal weak pull-downs (typ. 100 kΩ) ensuring defined low state during power-up or floating conditions. External resistors are unnecessary unless specific timing or noise immunity requirements dictate stronger biasing.

What is the maximum capacitive load supported per switched line?

Each A/B pair supports ≤50 pF load capacitance while maintaining ≤4 ns propagation delay and <1% signal distortion. Exceeding 50 pF increases RC time constant, degrading edge rate and potentially causing timing violations in high-speed interfaces like DDR3 or PCIe Gen2.

Is PI3B16244AEX Pb-free and RoHS compliant?

Yes. The "E" suffix in PI3B16244AEX denotes Pb-free and Green (halogen-free) construction per JEDEC JS709 and RoHS Directive 2011/65/EU. The TSSOP package uses matte tin lead finish and meets IPC/JEDEC J-STD-020 moisture sensitivity level 3.