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Nexperia USA Inc. 74HCT540D,652
- Part No.:
- 74HCT540D,652
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74HCT540D,652.pdf
- Description:
- IC BUFFER INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,822
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Product details
Overview
74HCT540D,652 from Nexperia is an octal inverting 3-state buffer/line driver with dual active-low output enables (OE1, OE2), TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V), ±6 mA output drive, and SO20 (SOT163-1) package. It interfaces microcontroller address/data buses to high-capacitance loads in industrial control backplanes.
For engineers reviewing the 74HCT540D,652 datasheet, 74HCT540D,652 pinout, 74HCT540D,652 application, or 74HCT540D,652 equivalent, key selection criteria include TTL-level input compatibility, 3-state bus isolation timing (ten/tdis ≤ 53 ns at VCC = 4.5 V), output current capability, thermal derating above 109 °C, and SO20 mechanical footprint compliance.
Technical Context
This device implements eight identical inverting buffer circuits with independent 3-state control via two active-low enables. Each output transitions between logic inversion of its input and high-impedance OFF-state based on OE1 and OE2 logic levels - both must be LOW for enabled operation.
Input clamp diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors. Static characteristics are specified across -40 °C to +125 °C, with VOH ≥ 3.7 V and VOL ≤ 0.4 V at IO = ±6 mA and VCC = 4.5 V, ensuring robust noise margins in noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Octal inverting 3-state buffer with dual active-low output enables (OE1, OE2) |
| Supply Voltage | 4.5 V to 5.5 V - matches standard 5 V TTL systems without level translation |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - ensures reliable recognition of TTL logic levels |
| Output Drive | ±6.0 mA at VCC = 4.5 V - sufficient to drive 50 pF loads with <36 ns propagation delay |
| Propagation Delay | tpd = 24 ns typ (An→Yn), 30 ns max at VCC = 4.5 V, CL = 50 pF - supports >10 MHz bus operation |
| Enable/Disable Time | ten = tdis = 35 ns typ, 53 ns max at VCC = 4.5 V - enables fast bus turnaround in multiplexed systems |
| Operating Temperature | -40 °C to +125 °C - qualified for extended industrial and under-hood applications |
Pinout & Package
74HCT540D,652 uses the SO20 plastic small outline package (SOT163-1), 20-pin, 7.5 mm body width, with 1.27 mm lead pitch and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-low output enable inputs - both LOW required for output enable; HIGH forces all Yn to high-impedance |
| 2–9 | A0–A7 | Inverting data inputs - each drives corresponding Yn output with logic inversion |
| 10 | GND | Ground reference (0 V) - return path for all internal currents and output loads |
| 11–18 | Y7–Y0 | Inverting 3-state outputs - Y0 corresponds to A0, Y7 to A7; outputs mirror inverted inputs when enabled |
| 20 | VCC | Positive supply rail - powers internal CMOS circuitry; decoupling capacitor required near pin |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | VIH/VIL thresholds aligned to 5 V TTL (2.0 V/0.8 V), eliminating need for level shifters in legacy 5 V systems |
| Dual independent enables | OE1 and OE2 provide flexible bus partitioning - e.g., A0–A3 and A4–A7 can be isolated separately |
| Input clamp diodes | Enable safe overvoltage tolerance (VI > VCC) when used with series current-limiting resistors |
| High noise immunity | CMOS design with >40 % noise margin at VCC = 5 V ensures stable operation in electrically noisy industrial cabinets |
| Thermal derating support | Ptot = 500 mW at Tj ≤ 109 °C, derating 12.3 mW/K above - enables reliable operation in sealed enclosures |
Applications
| Industrial PLC Backplane Interface | Microcontroller Address Bus Expansion |
|---|---|
Use Scenario: Isolating and driving 8-bit address lines from a microcontroller to multiple peripheral modules on a DIN-rail mounted PLC backplane with 100+ pF trace capacitance. IC Role / Device Role / Timing Role: Inverting 3-state buffer providing bidirectional bus separation and signal integrity restoration during address decoding cycles. Use Value: Enables clean 10 MHz address strobing with <36 ns propagation delay and 5.4 V VOH at 6 mA drive, reducing setup/hold violations. |
Use Scenario: Expanding limited GPIO count on an ARM Cortex-M4 MCU by buffering and isolating 8-bit parallel data to external SRAM or FPGA configuration memory. IC Role / Device Role / Timing Role: Level-shifting and fanout buffer that translates MCU GPIO logic to robust 5 V TTL-compatible signals while enabling/disabling per memory access cycle. Use Value: Dual OE pins allow interleaved memory bank selection; ±6 mA drive sustains signal integrity across 15 cm PCB traces. |
| Legacy Instrumentation Bus Driver | Test Equipment Signal Conditioning |
Use Scenario: Driving legacy GPIB or IEEE-488-compatible control lines from modern low-voltage logic in automated test equipment racks. IC Role / Device Role / Timing Role: Voltage-level translator and current booster converting 3.3 V MCU outputs to full 5 V TTL swing with precise 3-state control for bus arbitration. Use Value: Input clamp diodes permit direct connection to 5.5 V bus lines using 1 kΩ series resistors, avoiding external protection components. |
