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Texas Instruments SN74HC541PWT
- Part No.:
- SN74HC541PWT
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74HC541PWT.pdf
- Description:
- IC BUFFER NON-INVERT 6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,202
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Product details
Overview
SN74HC541PWT 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 precise bus control - commonly deployed in PC motherboard I/O expansion and industrial controller backplanes.
For engineers reviewing the SN74HC541PWT datasheet, SN74HC541PWT pinout, SN74HC541PWT application, or SN74HC541PWT equivalent, this page provides verified technical context, package-specific pin functions, real-world application mappings, and validated alternative options for bus buffering in 5 V and mixed-voltage logic systems.
Technical Context
The SN74HC541PWT implements eight independent non-inverting buffers with true outputs and dual NOR-gated 3-state control: both OE1 and OE2 must be low to enable all Y outputs; either high forces all outputs into high-impedance. Its data-flow-through pinout places all eight A inputs on one side (pins 2–9) and corresponding Y outputs on the opposite side (pins 11–18), minimizing PCB trace crossovers.
It uses standard HC CMOS technology with rail-to-rail input thresholds, supports up to 15 LSTTL loads per output, and maintains low ICC (≤80 µA max) across its full 2–6 V operating range. Input leakage is ≤1 µA, and output off-state leakage (IOZ) is ≤0.5 µA at 6 V - critical for low-power hold states in battery-backed systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 6 V - enables direct interface with 3.3 V microcontrollers and legacy 5 V TTL buses without level shifters. |
| Output Drive Capability | ±6 mA at VCC = 5 V - sufficient to directly drive 15 LSTTL loads or LED segments without external transistors. |
| Propagation Delay (tpd) | 10 ns typical (VCC = 6 V, CL = 50 pF) - supports reliable operation in 25 MHz+ address/data bus timing windows. |
| 3-State Enable Logic | NOR-gated dual OE (OE1, OE2) - both must be low for output enable; single-pin fault tolerance prevents accidental bus contention. |
| Input Leakage Current | ≤1 µA max - ensures stable logic levels even with high-impedance pull-ups or long PCB traces. |
| Quiescent Supply Current | ≤80 µA max (VCC = 6 V) - suitable for always-on monitoring circuits in energy-constrained embedded designs. |
Pinout & Package
TSSOP-20 (PW) package: 6.50 mm × 4.40 mm body, 0.65 mm pitch, thin-profile surface-mount design optimized for high-density PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-low 3-state enable inputs - tied together or independently controlled to gate all eight outputs simultaneously or in groups. |
| 2–9 | A1–A8 | Buffer input terminals - accept CMOS/TTL-compatible signals; must be held high or low when unused to prevent floating inputs. |
| 10 | GND | Ground reference - requires low-inductance connection to system ground plane to minimize switching noise coupling. |
| 11–18 | Y1–Y8 | Non-inverting buffered outputs - present true logic state of corresponding A inputs when enabled; high-Z otherwise. |
| 20 | VCC | Positive supply - requires local 0.1 µF ceramic bypass capacitor placed within 2 mm of pin for stable high-speed operation. |
Key Features
| Feature | Design Value |
|---|---|
| Data-flow-through pinout | Inputs (A1–A8) on left side, outputs (Y1–Y8) on right side - eliminates layer jumps and reduces routing congestion on 2-layer PCBs. |
| Dual output-enable architecture | Independent OE1/OE2 pins allow synchronized or staggered bus release in multi-master systems to avoid glitches. |
| Wide voltage compatibility | 2–6 V operation supports direct integration into mixed-supply systems (e.g., 3.3 V MCU + 5 V peripheral bus). |
| Low power consumption | 80 µA max ICC enables use in standby modes where total system current must stay below 100 µA. |
| High noise immunity | CMOS input thresholds (VIH ≥ 3.15 V @ 4.5 V) reject >0.8 V of ground bounce or supply ripple on shared PCB planes. |
Applications
| PC Motherboard I/O Expansion | Industrial PLC Backplane Interface |
|---|---|
Use Scenario: Isolating legacy parallel port or ISA-style address/data lines between CPU module and expansion slots. IC Role / Device Role / Timing Role: Bidirectional bus buffer with 3-state control, enabling CPU to read/write peripheral registers without contention. Use Value: Prevents signal integrity degradation across 10+ cm backplane traces by driving capacitive loads up to 15 LSTTL units per channel. |
Use Scenario: Interfacing microcontroller GPIO banks to isolated I/O modules in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Level-shifting and fan-out buffer for 24 V digital input conditioning circuits and relay driver banks. Use Value: Enables single 5 V MCU to safely control eight independent 24 V opto-isolated inputs via open-collector interface. |
| Wearable Health Sensor Hub | Electronic Point-of-Sale Terminal |
Use Scenario: Multiplexing sensor data streams (ECG, SpO₂, temperature) onto a shared SPI or parallel bus before MCU sampling. IC Role / Device Role / Timing Role: Low-power signal gating element that isolates inactive sensor channels to reduce system leakage current. Use Value: Achieves <1 µA standby current per channel using OE-controlled high-Z state - extends battery life in coin-cell-powered devices. |
Use Scenario: Driving customer-facing LED indicators and receipt printer control lines from a compact ARM-based POS controller. IC Role / Device Role / Timing Role: High-current buffer stage between low-drive MCU pins and 20 mA LED arrays or solenoid drivers. Use Value: Eliminates need for discrete transistor arrays, reducing BOM count and board area in space-constrained retail hardware. |
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 |
|---|---|---|---|
| SN74HCT541PW | CMOS input thresholds compatible with TTL logic levels (VIH = 2 V min); identical pinout and drive strength. | Better suited for mixed 5 V TTL/CMOS systems where upstream drivers lack full CMOS swing. | Select when interfacing with older 74LS or 74F logic families without level translators. |
| 74LVC541APW | Lower VCC range (1.65–3.6 V), higher speed (tpd = 5.2 ns @ 3.3 V), but reduced drive (±24 mA @ 3.3 V). | Optimized for modern 3.3 V-only portable electronics; not 5 V tolerant on inputs or outputs. | Choose for new 3.3 V designs requiring faster timing and lower power, with no 5 V interface requirements. |
Compared with SN74HC541PWT, SN74HCT541PW offers TTL-compatible inputs for legacy interoperability, while 74LVC541APW delivers superior speed and efficiency in pure 3.3 V domains - neither is pin-compatible with 5 V operation or mixed-voltage tolerance of the HC variant.
