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Texas Instruments SN74ALS874BNT
- Part No.:
- SN74ALS874BNT
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74ALS874BNT.pdf
- Description:
- IC FF D-TYPE DUAL 4BIT 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,112
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Product details
Overview
SN74ALS874BNT from Texas Instruments is a dual 4-bit D-type edge-triggered flip-flop with 3-state noninverting outputs, designed as a bus-oriented register/buffer IC. It features asynchronous clear (CLR), true logic outputs, 24-pin plastic DIP (NT) package, and operates from 0°C to 70°C at 4.5–5.5 V supply. It drives TTL/LS bus lines directly in I/O port and bidirectional data path applications.
For engineers reviewing the SN74ALS874BNT datasheet, SN74ALS874BNT pinout, SN74ALS874BNT application, or SN74ALS874BNT equivalent, this page delivers verified functional identity, bus-structured pin mapping, timing-critical setup/hold values, 3-state enable behavior, and direct alternatives for legacy 74ALS bus interface designs.
Technical Context
This device implements two independent 4-bit D-register sections, each with edge-triggered clock (CLK↑), active-low asynchronous clear (CLR), and 3-state output enable (OE). Data is latched on the rising edge of CLK; CLR forces Q outputs low regardless of clock state. Output enable controls high-impedance tri-state operation per section.
The SN74ALS874BNT uses bipolar ALS (Advanced Low-Power Schottky) technology, delivering 24 mA sink current and −1 mA source current per output, with propagation delays as low as 4 ns (tPLH/tPHL) and maximum clock frequency of 30 MHz under standard load conditions (CL = 50 pF).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74ALS - Low-power Schottky TTL compatible with 5 V supply and standard TTL input thresholds |
| Function | Dual 4-bit edge-triggered D-type flip-flop with 3-state noninverting outputs and asynchronous clear |
| Supply Voltage | 4.5 V to 5.5 V - Ensures robust noise margin and compatibility with legacy 5 V TTL systems |
| Max Clock Frequency | 30 MHz - Supports high-speed bus buffering in industrial control and instrumentation data paths |
| Output Drive | 24 mA sink / −1 mA source - Directly interfaces with multiple TTL loads without external buffers |
| Propagation Delay | 4–14 ns (CLK→Q) - Enables precise timing alignment in synchronous register chains |
| Operating Temperature | 0°C to 70°C - Qualified for commercial-grade embedded and computing applications |
Pinout & Package
SN74ALS874BNT is supplied in a 24-pin plastic dual-in-line package (NT), with 300-mil body width and through-hole mounting. Pinout follows bus-structured layout optimized for PCB trace routing in memory and I/O expansion designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1CLR, 2CLR | Asynchronous clear input (active-low) | Resets corresponding 4-bit register's Q outputs to logic low independently of clock |
| 1OE, 2OE | Output enable input (active-low) | Places respective 4-bit output group (Q1–Q4) into high-impedance state when high |
| 1CLK, 2CLK | Clock input (positive-edge triggered) | Latches data from D1–D4 inputs on rising edge; defines synchronous timing boundary |
| 1D1–1D4, 2D1–2D4 | Data inputs | Parallel 4-bit data inputs per register section; sampled at CLK↑ |
| 1Q1–1Q4, 2Q1–2Q4 | Noninverting 3-state outputs | True logic outputs; driven low/high or tri-stated based on OE and CLR state |
| VCC, GND | Power supply terminals | Single 5 V supply with dedicated ground pin; decoupling required near VCC/GND pair |
Key Features
| Feature | Design Value |
|---|---|
| Bus-structured pinout | Enables compact PCB layout with minimized trace crossovers for parallel data buses |
| 3-state buffer-type outputs | Allows direct connection to shared data/address buses without external bus transceivers |
| Asynchronous clear (CLR) | Provides immediate register reset without waiting for next clock edge-critical for system initialization |
| True (noninverting) Q outputs | Eliminates need for external inverters in applications requiring direct data pass-through |
| ALS logic family performance | Combines 30 MHz speed with 16 mW typical power per section-optimized for legacy 5 V systems |
Applications
| Industrial PLC I/O Expansion | Legacy Computer Bus Interface |
|---|---|
Use Scenario: Expanding digital input/output capacity in programmable logic controllers using parallel backplane buses. IC Role / Device Role / Timing Role: Acts as a synchronized 8-bit latch/register with 3-state bus isolation, enabling hot-swappable I/O modules. Use Value: Eliminates need for discrete buffers and glue logic; supports deterministic sampling via CLK↑ and system-wide reset via shared CLR. | Use Scenario: Interfacing peripheral cards (e.g., floppy controller, video DAC) to ISA or proprietary 8/16-bit CPU buses. IC Role / Device Role / Timing Role: Serves as a bidirectional data register with tri-state control, synchronizing peripheral data transfers to CPU clock domain. Use Value: Provides 24 mA drive strength to meet TTL bus loading requirements while enabling clean bus release during idle cycles. |
| Test Equipment Data Capture | Embedded Instrumentation Register Bank |
Use Scenario: Capturing parallel sensor or waveform digitizer outputs in benchtop test instruments with microcontroller readback. IC Role / Device Role / Timing Role: Functions as an edge-triggered sample-and-hold register, freezing analog-to-digital converter outputs on trigger event. Use Value: Guarantees setup/hold compliance (tsu = 15 ns, th = 4 ns) for reliable capture at up to 30 MHz sampling rates. | Use Scenario: Implementing configurable configuration registers in field-deployable measurement devices with EEPROM-backed settings. IC Role / Device Role / Timing Role: Stores volatile runtime parameters (e.g., gain, offset, filter mode) accessible via microcontroller GPIO reads/writes. Use Value: Offers pin-compatible upgrade path from older 74LS series with improved speed and lower power consumption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual 4-bit 3-state D-register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS874BDWR | Same logic function and timing, but in SOIC-24 (DW) package with RoHS-compliant NiPdAu finish and tape-and-reel packaging | Suitable for automated SMT assembly; requires PCB redesign due to surface-mount footprint | Select when migrating from through-hole to SMT production or requiring RoHS compliance |
| SN74AS874DW | Faster AS-family variant: 125 MHz max clock, lower propagation delay (3–8.5 ns), higher drive (−15 mA / 48 mA), but higher ICC (82–133 mA) | Better suited for high-speed bus arbitration or clock-domain crossing where timing margin is critical | Select when speed and drive strength outweigh power budget constraints in new designs |
Compared with SN74ALS874BNT, SN74ALS874BDWR offers identical functionality in a modern SMT package, while SN74AS874DW trades higher power for significantly improved timing performance-enabling tighter synchronization in demanding real-time control loops.
