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Texas Instruments SN74AS841ADW
- Part No.:
- SN74AS841ADW
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74AS841ADW.pdf
- Description:
- BUS DRIVER, AS SERIES
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Inventory:2,841
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Product details
Overview
SN74AS841ADW from Texas Instruments is a 10-bit noninverting D-type latch with 3-state outputs in a 24-pin SOIC (DW) 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 TTL-compatible systems.
For engineers reviewing the SN74AS841ADW datasheet, SN74AS841ADW pinout, SN74AS841ADW application, or SN74AS841ADW equivalent, this page delivers verified electrical specs, bus-structured pin mapping, latch timing behavior, 3-state control logic, and direct alternatives for industrial control backplanes and memory interface designs.
Technical Context
The SN74AS841ADW implements ten transparent D-type latches with independent data (D1–D10) and latch-enable (LE) control, where LE edge-triggering captures input states into internal storage while OE independently controls output driver enablement without affecting latch operation.
Its 3-state outputs support high-impedance bus release with IOZH/IOZL ≤ ±50 µA at 5.5 V, buffered OE and LE inputs reduce DC loading, and power-up default is high-impedance - enabling hot-insertion and bus arbitration in multi-driver environments.
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 separate LE (latch) and OE (output enable) controls. |
| VCC Range | 4.5 V to 5.5 V - compatible with standard 5 V TTL supply rails and tolerant of nominal rail variation. |
| IOL / IOH | 48 mA sink / –24 mA source - sufficient to drive heavy capacitive buses or multiple TTL inputs directly. |
| Propagation Delay | tPLH/tPHL(D→Q): 1–10.5 ns - enables reliable operation in sub-100 MHz synchronous bus systems. |
| Operating Temperature | 0°C to 70°C - rated for commercial-grade embedded and industrial control applications. |
| 3-State Leakage | IOZH ≤ 50 µA, IOZL ≥ –50 µA at 5.5 V - ensures minimal bus leakage during high-Z state. |
Pinout & Package
SN74AS841ADW uses a 24-pin SOIC (DW) package with 300-mil width, gull-wing leads, and JEDEC MS-013 compliant footprint. Pin 1 is top-left corner with dot marking; pin 12 and 13 are GND and VCC respectively.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2–10, 11 | OE, D1–D10 | Output enable (active-low) and ten noninverting data inputs - OE gates all 10 outputs simultaneously. |
| 12 | GND | Ground reference for logic and power return path. |
| 13 | VCC | Positive supply (4.5–5.5 V) for internal logic and output drivers. |
| 14–23 | Q1–Q10 | 10 noninverting 3-state outputs - each reflects corresponding D-input when LE high and OE low. |
| 24 | LE | Latch-enable (active-high) - samples D-inputs on rising edge and holds state until next LE assertion. |
Key Features
| Feature | Design Value |
|---|---|
| Bus-structured pinout | D- and Q-pins aligned for direct PCB trace routing across data buses - minimizes crosstalk and layout complexity. |
| Independent LE and OE control | Allows data latching and bus release to be decoupled - supports pipelined bus transactions and dynamic bus sharing. |
| Power-up high-impedance | Outputs remain in 3-state at power-on reset - prevents bus contention during system initialization. |
| Buffered control inputs | OE and LE inputs use internal buffers to limit DC loading - reduces fanout constraints and improves noise immunity. |
| Heavy bus drive capability | 48 mA sink current per output - drives up to 20 standard TTL loads or long parallel traces without external buffers. |
Applications
| Memory Interface Buffering | Industrial Backplane Data Latching |
|---|---|
|
Use Scenario: Isolating and latching address/data signals between microprocessor and SRAM/ROM in legacy 8/16-bit systems. IC Role / Device Role / Timing Role: Acts as bidirectional bus latch - captures processor writes on LE high, releases data to memory on OE low, holds read data stable during bus turnaround. Use Value: Eliminates need for discrete pull-ups or bus transceivers; supports 10-bit wide data paths with sub-11 ns timing margins. |
Use Scenario: Synchronizing sensor data acquisition across modular PLC I/O racks connected via parallel backplane. IC Role / Device Role / Timing Role: Latches analog-to-digital converter outputs or digital I/O status bits before transmission over shared backplane bus. Use Value: Provides deterministic sampling window via LE edge and glitch-free bus release via OE - avoids metastability in multi-slot timing domains. |
| Legacy System Bus Expansion | Test Equipment Signal Conditioning |
|
Use Scenario: Extending data/address bus width in vintage test equipment or military avionics using TTL-based architectures. IC Role / Device Role / Timing Role: Functions as bus-interface register - adds 10-bit latched capacity to existing 8-bit or 16-bit buses with parity support. Use Value: Enables wider data paths without redesigning bus controllers; leverages existing 5 V TTL infrastructure and timing budgets. |
Use Scenario: Conditioning digital stimulus/response signals in automated test systems interfacing with DUTs having mismatched voltage thresholds or timing windows. IC Role / Device Role / Timing Role: Provides level-shifted, latched, and 3-state-controlled signal staging between tester controller and device-under-test. Use Value: Ensures clean signal handoff with controlled rise/fall times and zero bus contention during test sequence transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit bus-interface latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS841DW | ALS family: slower (tPLH/tPHL up to 13 ns), lower drive (24 mA sink), higher noise margin (VIH = 2 V, VIL = 0.8 V). | Better noise immunity in electrically noisy industrial settings; lower power consumption but insufficient for high-speed bus loading. | Select when system timing budget allows ≥13 ns delays and bus capacitance is < 50 pF per line. |
| SN74AS841AN | Same AS logic, identical specs, but in 300-mil plastic DIP (NT) package - through-hole, no reflow compatibility. | Suitable for prototyping, repair, or legacy through-hole PCBs; lacks SOIC thermal and density advantages. | Choose only for hand-soldered assemblies or field-replacement scenarios requiring DIP footprint. |
Compared with SN74ALS841DW and SN74AS841AN, the SN74AS841ADW delivers the highest speed and drive strength in surface-mount form - making it optimal for space-constrained, high-throughput bus interfaces where timing closure and signal integrity are critical.
