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NXP Semiconductors 74HCT541N,652
- Part No.:
- 74HCT541N,652
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
74HCT541N,652.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,722
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Product details
Overview
74HCT541N,652 from NXP Semiconductors is an octal non-inverting 3-state buffer/line driver in a 20-pin DIP package, operating from 4.5 V to 5.5 V with TTL-compatible inputs and ±6 mA output drive at VCC = 4.5 V. It features dual active-low output enables (OE1, OE2), input clamp diodes for overvoltage protection, and is rated for −40 °C to +125 °C industrial temperature range.
For engineers reviewing the 74HCT541N,652 datasheet, 74HCT541N,652 pinout, 74HCT541N,652 application, or 74HCT541N,652 equivalent, this device serves as a robust bus interface component in legacy digital systems requiring level translation between TTL logic and 5 V CMOS buses, with precise timing control via independent enable signals and low quiescent current.
Technical Context
The 74HCT541N,652 implements eight identical non-inverting buffer stages, each with high-impedance tri-state outputs controlled by two independent active-low enable inputs. Its TTL-level input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V) ensure compatibility with standard LS-TTL logic families without level-shifting circuitry.
Propagation delay is 15 ns typical (28 ns max at 25 °C, 42 ns max at +125 °C), with enable/disable times of 21 ns typical (35 ns max at 25 °C, 53 ns max at +125 °C) - enabling reliable operation in synchronous bus architectures up to ~20 MHz. Input capacitance is 3.5 pF, and power dissipation capacitance is 39 pF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures interoperability with standard 5 V TTL and mixed-voltage systems |
| Input Logic Level | TTL-compatible - VIH ≥ 2.0 V, VIL ≤ 0.8 V - eliminates need for external level shifters when interfacing with 74LS/74F families |
| Output Drive | ±6.0 mA at VOH/VOL - sufficient to drive 10 LSTTL loads or terminate short PCB traces without buffering |
| Propagation Delay | 15 ns typ @ VCC = 4.5 V, CL = 50 pF - supports reliable data transfer in 20 MHz bus cycles |
| Operating Temperature | −40 °C to +125 °C - qualified for extended industrial and under-hood applications |
| ESD Protection | HBM > 2000 V, MM > 200 V - provides robust handling margin during board assembly and field service |
| Power Dissipation Cap. | 39 pF - enables accurate dynamic power estimation using PD = CPD × VCC² × fi × N |
Pinout & Package
74HCT541N,652 uses the SOT146-1 plastic dual in-line package (DIP20), 300 mil width, 2.54 mm lead pitch, with 0.36 mm lead thickness and 26.7 mm body length. Pin 1 is marked by a notch or dot; leads are tin-plated copper alloy.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE1) | Active-low output enable 1 | Controls Y0–Y3 outputs; LOW enables, HIGH places outputs in high-Z state |
| 2–9 (A0–A7) | Data inputs | Non-inverting inputs for corresponding Y0–Y7 outputs; accept TTL voltage levels |
| 10 (GND) | Ground reference | 0 V return path for all internal logic and output drivers; must be low-impedance |
| 11–18 (Y0–Y7) | Tri-state buffered outputs | Non-inverting outputs; high-Z when either OE1 or OE2 is HIGH |
| 19 (OE2) | Active-low output enable 2 | Controls Y4–Y7 outputs; independent of OE1 for flexible bus partitioning |
| 20 (VCC) | Positive supply | 4.5–5.5 V DC supply; decoupling capacitor (100 nF) required near pin |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent output enables | Allows selective activation of upper/lower nibbles (Y0–Y3 vs. Y4–Y7) for partial bus control without full bus arbitration |
| TTL-compatible input thresholds | Eliminates need for external pull-ups or level translators when interfacing with legacy 74LS/74F logic families |
| Input clamp diodes | Enables safe interface to voltages exceeding VCC (e.g., hot-swap or mixed-supply scenarios) when used with current-limiting resistors |
| High-impedance OFF-state | Output leakage ≤ ±5 µA at VCC = 5.5 V ensures minimal bus contention during disable, critical for shared-bus reliability |
| Wide temperature range | −40 °C to +125 °C operation validated per JEDEC JESD22-A104 - suitable for industrial control cabinets and automotive under-hood ECUs |
Applications
| Industrial PLC Backplane Interface | Legacy Computer Bus Expansion |
|---|---|
Use Scenario: Interfacing microcontroller I/O ports to a 24 V tolerant industrial backplane with multiple slot-mounted modules. IC Role / Device Role / Timing Role: Bidirectional bus buffer isolating MCU GPIOs from noisy backplane signals while providing TTL-level compatibility and 3-state control for slot arbitration. Use Value: Dual OE pins allow per-slot enable/disable without global bus reset; ±6 mA drive sustains signal integrity across 15 cm backplane traces. | Use Scenario: Adding ISA-compatible peripheral cards (e.g., serial/parallel adapters) to vintage x86 systems with 5 V TTL signaling. IC Role / Device Role / Timing Role: Non-inverting line driver translating CPU address/data bus signals to card edge connectors, with OE-controlled tristate for bus sharing. Use Value: 15 ns propagation delay meets ISA timing budgets; TTL input thresholds match original 80286/80386 bus drivers without redesign. |
| Automotive Body Control Module | Test Equipment Digital I/O Card |
