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Texas Instruments SN74ALS541-1DW
- Part No.:
- SN74ALS541-1DW
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALS541-1DW.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:322
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Product details
Overview
SN74ALS541-1DW from Texas Instruments is an octal buffer and 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), pnp input structure to reduce DC loading, and supports 48 mA low-level output current (IOL) at VCC = 4.75–5.25 V - enabling robust drive capability for heavy capacitive loads in industrial control backplanes.
For engineers reviewing the SN74ALS541-1DW datasheet, SN74ALS541-1DW pinout, SN74ALS541-1DW application, or SN74ALS541-1DW equivalent, this device is selected for legacy TTL system upgrades requiring high-current 3-state bus drivers with opposite-side input/output pinout for simplified PCB routing and compatibility with SN74ALS240A-series layout practices.
Technical Context
The SN74ALS541-1DW 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 stage minimizes input current draw (IIL ≤ –0.2 mA), reducing loading on upstream logic. The -1 suffix denotes enhanced IOL rating (48 mA vs. 24 mA standard), validated only under tight VCC tolerance (4.75–5.25 V).
It uses a data flowthrough pinout - all eight A inputs on one side (pins 1–8), all eight Y outputs on the opposite side (pins 13–20) - enabling straight-through trace routing on double-layer boards. Propagation delays are asymmetric: tPHL (2–10 ns) is faster than tPLH (4–14 ns), reflecting ALS family's optimized low-to-high switching characteristics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - operates across full TTL supply range; -1 version requires 4.75–5.25 V for rated 48 mA IOL. |
| IOL (max) | 48 mA - enables direct driving of multiple TTL inputs or moderate-capacitance buses without external buffers. |
| VOH (min) | 2.4 V at IOH = –12 mA - ensures reliable high-level recognition by downstream TTL/LS devices. |
| VOL (max) | 0.5 V at IOL = 48 mA - maintains noise margin under full load, critical for stable bus signaling. |
| tPLH / tPHL | 4–14 ns / 2–10 ns - fast propagation supports >30 MHz bus operation in point-to-point configurations. |
| IOZH / IOZL | ±20 µA - low 3-state leakage preserves bus integrity during disable, minimizing contention current. |
| θJA (DW) | 58°C/W - SOIC-20 thermal resistance allows ~190 mW max power dissipation at TA = 70°C ambient. |
Pinout & Package
SN74ALS541-1DW is housed in a 20-pin SOIC (DW) package measuring 12.83 mm × 7.5 mm × 2.65 mm (max height), with 1.27 mm lead pitch and RoHS-compliant NiPdAu (NIPDAU) finish. It conforms to JEDEC MS-013 and is rated MSL Level-1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A1–A8 Inputs | True (non-inverted) data inputs; pnp structure limits IIH to 20 µA and IIL to –0.2 mA, reducing fanout burden. |
| 9 | GND | Ground reference for all logic and output stages; decoupling capacitor must be placed adjacent to pin 9. |
| 10 | VCC | +5 V supply; requires local 0.1 µF ceramic bypass capacitor between pins 10 and 9. |
| 11, 12 | OE1, OE2 | Active-low 3-state enables; NOR logic means either high disables all outputs - supports shared bus arbitration. |
| 13–20 | Y1–Y8 Outputs | True buffered outputs; each drives up to 48 mA sink current in low state; high-impedance leakage ≤ ±20 µA. |
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 bus routing. |
| pnp input structure | Reduces input current loading by >80% vs. standard TTL, allowing higher fanout without signal degradation. |
| Dual 3-state enable (OE1/OE2) | NOR-gated control permits flexible bus arbitration: either enable asserted → all outputs high-Z. |
| Enhanced IOL (–1 version) | 48 mA per output at VCC = 4.75–5.25 V - supports legacy backplane loads previously requiring discrete buffers. |
| TTL-compatible thresholds | VIH = 2.0 V min, VIL = 0.8 V max - interoperates seamlessly with 74LS, 74ALS, and 74F families. |
Applications
| Industrial Backplane Interface | Memory Address Buffering |
|---|---|
|
Use Scenario: Isolating CPU address lines from multiple peripheral modules on a 16-bit ISA-style backplane with 50–100 pF trace capacitance per slot. IC Role / Device Role / Timing Role: Octal non-inverting buffer with 3-state control, enabling time-multiplexed address sharing across slots while maintaining signal integrity. Use Value: 48 mA IOL drives full backplane capacitance without waveform distortion; 2–10 ns tPHL ensures setup time compliance for 25 MHz address strobes. |
Use Scenario: Buffering 8-bit segment address outputs from a microcontroller to parallel EEPROM and FPGA configuration memory. IC Role / Device Role / Timing Role: True-level address latch driver with independent 3-state control per group, preventing bus contention during memory reconfiguration. Use Value: Dual OE inputs allow synchronized disable during FPGA reset; pnp inputs limit MCU GPIO loading to <20 µA per line. |
| Legacy System Bus Extender | TTL Logic Level Translator |
|
Use Scenario: Extending a 74ALS240A-based control bus across two PCBs via ribbon cable with 30 cm length and 80 pF total capacitance. IC Role / Device Role / Timing Role: High-current octal driver providing impedance matching and slew rate control for long-line transmission. Use Value: 0.5 V VOL at 48 mA ensures >0.4 V noise margin over cable; 58°C/W θJA prevents thermal derating in enclosed chassis. |
