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Texas Instruments SN74AS841ANT
- Part No.:
- SN74AS841ANT
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74AS841ANT.pdf
- Description:
- BUS DRIVER, AS SERIES, 10-BIT,
- Quantity:
- Payment:
- Shipping:
Inventory:1,935
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Product details
Overview
SN74AS841ANT from Texas Instruments is a 10-bit noninverting D-type latch with 3-state outputs in a 24-pin plastic DIP (NT) package, operating at 4.5–5.5 V, delivering ±24 mA output drive, 1–10.5 ns propagation delay, and 0°C to 70°C temperature range - used for bus buffering and I/O port expansion in legacy industrial control and data acquisition systems.
For engineers reviewing the SN74AS841ANT datasheet, SN74AS841ANT pinout, SN74AS841ANT application, or SN74AS841ANT equivalent, this page delivers verified electrical specs, bus-structured pin mapping, latch timing behavior, and direct alternatives for 5 V TTL-compatible bus interface designs.
Technical Context
The SN74AS841ANT implements ten independent transparent D-type latches with buffered LE (Latch Enable) and OE (Output Enable) controls. Its noninverting data path ensures Q = D when LE is high, and retains state when LE goes low - enabling synchronous data capture without clock edge dependency.
All ten outputs support true 3-state operation: OE high forces high-impedance (Z), decoupling the device from the bus regardless of LE or data state; OE low enables normal logic-level outputs with ±24 mA drive capability and sub-11 ns switching under 50 pF load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74AS - Advanced Schottky TTL with higher speed and lower power than standard TTL. |
| Function | 10-bit noninverting D-type latch with independent 3-state output control (OE). |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL/CMOS mixed-signal systems. |
| Output Drive | ±24 mA - sufficient to directly drive heavily loaded buses without external buffers. |
| Propagation Delay | tPLH/tPHL ≤ 10.5 ns (D→Q), tPLH/tPHL ≤ 12 ns (LE→Q) - supports >50 MHz bus toggle rates. |
| Operating Temperature | 0°C to 70°C - rated for commercial/industrial ambient environments. |
| Input Compatibility | TTL-level inputs (VIH = 2 V min, VIL = 0.8 V max) - interoperable with legacy 74LS/74ALS logic. |
Pinout & Package
SN74AS841ANT uses a 24-pin plastic dual in-line package (NT), 300-mil width, with bus-structured pinout optimized for PCB layout efficiency and signal integrity on parallel data/address buses.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE (Output Enable) | Active-low control: OE = L enables outputs; OE = H places all Q pins in high-Z. |
| 2–11 | 1D–10D | Noninverting data inputs - latch value on rising edge of LE (or level-sensitive while LE = H). |
| 12 | GND | Ground reference for logic and output drivers. |
| 13–22 | 1Q–10Q | 3-state noninverting outputs - driven only when OE = L and LE has captured data. |
| 23 | VCC | Positive supply (4.5–5.5 V) for internal logic and output drivers. |
| 24 | LE (Latch Enable) | Active-high transparent latch control: Q follows D while LE = H; holds last value when LE = L. |
Key Features
| Feature | Design Value |
|---|---|
| Bus-structured pinout | Input/output pairs aligned (e.g., 1D/1Q adjacent) - minimizes trace length and crosstalk on dense PCBs. |
| Power-up high-impedance | Outputs default to Z-state at power-on - prevents bus contention during system initialization. |
| Buffered control inputs | OE and LE have internal buffers - reduces DC loading on upstream drivers and improves noise margin. |
| 3-state bus driving | Direct interface to shared data/address buses without pull-ups, series resistors, or external transceivers. |
| Wide output current range | ±24 mA drive supports termination and fan-out to ≥10 standard TTL loads per output. |
Applications
| Industrial PLC Backplane Interface | Legacy Test Equipment Data Capture |
|---|---|
|
Use Scenario: Isolating and latching address/data signals between microcontroller and peripheral modules on a 24-bit ISA-style backplane. IC Role / Device Role / Timing Role: Acts as a bidirectional bus latch - captures CPU writes via LE, presents data to peripherals via 3-state Q outputs controlled by OE. Use Value: Eliminates need for discrete bus transceivers; ±24 mA drive handles 15 cm routed traces with 50 pF load per line. |
Use Scenario: Capturing parallel sensor readings from analog-to-digital converters in automated calibration rigs. IC Role / Device Role / Timing Role: Synchronizes multi-channel ADC output into a stable 10-bit parallel word using LE strobe, then gates to test controller via OE. Use Value: Sub-11 ns D→Q delay ensures setup/hold compliance with 20 MHz sampling clocks; high-Z on OE prevents interference during readback. |
| Embedded Instrumentation I/O Expansion | Military Avionics Bus Buffering |
|
Use Scenario: Expanding GPIO count on an 80C188-based flight computer for discrete switch monitoring and relay control. IC Role / Device Role / Timing Role: Configured as input latch (OE = H, LE sampled) or output driver (OE = L, LE held high) - reconfigurable per cycle. Use Value: Noninverting logic simplifies firmware bit-mapping; 0°C to 70°C rating matches conduction-cooled chassis requirements. |
