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onsemi 74ACT541PC
- Part No.:
- 74ACT541PC
- Manufacturer:
- onsemi
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
74ACT541PC.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,972
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Product details
Overview
74ACT541PC from onsemi is an octal non-inverting buffer/line driver with 3-state outputs, designed for memory and address bus interfacing in 5 V TTL-compatible digital systems. It features flow-through pinout (inputs on one side, outputs on the other), ±24 mA output drive capability, 7.5 ns max propagation delay at 5 V, and operates across −40 °C to +85 °C.
For engineers reviewing the 74ACT541PC datasheet, pinout, applications, or equivalent options, key selection criteria include TTL-compatible input thresholds, 3-state bus contention control, microprocessor port interface suitability, and SOIC-20W package compatibility with legacy 74-series layouts.
Technical Context
The 74ACT541PC implements eight independent non-inverting buffers, each with separate 3-state enable control via dual active-low OE inputs (OE1 and OE2). Its TTL-compatible inputs accept 0.8 V (VIL) and 2.0 V (VIH) thresholds at 5 V supply, enabling direct interfacing with standard TTL logic without level shifting.
It uses bipolar-CMOS (BiCMOS) process technology to achieve low ICC (≤40 µA), high-speed AC performance (tPLH/tPHL ≤ 7.5 ns), and robust output drive (VOH ≥ 4.4 V at IOH = −24 mA, VOL ≤ 0.44 V at IOL = 24 mA), making it suitable for driving terminated and unterminated transmission lines in backplane and motherboard applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL and CMOS systems without regulation overhead. |
| Propagation Delay | ≤7.5 ns (max, TA = −40 °C to +85 °C, CL = 50 pF) - enables reliable operation in high-speed address/data bus timing budgets. |
| Output Drive | ±24 mA - supports direct connection to multiple TTL loads or stub-loaded buses without external buffering. |
| Input Thresholds | VIL = 0.8 V, VIH = 2.0 V - guarantees interoperability with legacy 74LS, 74F, and other TTL-family devices. |
| 3-State Leakage | ±2.5 µA (max) - minimizes bus leakage current during high-impedance state, preserving signal integrity in shared-bus architectures. |
| Operating Temperature | −40 °C to +85 °C - qualified for industrial and extended commercial environments including embedded controllers and instrumentation. |
| Power Dissipation Cap. | 70 pF - defines dynamic power consumption (CPD × f × V²) for accurate thermal estimation in dense PCB layouts. |
Pinout & Package
74ACT541PC is housed in a 20-pin SOIC-20W (wide-body) package (Case 751BJ), 7.5 mm wide, 12.8 mm long, 2.36 mm height, JEDEC MS-013 compliant, Pb-free, with 1.27 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Inputs (I1–I8) | Active-high data inputs accepting TTL-compatible logic levels; routed to opposite side of package for flow-through layout. |
| 9, 10, 11, 13, 14, 15, 16, 17 | Outputs (Y1–Y8) | Non-inverting buffered outputs with 3-state control; Y1–Y4 share OE1, Y5–Y8 share OE2 for grouped bus control. |
| 12 | Ground (GND) | Reference return path for all internal circuitry and output drivers; requires low-inductance PCB connection. |
| 20 | Supply (VCC) | +5 V power rail; decoupling capacitor (0.1 µF ceramic) required within 10 mm of this pin for noise suppression. |
| 19, 18 | Output Enables (OE1, OE2) | Active-low enables controlling Y1–Y4 (OE1) and Y5–Y8 (OE2); both must be LOW for output assertion; HIGH places outputs in high-Z. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout | Inputs on left (pins 1–8), outputs on right (pins 9–10,11,13–17), enabling straight trace routing and reduced layer count in microprocessor bus interfaces. |
| TTL-compatible inputs | Guaranteed VIH = 2.0 V and VIL = 0.8 V at VCC = 4.5–5.5 V - eliminates need for input level translators when interfacing with 74LS/74F families. |
| Low ICC and IOZ | Quiescent supply current ≤40 µA and 3-state leakage ≤±2.5 µA - reduces standby power and prevents bus contention-induced voltage shifts. |
| High-output drive | 24 mA source/sink per output - drives up to 10 standard TTL loads or sustains signal integrity over 15 cm FR-4 traces at 20 MHz. |
| Pb-free packaging | RoHS-compliant SOIC-20W (Case 751BJ) with G-suffix marking - meets environmental compliance requirements for industrial and automotive-qualified designs. |
Applications
| Microprocessor Address Bus Driver | Memory Interface Buffer |
|---|---|
|
Use Scenario: Driving 16-bit address lines from an 80C88 or Z80 CPU to multiple SRAM/ROM chips on a single PCB layer. IC Role / Device Role / Timing Role: Non-inverting octal buffer providing isolation, fanout expansion, and 3-state control during DMA cycles. Use Value: Flow-through pinout allows direct left-to-right routing; 7.5 ns delay ensures setup/hold timing margins are maintained at 8 MHz bus clock. |
Use Scenario: Isolating bidirectional data bus between microcontroller and parallel EEPROM or flash memory array. IC Role / Device Role / Timing Role: Direction-controlled line driver with OE1/OE2 enabling read/write separation and bus contention avoidance. Use Value: ±24 mA drive sustains logic levels across 10 cm daisy-chained data lines; 0.44 V VOL ensures valid LOW recognition under worst-case loading. |
| Industrial PLC I/O Expansion Module | Legacy System Bus Transceiver |
|
Use Scenario: Interfacing 8-bit DIP-switch configuration inputs and LED status outputs in a DIN-rail mounted controller. IC Role / Device Role / Timing Role: Input conditioning and output buffering with independent enable groups for modular I/O partitioning. Use Value: −40 °C to +85 °C rating supports uncooled enclosures; TTL-compatible inputs tolerate contact bounce and EMI without Schmitt triggers. |
