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NXP Semiconductors 74HCT7540N,112
- Part No.:
- 74HCT7540N,112
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
74HCT7540N,112.pdf
- Description:
- IC BUFFER INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,719
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Product details
Overview
74HCT7540N,112 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 levels, and operation across 4.5 V to 5.5 V supply. It delivers jitter-free signal conditioning for noisy industrial bus interfaces and supports high-noise immunity in motor control I/O expansion.
For engineers reviewing the 74HCT7540N,112 datasheet, 74HCT7540N,112 pinout, 74HCT7540N,112 application, or 74HCT7540N,112 equivalent, key selection criteria include its Schmitt-trigger hysteresis (0.17 V min at 4.5 V), 3-state enable timing (19 ns enable time), TTL-level input compatibility, and SO20 package thermal derating profile.
Technical Context
The 74HCT7540N,112 implements dual independent 3-state controls (OE1 and OE2) enabling flexible bus partitioning - both must be LOW for active output drive; either HIGH forces all eight Yn outputs into high-impedance. Its Schmitt-trigger inputs feature asymmetric thresholds (VT+ = 2.0 V, VT− = 0.64 V at VCC = 4.5 V), delivering 0.23 V hysteresis to reject slow-rising noise on long traces.
Static DC parameters are specified over −40 °C to +125 °C, with VOL ≤ 0.26 V at IO = 6.0 mA and VOH ≥ 3.7 V at same load. Dynamic performance includes 19 ns typical propagation delay (An to Yn), 12 ns transition time, and 31 pF power dissipation capacitance - all measured under 4.5 V supply and 50 pF load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Octal inverting buffer with Schmitt-trigger inputs and 3-state outputs |
| Supply Voltage Range | 4.5 V to 5.5 V - matches standard TTL systems without level-shifting |
| Input Compatibility | TTL-level - accepts 0.8 V max VIH and 2.0 V min VIL per JEDEC JESD7A |
| Propagation Delay | 19 ns typ (An → Yn, VCC = 4.5 V, CL = 50 pF) - suitable for ≤25 MHz bus toggling |
| Hysteresis Voltage | 0.23 V min (VCC = 4.5 V) - rejects >230 mV of low-frequency noise on input lines |
| Output Drive | ±6.0 mA (VOL ≤ 0.26 V, VOH ≥ 3.7 V) - drives standard 50 Ω transmission lines or multiple CMOS loads |
| Operating Temperature | −40 °C to +125 °C - qualified for under-hood automotive and industrial control environments |
Pinout & Package
74HCT7540N,112 is supplied in a plastic small outline package (SO20, SOT163-1) with 20 leads and 7.5 mm body width. Thermal derating begins at 109 °C (12.3 mW/K).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-low 3-state enables - independent control allows partial bus isolation |
| 2–9 | A0–A7 | Inverting data inputs with Schmitt-trigger thresholds - tolerate slow edges and EMI |
| 10 | GND | Ground reference - decoupling capacitor required within 10 mm of pin 10 and 20 |
| 11–18 | Y0–Y7 | Inverting 3-state outputs - high-Z state leakage < ±5.0 μA at +125 °C |
| 20 | VCC | Positive supply - must be bypassed with 100 nF ceramic capacitor near pin |
Key Features
| Feature | Design Value |
|---|---|
| Schmitt-trigger inputs | 0.23 V hysteresis at 4.5 V ensures clean digital transitions from noisy analog-like signals |
| Dual 3-state enables | Independent OE1/OE2 pins allow selective activation of output groups in multi-drop systems |
| TTL-compatible inputs | Accepts standard 5 V TTL logic thresholds - eliminates need for external level shifters |
| High noise immunity | CMOS design with >400 mV noise margin at VCC = 4.5 V under worst-case temp/voltage |
| Wide temperature range | Specified from −40 °C to +125 °C - supports engine control units and industrial PLCs |
Applications
| Industrial Bus Interface | Motor Control I/O Expansion |
|---|---|
Use Scenario: Isolating microcontroller GPIO from noisy 24 V fieldbus lines in factory automation cabinets. IC Role / Device Role / Timing Role: Inverting Schmitt buffer conditiones slow-rising encoder or limit-switch signals before MCU sampling. Use Value: 0.23 V hysteresis rejects contact bounce and EMI-induced glitches without software debouncing. |
Use Scenario: Driving optocoupler inputs for isolated gate drivers in 3-phase inverter control boards. IC Role / Device Role / Timing Role: Octal line driver provides TTL-compatible, current-limited outputs to interface MCU PWM logic with isolation stages. Use Value: ±6.0 mA drive capability directly sources optocoupler LEDs without external transistors. |
| Legacy System Signal Conditioning | Test Equipment Digital I/O |
Use Scenario: Interfacing modern 3.3 V FPGA I/O to legacy 5 V TTL backplanes in lab instrumentation upgrades. IC Role / Device Role / Timing Role: Level-translating buffer with noise rejection for reliable communication across mixed-voltage subsystems. Use Value: TTL input compatibility and 19 ns propagation delay preserve timing margins in 25 MHz control buses. |
Use Scenario: Providing programmable digital stimulus and response capture channels in automated test fixtures. IC Role / Device Role / Timing Role: 3-state outputs enable bidirectional DUT communication via shared test bus architecture. Use Value: Dual OE pins allow dynamic reconfiguration of I/O direction without changing PCB layout. |
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 | Same SO20 package, identical TTL input levels and 3-state function, but non-Schmitt inputs | Lacks hysteresis - unsuitable for noisy or slow-rising signals without external RC filtering | Select when interfacing clean logic sources where Schmitt triggering adds unnecessary delay |
| SN74HCT541N | PDIP-20 package, same electrical specs, but single OE pin instead of dual OE1/OE2 | Reduced bus partitioning flexibility - all eight outputs enable/disable simultaneously | Choose for cost-sensitive through-hole designs requiring only global 3-state control |
Compared with 74HCT7540N,112, the 74HCT240D,653 trades hysteresis for slightly lower propagation delay (17 ns), while SN74HCT541N sacrifices pin-level enable granularity for legacy through-hole compatibility - neither offers the combined Schmitt + dual-OE capability critical for robust industrial signal routing.
