Nexperia USA Inc. 74AHC595BQ,115

Overview

74AHC595BQ,115 from Nexperia is an 8-bit serial-in/parallel-out shift register with storage latch and 3-state outputs, operating from 2.0 V to 5.5 V supply. It features separate shift clock (SHCP) and storage clock (STCP), asynchronous master reset (MR), and output enable (OE) for bus isolation. Used in LED matrix drivers and microcontroller GPIO expansion where serial-to-parallel conversion and output latching are required.

For engineers reviewing the 74AHC595BQ,115 datasheet, 74AHC595BQ,115 pinout, 74AHC595BQ,115 application, or 74AHC595BQ,115 equivalent, key selection criteria include propagation delay (≤10.5 ns at 5 V), overvoltage-tolerant inputs (to 5.5 V), -40 °C to +125 °C operation, DHVQFN16 package thermal performance, and TTL-compatible alternatives for mixed-voltage system interfacing.

Technical Context

The device implements two independent synchronous registers: an 8-stage shift register accepting serial data on DS and shifting on SHCP rising edges, and a parallel-output storage register loaded on STCP rising edges. Output states are held stable during shifting, enabling glitch-free updates.

Outputs are actively driven high/low when OE is LOW; a HIGH on OE places all eight Q0–Q7 outputs in high-impedance state without affecting internal register contents. MR asynchronously clears only the shift register, leaving storage register unaffected until next STCP pulse.

Key Specifications

Pinout & Package

DHVQFN16 (SOT763-1) package: 2.5 mm × 3.5 mm × 0.85 mm body, 16-terminal leadless quad flat no-lead 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 serial-to-parallel shift register applications.

Compared with 74AHCT595BQ,115, the 74AHC595BQ,115 offers superior noise immunity and wider voltage compatibility but requires stronger input drive; versus SN74HC595PWR, it delivers higher speed, better thermal performance, and robustness in harsh electrical environments.

Availability

74AHC595BQ,115 is available at Aetrix Electronics and suitable for LED display drivers, microcontroller GPIO expansion, industrial I/O modules, and remote control holding registers requiring stable component supply across automotive and industrial temperature ranges.

Supply support for 74AHC595BQ,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 logic, discrete, and MOSFET solutions with focus on efficiency, reliability, and miniaturization.

The 74AHC595BQ,115 belongs to Nexperia's advanced logic family designed for low-power, high-speed serial interface bridging in space-constrained and thermally demanding applications.

FAQ

What is the maximum clock frequency supported by the 74AHC595BQ,115?

The 74AHC595BQ,115 supports up to 90 MHz for both SHCP and STCP inputs at V_CC = 4.5–5.5 V and T_A = -40 °C to +125 °C. This is verified by t_W (minimum pulse width) of 5.0 ns and f_max test data in Table 7 of the official Nexperia datasheet Rev. 9.

Can the 74AHC595BQ,115 be used with a 3.3 V microcontroller driving 5 V LEDs?

Yes - its overvoltage-tolerant inputs accept up to 5.5 V regardless of V_CC, allowing direct connection of 3.3 V GPIO to SHCP/STCP/OE/MR/DS. Its outputs drive up to 8 mA at 5 V, enabling direct 5 V LED anode control when V_CC = 5 V and LEDs are cathode-grounded.

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

MR asynchronously resets only the 8-stage shift register to zero; it has no effect on the storage register contents or Q0–Q7 output states. The storage register retains its last loaded value until updated by a rising edge on STCP, ensuring output stability during shift register clearing.

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

No - the exposed pad (terminal 1 index area) is a mechanical thermal slug with no electrical connection. Nexperia specifies it may remain floating or be connected to GND per PCB layout requirements, but it carries no signal or power function per SOT763-1 mechanical drawing and datasheet footnote.