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Texas Instruments SN74HC541NG4
- Part No.:
- SN74HC541NG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74HC541NG4.pdf
- Description:
- IC BUFFER NON-INVERT 6V 20DIP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74HC541NG4 from Texas Instruments is an octal non-inverting buffer/line driver with 3-state outputs, designed for bus interface 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 precise bus control - commonly used in PC motherboard I/O expansion and industrial control backplanes.
For engineers reviewing the SN74HC541NG4 datasheet, SN74HC541NG4 pinout, SN74HC541NG4 application, or SN74HC541NG4 equivalent, key selection considerations include its wide supply range (2–6 V), high-current 3-state outputs capable of driving up to 15 LSTTL loads, low ICC (80 µA max), data-flow-through pinout for simplified PCB routing, and compatibility with legacy 74HC logic families.
Technical Context
The SN74HC541NG4 implements eight independent non-inverting buffers, each with true (non-inverted) input-to-output mapping. Its 3-state outputs are controlled by a two-input NOR gate: both OE1 and OE2 must be low to enable outputs; either high forces all Y1–Y8 into high-impedance state.
This device uses silicon-gate CMOS technology, ensuring low static power consumption and high noise immunity. Input thresholds scale with VCC (VIH = 0.7×VCC min, VIL = 0.3×VCC max), and output voltage levels meet HC logic standards across the full 2–6 V operating range - enabling interoperability with mixed-voltage systems including 3.3 V microcontrollers and 5 V peripherals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 6 V - supports direct interfacing between 3.3 V and 5 V logic domains without level shifters. |
| Output Drive Current | ±6 mA at 5 V - sufficient to directly drive 15 LSTTL loads or LED segments without external transistors. |
| Propagation Delay (tpd) | 10 ns typical at VCC = 6 V, CL = 50 pF - enables reliable operation in 25 MHz+ synchronous bus environments. |
| Quiescent Supply Current (ICC) | 80 µA maximum - minimizes standby power in battery-backed or energy-sensitive applications. |
| Input Leakage Current | ±1 µA maximum - ensures stable logic states even with high-impedance pull-ups or long trace runs. |
| 3-State Enable Logic | Active-low dual OE (OE1, OE2) with NOR function - provides redundant enable control and fail-safe high-Z default on power-up if tied via pull-up resistors. |
| Input Capacitance (Ci) | 10 pF maximum - limits capacitive loading on upstream drivers and preserves signal integrity at high frequencies. |
Pinout & Package
SN74HC541NG4 is supplied in a 20-pin PDIP (Plastic Dual In-line Package) with 0.300-inch body width and standard through-hole mounting. Pin spacing is 0.100 inch, compatible with industry-standard IC sockets and wave-soldering processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-low output enable inputs - both must be low for Y1–Y8 to reflect A1–A8; either high places all outputs in high-impedance state. |
| 2–9 | A1–A8 | Buffer input terminals - accept CMOS-level signals; inputs must be held high or low (no floating) per design guidelines. |
| 10 | GND | Ground reference - single ground pin shared by all buffers; requires low-inductance connection to system ground plane. |
| 11–18 | Y1–Y8 | True (non-inverted) 3-state outputs - electrically isolated when OE1/OE2 high; sink/source up to ±6 mA at 5 V. |
| 20 | VCC | Positive supply terminal - must be bypassed with ≥0.1 µF ceramic capacitor placed adjacent to pin for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Data-flow-through pinout | Inputs (A1–A8, OE1, OE2) on left side; outputs (Y1–Y8) on right side - eliminates layer crossings and reduces PCB trace length in bus architectures. |
| Wide voltage operation | 2 V to 6 V supply range - allows single part number to serve both 3.3 V embedded controllers and legacy 5 V industrial systems. |
| High-current 3-state outputs | ±6 mA drive capability at 5 V - eliminates need for discrete buffer stages when interfacing to moderate-load buses or indicator LEDs. |
| Low power consumption | 80 µA max ICC - enables use in always-on subsystems where quiescent current budget is constrained (e.g., real-time clocks, watchdog circuits). |
| CMOS input compatibility | Input leakage ≤1 µA and rail-to-rail VIH/VIL thresholds - ensures robust operation with high-impedance sources and prevents false triggering in noisy environments. |
Applications
| PC Motherboard I/O Expansion | Industrial PLC Backplane Interface |
|---|---|
|
Use Scenario: Isolating and buffering parallel address/data lines between a microcontroller and peripheral expansion slots on a custom PC-compatible motherboard. IC Role / Device Role: Octal non-inverting buffer with 3-state control - enables bidirectional bus sharing and prevents signal contention during DMA transfers. Use Value: Dual OE inputs allow synchronized enable/disable of all eight channels, supporting clean bus arbitration without timing skew between lanes. |
Use Scenario: Driving relay driver arrays and opto-isolator inputs from a programmable logic controller's digital output module. IC Role / Device Role: High-current line driver - translates low-power MCU GPIO signals into robust 6 mA outputs capable of directly energizing 5 V coil relays. Use Value: ±6 mA output drive at 5 V eliminates need for external transistor stages, reducing BOM count and board area in space-constrained DIN-rail modules. |
| LED Status Panel Driver | Legacy System Bus Isolation |
|
Use Scenario: Driving 8-segment LED status indicators on medical diagnostic equipment front panels using 3.3 V MCU GPIOs. IC Role / Device Role: Level-shifting buffer - accepts 3.3 V logic inputs and delivers 5 V-compatible output swing to ensure full LED brightness across varying supply tolerances. Use Value: 2–6 V operation allows direct 5 V VCC supply while accepting 3.3 V inputs, avoiding dedicated level translators and simplifying power domain management. |
