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Texas Instruments SN74ALS874BDW
- Part No.:
- SN74ALS874BDW
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALS874BDW.pdf
- Description:
- IC FF D-TYPE DUAL 4BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,681
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Product details
Overview
SN74ALS874BDW 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 driver. It features asynchronous clear (CLR), true logic output polarity, 24-pin SOIC (DW) package, 30 MHz maximum clock frequency, and operates from 0°C to 70°C at 4.5–5.5 V supply.
For engineers reviewing the SN74ALS874BDW datasheet, SN74ALS874BDW pinout, SN74ALS874BDW application, or SN74ALS874BDW equivalent, this page delivers verified functional identity, bus-driver timing behavior, 3-state control timing, thermal and voltage operating limits, and validated drop-in alternatives for legacy TTL bus interface designs.
Technical Context
This device implements two independent 4-bit D-type registers, 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; Q outputs reflect D inputs only when OE is low and CLR is high.
Its bus-structured pinout supports direct connection to data buses without external buffering. The 3-state outputs drive high-current loads (IOL = 24 mA, IOH = −2.6 mA) while maintaining TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V) and fast propagation delays (tPLH/tPHL ≤ 14 ns).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | Advanced Low-Power Schottky (ALS) TTL - ensures compatibility with legacy 74LS/74S systems and lower power than standard TTL. |
| Function | Dual 4-bit edge-triggered D flip-flop with 3-state noninverting outputs - enables bidirectional bus control and register staging in synchronous data paths. |
| Max Clock Frequency | 30 MHz - supports high-speed data latching in industrial control and instrumentation bus interfaces. |
| Output Drive | 24 mA sink / −2.6 mA source - directly drives terminated TTL/CMOS buses without external buffers. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded systems and board-level logic applications. |
| Supply Voltage | 4.5 V to 5.5 V - maintains stable operation across standard 5 V rail tolerances and noise margins. |
| Propagation Delay | tPLH/tPHL ≤ 14 ns (VCC = 4.5–5.5 V, CL = 50 pF) - ensures tight timing alignment in multi-register pipelines. |
Pinout & Package
SN74ALS874BDW uses a 24-pin SOIC (DW) package with 300-mil width, gull-wing leads, and JEDEC MO-153 compliant footprint. Pin 1 is located in quadrant Q1 per tape-and-reel orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1CLR, 2CLR | Asynchronous clear input (active-low) | Resets corresponding 4-bit register outputs to logic low independently of clock; overrides all other inputs. |
| 1OE, 2OE | Output enable input (active-low) | Controls 3-state output drivers: low enables Q1–Q4; high places outputs in high-impedance state. |
| 1CLK, 2CLK | Clock input (positive-edge triggered) | Latches data from D1–D4 into Q1–Q4 on rising edge; defines synchronous timing boundary for register update. |
| 1D1–1D4, 2D1–2D4 | Data inputs | Parallel 4-bit input ports accepting TTL-level signals; routed to respective flip-flop stages. |
| 1Q1–1Q4, 2Q1–2Q4 | Noninverting registered outputs | True logic outputs reflecting latched D values when OE is active; support bus-driving capability. |
| VCC, GND | Power supply terminals | Single 5 V supply with dedicated ground; decoupling required near pins 12 (GND) and 13 (VCC) for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Bus-structured pinout | Enables direct PCB routing to parallel data buses without signal crossing or layer stacking overhead. |
| 3-state buffer-type outputs | Allows multiple SN74ALS874BDW devices to share a common data bus with controlled contention-free access. |
| Asynchronous clear (CLR) | Provides immediate register reset without waiting for clock edge - critical for system initialization and fault recovery. |
| TTL-compatible input thresholds | VIH = 2 V min / VIL = 0.8 V max ensures robust interfacing with 74LS, 74F, and microcontroller GPIOs. |
| SOIC (DW) packaging | 24-pin surface-mount format supports automated assembly and offers better thermal performance than DIP variants. |
Applications
| Industrial PLC I/O Expansion | Legacy Bus Interface Adapter |
|---|---|
|
Use Scenario: Adding parallel digital I/O capability to programmable logic controllers using existing 5 V TTL backplanes. IC Role / Device Role / Timing Role: Acts as a buffered, clock-synchronized input latch and output register driving 8-bit data/address buses. Use Value: Enables deterministic sampling of field sensor inputs and synchronized updating of actuator outputs under scan-cycle timing constraints. |
Use Scenario: Bridging modern microcontrollers to legacy ISA or VMEbus peripherals requiring TTL-level, edge-triggered register interfaces. IC Role / Device Role / Timing Role: Serves as a protocol-transparent bus transceiver with configurable 3-state control and clock-domain isolation. Use Value: Eliminates need for discrete gate logic or level-shifting ICs while preserving original timing budgets and signal integrity. |
| Test Equipment Data Capture | Embedded System Configuration Register |
|
Use Scenario: Capturing parallel status bits from analog-to-digital converter outputs or sensor arrays in benchtop test instruments. IC Role / Device Role / Timing Role: Functions as a high-speed, low-latency input capture register synchronized to system trigger events. Use Value: Guarantees setup/hold compliance (tsu = 15 ns, th = 4 ns) for accurate snapshot acquisition at up to 30 MHz. |
