NXP Semiconductors 74HCT151DB,112

Overview

74HCT151DB,112 from NXP Semiconductors is a TTL-level-compatible 8-input digital multiplexer in SSOP16 package, featuring complementary outputs (Y and Y), active-low enable (E), and three binary select inputs (S0–S2). It routes one of eight data inputs (I0–I7) to Y/Y based on select logic, with propagation delays as low as 12 ns at 5 V and operation across −40 °C to +125 °C - used in address/data routing, signal selection, and logic-level translation in industrial control systems.

For engineers reviewing the 74HCT151DB,112 datasheet, 74HCT151DB,112 pinout, 74HCT151DB,112 application, or 74HCT151DB,112 equivalent, key selection considerations include TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V), low-power CMOS design (ICC ≤ 160 µA at 125 °C), ESD robustness (HBM > 2000 V), and SSOP16 footprint compatibility with space-constrained PCB layouts.

Technical Context

The 74HCT151DB,112 implements standard 8:1 multiplexer logic with non-inverting data path and active-low enable control. Its TTL-compatible inputs accept 0.8 V/2.0 V thresholds, ensuring interoperability with legacy 5 V logic families while maintaining CMOS power efficiency.

Internal architecture includes clamp diodes on all inputs for overvoltage tolerance, and dual complementary outputs (Y and Y) that guarantee logically inverted states under valid select conditions. Propagation delay is specified from any input (data, select, or enable) to either output, with worst-case tpd = 57 ns at 125 °C and VCC = 4.5 V.

Key Specifications

Pinout & Package

74HCT151DB,112 uses the SOT338-1 package: plastic shrink small outline package, 16 leads, body width 5.3 mm, 0.65 mm lead pitch, and gull-wing surface-mount terminals.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-input multiplexer applications.

Compared with 74HCT151DB,112, the 74HCT151D,118 offers identical functionality in a larger SO16 package for easier hand-soldering and thermal management, while the SN74HCT151DR provides marginally faster typical propagation delay and alternate supply-chain assurance - neither is pin-compatible without footprint revision, but all three share identical logic behavior and interface requirements.

Availability

74HCT151DB,112 is available at Aetrix Electronics and suitable for industrial control systems, legacy bus interfaces, logic-level translation circuits, and automated test equipment requiring stable component supply across extended temperature ranges.

Supply support for 74HCT151DB,112 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

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The 74HCT151DB,112 belongs to NXP's legacy 74HCT logic family, designed specifically to bridge TTL and CMOS logic domains in industrial and commercial systems requiring robust 5 V operation and extended temperature reliability.

FAQ

What is the maximum operating supply voltage for the 74HCT151DB,112?

The 74HCT151DB,112 has an absolute maximum supply voltage (VCC) of +7.0 V, but its recommended operating range is strictly 4.5 V to 5.5 V. Operating outside this range may cause unreliable logic behavior or accelerated device degradation. The 74HCT151DB,112 is not rated for 3.3 V operation - use 74HC151 variants for lower-voltage systems.

Does the 74HCT151DB,112 support hot insertion or live swapping?

No, the 74HCT151DB,112 does not support hot insertion. Its inputs lack powered-off protection circuitry, and applying signals before VCC stabilization risks latch-up or damage due to internal parasitic paths. Always power VCC and GND before applying input signals to ensure safe operation of the 74HCT151DB,112.

Can the 74HCT151DB,112 be used with 3.3 V microcontrollers?

Yes - the 74HCT151DB,112 accepts 3.3 V logic-high signals as valid inputs because its VIH minimum is 2.0 V at VCC = 5 V. However, its outputs swing rail-to-rail (0 V to 5 V), so interfacing with 3.3 V-only receivers requires external level-shifting or series resistors to limit current into 3.3 V inputs. The 74HCT151DB,112 itself remains fully functional in mixed-voltage systems.

What is the purpose of the complementary Y and Y outputs on the 74HCT151DB,112?

The complementary outputs Y and Y provide logically inverted versions of the same selected input signal without requiring external inverters. This reduces component count and propagation delay in applications like bus arbitration, differential signaling, or clock gating where both polarities are needed simultaneously. When E is HIGH, Y is forced LOW and Y is forced HIGH regardless of select inputs - a feature used for fast output disable in the 74HCT151DB,112.

Is the 74HCT151DB,112 pin-compatible with the 74HC151DB,112?

Yes - the 74HCT151DB,112 and 74HC151DB,112 share identical pinout, package (SOT338-1), and functional logic. The only difference is input threshold compatibility: 74HCT151DB,112 accepts TTL-level inputs (VIH ≥ 2.0 V), while 74HC151DB,112 requires CMOS-level inputs (VIH ≥ 3.15 V at VCC = 4.5 V). Substitution is electrically safe if input source logic families match the variant's specification.