My Inquiry
My Account
Texas Instruments SN74ALS541-1DWRG4
- Part No.:
- SN74ALS541-1DWRG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALS541-1DWRG4.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,436
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74ALS541-1DWRG4 from Texas Instruments is an octal buffer/line driver with 3-state outputs, designed for bus interfacing and memory address register buffering in TTL-compatible digital systems. It features true (non-inverting) data flow, dual 3-state enable inputs (OE1/OE2), and supports 48 mA low-level output current (IOL) per channel at VCC = 4.75–5.25 V - enabling robust driving of heavy capacitive loads in industrial control backplanes.
For engineers reviewing the SN74ALS541-1DWRG4 datasheet, SN74ALS541-1DWRG4 pinout, SN74ALS541-1DWRG4 application, or SN74ALS541-1DWRG4 equivalent, this device is selected for legacy TTL system upgrades requiring high-current 3-state bus drivers with opposite-side input/output pinout to simplify PCB routing and reduce crosstalk.
Technical Context
This device implements a dual-NOR 3-state control gate: either OE1 or OE2 high forces all eight Y outputs into high-impedance state. Its pnp-input structure reduces DC loading on upstream logic, improving fanout in cascaded TTL designs.
It belongs to the ALS (Advanced Low-Power Schottky) family, offering improved speed-power tradeoffs over standard LS logic, with propagation delays as low as 2 ns (tPHL) and 4 ns (tPLH) under loaded conditions (CL = 50 pF).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - compatible with standard +5 V TTL supply rails without regulation overhead. |
| IOL (max) | 48 mA per output - enables direct drive of multiple LS/TTL inputs or moderate PCB trace capacitance without external buffers. |
| tPLH / tPHL | 4 ns / 2 ns (max) - ensures timing compliance in 25 MHz address/data bus applications with 50 pF load. |
| VIH / VIL | 2.0 V / 0.8 V - fully compatible with standard TTL input thresholds for seamless integration. |
| IOZH / IOZL | ±20 µA - guarantees minimal leakage in high-impedance state, critical for bus contention avoidance. |
| θJA (DW package) | 58 °C/W - allows sustained operation up to 70°C ambient with ≤19 mA ICC (outputs disabled) and no forced airflow. |
Pinout & Package
SN74ALS541-1DWRG4 is housed in a 20-pin SOIC (DW) package, 7.5 mm × 12.8 mm footprint, 2.65 mm max height, RoHS-compliant NiPdAu lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A1–A8 Inputs | True (non-inverting) data inputs; pnp structure minimizes DC loading on preceding stage. |
| 9 | GND | Ground reference for all logic and output stages; must be low-inductance connection in bus systems. |
| 10, 20 | VCC | +5 V supply; dual VCC pins reduce power distribution inductance across 8-channel operation. |
| 11, 19 | OE1, OE2 | Active-low 3-state enables (NOR logic); either high disables all outputs - supports redundant enable control. |
| 12–18 | Y1–Y8 Outputs | True buffered outputs; each capable of sinking 48 mA while maintaining VOL ≤ 0.5 V. |
| 19 | OE2 | Second 3-state enable input - allows independent gating of subsets via external logic if OE1 is tied low. |
Key Features
| Feature | Design Value |
|---|---|
| Data Flowthrough Pinout | Inputs (A1–A8) on left side, outputs (Y1–Y8) on right side - eliminates layer jumps and vias in dense bus layouts. |
| -1 Version Output Strength | 48 mA IOL per channel (vs. 24 mA in standard version) - supports higher fanout or longer traces without signal degradation. |
| pnp Input Structure | Reduces input current to ≤ –0.2 mA (IIL) - increases effective fanout from upstream TTL gates by >2× vs. standard LS. |
| Dual 3-State Enable Logic | 2-input NOR gate control (OE1/OE2) - enables flexible bus arbitration using either enable line alone or AND/NOR combinations. |
Applications
| Industrial PLC Backplane Interface | Legacy Memory Address Buffering |
|---|---|
|
Use Scenario: Driving 16-bit address buses between microcontroller and parallel EEPROM/Flash in programmable logic controllers. IC Role / Device Role / Timing Role: Non-inverting octal buffer isolating CPU address lines from memory chip inputs while enabling/disabling bus access via OE signals. Use Value: 48 mA IOL ensures reliable low-VOL switching across long backplane traces; opposite-side pinout simplifies 2-layer PCB routing. |
Use Scenario: Buffering 8-bit I/O port expansion in retro computing systems (e.g., Z80-based designs) where address/data separation is critical. IC Role / Device Role / Timing Role: True-level buffer with sub-10 ns propagation delay, synchronizing peripheral access timing without added clock skew. Use Value: pnp inputs draw negligible DC current from port pins, preserving drive capability for other peripherals on same bus segment. |
| TTL-to-LS Bus Translation | Test Equipment Signal Conditioning |
|
Use Scenario: Interfacing modern FPGA I/O banks (3.3 V LVTTL) to legacy 5 V TTL subsystems via level-shifting buffer stage. IC Role / Device Role / Timing Role: Voltage-tolerant input (VI up to 7 V) accepts 3.3 V logic highs while sourcing/sinking full TTL currents at 5 V. Use Value: Eliminates need for discrete level shifters; 48 mA sink strength drives multiple TTL loads directly from single FPGA pin group. |
Use Scenario: Providing controlled 3-state enable for stimulus signal distribution in automated test equipment (ATE) fixture wiring. IC Role / Device Role / Timing Role: Octal driver with fast enable/disable (tPZL = 8 ns, tPHZ = 1 ns) for precise timing-gated signal injection. Use Value: Dual OE inputs allow synchronized activation across multiple channels or independent channel grouping for multi-site testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS541DWR | Standard version: IOL = 24 mA (not 48 mA); identical pinout, timing, and voltage specs. | Suitable only for lighter loads (< 10 TTL units) or shorter traces; not recommended for high-fanout backplanes. | Select when cost sensitivity outweighs drive requirement and thermal margin is sufficient. |
| SN74ACT541DBR | ACT family: CMOS input (VIH = 2 V, VIL = 0.8 V), 50 mA IOL, 3.3 V/5 V tolerant, faster tPLH/tPHL (3.5 ns typ). | Better noise immunity and lower ICC, but requires careful handling of unused inputs; not drop-in due to different input structure. | Choose for new designs needing lower power, higher noise margin, or mixed-voltage compatibility - not for direct replacement. |
Compared with SN74ALS541DWR and SN74ACT541DBR, SN74ALS541-1DWRG4 uniquely delivers 48 mA drive within the ALS family's proven reliability and TTL interface compatibility - making it the optimal choice for upgrading legacy systems where increased current delivery is required without changing board layout or logic family.
