Nexperia USA Inc. 74HC4094D,653

Overview

74HC4094D,653 from Nexperia is an 8-bit serial-in/parallel-out shift-and-store bus register with separate shift and storage clocks, 3-state outputs, and cascading capability via QS1/QS2 serial outputs. It operates at 2.0–6.0 V, supports -40 °C to +125 °C, and delivers 39 ns typical propagation delay (VCC = 4.5 V, CL = 50 pF), enabling reliable serial-to-parallel data conversion in LED matrix drivers and industrial I/O expanders.

For engineers reviewing the 74HC4094D,653 datasheet, 74HC4094D,653 pinout, 74HC4094D,653 application, or 74HC4094D,653 equivalent, key selection criteria include its dual-clock architecture (CP for shifting, STR for latching), TTL-compatible input thresholds (74HCT variant), 3-state output control via OE, and SO16 package compatibility with standard PCB footprints.

Technical Context

The device implements a two-stage pipeline: an 8-bit shift register accepting serial data on CP rising edges, and an independent 8-bit storage latch triggered by STR high. Data appears at QS1 on the same CP rising edge and at QS2 on the subsequent CP falling edge-enabling flexible cascading under varying clock edge rates.

Its 3-state parallel outputs (QP0–QP7) are enabled only when OE is HIGH; OE LOW forces high-impedance states without affecting internal register contents. Input clamp diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors.

Key Specifications

Pinout & Package

74HC4094D,653 uses the SO16 (SOT109-1) plastic small outline package: 16-pin, 3.9 mm body width, 1.27 mm lead pitch, surface-mount compatible with IPC-7351B footprint.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit shift-and-store register applications.

Compared with 74HCT4094D,653, the HC variant offers lower input threshold sensitivity but higher noise immunity at low VCC; versus SN74HC595DR, the 74HC4094D,653 provides superior timing flexibility for daisy-chained systems due to its QS1/QS2 dual-output architecture and independent strobe control.

Availability

74HC4094D,653 is available at Aetrix Electronics and suitable for LED matrix drivers, industrial I/O expanders, remote control holding registers, and test fixture sequencers requiring stable component supply across automotive and industrial temperature ranges.

Supply support for 74HC4094D,653 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, analog, and MOSFET solutions with focus on efficiency, reliability, and sustainability.

The 74HC4094 belongs to Nexperia's 74HC logic family - designed for low-power, wide-supply serial interface expansion in space-constrained industrial and automotive control systems.

FAQ

What is the maximum clock frequency supported by 74HC4094D,653?

The device supports up to 24 MHz maximum clock frequency (fmax) at VCC = 4.5 V and CL = 50 pF, verified by propagation delay measurements (tpd ≤ 39 ns). At VCC = 6.0 V, fmax reaches 28 MHz. These values assume proper PCB layout, decoupling, and load capacitance within specification limits.

How does QS1 differ from QS2 in cascading operation?

QS1 outputs data on the same LOW-to-HIGH CP transition that shifts it into the final stage, enabling fast-clocked cascades. QS2 outputs the identical data on the subsequent HIGH-to-LOW CP transition, accommodating slower clock edges or providing phase-aligned data to downstream devices without added delay compensation.

Can OE be toggled while CP or STR are active?

Yes - OE controls only output buffer state and has no effect on internal shift or storage registers. Outputs enter high-impedance immediately upon OE going LOW, regardless of CP/STR activity, allowing dynamic bus sharing without disrupting ongoing serial data transfer or latching sequences.

Is 74HC4094D,653 pin-compatible with 74HC595?

No - 74HC4094D,653 uses a 16-pin SO package with dedicated STR, QS1, and QS2 pins, while 74HC595 uses an 8-pin SO package with different pin assignments (e.g., Q7S instead of QS2, no separate STR). Direct replacement requires PCB redesign and firmware adaptation to accommodate dual-clock timing.