Texas Instruments SN74F174ADRE4

Overview

SN74F174ADRE4 from Texas Instruments is a hex D-type positive-edge-triggered flip-flop with asynchronous clear, implemented in F-series TTL logic. It features six independent D-flip-flops, buffered clock and clear inputs, single-rail outputs, and operates over 0°C to 70°C at VCC = 4.5–5.5 V. It is used in buffer/storage registers and pattern generators where synchronous data latching with reset control is required.

For engineers reviewing the SN74F174ADRE4 datasheet, SN74F174ADRE4 pinout, SN74F174ADRE4 application, or SN74F174ADRE4 equivalent, key selection criteria include its 80 MHz max clock frequency, 20 mA low-level output drive, 4.5 ns typical tPLH propagation delay, TTL-compatible input thresholds, and SOIC-16 package compatibility with industrial board layouts.

Technical Context

The SN74F174ADRE4 implements six identical edge-triggered D-flip-flops sharing a common clock (CLK) and asynchronous clear (CLR) input. Each flip-flop transfers data from its D input to Q output on the positive-going edge of CLK, provided setup (4.5 ns) and hold (0.5–1 ns) timing requirements are met.

It uses standard bipolar TTL circuitry with fully buffered inputs and outputs, enabling high noise immunity and stable operation under load. The device supports fan-out of 10 LS-TTL loads and exhibits guaranteed VOH ≥ 2.5 V and VOL ≤ 0.5 V at IOL = 20 mA, meeting legacy TTL interface standards.

Key Specifications

Pinout & Package

SN74F174ADRE4 is housed in a 16-pin SOIC (D) package with 1.27 mm pitch, JEDEC MS-012AC compliant, and RoHS-compliant NiPdAu lead finish. It is moisture sensitivity level 1 (unlimited floor life at ≤30°C/60% RH).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar D-type flip-flop applications.

Compared with SN74LS174N and SN74ACT174DR, the SN74F174ADRE4 delivers superior speed and drive strength within the F-TTL family but requires stricter 5 V regulation and offers no 3.3 V compatibility - making it optimal for performance-critical, legacy-5V-only register applications.

Availability

SN74F174ADRE4 is available at Aetrix Electronics and suitable for buffer/register design, pattern generation, shift register staging, and synchronous state capture requiring stable component supply and long-term industrial availability.

Supply support for SN74F174ADRE4 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

Texas Instruments is a U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic solutions with broad industrial and automotive reach.

The SN74F174ADRE4 belongs to TI's 74F logic family, designed specifically to deliver high-speed, robust TTL-compatible register functionality for commercial-grade digital systems requiring deterministic timing and proven reliability.

FAQ

What is the maximum operating frequency of the SN74F174ADRE4?

The SN74F174ADRE4 supports a maximum clock frequency of 80 MHz across its full operating temperature range (0°C to 70°C). This rating is verified under VCC = 4.5 V to 5.5 V and CL = 50 pF loading conditions. At 25°C and VCC = 5 V, the device can achieve up to 100 MHz, but system-level timing must be validated against worst-case parameters including tPLH/tPHL variation and setup/hold margins. The SN74F174ADRE4 datasheet specifies 80 MHz as the guaranteed maximum for industrial use.

Does the SN74F174ADRE4 support 3.3 V logic interfaces?

No, the SN74F174ADRE4 does not support 3.3 V logic interfaces. It is a 5 V-only TTL device with specified VCC range of 4.5 V to 5.5 V and input thresholds (VIH = 2 V, VIL = 0.8 V) optimized for 5 V operation. Driving its inputs from 3.3 V sources may result in marginal or non-functional VIH compliance, and its outputs swing to ~3.4 V (VOH min = 2.5 V), which may not meet 3.3 V receiver thresholds. For mixed-voltage systems, level translation or a 3.3 V-compatible alternative like SN74ACT174DR is required.

What is the function of Pin 1 (CLR) on the SN74F174ADRE4?

Pin 1 of the SN74F174ADRE4 is the asynchronous clear (CLR) input, active low. When asserted (logic low), it forces all six Q outputs (Q1–Q6) to logic low immediately, regardless of clock state or timing. This function operates independently of the clock edge and overrides any data present at the D inputs. The SN74F174ADRE4 requires CLR to be held low for a minimum of 5 ns to ensure reliable reset, and it must return high for at least 5 ns before the next clock edge to avoid metastability during recovery.

Can the SN74F174ADRE4 be used in place of the SN74LS174?

The SN74F174ADRE4 is not a drop-in replacement for the SN74LS174 due to differences in speed, drive strength, and power consumption. While both share identical pinout and basic functionality, the SN74F174ADRE4 offers higher speed (80 MHz vs. 30 MHz), tighter timing (4.5 ns setup vs. 20 ns), and stronger output drive (20 mA vs. 8 mA), but draws significantly more current (ICCL up to 55 mA vs. ~24 mA). System-level validation of timing margins, power delivery, and signal integrity is required before substitution. The SN74F174ADRE4 datasheet does not claim pin compatibility with LS-series beyond mechanical footprint.

What package type is used for the SN74F174ADRE4?

The SN74F174ADRE4 is supplied in a 16-pin SOIC (Small Outline Integrated Circuit) package, designated as package code 'D' by Texas Instruments. It measures 9.9 mm × 3.91 mm with 1.27 mm lead pitch, is RoHS-compliant with NiPdAu lead finish, and rated MSL Level-1 (unlimited floor life). This tape-and-reel format (2500 units per reel) is optimized for automated SMT assembly and matches industry-standard SOIC-16 footprints used in commercial and industrial PCB designs.