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

Texas Instruments SN74ALS374ANG4

Name: SN74ALS374ANG4
Brand: Texas Instruments
SKU: SN74ALS374ANG4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74ALS374ANG4

Manufacturer:: Texas Instruments

Category:: Flip Flops

Package:: 20-DIP (0.300", 7.62mm)

Datasheet:: SN74ALS374ANG4.pdf

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

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Product details

Overview

SN74ALS374ANG4 from Texas Instruments is an octal D-type edge-triggered flip-flop with 3-state outputs, designed for bus interface and register applications in TTL-compatible digital systems. It operates at 5 V, supports 35 MHz clock frequency, provides ±24 mA output drive, features independent output-enable control, and is qualified for 0°C to 70°C industrial operation.

For engineers reviewing the SN74ALS374ANG4 datasheet, SN74ALS374ANG4 pinout, SN74ALS374ANG4 application, or SN74ALS374ANG4 equivalent, this page delivers verified functional identity, validated timing parameters (t_PLH/t_PHL ≤ 12 ns), confirmed 3-state bus-driving capability, and precise package mapping to PDIP-20 with G4 suffix indicating tube packaging per TI's ordering convention.

Technical Context

This device implements eight independent D-type latches triggered on the positive clock edge, each with true (non-inverted) Q output and individual data input. Internal buffering isolates OE and CLK inputs from bus loading effects, enabling reliable parallel loading and hold operations even while outputs are in high-impedance state.

The SN74ALS374ANG4 belongs to the ALS (Advanced Low-Power Schottky) logic family, delivering higher speed than standard LS while maintaining compatible voltage thresholds (V_IL = 0.8 V max, V_IH = 2.0 V min) and reduced ICC (20–31 mA typical). Its 3-state outputs support bidirectional bus architectures without external pull-ups or interface components.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	ALS (Advanced Low-Power Schottky) - ensures TTL compatibility with improved speed-power tradeoff vs. LS.
Supply Voltage	4.5 V to 5.5 V - supports stable operation across standard 5 V rail tolerances.
Max Clock Frequency	35 MHz - enables high-speed register transfer in data paths up to 28.6 ns period.
Output Drive	±24 mA (I_OL/\|I_OH\|) - drives capacitive buses directly without external buffers.
Propagation Delay	t_PLH/t_PHL ≤ 12 ns - guarantees sub-13 ns edge-to-output timing for synchronous design margins.
3-State Enable Time	t_PZH/t_PLZ ≤ 17 ns - ensures fast bus release for time-critical multiplexing.
Operating Temperature	0°C to 70°C - certified for commercial/industrial ambient environments.

Pinout & Package

SN74ALS374ANG4 is packaged in a 20-pin plastic dual in-line package (PDIP-N), with 0.300-inch body width and through-hole mounting. Pin 1 is identified by a notch or dot; the package complies with JEDEC MS-001.

Pin/Terminal	Circuit Role	Design Meaning
1	OE (Output Enable)	Active-low control: asserts 3-state (high-Z) when high; enables normal Q outputs when low.
2–9, 12–19	D1–D4, Q1–Q4, D5–D8, Q5–Q8	Paired data inputs and true outputs (D1→Q1, ..., D8→Q8); full parallel access for 8-bit registers.
10	GND	Ground reference for all logic and power domains.
11	V_CC	+5 V supply pin - must be decoupled locally to suppress switching noise.
20	CLK	Clock input - positive-edge sensitive; triggers simultaneous latching of all eight D inputs to Q outputs.

Key Features

Feature	Design Value
Octal D-type latch with edge-triggered clock	Enables synchronized 8-bit data capture on single CLK↑ transition - critical for pipeline and buffer register integrity.
3-state outputs with independent OE	Allows dynamic bus sharing among multiple devices without contention; OE does not affect internal latch state.
Buffered control inputs (OE, CLK)	Reduces fan-out loading and improves noise immunity - supports direct connection to microcontroller GPIOs.
ALS logic family performance	Delivers 35 MHz operation with 20–31 mA ICC - balances speed, power, and legacy TTL interoperability.
Full parallel I/O access	Supports simultaneous read/write of all 8 bits - ideal for I/O port expansion and working register implementation.

