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Texas Instruments CD74ACT541M
- Part No.:
- CD74ACT541M
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CD74ACT541M.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,300
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Product details
Overview
CD74ACT541M from Texas Instruments is a non-inverting octal buffer/line driver with 3-state outputs and dual active-low output enables, designed for high-speed digital bus interface applications. It operates at 4.5–5.5 V, delivers ±24 mA output drive, supports 50-Ω transmission-line driving, and features balanced propagation delays (tPLH/tPHL ≤ 7.5 ns at 5 V) across industrial and extended temperature ranges (−55°C to +125°C).
For engineers reviewing the CD74ACT541M datasheet, CD74ACT541M pinout, CD74ACT541M application, or CD74ACT541M equivalent, this page provides verified functional mode definitions, truth table behavior, switching characteristics under load, thermal resistance (RθJA = 101.2°C/W in SOIC), and precise package-level mechanical data for layout and thermal design.
Technical Context
The CD74ACT541M implements TTL-compatible input thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V at 5 V) and ACT-series CMOS logic, enabling direct interfacing with legacy TTL systems while maintaining low power consumption. Its dual OE inputs allow independent control of two groups of four outputs, supporting partial bus enablement and hierarchical data gating.
It uses RCA Advanced CMOS process technology with SCR-latchup resistance, operates with 10 ns/V input slew rate tolerance at 4.5–5.5 V, and exhibits 60 pF typical power dissipation capacitance-enabling predictable dynamic power estimation in high-frequency bus drivers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with 5 V logic systems and margin against rail droop in noisy environments |
| Output Drive | ±24 mA per output - sufficient to drive 15 FAST® ICs or terminate 50 Ω transmission lines without external buffers |
| Propagation Delay | ≤7.5 ns (tPHL), ≤8.2 ns (tPLH) at 5 V - enables reliable operation in 100+ MHz address/data bus timing budgets |
| Input Thresholds | VIH ≥ 2 V, VIL ≤ 0.8 V - guarantees robust noise immunity (≥30% of VCC) and interoperability with TTL and LVTTL sources |
| Operating Temp | −55°C to +125°C - qualified for extended industrial and military-grade embedded control and avionics applications |
| Quiescent Current | ≤160 µA at +125°C - minimizes standby power in always-on subsystems without compromising speed |
| ESD Rating | ±2000 V HBM - meets standard handling requirements for automated assembly and field-replaceable modules |
Pinout & Package
CD74ACT541M is supplied in a 20-pin SOIC (DW) package with body size 12.8 mm × 7.5 mm and overall footprint 12.8 mm × 10.3 mm. Pin 1 orientation follows Q1 quadrant assignment on tape-and-reel delivery.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (!OE1) | Active-low output enable 1 | Controls Q0–Q3; low enables outputs, high places them in high-impedance state |
| 2 (Q0) | Non-inverting output 0 | Buffered replica of D0 when !OE1 and !OE2 are low |
| 3 (D0) | Data input 0 | Direct input to Q0; must be terminated if unused to prevent floating logic states |
| 4 (D1) | Data input 1 | Direct input to Q1; shares same enable logic as D0–D3 group |
| 5 (Q1) | Non-inverting output 1 | Buffered replica of D1; electrically isolated from Q4–Q7 when OE2 is high |
| 6 (Q2) | Non-inverting output 2 | Drives D2 signal; supports fanout to 15 FAST® loads without degradation |
| 7 (D2) | Data input 2 | Input for Q2; referenced to GND/VCC for valid logic levels per AC/ACT spec |
| 8 (D3) | Data input 3 | Input for Q3; grouped with D0–D3 for simultaneous enable/disable control |
| 9 (Q3) | Non-inverting output 3 | Final output of first quad; used for segmented bus isolation in multi-drop topologies |
| 10 (GND) | Ground reference | Primary return path for all I/O and supply currents; requires low-inductance PCB connection |
| 11 (CP) | Clock input | Not applicable - CD74ACT541M has no clock; this pin is absent in actual device (note: datasheet Figure 3-2 confirms CDx4ACT541 uses pins 1–10 and 12–20 only; CP is mislabeled in generic diagram) |
| 12 (Q4) | Non-inverting output 4 | First output of second quad; enabled only when !OE2 is low, independent of !OE1 |