Use Scenario: Conditioning digital trigger and sync signals between mixed-voltage subsystems (e.g., 3.3 V FPGA logic and 5 V analog front-end) in benchtop oscilloscopes. IC Role / Device Role / Timing Role: Glitch-free 3-state isolator preventing ground loop coupling and crosstalk during signal routing reconfiguration. Use Value: 53 ns max disable time ensures sub-20 ns bus release, critical for deterministic trigger latency in multi-channel acquisition. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT240N | Same function, dual enables, but DIP-20 package (not SO20); higher ICC (160 μA max vs. 80 μA) | Through-hole assembly only; lacks SO20 surface-mount compatibility and thermal performance | Select only for prototyping or legacy through-hole designs where SO20 footprint is unavailable |
| 74LVC240APW | Lower voltage (1.65–3.6 V), non-inverting, 32 mA drive, TSSOP20 package | Designed for 3.3 V systems; incompatible TTL input thresholds and logic polarity | Use only in new 3.3 V designs requiring higher drive; not a drop-in replacement for 5 V TTL interface |
Compared with SN74HCT240N and 74LVC240APW, the 74HCT540D,652 uniquely combines SO20 surface-mount compatibility, guaranteed TTL input thresholds, inverting logic, and industrial temperature range - making it the sole fit for space-constrained 5 V industrial backplane interfaces requiring pin-accurate replacement.
Availability
74HCT540D,652 is available at Aetrix Electronics and suitable for industrial PLC backplanes, microcontroller address bus expansion, legacy instrumentation bus drivers, and test equipment signal conditioning requiring stable component supply across extended temperature ranges.
Supply support for 74HCT540D,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 focused on essential efficiency technologies, delivering high-performance logic, discrete, and MOSFET solutions for automotive, industrial, and consumer markets.
The 74HCT540D,652 belongs to Nexperia's industry-standard 74HCT logic family, designed specifically for robust 5 V TTL-compatible interfacing in harsh industrial environments with extended temperature operation and high ESD resilience.
FAQ
What is the maximum clock frequency supported by the 74HCT540D,652?
The 74HCT540D,652 does not operate on a clock; it is an asynchronous buffer. Its usable data rate depends on propagation delay (30 ns max An→Yn at VCC = 4.5 V) and load capacitance. With 50 pF load, it reliably supports bus toggle rates up to ~10 MHz, assuming adequate setup/hold timing margins in the system design.
Can OE1 and OE2 be tied together for single-enable operation?
Yes - OE1 and OE2 may be connected to a common control signal. The functional table confirms that outputs go high-impedance if either OE is HIGH; tying them simplifies control logic but eliminates independent bank isolation capability. No additional pull-up/down resistors are needed when driven actively.
Is the 74HCT540D,652 suitable for automotive applications?
No - the 74HCT540D,652 is not AEC-Q100 qualified. While rated for -40 °C to +125 °C, it lacks automotive-specific stress testing, failure analysis, and traceability requirements. Nexperia explicitly states non-automotive qualification in its legal disclaimers; use only in industrial or commercial systems.
How does the input clamping diode affect interface design?
The integrated input clamp diodes allow safe connection to voltages up to VCC + 0.5 V (or down to -0.5 V) when series current-limiting resistors are used. For example, a 1 kΩ resistor limits IIK to <20 mA when interfacing to a 12 V line, protecting the IC without external diodes - a key advantage in mixed-voltage backplane designs.
74HCT540D,652 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- 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:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
74HCT540D,652 FAQ
1.How can I place an order for 74HCT540D,652 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT540D,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 74HCT540D,652 reliable?
The price and inventory of 74HCT540D,652 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT540D,652 is usually 5 days.
3.What payment methods are accepted for 74HCT540D,652?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT540D,652 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT540D,652?
74HCT540D,652 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT540D,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 74HCT540D,652?
For technical support, including 74HCT540D,652 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT540D,652 requirements.
6.How does Aetrix verify that 74HCT540D,652 is sourced from the original manufacturer or authorized distributors?
All 74HCT540D,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 74HCT540D,652 meets industry standards.
7.What is the process for return or replacement of 74HCT540D,652?
All 74HCT540D,652 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT540D,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 74HCT540D,652 part is unused and in its original packaging.
Return procedure for 74HCT540D,652:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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