Availability
SN74HC541PWT is available at Aetrix Electronics and suitable for PC motherboard I/O expansion, industrial PLC backplane interface, and electronic point-of-sale terminals requiring stable component supply across extended production lifecycles.
Supply support for SN74HC541PWT 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 computing applications.
The SN74HC541PWT belongs to TI's HC logic family - designed for robust, low-power, wide-voltage-range digital interfacing in cost-sensitive, high-reliability systems where bus isolation and signal integrity are critical.
FAQ
What is the operating voltage range of the SN74HC541PWT?
The SN74HC541PWT operates from 2 V to 6 V DC. This wide range allows direct compatibility with 3.3 V microcontrollers, 5 V legacy peripherals, and mixed-supply systems without external level-shifting circuitry. The device meets all electrical specifications across this full range, including output drive, propagation delay, and input threshold behavior - confirmed in TI's SCLS305E datasheet Section 6.3.
How does the dual output-enable (OE1/OE2) logic work on the SN74HC541PWT?
The SN74HC541PWT uses a NOR-gated enable structure: both OE1 and OE2 must be low to activate the eight Y outputs; if either is high, all outputs enter high-impedance state. This architecture prevents accidental bus contention during power-up/down sequences and supports redundant enable control in fault-tolerant designs - detailed in the functional table (Section 8.4) and pin function description (Section 5) of the SN74HC541PWT datasheet.
Can the SN74HC541PWT drive LEDs directly?
Yes, the SN74HC541PWT can drive standard indicator LEDs directly: each output delivers ±6 mA at 5 V, sufficient for 2–5 mA LED segments with appropriate current-limiting resistors. Its 0.26 V VOL (max, IOL = 6 mA) ensures strong low-side switching, and the 3-state capability allows dynamic multiplexing - as validated in TI's Application Note SCLA015 and Typical Application Figure 9-1 for the SN74HC541PWT.
What is the typical propagation delay of the SN74HC541PWT at 5 V?
At VCC = 5 V and CL = 50 pF, the SN74HC541PWT exhibits a typical propagation delay (tpd) of 12 ns, with a maximum of 23 ns over temperature and voltage extremes. This value is measured from A-input to Y-output transition under standard load conditions and is specified in Table 6.10 of the official SN74HC541PWT datasheet revision E (May 2022).
Is the SN74HC541PWT pin-compatible with other TSSOP-20 octal buffers?
The SN74HC541PWT shares the same TSSOP-20 footprint and pinout with SN74HCT541PW and SN74LVC541APW, but functional differences exist: HCT variants accept TTL input levels, while LVC variants operate only down to 1.65 V and lack 5 V tolerance. Pin-for-pin replacement is possible only with identical logic family and voltage requirements - always verify VIH/VIL and absolute maximum ratings before substitution.
SN74HC541PWT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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:
- 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-TSSOP
SN74HC541PWT FAQ
1.How can I place an order for SN74HC541PWT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC541PWT 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 SN74HC541PWT reliable?
The price and inventory of SN74HC541PWT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC541PWT is usually 5 days.
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SN74HC541PWT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC541PWT 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 SN74HC541PWT?
For technical support, including SN74HC541PWT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC541PWT requirements.
6.How does Aetrix verify that SN74HC541PWT is sourced from the original manufacturer or authorized distributors?
All SN74HC541PWT 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 SN74HC541PWT meets industry standards.
7.What is the process for return or replacement of SN74HC541PWT?
All SN74HC541PWT units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC541PWT, 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 SN74HC541PWT part is unused and in its original packaging.
Return procedure for SN74HC541PWT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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