Use Scenario: Interfacing 3.3 V FPGA I/O (with 5 V-tolerant inputs) to legacy 5 V TTL peripherals requiring VIH ≥ 2.0 V. IC Role / Device Role / Timing Role: Non-inverting level-shifting buffer translating 3.3 V logic highs to full 5 V swing while sinking 48 mA. Use Value: VOH = 2.4 V min at –12 mA meets TTL VIH requirement; VOL = 0.5 V max guarantees clean low detection by 5 V receivers. |
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 |
|---|---|---|---|
| SN74ALS541DW | Standard version: IOL = 24 mA (not 48 mA); identical pinout, timing, and voltage specs. | Not suitable for high-capacitance or multi-load bus segments requiring >24 mA drive. | Select SN74ALS541DW only if load current ≤24 mA and cost sensitivity outweighs margin requirements. |
| SN74LS241N | Lower drive (IOL = 20 mA), higher ICC (25 mA vs. 15–25 mA), no -1 variant; PDIP-only, no SOIC option. | Limited to low-speed (<10 MHz), low-fanout applications; lacks SOIC packaging for space-constrained designs. | Choose SN74LS241N only for cost-driven, through-hole-only legacy repairs where 48 mA is unnecessary. |
Compared with SN74ALS541DW and SN74LS241N, the SN74ALS541-1DW delivers 100% higher sink current in the same SOIC-20 footprint, enabling single-chip replacement of dual LS241s in high-reliability industrial backplanes without layout changes.
Availability
SN74ALS541-1DW is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory address buffering, legacy system bus extension, and TTL level translation requiring stable component supply and long-term obsolescence mitigation.
Supply support for SN74ALS541-1DW 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, headquartered in Dallas, Texas.
The SN74ALS541-1DW belongs to TI's legacy 74ALS logic family, engineered for high-speed, low-power TTL-compatible systems in industrial control, test equipment, and military-grade computing platforms.
FAQ
What is the maximum output sink current supported by SN74ALS541-1DW?
The SN74ALS541-1DW supports a maximum low-level output current (IOL) of 48 mA per channel, but only when VCC is maintained within 4.75 V to 5.25 V. This rating is explicitly defined in the "recommended operating conditions" table of the SDAS025D datasheet and does not apply outside that narrow supply range. At nominal 5 V, the device delivers 24 mA in standard mode.
Does SN74ALS541-1DW have inverted or non-inverted outputs?
The SN74ALS541-1DW provides true (non-inverted) outputs - Yn = An for n = 1 to 8. This distinguishes it from the SN74ALS540-1DW, which offers inverted outputs (Yn = NOT An). The '541 designation in the part number explicitly indicates true logic polarity, confirmed in the "description" section of the SDAS025D datasheet.
What is the function of OE1 and OE2 on SN74ALS541-1DW?
OE1 and OE2 are active-low 3-state enable inputs wired to a 2-input NOR gate inside the SN74ALS541-1DW. If either OE1 or OE2 is driven high, all eight outputs (Y1–Y8) enter high-impedance state. Both must be low for normal buffered output operation. This architecture enables flexible bus arbitration using either enable independently.
Can SN74ALS541-1DW replace SN74ALS541DW in existing designs?
Yes, SN74ALS541-1DW is pin-compatible and functionally identical to SN74ALS541DW except for its higher 48 mA IOL rating (vs. 24 mA). All timing, voltage, and DC parameters match exactly outside the enhanced drive condition. No PCB or firmware changes are required - the -1 version simply extends margin for heavier bus loads.
What package type and dimensions does SN74ALS541-1DW use?
SN74ALS541-1DW uses a 20-pin SOIC (DW) package per JEDEC MS-013, with body dimensions of 12.83 mm × 7.5 mm × 2.65 mm max height and 1.27 mm lead pitch. It features NiPdAu (NIPDAU) lead finish, is RoHS-compliant, and carries MSL Level-1 rating - verified in TI's Package Option Addendum and DW0020A outline drawing.
SN74ALS541-1DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- 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
SN74ALS541-1DW FAQ
1.How can I place an order for SN74ALS541-1DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS541-1DW 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 SN74ALS541-1DW reliable?
The price and inventory of SN74ALS541-1DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS541-1DW is usually 5 days.
3.What payment methods are accepted for SN74ALS541-1DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS541-1DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS541-1DW?
SN74ALS541-1DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS541-1DW 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 SN74ALS541-1DW?
For technical support, including SN74ALS541-1DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS541-1DW requirements.
6.How does Aetrix verify that SN74ALS541-1DW is sourced from the original manufacturer or authorized distributors?
All SN74ALS541-1DW 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 SN74ALS541-1DW meets industry standards.
7.What is the process for return or replacement of SN74ALS541-1DW?
All SN74ALS541-1DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS541-1DW, 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 SN74ALS541-1DW part is unused and in its original packaging.
Return procedure for SN74ALS541-1DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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