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Texas Instruments SN74AC11874NT
- Part No.:
- SN74AC11874NT
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- -
- Datasheet:
-
SN74AC11874NT.pdf
- Description:
- 74AC11874 - DUAL 4-BIT D-TYPE ED
- Quantity:
- Payment:
- Shipping:
Inventory:1,061
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Product details
Overview
SN74AC11874NT from Texas Instruments is a dual 4-bit D-type edge-triggered flip-flop with 3-state bus-driver outputs, asynchronous clear (1CLR/2CLR), noninverting Q outputs, and flow-through pinout optimized for PCB layout. It operates from −40°C to 85°C at VCC = 3–5.5 V, supports up to 125 MHz clock frequency at 5 V, and drives bus lines directly with ±24 mA output current.
For engineers reviewing the SN74AC11874NT datasheet, SN74AC11874NT pinout, SN74AC11874NT application, or SN74AC11874NT equivalent, key selection criteria include asynchronous clear timing (4 ns pulse width), 3-state enable/disable propagation delays (1.5–9.8 ns), bus-hold immunity, EPIC process latch-up robustness (500 mA at 125°C), and compatibility with 3.3 V/5 V mixed-signal systems.
Technical Context
This device integrates two independent 4-bit D-flip-flop sections, each with dedicated clock (1CLK/2CLK), clear (1CLR/2CLR), output-enable (1OE/2OE), data (1D1–1D4 / 2D1–2D4), and output (1Q1–1Q4 / 2Q1–2Q4) terminals. Data latching occurs on the low-to-high clock transition; CLR asserts asynchronously to force Q outputs low regardless of clock state.
The flow-through architecture places inputs on one side and outputs on the opposite side of the 28-pin PDIP package, minimizing trace crossovers. Center-pin VCC and GND distribution reduces simultaneous switching noise, while EPIC 1-µm CMOS ensures stable operation across industrial temperature range with 500-mA latch-up immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | Advanced CMOS (AC), compatible with TTL input thresholds and 3.3 V/5 V systems |
| Operating Voltage | 3 V to 5.5 V - enables direct interface with both 3.3 V controllers and 5 V legacy buses |
| Max Clock Frequency | 125 MHz at VCC = 5 V - supports high-speed register staging in data acquisition pipelines |
| Output Drive | ±24 mA per output - sufficient to drive 50-pF loads with <9.6 ns propagation delay (tPHL) |
| 3-State Enable Delay | tPZH = 1.5 ns (min), tPLZ = 3.7 ns (min) at 5 V - enables precise bus arbitration timing control |
| Clear Pulse Width | 4 ns minimum - allows fast asynchronous reset without violating setup/hold margins |
| Input Capacitance | Ci = 4.5 pF - minimizes loading on upstream drivers in fan-out-critical designs |
Pinout & Package
SN74AC11874NT is housed in a 28-pin plastic dual in-line package (PDIP), NT suffix, with 0.6-inch body width and through-hole mounting. Pin 14 is GND, pin 28 is VCC; power pins are centrally located (pins 14, 15, 27, 28) to suppress ground bounce.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1CLK, 2CLK | Clock input (positive-edge triggered) | Low-to-high transition captures D-input values into respective 4-bit register stage |
| 1CLR, 2CLR | Asynchronous clear input | Active-low signal forces all four Q outputs low independently of clock state |
| 1OE, 2OE | Output enable control | Active-low enables 3-state buffer; high impedance when disabled isolates bus segments |
| 1D1–1D4, 2D1–2D4 | Data inputs | Parallel 4-bit data lanes synchronized to corresponding CLK and gated by OE |
| 1Q1–1Q4, 2Q1–2Q4 | Noninverting registered outputs | Provide buffered, edge-aligned copies of latched data; drive bus lines directly |
| VCC (Pins 15, 28), GND (Pins 14, 27) | Power supply terminals | Centered dual VCC/GND pairs reduce simultaneous switching noise and improve signal integrity |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout | Input pins on left side (1D1–1D4, 1CLR, 1OE, 1CLK), outputs on right (1Q1–1Q4) - eliminates layer jumps and vias in dense PCB routing |
| EPIC 1-µm CMOS process | Delivers 500-mA latch-up immunity at 125°C and stable AC performance across full industrial temperature range |
| Asynchronous clear | Independent 1CLR/2CLR inputs allow selective reset of either 4-bit section without affecting the other or requiring clock coordination |
| 3-State bus driving | Outputs meet IEEE Std 1149.1 boundary-scan-compatible drive strength and disable timing for shared-bus arbitration |
| Center-pin power distribution | Dual VCC (15,28) and GND (14,27) placement minimizes ground loop inductance and suppresses simultaneous switching output noise |
Applications
| Buffer Register for Data Acquisition | I/O Port Expansion |
|---|---|
|
Use Scenario: Capturing parallel sensor data (e.g., 8-channel ADC output) before serial conversion or DMA transfer. IC Role / Device Role / Timing Role: Dual 4-bit register latches two bytes synchronously on shared clock; 3-state outputs isolate data bus during readback. Use Value: Enables deterministic sampling alignment and prevents bus contention during multi-cycle transfers without external glue logic. |
Use Scenario: Expanding microcontroller GPIO count to drive LED arrays, relays, or discrete indicators in industrial HMIs. IC Role / Device Role / Timing Role: Acts as output port latch with asynchronous reset - clears all outputs on system fault or power-on initialization. Use Value: Provides fail-safe output state control and eliminates floating outputs during boot or watchdog timeout events. |
| Working Register in Control Logic | Bus Interface Isolation |
|
Use Scenario: Holding intermediate computation results (e.g., PID controller outputs) between processing cycles in PLC modules. IC Role / Device Role / Timing Role: Stores 8-bit working data with independent clear per nibble - supports modular state management in sequential logic. Use Value: Allows partial register reset without disturbing adjacent control bits, improving firmware modularity and debug visibility. |