Use Scenario: Replacing obsolete 74LS244 in a retro-computing motherboard upgrade where footprint and timing must match exactly. IC Role / Device Role / Timing Role: Pin-compatible drop-in replacement delivering faster propagation, lower power, and improved noise immunity. Use Value: Identical SOIC-20W footprint and pinout; 7.5 ns max delay improves timing margin by 2.5 ns versus 10 ns LS variant at same VCC. |
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 |
|---|---|---|---|
| 74ACT244SC | Octal buffer with identical 3-state architecture but dual 4-bit groups (vs. 74ACT541PC's 8-bit group + dual OE); same SOIC-20W package. | Supports independent enable control per 4-bit nibble - better suited for nibble-oriented data paths or partial bus gating. | Select 74ACT244SC when granular 4-bit enable control is required; otherwise 74ACT541PC offers simpler full-bus control with two OE pins. |
| SN74ACT541N | Same logic function and DC/AC specs, but in PDIP-20 package (0.3″ width); not surface-mount; higher thermal resistance. | Used in prototyping, through-hole legacy systems, or low-volume repair boards where reflow compatibility is not needed. | Choose SN74ACT541N only for hand-soldered or socketed applications; 74ACT541PC provides superior thermal performance and board density in SMT production. |
Compared with 74ACT244SC and SN74ACT541N, the 74ACT541PC delivers optimal balance of full-octal control, SOIC-20W manufacturability, and industrial temperature support - making it the preferred choice for new 5 V bus interface designs requiring reliability and layout efficiency.
Availability
74ACT541PC is available at Aetrix Electronics and suitable for industrial control systems, embedded microprocessor peripherals, and legacy system upgrades requiring stable component supply and long-term obsolescence mitigation.
Supply support for 74ACT541PC 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The 74ACT541PC belongs to onsemi's advanced CMOS logic family, engineered for high-speed, low-power 5 V digital interfacing in mission-critical industrial and computing infrastructure.
FAQ
What is the maximum operating supply voltage for the 74ACT541PC?
The 74ACT541PC has an absolute maximum VCC rating of +6.5 V, but its recommended operating range is strictly 4.5 V to 5.5 V per the datasheet. Operation outside this window risks violating input/output voltage limits, increasing ICC, and compromising timing specifications. For reliable 74ACT541PC performance, maintain VCC at 5.0 V ±0.5 V in production designs.
Does the 74ACT541PC support true bidirectional data transfer?
No, the 74ACT541PC is a unidirectional non-inverting buffer with fixed input-to-output direction. It does not contain internal direction control or bus transceiver logic. Bidirectional operation requires pairing with a complementary device like the 74ACT245 or using discrete control signals - the 74ACT541PC itself functions only as a one-way driver with 3-state outputs.
How does the 74ACT541PC differ from the 74AC541 in terms of input compatibility?
The 74ACT541PC features TTL-compatible inputs (VIH = 2.0 V, VIL = 0.8 V), allowing direct connection to 74LS and 74F logic families. In contrast, the 74AC541 uses CMOS-input thresholds (VIH ≈ 3.15 V at 5 V), requiring level translation when interfacing with TTL sources. This makes the 74ACT541PC the correct choice for mixed-logic-system integration without added components.
Can the 74ACT541PC be used with a 3.3 V microcontroller I/O port?
No - the 74ACT541PC requires a 4.5–5.5 V VCC supply and its inputs are not 3.3 V tolerant. Driving its inputs from a 3.3 V MCU violates the minimum VIH specification (2.0 V is insufficient for guaranteed HIGH recognition at VCC = 5 V). Use a level-shifting buffer or select a 3.3 V–compatible alternative such as the 74LVC541A if interfacing with 3.3 V logic.
What is the purpose of the dual OE inputs (OE1 and OE2) on the 74ACT541PC?
The 74ACT541PC uses OE1 to control outputs Y1–Y4 and OE2 to control Y5–Y8, enabling independent 3-state gating of two 4-bit sub-buses. This allows partial bus isolation - for example, holding upper address bits active while tri-stating lower data bits during a memory write cycle - improving system-level timing flexibility and reducing bus contention in complex 74ACT541PC-based interfaces.
74ACT541PC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ACT
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
74ACT541PC FAQ
1.How can I place an order for 74ACT541PC through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACT541PC 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 74ACT541PC reliable?
The price and inventory of 74ACT541PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT541PC is usually 5 days.
3.What payment methods are accepted for 74ACT541PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACT541PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACT541PC?
74ACT541PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACT541PC 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 74ACT541PC?
For technical support, including 74ACT541PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT541PC requirements.
6.How does Aetrix verify that 74ACT541PC is sourced from the original manufacturer or authorized distributors?
All 74ACT541PC 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 74ACT541PC meets industry standards.
7.What is the process for return or replacement of 74ACT541PC?
All 74ACT541PC units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT541PC, 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 74ACT541PC part is unused and in its original packaging.
Return procedure for 74ACT541PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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