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Texas Instruments SN74HCT541NSR
- Part No.:
- SN74HCT541NSR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74HCT541NSR.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:346
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Product details
Overview
SN74HCT541NSR from Texas Instruments is an octal non-inverting buffer/line driver with 3-state outputs, designed for bus interface and load-driving applications in 5-V TTL-compatible digital systems. It operates from 4.5 V to 5.5 V, delivers ±6 mA output drive at 5 V, exhibits typical propagation delay of 12 ns, and supports up to 15 LSTTL loads.
For engineers reviewing the SN74HCT541NSR datasheet, SN74HCT541NSR pinout, SN74HCT541NSR application, or SN74HCT541NSR equivalent, key selection criteria include 3-state control architecture (dual OE inputs), data flow-through pinout for PCB layout optimization, low ICC (80 µA max), TTL-compatible input thresholds, and SO package thermal performance (RθJA = 113.4 °C/W).
Technical Context
The SN74HCT541NSR implements eight independent non-inverting buffers, each with true (non-inverted) output logic. Its 3-state enable logic uses a dual-input NOR gate: either OE1 or OE2 high forces all eight Y outputs into high-impedance mode.
It belongs to the HCT logic family-CMOS technology with TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V at VCC = 4.5–5.5 V)-ensuring interoperability with legacy TTL buses while delivering CMOS-level power efficiency and noise immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5-V digital rails and tolerant of nominal supply variation. |
| Output Drive | ±6 mA at 5 V - sufficient to directly drive 15 LSTTL loads without external buffering. |
| Propagation Delay | 12 ns typical (VCC = 5.5 V, CL = 50 pF) - enables reliable operation in medium-speed bus timing budgets. |
| Quiescent Current | 80 µA max - ensures minimal static power draw in always-on or standby system nodes. |
| Input Compatibility | TTL-voltage compatible (VIH = 2 V, VIL = 0.8 V) - interoperable with 74LS, 74F, and other legacy TTL families. |
| 3-State Enable Logic | NOR-gated dual OE inputs - either OE1 or OE2 high disables all outputs simultaneously, simplifying bus arbitration control. |
Pinout & Package
SOP (SO) 20-pin package, 15.00 mm × 5.30 mm body size, 1.27 mm lead pitch, gull-wing leads, RoHS-compliant NIPDAU finish, MSL Level-1 (260 °C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Inputs A1–A8 | True logic inputs driving corresponding Y outputs; placed on left side for flow-through layout. |
| 9, 19 | OE1, OE2 | Active-low 3-state enable inputs (NOR logic); assertion of either disables all outputs. |
| 10, 20 | GND, VCC | Power reference and supply pins; decoupling capacitor must be placed near Pin 10 (GND) and Pin 20 (VCC). |
| 11–18 | Outputs Y1–Y8 | Non-inverting buffered outputs; placed on right side opposite inputs to minimize trace crosstalk and simplify routing. |
Key Features
| Feature | Design Value |
|---|---|
| Data flow-through pinout | Inputs (A1–A8) on left, outputs (Y1–Y8) on right - reduces layer count and signal crossing in dense PCB layouts. |
| Dual 3-state enable (OE1/OE2) | NOR-gated control allows flexible bus arbitration using either single or complementary enable signals. |
| TTL-compatible input thresholds | VIH = 2 V, VIL = 0.8 V - eliminates need for level-shifting when interfacing with legacy 5-V TTL logic. |
| Low ICC and IOZ | 80 µA max ICC and 0.5 µA max IOZ - minimizes standby current in power-sensitive applications like industrial controllers. |
| High-output current capability | ±6 mA per output at 5 V - drives heavy capacitive loads or multiple downstream gates without fanout limitation. |
Applications
| Industrial PLC Backplane Interface | Legacy System Bus Extension |
|---|---|
Use Scenario: Interfacing microcontroller I/O ports to a 24-V industrial backplane with long trace runs and EMI exposure. IC Role / Device Role / Timing Role: Octal buffer isolates MCU from bus transients while providing robust drive strength and 3-state control for multi-master arbitration. Use Value: ±6 mA drive and TTL-compatible inputs ensure reliable signal integrity across noisy environments without additional level shifters or drivers. | Use Scenario: Extending a vintage 74LS-based address/data bus in retro-computing or test equipment upgrades. IC Role / Device Role / Timing Role: Non-inverting buffer translates LS logic levels to HCT-compatible thresholds while preserving timing alignment via 12-ns tpd. Use Value: Eliminates need for discrete resistor networks or active translators, reducing BOM count and board area. |
| Embedded Controller I/O Expansion | Test Fixture Signal Conditioning |
Use Scenario: Adding GPIO capacity to an ARM Cortex-M4-based motor controller where unused pins are routed to a header bank. IC Role / Device Role / Timing Role: Buffers isolate MCU pins from external connectors and provide 3-state capability for shared bus access during firmware updates. Use Value: Dual OE inputs allow synchronized disable of all outputs during hot-plug events, preventing bus contention. | Use Scenario: Building a programmable test fixture that routes DUT signals through configurable logic paths before measurement. IC Role / Device Role / Timing Role: Line driver conditions signals for scope probes or logic analyzers, with 3-state outputs enabling multiplexed channel selection. Use Value: Low 80-µA ICC and 0.5-µA IOZ minimize fixture self-loading, preserving signal fidelity during high-impedance measurements. |
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 |
|---|---|---|---|
| SN74HCT240NSR | Inverting outputs; dual OE with NAND-enable logic (active-high enable, both OE low required). | Requires logic inversion in signal path; suited for active-low bus control schemes. | Select when inverted polarity is needed or when existing design uses HCT240 footprint and logic. |
| SN74LVC541APW | 3.3-V only (1.65–3.6 V); higher speed (tPD = 5.1 ns); lower drive (±24 mA); different pinout. | Not voltage-compatible with 5-V systems; requires level translation if mixed-voltage design. | Choose for new 3.3-V designs prioritizing speed and lower power, not for drop-in 5-V replacement. |
Compared with SN74HCT240NSR and SN74LVC541APW, the SN74HCT541NSR uniquely provides true (non-inverting) outputs with NOR-gated 3-state control in a 5-V TTL-compatible package-making it optimal for bus extension, backplane isolation, and legacy system upgrades where signal polarity and voltage compatibility are critical.
