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Home > Products > Integrated Circuits (ICs) > Logic > Flip Flops

Texas Instruments SN74LVTH374NS

Name: SN74LVTH374NS
Brand: Texas Instruments
SKU: SN74LVTH374NS
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74LVTH374NS

Manufacturer:: Texas Instruments

Category:: Flip Flops

Package:: -

Datasheet:: SN74LVTH374NS.pdf

Description:: IC FF D-TYPE SNGL 8BIT 20SO

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Product details

Overview

SN74LVTH374NS from Fairchild Semiconductor is a low-voltage octal D-type flip-flop with 3-STATE outputs, designed for bus-oriented applications operating at 3.3V V_CC while interfacing to 5V TTL systems. It features bus-hold inputs (eliminating external pull-ups), ±32mA/64mA output drive, and operates across –40°C to +85°C.

For engineers reviewing the SN74LVTH374NS datasheet, SN74LVTH374NS pinout, SN74LVTH374NS application, or SN74LVTH374NS equivalent, this device is selected for high-speed data latching in mixed-voltage digital buses where glitch-free power-up/down behavior, live insertion capability, and robust ESD protection (>2000V HBM) are required.

Technical Context

The SN74LVTH374NS implements eight edge-triggered D-type flip-flops sharing a common buffered clock (CP) and buffered output enable (OE). Data is latched on the LOW-to-HIGH transition of CP, with setup time of 1.5ns and hold time of 0.8ns at V_CC = 3.3V.

Its bus-hold circuitry actively maintains input logic state when floating, reducing system-level component count. The 3-STATE outputs support bidirectional bus control with output enable propagation delays as low as 1.3ns (t_PZL) and disable times under 2.0ns (t_PLZ).

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Operating Range	2.7V to 3.6V - Ensures compatibility with 3.3V logic systems while tolerating supply variation.
Max Clock Frequency	160MHz - Supports high-throughput data capture in fast synchronous buses.
I_OH/I_OL	–32mA / +64mA - Drives heavy capacitive loads and interfaces directly with legacy 5V TTL without level shifters.
t_PHL/t_PLH	1.8ns to 5.2ns - Enables precise timing alignment in sub-5ns critical paths.
Bus-Hold Current	±75µA at V_I = 0.8V/2.0V - Maintains stable logic levels on unused inputs without external resistors.
ESD Rating (HBM)	>2000V - Meets industrial handling requirements without additional protection circuitry.
Operating Temperature	–40°C to +85°C - Qualified for extended industrial ambient conditions.

Pinout & Package

SN74LVTH374NS is housed in a 20-lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" wide package (M20B), with standard 1.27mm pitch and gull-wing leads.

Pin/Terminal	Circuit Role	Design Meaning
D0–D7	Data Inputs	Individual asynchronous data inputs for each of eight flip-flops; bus-hold enabled.
CP	Clock Pulse Input	Edge-triggered input; latches Dn states on LOW-to-HIGH transition; buffered for fanout.
OE	Output Enable Input	Active-LOW control: enables 3-STATE outputs when LOW; no effect on internal latch state.
O0–O7	3-STATE Outputs	True outputs with high-impedance state when OE is HIGH; capable of ±32mA/64mA drive.
V_CC, GND	Power Supply Pins	Single 3.3V supply rail; two dedicated V_CC and two GND pins reduce switching noise and improve signal integrity.

Key Features

Feature	Design Value
Bus-Hold Inputs	Eliminates need for 8 external pull-up resistors on D0–D7, reducing BOM count and board space.
Glitch-Free Power Sequencing	Power-up/down high-impedance ensures no bus contention during supply ramping or brownout events.
Live Insertion/Extraction Support	Enables hot-swap capability in backplane or modular systems without damaging adjacent components.
TTL-Compatible I/O	Accepts 5V-tolerant inputs and drives 5V TTL loads directly, enabling seamless 3.3V/5V domain bridging.
Latch-Up Immunity	Exceeds 500mA per JEDEC JESD78, ensuring robust operation in noisy industrial environments.

