Diodes Incorporated 74AHCT595S16-13

Overview

74AHCT595S16-13 from Diodes Incorporated is an 8-bit serial-in, parallel-out shift register with storage register and 3-state outputs, operating at 4.5–5.5 V, supporting 130 MHz max clock frequency, 8 mA output drive, and Schmitt-trigger inputs for noise immunity. It enables microcontroller GPIO expansion in industrial control and peripheral interfaces.

For engineers reviewing the 74AHCT595S16-13 datasheet, 74AHCT595S16-13 pinout, 74AHCT595S16-13 application, or 74AHCT595S16-13 equivalent, key selection criteria include shift/storage clock timing independence, MR reset behavior, OE-controlled 3-state output enable, and SO-16 package compatibility with legacy 74LS595 layouts.

Technical Context

The device implements two synchronized but functionally separate registers: an 8-bit shift register accepting serial data on DS at each SHCP rising edge, and an independent 8-bit storage register loaded on STCP rising edge. MR asynchronously clears only the shift register, leaving storage register contents intact until next STCP pulse.

All inputs feature Schmitt-trigger action (VIH = 2.0 V min, VIL = 0.8 V max), enabling robust operation with slow or noisy signals. Outputs drive ±8 mA at VCC = 4.5 V with VOH ≥ 3.94 V and VOL ≤ 0.36 V, and enter high-impedance state when OE is high.

Key Specifications

Pinout & Package

74AHCT595S16-13 is housed in a 16-pin SOIC (SO-16) package with 1.27 mm pitch, 10.0 mm × 4.0 mm body, and gull-wing leads suitable for reflow soldering and automated assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial-to-parallel shift register applications.

Compared with SN74HC595N and 74LV595PW, the 74AHCT595S16-13 uniquely combines 5 V operation, Schmitt-trigger noise immunity, 130 MHz speed, and SO-16 drop-in compatibility with legacy 74LS595 footprints-making it optimal for industrial upgrades requiring robustness and backward integration.

Availability

74AHCT595S16-13 is available at Aetrix Electronics and suitable for industrial control panels, LED signage controllers, and microcontroller-based test equipment requiring stable component supply and long-term manufacturability.

Supply support for 74AHCT595S16-13 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and integrated circuits, specializing in high-reliability, industry-standard logic and interface solutions.

The 74AHCT595 belongs to Diodes' advanced high-speed CMOS logic family, designed specifically for drop-in replacement of legacy 74LS devices while delivering improved speed, noise immunity, and power efficiency in 5 V systems.

FAQ

What is the function of the MR (Master Reset) pin?

The MR pin is an asynchronous active-low input that clears all bits in the shift register to zero, regardless of clock states. It does not affect the storage register contents, allowing outputs to remain stable during reset. MR must be pulled high during normal operation to avoid unintended clearing.

Can SHCP and STCP be tied together?

Yes, SHCP and STCP can be connected to the same clock source, but doing so causes the shift register to always lead the storage register by one clock cycle. This configuration enables transparent mode operation where serial input appears on Q0 after one clock delay, but eliminates independent control of load timing.

How does Q7S support daisy-chaining?

Q7S outputs the most significant bit shifted out of the internal shift register. When connected to the DS pin of the next 74AHCT595, it allows serial data to propagate across multiple devices. All SHCP and STCP lines are typically wired in parallel, while Q7S→DS forms the daisy-chain data path.

What happens to outputs when OE is high?

When OE is high, all Q0–Q7 outputs enter a high-impedance (Z) state, effectively disconnecting them from the driven circuit. This prevents bus contention in shared-bus configurations and allows multiple 74AHCT595 devices to share the same output lines without external multiplexing.