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Nexperia USA Inc. 74HC7540DB,112
- Part No.:
- 74HC7540DB,112
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74HC7540DB,112.pdf
- Description:
- IC BUFFER INVERT 6V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,312
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Product details
Overview
74HC7540DB,112 from Nexperia is an octal inverting Schmitt-trigger buffer/line driver with 3-state outputs, dual active-low output enables (OE1, OE2), and CMOS-level inputs. It operates from 2.0 V to 6.0 V, delivers ±35 mA output drive, supports -40 °C to +125 °C ambient range, and is packaged in SSOP20 (SOT339-1). It is used in industrial bus interface circuits requiring noise-immune signal conditioning and bidirectional bus isolation.
For engineers reviewing the 74HC7540DB,112 datasheet, 74HC7540DB,112 pinout, 74HC7540DB,112 application, or 74HC7540DB,112 equivalent, key selection factors include Schmitt-trigger hysteresis (0.3–0.5 V at VCC = 6.0 V), propagation delay (11–20 ns at VCC = 6.0 V), dual enable control for flexible bus arbitration, and input clamping diodes enabling overvoltage-tolerant interfacing.
Technical Context
This device implements eight independent inverting buffer channels, each with Schmitt-trigger input thresholds (VT+ = 4.2 V, VT− = 1.8 V at VCC = 6.0 V) and high-impedance 3-state outputs controlled by two separate active-low enables. Its dual-OE architecture allows independent gating of output groups or synchronized bus release.
The input clamping diodes permit direct connection to signals exceeding VCC when used with current-limiting resistors, while the hysteresis ensures clean digital transitions from slow-rising or noisy analog-like waveforms - critical in industrial sensor interfaces and legacy bus termination.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 2.0 V to 6.0 V - supports mixed-voltage system interfacing and battery-backed operation down to 2 V. |
| Output drive | ±35 mA - sufficient to directly drive LED indicators, TTL loads, or terminated transmission lines without external buffers. |
| Propagation delay | 11 ns (typ) at VCC = 6.0 V, CL = 50 pF - enables reliable timing in 45 MHz+ data paths with margin. |
| Schmitt hysteresis | 0.3 V (min) to 0.5 V (typ) at VCC = 6.0 V - rejects up to 500 mV of low-frequency noise on input signals. |
| Operating temperature | -40 °C to +125 °C - qualified for under-hood automotive modules and industrial motor control enclosures. |
| Input leakage | ±0.1 μA (max) at VCC = 6.0 V - minimizes loading on high-impedance sensor outputs and RC timing networks. |
| Power dissipation | 500 mW (max) - derates linearly above 109 °C for SO20; compatible with standard PCB thermal relief patterns. |
Pinout & Package
Packaged in SSOP20 (SOT339-1), a 20-pin plastic shrink small outline package with 0.65 mm lead pitch and 7.2 mm body width - optimized for high-density industrial PCB layouts with improved thermal resistance vs. TSSOP.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-low output enable inputs - both must be LOW for output assertion; independent control enables partial bus activation. |
| 2–9 | A0–A7 | Inverting data inputs - Schmitt-triggered to convert slow/noisy signals into clean logic edges before inversion. |
| 10 | GND | Ground reference - decoupling capacitor must be placed within 5 mm to minimize ground bounce during 3-state transitions. |
| 11–18 | Y0–Y7 | Inverting 3-state outputs - HIGH-impedance when either OE is HIGH; sink/source capable of ±35 mA in active state. |
| 20 | VCC | Positive supply - requires local 100 nF ceramic bypass capacitor; voltage must remain within 2.0–6.0 V for guaranteed timing. |
Key Features
| Feature | Design Value |
|---|---|
| Wide supply range | 2.0 V to 6.0 V - eliminates level-shifter requirements when interfacing 3.3 V microcontrollers to 5 V peripherals. |
| Schmitt-trigger inputs | VT+ = 4.2 V, VT− = 1.8 V at VCC = 6.0 V - provides 2.4 V hysteresis to reject EMI in factory-floor wiring environments. |
| Dual output enables | OE1 and OE2 are independent - enables time-multiplexed bus sharing between two controller domains without external logic. |
| Input clamp diodes | Rated for ±20 mA clamping current - permits safe interfacing to 12 V sensor outputs using 10 kΩ series resistors. |
| High noise immunity | CMOS input structure with >50% VCC noise margin - maintains logic integrity in 100 mVpp conducted noise environments. |
Applications
| Industrial PLC I/O Expansion | Legacy Bus Signal Conditioning |
|---|---|
Use Scenario: Isolating and buffering 24 V DC sensor inputs to a 3.3 V ARM-based PLC CPU via optocoupler interfaces. IC Role / Device Role / Timing Role: Inverting Schmitt buffer converting slow-rising industrial sensor edges into jitter-free logic levels; dual OE enables synchronized scan-group updates. Use Value: Eliminates external RC filters and reduces firmware debouncing overhead by providing deterministic edge timing with 11 ns max propagation delay. |
Use Scenario: Driving RS-422 differential receivers from a microcontroller GPIO bank with marginal rise time and long trace lengths. IC Role / Device Role / Timing Role: Line driver with ±35 mA output strength and Schmitt input hysteresis to regenerate degraded bus signals before differential conversion. Use Value: Restores signal integrity across 1 m PCB traces without adding propagation skew; 0.5 V hysteresis suppresses crosstalk-induced glitches. |
| Automotive Body Control Module | Test Equipment Digital Pattern Generator |
