Nexperia USA Inc. CBT3257APW,118

Overview

CBT3257APW,118 from Nexperia is a quad 1-of-2 bus switch IC operating as a bidirectional analog multiplexer/demultiplexer with active-low output enable (OE), 5 Ω typical ON resistance, <0.25 ns propagation delay, and TTL-level compatible control inputs. It routes four independent A-port signals to either of two B-port terminals per channel in industrial I/O expansion, FPGA configuration routing, and mixed-signal data path switching.

For engineers reviewing the CBT3257APW,118 datasheet, CBT3257APW,118 pinout, CBT3257APW,118 application, or CBT3257APW,118 equivalent, key selection criteria include guaranteed 5 Ω R_ON at 5 V, overvoltage-tolerant control pins up to 5.5 V, -40 °C to +85 °C operation, and TSSOP16 package compatibility with high-density PCB layouts.

Technical Context

The CBT3257A implements four independent SPDT analog switches controlled by a shared select (S) and output enable (OE) input. Each switch operates bidirectionally with no internal logic buffering-signal integrity depends solely on R_ON and parasitic capacitance (C_io(off) = 6.4 pF).

Switching behavior follows strict truth table: OE = LOW enables routing; S = LOW connects nA to nB1, S = HIGH connects nA to nB2; OE = HIGH forces all outputs into high-impedance state regardless of S. No internal level-shifting or voltage translation is performed.

Key Specifications

Pinout & Package

TSSOP16 package (SOT403-1): 4.4 mm body width, 0.65 mm lead pitch, 16-pin surface-mount outline optimized for automated placement and thermal performance in dense layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT3257PW and 74LVC1G3157GW, the CBT3257APW,118 delivers lower R_ON, tighter propagation delay, and superior ESD robustness in a single TSSOP16 footprint-making it optimal for high-integrity, space-constrained industrial signal routing.

Availability

CBT3257APW,118 is available at Aetrix Electronics and suitable for PCIe lane switching, FPGA configuration routing, and industrial I/O expansion requiring stable component supply across extended temperature ranges and high-volume production cycles.

Supply support for CBT3257APW,118 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 leading semiconductor manufacturer specializing in high-performance, high-reliability logic, analog, and discrete components for industrial, automotive, and computing markets.

The CBT3257A belongs to Nexperia's advanced bus switch product line, engineered specifically for low-distortion, high-speed signal routing in mixed-voltage and noise-sensitive embedded systems.

FAQ

What is the maximum allowable voltage on the S and OE pins relative to VCC?

The S and OE control inputs are overvoltage tolerant up to 5.5 V regardless of VCC level, as confirmed in Table 4 (Limiting Values) and Section 2. This allows safe interfacing with 5 V TTL drivers even when VCC is set to 4.5 V, eliminating need for external level shifters in mixed-rail systems.

Can the CBT3257APW,118 be used to switch analog signals such as audio or sensor outputs?

Yes-the device supports bidirectional analog signal routing with 5 Ω typical R_ON, 6.4 pF off-state capacitance, and ±1 μA input leakage. Its rail-to-rail analog passband (limited only by VCC and GND) makes it suitable for DC-coupled audio paths and precision sensor multiplexing below 100 MHz, provided signal swing remains within VCC–GND bounds.

Is there a thermal pad or exposed die attach pad in the TSSOP16 (SOT403-1) package?

No-the SOT403-1 (TSSOP16) package for CBT3257APW,118 does not include an exposed thermal pad. Thermal dissipation relies on copper traces connected to pins 8 (GND) and 16 (VCC). For high-duty-cycle switching, PCB layout should maximize copper area on these pins and use internal ground planes for heat spreading.

Does the CBT3257APW,118 support hot insertion or live swapping of connected peripherals?

Yes-its high-impedance Hi-Z state (when OE = HIGH) and latch-up immunity (>100 mA per JESD78 Class II Level A) enable safe hot insertion. However, signal integrity during plug/unplug depends on system-level ESD protection and slew-rate limiting on connected lines; the device itself provides no built-in hot-swap current limiting.