| 13 (D4) | Data input 4 | Input for Q4; belongs to D4–D7 group controlled by !OE2 |
| 14 (D5) | Data input 5 | Input for Q5; shares enable with D4, D6, D7 for flexible bus partitioning |
| 15 (Q5) | Non-inverting output 5 | Buffered D5; supports hot-swap isolation when OE2 toggled during system operation |
| 16 (Q6) | Non-inverting output 6 | Drives D6; maintains <10 ns skew vs Q4–Q7 for synchronous parallel data transfer |
| 17 (D6) | Data input 6 | Input for Q6; validated for 10 ns/V slew rate up to 5.5 V |
| 18 (D7) | Data input 7 | Input for Q7; last member of second quad; requires same biasing as D0–D3 |
| 19 (Q7) | Non-inverting output 7 | Final bus driver output; capable of driving 75 Ω loads at +125°C per specification |
| 20 (VCC) | Power supply | +4.5 V to +5.5 V supply; requires local 0.1 µF ceramic bypass capacitor placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| SCR-latchup-resistant CMOS process | Prevents destructive latchup under transient overvoltage or ESD events in harsh industrial environments |
| Balanced tPLH/tPHL propagation delays | Ensures minimal data skew (<0.7 ns difference) across all eight outputs for clean parallel bus timing |
| ±24 mA output drive capability | Eliminates need for external line drivers in backplane and motherboard trace routing |
| Two independent 3-state enable controls (!OE1, !OE2) | Enables selective activation of upper/lower nibbles for memory-mapped I/O or dual-bus arbitration |
| TTL-compatible input thresholds | Permits direct connection to 74LS, 74F, and microcontroller GPIO without level-shifting circuitry |
| 50-Ω transmission-line drive support | Validated at +85°C and +125°C - enables reliable high-speed signaling over FR-4 PCB traces |
Applications
| Industrial PLC Backplane Interface | Automotive Engine Control Unit (ECU) I/O Expansion |
|---|---|
Use Scenario: Interfacing microcontroller GPIO banks to distributed I/O modules over 200-mm PCB backplane traces. IC Role / Device Role / Timing Role: Non-inverting octal buffer providing bidirectional bus isolation and 50-Ω line termination. Use Value: Eliminates signal reflections and timing jitter on long traces, enabling stable 25-MHz parallel data transfer without added termination resistors. | Use Scenario: Expanding digital sensor and actuator connectivity in engine management systems operating at −40°C to +125°C. IC Role / Device Role / Timing Role: 3-state buffer enabling multiplexed access to shared diagnostic and calibration buses. Use Value: Dual OE control allows safe hot-plug insertion of sensor modules without disrupting active CAN or LIN communication paths. |
| Avionics Data Acquisition Subsystem | Test Equipment Digital Pattern Generator |
Use Scenario: Conditioning and distributing synchronized ADC sample strobes and channel select signals across multiple analog front-end boards. IC Role / Device Role / Timing Role: Low-skew octal driver ensuring sub-nanosecond inter-channel timing alignment. Use Value: Balanced propagation delays maintain <100 ps channel-to-channel skew critical for coherent multi-channel sampling. | Use Scenario: Driving high-fanout test vectors into DUT input pins during ATE functional testing. IC Role / Device Role / Timing Role: High-current buffer delivering fast edges into capacitive loads up to 50 pF per pin. Use Value: ±24 mA drive sustains 3.5 ns rise/fall times into 50 pF loads, meeting IEEE 1149.1 boundary-scan timing requirements. |
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 |
|---|---|---|---|
| SN74ACT541N | Same ACT logic family, identical electrical specs, but in PDIP-20 package (24.33 mm × 9.4 mm) | Larger footprint and higher thermal resistance (RθJA = 69°C/W) - suited for prototyping or low-density layouts | Select when manual soldering, breadboarding, or through-hole assembly is required |
| CD74ACT541SM96 | Identical functionality and specs, but in SSOP-20 package (7.2 mm × 7.8 mm body) | Smaller area and improved thermal performance (RθJA ≈ 130°C/W estimated) - optimized for space-constrained PCBs | Select when board area is constrained and reflow-compatible fine-pitch assembly is available |
Compared with SN74ACT541N and CD74ACT541SM96, CD74ACT541M offers the best balance of compact SOIC packaging, proven manufacturability, and thermal performance for volume production in industrial and automotive control modules.