Use Scenario: Isolating microcontroller GPIOs from relay driver ICs and sensor inputs in a BCM operating in under-dash environments. IC Role / Device Role / Timing Role: Octal buffer providing noise-immune signal conditioning and bus isolation between MCU and high-current peripherals. Use Value: −40 °C to +125 °C rating ensures reliability in thermal cycling conditions; input clamp diodes protect against load-dump transients when used with series resistors. | Use Scenario: Building modular digital I/O cards for automated test equipment requiring programmable signal routing and bus contention management. IC Role / Device Role / Timing Role: Configurable 3-state buffer enabling dynamic reconfiguration of signal paths on a shared backplane. Use Value: Independent OE1/OE2 permits fine-grained control of signal groups; 3.5 pF input capacitance minimizes loading on high-speed pattern generators. |
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 |
|---|---|---|---|
| SN74HCT541N | Identical pinout, function, and electrical specs; TI-manufactured with same JEDEC 7A compliance and −40 °C to +125 °C rating | No functional difference; validated in identical legacy bus and industrial control designs | Select when sourcing from TI's authorized distribution channel or requiring TI-specific traceability |
| 74HCT244N,652 | Same octal non-inverting 3-state architecture but with single OE input (not dual); otherwise identical VCC, drive, and timing specs | Lacks independent upper/lower nibble control - requires external logic for partial bus enable if OE1/OE2 functionality is needed | Choose only if dual-OE capability is unnecessary and cost or inventory consolidation is prioritized |
Compared with SN74HCT541N and 74HCT244N,652, the 74HCT541N,652 uniquely delivers independent control of two output groups via OE1 and OE2 - enabling selective bus segment activation without additional logic, reducing BOM count and layout complexity in multi-module systems.
Availability
74HCT541N,652 is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy computer bus expansion, automotive body control modules, and test equipment digital I/O cards requiring stable component supply across extended temperature ranges.
Supply support for 74HCT541N,652 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
NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The 74HCT541N,652 belongs to NXP's legacy HC/HCT logic family, designed specifically to provide TTL-compatible, high-noise-immunity digital interface components for industrial control, instrumentation, and retro-computing systems requiring long-term supply stability.
FAQ
What is the maximum clock frequency supported by the 74HCT541N,652?
The 74HCT541N,652 is not a clocked device and has no internal clock - it is a combinatorial buffer. Its usable data rate depends on propagation delay (15 ns typical) and system timing margins. For clean signal transmission, it reliably supports bus toggle rates up to ~20 MHz in well-terminated 50 pF load conditions, as verified in NXP's dynamic characterization at VCC = 4.5 V.
Can the 74HCT541N,652 drive LED indicators directly?
Yes, the 74HCT541N,652 can drive standard 2 mA LEDs directly when configured as a sink (LOW output) with a series resistor. With VO(L) ≤ 0.33 V at IO = 6 mA and VCC = 4.5 V, a 330 Ω resistor yields ~12 mA forward current - sufficient for bright indicator operation. Avoid sourcing current (HIGH output) due to higher VOL and reduced margin.
Is the 74HCT541N,652 pin-compatible with the 74HC541N?
Yes, the 74HCT541N,652 is pin-compatible and functionally identical to the 74HC541N in the same DIP20 package, differing only in input threshold levels: 74HCT541N,652 accepts TTL inputs (VIH ≥ 2.0 V), while 74HC541N requires CMOS inputs (VIH ≥ 3.15 V at VCC = 4.5 V). Swapping them requires verifying source logic family compatibility.
Does the 74HCT541N,652 require external pull-up resistors on its outputs?
No, external pull-ups are not required for normal 3-state bus operation. The 74HCT541N,652 outputs are actively driven HIGH or LOW when enabled, and enter true high-impedance (not weak pull-up) when disabled. Pull-ups may be added only if a defined logic level is needed during high-Z periods - but this defeats the purpose of tristate control and risks contention.
What is the meaning of the ",652" suffix in 74HCT541N,652?
The ",652" suffix is NXP's internal packaging and ordering code indicating the device is supplied in a tube (bulk packaging) format for the DIP20 package (SOT146-1), consistent with NXP's standard ordering nomenclature. It does not denote a functional variant - electrically and mechanically, 74HCT541N,652 is identical to 74HCT541N.
74HCT541N,652 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HCT
- 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:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-DIP
74HCT541N,652 FAQ
1.How can I place an order for 74HCT541N,652 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT541N,652 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 74HCT541N,652 reliable?
The price and inventory of 74HCT541N,652 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT541N,652 is usually 5 days.
3.What payment methods are accepted for 74HCT541N,652?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT541N,652 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT541N,652?
74HCT541N,652 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT541N,652 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 74HCT541N,652?
For technical support, including 74HCT541N,652 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT541N,652 requirements.
6.How does Aetrix verify that 74HCT541N,652 is sourced from the original manufacturer or authorized distributors?
All 74HCT541N,652 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 74HCT541N,652 meets industry standards.
7.What is the process for return or replacement of 74HCT541N,652?
All 74HCT541N,652 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT541N,652, 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 74HCT541N,652 part is unused and in its original packaging.
Return procedure for 74HCT541N,652:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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