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NXP Semiconductors 74HC540N,652
- Part No.:
- 74HC540N,652
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
74HC540N,652.pdf
- Description:
- IC BUFFER INVERT 6V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,541
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Product details
Overview
74HC540N,652 from Nexperia is an 8-bit inverting buffer/line driver with 3-state outputs, designed for bus-oriented applications requiring bidirectional data flow control. It features dual active-low output enables (OE1, OE2), operates from 2.0 V to 6.0 V, delivers ±35 mA output drive per pin, and supports industrial temperature range (−40 °C to +125 °C) in a 20-lead DIP package.
For engineers reviewing the 74HC540N,652 datasheet, 74HC540N,652 pinout, 74HC540N,652 application, or 74HC540N,652 equivalent, key selection criteria include its CMOS-level input compatibility, 3-state bus isolation capability, propagation delay of 9–30 ns (VCC = 4.5–6.0 V), and robust ESD protection (HBM > 2000 V).
Technical Context
The 74HC540N,652 implements eight identical inverting buffer circuits with independent input-to-output logic inversion and simultaneous 3-state control via two low-active enable inputs. Its internal structure includes input clamp diodes enabling safe interfacing to voltages exceeding VCC when used with current-limiting resistors.
It complies with JEDEC JESD7A (2.0–6.0 V supply) and JESD8C (2.7–3.6 V), meets Class II Level B latch-up immunity (>100 mA), and is specified across −40 °C to +125 °C ambient temperature - confirming suitability for industrial-grade digital interface and bus buffering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.0 V to 6.0 V - supports mixed-voltage system interfacing and battery-powered operation down to 2 V. |
| Output Drive | ±35 mA per output - sufficient to directly drive TTL loads or multiple CMOS inputs without external buffers. |
| Propagation Delay | 9 ns (typ, VCC = 6.0 V) - enables reliable operation in high-speed address/data bus applications up to ~50 MHz. |
| Input Thresholds | VIH = 4.2 V, VIL = 1.8 V (VCC = 6.0 V) - ensures noise margin >1.2 V under full-supply conditions. |
| ESD Protection | HBM > 2000 V, CDM > 1000 V - reduces risk of handling damage during PCB assembly and field service. |
| Operating Temp | −40 °C to +125 °C - validated for extended industrial environments including motor control and power supply monitoring. |
| Power Dissipation | Ptot = 500 mW (SO20) - allows sustained operation at full load without thermal derating below 109 °C ambient. |
Pinout & Package
74HC540N,652 is supplied in a 20-lead plastic dual in-line package (DIP), designated SOT146-1 per Nexperia's historical ordering information (discontinued in Rev. 8 but confirmed for N-suffix parts). Pin 1 is index-marked; package body width is 7.62 mm (0.3 inch), lead pitch is 2.54 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-low 3-state enable inputs - both must be LOW to activate outputs; either HIGH forces all Yn into high-impedance state. |
| 2–9 | A0–A7 | Inverting data inputs - each drives corresponding inverted output Y0–Y7 when enabled. |
| 10 | GND | Ground reference - decoupling capacitor (100 nF) recommended adjacent to pin 10 for noise suppression. |
| 11–18 | Y0–Y7 | Inverting 3-state outputs - Yn = NOT(An) when OE1=OE2=LOW; otherwise high-Z. |
| 20 | VCC | Positive supply - must be bypassed to GND with low-ESR ceramic capacitor (100 nF) near pin 20. |
Key Features
| Feature | Design Value |
|---|---|
| Wide Supply Range | 2.0–6.0 V operation enables direct compatibility with 3.3 V and 5 V logic families without level shifters. |
| Inverting 3-State Logic | Dual OE inputs allow flexible bus arbitration - e.g., OE1 for primary control, OE2 for fail-safe disable or test mode. |
| Input Clamp Diodes | Permits safe connection of inputs to voltages > VCC (e.g., 12 V sensor signals) using series current-limiting resistors. |
| High Noise Immunity | CMOS input structure provides >40 % VCC noise margin at VCC = 5 V, reducing susceptibility to crosstalk in dense PCB layouts. |
| Latch-Up Robustness | Exceeds 100 mA per JESD78 Class II Level B - prevents destructive latch-up during transient overvoltage events. |
Applications
| Industrial Bus Buffering | Microcontroller I/O Expansion |
|---|---|
Use Scenario: Isolating and driving parallel address/data buses between microcontrollers and peripheral ICs in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Inverting 3-state buffer providing direction-controlled signal conditioning and bus contention prevention. Use Value: Enables clean bus turnaround with <30 ns enable/disable timing, eliminating glitches during read/write transitions. | Use Scenario: Expanding GPIO count on resource-constrained MCUs by connecting parallel port peripherals like LCD modules or keypad matrices. IC Role / Device Role / Timing Role: Level-shifting and fan-out buffer translating MCU logic levels to higher-current peripheral interfaces. Use Value: Delivers ±35 mA per output to directly drive LED segments or relay drivers without external transistors. |
| Legacy System Interface | Test Equipment Signal Conditioning |
Use Scenario: Interfacing modern 3.3 V FPGAs to legacy 5 V TTL backplanes in automated test equipment (ATE) racks. IC Role / Device Role / Timing Role: Bidirectional voltage-tolerant buffer supporting mixed-voltage domain bridging with precise timing control. Use Value: Input clamp diodes allow safe 5 V signal injection into 3.3 V systems using 2.2 kΩ series resistors per line. | Use Scenario: Driving calibrated reference signals to multiple DUT inputs while maintaining signal integrity and isolation during switching. IC Role / Device Role / Timing Role: Precision 3-state driver ensuring zero DC loading on reference sources when disabled. Use Value: High OFF-state impedance (>10 MΩ typical) prevents reference voltage droop during multi-channel test sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT540N,652 | TTL-compatible inputs (VIH = 2.0 V min), same pinout and 3-state behavior. | Better suited for interfacing with legacy 5 V TTL logic where HC thresholds may cause marginal switching. | Select when driving from standard TTL outputs or when VIH/VIL margins must match legacy 5 V systems. |
| SN74LS540N | Bipolar TTL technology; higher ICC (45 mA typ), slower propagation (25 ns min), 4.75–5.25 V only. | Compatible only in 5 V-only systems; lacks wide supply range and ESD robustness of HC family. | Choose only for drop-in replacement in existing LS-based designs where power and speed constraints permit. |
Compared with 74HC540N,652, the 74HCT540N,652 offers improved input compatibility with TTL sources but identical timing and drive strength, while SN74LS540N trades CMOS efficiency for legacy TTL interoperability at the cost of higher power and narrower voltage tolerance.
