NXP Semiconductors CBTD3861DK,118

Overview

CBTD3861DK,118 from Nexperia is a 10-bit bidirectional TTL-compatible bus switch with integrated 5 V to 3.3 V level shifting, 5 Ω typical ON resistance, active-low output enable (OE), and operation across -40 °C to +85 °C. It enables low-latency data routing between mixed-voltage domains in memory expansion and peripheral interface subsystems.

For engineers reviewing the CBTD3861DK,118 datasheet, CBTD3861DK,118 pinout, CBTD3861DK,118 application, or CBTD3861DK,118 equivalent, key selection criteria include its 0.25 ns max propagation delay, 5 Ω switch resistance, OE-controlled high-impedance isolation, and dual-package availability for layout flexibility in space-constrained embedded systems.

Technical Context

The CBTD3861DK,118 implements a passive FET-based analog switch architecture without internal logic or latching-signal integrity depends solely on R_ON and parasitic capacitance. Its OE input directly controls all ten A/B channel pairs simultaneously, enabling synchronous bus gating in multi-drop configurations.

It supports bidirectional signal flow with no direction pin: voltage polarity at either port determines current direction, and pass voltage remains within 50 mV of input under 12 mA load. The device requires no external biasing and operates with TTL-level control inputs while interfacing 5 V and 3.3 V logic rails.

Key Specifications

Pinout & Package

CBTD3861DK,118 is supplied in SOT556-1: plastic dual in-line compatible very thin quad flat package (DHVQFN) with 24 terminals, 3.5 × 5.5 × 0.85 mm body, and exposed thermal pad (non-electrical, optional GND connection).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT3384APW and 74LVC4245APW, the CBTD3861DK,118 uniquely combines industrial temperature range, integrated level-shifting diodes, and sub-nanosecond delay in a single passive switch-making it the only option for high-reliability, timing-critical mixed-voltage bus interconnects without direction logic.

Availability

CBTD3861DK,118 is available at Aetrix Electronics and suitable for memory expansion interfaces, peripheral bus isolation, FPGA I/O adaptation, and legacy system bus bridging requiring stable component supply and guaranteed long-term industrial temperature support.

Supply support for CBTD3861DK,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 global semiconductor expert specializing in high-performance, high-reliability logic, discrete, and MOSFET solutions for automotive, industrial, and consumer markets.

The CBTD3861DK,118 belongs to Nexperia's advanced bus switch product line, engineered specifically for low-latency, mixed-voltage signal routing in space- and power-constrained embedded systems where timing integrity and thermal robustness are critical.

FAQ

What is the maximum continuous current rating per channel for CBTD3861DK,118?

The CBTD3861DK,118 supports ±128 mA maximum output current per channel under limiting conditions, but its recommended operating current is ≤12 mA to maintain R_ON below 7 Ω and pass voltage within 50 mV. Exceeding 12 mA increases conduction loss and thermal stress, potentially degrading timing performance in high-frequency bus applications using CBTD3861DK,118.

Does CBTD3861DK,118 require external pull-up or pull-down resistors on the OE pin?

No-CBTD3861DK,118 has TTL-compatible input thresholds (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V) and negligible input leakage (±1 μA), so OE can be driven directly from microcontroller GPIO or FPGA I/O without external biasing. Pull resistors are unnecessary unless the driving source floats during reset or power sequencing, in which case a 10 kΩ pull-down ensures default OFF-state for CBTD3861DK,118.

Can CBTD3861DK,118 be used for 3.3 V to 5 V level shifting in reverse direction?

Yes-CBTD3861DK,118 is fully bidirectional: applying 3.3 V to port B and 5 V to port A yields identical R_ON and timing performance. Its internal clamp diodes protect both sides, allowing safe reverse-level shifting without signal inversion or added components. This bidirectional capability is intrinsic to CBTD3861DK,118's passive switch architecture.

Is the exposed thermal pad on CBTD3861DK,118's DHVQFN package electrically connected?

No-the exposed pad on CBTD3861DK,118 (SOT556-1) is a mechanical die attach land with no electrical connection. Nexperia specifies it may remain floating or be connected to GND for improved thermal dissipation, but soldering it to GND is optional and introduces no electrical functionality. PCB layout must treat it as a non-functional thermal slug for CBTD3861DK,118.

What is the typical pass voltage of CBTD3861DK,118 at 12 mA load and 5 V supply?

At V_CC = 5 V and I_SW = 12 mA, the typical pass voltage (V_pass) of CBTD3861DK,118 is 35 mV, measured as the voltage difference between A and B ports. This low value results directly from its 5 Ω typical R_ON and confirms minimal signal attenuation-critical for maintaining noise margins in high-speed parallel buses using CBTD3861DK,118.