Availability
SN74ALS541-1DWRG4 is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy memory subsystems, TTL bus translation, and ATE signal conditioning requiring stable component supply across extended product lifecycles.
Supply support for SN74ALS541-1DWRG4 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 50 years of analog and logic IC innovation, serving industrial, automotive, and communications markets with high-reliability, long-lifecycle components.
SN74ALS541-1DWRG4 belongs to TI's Advanced Low-Power Schottky (ALS) logic family, engineered specifically for robust, high-current bus interfacing in mission-critical industrial control and legacy system maintenance applications.
FAQ
What is the maximum output sink current for SN74ALS541-1DWRG4?
The SN74ALS541-1DWRG4 supports a maximum low-level output current (IOL) of 48 mA per channel when VCC is maintained between 4.75 V and 5.25 V. This rating is specific to the "-1" variant and exceeds the 24 mA limit of the standard SN74ALS541. The device maintains VOL ≤ 0.5 V under this condition, ensuring reliable TTL-level signaling in high-fanout configurations. Always verify thermal dissipation using θJA = 58 °C/W for the DW package.
Is SN74ALS541-1DWRG4 pin-compatible with SN74ALS541DWR?
Yes, SN74ALS541-1DWRG4 is fully pin-compatible with SN74ALS541DWR - both use the 20-pin SOIC (DW) package with identical pin assignments, electrical interface, and timing characteristics. The only functional difference is the higher 48 mA IOL rating of the -1 version. No PCB layout changes are required when upgrading, though thermal performance should be re-evaluated due to increased power dissipation under heavy load.
Does SN74ALS541-1DWRG4 support mixed-voltage operation?
No, SN74ALS541-1DWRG4 operates strictly at VCC = 4.5 V to 5.5 V and is not designed for mixed-voltage interfaces. While its inputs tolerate up to 7 V (allowing safe connection to 3.3 V logic outputs), the outputs swing rail-to-rail between GND and VCC and cannot interface directly with 3.3 V-only receivers without level translation. For true mixed-voltage systems, consider ACT-family alternatives like SN74ACT541DBR.
What is the purpose of the dual OE inputs (OE1 and OE2) on SN74ALS541-1DWRG4?
The dual OE inputs implement a 2-input NOR gate: asserting either OE1 or OE2 high places all eight Y outputs in high-impedance state. This architecture enables flexible bus control - for example, OE1 can serve as primary enable while OE2 connects to a fault-signal line for automatic bus release during error conditions. It also allows logical combination (e.g., with external inverters) to create custom enable functions without additional logic gates.
Can SN74ALS541-1DWRG4 be used in place of SN74ALS540-1DWR?
SN74ALS541-1DWRG4 and SN74ALS540-1DWR share identical pinout, timing, drive strength, and package, differing only in data polarity: SN74ALS541-1DWRG4 provides true (non-inverting) outputs, while SN74ALS540-1DWR provides inverted outputs. Substitution is electrically valid if the system logic accommodates inversion - otherwise, an external inverter or firmware adjustment is required. Always verify signal polarity requirements before replacement.
SN74ALS541-1DWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 15mA, 48mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74ALS541-1DWRG4 FAQ
1.How can I place an order for SN74ALS541-1DWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS541-1DWRG4 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 SN74ALS541-1DWRG4 reliable?
The price and inventory of SN74ALS541-1DWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS541-1DWRG4 is usually 5 days.
3.What payment methods are accepted for SN74ALS541-1DWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS541-1DWRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS541-1DWRG4?
SN74ALS541-1DWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS541-1DWRG4 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 SN74ALS541-1DWRG4?
For technical support, including SN74ALS541-1DWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS541-1DWRG4 requirements.
6.How does Aetrix verify that SN74ALS541-1DWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74ALS541-1DWRG4 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 SN74ALS541-1DWRG4 meets industry standards.
7.What is the process for return or replacement of SN74ALS541-1DWRG4?
All SN74ALS541-1DWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS541-1DWRG4, 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 SN74ALS541-1DWRG4 part is unused and in its original packaging.
Return procedure for SN74ALS541-1DWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74ALS541-1DWRG4 Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
