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Texas Instruments CD74HC541PW
- Part No.:
- CD74HC541PW
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
CD74HC541PW.pdf
- Description:
- IC BUFFER NON-INVERT 6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:577
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Product details
Overview
CD74HC541PW from Texas Instruments is a non-inverting octal buffer and line driver with three-state outputs, designed for bus interface and data routing in industrial control, instrumentation, and embedded systems. It operates from 2 V to 6 V, delivers 15 LSTTL load drive capability, exhibits 9 ns typical propagation delay at 5 V/15 pF, and supports –55°C to +125°C temperature range.
For engineers reviewing the CD74HC541PW datasheet, CD74HC541PW pinout, CD74HC541PW application, or CD74HC541PW equivalent, key selection criteria include its TSSOP-20 package footprint, dual output-enable control (OE1/OE2), high noise immunity (30% of VCC), and compatibility with both CMOS and TTL logic levels across extended temperature.
Technical Context
The CD74HC541PW implements eight independent non-inverting buffer channels, each with three-state output control governed by two active-low enable inputs (OE1 and OE2). Both enables must be LOW for data pass-through; either HIGH forces all outputs into high-impedance state - enabling bidirectional bus sharing without external direction control.
Its HC logic family ensures rail-to-rail input thresholds (VIH = 3.15 V min, VIL = 1.35 V max at VCC = 4.5 V), low quiescent current (≤160 μA over full temperature), and balanced rise/fall times (10–15 ns typical at 5 V/50 pF), making it suitable for mixed-voltage system interfacing where signal integrity and power efficiency are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | High-speed CMOS (HC), compatible with 2–6 V supply - enables direct interface with 3.3 V and 5 V systems without level shifters. |
| Propagation Delay | 9 ns typical at VCC = 5 V, CL = 15 pF - supports >50 MHz bus operation in low-capacitance environments. |
| Output Drive | 15 LSTTL loads - sufficient to drive multiple legacy TTL inputs on shared backplanes or PCB traces up to 15 cm. |
| Operating Temp | –55°C to +125°C - qualified for aerospace, automotive under-hood, and industrial motor control applications. |
| Input Noise Immunity | NIL/NIL = 30% of VCC at 5 V - rejects common-mode noise spikes up to ±1.5 V without false triggering. |
| Three-State Leakage | ±10 μA max at –55°C to +125°C - ensures minimal bus contention current when outputs are disabled. |
| Power Dissipation Cap | 48 pF (CPD) - used to calculate dynamic power: PD = VCC² × fi × (CPD + CL); critical for thermal budgeting in dense layouts. |
Pinout & Package
TSSOP-20 package (6.5 mm × 4.4 mm, 1.2 mm max height), lead finish 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 | Data Inputs (A0–A7) | Non-inverting inputs accepting CMOS/TTL-compatible logic levels; must be terminated to VCC or GND if unused to prevent floating states. |
| 9, 10, 11, 12, 13, 14, 15, 16 | Data Outputs (Y0–Y7) | Three-state buffered outputs; high-impedance when OE1 or OE2 is HIGH - enables time-multiplexed bus arbitration. |
| 17, 19 | Output Enables (OE1, OE2) | Active-low enables; both must be LOW for Y0–Y7 to reflect A0–A7 - provides redundant enable control for fault-tolerant designs. |
| 18 | GND | Ground reference for all I/O and internal circuitry; requires low-inductance connection to minimize ground bounce during switching. |
| 20 | VCC | Positive supply (2–6 V); requires local 0.1 μF ceramic bypass capacitor placed within 3 mm of pin to suppress high-frequency supply noise. |
Key Features
| Feature | Design Value |
|---|---|
| Non-inverting octal buffering | Preserves signal polarity across all eight channels - eliminates need for external inversion logic in address/data latching paths. |
| Dual active-low output enables | Enables fail-safe bus isolation: single-point failure in one enable path still permits controlled shutdown via the other. |
| 15-LSTTL load drive capability | Reduces need for additional bus drivers in legacy system upgrades - supports direct replacement of SN74LS244 in many industrial PLC modules. |
| Wide 2–6 V supply range | Allows operation from single Li-ion cell (3.3 V) or standard 5 V rails - simplifies power architecture in multi-rail embedded controllers. |
| –55°C to +125°C operation | Validated for use in unheated outdoor enclosures and engine-control units without derating - avoids thermal throttling in harsh environments. |
Applications
| Industrial Bus Interface | Embedded System Address Latching |
|---|---|
Use Scenario: Isolating microcontroller GPIOs from noisy 24 V industrial fieldbus segments while maintaining signal integrity over 30 cm PCB traces. IC Role / Device Role / Timing Role: Non-inverting buffer with three-state control acts as bi-directional bus isolator, synchronized to microcontroller clock edges for deterministic timing. Use Value: Prevents ground loop coupling and reduces EMI-induced bit errors by limiting fanout to 15 LSTTL loads and providing 30% noise margin. | Use Scenario: Driving 8-bit address lines from an FPGA to multiple memory-mapped peripherals in a compact medical imaging subsystem. IC Role / Device Role / Timing Role: Octal buffer provides level translation between 3.3 V FPGA I/O and 5 V peripheral address decoders, with OE1/OE2 enabling time-sliced access. Use Value: Eliminates need for discrete level shifters and reduces BOM count by consolidating eight channels in a 6.5 mm × 4.4 mm TSSOP package. |
| Automotive Sensor Signal Conditioning | Test Equipment Digital I/O Expansion |
