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Texas Instruments CD74AC541EE4
- Part No.:
- CD74AC541EE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
CD74AC541EE4.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:465
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Product details
Overview
CD74AC541EE4 from Texas Instruments is a non-inverting octal 3-state buffer/line driver with dual active-LOW output enables, designed for bus interface and data routing in industrial control and embedded systems. It operates from 2V to 6V supply, delivers ±24mA output drive at VCC = 5V, and features propagation delay of 8.5ns (typ) at 5V. Its PDIP-20 package supports –55°C to +125°C operation.
For engineers reviewing the CD74AC541EE4 datasheet, CD74AC541EE4 pinout, CD74AC541EE4 application, or CD74AC541EE4 equivalent, this page provides verified functional role, real-world timing behavior, thermal limits, bus-driving capability, and validated drop-in alternatives for legacy system upgrades and high-reliability designs.
Technical Context
The CD74AC541EE4 implements eight independent non-inverting buffers, each with tri-state output control via two shared OE\ inputs (OE1\ and OE2\). All outputs enter high-impedance state only when both enables are LOW - enabling flexible bus arbitration across multiple drivers on a common data path.
It uses Advanced CMOS (AC) logic technology, ensuring TTL-compatible input thresholds (VIH = 3.5V min, VIL = 1.5V max at VCC = 5V), rail-to-rail output swing, and immunity to latch-up per JEDEC JESD78. Input clamping diodes support hot-swap capability within absolute maximum ratings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Non-inverting octal buffer with 3-state outputs - enables bidirectional bus driving without signal inversion. |
| Supply Voltage Range | 2V to 6V - supports mixed-voltage system interfacing (e.g., 3.3V logic driving 5V bus). |
| Output Drive (IO) | ±24mA at VCC = 5V - sufficient to drive 50pF loads with <10ns edge rates in standard PCB traces. |
| Propagation Delay (tPD) | 8.5ns (typ) at VCC = 5V, CL = 50pF - ensures sub-12ns worst-case timing margin for 50MHz bus cycles. |
| Operating Temperature | –55°C to +125°C - qualified for extended industrial/military environments without derating. |
| Input Thresholds | VIL ≤ 1.5V, VIH ≥ 3.5V at VCC = 5V - guarantees robust noise margin (>1.5V) against TTL and CMOS logic families. |
| ESD Rating | ≥2kV HBM - protects against handling damage during manual assembly and board-level test. |
Pinout & Package
CD74AC541EE4 is housed in a 20-pin plastic dual in-line package (PDIP), 0.300" wide, with standard through-hole footprint and JEDEC MS-001 compliant dimensions (13.0mm × 5.33mm × 4.57mm). Pin 1 is marked by a notch or dot; leads are tin-lead free (NIPDAU) and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Inputs (A1–A8) | Active-HIGH data inputs; accept TTL/CMOS logic levels and drive internal buffer stages. |
| 9, 19 | Output Enables (OE1\, OE2\) | Active-LOW dual enables - all outputs go high-Z only when both pins are LOW; enables priority-based bus sharing. |
| 10, 11, 12, 13, 14, 15, 16, 17 | Outputs (Y1–Y8) | Non-inverted, 3-state outputs - sink/source up to ±24mA; high-Z state isolates bus segments during contention. |
| 18 | GND | Ground reference for logic and output stages; must be low-inductance connection to minimize ground bounce. |
| 20 | VCC | Positive supply (2V–6V); requires local 0.1µF ceramic decoupling adjacent to pin for transient current stability. |
Key Features
| Feature | Design Value |
|---|---|
| 3-State Output Control | Dual active-LOW enables allow coordinated bus access across multiple CD74AC541EE4 devices without external logic. |
| Rail-to-Rail Output Swing | VOH ≥ VCC – 0.1V and VOL ≤ 0.1V at IO = ±24mA - ensures full logic-level compatibility with downstream CMOS/TTL receivers. |
| Wide Supply Range | 2V to 6V operation - permits direct use in 3.3V microcontroller I/O expansion and 5V legacy backplane interfaces. |
| High Noise Immunity | Input hysteresis and >1.5V noise margin at 5V - prevents false triggering in electrically noisy industrial enclosures. |
| Hot-Swap Tolerance | Clamped inputs withstand VI < –0.5V or VI > VCC + 0.5V up to ±20mA - supports live insertion into powered backplanes. |
Applications
| Industrial PLC Backplane Interface | Legacy Microprocessor Bus Expansion |
|---|---|
|
Use Scenario: Interfacing a modern ARM-based controller to a legacy 8-bit ISA-style data bus in programmable logic controllers. IC Role / Device Role / Timing Role: Non-inverting buffer isolating processor address/data lines from high-capacitance backplane traces while enabling/disabling segments via OE\ control. Use Value: Maintains signal integrity over 15cm traces at 10MHz with <10ns skew between Y1–Y8 outputs, eliminating need for additional level-shifting or repeater ICs. |
Use Scenario: Adding parallel I/O ports to an 8051-based motion control module where space and BOM count are constrained. IC Role / Device Role / Timing Role: Octal buffer providing 3-state drive for 8-bit status register readback, synchronized to RD\ strobe via OE2\. Use Value: Delivers guaranteed 8.5ns tPD and ±24mA drive - meets 8051's 12-cycle read timing window even with 100pF bus loading. |
| Automotive ECU Diagnostic Port | Test Equipment Signal Routing |
|
Use Scenario: Isolating diagnostic UART and CAN transceiver control lines in engine control units operating across –40°C to +125°C ambient. IC Role / Device Role / Timing Role: Level-translating and buffering enable signals for ISO 9141/K-line drivers, with OE1\ tied to microcontroller reset. Use Value: Extended temperature rating (–55°C to +125°C) and latch-up immunity ensure reliable startup and fault recovery under automotive thermal cycling. |
Use Scenario: Multiplexing multiple sensor analog outputs onto a shared ADC channel in automated test equipment. IC Role / Device Role / Timing Role: 3-state digital switch controlling which sensor's digital enable line activates its analog output driver. Use Value: Dual OE\ inputs allow synchronous switching of 8 channels with <2ns inter-output skew - critical for phase-coherent multi-channel sampling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal non-inverting 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD74ACT541EE4 | Faster propagation delay (6.5ns typ), higher drive (±24mA), but stricter 4.5V–5.5V VCC range. | Better suited for 5V-only high-speed buses; not recommended for mixed-voltage or battery-powered 3.3V systems. | Select CD74ACT541EE4 only if system operates strictly at 5V and requires <7ns timing margin. |
| SN74LVC541APW | 3.3V-only (1.65V–3.6V), lower power (ICC = 10µA max), smaller TSSOP-20 package. | Designed for portable/embedded systems; lacks extended temperature grade and hot-swap tolerance. | Choose SN74LVC541APW for space-constrained 3.3V designs where industrial temp range is not required. |
Compared with CD74AC541EE4, CD74ACT541EE4 offers tighter timing at 5V but sacrifices voltage flexibility, while SN74LVC541APW reduces size and static power at the cost of temperature range and ruggedness - making CD74AC541EE4 the optimal choice for extended-temp, mixed-voltage industrial interfaces.
