Texas Instruments SN74BCT374DWRG4

Overview

SN74BCT374DWRG4 from Texas Instruments is an octal edge-triggered D-type latch with 3-state outputs, designed for bus interfacing and register storage in 5-V TTL-compatible systems. It features a shared rising-edge clock (CLK), active-low output enable (OE), 4.5 V to 5.5 V supply operation, 70 MHz maximum clock frequency, and ±128 mA low-state output drive capability.

For engineers reviewing the SN74BCT374DWRG4 datasheet, SN74BCT374DWRG4 pinout, SN74BCT374DWRG4 application, or SN74BCT374DWRG4 equivalent, key selection criteria include its BiCMOS output architecture, 3-state bus-driving capability, guaranteed setup/hold timing (6.5 ns / 0 ns), thermal performance in SOIC-20 (R_θJA = 73.4°C/W), and compatibility with legacy TTL and CMOS logic families.

Technical Context

The SN74BCT374DWRG4 implements eight independent D-type latches sharing one clock input and one output-enable control line. Its BiCMOS output stage delivers bipolar-level drive strength while maintaining CMOS-compatible input thresholds (V_IL = 0.8 V, V_IH = 2.0 V) and low static current (I_CCZ ≤ 8 mA).

Operation is strictly synchronous on the rising edge of CLK; OE controls output impedance independently-asserting OE low enables normal high/low logic states, while OE high places all Q outputs in high-impedance mode without affecting internal latch state retention or data loading capability.

Key Specifications

Pinout & Package

SN74BCT374DWRG4 is housed in a 20-pin SOIC (DW) package measuring 12.80 mm × 7.50 mm, optimized for surface-mount assembly and thermal dissipation (R_θJA = 73.4°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal latch applications.

Compared with SN74ACT374DWR and SN74LS374DWR, the SN74BCT374DWRG4 uniquely balances high-current 3-state drive (64 mA), moderate propagation delay (9.1 ns), and low quiescent current (8 mA), making it optimal for bus-buffering applications requiring both robustness and timing predictability.

Availability

SN74BCT374DWRG4 is available at Aetrix Electronics and suitable for industrial control systems, test equipment interfaces, and legacy 5-V embedded computing platforms requiring stable component supply and long-term obsolescence management.

Supply support for SN74BCT374DWRG4 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 global semiconductor leader delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.

The SN74BCT374DWRG4 belongs to TI's legacy BCT logic family, engineered specifically for high-drive, 3-state bus interfacing in 5-V systems where TTL compatibility and noise immunity are essential.

FAQ

What is the recommended operating voltage range for SN74BCT374DWRG4?

The SN74BCT374DWRG4 operates reliably across 4.5 V to 5.5 V. This range ensures compatibility with standard 5-V TTL logic families and accommodates typical power supply tolerances. Operation outside this window risks violating absolute maximum ratings and may cause latch-up or parametric failure. Always verify VCC stability under load, especially during simultaneous output switching events that draw peak current.

Does SN74BCT374DWRG4 support asynchronous reset or preset functionality?

No, the SN74BCT374DWRG4 does not include asynchronous reset or preset inputs. It is a purely synchronous edge-triggered D-type latch: data appears at Q outputs only on the rising edge of CLK, and internal state is retained indefinitely when CLK is static. To initialize known states, external logic must apply valid D inputs followed by a CLK↑ pulse after power stabilization and any required reset sequencing.

Can SN74BCT374DWRG4 outputs be safely tied together in wired-OR configuration?

No, SN74BCT374DWRG4 outputs must never be directly paralleled. Its bipolar push-pull outputs lack inherent current limiting; connecting outputs together-even in high-impedance mode-can cause destructive shoot-through current. Bus sharing must be implemented using proper 3-state arbitration: only one device asserts OE low at any time, while others hold OE high to isolate their outputs electrically.

What decoupling capacitance is required for stable operation of SN74BCT374DWRG4?

A minimum 0.1-μF ceramic capacitor must be placed between VCC and GND, mounted physically adjacent to Pins 20 and 10. This suppresses high-frequency supply noise generated during output switching. For systems with high aggregate switching activity, paralleling a 1-μF capacitor improves low-frequency regulation. Avoid long traces or vias between the capacitor and IC pins, as inductance degrades high-frequency bypass effectiveness.

Is SN74BCT374DWRG4 compatible with 3.3-V input logic levels?

Yes, SN74BCT374DWRG4 accepts 3.3-V CMOS logic levels on its inputs. Its V_IH threshold is 2.0 V min and V_IL is 0.8 V max at VCC = 5 V, providing solid noise margin for 3.3-V signals. However, outputs swing rail-to-rail (0 V to VCC), so interfacing to 3.3-V receivers requires level translation or input tolerance verification to avoid overvoltage damage to downstream devices.