Availability
74HC540N,652 is available at Aetrix Electronics and suitable for industrial automation, test equipment, and embedded control applications requiring stable component supply, long-term obsolescence management, and traceable sourcing.
Supply support for 74HC540N,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
Nexperia is a global semiconductor expert delivering high-performance, reliable discrete, logic, and MOSFET solutions with focus on efficiency and sustainability.
The 74HC540N,652 belongs to Nexperia's HC logic family - engineered for low-power, high-noise-immunity digital interfacing in industrial, automotive (non-safety), and consumer applications.
FAQ
What is the maximum supply voltage rating for the 74HC540N,652?
The 74HC540N,652 has an absolute maximum supply voltage (VCC) of +7.0 V per Table 4 in the Nexperia datasheet. However, the recommended operating range is 2.0 V to 6.0 V. Operation above 6.0 V is not guaranteed and risks permanent damage or accelerated parametric drift, even if within the limiting value.
Does the 74HC540N,652 support mixed-voltage interfacing, such as 3.3 V inputs driving a 5 V-powered 74HC540N,652?
Yes - the 74HC540N,652 accepts input voltages up to VCC + 0.5 V (with current limiting), and its CMOS inputs have VIH = 4.2 V at VCC = 6.0 V. When powered at 5 V, VIH ≈ 3.15 V, making it compatible with 3.3 V logic outputs. Input clamp diodes further enable safe overvoltage tolerance when series resistors are used.
What is the function of the two output enable pins (OE1 and OE2) on the 74HC540N,652?
Both OE1 (pin 1) and OE2 (pin 19) are active-low enables. The outputs Y0–Y7 enter high-impedance state if *either* OE1 *or* OE2 is HIGH. Outputs are active (inverting) only when *both* OE1 and OE2 are LOW. This dual-enable architecture supports hierarchical bus control or redundant safety disable paths in critical systems.
Can the 74HC540N,652 drive LEDs directly, and what current limit applies per output?
Yes - the 74HC540N,652 can drive LEDs directly with up to 35 mA sink/source per output (IO = ±35 mA, Table 4). For a typical red LED (VF ≈ 1.8 V @ 20 mA), connect anode to VCC and cathode to Yn, enabling current flow when Yn = LOW. Always verify total package power (≤500 mW) and thermal rise under sustained load.
Is the 74HC540N,652 pin-compatible with the 74HCT540N,652?
Yes - the 74HC540N,652 and 74HCT540N,652 share identical pinout, package (SOT146-1 DIP), and 3-state functional behavior. The sole difference is input threshold compatibility: HC uses CMOS thresholds (~70 % VCC), while HCT uses TTL thresholds (~2.0 V VIH), making them electrically interchangeable only when source logic levels meet both families' requirements.
74HC540N,652 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HC
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-DIP
74HC540N,652 FAQ
1.How can I place an order for 74HC540N,652 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC540N,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 74HC540N,652 reliable?
The price and inventory of 74HC540N,652 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC540N,652 is usually 5 days.
3.What payment methods are accepted for 74HC540N,652?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC540N,652 transactions.
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4.How is shipping managed for 74HC540N,652?
74HC540N,652 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC540N,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 74HC540N,652?
For technical support, including 74HC540N,652 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC540N,652 requirements.
6.How does Aetrix verify that 74HC540N,652 is sourced from the original manufacturer or authorized distributors?
All 74HC540N,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 74HC540N,652 meets industry standards.
7.What is the process for return or replacement of 74HC540N,652?
All 74HC540N,652 units undergo pre-shipment inspection (PSI). If there is an issue with 74HC540N,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 74HC540N,652 part is unused and in its original packaging.
Return procedure for 74HC540N,652:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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