My Inquiry
My Account
Texas Instruments SN74ALS541DBR
- Part No.:
- SN74ALS541DBR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74ALS541DBR.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,347
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74ALS541DBR 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 for reduced DC loading, and operates at 4.5–5.5 V supply. Its data flowthrough pinout places all eight inputs on one side and outputs on the opposite side to simplify PCB layout.
For engineers reviewing the SN74ALS541DBR datasheet, SN74ALS541DBR pinout, SN74ALS541DBR application, or SN74ALS541DBR equivalent, key selection considerations include its 24 mA low-level output drive (standard version), 14 ns max propagation delay (A→Y), 20-pin SSOP package with 0.65 mm pitch, and compatibility with ALS logic family timing and voltage thresholds.
Technical Context
The SN74ALS541DBR 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 compared to standard TTL, improving fan-out in dense bus environments.
It belongs to the 74ALS family and maintains electrical compatibility with SN74ALS240A-series performance while adopting a split-side pinout-inputs (A1–A8) on left, outputs (Y1–Y8) on right-enabling straight-through trace routing without layer jumps or vias in memory or data bus applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures stable operation across industrial-grade 5 V rails with ±10% tolerance. |
| Output Drive (IOL) | 24 mA - Supports direct driving of multiple TTL loads or short PCB traces without external buffers. |
| Propagation Delay (tPLH/tPHL) | 4–14 ns - Enables reliable operation up to ~50 MHz bus clocking in synchronous address/data paths. |
| 3-State Enable Time (tPZL) | 8–20 ns - Determines minimum bus turnaround time when switching between read/write cycles. |
| Input Thresholds (VIH/VIL) | 2.0 V / 0.8 V - Guarantees noise margin >0.4 V under worst-case conditions for robust logic-level recognition. |
| Package Thermal Impedance (θJA) | 70 °C/W - Requires minimal heatsinking in ambient temperatures ≤70°C for continuous 24 mA per output. |
| Operating Temperature | 0°C to 70°C - Qualified for commercial-grade embedded control, instrumentation, and legacy computing systems. |
Pinout & Package
SN74ALS541DBR is housed in a 20-pin Small Outline Package (SSOP), DB package type, with 0.65 mm lead pitch, 7.4 mm body width, and 8.2 mm length. 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 (Data Inputs) | True (non-inverting) logic inputs accepting TTL-compatible voltage levels; pnp structure reduces DC loading on upstream drivers. |
| 9 | GND | Ground reference for all internal circuitry and output stages; must be low-impedance for stable 3-state transitions. |
| 10, 20 | VCC | Primary 5 V supply; dual VCC pins reduce power distribution inductance and improve transient response during output switching. |
| 11, 19 | OE1, OE2 | Active-low 3-state enables - NOR logic means either high disables all outputs; supports independent or tied control schemes. |
| 12, 13, 14, 15, 16, 17, 18, 20 | Y1–Y8 (Outputs) | True-buffered, 3-state outputs capable of sinking 24 mA each; high-impedance state isolates bus segments during contention. |
Key Features
| Feature | Design Value |
|---|---|
| Data Flowthrough Pinout | Inputs (A1–A8) on left side, outputs (Y1–Y8) on right side - eliminates crossover traces and reduces layer count in bus routing. |
| pnp Input Structure | Reduces input current to ≤–0.2 mA (IIL) - increases effective fan-out and lowers power demand on preceding logic stages. |
| Dual 3-State Enable Logic | OE1 and OE2 form a 2-input NOR gate - allows flexible bus arbitration using separate read/write enables or OR-tied control. |
| TTL-Compatible Electricals | VIH = 2.0 V, VOL = 0.4 V @ 24 mA - ensures interoperability with legacy 74LS/74ALS/74F systems without level-shifting. |
| Low Propagation Skew | tPLH/tPHL variation ≤10 ns across all eight channels - preserves data integrity in parallel address or data buses. |
Applications
| Memory Address Buffering | Parallel Bus Isolation |
|---|---|
|
Use Scenario: Driving 16-bit address lines from a microprocessor to multiple memory ICs (e.g., SRAM, EPROM) on a shared bus. IC Role / Device Role / Timing Role: Non-inverting octal buffer providing current gain and 3-state isolation to prevent address contention during DMA or peripheral access. Use Value: Eliminates need for discrete transistor arrays; 24 mA drive ensures full logic swing across 10 cm PCB traces at 10 MHz. |
Use Scenario: Separating CPU data bus from peripheral I/O ports (e.g., UART, GPIO expanders) in an industrial controller. IC Role / Device Role / Timing Role: Bidirectional bus driver controlled by CPU RD/WR signals via OE1/OE2 to enforce unidirectional data flow. Use Value: Prevents signal corruption during bus handshaking; 14 ns max tPHL enables sub-70 ns cycle times in 8051-based designs. |
| Legacy System Backplane Interface | Test Equipment Signal Conditioning |
|
Use Scenario: Interfacing modern FPGA I/O banks to vintage backplane standards (e.g., STD Bus, Multibus I) requiring ALS-level drive strength. IC Role / Device Role / Timing Role: Level-translating buffer that matches vintage TTL timing margins while tolerating FPGA 3.3 V LVTTL inputs via series resistors. Use Value: Maintains setup/hold compliance with tPLH ≤14 ns and VIH = 2.0 V, avoiding redesign of aging test fixtures. |
