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Nexperia USA Inc. 74HC540DB,112
- Part No.:
- 74HC540DB,112
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74HC540DB,112.pdf
- Description:
- IC BUFFER INVERT 6V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,399
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Product details
Overview
74HC540DB,112 from Nexperia is an octal inverting 3-state buffer/line driver in SSOP20 package, operating from 2.0 V to 6.0 V supply, featuring dual active-low output enables (OE1, OE2), CMOS-level inputs, and ±35 mA output drive capability. It is used for bidirectional bus interfacing, address/data latching, and memory I/O isolation in industrial control logic systems.
For engineers reviewing the 74HC540DB,112 datasheet, 74HC540DB,112 pinout, 74HC540DB,112 application, or 74HC540DB,112 equivalent, key selection criteria include propagation delay (9–30 ns at VCC = 4.5–6.0 V), 3-state enable/disable timing (15–48 ns), input clamp diode support for overvoltage-tolerant interfacing, and -40 °C to +125 °C temperature rating.
Technical Context
This device implements eight identical inverting buffer circuits with independent 3-state control via two active-low output enable inputs (OE1, OE2). When either OE is HIGH, all eight outputs enter high-impedance OFF-state-enabling shared-bus contention management without external logic.
Input clamping diodes allow safe interface to signals exceeding VCC when current-limiting resistors are used. Static characteristics guarantee VIH ≥ 3.15 V and VOL ≤ 0.26 V at VCC = 4.5 V and IO = 6.0 mA, ensuring robust noise immunity and TTL-compatible output levels under load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0 V to 6.0 V - supports mixed-voltage system interfacing (e.g., 3.3 V logic driving 5 V bus) |
| Propagation Delay (tpd) | 9 ns (typ) at VCC = 6.0 V, CL = 50 pF - enables sub-100 MHz bus operation with deterministic timing |
| Output Drive Current | ±35 mA - sufficient to directly drive LEDs, relays, or multiple CMOS/TTL loads without buffers |
| 3-State Enable Time (ten) | 15 ns (max) at VCC = 6.0 V - ensures fast bus arbitration and minimal contention window |
| Input Clamp Diodes | Integrated - permits safe connection of inputs to voltages > VCC when series resistors limit current to ≤ ±20 mA |
| Operating Temperature | -40 °C to +125 °C - qualified for under-hood industrial and extended-range embedded applications |
| Power Dissipation (Ptot) | 500 mW (SSOP20, derated 10.0 mW/K above 100 °C) - defines thermal design margin for sustained 8-bit switching |
Pinout & Package
74HC540DB,112 uses the SOT339-1 (SSOP20) package: plastic shrink small outline, 20 leads, 5.3 mm body width, 0.65 mm lead pitch, and exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-low output enable inputs - either HIGH forces all Yn outputs into high-impedance state |
| 2–9 | A0–A7 | Inverting data inputs - each drives corresponding Yn output with logical inversion |
| 10 | GND | Ground reference - must be low-impedance return path for all internal logic and output currents |
| 11–18 | Y0–Y7 | Inverting 3-state outputs - mirror A0–A7 with inversion; tri-stated when OE1 or OE2 = HIGH |
| 20 | VCC | Positive supply - powers internal logic and output drivers; decoupling capacitor required near pin |
Key Features
| Feature | Design Value |
|---|---|
| Wide Supply Range | 2.0 V to 6.0 V - eliminates need for level shifters between 2.5 V, 3.3 V, and 5 V subsystems |
| CMOS Low Power | ICC ≤ 160 μA at VCC = 6.0 V, full temperature range - reduces static power in always-on control modules |
| High Noise Immunity | VIH ≥ 3.15 V / VIL ≤ 1.35 V at VCC = 4.5 V - provides >1.8 V noise margin against EMI in motor-drive environments |
| Latch-Up Robustness | Exceeds 100 mA per JESD78 Class II Level B - prevents destructive latch-up during transient overvoltage events |
| ESD Protection | HBM > 2000 V, CDM > 1000 V - withstands handling and board assembly without special ESD controls |
