Nexperia USA Inc. 74HCT4094PWJ

Overview

74HCT4094PWJ 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 dual serial outputs (QS1/QS2) for daisy-chaining. It operates at 4.5 V to 5.5 V, supports -40 °C to +125 °C ambient, and delivers 25 ns typical propagation delay (CP to QPn @ VCC = 4.5 V). Used in LED matrix drivers and remote control hold registers where cascaded data distribution and output latching are required.

For engineers reviewing the 74HCT4094PWJ datasheet, 74HCT4094PWJ pinout, 74HCT4094PWJ application, or 74HCT4094PWJ equivalent, key selection criteria include TTL-compatible input thresholds (VIH = 2.0 V min), 3-state output enable timing (ten = 35 ns max), QS1/QS2 phase relationship for clock-edge-agnostic cascading, and TSSOP16 thermal derating (8.5 mW/K above 91 °C).

Technical Context

The device implements two independent 8-bit registers: a shift register clocked on CP rising edges and a storage register loaded on STR high. Data advances through the shift register on each CP ↑, with QS1 reflecting stage 6 output on the same edge and QS2 reflecting stage 7 output on the subsequent CP ↓ - enabling robust inter-device synchronization across varying clock slew rates.

Output states are controlled solely by OE: HIGH enables parallel outputs (QP0–QP7) with VOH ≥ 3.98 V / VOL ≤ 0.26 V @ IO = ±4.0 mA; LOW forces all outputs into high-impedance (IOZ ≤ ±5.0 μA). Input clamp diodes allow safe interfacing to voltages beyond VCC when used with current-limiting resistors.

Key Specifications

Pinout & Package

TSSOP16 package (SOT403-1): plastic thin shrink small outline, 16 leads, 4.4 mm body width, 0.65 mm pitch, 1.20 mm max height - optimized for high-density PCB layouts with improved thermal dissipation vs SO16.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC4094PW and SN74LV4094APWR, the 74HCT4094PWJ uniquely provides TTL-compatible inputs for direct 5 V MCU interfacing, dual-phase serial outputs for jitter-tolerant daisy-chaining, and extended temperature qualification - making it optimal for industrial control and automotive subsystems.

Availability

74HCT4094PWJ is available at Aetrix Electronics and suitable for LED matrix drivers, remote control decoder hold registers, and industrial I/O expanders requiring stable component supply across automotive and industrial temperature ranges.

Supply support for 74HCT4094PWJ 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 74HCT series targets industrial and automotive applications requiring robust 5 V logic interoperability, extended temperature operation, and proven ESD resilience - designed specifically for mission-critical control and interface functions.

FAQ

What is the minimum pulse width required on the STR input?

The STR input requires a minimum HIGH pulse width of 20 ns at VCC = 4.5 V to reliably latch data from the shift register into the storage register. This value increases to 24 ns at -40 °C to +125 °C operating extremes, ensuring robust operation in automotive under-hood environments where timing margins are critical.

Can QS1 and QS2 be used simultaneously to drive different downstream devices?

Yes - QS1 and QS2 provide logically identical data with intentional timing offsets: QS1 updates on CP rising edges, QS2 updates on the following CP falling edge. This allows one device to use QS1 for immediate downstream shifting while another uses QS2 for synchronized latching - eliminating race conditions in multi-stage cascades.

How does the 3-state output behavior interact with the storage register?

The OE input controls only output buffer state - it has no effect on the internal storage register or shift register. When OE is LOW, QP0–QP7 enter high-impedance regardless of stored data; when OE returns HIGH, previously latched values appear immediately at outputs without re-latching or delay.

Is the 74HCT4094PWJ compatible with 3.3 V microcontroller SPI interfaces?

No - its TTL-compatible inputs require VIH ≥ 2.0 V, but 3.3 V SPI outputs typically swing 0–3.3 V with VOH ≈ 3.0 V, which meets the threshold. However, the device's VCC must be 4.5–5.5 V, so level-shifting is required on both data and clock lines to avoid overvoltage damage to the MCU's 3.3 V outputs.