My Inquiry
My Account
Texas Instruments SN74ALS541-1DBR
- Part No.:
- SN74ALS541-1DBR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74ALS541-1DBR.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,033
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74ALS541-1DBR 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), pnp input structure for reduced DC loading, and supports 48 mA low-level output current per channel at VCC = 4.75–5.25 V - enabling direct drive of heavy capacitive loads or multiple TTL inputs.
For engineers reviewing the SN74ALS541-1DBR datasheet, SN74ALS541-1DBR pinout, SN74ALS541-1DBR application, or SN74ALS541-1DBR equivalent, this device is selected for legacy industrial control backplanes, retro-computing peripheral interfaces, and embedded system address/data bus isolation where ALS logic speed, 3-state bus arbitration, and SSOP packaging are required.
Technical Context
The SN74ALS541-1DBR implements a dual-NOR 3-state control gate: either OE1 or OE2 high forces all eight Y outputs into high-impedance mode. Its pnp input stage lowers input current draw versus standard TTL, improving fan-out capability without external pull-ups. The data flowthrough pinout places all eight A inputs on one side and all eight Y outputs on the opposite side - simplifying PCB routing in dense bus architectures.
As a -1 variant, it delivers enhanced IOL = 48 mA (vs. 24 mA in standard SN74ALS541), verified under VCC = 4.75–5.25 V, making it suitable for driving longer traces or higher-capacitance buses. Propagation delays range from 2 ns (tPHL min) to 14 ns (tPLH max) at CL = 50 pF, confirming its classification as a high-speed ALS-family buffer.
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; operation outside this range risks damage or undefined behavior. |
| IOL (max) | 48 mA per output - enables direct drive of up to 16 standard TTL loads (1.6 mA each) or long PCB traces with >100 pF capacitance. |
| tPLH / tPHL | 4–14 ns - ensures sub-15 ns signal propagation across all eight channels, critical for synchronous bus timing in 20–30 MHz systems. |
| 3-State Enable Logic | NOR-gated OE1/OE2 - any high enable input disables all outputs; allows flexible bus arbitration using active-low or active-high control signals. |
| Input Structure | pnp-based - reduces IIH to 20 µA and IIL to –0.2 mA, lowering power consumption and easing microcontroller GPIO drive requirements. |
| Package | SSOP-20 (DB) - 20-pin, 0.65 mm pitch, 7.5 mm × 5.6 mm body, surface-mount compatible with automated assembly and space-constrained layouts. |
| Thermal Impedance θJA | 70 °C/W - defines maximum junction temperature rise under typical board conditions; requires ≤ 19 mA average output current to stay within safe thermal limits at 70°C ambient. |
Pinout & Package
SN74ALS541-1DBR uses a 20-pin Small Outline Package (SSOP-DB), measuring 7.5 mm × 5.6 mm with 0.65 mm lead pitch and 2.0 mm max height. The package is RoHS-compliant, lead-finished with NiPdAu, and rated MSL Level-1 (unlimited floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A1–A8 Inputs | True (non-inverted) data inputs; pnp structure minimizes DC loading on upstream drivers. |
| 9 | GND | Ground reference for all internal circuitry and output stages; must be low-impedance connection. |
| 10 | VCC | +5 V supply; decoupling capacitor (0.1 µF ceramic) required within 5 mm of this pin. |
| 11, 12 | OE1, OE2 | Active-high 3-state enable inputs; NOR logic means either high disables all Y outputs. |
| 13–20 | Y1–Y8 Outputs | True buffered outputs; capable of sourcing –12 mA or sinking 48 mA (–1 version) in active state. |
Key Features
| Feature | Design Value |
|---|---|
| Enhanced Output Drive | 48 mA sink per output (–1 version) - eliminates need for external buffer stages when driving multiple TTL loads or long traces. |