Use Scenario: Conditioning digital stimulus signals in automated test equipment (ATE) before applying to DUT inputs. IC Role / Device Role / Timing Role: Output driver with precise VOL ≤0.4 V and fast disable (tPZL ≤20 ns) to minimize glitch duration during pattern switching. Use Value: Reduces false triggering on sensitive analog comparators or high-speed ADC reference inputs during test vector changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer and line driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS541N | 20-pin PDIP package; θJA = 69°C/W; same electrical specs and pinout as SN74ALS541DBR. | Suitable for through-hole prototyping or legacy board rework where surface-mount assembly is unavailable. | Select SN74ALS541N for hand-soldered development boards or field-repair scenarios requiring socket compatibility. |
| SN74ALS541DWR | 20-pin SOIC (DW) package; θJA = 58°C/W; identical logic function, timing, and drive capability. | Better thermal performance and higher board density than SSOP; requires different land pattern and stencil design. | Choose SN74ALS541DWR when thermal headroom is critical or when migrating from SSOP to SOIC for supply chain flexibility. |
Compared with SN74ALS541N and SN74ALS541DWR, the SN74ALS541DBR offers the smallest footprint (SSOP) among ALS octal buffers but has the highest thermal resistance; it is optimal for space-constrained commercial designs where 70°C/W is acceptable and fine-pitch assembly is supported.
Availability
SN74ALS541DBR is available at Aetrix Electronics and suitable for memory subsystems, industrial backplanes, legacy test equipment, and embedded controller bus interfaces requiring stable component supply and long-term obsolescence management.
Supply support for SN74ALS541DBR 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 for industrial, automotive, and communications markets.
The SN74ALS541DBR belongs to TI's 74ALS logic family, engineered for high-speed, low-power TTL-compatible operation in legacy and upgrade systems where reliability and pin-for-pin compatibility with older 74-series devices are essential.
FAQ
What is the maximum output sink current for SN74ALS541DBR?
The SN74ALS541DBR supports a guaranteed low-level output current (IOL) of 24 mA per channel under recommended operating conditions (VCC = 4.5 V, TA = 0°C to 70°C). This rating applies to the standard version; the -1 variant supports 48 mA but is not offered in the DB package. Exceeding 24 mA risks violating VOL specifications or thermal limits in the SSOP package.
Does SN74ALS541DBR support inverted output functionality?
No, the SN74ALS541DBR provides true (non-inverting) data outputs only. The inverted-output variant is the SN74ALS540DBR, which shares identical pinout and electrical characteristics except for output polarity. TI does not offer an inverted version under the SN74ALS541DBR part number.
What is the purpose of having two output-enable inputs (OE1 and OE2) on SN74ALS541DBR?
The SN74ALS541DBR uses a dual-NOR gate for 3-state control: either OE1 or OE2 driven high places all eight outputs in high-impedance mode. This allows flexible bus arbitration-for example, OE1 tied to a write-enable signal and OE2 to a chip-select, enabling independent control of buffer directionality without external logic.
Can SN74ALS541DBR be used in place of SN74ALS240A?
While the SN74ALS541DBR matches the performance of the SN74ALS240A series, it is not pin-compatible due to its data flowthrough pinout (inputs and outputs on opposite sides). The SN74ALS240A uses a mixed-side layout. Direct substitution requires PCB layout revision; however, logic function, timing, and drive strength are equivalent for system-level validation.
What is the meaning of "G541" marking on the SN74ALS541DBR package?
"G541" is the top-side marking laser-etched on the SN74ALS541DBR device, as specified in TI's packaging documentation. It identifies the base part number (ALS541) and distinguishes it from variants like ALS540 or -1 versions (marked "G541-1"). This marking is consistent across all SSOP-packaged SN74ALS541 units and aligns with TI's standard logic family coding convention.
SN74ALS541DBR 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:
- 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, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
SN74ALS541DBR FAQ
1.How can I place an order for SN74ALS541DBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS541DBR 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 SN74ALS541DBR reliable?
The price and inventory of SN74ALS541DBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS541DBR is usually 5 days.
3.What payment methods are accepted for SN74ALS541DBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS541DBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS541DBR?
SN74ALS541DBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS541DBR 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 SN74ALS541DBR?
For technical support, including SN74ALS541DBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS541DBR requirements.
6.How does Aetrix verify that SN74ALS541DBR is sourced from the original manufacturer or authorized distributors?
All SN74ALS541DBR 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 SN74ALS541DBR meets industry standards.
7.What is the process for return or replacement of SN74ALS541DBR?
All SN74ALS541DBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS541DBR, 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 SN74ALS541DBR part is unused and in its original packaging.
Return procedure for SN74ALS541DBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74ALS541DBR 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…