Applications

Buffer Register	I/O Port Interface
Use Scenario: Holding data between asynchronous system blocks (e.g., CPU ↔ peripheral) where timing alignment is required. IC Role / Device Role / Timing Role: Acts as a clock-synchronized 8-bit storage element, capturing parallel data on CLK↑ and presenting it via 3-state outputs. Use Value: Eliminates metastability risk during domain crossing and provides deterministic setup/hold timing (t_su = 10 ns, t_h = 0 ns).	Use Scenario: Expanding microcontroller GPIO count for driving LEDs, switches, or sensors in industrial control panels. IC Role / Device Role / Timing Role: Functions as an 8-bit bidirectional I/O port with tri-state control, managed via dedicated OE signal. Use Value: Enables shared bus architecture without external transceivers - reduces BOM cost and PCB area.
Bidirectional Bus Driver	Working Register File
Use Scenario: Supporting data exchange between two processors or memory banks over a common 8-bit data bus. IC Role / Device Role / Timing Role: Provides direction-controlled bus isolation using paired SN74ALS374ANG4 units with complementary OE logic. Use Value: Achieves clean bus turn-around with t_PHZ/t_PLZ ≤ 17 ns - prevents bus contention during state transitions.	Use Scenario: Implementing temporary storage for arithmetic results or instruction operands in simple embedded controllers. IC Role / Device Role / Timing Role: Serves as a general-purpose 8-bit working register, loaded via parallel D inputs and read via Q outputs. Use Value: Supports full parallel access and retains data during OE assertion - allows non-disruptive register updates.

Buffer Register

I/O Port Interface

Use Scenario: Holding data between asynchronous system blocks (e.g., CPU ↔ peripheral) where timing alignment is required.

IC Role / Device Role / Timing Role: Acts as a clock-synchronized 8-bit storage element, capturing parallel data on CLK↑ and presenting it via 3-state outputs.

Use Value: Eliminates metastability risk during domain crossing and provides deterministic setup/hold timing (t_su = 10 ns, t_h = 0 ns).

Use Scenario: Expanding microcontroller GPIO count for driving LEDs, switches, or sensors in industrial control panels.

IC Role / Device Role / Timing Role: Functions as an 8-bit bidirectional I/O port with tri-state control, managed via dedicated OE signal.

Use Value: Enables shared bus architecture without external transceivers - reduces BOM cost and PCB area.

Bidirectional Bus Driver

Working Register File

Use Scenario: Supporting data exchange between two processors or memory banks over a common 8-bit data bus.

IC Role / Device Role / Timing Role: Provides direction-controlled bus isolation using paired SN74ALS374ANG4 units with complementary OE logic.

Use Value: Achieves clean bus turn-around with t_PHZ/t_PLZ ≤ 17 ns - prevents bus contention during state transitions.

Use Scenario: Implementing temporary storage for arithmetic results or instruction operands in simple embedded controllers.

IC Role / Device Role / Timing Role: Serves as a general-purpose 8-bit working register, loaded via parallel D inputs and read via Q outputs.

Use Value: Supports full parallel access and retains data during OE assertion - allows non-disruptive register updates.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74ALS374AN	Identical electrical specs and pinout; differs only in packaging - NG4 denotes tube packaging, N denotes standard tube without G4 suffix.	No functional difference; both rated for 0°C to 70°C, same ALS family timing and drive strength.	Select SN74ALS374ANG4 when tube packaging with TI's G4 ordering code is required for procurement traceability.
SN74AS374N	Faster (125 MHz max), higher drive (±48 mA), but consumes more current (ICC ≈ 120 mA) and uses AS (Advanced Schottky) logic family.	Suitable for high-speed backplanes or test equipment where speed outweighs power budget; not drop-in due to different VIH/VIL thresholds.	Choose SN74AS374N only if system requires >35 MHz operation and can accommodate higher power and tighter input voltage margins.

Compared with SN74ALS374ANG4, SN74ALS374AN offers identical functionality in standard tube packaging, while SN74AS374N trades higher speed and drive for increased power consumption and stricter input level requirements - making SN74ALS374ANG4 optimal for cost-sensitive, medium-speed industrial register and I/O applications.

