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Nexperia USA Inc. 74HCT540D,653
- Part No.:
- 74HCT540D,653
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74HCT540D,653.pdf
- Description:
- IC BUFFER INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,322
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Product details
Overview
74HCT540D,653 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 capability, and SO20 (SOT163-1) package rated for -40 °C to +125 °C operation. It serves as a bidirectional bus interface or address/data line driver in industrial microcontroller peripheral expansion systems.
For engineers reviewing the 74HCT540D,653 datasheet, 74HCT540D,653 pinout, 74HCT540D,653 application, or 74HCT540D,653 equivalent, key selection criteria include TTL-level input compatibility, 3-state control timing (ten/tdis ≤ 53 ns at VCC = 4.5 V), output drive strength under 5 V supply, thermal derating behavior above 109 °C, and SO20 mechanical footprint alignment with legacy PCB layouts.
Technical Context
This device implements eight identical inverting buffer circuits, each with independent input-to-output logic inversion and shared 3-state control via two active-low enable inputs. Its dual OE architecture allows partitioned bus control-e.g., enabling Y0–Y3 while disabling Y4–Y7-without external gating logic.
Input clamp diodes permit safe interfacing to voltages exceeding VCC when current-limiting resistors are used; static characteristics guarantee VIH ≥ 2.0 V and VIL ≤ 0.8 V across full temperature range, ensuring robust noise margin against TTL-family sources. Propagation delay (An→Yn) is 24 ns typical at VCC = 4.5 V, CL = 50 pF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Octal inverting buffer with 3-state outputs; each output is inverted relative to its input (Yn = NOT An). |
| Supply Voltage Range | 4.5 V to 5.5 V - matches standard 5 V TTL systems; not operational below 4.5 V. |
| Input Thresholds | VIH(min) = 2.0 V, VIL(max) = 0.8 V - ensures reliable recognition of TTL logic levels at VCC = 5 V. |
| Output Drive | ±6.0 mA at VOH/VOL - sufficient to drive 10 LSTTL loads or terminate 50 Ω transmission lines with series resistance. |
| Propagation Delay | 24 ns typical (An→Yn), 30 ns max at VCC = 4.5 V, CL = 50 pF - supports 20 MHz bus toggle rates with timing margin. |
| Enable Timing | ten/tdis = 35 ns typical (OE→Y), 53 ns max - enables fast bus arbitration in multiplexed memory or I/O subsystems. |
| Operating Temperature | -40 °C to +125 °C - qualified for extended industrial and under-hood automotive auxiliary applications. |
Pinout & Package
74HCT540D,653 uses the SO20 plastic small outline package (SOT163-1), 20-pin, 7.5 mm body width, 1.27 mm lead pitch, with gull-wing leads and pin 1 index marker.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-low output enable inputs; both must be LOW for outputs to drive; either HIGH forces all Yn into high-impedance state. |
| 2–9 | A0–A7 | Eight buffered data inputs; each drives corresponding inverted output Y0–Y7 when OEs are active. |
| 10 | GND | Ground reference for all internal circuitry and output load return path. |
| 11–18 | Y7–Y0 | Inverted 3-state outputs; Y7 (pin 11) corresponds to A7 (pin 9), Y0 (pin 18) to A0 (pin 2). |
| 20 | VCC | Positive supply rail (4.5–5.5 V); powers all logic and output stages; decoupling capacitor required near pin. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | VIH ≥ 2.0 V and VIL ≤ 0.8 V at VCC = 5 V - eliminates level-shifting when interfacing with legacy 74LS/74F logic. |
| Dual 3-state control | Independent OE1/OE2 pins allow split-bus management - e.g., isolate upper/lower byte lanes without external logic. |
| Clamp diode protection | Integrated input clamp diodes enable safe overvoltage tolerance up to ±20 mA - simplifies interface to higher-voltage sensors or legacy buses. |
| High noise immunity | CMOS input structure with >40 % VCC noise margin at 5 V - rejects EMI in noisy industrial environments. |
| Extended temperature range | Specified from -40 °C to +125 °C - supports deployment in motor control enclosures and power supply monitoring modules. |
Applications
| Industrial PLC I/O Expansion | Microcontroller Address Bus Buffering |
|---|---|
Use Scenario: Isolating MCU GPIO banks from high-capacitance backplane wiring in modular programmable logic controllers. IC Role / Device Role / Timing Role: Inverting 3-state buffer providing direction-controlled data latching and bus contention prevention during read/write cycles. Use Value: Dual OE pins enable synchronized enable/disable of grouped I/O channels, reducing software overhead and eliminating bus glitches during state transitions. |
Use Scenario: Driving 8-bit address lines from an 8051-family microcontroller to external EPROM or SRAM chips. IC Role / Device Role / Timing Role: Level-translating and fanout-multiplying address signal with precise propagation delay matching for setup/hold timing compliance. Use Value: 24 ns typical tpd ensures address valid window meets 70 ns SRAM access requirements at 20 MHz clock, while TTL inputs eliminate need for external pull-ups. |
| Legacy System Bus Interface | Test Equipment Signal Conditioning |