Use Scenario: Buffering analog-to-digital converter (ADC) control signals in an engine control unit exposed to under-hood temperatures up to 125°C. IC Role / Device Role / Timing Role: Three-state driver routes ADC start/conversion signals while isolating sensitive analog sections during digital switching events. Use Value: Guaranteed operation at 125°C and low ICC (≤160 μA) extends module lifetime and reduces thermal load in sealed ECU housings. | Use Scenario: Expanding digital I/O count on automated test equipment (ATE) mainframe by adding 8 programmable output lines with precise enable timing. IC Role / Device Role / Timing Role: Logic-level translator and driver delivering sub-10 ns propagation delay and matched tPLH/tPHL for synchronized stimulus generation. Use Value: Enables <100 ns timing resolution in pattern generators without adding jitter from cascaded logic stages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal non-inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC244PWR | Same HC logic, identical 8-channel non-inverting architecture, but uses single OE (not dual OE1/OE2); TSSOP-20, same 2–6 V range. | Lacks redundant enable control - less suitable for safety-critical bus arbitration requiring dual-fault tolerance. | Select SN74HC244PWR only when simplified enable logic suffices and board layout allows single-OE routing. |
| CD74HCT541PWR | HCT variant: TTL-compatible inputs (VIH = 2 V min, VIL = 0.8 V max), fixed 4.5–5.5 V operation; otherwise identical pinout and function. | Required when interfacing directly with legacy 5 V TTL outputs without level-shifting; not suitable for 3.3 V-only systems. | Choose CD74HCT541PWR exclusively for pure 5 V TTL bus environments where input threshold compatibility is mandatory. |
Compared with SN74HC244PWR, CD74HC541PW offers dual-OE fault containment; compared with CD74HCT541PWR, it supports wider voltage operation and higher noise immunity - making CD74HC541PW optimal for mixed-voltage, high-reliability industrial designs.
Availability
CD74HC541PW is available at Aetrix Electronics and suitable for industrial automation, automotive control units, and test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74HC541PW 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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and logic ICs for industrial, automotive, and communications markets.
The CD74HC541PW belongs to TI's legacy HC logic family, engineered for robustness in harsh environments and designed to replace obsolete TTL devices while reducing power consumption and improving noise immunity in legacy system upgrades.
FAQ
What is the maximum operating voltage for the CD74HC541PW?
The CD74HC541PW supports a supply voltage range of 2 V to 6 V, with absolute maximum rating of 7 V. Operation above 6 V violates recommended conditions and risks parametric degradation or latch-up. At 6 V, VOH remains ≥5.9 V and VOL ≤0.1 V under CMOS loads, ensuring reliable logic high/low margins in high-voltage industrial interfaces.
Does the CD74HC541PW require external pull-up resistors on its outputs?
No, the CD74HC541PW does not require external pull-up resistors on its outputs. Its three-state outputs present high impedance (IOZ ≤ ±10 μA) when disabled, and actively drive to defined logic levels when enabled. Pull-ups are unnecessary unless interfacing with open-drain systems - which the CD74HC541PW does not support natively.
Can CD74HC541PW be used in place of CD74HCT541PW?
CD74HC541PW can substitute for CD74HCT541PW only if the system operates within 2–6 V and input signals meet HC thresholds (VIH ≥ 3.15 V at 4.5 V). It cannot replace CD74HCT541PW in strict 5 V TTL environments where inputs swing only 0.8–2.0 V, as CD74HC541PW's VIH is too high for reliable recognition of TTL logic highs.
What is the thermal resistance (RθJA) of the CD74HC541PW package?
The CD74HC541PW in TSSOP-20 package has a junction-to-ambient thermal resistance (RθJA) of 131.8°C/W, per TI's SCHS189E datasheet revision October 2022. This value assumes standard JEDEC 2-layer board conditions; actual thermal performance improves with copper pour, thermal vias, and airflow - critical for sustained operation near 125°C ambient.
How are the OE1 and OE2 pins intended to be used in system design?
The OE1 and OE2 pins on CD74HC541PW are both active-low enables that must be driven LOW simultaneously to activate outputs Y0–Y7. Either pin held HIGH disables all outputs. This dual-enable architecture supports fault-tolerant designs - e.g., OE1 tied to system reset and OE2 to software-controlled GPIO - ensuring outputs remain high-Z during initialization or error recovery.
CD74HC541PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- 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:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
CD74HC541PW FAQ
1.How can I place an order for CD74HC541PW through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HC541PW 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 CD74HC541PW reliable?
The price and inventory of CD74HC541PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HC541PW is usually 5 days.
3.What payment methods are accepted for CD74HC541PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HC541PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HC541PW?
CD74HC541PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HC541PW 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 CD74HC541PW?
For technical support, including CD74HC541PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HC541PW requirements.
6.How does Aetrix verify that CD74HC541PW is sourced from the original manufacturer or authorized distributors?
All CD74HC541PW 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 CD74HC541PW meets industry standards.
7.What is the process for return or replacement of CD74HC541PW?
All CD74HC541PW units undergo pre-shipment inspection (PSI). If there is an issue with CD74HC541PW, 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 CD74HC541PW part is unused and in its original packaging.
Return procedure for CD74HC541PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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