Use Scenario: Interfacing mechanical switch inputs (with contact bounce and EMI) to a CAN node MCU in door module assemblies. IC Role / Device Role / Timing Role: Input conditioner transforming noisy switch closures into clean, debounced logic edges; 3-state outputs allow shared diagnostic bus access. Use Value: Reduces MCU interrupt load and eliminates need for software debounce timers; -40 °C to +125 °C rating matches under-dash thermal profile. |
Use Scenario: Generating precise, glitch-free stimulus waveforms for DUT testing where output impedance matching and fast edge rates are required. IC Role / Device Role / Timing Role: High-speed inverting buffer with 4 ns transition time (typ) and 11 ns propagation delay - ensures sub-20 ns timing resolution. Use Value: Enables accurate setup/hold timing verification for ASICs and FPGAs; 3-state capability supports multi-channel waveform multiplexing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HC7541DB,112 | Non-inverting output logic; identical pinout, supply, and timing specs. | Used where signal polarity preservation is required (e.g., direct replacement in non-inverting bus drivers). | Select when system logic demands true (non-inverted) output mapping without redesigning downstream gates. |
| SN74HCT244PWR | Non-Schmitt inputs; TTL-compatible; 8-bit non-inverting; different pinout (20-pin TSSOP, but A/B side separation). | Suitable for clean digital buses (e.g., memory address latching) but lacks noise rejection for sensor inputs. | Choose only for noise-free, high-speed digital interconnects where Schmitt triggering is unnecessary and pin compatibility is not required. |
Compared with 74HC7540DB,112, the 74HC7541DB,112 preserves signal polarity at identical performance and footprint, while SN74HCT244PWR trades hysteresis for TTL-level compatibility and higher drive at the cost of noise resilience - making it unsuitable for industrial sensor front-ends.
Availability
74HC7540DB,112 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, legacy bus signal conditioning, and test equipment digital pattern generation requiring stable component supply across extended temperature ranges.
Supply support for 74HC7540DB,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 global semiconductor expert focused on essential efficiency technologies, delivering high-performance logic, discrete, and MOSFET solutions for automotive, industrial, and consumer markets.
The 74HC7540 series belongs to Nexperia's HC logic family, designed specifically for robust, low-power, wide-supply digital interfacing in harsh electromagnetic environments - emphasizing noise immunity, thermal stability, and long-term supply assurance.
FAQ
What is the maximum clock frequency supported by the 74HC7540DB,112?
The 74HC7540DB,112 does not operate as a clocked device but as a combinatorial buffer. Its usable data rate is determined by propagation delay (11 ns typ at VCC = 6.0 V) and transition time (4 ns typ), supporting clean signal transmission up to ~45 MHz in point-to-point configurations with proper termination and layout.
Can OE1 and OE2 be tied together for single-enable operation?
Yes - OE1 and OE2 may be connected to a common control line. The functional table confirms that a HIGH on either OE forces all outputs to high-impedance, so tying them simplifies control logic without affecting electrical behavior or timing specifications.
Does the 74HC7540DB,112 support hot insertion or live bus swapping?
No - the device lacks explicit hot-swap protection features such as power-up 3-state or undervoltage lockout. While its input clamping diodes tolerate brief overvoltage, simultaneous VCC and signal application during insertion can cause latch-up or excessive current; external hot-swap controllers are recommended for live-backplane use.
How does the Schmitt trigger threshold vary with supply voltage?
Thresholds scale approximately linearly: VT+ = 0.7 × VCC (typ), VT− = 0.3 × VCC (typ), yielding hysteresis ≈ 0.4 × VCC. At VCC = 2.0 V, VT+ ≈ 1.4 V and VT− ≈ 0.6 V; at VCC = 6.0 V, VT+ = 4.2 V and VT− = 1.8 V - confirmed in Table 10 of the datasheet.
74HC7540DB,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HC
- Package/Case:
- 20-SSOP (0.209", 5.30mm 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:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
74HC7540DB,112 FAQ
1.How can I place an order for 74HC7540DB,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC7540DB,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 74HC7540DB,112 reliable?
The price and inventory of 74HC7540DB,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC7540DB,112 is usually 5 days.
3.What payment methods are accepted for 74HC7540DB,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC7540DB,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC7540DB,112?
74HC7540DB,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC7540DB,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 74HC7540DB,112?
For technical support, including 74HC7540DB,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC7540DB,112 requirements.
6.How does Aetrix verify that 74HC7540DB,112 is sourced from the original manufacturer or authorized distributors?
All 74HC7540DB,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 74HC7540DB,112 meets industry standards.
7.What is the process for return or replacement of 74HC7540DB,112?
All 74HC7540DB,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74HC7540DB,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 74HC7540DB,112 part is unused and in its original packaging.
Return procedure for 74HC7540DB,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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