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Texas Instruments SN74HC541NSR
- Part No.:
- SN74HC541NSR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74HC541NSR.pdf
- Description:
- IC BUFFER NON-INVERT 6V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,792
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Product details
Overview
SN74HC541NSR from Texas Instruments is an octal non-inverting 3-state buffer/line driver IC used for bus interfacing and signal isolation in digital systems. It operates from 2 V to 6 V, delivers ±6 mA output drive at 5 V, exhibits typical propagation delay of 10 ns (VCC = 6 V, CL = 50 pF), and features dual active-low output-enable inputs (OE1, OE2) for synchronized high-impedance control. It is commonly deployed in PC motherboard I/O expansion and server backplane buffering.
For engineers reviewing the SN74HC541NSR datasheet, SN74HC541NSR pinout, SN74HC541NSR application, or SN74HC541NSR equivalent, key selection considerations include its wide 2–6 V supply range, true-buffer logic (non-inverting), 20-pin SO package with input/output separation for PCB layout simplification, and compatibility with LSTTL load driving (up to 15 loads).
Technical Context
The SN74HC541NSR implements eight independent non-inverting buffers, each with output controlled by a two-input NOR gate formed by OE1 and OE2 - both must be low to enable outputs; either high forces all Y outputs into high-impedance state. Its CMOS design ensures low static current (80 µA max ICC) and high noise immunity across the full 2–6 V operating range.
Pinout follows data flow-through architecture: all eight A inputs occupy pins 2–9 on one side, all eight Y outputs occupy pins 11–18 on the opposite side, with OE1 (pin 1), OE2 (pin 19), VCC (pin 20), and GND (pin 10) positioned to support clean routing. This layout minimizes trace crosstalk and simplifies layer stack-up in dense digital boards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 6 V - supports direct interface with mixed-voltage logic domains (e.g., 3.3 V microcontrollers driving 5 V peripherals) |
| Output Drive Capability | ±6 mA at 5 V - sufficient to directly drive 15 LSTTL loads or standard LEDs without external transistors |
| Propagation Delay (tpd) | 10 ns typical (VCC = 6 V, CL = 50 pF) - enables reliable operation in 25 MHz+ address/data bus applications |
| Quiescent Current (ICC) | 80 µA maximum - suitable for low-power embedded systems and battery-backed subsystems |
| Input Leakage Current | ±1 µA maximum - ensures stable logic levels even with high-impedance pull-ups or long traces |
| 3-State Enable Logic | Active-low dual OE (OE1 AND OE2) - provides fault-tolerant disable control; either OE high disables all outputs |
Pinout & Package
SN74HC541NSR is housed in a 20-pin SOP (Small Outline Package) with nominal body size 12.60 mm × 5.30 mm, gull-wing leads, and RoHS-compliant NiPdAu finish. It is rated for industrial temperature range (–40°C to +85°C) and has moisture sensitivity level (MSL) 1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE1 | Active-low output enable input; must be low (with OE2) to assert Y outputs |
| 2–9 | A1–A8 | Buffer input terminals; accept TTL- or CMOS-level signals; non-inverting path to Y1–Y8 |
| 10 | GND | Ground reference for all internal circuitry and output current return path |
| 11–18 | Y1–Y8 | 3-state buffered outputs; high-impedance when either OE1 or OE2 is high |
| 19 | OE2 | Second active-low output enable input; OR'd with OE1 for fail-safe disable |
| 20 | VCC | Positive supply rail; bypass capacitor (0.1 µF) required adjacent to pin for noise suppression |
Key Features
| Feature | Design Value |
|---|---|
| Data flow-through pinout | Inputs (A1–A8) and outputs (Y1–Y8) on opposite sides of package - reduces PCB trace length and crosstalk in bus routing |
| Dual output-enable control | OE1 and OE2 both active-low and logically OR'd - prevents accidental output assertion during power sequencing |
| High-current 3-state outputs | ±6 mA drive capability at 5 V - eliminates need for discrete buffer stages when interfacing with legacy TTL loads |
| Low power consumption | 80 µA max ICC - enables use in always-on monitoring circuits without thermal or battery-life penalty |
| Wide voltage compatibility | 2–6 V operation - allows single part to serve 2.5 V, 3.3 V, and 5 V system domains without level shifters |
Applications
| PC Motherboard I/O Expansion | Industrial PLC Backplane Buffering |
|---|---|
|
Use Scenario: Isolating and driving parallel I/O lines (e.g., GPIO expanders, keyboard controllers) from a 3.3 V host CPU to 5 V peripheral modules. IC Role / Device Role: Non-inverting 3-state buffer providing voltage-domain translation and bus contention protection. Use Value: Enables direct connection without level shifters; dual OE pins allow synchronized disable during CPU reset or hot-swap events. |
Use Scenario: Driving multiple sensor input channels or relay driver banks on a modular PLC backplane operating at 5 V. IC Role / Device Role: Octal line driver with high sink/source capability, ensuring robust signal integrity across noisy industrial environments. Use Value: ±6 mA output drive sustains signal integrity over 15 cm ribbon cables; 84.6°C/W RθJA supports operation in enclosed cabinets up to 70°C ambient. |
| LED Status Indication Arrays | Legacy Bus Interface Adapters |
|
