Diodes Incorporated PI5C3257QE-1516

Overview

PI5C3257QE-1516 from Diodes Incorporated is a quad 2:1 analog multiplexer/demultiplexer bus switch with three-state outputs, 5 Ω on-resistance, 0.25 ns propagation delay, and 0.2 µA quiescent current. It operates from 4.5 V to 5.5 V and is used in high-speed data routing for notebook I/O buses and memory expansion interfaces.

For engineers reviewing the PI5C3257QE-1516 datasheet, PI5C3257QE-1516 pinout, PI5C3257QE-1516 application, or PI5C3257QE-1516 equivalent, key selection criteria include low on-resistance matching, sub-nanosecond switching timing, TTL-compatible control logic, and QSOP-16 packaging compatibility with legacy 74-series logic layouts.

Technical Context

The PI5C3257QE-1516 implements four independent bidirectional 2:1 analog switches controlled by a shared select (S) and enable (E) input. Each switch exhibits near-zero propagation delay due to its low R_ON–C_OFF time constant (≈0.25 ns with 50 pF load), enabling transparent signal pass-through without added timing skew.

Its CMOS-based control circuitry accepts TTL-level inputs (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V) and delivers rail-to-rail analog switching across the full 0 V to V_CC range. The device draws only 0.1–3.0 µA quiescent supply current and supports hot-swap operation with no ground bounce noise.

Key Specifications

Pinout & Package

PI5C3257QE-1516 is packaged in a 16-pin QSOP (150-mil width), with 1.27 mm pitch, 10.3 mm × 3.9 mm body size, and exposed pad not present. Pin 1 is marked by a beveled corner.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad 2:1 bus switch applications.

Compared with SN74CBT3257PW and 74LVC257PW, PI5C3257QE-1516 delivers superior analog performance (5 Ω R_ON, 0.25 ns t_IY) and lower quiescent power (0.2 µA), making it optimal for high-fidelity, low-latency, battery-sensitive I/O routing where true analog transparency is required.

Availability

PI5C3257QE-1516 is available at Aetrix Electronics and suitable for notebook I/O expansion, PCIe lane multiplexing, and memory interface arbitration requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant manufacturing traceability.

Supply support for PI5C3257QE-1516 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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.

The PI5C3257 belongs to Diodes' Pericom® high-speed analog switch product line, engineered specifically for low-latency, low-power, and low-noise signal routing in portable computing, communications infrastructure, and industrial control systems.

FAQ

Is PI5C3257QE-1516 compatible with 3.3 V logic control signals?

No. The PI5C3257QE-1516 requires V_CC = 4.5–5.5 V and specifies TTL-compatible input thresholds (V_IH ≥ 2.0 V, V_IL ≤ 0.8 V). While 3.3 V logic may meet V_IH, it falls outside the validated operating range and risks marginal switching behavior or increased ICC under temperature variation. Use only with 5 V supply and 5 V-tolerant control sources.

Can PI5C3257QE-1516 switch analog video signals such as VGA or LVDS?

No. The device is rated for DC to 100 MHz small-signal bandwidth and lacks guaranteed performance for video-frequency harmonics or differential signaling. Its 5 Ω R_ON and 6 pF C_IN support USB 2.0 and PCIe Gen1, but VGA (160 MHz+) and LVDS (300+ MHz) exceed its verified analog bandwidth and require dedicated video switches or serializers.

What is the maximum capacitive load supported per channel?

The datasheet validates performance up to 50 pF load capacitance with specified t_IY = 0.25 ns. For loads >50 pF, propagation delay increases linearly with RC time constant (R_ON × C_L). At 100 pF, expected delay is ~0.5 ns; above 200 pF, signal integrity degrades significantly due to rise-time degradation and potential ringing.

Does PI5C3257QE-1516 support hot-swap or live-insertion?

Yes. The device exhibits no ground bounce noise during switching and features rail-to-rail analog pass-through with no DC blocking. Its 0.2 µA quiescent current and absence of internal latches allow safe insertion into powered backplanes, provided V_CC and GND make contact before signal pins and all inputs remain within –0.5 V to V_CC +0.5 V during transition.