Nexperia USA Inc. 74AHCT595BQ,115

Overview

74AHCT595BQ,115 from Nexperia is an 8-bit serial-in/parallel-out shift register with storage latch and 3-state outputs, operating at 4.5 V to 5.5 V supply. It features separate shift clock (SHCP) and storage clock (STCP), asynchronous master reset (MR), and TTL-compatible inputs. Used in LED matrix drivers and microcontroller GPIO expansion where serial-to-parallel conversion and output latching are required.

For engineers reviewing the 74AHCT595BQ,115 datasheet, 74AHCT595BQ,115 pinout, 74AHCT595BQ,115 application, or 74AHCT595BQ,115 equivalent, key selection criteria include propagation delay (≤10.5 ns @ 5 V, CL=50 pF), 3-state output enable timing (ten ≤13.0 ns), -40 °C to +125 °C operation, DHVQFN16 package thermal performance, and TTL-level input compatibility.

Technical Context

The device implements two cascaded 8-bit registers: a shift register accepting serial data on DS with rising-edge-triggered SHCP, and a storage register loaded on rising-edge STCP. Outputs Q0–Q7 reflect storage register contents only when OE is LOW; MR asynchronously clears the shift register but not the storage register.

Its TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V at VCC = 4.5–5.5 V) ensure interoperability with legacy 5 V logic families, while overvoltage-tolerant inputs (up to 5.5 V) support mixed-voltage system interfacing without level shifters.

Key Specifications

Pinout & Package

DHVQFN16 package (SOT763-1): 2.5 × 3.5 × 0.85 mm body, 16-terminal leadless construction with exposed thermal pad; optimized for high-density PCB layouts and improved thermal dissipation vs. SO16/TSSOP.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit serial-in/parallel-out shift register applications.

Compared with 74AHC595BQ,115 and SN74HC595PWR, the 74AHCT595BQ,115 uniquely combines TTL input compatibility, 125 °C operation, overvoltage tolerance, and DHVQFN thermal performance-making it optimal for automotive and industrial environments where signal integrity and reliability are non-negotiable.

Availability

74AHCT595BQ,115 is available at Aetrix Electronics and suitable for LED display drivers, microcontroller GPIO expansion, industrial I/O modules, and automotive body control units requiring stable component supply across extended temperature ranges.

Supply support for 74AHCT595BQ,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 components for automotive, industrial, and consumer applications, with leadership in logic, discrete, and MOSFET technologies.

The 74AHCT595 belongs to Nexperia's advanced logic family designed specifically for robust, low-power, high-speed serial-to-parallel data conversion in harsh-environment applications.

FAQ

What is the maximum clock frequency supported by the 74AHCT595BQ,115?

The device supports a maximum shift/storage clock frequency of 90 MHz at VCC = 5.5 V and -40 °C to +125 °C ambient, verified by t_W (minimum pulse width) of 5.0 ns and f_max test data in the datasheet. This rating applies separately to SHCP and STCP inputs, enabling independent high-speed serial loading and latch updating.

Can the 74AHCT595BQ,115 be used with a 3.3 V microcontroller SPI interface?

No-its TTL-compatible inputs require VIH ≥ 2.0 V, but 3.3 V logic typically delivers only ~2.4 V HIGH under load, risking marginal switching. For reliable 3.3 V SPI use, select the 74AHC595BQ,115 variant (CMOS inputs, VIH ≥ 3.85 V @ 5.5 V) or add a level shifter to ensure VIH compliance.

How does the MR (master reset) pin interact with the storage register?

MR asynchronously resets only the 8-bit shift register to zero; it has no effect on the storage register or Q0–Q7 outputs. The stored parallel data remains unchanged until the next STCP rising edge, enabling safe reset of serial input pipeline without disrupting active outputs.

Is the exposed thermal pad on the DHVQFN16 package electrically connected?

Yes-the exposed pad (Pin 1) is internally connected to GND and must be soldered to a PCB copper pour tied to the system ground plane. This connection is mandatory for both thermal performance (derating starts above 106 °C) and electrical noise suppression per Nexperia's SOT763-1 mechanical specification.