Nexperia USA Inc. 74CB3Q3257PWJ

Overview

74CB3Q3257PWJ from Nexperia is a quad 4-bit 1-of-2 FET bus switch with integrated charge pump, functioning as a high-bandwidth analog multiplexer/demultiplexer in signal routing and bus isolation paths. It operates from 2.3 V to 3.6 V, delivers 4 Ω typical ON resistance, supports 0–5 V signal switching at VCC = 3.3 V, and enables 20 MHz maximum switching frequency in communication infrastructure and memory interleaving systems.

For engineers reviewing the 74CB3Q3257PWJ datasheet, 74CB3Q3257PWJ pinout, 74CB3Q3257PWJ application, or 74CB3Q3257PWJ equivalent, key selection criteria include overvoltage switching capability (0–5 V with 3.3 V supply), low 3.5 pF OFF-state capacitance for minimal signal distortion, IOFF partial power-down support, and TSSOP16 package compatibility with high-density PCB layouts.

Technical Context

The device implements four independent SPDT NMOS FET switches, each controlled by a shared select input (S) and active-low output enable (OE). An internal charge pump boosts gate drive voltage above VCC to maintain low and flat RON across the full 0–5 V signal range, enabling bidirectional 5 V signal handling even when powered at 3.3 V.

Switching behavior follows a synchronous function table: when OE is LOW, S = LOW connects nA to nB1; S = HIGH connects nA to nB2; OE = HIGH forces all channels into high-impedance OFF state. Propagation delays are ≤5.5 ns (VCC = 3.0–3.6 V), and disable/enable times are ≤6.0 ns under same conditions.

Key Specifications

Pinout & Package

TSSOP16 (SOT403-1) package: plastic thin shrink small outline, 16-pin, 4.4 mm body width, 0.65 mm lead pitch, surface-mount compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar FET bus switch applications.

Compared with SN74CBT3257PWR and 74LVC1G3157GW, the 74CB3Q3257PWJ uniquely delivers quad-channel 0–5 V switching at 3.3 V supply via integrated charge pump-enabling simplified mixed-voltage routing without added components or layout area.

Availability

74CB3Q3257PWJ is available at Aetrix Electronics and suitable for communication infrastructure, bus isolation, memory interleaving, and sensor multiplexing requiring stable component supply across industrial temperature ranges (−40 °C to +85 °C).

Supply support for 74CB3Q3257PWJ 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

Nexperia is a global semiconductor expert focused on essential efficiency technologies, delivering high-performance logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.

The 74CB3Q3257 belongs to Nexperia's CB3Q advanced bus switch family, engineered for high-bandwidth, low-distortion signal routing in mixed-voltage digital systems with stringent power and space constraints.

FAQ

What is the maximum signal voltage the 74CB3Q3257PWJ can switch when powered at 3.3 V?

The 74CB3Q3257PWJ supports 0 V to 5 V signal switching with VCC = 3.3 V due to its integrated charge pump, which elevates the NMOS gate voltage above VCC to ensure full enhancement across the entire signal range. This eliminates the need for external level-shifting circuitry in mixed-voltage interfaces.

Does the 74CB3Q3257PWJ support partial power-down mode?

Yes, it supports partial power-down via IOFF functionality: when VCC = 0 V, leakage current per pin remains within ±1 μA even with 0–5.5 V applied to switch terminals. This prevents current backflow and protects live system sections during subsystem power gating.

How does the charge pump affect RON flatness across the signal range?

The charge pump maintains strong NMOS gate overdrive across 0–5 V input voltages, resulting in RON(flat) performance - variation stays within ±0.5 Ω over the full signal swing at VCC = 3.3 V. This ensures consistent signal attenuation and timing predictability in precision analog or high-speed digital routing.

Can the 74CB3Q3257PWJ be used with 5 V TTL control inputs?

Yes - its control inputs (S and OE) accept TTL-level signals: VIH ≥2.0 V and VIL ≤0.8 V at VCC = 3.3 V, fully compatible with standard 5 V TTL outputs. No external pull-up resistors or level shifters are required for interfacing with legacy logic families.