Use Scenario: Storing boot-time configuration settings (e.g., memory map, peripheral enable) in fixed-function embedded controllers. IC Role / Device Role / Timing Role: Provides nonvolatile register storage via external latch control, retaining state between power cycles when backed by battery or capacitor. Use Value: Delivers deterministic, glitch-free register initialization during cold start without firmware dependency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual 4-bit D-type bus register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS874BN | Same logic function and timing, but in 24-pin PDIP (NT) package - through-hole mounting, no reflow compatibility. | Used where manual prototyping, socket-based testing, or legacy board repair is required. | Select SN74ALS874BN only when SOIC assembly is unavailable or mechanical constraints mandate DIP form factor. |
| SN74AS874DW | Faster propagation (≤8.5 ns) and higher clock rate (125 MHz), but higher ICC (up to 160 mA) and tighter VIH/VIL thresholds. | Suitable for high-speed bus arbitration or real-time control loops demanding sub-10 ns timing margins. | Choose SN74AS874DW when speed outweighs power budget; verify layout stability due to faster edge rates and increased noise sensitivity. |
Compared with SN74ALS874BDW, SN74ALS874BN offers identical electrical behavior in a through-hole package for serviceability, while SN74AS874DW trades higher power for significantly improved timing performance - both require careful evaluation of thermal management and signal integrity in high-density layouts.
Availability
SN74ALS874BDW is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy bus interface adapters, test equipment data capture, and embedded system configuration registers requiring stable component supply across long-lifecycle programs.
Supply support for SN74ALS874BDW 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 specializing in analog, embedded processing, and logic solutions, with over 50 years of innovation in industrial and automotive electronics.
The SN74ALS874BDW belongs to TI's legacy 74ALS logic family, engineered for reliable, low-power TTL-compatible bus interfacing in commercial-grade control and instrumentation systems.
FAQ
What is the primary function of the SN74ALS874BDW?
The SN74ALS874BDW is a dual 4-bit D-type edge-triggered flip-flop with 3-state noninverting outputs, optimized for bus-oriented register applications. It latches parallel data on the rising edge of CLK, provides asynchronous reset via CLR, and enables/disables outputs via OE - making it ideal for I/O port expansion and synchronous data buffering in 5 V TTL systems.
Does the SN74ALS874BDW support both true and inverting output logic?
No - the SN74ALS874BDW provides true (noninverting) Q outputs only. Inverting-output variants such as SN74ALS876A exist in the same family but are distinct part numbers with different pinouts and internal logic; SN74ALS874BDW does not implement preset functionality or inverted outputs.
What are the absolute maximum ratings for SN74ALS874BDW?
The SN74ALS874BDW 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 - especially VCC > 5.5 V during normal operation - risks permanent damage, as confirmed in the SDAS061C datasheet Absolute Maximum Ratings table.
Can SN74ALS874BDW be used in place of SN74LS874?
Yes - SN74ALS874BDW is a direct functional and pin-compatible upgrade to SN74LS874, offering lower power consumption (ICC ≈ 20–32 mA vs. LS-family ~40 mA), improved noise immunity, and identical timing and logic behavior. No PCB changes are required, though decoupling should be verified for ALS switching characteristics.
What is the recommended operating voltage range for SN74ALS874BDW?
The SN74ALS874BDW is specified for reliable operation at VCC = 4.5 V to 5.5 V, with nominal performance at 5 V. Operation below 4.5 V may cause marginal VIH/VIL margins and reduced output drive; above 5.5 V violates recommended conditions and risks reliability degradation over time.
SN74ALS874BDW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
SN74ALS874BDW FAQ
1.How can I place an order for SN74ALS874BDW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS874BDW 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 SN74ALS874BDW reliable?
The price and inventory of SN74ALS874BDW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS874BDW is usually 5 days.
3.What payment methods are accepted for SN74ALS874BDW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS874BDW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS874BDW?
SN74ALS874BDW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS874BDW 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 SN74ALS874BDW?
For technical support, including SN74ALS874BDW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS874BDW requirements.
6.How does Aetrix verify that SN74ALS874BDW is sourced from the original manufacturer or authorized distributors?
All SN74ALS874BDW 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 SN74ALS874BDW meets industry standards.
7.What is the process for return or replacement of SN74ALS874BDW?
All SN74ALS874BDW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS874BDW, 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 SN74ALS874BDW part is unused and in its original packaging.
Return procedure for SN74ALS874BDW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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