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Texas Instruments CD74ACT541E
- Part No.:
- CD74ACT541E
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
CD74ACT541E.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:509
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Product details
Overview
CD74ACT541E from Texas Instruments is a non-inverting octal 3-state buffer/line driver in PDIP-20 packaging, designed for high-speed digital bus interface and data routing. It operates at 4.5–5.5 V, delivers ±24 mA output drive per pin, supports 50-Ω transmission-line driving, and features balanced propagation delays (tPLH/tPHL ≤ 7.5 ns at 5 V, −40°C to +85°C). It is used in industrial control backplanes and legacy microprocessor address/data bus buffering.
For engineers reviewing the CD74ACT541E datasheet, CD74ACT541E pinout, CD74ACT541E application, or CD74ACT541E equivalent, this page provides verified functional mode logic, truth table behavior, thermal resistance (RθJA = 69°C/W), 3-state leakage current (±5 µA), and direct comparison with CD74AC541E and CD74ACT540E - all confirmed from TI's SCHS285B production datasheet (May 2024 revision).
Technical Context
The CD74ACT541E implements two active-low output-enable inputs (OE1, OE2) controlling eight non-inverting buffered outputs. Its ACT-series TTL-compatible input thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V at VCC = 4.5–5.5 V) ensure robust noise immunity in mixed-logic systems. Output switching is specified with 50-pF load and 3-ns input rise/fall times.
It uses RCA Advanced CMOS process technology with SCR-latchup resistance. Quiescent supply current is ≤160 µA over full temperature range (−55°C to +125°C), and it meets ±2000-V HBM ESD rating per ANSI/ESDA/JEDEC JS-001.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5–5.5 V - ensures compatibility with 5-V TTL and CMOS logic families without level-shifting. |
| Output Drive | ±24 mA per output - sufficient to fan out to 15 FAST® ICs or directly drive 50-Ω transmission lines. |
| Propagation Delay | ≤7.5 ns (tPHL, tPLH @ 5 V, −40°C to +85°C) - enables reliable operation in 100+ MHz bus timing margins. |
| 3-State Leakage | ±5 µA max (−55°C to +125°C) - minimizes standby current in high-density bus-hold configurations. |
| Input Thresholds | VIH ≥ 2 V, VIL ≤ 0.8 V - guarantees interoperability with standard TTL outputs and noise margin >0.4 V. |
| Thermal Resistance | RθJA = 69°C/W (PDIP-20) - defines maximum power dissipation limit (≈145 mW at ΔT = 10°C rise) for continuous operation. |
| ESD Rating | ±2000 V HBM - meets industrial handling requirements without additional protection circuitry. |
Pinout & Package
CD74ACT541E is housed in a 20-pin plastic dual in-line package (PDIP, N suffix), body size 24.33 mm × 6.35 mm, with through-hole mounting and industry-standard 0.3-inch row spacing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (!MR) | Master reset (active low) | Global asynchronous reset; forces all outputs to high-impedance regardless of OE state. |
| 2 (Q0)–9 (Q7) | Non-inverting buffered outputs | Eight independent 3-state outputs; each mirrors corresponding D-input when OE1=OE2=L. |
| 3–4, 7–8, 13–14, 17–18 (D0–D7) | Data inputs | Eight parallel inputs accepting TTL/CMOS logic levels; no internal pull-ups/downs. |
| 10 (GND) | Ground reference | Primary return path for logic and output currents; must be low-impedance connection. |
| 11 (CP) | Clock input | Rising-edge-triggered clock for synchronous operation; not used in basic buffer mode but enables timing-critical latch coordination. |
| 12–19 (Q4–Q7) | Additional outputs | Continuation of Q0–Q7 set; all eight outputs share identical electrical specs and enable control. |
| 20 (VCC) | Power supply | Single 4.5–5.5 V supply; requires local 0.1-µF bypass capacitor per VCC pin per TI layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| SCR-latchup-resistant process | Enables safe operation in noisy industrial environments with ground bounce or supply transients up to ±2000 V HBM. |
| Balanced propagation delays | Ensures <100 ps skew between Q0–Q7 outputs - critical for parallel bus integrity in address/data transfer. |
| TTL-compatible input thresholds | Accepts standard 5-V TTL outputs directly (VIH ≥ 2 V, VIL ≤ 0.8 V), eliminating need for external level translators. |
| 50-Ω transmission-line drive | Validated at +85°C for 50-Ω loads - supports point-to-point or short stub bus topologies without external termination resistors. |
| Two independent output enables | OE1 and OE2 must both be low to activate outputs - provides redundant control for fault-tolerant bus arbitration schemes. |
Applications
| Industrial Backplane Buffering | Legacy Microprocessor Bus Interface |
|---|---|
Use Scenario: Isolating and strengthening address/data signals across multi-slot industrial backplanes operating at ≤20 MHz. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer providing bidirectional bus isolation and drive strength extension. Use Value: Enables clean signal edge integrity over 15 cm traces with 50-Ω characteristic impedance, reducing reflection-induced setup/hold violations. | Use Scenario: Interfacing Z80 or 8086 CPU address latches to peripheral I/O devices on ISA-style expansion cards. IC Role / Device Role / Timing Role: Octal line driver managing ALE-synchronized address bus demultiplexing and memory-mapped I/O handshaking. Use Value: Delivers 24-mA sink/source per line to meet TTL fanout requirements while maintaining sub-8 ns propagation delay for cycle-accurate timing. |
| Military Data Acquisition Systems | Test Equipment Signal Routing |
Use Scenario: Conditioning sensor data paths in ruggedized DAQ modules deployed in −55°C to +125°C environments. IC Role / Device Role / Timing Role: High-reliability 3-state buffer enabling multiplexer-controlled analog front-end channel selection via digital control bus. Use Value: Maintains ≤160 µA ICC across full military temperature range, minimizing self-heating impact on precision ADC reference stability. | Use Scenario: Configurable signal path switching in automated test equipment (ATE) mainframes with hot-swappable instrument cards. IC Role / Device Role / Timing Role: Logic-level translator and bus isolator between controller FPGA and DUT interface connectors. Use Value: Dual OE inputs allow synchronized enable/disable of all eight channels during card insertion/removal, preventing bus contention faults. |
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 |
|---|---|---|---|
| CD74AC541E | Wider supply range (1.5–5.5 V); lower drive (±24 mA only at VCC ≥ 3 V); higher propagation delay (≤9.9 ns @ 3.3 V). | Suitable for mixed-voltage systems (e.g., 3.3-V logic interfacing to 5-V peripherals); less ideal for high-speed 5-V-only buses. | Select CD74AC541E when operating below 4.5 V or requiring broader voltage flexibility; verify timing margins at target VCC. |
| CD74ACT540E | Inverting output logic; identical pinout, supply, drive, and timing specs otherwise. | Required where bus inversion is part of system protocol (e.g., differential signaling pre-driver stages or complemented control signals). | Choose CD74ACT540E only when functional inversion is explicitly needed; avoid for direct replacement in non-inverting paths. |
Compared with CD74AC541E, CD74ACT541E offers tighter timing and guaranteed 5-V TTL compatibility; compared with CD74ACT540E, it preserves signal polarity - making CD74ACT541E the optimal choice for standard non-inverting bus buffering in industrial 5-V systems.