Applications

Industrial PLC Backplanes	Telecom Line Card Interfaces
Use Scenario: Latching parallel status signals from multiple I/O modules onto a shared backplane data bus. IC Role / Device Role / Timing Role: Octal D-type latch synchronizing asynchronous sensor inputs to a centralized controller clock domain. Use Value: Bus-hold prevents floating inputs during module hot-swap; 3-STATE outputs isolate inactive modules and avoid bus contention.	Use Scenario: Buffering configuration data between FPGA-based control logic and legacy 5V peripheral ICs on line cards. IC Role / Device Role / Timing Role: Level-shifting and bus-isolating register providing clean, timed data handoff between voltage domains. Use Value: ±32mA/64mA drive strength supports long trace runs and multiple TTL loads; 160MHz max clock enables real-time reconfiguration.
Automotive Body Control Modules	Test Equipment Digital Pattern Generators
Use Scenario: Capturing switch matrix inputs (door locks, window controls) before transmission over CAN or LIN subsystems. IC Role / Device Role / Timing Role: Synchronized input sampling device converting mechanical switch bounce into clean, debounced digital states. Use Value: –40°C to +85°C rating meets automotive under-hood requirements; >2000V HBM ESD withstand protects against assembly and field handling discharge.	Use Scenario: Generating precise, repeatable 8-bit stimulus patterns for IC functional testing at speeds up to 160MHz. IC Role / Device Role / Timing Role: High-speed pattern register feeding test vectors to device-under-test (DUT) inputs with minimal skew. Use Value: Sub-5ns propagation delay and 3.0ns minimum pulse width ensure timing-critical test vector fidelity; 3-STATE outputs allow multiplexed pattern routing.

Industrial PLC Backplanes

Telecom Line Card Interfaces

Use Scenario: Latching parallel status signals from multiple I/O modules onto a shared backplane data bus.

IC Role / Device Role / Timing Role: Octal D-type latch synchronizing asynchronous sensor inputs to a centralized controller clock domain.

Use Value: Bus-hold prevents floating inputs during module hot-swap; 3-STATE outputs isolate inactive modules and avoid bus contention.

Use Scenario: Buffering configuration data between FPGA-based control logic and legacy 5V peripheral ICs on line cards.

IC Role / Device Role / Timing Role: Level-shifting and bus-isolating register providing clean, timed data handoff between voltage domains.

Use Value: ±32mA/64mA drive strength supports long trace runs and multiple TTL loads; 160MHz max clock enables real-time reconfiguration.

Automotive Body Control Modules

Test Equipment Digital Pattern Generators

Use Scenario: Capturing switch matrix inputs (door locks, window controls) before transmission over CAN or LIN subsystems.

IC Role / Device Role / Timing Role: Synchronized input sampling device converting mechanical switch bounce into clean, debounced digital states.

Use Value: –40°C to +85°C rating meets automotive under-hood requirements; >2000V HBM ESD withstand protects against assembly and field handling discharge.

Use Scenario: Generating precise, repeatable 8-bit stimulus patterns for IC functional testing at speeds up to 160MHz.

IC Role / Device Role / Timing Role: High-speed pattern register feeding test vectors to device-under-test (DUT) inputs with minimal skew.

Use Value: Sub-5ns propagation delay and 3.0ns minimum pulse width ensure timing-critical test vector fidelity; 3-STATE outputs allow multiplexed pattern routing.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVT374NS	No bus-hold circuitry; requires external pull-ups on unused D inputs.	Suitable where input states are always driven or externally terminated.	Select when cost sensitivity outweighs board-space savings from eliminated resistors.
74ALVCH16374T	16-bit, dual-rail (1.65V–3.6V), no bus-hold, TSSOP-48 package.	Targets wider data buses and lower-voltage systems; not pin-compatible.	Choose for higher channel density and broader V_CC range, accepting larger footprint and redesign effort.

Compared with SN74LVT374NS and 74ALVCH16374T, the SN74LVTH374NS uniquely combines bus-hold functionality, 3.3V/5V interoperability, and SOIC-20 packaging-making it optimal for retrofitting legacy 5V systems with minimal layout change while eliminating discrete termination components.