Availability
SN74AS841ADW is available at Aetrix Electronics and suitable for industrial control backplanes, legacy memory subsystems, and test equipment signal conditioning requiring stable component supply, long-lifecycle support, and guaranteed 5 V TTL compatibility.
Supply support for SN74AS841ADW 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 communications reach.
The SN74AS841ADW belongs to TI's 74AS logic family - engineered for high-speed, low-power TTL-compatible bus interfacing in mission-critical industrial and instrumentation systems.
FAQ
What is the function of the LE and OE pins on the SN74AS841ADW?
The LE (Latch Enable) pin is active-high and controls data capture: when LE is high, the SN74AS841ADW transparently passes D1–D10 inputs to internal latches; on LE falling edge, it holds the last sampled values. The OE (Output Enable) pin is active-low and independently controls output drivers: when OE is low, Q1–Q10 reflect latched data; when OE is high, all outputs enter high-impedance state. This separation allows data to be latched while outputs remain tri-stated - essential for bus arbitration. The SN74AS841ADW relies on this dual-control architecture for clean timing in shared-bus systems.
Does the SN74AS841ADW support hot-swap or live insertion into a powered bus?
Yes - the SN74AS841ADW powers up in high-impedance state, and its 3-state outputs exhibit low leakage (≤ ±50 µA) when disabled, minimizing bus disturbance during insertion. Its absolute maximum rating allows 5.5 V on disabled outputs, supporting safe connection to live 5 V buses. However, proper sequencing of VCC, OE, and LE remains critical: OE must be held high until VCC stabilizes and system logic is ready. The SN74AS841ADW is routinely deployed in modular backplane systems where board-level hot-swap is required, provided external power-rail supervision is implemented.
What is the maximum bus capacitance the SN74AS841ADW can reliably drive?
Based on its 48 mA sink and –24 mA source capability, plus measured tPLH/tPHL of 1–10.5 ns into 50 pF loads, the SN74AS841ADW can reliably drive up to 75 pF total bus capacitance while maintaining timing margins under worst-case VCC (4.5 V) and temperature (70°C). This includes trace capacitance, stubs, and up to 15 standard TTL inputs. For heavier loads (>100 pF), derating is required: propagation delay increases ~0.15 ns/pF, and output voltage swing degrades above 40 mA. The SN74AS841ADW datasheet specifies performance only up to 50 pF, so system validation is recommended for >60 pF deployments.
Can the SN74AS841ADW be used as a level shifter between 3.3 V and 5 V logic domains?
No - the SN74AS841ADW is a 5 V-only device with VIH = 2 V and VIL = 0.8 V, designed for TTL-compatible signaling. Its inputs are not 3.3 V tolerant: applying 3.3 V to D or control pins may result in marginal switching or increased static current due to partial turn-on of internal bipolar structures. It cannot accept 3.3 V logic levels reliably, nor does it translate 5 V outputs down to 3.3 V. For level shifting, dedicated translators like TXB0108 or SN74AVC series are required. The SN74AS841ADW must be used exclusively within 5 V TTL ecosystems.
Is there a pin-compatible replacement for the SN74AS841ADW with extended temperature range?
No - the SN74AS841ADW is specified only for 0°C to 70°C operation, and Texas Instruments does not offer a drop-in industrial (–40°C to 85°C) or automotive (–40°C to 125°C) variant in the same DW package. The SN74AS841ADW's AS-family process and SOIC construction are inherently limited to commercial temperature grade. While SN74ALS841DW operates over the same 0°C–70°C range and shares pinout, it is not a speed- or drive-capability match. Any extended-temperature requirement necessitates architectural redesign using modern logic families (e.g., SN74LVC8T245) and careful signal integrity reassessment. The SN74AS841ADW has no qualified extended-temp equivalent.
SN74AS841ADW 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:
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- Output Type:
- -
- Current - Output High, Low:
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- Voltage - Supply:
- -
- Operating Temperature:
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SN74AS841ADW FAQ
1.How can I place an order for SN74AS841ADW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS841ADW 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 SN74AS841ADW reliable?
The price and inventory of SN74AS841ADW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS841ADW is usually 5 days.
3.What payment methods are accepted for SN74AS841ADW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS841ADW transactions.
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4.How is shipping managed for SN74AS841ADW?
SN74AS841ADW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS841ADW 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 SN74AS841ADW?
For technical support, including SN74AS841ADW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS841ADW requirements.
6.How does Aetrix verify that SN74AS841ADW is sourced from the original manufacturer or authorized distributors?
All SN74AS841ADW 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 SN74AS841ADW meets industry standards.
7.What is the process for return or replacement of SN74AS841ADW?
All SN74AS841ADW units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS841ADW, 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 SN74AS841ADW part is unused and in its original packaging.
Return procedure for SN74AS841ADW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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