| Data Flowthrough Pinout | Inputs (A1–A8) on left side, outputs (Y1–Y8) on right side - enables straight-through PCB trace routing, reducing crosstalk and layer count. |
| pnp Input Stage | IIH = 20 µA, IIL = –0.2 mA - cuts input current by >90% vs. standard TTL, allowing direct interface with CMOS or low-power MCU GPIOs. |
| Dual 3-State Control | OE1 and OE2 inputs with NOR logic - supports redundant enable paths or OR-ed bus arbitration signals without external gates. |
| ALS Logic Family Speed | tPHL = 2 ns (min), tPLH = 4 ns (min) - provides faster switching than LS-TTL while maintaining full 5 V compatibility. |
Applications
| Industrial Backplane Interface | Retrocomputing Memory Expansion |
|---|---|
|
Use Scenario: Isolating CPU address bus from multiple plug-in peripheral cards in a DIN-rail mounted PLC chassis. IC Role / Device Role / Timing Role: Octal buffer providing bidirectional address latching and 3-state bus contention management between master and slave modules. Use Value: 48 mA sink capability drives 150 pF backplane capacitance with <14 ns propagation delay, ensuring setup/hold compliance at 25 MHz clock rates. |
Use Scenario: Expanding RAM capacity in 1980s-era Z80-based computer systems using ISA-style expansion slots. IC Role / Device Role / Timing Role: True-data octal buffer isolating CPU address lines from memory module address decoders and latch ICs. Use Value: pnp input structure draws only 20 µA per input, preventing loading of vintage CPU address pins and preserving signal integrity over 10 cm ribbon cables. |
| Legacy Test Equipment Bus Driver | Embedded Microcontroller Address Latch |
|
Use Scenario: Driving GPIB (IEEE-488) bus handshaking lines and data lines in automated test equipment with mixed-vintage instrument interfaces. IC Role / Device Role / Timing Role: 3-state line driver enabling controlled assertion of ATN, IFC, or DAV signals without bus contention. Use Value: Dual OE inputs allow synchronized enable/disable of all eight outputs via FPGA-controlled signals, eliminating glitches during bus arbitration. |
Use Scenario: Buffering 8-bit address segments from an ARM Cortex-M0+ microcontroller to external SRAM or flash memory in space-constrained IoT edge nodes. IC Role / Device Role / Timing Role: Non-inverting octal buffer translating MCU GPIO voltage levels to robust 5 V TTL-compatible address lines. Use Value: SSOP-20 package (7.5 × 5.6 mm) fits tight layouts; 70 °C/W θJA allows operation at full drive strength in sealed enclosures up to 70°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS541DWR | Same logic function and pinout, but standard (non-–1) version with IOL = 24 mA max; SOIC-20 package (larger footprint, 2.65 mm height). | Lower drive strength suits shorter traces (<50 pF) or fewer TTL loads; preferred where thermal budget is tighter or board height is constrained. | Select SN74ALS541DWR if 24 mA output suffices and SOIC assembly infrastructure is already in place. |
| SN74ALS541-1NSR | Same –1 specification (48 mA IOL), but in SOP-20 package (wider body, 24.4 mm reel width); identical electrical specs and timing. | SOP offers easier manual rework and better thermal dissipation (θJA = 60 °C/W), but occupies ~30% more PCB area than SSOP. | Choose SN74ALS541-1NSR when board real estate permits and higher thermal margin is needed for sustained 48 mA operation. |
Compared with SN74ALS541DWR and SN74ALS541-1NSR, the SN74ALS541-1DBR uniquely combines maximum 48 mA drive, minimal 7.5 mm × 5.6 mm footprint, and industry-standard SSOP assembly compatibility - making it optimal for high-density, high-drive legacy digital systems where space and performance are both critical.
Availability
SN74ALS541-1DBR is available at Aetrix Electronics and suitable for industrial backplane interfaces, retrocomputing memory expansion, and embedded microcontroller address latching requiring stable component supply across extended product lifecycles.