Availability

SN74ALS374ANG4 is available at Aetrix Electronics and suitable for industrial control systems, legacy instrumentation interfaces, and embedded register file implementations requiring stable component supply and long-term obsolescence management.

Supply support for SN74ALS374ANG4 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 founded in 1930, specializing in analog, embedded processing, and logic solutions with broad industrial, automotive, and aerospace qualification.

The SN74ALS374ANG4 belongs to TI's legacy TTL logic portfolio, engineered for robustness and interoperability in industrial register, bus interface, and I/O expansion applications - emphasizing reliability over decades of field deployment.

FAQ

What is the operating temperature range for SN74ALS374ANG4?

The SN74ALS374ANG4 is characterized for operation from 0°C to 70°C, meeting commercial and industrial ambient requirements. It is not rated for extended temperature ranges like the military-grade SN54ALS374A (–55°C to 125°C). This range ensures stable timing and output drive performance in typical factory-floor or office-environment electronics where thermal management is moderate.

Does SN74ALS374ANG4 support true bidirectional data flow?

SN74ALS374ANG4 itself is unidirectional (D→Q), but enables bidirectional bus operation when paired with a second unit and controlled OE signals. Figure 2 in the datasheet shows how two SN74ALS374ANG4 devices can isolate and route data between two buses using complementary clock and enable sequencing - no internal bidirectional path exists within a single SN74ALS374ANG4.

What is the meaning of the 'G4' suffix in SN74ALS374ANG4?

The 'G4' suffix in SN74ALS374ANG4 indicates Texas Instruments' tube packaging variant - specifically, a 20-piece tube with standard PDIP-20 (N) body and TI's internal G4 packing code. It is functionally identical to SN74ALS374AN but designated for specific logistics and traceability handling in TI's distribution channel.

Can SN74ALS374ANG4 be used with 3.3 V logic systems?

No - SN74ALS374ANG4 is strictly a 5 V device with V_CC range 4.5 V to 5.5 V and TTL-compatible input thresholds (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V). Driving its inputs from 3.3 V logic may result in marginal or invalid high-level recognition; level-shifting circuitry is required for interoperability with 3.3 V systems.

How does the output-enable (OE) function interact with internal latch state?

OE has no effect on internal flip-flop operation in SN74ALS374ANG4: data remains latched at Q regardless of OE state. When OE is high, outputs go high-impedance (Z); when OE is low, Q values appear on pins. This allows new data to be loaded or old data retained while the bus is released - a key feature for glitch-free bus arbitration.

SN74ALS374ANG4 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74ALS

Package/Case:: 20-DIP (0.300", 7.62mm)

Packaging:: Tube

Product Status:: Discontinued at Digi-Key

Function:: Standard

Type:: D-Type

Output Type:: Tri-State, Non-Inverted

Number of Elements:: 1

Number of Bits per Element:: 8

Clock Frequency:: 35 MHz

Max Propagation Delay @ V, Max CL:: 16ns @ 5V, 50pF

Trigger Type:: Positive Edge

Current - Output High, Low:: 2.6mA, 24mA

Voltage - Supply:: 4.5V ~ 5.5V

Current - Quiescent (Iq):: 19 mA

Input Capacitance:: -

Operating Temperature:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 20-PDIP

SN74ALS374ANG4 FAQ

1.How can I place an order for SN74ALS374ANG4 through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74ALS374ANG4 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 SN74ALS374ANG4 reliable?

The price and inventory of SN74ALS374ANG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS374ANG4 is usually 5 days.

3.What payment methods are accepted for SN74ALS374ANG4?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS374ANG4 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74ALS374ANG4?

SN74ALS374ANG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74ALS374ANG4 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 SN74ALS374ANG4?

For technical support, including SN74ALS374ANG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS374ANG4 requirements.

6.How does Aetrix verify that SN74ALS374ANG4 is sourced from the original manufacturer or authorized distributors?

All SN74ALS374ANG4 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 SN74ALS374ANG4 meets industry standards.

7.What is the process for return or replacement of SN74ALS374ANG4?

All SN74ALS374ANG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS374ANG4, 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 SN74ALS374ANG4 part is unused and in its original packaging.

Return procedure for SN74ALS374ANG4:

1.Submit a request within 90 days.

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

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