Use Scenario: Interfacing modern FPGA-based test controllers to vintage ISA or VMEbus peripherals requiring inverted strobe and data signals. IC Role / Device Role / Timing Role: Logic-level inverter and bus driver with 3-state isolation to prevent back-driving during bus arbitration. Use Value: ±6 mA drive strength sustains signal integrity across 15 cm ribbon cables; SO20 footprint matches legacy board layouts without redesign. |
Use Scenario: Conditioning digital stimulus signals in automated test equipment before routing to DUT inputs with variable load capacitance. IC Role / Device Role / Timing Role: Output impedance control and slew-rate limiting via CMOS output stage, with disable capability during calibration phases. Use Value: 5 ns typical transition time (tt) and 15 pF input capacitance minimize jitter injection; high-impedance OFF-state prevents loading of sensitive reference nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT240D,653 | Non-inverting/inverting dual 4-bit configuration (4x non-inv + 4x inv); same SO20 package and electrical specs. | Required when mixed polarity buffering is needed on same bus segment - e.g., address vs. control lines. | Select if system requires both inverting and non-inverting paths within one package to reduce component count. |
| SN74HCT540PWR | TSSOP20 package (SOT360-1), 4.4 mm body width; identical logic and DC specs but different thermal derating (10.0 mW/K above 100 °C). | Better suited for space-constrained PCBs where SO20 footprint is unavailable; lower thermal mass affects transient power handling. | Choose for high-density layouts where SO20 pad clearance is insufficient, accepting tighter thermal design margins. |
Compared with 74HCT540D,653, the 74HCT240D,653 offers functional flexibility at the cost of fixed polarity allocation per half-package, while the SN74HCT540PWR trades mechanical compatibility for board area savings-neither provides improved speed or drive strength.
Availability
74HCT540D,653 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, microcontroller address bus buffering, legacy system bus interface, and test equipment signal conditioning requiring stable component supply across extended temperature ranges.
Supply support for 74HCT540D,653 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 logic, analog, and MOSFET solutions optimized for efficiency, reliability, and manufacturability in industrial and automotive applications.
The 74HCT540 belongs to Nexperia's high-speed TTL-compatible logic family, designed specifically for robust interoperability with legacy 5 V systems while maintaining CMOS power efficiency and extended temperature resilience.
FAQ
Can 74HCT540D,653 operate at 3.3 V supply?
No. The 74HCT540 variant is specified only for 4.5 V to 5.5 V operation. At 3.3 V, input thresholds (VIH ≥ 2.0 V) become marginal, and output drive degrades significantly below 4.5 V. For 3.3 V systems, use the 74LVC540A or 74ALVC540, which are explicitly characterized at 3.3 V.
What is the maximum capacitive load this device can drive reliably?
74HCT540D,653 is characterized up to 50 pF load capacitance in dynamic tests. With proper PCB layout and decoupling, it reliably drives ≤ 70 pF while maintaining 26 ns max propagation delay and 41 ns max disable time. Loads exceeding 70 pF require series termination or buffer staging to avoid timing violations.
How do OE1 and OE2 interact when driven independently?
Both OE1 and OE2 are active-low and ORed internally: outputs go high-impedance if either OE1 or OE2 is HIGH. Driving them independently enables selective bus partitioning - e.g., holding OE1 LOW while pulsing OE2 HIGH disables only the second group of outputs if external logic gates the enables, though the base device itself performs logical OR, not AND.
Is this part suitable for automotive applications?
74HCT540D,653 is qualified for -40 °C to +125 °C operation and meets JEDEC standards, but it is not AEC-Q100 qualified. It may be used in non-safety-critical automotive auxiliary systems (e.g., infotainment power sequencing) with customer validation, but not in safety-related functions like braking or steering control.
74HCT540D,653 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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,653 FAQ
1.How can I place an order for 74HCT540D,653 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT540D,653 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,653 reliable?
The price and inventory of 74HCT540D,653 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT540D,653 is usually 5 days.
3.What payment methods are accepted for 74HCT540D,653?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT540D,653 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT540D,653?
74HCT540D,653 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT540D,653 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,653?
For technical support, including 74HCT540D,653 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT540D,653 requirements.
6.How does Aetrix verify that 74HCT540D,653 is sourced from the original manufacturer or authorized distributors?
All 74HCT540D,653 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,653 meets industry standards.
7.What is the process for return or replacement of 74HCT540D,653?
All 74HCT540D,653 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT540D,653, 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,653 part is unused and in its original packaging.
Return procedure for 74HCT540D,653:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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