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Nexperia USA Inc. 74HCT7540D,118
- Part No.:
- 74HCT7540D,118
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74HCT7540D,118.pdf
- Description:
- IC BUFFER INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:340
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Product details
Overview
74HCT7540D,118 from Nexperia is an octal inverting Schmitt-trigger buffer/line driver with 3-state outputs, dual active-low output enables (OE1, OE2), TTL-compatible input thresholds, and SO20 (SOT163-1) packaging. It operates from 4.5 V to 5.5 V, delivers ±6 mA output drive at VCC = 4.5 V, and supports industrial temperature range (−40 °C to +125 °C). It is used in noise-prone digital bus interfacing and level translation between legacy TTL and CMOS systems.
For engineers reviewing the 74HCT7540D,118 datasheet, 74HCT7540D,118 pinout, 74HCT7540D,118 application, or 74HCT7540D,118 equivalent, key selection criteria include Schmitt-trigger hysteresis (0.23 V typ), propagation delay (19 ns typ @ 4.5 V, CL = 50 pF), dual enable control timing, 3-state leakage (±5.0 μA max), and SO20 thermal derating (12.3 mW/K above 109 °C).
Technical Context
This device implements eight independent inverting buffer channels, each with Schmitt-trigger inputs that convert slow-rising/falling signals into clean digital transitions using a 0.23 V typical hysteresis voltage (VH) at VCC = 4.5 V. Input thresholds are fixed at VT+ = 2.0 V and VT− = 0.7 V, ensuring robust TTL-level compatibility.
Output control uses two separate active-low enables (OE1, OE2): both must be LOW for normal inverting operation; either HIGH forces all eight outputs (Y0–Y7) into high-impedance state. The SO20 package provides 20-pin surface-mount compatibility with 7.5 mm body width and defined thermal derating behavior above 109 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures interoperability with standard 5 V TTL logic families and stable operation across industrial supply tolerances. |
| Input Thresholds | VT+ = 2.0 V, VT− = 0.7 V - Guarantees reliable recognition of TTL logic levels under varying noise and slew-rate conditions. |
| Output Drive | ±6.0 mA @ VCC = 4.5 V - Sufficient to drive standard 50 pF loads and multiple CMOS inputs without external buffering. |
| Propagation Delay | 19 ns typ (An → Yn, VCC = 4.5 V, CL = 50 pF) - Enables use in 25 MHz+ digital control and data routing applications. |
| Hysteresis Voltage | 0.23 V typ - Provides noise immunity against up to ~230 mV of input signal ripple or EMI-induced jitter. |
| 3-State Leakage | ±5.0 μA max @ −40 °C to +125 °C - Minimizes bus contention current when outputs are disabled in multi-driver systems. |
| Power Dissipation | 500 mW max (SO20), derates 12.3 mW/K above 109 °C - Defines safe continuous power envelope for PCB thermal design. |
Pinout & Package
74HCT7540D,118 is housed in a plastic small outline package (SO20, SOT163-1) with 20 leads and 7.5 mm body width. Pin 1 is index-marked; pins are arranged in two rows with GND (pin 10) and VCC (pin 20) on opposite corners for optimal decoupling layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-low output enable inputs - Both must be LOW for functional output; either HIGH places all Yn outputs in high-Z state. |
| 2–9 | A0–A7 | Inverting data inputs - Accept TTL-level signals; Schmitt-trigger action cleans slow or noisy waveforms before inversion. |
| 10 | GND | Ground reference - Must be low-impedance connection to minimize ground bounce during simultaneous 3-state transitions. |
| 11–18 | Y0–Y7 | Inverting 3-state outputs - Drive external loads only when OE1 = OE2 = LOW; otherwise present >10⁶ Ω impedance. |
| 20 | VCC | Positive supply - Requires local 100 nF ceramic decoupling capacitor placed within 5 mm of this pin for stable switching. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | VIH = 2.0 V min, VIL = 0.8 V max - Directly interfaces with legacy 5 V TTL outputs without level-shifting circuitry. |
| Schmitt-trigger hysteresis | 0.23 V typical at VCC = 4.5 V - Rejects noise spikes ≤230 mV amplitude on input lines, critical for long-trace or unshielded environments. |
| Dual 3-state enables | Independent OE1/OE2 control - Allows flexible bus arbitration: one enable can gate half the outputs while the other controls the remainder. |
| Wide temperature range | −40 °C to +125 °C operation - Qualified for under-hood automotive modules, industrial PLC I/O, and outdoor telecom equipment. |
| ESD robustness | HBM >2000 V, CDM >1000 V - Survives handling and board assembly without special ESD precautions beyond standard IPC-610 practices. |
Applications
| Industrial Bus Interface | Legacy System Level Translation |
|---|---|
Use Scenario: Interfacing microcontroller GPIO banks to noisy 24 V industrial fieldbus nodes via optocoupler-isolated 5 V logic rails. IC Role / Device Role / Timing Role: Inverting buffer with Schmitt inputs cleans slow optocoupler rise/fall times and drives bus transceivers with controlled edge rates. Use Value: Eliminates need for external RC filtering or dedicated line receivers; 0.23 V hysteresis suppresses EFT-induced glitches on factory floor wiring. |
Use Scenario: Upgrading aging 8051-based instrumentation with modern FPGA peripherals while retaining original TTL-based front-panel displays. IC Role / Device Role / Timing Role: Bidirectional level translator and signal conditioner between FPGA's 3.3 V CMOS outputs and 5 V display driver inputs. Use Value: TTL input thresholds accept 3.3 V logic highs directly; inverting function matches legacy display enable polarity without redesigning firmware. |
| Programmable Logic Expansion | Noise-Immune Sensor Signal Conditioning |