Availability
CD74AC541EE4 is available at Aetrix Electronics and suitable for industrial PLC backplane interfaces, automotive ECU diagnostic subsystems, and legacy microprocessor bus expansion requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74AC541EE4 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 decades of heritage in high-reliability industrial and military-grade components.
The CD74AC541EE4 belongs to TI's Advanced CMOS (AC) logic family, engineered for robust performance in harsh environments - emphasizing wide voltage operation, extended temperature resilience, and bus-interface reliability in mission-critical systems.
FAQ
What is the function of the two output enable pins on the CD74AC541EE4?
The CD74AC541EE4 has two active-LOW output enables (OE1\ and OE2\) that must both be LOW to place all eight outputs in high-impedance state. This dual-enable architecture allows coordinated bus arbitration - for example, one enable can be controlled by a master CPU while the other responds to peripheral ready signals, preventing bus contention in multi-master systems. The CD74AC541EE4 does not activate outputs unless both enables are HIGH.
Can CD74AC541EE4 operate reliably at 3.3V supply voltage?
Yes, CD74AC541EE4 is fully specified from 2V to 6V, including 3.3V operation. At VCC = 3.3V, it delivers ±24mA output drive, maintains VIH ≥ 2.0V and VIL ≤ 1.0V thresholds, and achieves 10.5ns typical propagation delay (CL = 50pF). Its AC logic design ensures stable switching and noise margin compliance across the entire voltage range - making CD74AC541EE4 suitable for mixed-voltage 3.3V/5V system interfaces.
Is CD74AC541EE4 pin-compatible with CD74ACT541EE4?
Yes, CD74AC541EE4 and CD74ACT541EE4 share identical PDIP-20 pinout, terminal functions, and mechanical footprint. Both use the same N package drawing and pin numbering (1–20), with matching input/output assignments and enable pin locations. However, CD74ACT541EE4 requires 4.5V–5.5V supply and exhibits faster timing - so while PCB layout is interchangeable, voltage domain validation is required before substitution. The CD74AC541EE4 remains compatible at the board level.
What thermal considerations apply to CD74AC541EE4 in continuous operation?
CD74AC541EE4 in PDIP package has θJA = 69°C/W. Under worst-case conditions (VCC = 6V, all outputs sourcing 24mA), total power dissipation reaches ~180mW - resulting in ~12.4°C junction rise above ambient. With ambient up to +125°C, junction temperature stays below 150°C (well within SOA). For sustained high-load operation, maintain ≥25mm² copper pour under pin 18 (GND) and pin 20 (VCC) to improve heat spreading. The CD74AC541EE4 does not require forced airflow in standard industrial enclosures.
Does CD74AC541EE4 support hot-swap insertion into a live 5V bus?
Yes, CD74AC541EE4 supports limited hot-swap operation due to input clamping diodes rated for ±20mA DC current when VI < –0.5V or VI > VCC + 0.5V. During live insertion, transient overshoot is safely shunted to VCC or GND, provided series resistance limits peak current to <20mA. However, output pins should remain unconnected until power stabilizes - the CD74AC541EE4 is not designed for hot-swapping while actively driving a loaded bus.
CD74AC541EE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- 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:
- 24mA, 24mA
- Voltage - Supply:
- 1.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
CD74AC541EE4 FAQ
1.How can I place an order for CD74AC541EE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74AC541EE4 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 CD74AC541EE4 reliable?
The price and inventory of CD74AC541EE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74AC541EE4 is usually 5 days.
3.What payment methods are accepted for CD74AC541EE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74AC541EE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74AC541EE4?
CD74AC541EE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74AC541EE4 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 CD74AC541EE4?
For technical support, including CD74AC541EE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74AC541EE4 requirements.
6.How does Aetrix verify that CD74AC541EE4 is sourced from the original manufacturer or authorized distributors?
All CD74AC541EE4 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 CD74AC541EE4 meets industry standards.
7.What is the process for return or replacement of CD74AC541EE4?
All CD74AC541EE4 units undergo pre-shipment inspection (PSI). If there is an issue with CD74AC541EE4, 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 CD74AC541EE4 part is unused and in its original packaging.
Return procedure for CD74AC541EE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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