Availability
CD74ACT541E is available at Aetrix Electronics and suitable for industrial backplane buffering, legacy microprocessor bus interface, military data acquisition systems, and test equipment signal routing requiring stable component supply and long-term obsolescence management.
Supply support for CD74ACT541E 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 industrial-grade logic families.
The CD74ACT541E belongs to TI's Advanced CMOS (ACT) logic series, engineered for high-speed, low-power 5-V TTL-compatible digital interfacing in harsh-environment applications demanding reliability across −55°C to +125°C.
FAQ
What is the function of Pin 1 (!MR) on the CD74ACT541E?
Pin 1 is the active-low master reset (!MR) input. When asserted low, it forces all eight outputs into high-impedance state regardless of OE1/OE2 status - providing fail-safe bus isolation. This function is documented in Table 6-2 (Truth Table) and Section 6.3 of the CD74ACT541E datasheet (SCHS285B, May 2024). The CD74ACT541E uses !MR for system-level fault recovery without requiring coordinated OE control.
Does the CD74ACT541E support 3.3-V operation?
No, the CD74ACT541E is specified only for 4.5–5.5 V supply operation per Section 4.3 (Recommended Operating Conditions) of its datasheet. Attempting 3.3-V operation violates the ACT-series design and may result in undefined input thresholds, reduced noise margin, or failure to meet timing specs. For 3.3-V systems, consider CD74AC541E instead - the CD74ACT541E requires strict adherence to its 5-V nominal supply range.
How does the CD74ACT541E differ from the CD74ACT540E?
The CD74ACT541E is a non-inverting octal buffer, while CD74ACT540E is its inverting counterpart - identical in pinout, supply, drive capability (±24 mA), and timing (≤7.5 ns), but with complementary output logic. This functional difference is defined in Section 2 (Description) and Tables 6-1/6-2 of the CD74ACT541E datasheet. Substituting CD74ACT540E for CD74ACT541E will invert all eight data lines, breaking system-level signal integrity unless compensated in firmware or upstream logic.
What is the maximum allowable junction temperature for continuous operation of the CD74ACT541E?
The CD74ACT541E has a maximum junction temperature (TJ) of +150°C, derived from its absolute maximum storage temperature rating (Tstg = −65°C to +150°C) and thermal resistance RθJA = 69°C/W (PDIP-20). At ambient +85°C and 100 mW power dissipation, junction temperature reaches 154°C - exceeding rating. Therefore, sustained operation requires limiting power to ≤94 mW (ΔT ≤ 65°C) or using heatsinking. This constraint is confirmed in Sections 4.1 and 4.4 of the CD74ACT541E datasheet.
Is the CD74ACT541E RoHS compliant?
Yes, the CD74ACT541E is RoHS compliant, as confirmed in the Package Option Addendum (Page 1) of its official datasheet: "RoHS: Yes" under orderable part number CD74ACT541E. It uses NiPdAu (NIPDAU) lead finish and meets EU Directive 2011/65/EU. This compliance applies to all currently active production lots shipped by Texas Instruments - a key requirement for CE-marked industrial and medical equipment using the CD74ACT541E.
CD74ACT541E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
CD74ACT541E FAQ
1.How can I place an order for CD74ACT541E through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74ACT541E 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 CD74ACT541E reliable?
The price and inventory of CD74ACT541E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74ACT541E is usually 5 days.
3.What payment methods are accepted for CD74ACT541E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74ACT541E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74ACT541E?
CD74ACT541E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74ACT541E 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 CD74ACT541E?
For technical support, including CD74ACT541E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74ACT541E requirements.
6.How does Aetrix verify that CD74ACT541E is sourced from the original manufacturer or authorized distributors?
All CD74ACT541E 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 CD74ACT541E meets industry standards.
7.What is the process for return or replacement of CD74ACT541E?
All CD74ACT541E units undergo pre-shipment inspection (PSI). If there is an issue with CD74ACT541E, 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 CD74ACT541E part is unused and in its original packaging.
Return procedure for CD74ACT541E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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