Availability
SN74ALS874BNT is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy computer bus interface, and test equipment data capture requiring stable component supply across long-lifecycle embedded programs.
Supply support for SN74ALS874BNT 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 with over 90 years of analog and logic innovation, serving industrial, automotive, and communications markets.
The SN74ALS874BNT belongs to TI's legacy 74ALS logic family-designed specifically for high-reliability, 5 V TTL-compatible bus interfacing in industrial control and computing infrastructure where pin-level compatibility and proven field reliability are essential.
FAQ
What is the primary function of the SN74ALS874BNT in a digital system?
The SN74ALS874BNT functions as a dual 4-bit edge-triggered D-type flip-flop with 3-state noninverting outputs and asynchronous clear. It serves as a synchronized bus register or I/O port latch, enabling controlled data transfer between subsystems sharing a common data bus. Its design allows direct TTL bus driving without additional buffering, making it ideal for legacy 5 V system interconnects where timing predictability and bus isolation are required.
Does the SN74ALS874BNT support both true and inverting output logic?
No-the SN74ALS874BNT provides only true (noninverting) Q outputs. The inverting-output variant is the SN74ALS876A. This distinction is fixed by internal logic design; the SN74ALS874BNT cannot be configured for inverted output behavior. Designers requiring inversion must use external gates or select SN74ALS876A, which features active-low preset (PRE) and complemented Q outputs.
What are the absolute maximum ratings for the SN74ALS874BNT?
The SN74ALS874BNT has an absolute maximum supply voltage of 7 V, input voltage limit of 7 V, and operating free-air temperature range of 0°C to 70°C. Exceeding these ratings-even momentarily-may cause permanent damage. The device also specifies a storage temperature range of −65°C to 150°C and maximum voltage on disabled 3-state outputs of 5.5 V. These limits are defined in the official TI datasheet SDAS061C and must be respected in all design margins.
Can the SN74ALS874BNT be used in place of the SN74LS874?
Yes-the SN74ALS874BNT is a direct functional and pin-compatible upgrade to the SN74LS874, offering improved speed (30 MHz vs. 25 MHz), lower power consumption (typical ICC = 20–32 mA vs. ~45 mA), and enhanced noise immunity due to ALS Schottky clamping. No PCB changes are required, and all timing parameters-including setup/hold and propagation delays-are backward-compatible within standard TTL load conditions.
What package type does the SN74ALS874BNT use, and is it RoHS compliant?
The SN74ALS874BNT uses a 24-pin plastic dual-in-line package (NT), with 300-mil width and through-hole leads. It is not RoHS compliant, as it contains leaded solder (SnPb) finish and was manufactured prior to full RoHS transition. For RoHS-compliant alternatives, consider SN74ALS874BDWR (SOIC-24, NiPdAu finish, Level-1 MSL rating) - though this requires PCB layout revision due to different package type and mounting method.
SN74ALS874BNT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 24-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Master Reset
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Clock Frequency:
- 30 MHz
- Max Propagation Delay @ V, Max CL:
- 14ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 2.6mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 21 mA
- Input Capacitance:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 24-PDIP
SN74ALS874BNT FAQ
1.How can I place an order for SN74ALS874BNT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS874BNT 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 SN74ALS874BNT reliable?
The price and inventory of SN74ALS874BNT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS874BNT is usually 5 days.
3.What payment methods are accepted for SN74ALS874BNT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS874BNT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS874BNT?
SN74ALS874BNT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS874BNT 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 SN74ALS874BNT?
For technical support, including SN74ALS874BNT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS874BNT requirements.
6.How does Aetrix verify that SN74ALS874BNT is sourced from the original manufacturer or authorized distributors?
All SN74ALS874BNT 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 SN74ALS874BNT meets industry standards.
7.What is the process for return or replacement of SN74ALS874BNT?
All SN74ALS874BNT units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS874BNT, 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 SN74ALS874BNT part is unused and in its original packaging.
Return procedure for SN74ALS874BNT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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