STMicroelectronics 74VHCT74AMTR

Overview

74VHCT74AMTR from STMicroelectronics is a dual D-type flip-flop with asynchronous preset and clear, designed for high-speed 5V logic interfacing. It features 160 MHz max clock frequency (typ.), 8 mA output drive, TTL-compatible inputs (VIH ≥ 2 V, VIL ≤ 0.8 V), and operates from 4.5 V to 5.5 V. Used in clock-synchronized data latching and state-holding circuits in industrial control and digital instrumentation.

For engineers reviewing the 74VHCT74AMTR datasheet, 74VHCT74AMTR pinout, 74VHCT74AMTR application, or 74VHCT74AMTR equivalent, key selection criteria include propagation delay symmetry (tPLH ≅ tPHL), power-down input/output protection, ±2 kV ESD immunity, and compatibility with legacy 74-series logic families.

Technical Context

This device implements two independent edge-triggered D flip-flops, each with separate asynchronous active-low preset (PR) and clear (CLR) inputs that override clock and data. The positive-edge-triggered clock (CK) transfers D-input state to Q/Q̅ outputs without dependency on clock duty cycle.

It uses sub-micron C2MOS technology to achieve low ICC (2 µA max at 25°C) while maintaining robust DC specs: VOH ≥ 3.94 V at IO = –8 mA, VOL ≤ 0.55 V at IO = 8 mA, and input tolerance up to 7 V regardless of VCC - enabling safe 5 V ↔ 3 V interface operation.

Key Specifications

Pinout & Package

74VHCT74AMTR is housed in a 14-lead SOIC (Small Outline Integrated Circuit) package with tape-and-reel delivery (MTR suffix). Dimensions conform to JEDEC MS-012, body width 3.9 mm, lead pitch 1.27 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74VHC74DR and MC74VHC74DT, the 74VHCT74AMTR uniquely combines 7 V input tolerance, 160 MHz speed, and JESD78 Class II latch-up immunity - making it optimal for industrial and automotive upgrades where reliability under electrical stress is non-negotiable.

Availability

74VHCT74AMTR is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, and legacy system upgrades requiring stable component supply and long-term manufacturability.

Supply support for 74VHCT74AMTR 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power discrete solutions with vertical manufacturing capability.

The 74VHCT series targets high-speed, low-power 5 V CMOS logic replacement for legacy TTL systems - emphasizing interoperability, robustness, and extended temperature performance in mission-critical embedded control.

FAQ

What is the maximum clock frequency supported by the 74VHCT74AMTR?

The 74VHCT74AMTR achieves a typical maximum clock frequency of 160 MHz at VCC = 5.0 V and CL = 15 pF, with guaranteed minimum of 100 MHz over the full industrial temperature range (–40°C to +85°C) and 80 MHz at extended temperature (–55°C to +125°C). This is verified under AC test conditions with 3 ns input rise/fall times.

Can the 74VHCT74AMTR safely interface between 5 V and 3.3 V logic domains?

Yes - its TTL-compatible inputs accept VIH ≥ 2.0 V and VIL ≤ 0.8 V, allowing direct connection to 3.3 V CMOS outputs. Additionally, input pins tolerate up to 7 V regardless of VCC, preventing damage during voltage sequencing or hot-plug events. Outputs swing rail-to-rail (0 V to VCC), so level-shifting may be needed for 3.3 V receiver inputs.

Does the 74VHCT74AMTR support asynchronous set and reset functions?

Yes - each flip-flop has dedicated active-low asynchronous preset (PR) and clear (CLR) inputs that operate independently of the clock signal. When PR is low, Q goes high and Q̅ goes low; when CLR is low, Q goes low and Q̅ goes high. Both functions take priority over clocked data transfer and are specified with 5 ns minimum pulse width.

What package type does the 'MTR' suffix indicate for this part?

The 'MTR' suffix denotes tape-and-reel packaging in the standard 14-lead SOIC (Small Outline IC) outline, per JEDEC MS-012. Dimensions are 8.75 mm × 4.0 mm × 1.65 mm (length × width × height), with 1.27 mm lead pitch and gull-wing leads. This format supports automated SMT placement and is RoHS-compliant.