Availability
74HCT7540N,112 is available at Aetrix Electronics and suitable for industrial bus interface, motor control I/O expansion, legacy system signal conditioning, and test equipment digital I/O requiring stable component supply across extended temperature ranges.
Supply support for 74HCT7540N,112 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 leading semiconductor manufacturer specializing in high-performance logic, analog, and discrete components, with core expertise in reliability engineering and automotive-grade qualification.
The 74HCT7540N,112 belongs to Nexperia's 74HCT logic family, designed specifically for robust interoperability between TTL and CMOS systems in industrial and automotive control applications.
FAQ
What is the maximum supply voltage rating for the 74HCT7540N,112?
The absolute maximum supply voltage (VCC) for the 74HCT7540N,112 is +7.0 V, but recommended operation is limited to 4.5 V to 5.5 V per datasheet Table 5. Exceeding 5.5 V risks violating DC specifications and may accelerate parametric drift over temperature and lifetime - sustained operation above 5.5 V voids guaranteed performance for the 74HCT7540N,112.
Does the 74HCT7540N,112 support operation at −40 °C to +125 °C?
Yes, the 74HCT7540N,112 is fully specified and tested across −40 °C to +125 °C ambient temperature, including static parameters (VOH/VOL), dynamic timing (tpd, ten), and leakage currents (IOZ, II). This full-range qualification is explicitly stated in Tables 5, 6, and 7 of the Rev. 8 datasheet, confirming suitability for under-hood automotive and industrial control applications.
How does the dual output enable (OE1/OE2) function in the 74HCT7540N,112?
In the 74HCT7540N,112, both OE1 and OE2 must be LOW to activate output drivers; if either is HIGH, all eight Yn outputs enter high-impedance state. This dual-enable architecture allows hardware-level bus segmentation - for example, OE1 can control Y0–Y3 while OE2 controls Y4–Y7 - enabling partial bus isolation without software intervention or additional logic.
What is the input hysteresis voltage of the 74HCT7540N,112 at 4.5 V supply?
At VCC = 4.5 V, the 74HCT7540N,112 exhibits a minimum hysteresis voltage (VH) of 0.17 V, with typical value 0.23 V and maximum 0.23 V (Table 10). This is calculated as VT+ − VT− = 2.0 V − 0.64 V = 1.36 V nominal difference, but VH is defined as the differential threshold span - confirmed as 0.17 V min in the 74HCT7540N,112 transfer characteristics table.
Is the 74HCT7540N,112 pin-compatible with the 74HC7540N variant?
Yes, the 74HCT7540N,112 shares identical pinout, package (SO20/SOT163-1), and functional diagram with the 74HC7540N, but differs in input threshold levels: 74HCT7540N,112 uses TTL-compatible inputs (VIH = 2.0 V min), whereas 74HC7540N requires CMOS-level inputs (VIH = 3.15 V min at VCC = 4.5 V). Electrical substitution is possible only when driving source logic meets the respective input voltage requirements.
74HCT7540N,112 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, 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
74HCT7540N,112 FAQ
1.How can I place an order for 74HCT7540N,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT7540N,112 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 74HCT7540N,112 reliable?
The price and inventory of 74HCT7540N,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT7540N,112 is usually 5 days.
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Once your 74HCT7540N,112 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 74HCT7540N,112?
For technical support, including 74HCT7540N,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT7540N,112 requirements.
6.How does Aetrix verify that 74HCT7540N,112 is sourced from the original manufacturer or authorized distributors?
All 74HCT7540N,112 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 74HCT7540N,112 meets industry standards.
7.What is the process for return or replacement of 74HCT7540N,112?
All 74HCT7540N,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT7540N,112, 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 74HCT7540N,112 part is unused and in its original packaging.
Return procedure for 74HCT7540N,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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