Use Scenario: Driving 8 discrete status LEDs on medical device front panels powered from a 5 V rail. IC Role / Device Role: Current-sourcing/sinking buffer replacing discrete transistor arrays for compact LED control. Use Value: Eliminates 16 external components; built-in 3-state allows dynamic multiplexing or blanking via OE control. |
Use Scenario: Interfacing modern microcontrollers (3.3 V) to legacy ISA or LPC bus peripherals requiring 5 V signaling and TTL-compatible loading. IC Role / Device Role: Bidirectional-capable unidirectional buffer enabling safe, isolated communication with legacy hardware. Use Value: 15-LSTTL load drive meets ISA bus fan-out requirements; wide VCC range accommodates mixed-supply adapter designs. |
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 |
|---|---|---|---|
| SN74HCT541NSR | CMOS input with TTL-compatible thresholds (VIH = 2.0 V min); identical pinout and drive strength | Better suited for direct interface with 5 V TTL logic without level shifting; slightly higher ICC (160 µA) | Select when interfacing with legacy 5 V TTL sources where input voltage margins are marginal |
| 74LCX541MTCX | Lower VCC range (2.0–3.6 V); 24 mA drive at 3.3 V; different pinout (no OE1/OE2 split) | Optimized for 3.3 V-only systems; not compatible with 5 V buses or mixed-voltage operation | Choose only for pure 3.3 V low-power designs where 5 V tolerance is unnecessary |
Compared with SN74HC541NSR, SN74HCT541NSR offers improved input compatibility with 5 V TTL but trades off quiescent current, while 74LCX541MTCX sacrifices voltage flexibility for higher speed and lower power in 3.3 V domains - neither is pin-compatible replacement without layout revision.
Availability
SN74HC541NSR is available at Aetrix Electronics and suitable for PC motherboard I/O expansion, industrial PLC backplane buffering, and LED status indication arrays requiring stable component supply and industrial-temperature-grade reliability.
Supply support for SN74HC541NSR 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 company specializing in analog and embedded processing technologies, with leadership in logic, power management, and interface solutions.
SN74HC541NSR belongs to the SNx4HC541 family of octal 3-state buffers designed for robust bus interfacing, signal isolation, and mixed-voltage system integration in computing, industrial control, and consumer electronics.
FAQ
What is the operating temperature range for SN74HC541NSR?
The SN74HC541NSR is specified for industrial operation from –40°C to +85°C. This range is validated per TI's production test conditions and supports deployment in enclosed industrial enclosures, automotive under-hood auxiliary modules, and commercial computing equipment without derating.
Does SN74HC541NSR support 3.3 V logic systems?
Yes, SN74HC541NSR fully supports 3.3 V operation: VIH is guaranteed ≥2.0 V at VCC = 3.3 V, and VOL remains ≤0.33 V at IOL = 6 mA. Its 2–6 V supply range makes it interoperable with 3.3 V microcontrollers, FPGAs, and ASICs without level translation.
How are the output-enable pins OE1 and OE2 used in SN74HC541NSR?
In SN74HC541NSR, both OE1 and OE2 are active-low inputs logically OR'd internally - if either is high, all eight Y outputs enter high-impedance state. This dual-control scheme improves system safety during power-up/down sequences and enables redundant disable signaling in fault-tolerant designs.
Can SN74HC541NSR drive standard LEDs directly?
Yes, SN74HC541NSR can drive standard 20 mA LEDs directly in sink configuration: at VCC = 5 V, it delivers 6 mA continuous output current per channel, sufficient for low-current indicator LEDs (e.g., 2 mA @ 2.1 V forward voltage). For higher-brightness LEDs, external current-limiting resistors must be sized accordingly.
What is the thermal resistance (RθJA) of SN74HC541NSR in its SO package?
The junction-to-ambient thermal resistance (RθJA) for SN74HC541NSR in the SO (NS) package is 113.4°C/W, measured per JEDEC JESD51 standards on a 1-layer 1-oz copper board. This value assumes standard PCB layout; actual thermal performance improves with added copper pour or thermal vias.
SN74HC541NSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-SOIC (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:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
SN74HC541NSR FAQ
1.How can I place an order for SN74HC541NSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC541NSR 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 SN74HC541NSR reliable?
The price and inventory of SN74HC541NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC541NSR is usually 5 days.
3.What payment methods are accepted for SN74HC541NSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC541NSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC541NSR?
SN74HC541NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC541NSR 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 SN74HC541NSR?
For technical support, including SN74HC541NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC541NSR requirements.
6.How does Aetrix verify that SN74HC541NSR is sourced from the original manufacturer or authorized distributors?
All SN74HC541NSR 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 SN74HC541NSR meets industry standards.
7.What is the process for return or replacement of SN74HC541NSR?
All SN74HC541NSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC541NSR, 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 SN74HC541NSR part is unused and in its original packaging.
Return procedure for SN74HC541NSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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