Availability

SN74LVTH374NS is available at Aetrix Electronics and suitable for industrial PLC backplanes, telecom line card interfaces, and automotive body control modules requiring stable component supply, long-term lifecycle support, and consistent parametric performance.

Supply support for SN74LVTH374NS 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

Fairchild Semiconductor was a leading designer of high-performance analog and mixed-signal semiconductors, acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and communications infrastructure.

The SN74LVTH374NS belongs to Fairchild's LVT/H series of low-voltage TTL-compatible logic, engineered specifically for reliable 3.3V-to-5V domain bridging in mission-critical digital interconnects.

FAQ

What is the bus-hold feature of the SN74LVTH374NS and how does it affect system design?

The SN74LVTH374NS includes integrated bus-hold circuitry on all D0–D7 inputs, which actively maintains the last valid logic state when an input floats. This eliminates the need for eight external pull-up or pull-down resistors, reducing BOM cost and PCB area. In practice, the SN74LVTH374NS simplifies layout for sparsely populated data buses and improves reliability during hot-swap events where inputs may be momentarily unconnected.

Can the SN74LVTH374NS interface directly with 5V TTL devices?

Yes, the SN74LVTH374NS supports 5V-tolerant inputs and can drive standard 5V TTL loads: its inputs accept VI up to 5.5V, and its outputs source –32mA and sink +64mA-exceeding the –0.4mA/+16mA requirements of 74LS TTL. This allows the SN74LVTH374NS to serve as a direct bridge between 3.3V controllers and legacy 5V peripherals without level translators.

What is the maximum clock frequency supported by the SN74LVTH374NS and under what conditions?

The SN74LVTH374NS guarantees a maximum clock frequency of 160MHz under recommended operating conditions: V_CC = 3.3V ±0.3V, T_A = –40°C to +85°C, and C_L = 50pF. This specification is validated across temperature and voltage corners and applies to the SOIC package variant (e.g., SN74LVTH374NS); actual achievable frequency in a given design depends on trace capacitance, drive strength, and signal integrity.

How does the SN74LVTH374NS behave during power-up and power-down sequences?

The SN74LVTH374NS features power-up/down high-impedance outputs: during V_CC ramp-up or ramp-down, all O0–O7 outputs remain in high-impedance state regardless of OE or CP state. This prevents bus contention and glitches on shared data lines, making the SN74LVTH374NS suitable for systems with non-synchronous power sequencing or partial power cycling.

Is the SN74LVTH374NS pin-compatible with standard 74-series 374 devices?

The SN74LVTH374NS is functionally compatible with the 74 series 374 but not pin-compatible with through-hole 74374 (e.g., 74LS374 in PDIP-20). Its 20-pin SOIC footprint (M20B) matches other Fairchild LVT/H devices like SN74LVT374NS, but differs from legacy DIP or ceramic packages. Board-level replacement requires verifying land pattern and thermal pad compatibility-not just pin count or numbering.

SN74LVTH374NS Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: *

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

Function:: -

Type:: -

Output Type:: -

Number of Elements:: -

Number of Bits per Element:: -

Clock Frequency:: -

Max Propagation Delay @ V, Max CL:: -

Trigger Type:: -

Current - Output High, Low:: -

Voltage - Supply:: -

Current - Quiescent (Iq):: -

Input Capacitance:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

SN74LVTH374NS FAQ

1.How can I place an order for SN74LVTH374NS through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74LVTH374NS on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for SN74LVTH374NS reliable?

The price and inventory of SN74LVTH374NS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH374NS is usually 5 days.

3.What payment methods are accepted for SN74LVTH374NS?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVTH374NS transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74LVTH374NS?

SN74LVTH374NS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74LVTH374NS order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for SN74LVTH374NS?

For technical support, including SN74LVTH374NS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH374NS requirements.

6.How does Aetrix verify that SN74LVTH374NS is sourced from the original manufacturer or authorized distributors?

All SN74LVTH374NS products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN74LVTH374NS meets industry standards.

7.What is the process for return or replacement of SN74LVTH374NS?

All SN74LVTH374NS units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH374NS, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The SN74LVTH374NS part is unused and in its original packaging.

Return procedure for SN74LVTH374NS:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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