Renesas 74AC374FP-E

Overview

74AC374FP-E from Renesas is an octal D-type flip-flop with 3-state outputs, designed for bus-oriented digital systems requiring synchronized data latching and controlled output driving. It features a positive-edge-triggered clock (CP), common output enable (OE), individual D0–D7 inputs, and true O0–O7 outputs. At VCC = 5.0 V, it delivers 24 mA output drive, supports 100 MHz maximum clock frequency, and operates across –40°C to +85°C.

For engineers reviewing the 74AC374FP-E datasheet, 74AC374FP-E pinout, 74AC374FP-E application, or 74AC374FP-E equivalent, this page provides verified functional behavior, validated AC/DC specifications at 3.3 V and 5.0 V, package-specific thermal and timing margins, and direct alternatives for bus interface and register design in industrial control and legacy TTL-compatible logic systems.

Technical Context

The 74AC374FP-E implements eight independent edge-triggered D flip-flops sharing a buffered clock (CP) and a buffered 3-state output enable (OE). Its operation is defined by setup/hold time requirements (tsu = 4.0 ns, th = 1.0 ns at 5.0 V), with outputs transitioning on the low-to-high CP edge and entering high-impedance when OE is high.

It uses AC CMOS technology with TTL-compatible input thresholds only in the HD74ACT374 variant - the 74AC374FP-E (AC-series) has CMOS input levels (VIH = 3.85 V min at VCC = 5.5 V). Output drive capability is ±24 mA, and propagation delays are tPLH/tPHL ≤ 9.5 ns (max) at 5.0 V, CL = 50 pF.

Key Specifications

Pinout & Package

SOP-20 pin (JEITA FP-20DAV) package - 12.6 mm × 7.5 mm body, 0.65 mm pitch, Ni/Pd/Au plating, 0.31 g mass, surface-mount compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal D-type latch/register applications.

Compared with 74AC374FP-E, the 74ACT374FP-E offers guaranteed TTL input compatibility at the cost of slightly higher ICC, while SN74AC374PWR provides identical logic performance in a more compact, modern TSSOP package - both require no schematic changes but may need layout adaptation.

Availability

74AC374FP-E is available at Aetrix Electronics and suitable for industrial PLC expansion, legacy bus interface adapters, and embedded data acquisition registers requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for 74AC374FP-E 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

Renesas Electronics Corporation is a global semiconductor leader specializing in microcontrollers, analog, power, and timing solutions for industrial, automotive, and infrastructure markets.

The HD74AC374 series belongs to Renesas' legacy logic portfolio, engineered for reliable, high-speed data latching and bus interface in industrial control, test equipment, and retrofitted computing systems.

FAQ

What is the maximum clock frequency supported by the 74AC374FP-E?

The 74AC374FP-E supports a maximum clock frequency of 100 MHz at VCC = 5.0 V and CL = 50 pF. At 3.3 V operation, the maximum frequency drops to 60 MHz. These values are guaranteed across the full operating temperature range (–40°C to +85°C) and reflect worst-case timing under load, making the 74AC374FP-E suitable for high-speed synchronous bus applications where deterministic edge alignment is critical.

Does the 74AC374FP-E have TTL-compatible inputs?

No, the 74AC374FP-E uses standard CMOS input thresholds (VIH ≥ 3.85 V at VCC = 5.5 V), not TTL-compatible levels. For TTL compatibility, Renesas offers the pin-compatible 74ACT374FP-E variant, which guarantees VIH ≥ 2.0 V and VIL ≤ 0.8 V at 5.0 V - essential when interfacing directly with 74LS or 74F logic families without level-shifting circuitry.

What is the output drive capability of the 74AC374FP-E?

The 74AC374FP-E provides ±24 mA output drive per pin at VCC = 5.0 V, enabling direct interfacing with multiple 74LS loads or termination of short PCB traces without external buffers. This drive strength is maintained across the full operating temperature range and supports robust signal integrity in noisy industrial environments where marginal drive can cause timing violations or logic errors.

How does the Output Enable (OE) pin function in the 74AC374FP-E?

In the 74AC374FP-E, the OE pin is active-low: when OE = L, the stored Q-state appears on O0–O7; when OE = H, all outputs enter high-impedance (Z) state regardless of clock or data activity. Critically, OE has no effect on internal flip-flop states - data remains latched and unchanged, allowing seamless bus arbitration without loss of register contents during contention periods.

What package type is used for the 74AC374FP-E?

The 74AC374FP-E uses the SOP-20 pin JEITA package (FP-20DAV): 12.6 mm × 7.5 mm body, 0.65 mm lead pitch, Ni/Pd/Au plating, and 0.31 g mass. It is a surface-mount device compatible with standard IR reflow profiles and designed for automated assembly in industrial and instrumentation applications where reliability and thermal stability are prioritized over ultra-compact footprints.