Use Scenario: Isolating legacy 5 V peripheral buses from modern 3.3 V host processors in mixed-voltage embedded systems. IC Role / Device Role / Timing Role: Level-shifts and buffers bidirectional data paths using 3-state control synchronized to host timing. Use Value: Eliminates need for discrete level translators while maintaining timing integrity via sub-10 ns enable/disable propagation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual 4-bit D-type flip-flop with 3-state outputs applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT11874N | TTL-compatible input thresholds (VIH = 2 V min), slightly higher ICC (100 µA max), same pinout and AC specs | Better suited for noisy industrial environments where TTL noise margin is required | Select when interfacing with legacy 5 V TTL logic families or where input hysteresis improves noise immunity |
| 74AC11874PC | Same AC logic family and function but in 28-pin SOIC (DW) package - smaller footprint, surface-mount only | Preferred for space-constrained PCBs; not suitable for through-hole prototyping or high-vibration mechanical mounts | Choose for volume production with automated assembly; verify thermal derating for >85°C ambient |
Compared with SN74AC11874NT, SN74ACT11874N offers enhanced noise immunity at the cost of marginally higher quiescent current, while 74AC11874PC delivers identical logic behavior in a compact SOIC form factor - neither is pin-compatible due to differing package types (PDIP vs SOIC), making them functional alternatives rather than drop-in replacements.
Availability
SN74AC11874NT is available at Aetrix Electronics and suitable for industrial control systems, test equipment data capture stages, and legacy bus interface modules requiring stable component supply and long-term obsolescence support.
Supply support for SN74AC11874NT 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 decades of experience in industrial-grade logic families.
The SN74AC11874NT belongs to TI's AC logic series designed for high-speed, low-power bus interface and register applications in industrial, instrumentation, and communications infrastructure equipment.
FAQ
What is the maximum operating temperature range for the SN74AC11874NT?
The SN74AC11874NT is characterized for operation from −40°C to +85°C ambient temperature. This industrial temperature rating ensures reliable performance in factory automation, motor control, and outdoor instrumentation environments where thermal cycling and extended ambient ranges are common. The EPIC CMOS process contributes to its stability across this full range.
Does the SN74AC11874NT support 3.3 V logic levels?
Yes, the SN74AC11874NT supports 3.3 V operation with guaranteed functionality at VCC = 3 V to 5.5 V. At 3.3 V, it delivers 60 MHz maximum clock frequency, VIH = 2.1 V (min), and VOL ≤ 0.44 V with 12 mA sink current - enabling direct interfacing with 3.3 V microcontrollers and FPGAs without level-shifting circuitry.
How does the asynchronous clear function work on the SN74AC11874NT?
The SN74AC11874NT features two independent asynchronous clear inputs: 1CLR controls the first 4-bit section (1Q1–1Q4), and 2CLR controls the second (2Q1–2Q4). When either CLR pin is driven low, its corresponding Q outputs go low immediately - bypassing clock edges and setup/hold timing constraints - allowing rapid, deterministic register reset during fault recovery or initialization sequences.
What is the purpose of the flow-through pinout in the SN74AC11874NT?
The flow-through pinout of the SN74AC11874NT places all inputs (D, CLK, CLR, OE) on the left side and all outputs (Q) on the right side of the 28-pin PDIP package. This arrangement enables straight-line PCB routing from upstream logic to downstream bus traces, eliminating layer changes and vias - reducing signal skew, crosstalk, and layout complexity in high-density digital systems.
Is the SN74AC11874NT RoHS compliant?
The SN74AC11874NT is marked as OBSOLETE by Texas Instruments and was manufactured prior to mandatory RoHS enforcement. Its packaging documentation states "TBD" for Eco Plan, indicating no formal Pb-Free or Green certification was assigned. For new designs, Aetrix recommends verifying compliance status via TI's product content portal or selecting actively supported RoHS-compliant alternatives such as SN74AC11874DWR.
SN74AC11874NT 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:
- -
SN74AC11874NT FAQ
1.How can I place an order for SN74AC11874NT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AC11874NT 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 SN74AC11874NT reliable?
The price and inventory of SN74AC11874NT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AC11874NT is usually 5 days.
3.What payment methods are accepted for SN74AC11874NT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AC11874NT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AC11874NT?
SN74AC11874NT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AC11874NT 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 SN74AC11874NT?
For technical support, including SN74AC11874NT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AC11874NT requirements.
6.How does Aetrix verify that SN74AC11874NT is sourced from the original manufacturer or authorized distributors?
All SN74AC11874NT 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 SN74AC11874NT meets industry standards.
7.What is the process for return or replacement of SN74AC11874NT?
All SN74AC11874NT units undergo pre-shipment inspection (PSI). If there is an issue with SN74AC11874NT, 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 SN74AC11874NT part is unused and in its original packaging.
Return procedure for SN74AC11874NT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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