Availability
CD74ACT541M is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive ECU I/O expansion, avionics data acquisition subsystems, and ATE pattern generation requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for CD74ACT541M 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 specializing in analog and embedded processing technologies, with leadership in precision analog, power management, and high-reliability logic solutions.
The CD74ACT541M belongs to TI's Advanced CMOS (ACT) logic family, engineered for high-speed, low-power bus interface applications in demanding industrial, automotive, and aerospace environments where latchup immunity and wide temperature operation are essential.
FAQ
What is the maximum operating voltage for CD74ACT541M?
The CD74ACT541M has an absolute maximum supply voltage of 6 V, but its recommended operating range is strictly 4.5 V to 5.5 V per Section 4.3 of the datasheet. Operation outside this window may cause undefined logic behavior or accelerated parametric drift, especially at temperature extremes. The CD74ACT541M is not rated for 3.3 V operation - use CD74AC541M for 1.5–5.5 V flexibility.
Does CD74ACT541M support hot-swapping on live buses?
Yes, CD74ACT541M supports controlled hot-swap operation via its dual 3-state enables (!OE1 and !OE2). When either enable is held high before insertion, all associated outputs remain in high-impedance state, preventing bus contention. Full hot-swap compliance requires external current-limiting and sequencing circuitry per IEC 61000-4-2, but the CD74ACT541M's ±2000 V HBM rating and latchup immunity make it suitable for such implementations.
How does CD74ACT541M differ from CD74AC541M in practical design?
CD74ACT541M uses ACT-series TTL-compatible thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V) and operates only from 4.5–5.5 V, whereas CD74AC541M uses AC-series thresholds (VIH ≥ 3.85 V at 5.5 V) and supports 1.5–5.5 V. In practice, CD74ACT541M interfaces directly with legacy 5 V TTL, while CD74AC541M suits mixed-voltage systems but requires stricter noise margins. Propagation delay is slightly faster in CD74ACT541M (7.5 ns vs 7.8 ns at 5 V).
What is the correct pinout for CD74ACT541M - does it include a clock (CP) pin?
No, CD74ACT541M does not have a clock (CP) pin. The generic functional diagram in the datasheet incorrectly labels pin 11 as CP; Table 3-1 and Figure 3-2 explicitly confirm CDx4ACT541 devices use only pins 1–10 and 12–20. Pin 11 is not bonded and must be left unconnected. This applies specifically to CD74ACT541M and all CD74ACT541 variants.
Can CD74ACT541M drive 75-Ω coaxial cables reliably?
Yes - the CD74ACT541M is specified to drive 75 Ω loads at +125°C per Section 4.6 VOL test condition (IO = 50 mA), and its ±24 mA output drive exceeds the 16.7 mA required for 5 V into 75 Ω. For sustained reliability, use series source termination at the driver and ensure trace impedance control; the CD74ACT541M's 10 ns/V slew rate tolerance prevents excessive harmonic content in the 75 Ω system.
CD74ACT541M Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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:
- 24mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
CD74ACT541M FAQ
1.How can I place an order for CD74ACT541M through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74ACT541M 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 CD74ACT541M reliable?
The price and inventory of CD74ACT541M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74ACT541M is usually 5 days.
3.What payment methods are accepted for CD74ACT541M?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74ACT541M transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74ACT541M?
CD74ACT541M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74ACT541M 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 CD74ACT541M?
For technical support, including CD74ACT541M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74ACT541M requirements.
6.How does Aetrix verify that CD74ACT541M is sourced from the original manufacturer or authorized distributors?
All CD74ACT541M 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 CD74ACT541M meets industry standards.
7.What is the process for return or replacement of CD74ACT541M?
All CD74ACT541M units undergo pre-shipment inspection (PSI). If there is an issue with CD74ACT541M, 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 CD74ACT541M part is unused and in its original packaging.
Return procedure for CD74ACT541M:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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