Supply support for SN74ALS541-1DBR 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 innovation, delivering reliable, high-performance components for industrial, automotive, and computing applications.
The SN74ALS541-1DBR belongs to TI's legacy ALS (Advanced Low-Power Schottky) logic family, engineered specifically for high-speed, low-power bus interfacing in 5 V systems where compatibility with TTL, LS-TTL, and early microprocessor buses is essential.
FAQ
What is the maximum output current supported by SN74ALS541-1DBR?
The SN74ALS541-1DBR supports up to 48 mA of low-level output current (IOL) per channel when VCC is maintained between 4.75 V and 5.25 V. This is double the 24 mA rating of the standard SN74ALS541 and is validated in the official TI datasheet SDAS025D. Exceeding this limit or operating outside the specified VCC window may cause parametric deviation or reliability degradation in the SN74ALS541-1DBR.
Does SN74ALS541-1DBR support true or inverted data output?
The SN74ALS541-1DBR provides true (non-inverting) data output - meaning Y1–Y8 replicate the logic states of A1–A8 respectively. This distinguishes it from the SN74ALS540-1DBR, which delivers inverted outputs. The datasheet explicitly confirms that "the 'ALS541 provide true data at the outputs," and this applies identically to the –1 variant SN74ALS541-1DBR.
What is the recommended PCB layout practice for SN74ALS541-1DBR?
TI recommends placing a 0.1 µF ceramic decoupling capacitor between VCC (Pin 10) and GND (Pin 9) within 5 mm of the SN74ALS541-1DBR package. For the SSOP-DB footprint, use IPC-7351-compliant land patterns with non-solder-mask-defined pads and 0.125 mm stencil thickness for solder paste. Avoid routing high-speed signals under the device body to prevent coupling into the GND plane beneath the SN74ALS541-1DBR.
Is SN74ALS541-1DBR pin-compatible with other packages in the same family?
Yes - the SN74ALS541-1DBR shares identical pin numbering and function mapping with SN74ALS541-1N (PDIP), SN74ALS541-1DW (SOIC), and SN74ALS541-1NSR (SOP). All variants use the same 20-pin arrangement: A1–A8 on Pins 1–8, GND on Pin 9, VCC on Pin 10, OE1/OE2 on Pins 11–12, and Y1–Y8 on Pins 13–20. This allows drop-in replacement across packages when mechanical constraints permit.
What is the operating temperature range for SN74ALS541-1DBR?
The SN74ALS541-1DBR is rated for commercial operation from 0°C to +70°C ambient temperature, consistent with its SN74 prefix designation. This is confirmed in TI's ordering information table and package addendum, where SN74ALS541DBR and SN74ALS541-1DBR are both listed with TA = 0°C to 70°C. It is not rated for extended industrial (–40°C to +85°C) or military (–55°C to +125°C) ranges.
SN74ALS541-1DBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 20-SSOP (0.209", 5.30mm 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-SSOP
SN74ALS541-1DBR FAQ
1.How can I place an order for SN74ALS541-1DBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS541-1DBR 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 SN74ALS541-1DBR reliable?
The price and inventory of SN74ALS541-1DBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS541-1DBR is usually 5 days.
3.What payment methods are accepted for SN74ALS541-1DBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS541-1DBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS541-1DBR?
SN74ALS541-1DBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS541-1DBR 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 SN74ALS541-1DBR?
For technical support, including SN74ALS541-1DBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS541-1DBR requirements.
6.How does Aetrix verify that SN74ALS541-1DBR is sourced from the original manufacturer or authorized distributors?
All SN74ALS541-1DBR 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 SN74ALS541-1DBR meets industry standards.
7.What is the process for return or replacement of SN74ALS541-1DBR?
All SN74ALS541-1DBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS541-1DBR, 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 SN74ALS541-1DBR part is unused and in its original packaging.
Return procedure for SN74ALS541-1DBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74ALS541-1DBR 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…