Availability
SN74HCT541NSR is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy system bus extensions, and embedded controller I/O expansion requiring stable component supply and long-term manufacturability.
Supply support for SN74HCT541NSR 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 specializing in analog, embedded processing, and logic solutions, with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74HCT541NSR belongs to TI's HCT logic family-designed specifically for seamless integration between modern CMOS systems and legacy 5-V TTL infrastructure, emphasizing reliability, interoperability, and ease of PCB layout.
FAQ
What is the maximum operating temperature range for the SN74HCT541NSR?
The SN74HCT541NSR is rated for operation from –40 °C to +85 °C ambient temperature. This industrial-grade range ensures reliable performance in factory automation, motor control, and outdoor embedded applications where thermal cycling and extended temperature exposure occur. The SO package's RθJA of 113.4 °C/W supports this rating under typical PCB copper pour conditions.
Does the SN74HCT541NSR require external pull-up or pull-down resistors on its OE inputs?
No, the SN74HCT541NSR does not require external pull-up or pull-down resistors on OE1 or OE2. Its inputs have CMOS structure with ≤1 µA max input current, and the device functions correctly when OE inputs are driven actively high or low. However, unused OE inputs must be tied to GND or VCC-not left floating-to prevent undefined output states per TI application guidance.
Can the SN74HCT541NSR drive a 50-pF load with guaranteed timing at 5.5 V?
Yes, the SN74HCT541NSR guarantees tpd ≤31 ns and ten/tdis ≤41 ns when driving a 50-pF load at VCC = 5.5 V and TA = 25 °C, per Section 5.5 of the official datasheet. These values remain within specification across the full industrial temperature range when derated per TI's switching characteristics curves.
Is the SN74HCT541NSR pin-compatible with other packages in the SN74HCT541 family?
Yes, the SN74HCT541NSR shares identical pinout and function with all other SN74HCT541 variants-including SN74HCT541N (PDIP), SN74HCT541DWR (SOIC), and SN74HCT541PWR (TSSOP). All use the same 20-pin functional assignment: A1–A8, OE1/OE2, GND/VCC, Y1–Y8-enabling direct package substitution without PCB redesign.
What is the recommended bypass capacitor for the SN74HCT541NSR?
Texas Instruments recommends a 0.1-µF ceramic capacitor placed as close as possible to Pin 20 (VCC) and Pin 10 (GND) to suppress high-frequency supply noise. For enhanced broadband filtering, a parallel 1-µF capacitor may be added-especially in systems with multiple logic devices sharing the same rail-without compromising stability or layout compactness.
SN74HCT541NSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- 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:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
SN74HCT541NSR FAQ
1.How can I place an order for SN74HCT541NSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCT541NSR 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 SN74HCT541NSR reliable?
The price and inventory of SN74HCT541NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCT541NSR is usually 5 days.
3.What payment methods are accepted for SN74HCT541NSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HCT541NSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HCT541NSR?
SN74HCT541NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCT541NSR 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 SN74HCT541NSR?
For technical support, including SN74HCT541NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCT541NSR requirements.
6.How does Aetrix verify that SN74HCT541NSR is sourced from the original manufacturer or authorized distributors?
All SN74HCT541NSR 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 SN74HCT541NSR meets industry standards.
7.What is the process for return or replacement of SN74HCT541NSR?
All SN74HCT541NSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCT541NSR, 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 SN74HCT541NSR part is unused and in its original packaging.
Return procedure for SN74HCT541NSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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