Nexperia USA Inc. 74HC273BQ,115

Overview

74HC273BQ,115 from Nexperia is an octal positive-edge-triggered D-type flip-flop with asynchronous master reset (MR), designed for synchronous data latching in digital logic systems. It operates across 2.0 V to 6.0 V supply, delivers 8-bit parallel storage, supports -40 °C to +125 °C industrial temperature range, and features CMOS-level inputs. It is used in microcontroller I/O expansion, address/data bus registration, and clock-synchronized control logic.

For engineers reviewing the 74HC273BQ,115 datasheet, 74HC273BQ,115 pinout, 74HC273BQ,115 application, or 74HC273BQ,115 equivalent, this page provides verified functional identity, DHVQFN20 package mapping, timing parameters (tpd = 15 ns @ 4.5 V), reset behavior (asynchronous active-low MR), and validated alternatives for logic-level-compatible octal DFF replacement.

Technical Context

The 74HC273BQ,115 implements eight independent D-type flip-flops sharing a common clock (CP) and master reset (MR) input. Each flip-flop captures the state of its Dn input on the LOW-to-HIGH transition of CP, provided setup (tsu = 12 ns @ 4.5 V) and hold (th = 3 ns) timing requirements are met.

MR overrides clock and data: a LOW on MR forces all Qn outputs LOW regardless of CP or Dn states. Inputs include clamp diodes enabling safe interfacing to voltages exceeding VCC when current-limiting resistors are used.

Key Specifications

Pinout & Package

DHVQFN20 (SOT764-1) package: 2.5 × 4.5 × 0.85 mm body, 20-terminal quad flat no-lead format with exposed thermal pad (non-soldered by default); optimized for high-density PCB layouts and thermal performance in space-constrained applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal D-type flip-flop with reset applications.

Compared with 74HCT273BQ,115, the 74HC273BQ offers higher noise margins in mixed-signal environments but requires CMOS-compliant drive strength; versus SN74HC273PWR, it delivers superior thermal performance and 30% smaller PCB area at the cost of rework complexity.

Availability

74HC273BQ,115 is available at Aetrix Electronics and suitable for microcontroller I/O expansion, address bus latching, and industrial control register applications requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 74HC273BQ,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 focused on essential efficiency technologies, delivering high-performance logic, analog, and discrete components with rigorous automotive and industrial qualification.

The 74HC273BQ belongs to Nexperia's 74HC logic family, engineered for low-power, high-noise-immunity digital interfacing in industrial automation, consumer electronics, and communication infrastructure.

FAQ

What is the maximum clock frequency supported by the 74HC273BQ,115?

The 74HC273BQ,115 supports a maximum clock frequency of 30 MHz at VCC = 4.5 V and CL = 50 pF, based on its typical propagation delay (tpd = 15 ns) and setup/hold timing constraints. At VCC = 6.0 V, fmax increases to 35 MHz, while operation at 2.0 V limits fmax to 6 MHz due to slower switching characteristics.

Can the MR (master reset) pin be left unconnected?

No - the MR pin must be actively driven HIGH (via pull-up resistor or logic signal) when not in use, as it is active LOW and internally uncommitted. Leaving MR floating risks unintended reset assertion due to noise or leakage, causing unpredictable Qn output states. A 10 kΩ pull-up to VCC is recommended for robust operation.

Does the DHVQFN20 package require soldering of the exposed thermal pad?

No - the exposed pad (terminal 1 index area) has no electrical or mechanical requirement to be soldered. If soldered, it must remain electrically floating or be connected to GND; improper connection (e.g., to VCC or signal nets) may cause malfunction or damage. Most designs omit soldering unless thermal dissipation exceeds 100 mW.

How does the 74HC273BQ,115 differ from the 74HC574 in system design?

The 74HC273BQ,115 uses a single shared clock and master reset for all eight flip-flops, enabling synchronous global update; the 74HC574 employs a 3-state output buffer with separate output-enable (OE) control, allowing bus-sharing capability. Use 74HC273BQ for pure latching without bus contention; choose 74HC574 when driving shared data buses or requiring tri-state isolation.