Use Scenario: Electrically isolating a modern ARM-based controller from a legacy 5 V ISA bus in retro-computing hardware emulation platforms. IC Role / Device Role: Unidirectional bus buffer - prevents back-driving and voltage conflict between mismatched logic families during hot-plug events. Use Value: High-impedance 3-state outputs activated via OE pins provide safe bus release during reset or firmware update, protecting connected peripherals. |
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 |
|---|---|---|---|
| SN74HCT541N | TTL-compatible input thresholds (VIH = 2 V min, VIL = 0.8 V max) vs. HC's VCC-scaled thresholds; otherwise identical pinout, drive, and timing. | Better suited for interfacing with 5 V TTL or LS logic; less tolerant of undershoot/noise on inputs than HC variant. | Select SN74HCT541N when connecting to legacy 5 V TTL buses; choose SN74HC541NG4 for pure CMOS systems or mixed 3.3 V/5 V designs requiring rail-scaled thresholds. |
| 74LCX541M | Lower VCC range (2.0–3.6 V), higher speed (tpd = 5.5 ns @ 3.3 V), and 5 V-tolerant inputs - not pin-compatible due to different pin assignment (e.g., OE shared, not dual). | Optimized for 3.3 V-only systems with strict timing budgets; incompatible with 5 V operation or SN74HC541NG4's dual-OE control scheme. | Use 74LCX541M only in new 3.3 V designs requiring sub-6 ns delays; SN74HC541NG4 remains preferred for 2–6 V flexibility, dual-OE safety, and drop-in replacement in existing HC-based layouts. |
Compared with SN74HCT541N and 74LCX541M, SN74HC541NG4 uniquely balances wide voltage operation (2–6 V), dual independent output enables, and proven layout-friendly pinout - making it the most versatile choice for legacy upgrades, mixed-voltage interfaces, and cost-sensitive industrial controls where design reuse and supply margin are critical.
Availability
SN74HC541NG4 is available at Aetrix Electronics and suitable for PC motherboard I/O expansion, industrial PLC backplane interface, and LED status panel driver applications requiring stable component supply across extended production lifecycles.
Supply support for SN74HC541NG4 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 50 years of innovation in industrial, automotive, and communications markets.
The SN74HC541NG4 belongs to TI's 74HC logic family - engineered for high noise immunity, low power, and seamless interoperability across voltage domains in industrial control, computing, and instrumentation systems.
FAQ
What is the recommended power supply bypassing for SN74HC541NG4?
TI recommends placing a 0.1 µF ceramic capacitor between VCC (pin 20) and GND (pin 10), mounted as close as possible to the package. This minimizes high-frequency noise coupling and stabilizes supply voltage during output switching transitions. For systems with multiple SN74HC541NG4 devices, individual local bypassing is preferred over shared bulk capacitance to prevent crosstalk.
Can SN74HC541NG4 operate reliably at 3.3 V supply?
Yes, SN74HC541NG4 is fully specified from 2 V to 6 V, including 3.3 V operation. At VCC = 3.3 V, it delivers ±4 mA output drive, maintains VIH ≥ 2.31 V and VIL ≤ 0.99 V, and achieves typical tpd ≈ 15 ns (CL = 50 pF). All electrical characteristics in Section 6.7 of the datasheet confirm guaranteed performance across this range.
How should unused inputs be handled on SN74HC541NG4?
All unused inputs - including A1–A8 and OE1/OE2 - must be tied to a valid logic level (VCC or GND) to prevent floating states that cause excessive ICC, oscillation, or undefined outputs. OE pins should be pulled up to VCC via 10 kΩ resistors to ensure high-impedance default on power-up; unused A inputs may be tied to GND or VCC depending on required default output state.
Does SN74HC541NG4 support hot-swap or live-insertion?
SN74HC541NG4 is not rated for hot-swap operation. Its absolute maximum ratings specify no input voltage beyond VCC or below GND, and ESD protection (±2000 V HBM) does not cover insertion-induced transients. For live-insertion applications, external series resistors and clamping diodes are required to limit current and voltage excursions during mating.
What is the thermal resistance (RθJA) of SN74HC541NG4 in PDIP package?
The junction-to-ambient thermal resistance (RθJA) for SN74HC541NG4 in the PDIP (N) package is 84.6 °C/W, as specified in Section 6.4 of the datasheet. This value assumes standard JEDEC 2-layer board conditions; actual thermal performance improves with copper pour, thermal vias, or forced airflow in production layouts.
SN74HC541NG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN74HC541NG4 FAQ
1.How can I place an order for SN74HC541NG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC541NG4 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 SN74HC541NG4 reliable?
The price and inventory of SN74HC541NG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC541NG4 is usually 5 days.
3.What payment methods are accepted for SN74HC541NG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC541NG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC541NG4?
SN74HC541NG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC541NG4 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 SN74HC541NG4?
For technical support, including SN74HC541NG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC541NG4 requirements.
6.How does Aetrix verify that SN74HC541NG4 is sourced from the original manufacturer or authorized distributors?
All SN74HC541NG4 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 SN74HC541NG4 meets industry standards.
7.What is the process for return or replacement of SN74HC541NG4?
All SN74HC541NG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC541NG4, 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 SN74HC541NG4 part is unused and in its original packaging.
Return procedure for SN74HC541NG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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