Use Scenario: Interfacing MIL-STD-1553B remote terminal data registers to a central bus controller via parallel status/data ports. IC Role / Device Role / Timing Role: Provides robust, latch-synchronized handshaking between serial protocol engine and parallel host interface. Use Value: Buffered OE/LE inputs reject EMI-induced glitches; 3-state isolation meets MIL-STD-461 CS114 conducted emissions limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus-interface latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS841NT | Lower drive (±24 mA → ±24 mA same, but IOH = –2.6 mA typ vs –24 mA typ for AS); slower tPHL (13 ns vs 10.5 ns). | Acceptable where bus capacitance < 30 pF and timing margin > 15 ns; lower ICC (23–40 mA vs 56–93 mA). | Choose for cost-sensitive, low-speed legacy upgrades where power budget is constrained. |
| SN74AS841DW | Same electrical specs, but SOIC-24 (DW) package - 300-mil DIP footprint not matched; no lead-free exemption in NT variant. | Required for surface-mount assembly; incompatible with through-hole sockets or wave soldering. | Choose only if board redesign allows SOIC placement and reflow compatibility is confirmed. |
Compared with SN74ALS841NT, SN74AS841ANT offers 2× faster LE→Q response and 10× higher output sink current, enabling tighter timing closure on high-capacitance buses; versus SN74AS841DW, it provides socket-compatible through-hole mounting but lacks RoHS-compliant finish options.
Availability
SN74AS841ANT is available at Aetrix Electronics and suitable for industrial control backplanes, legacy test instrumentation, embedded I/O expansion, and military avionics interfaces requiring stable component supply across long-lifecycle programs.
Supply support for SN74AS841ANT 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74AS841ANT belongs to TI's 74AS logic family - engineered for high-speed, low-noise 5 V TTL bus interfacing in systems where timing predictability and bus drive strength are critical.
FAQ
What is the maximum clock rate supported by SN74AS841ANT for reliable bus latching?
The SN74AS841ANT does not use a clock; it is a transparent latch controlled by LE. With tPLH/tPHL ≤ 10.5 ns (D→Q) and tPLH/tPHL ≤ 12 ns (LE→Q), it supports bus toggle rates up to 50 MHz when used with clean, fast LE strobes and 50 pF loads. Real-world maximum depends on PCB layout and drive strength of the LE source.
Does SN74AS841ANT support hot insertion or live bus connection?
No. SN74AS841ANT is not hot-swap rated. Absolute maximum ratings specify 5.5 V on disabled 3-state outputs, but no current-limiting or slew-rate control is provided. Connecting or disconnecting while powered risks latch-up or output damage due to voltage transients on Q pins.
Can SN74AS841ANT be used with 3.3 V microcontrollers?
Not directly. SN74AS841ANT requires 4.5–5.5 V VCC and TTL-level inputs (VIH ≥ 2 V). A 3.3 V MCU cannot reliably drive its inputs without level-shifting, and VCC must remain at 5 V to meet VOH/VOL specs. Use TI's SN74LVC8T245 or similar for 3.3 V ↔ 5 V translation.
What is the power consumption of SN74AS841ANT under typical operating conditions?
At VCC = 5.5 V, SN74AS841ANT draws 56–93 mA when outputs are active (high or low), 56–93 mA when outputs are disabled (OE = H), and ~36–60 mA when outputs are high. Total ICC scales with number of toggling outputs and load capacitance - design for worst-case 94 mA peak at full drive.
Is SN74AS841ANT pin-compatible with SN74ALS841NT?
Yes. SN74AS841ANT and SN74ALS841NT share identical 24-pin NT DIP packaging, pinout, and function mapping (OE, 1D–10D, GND, 1Q–10Q, VCC, LE). They are mechanically and electrically interchangeable at the board level, though SN74AS841ANT delivers superior speed and drive performance.
SN74AS841ANT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74AS841ANT FAQ
1.How can I place an order for SN74AS841ANT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS841ANT 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 SN74AS841ANT reliable?
The price and inventory of SN74AS841ANT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS841ANT is usually 5 days.
3.What payment methods are accepted for SN74AS841ANT?
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4.How is shipping managed for SN74AS841ANT?
SN74AS841ANT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS841ANT 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 SN74AS841ANT?
For technical support, including SN74AS841ANT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS841ANT requirements.
6.How does Aetrix verify that SN74AS841ANT is sourced from the original manufacturer or authorized distributors?
All SN74AS841ANT 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 SN74AS841ANT meets industry standards.
7.What is the process for return or replacement of SN74AS841ANT?
All SN74AS841ANT units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS841ANT, 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 SN74AS841ANT part is unused and in its original packaging.
Return procedure for SN74AS841ANT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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