Nexperia USA Inc. 74HC27BQ,115

Overview

74HC27BQ,115 from Nexperia is a triple 3-input NOR gate logic IC in DHVQFN14 package, operating from 2.0 V to 6.0 V supply, with propagation delay as low as 8 ns at VCC = 6.0 V and CL = 15 pF, CMOS-level input compatibility, and guaranteed operation from –40 °C to +125 °C - used for combinational logic synthesis in industrial control sequencers and power management state machines.

For engineers reviewing the 74HC27BQ,115 datasheet, 74HC27BQ,115 pinout, 74HC27BQ,115 application, or 74HC27BQ,115 equivalent, key selection criteria include input voltage thresholds (VIH = 4.2 V min at VCC = 6.0 V), output drive strength (IO = ±4.0 mA), thermal-enhanced QFN packaging, and TTL-compatible alternative 74HCT27BQ,115 for mixed-logic interfacing.

Technical Context

This device implements three independent 3-input NOR gates with clamp diodes on all inputs, enabling safe interface to voltages exceeding VCC when used with current-limiting resistors. Each gate exhibits identical logic behavior defined by the function table: output is HIGH only when all three inputs are LOW.

It operates within two distinct logic families: 74HC27BQ uses CMOS-level inputs (VIH ≥ 0.7×VCC), while its pin-compatible variant 74HCT27BQ accepts TTL-level inputs (VIH ≥ 2.0 V). Both share identical pinout, package, temperature range, and dynamic performance specifications.

Key Specifications

Pinout & Package

DHVQFN14 (SOT762-1) package: 2.5 × 3.0 × 0.85 mm body, no leads, exposed thermal pad (terminal 1 index area), 14 terminals, lead-free and RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar triple 3-input NOR gate applications.

Compared with 74HC27BQ,115, the 74HCT27BQ,115 offers seamless TTL interfacing but sacrifices CMOS input noise margin, while SN74LVC1G10DBVR trades integration density and thermal performance for ultra-compact size - making the 74HC27BQ optimal for multi-gate, thermally demanding, and purely CMOS-based systems.

Availability

74HC27BQ,115 is available at Aetrix Electronics and suitable for industrial automation controllers, automotive body electronics, and medical device logic modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HC27BQ,115 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 delivering high-performance, reliable logic, discrete, and MOSFET solutions with leadership in efficiency, miniaturization, and quality for industrial and automotive markets.

The 74HC27BQ,115 belongs to Nexperia's 74HC logic family - engineered for low-power, high-noise-immunity combinational logic in harsh-environment applications where reliability and wide VCC tolerance are mandatory.

FAQ

What is the maximum allowable input voltage for 74HC27BQ,115 when VCC = 5.0 V?

The absolute maximum input voltage is VCC + 0.5 V = 5.5 V, per Table 4 limiting values. Inputs include clamp diodes, so voltages up to this level are permissible when series current-limiting resistors restrict IIK to ±20 mA. Exceeding 5.5 V risks permanent damage.

Can 74HC27BQ,115 drive a 50 pF capacitive load at 10 MHz without signal degradation?

Yes: at VCC = 4.5 V and CL = 50 pF, typical propagation delay remains ≤23 ns (Table 7), and transition time stays ≤22 ns. The 24 pF CPD value confirms low dynamic power draw - total dynamic power is ~1.1 mW at 10 MHz, well within the 500 mW package limit.

Is the exposed thermal pad on the DHVQFN14 package electrically connected?

No - the thermal pad (terminal 1 index area) has no electrical connection. Per datasheet section 5.1, it may be left floating or soldered to GND for thermal improvement, but must never be tied to VCC or any other voltage. No internal bond wires attach to it.

How does 74HC27BQ,115 behave when one input is HIGH and the other two are undefined (open)?

Open CMOS inputs float toward VCC due to internal leakage, causing unpredictable output states and increased ICC. The datasheet mandates defined logic levels on all inputs. Use pull-down resistors (≤10 kΩ) to ensure LOW or pull-up to VCC for HIGH - never leave inputs unconnected.