Use Scenario: Adding parallel I/O capability to a CPLD-based motion controller by expanding address/data bus to external latch arrays. IC Role / Device Role / Timing Role: Octal 3-state buffer isolates CPLD outputs during configuration and enables deterministic bus turn-around timing. Use Value: Dual OE inputs allow synchronous gating of latched data vs. address phases; 19 ns propagation ensures setup/hold compliance at 20 MHz bus clocks. |
Use Scenario: Conditioning analog-to-digital converter (ADC) reference clock edges in a high-voltage power supply monitor where transformer-coupled clocks exhibit ringing. IC Role / Device Role / Timing Role: Schmitt-trigger buffer converts damped sinusoidal clock edges into jitter-free square waves for ADC sampling synchronization. Use Value: 0.23 V hysteresis rejects sub-200 mV ringing artifacts; 19 ns delay adds predictable, stable phase offset for precise timing calibration. |
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 |
|---|---|---|---|
| 74HCT240D,653 | Non-Schmitt inputs; identical SO20 package, same VCC range and drive strength. | Lacks noise immunity on slow edges; requires clean input signals or external RC conditioning. | Select when interfacing to fast, low-noise sources (e.g., FPGA outputs) and cost sensitivity outweighs hysteresis benefit. |
| SN74HCT541PW | Texas Instruments part; non-inverting outputs, TSSOP-20 package, same electrical specs except VIH/VIL tighter. | Requires logic inversion elsewhere in design; smaller footprint but higher thermal resistance than SO20. | Choose for space-constrained PCBs where non-inverting function aligns with system architecture and thermal margin permits TSSOP use. |
Compared with 74HCT240D,653, the 74HCT7540D,118 adds essential Schmitt-trigger noise rejection at no cost penalty; versus SN74HCT541PW, it trades inversion polarity and thermal performance for superior EMI resilience in electrically harsh environments.
Availability
74HCT7540D,118 is available at Aetrix Electronics and suitable for industrial bus interface, legacy system level translation, programmable logic expansion, and noise-immune sensor signal conditioning requiring stable component supply across extended temperature ranges.
Supply support for 74HCT7540D,118 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 high-volume, high-reliability logic, discrete, and MOSFET solutions for automotive, industrial, and consumer markets.
The 74HCT7540 series belongs to Nexperia's industry-standard logic portfolio, designed specifically for robust digital interfacing in electrically noisy, thermally demanding applications where signal integrity and long-term supply stability are critical.
FAQ
What is the maximum recommended operating frequency for 74HCT7540D,118 in a 50 pF load environment?
The device supports reliable operation up to approximately 25 MHz, derived from its typical 19 ns propagation delay (An → Yn) under VCC = 4.5 V and CL = 50 pF conditions. At higher frequencies, ensure output load capacitance remains ≤50 pF and maintain tight VCC decoupling to avoid timing violations due to supply droop.
Can OE1 and OE2 be tied together for single-enable operation?
Yes - OE1 and OE2 may be connected to a common control signal without adverse effects, as both are active-low and electrically identical. This simplifies PCB routing and reduces GPIO usage, though it eliminates independent gating of output subsets. No additional pull-up or series resistance is required.
Does 74HCT7540D,118 support mixed-voltage operation (e.g., 3.3 V inputs driving a 5 V VCC rail)?
No - the device is not designed for mixed-voltage operation. Inputs must remain within GND to VCC (4.5–5.5 V); applying 3.3 V signals risks violating the minimum VIH requirement of 2.0 V, potentially causing undefined output states. Use a dedicated level shifter for cross-voltage interfacing.
How does the Schmitt-trigger input affect power consumption during slow input transitions?
Unlike standard CMOS inputs, Schmitt-trigger inputs draw negligible additional current during slow transitions because the internal hysteresis is implemented via feedback resistors, not dynamic charging. ICC remains ≤160 μA over temperature, unaffected by input slew rate - unlike non-Schmitt buffers that may oscillate and increase dynamic current.
74HCT7540D,118 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
74HCT7540D,118 FAQ
1.How can I place an order for 74HCT7540D,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT7540D,118 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 74HCT7540D,118 reliable?
The price and inventory of 74HCT7540D,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT7540D,118 is usually 5 days.
3.What payment methods are accepted for 74HCT7540D,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT7540D,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT7540D,118?
74HCT7540D,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT7540D,118 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 74HCT7540D,118?
For technical support, including 74HCT7540D,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT7540D,118 requirements.
6.How does Aetrix verify that 74HCT7540D,118 is sourced from the original manufacturer or authorized distributors?
All 74HCT7540D,118 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 74HCT7540D,118 meets industry standards.
7.What is the process for return or replacement of 74HCT7540D,118?
All 74HCT7540D,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT7540D,118, 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 74HCT7540D,118 part is unused and in its original packaging.
Return procedure for 74HCT7540D,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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