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Texas Instruments SN74HCT541PWT
- Part No.:
- SN74HCT541PWT
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74HCT541PWT.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:686
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Product details
Overview
SN74HCT541PWT 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 (VCC = 5.5 V, CL = 50 pF), and supports up to 15 LSTTL loads.
For engineers reviewing the SN74HCT541PWT datasheet, SN74HCT541PWT pinout, SN74HCT541PWT application, or SN74HCT541PWT equivalent, key selection criteria include its dual 3-state enable inputs (OE1/OE2), data-flow-through pinout (inputs on one side, outputs on the other), low 80-µA max ICC quiescent current, TTL-voltage-compatible inputs, and TSSOP-20 package compatibility with high-density PCB layouts.
Technical Context
The SN74HCT541PWT implements eight independent non-inverting buffers, each with true (non-inverted) output logic. Its 3-state control uses a 2-input NOR gate: either OE1 or OE2 high forces all eight Y outputs into high-impedance state. This enables bidirectional bus control without external logic.
Designed as a performance- and pinout-optimized variant of the 'HC240 family, it features input and output terminals arranged on opposite sides of the package-reducing trace crossovers and simplifying routing in compact board designs. All inputs are TTL-voltage compatible (VIH = 2 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures robust operation across standard 5-V supply tolerances and brown-out margins. |
| Output Drive | ±6 mA at 5 V - sufficient to directly drive 15 LSTTL loads or interface with system buses without external buffering. |
| Propagation Delay | 12 ns typical (VCC = 5.5 V, CL = 50 pF) - supports >30 MHz clocked data paths in synchronous bus applications. |
| Quiescent Current | 80 µA max - enables low-power standby modes in battery-backed or energy-sensitive systems. |
| Input Compatibility | TTL-voltage levels (VIH ≥ 2 V, VIL ≤ 0.8 V) - allows direct connection to legacy 5-V TTL logic without level-shifting. |
| 3-State Enable Logic | NOR-gated OE1/OE2 - single-pin disable capability (either OE high disables all outputs), simplifying bus arbitration control. |
| Input Leakage | 1 µA max - minimizes loading on upstream drivers and preserves signal integrity in high-impedance source configurations. |
Pinout & Package
TSSOP-20 package (6.50 mm × 4.40 mm, 1.2 mm max height), lead-free (NIPDAU), moisture sensitivity level 1 (260°C peak reflow), RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Buffer Inputs (A1–A8) | True logic inputs driving corresponding Y outputs; TTL-compatible voltage thresholds ensure interoperability with legacy 5-V logic families. |
| 9, 19 | 3-State Enables (OE1, OE2) | NOR-gated active-low enables: either pin high places all Y outputs in high-Z; both low enables output drivers. |
| 10, 11, 12, 13, 14, 15, 16, 18 | Buffer Outputs (Y1–Y8) | Non-inverting, 3-state outputs capable of ±6 mA sink/source; high-Z state isolates bus segments during contention or idle periods. |
| 17 | GND | Ground reference for all internal circuitry and I/O; requires low-inductance connection to minimize switching noise coupling. |
| 20 | VCC | 5-V power supply input; must be decoupled with ≥0.1 µF ceramic capacitor placed adjacent to pin per TI layout guidance. |
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 jumps and reduces PCB trace length by >40% vs. conventional layouts. |
| High-current 3-state outputs | ±6 mA drive strength at 5 V - eliminates need for external bus transceivers when interfacing with multiple LSTTL loads. |
| Low power consumption | 80 µA max ICC - extends battery life in portable instrumentation and reduces thermal load in densely packed modules. |
| TTL-voltage compatible inputs | VIH = 2 V min, VIL = 0.8 V max - enables seamless integration with 74LS, 74ALS, and other legacy 5-V TTL families without level shifters. |
| Two independent 3-state controls | OE1 and OE2 inputs with NOR logic - supports flexible bus partitioning (e.g., OE1 for upper byte, OE2 for lower byte) or redundant enable paths. |
Applications
| Industrial PLC Backplane Interface | Automotive Body Control Module (BCM) I/O Expansion |
|---|---|
Use Scenario: Isolating microcontroller GPIOs from noisy 24-V industrial backplane signals via level-shifted 5-V logic domains. IC Role / Device Role / Timing Role: Octal buffer providing galvanically isolated signal conditioning and bus-driving capability between MCU and peripheral cards. Use Value: ±6 mA drive ensures reliable toggling of optocoupler inputs and relay drivers; 3-state enables hot-swap capability without bus contention. | Use Scenario: Expanding I/O count for door lock, window lift, and lighting control in space-constrained BCM designs. IC Role / Device Role / Timing Role: Non-inverting line driver translating MCU GPIO states to dedicated load-control lines with current gain. Use Value: Data-flow-through pinout reduces PCB area by 22% vs. SOIC-20; TSSOP-20 footprint fits within 8 mm × 6 mm module envelopes. |
| Test Equipment Digital Pattern Generator | Medical Patient Monitor Sensor Interface |
Use Scenario: Driving multiple parallel test vectors onto DUT pins while maintaining precise timing alignment across channels. IC Role / Device Role / Timing Role: Synchronized octal buffer ensuring sub-15 ns skew between all eight output transitions. Use Value: 12 ns typical tpd and <1 ns channel-to-channel skew enable deterministic stimulus generation at 33 MHz clock rates. | Use Scenario: Buffering analog-to-digital converter (ADC) control signals and sensor excitation lines in low-noise patient monitoring circuits. IC Role / Device Role / Timing Role: Low-leakage (1 µA max) buffer isolating sensitive ADC reference and clock distribution networks from digital switching noise. Use Value: 80 µA max ICC prevents thermal drift in precision analog sections; TTL-compatible inputs simplify integration with existing 5-V sensor ASICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer/line driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT240PW | Inverting outputs; dual 4-bit configuration with separate OE controls per group; identical TSSOP-20 package and electrical specs. | Suitable where signal inversion is required per group (e.g., differential bus pairs); not drop-in for non-inverting paths. | Select SN74HCT240PW only if inverting logic is needed - otherwise SN74HCT541PWT provides true-output behavior with unified 8-bit enable. |
| SN74LVC541APW | 3.3-V operation (1.65–3.6 V); higher speed (tPD = 5.2 ns typ); lower drive (±24 mA); 3.3-V I/O voltage tolerance. | Required for mixed-voltage systems with 3.3-V MCUs; incompatible with 5-V-only buses without level translation. | Choose SN74LVC541APW for 3.3-V domains; SN74HCT541PWT remains optimal for legacy 5-V TTL/CMOS interfaces. |
Compared with SN74HCT240PW and SN74LVC541APW, the SN74HCT541PWT uniquely delivers true (non-inverting) octal buffering at 5 V with minimal layout overhead-making it the preferred choice for 5-V bus isolation, I/O expansion, and legacy system upgrades where signal polarity preservation is mandatory.
Availability
SN74HCT541PWT is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and test equipment requiring stable component supply and long-term obsolescence management.
Supply support for SN74HCT541PWT 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 SN74HCT541PWT belongs to TI's HCT logic family-designed specifically for 5-V TTL-compatible interoperability, low power, and high noise immunity in industrial control and legacy system interface applications.
FAQ
What is the operating voltage range for the SN74HCT541PWT?
The SN74HCT541PWT operates from 4.5 V to 5.5 V. This range ensures compatibility with standard 5-V power rails while accommodating typical supply tolerances and transient dips. Operation outside this range may cause functional failure or permanent damage, as specified in the absolute maximum ratings (–0.5 V to 7 V). The device is not rated for 3.3-V operation.
Does the SN74HCT541PWT support true or inverted output logic?
The SN74HCT541PWT provides true (non-inverting) output logic: each Y output replicates the logic state of its corresponding A input when enabled. This distinguishes it from inverting variants like the SN74HCT240. The SN74HCT541PWT datasheet explicitly confirms "true data at the outputs" in Section 7.1, and the function table shows Y = A when OE1 = OE2 = L.
What is the maximum capacitive load the SN74HCT541PWT can drive reliably?
The SN74HCT541PWT is characterized for CL = 50 pF and CL = 150 pF in its switching specifications. At 5.5 V, typical propagation delay is 12 ns (CL = 50 pF) and 19 ns (CL = 150 pF). While not explicitly rated beyond 150 pF, TI's application guidance indicates stable operation up to 200 pF with minor timing degradation-provided layout minimizes trace inductance and VCC is properly decoupled.
Is the SN74HCT541PWT pin-compatible with other packages in the same family?
Yes-the SN74HCT541PWT shares identical pinout and functionality with all SN74HCT541 variants (e.g., SN74HCT541DBR, SN74HCT541DWR, SN74HCT541N), regardless of package (TSSOP, SSOP, SOIC, PDIP). Pin 1 (A1), pin 9 (OE1), pin 10 (Y1), pin 17 (GND), and pin 20 (VCC) retain consistent roles across all versions, enabling direct PCB footprint substitution where mechanical constraints allow.
What is the thermal resistance (RθJA) of the SN74HCT541PWT in its TSSOP-20 package?
The junction-to-ambient thermal resistance (RθJA) for the SN74HCT541PWT in the TSSOP-20 (PW) package is 131.8 °C/W, as specified in Section 5.3 of the datasheet (Revision E, May 2022). This value assumes standard JEDEC 2-layer board conditions; actual thermal performance improves with additional copper pour, thermal vias, or heatsinking.
SN74HCT541PWT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- 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:
- 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-TSSOP
SN74HCT541PWT FAQ
1.How can I place an order for SN74HCT541PWT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCT541PWT 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 SN74HCT541PWT reliable?
The price and inventory of SN74HCT541PWT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCT541PWT is usually 5 days.
3.What payment methods are accepted for SN74HCT541PWT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HCT541PWT transactions.
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4.How is shipping managed for SN74HCT541PWT?
SN74HCT541PWT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCT541PWT 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 SN74HCT541PWT?
For technical support, including SN74HCT541PWT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCT541PWT requirements.
6.How does Aetrix verify that SN74HCT541PWT is sourced from the original manufacturer or authorized distributors?
All SN74HCT541PWT 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 SN74HCT541PWT meets industry standards.
7.What is the process for return or replacement of SN74HCT541PWT?
All SN74HCT541PWT units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCT541PWT, 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 SN74HCT541PWT part is unused and in its original packaging.
Return procedure for SN74HCT541PWT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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