Applications
| Industrial PLC Backplane Interface | Microcontroller GPIO Expansion |
|---|---|
Use Scenario: Isolating microcontroller port pins from noisy 24 V DC I/O modules on a programmable logic controller backplane. IC Role / Device Role: Inverting 3-state buffer providing voltage-level translation and bus contention protection between MCU and field-side peripherals. Use Value: Dual OE inputs allow synchronized enable/disable of all eight lines during hot-swap events, preventing bus glitches during module insertion/removal. |
Use Scenario: Expanding limited GPIO count of an ARM Cortex-M0+ MCU to drive eight discrete indicators and sensors in a smart sensor node. IC Role / Device Role: Octal inverting line driver buffering MCU outputs while providing ±35 mA sink/source per channel for LED and relay loads. Use Value: Integrated input clamp diodes permit direct connection to 5 V sensor outputs without external protection, reducing BOM count by two diodes per channel. |
| Memory Address Latching | Legacy Parallel Bus Isolation |
Use Scenario: Driving address lines to SRAM and EPROM chips in a retro-computing FPGA-based system with strict setup/hold timing. IC Role / Device Role: Inverting buffer with predictable 9 ns tpd (VCC = 6.0 V) delivering clean, slew-controlled address transitions to memory devices. Use Value: Tight propagation delay variation (±3 ns across temperature) ensures consistent address valid windows, eliminating timing closure issues in 16-bit bus designs. |
Use Scenario: Isolating legacy parallel printer port signals (STROBE, ACK, BUSY) from modern USB-to-parallel bridge ICs in industrial HMI panels. IC Role / Device Role: 3-state octal buffer enabling bidirectional signal direction control and bus contention avoidance during handshaking. Use Value: Independent OE1/OE2 allows separate control of data vs. control lines, simplifying firmware-driven handshake sequencing without additional logic gates. |
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 |
|---|---|---|---|
| 74HC540D,653 | SO20 package (SOT163-1), 7.5 mm body width, higher Ptot (500 mW derated at 12.3 mW/K above 109 °C) | Better thermal dissipation in high-power continuous switching; larger footprint limits dense PCB layouts | Select when board space permits and thermal load exceeds SSOP20 derating margin at >100 °C ambient |
| SN74HC540PWR | TSSOP20 (SOT360-1), 4.4 mm body width, CPD = 44 pF vs. 39 pF, same electrical specs | Smaller footprint than SSOP20 but lower creepage/clearance; slightly higher dynamic power at high-frequency switching | Select for ultra-compact routing where 0.9 mm width reduction justifies marginal CPD increase and tighter solder joint reliability scrutiny |
Compared with 74HC540D,653 and SN74HC540PWR, the 74HC540DB,112 offers optimal balance of thermal performance, board area, and manufacturability for high-volume industrial PCBs-its 5.3 mm SSOP20 width fits standard pick-and-place nozzles while maintaining 10.0 mW/K derating above 100 °C.
Availability
74HC540DB,112 is available at Aetrix Electronics and suitable for industrial PLC backplanes, microcontroller GPIO expansion, memory address latching, and legacy parallel bus isolation requiring stable component supply across extended temperature ranges.
Supply support for 74HC540DB,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, analog, and MOSFET solutions for automotive, industrial, and consumer markets.
The 74HC540 family belongs to Nexperia's broad portfolio of 74HC/HCT logic ICs designed specifically for robust, low-power, wide-supply-voltage digital interfacing in harsh industrial and extended-temperature environments.
FAQ
What is the maximum clock frequency supported by 74HC540DB,112?
The 74HC540DB,112 is not a clocked device-it has no internal clock and operates asynchronously. Its usable data rate depends on propagation delay (9–30 ns) and system timing margins. For clean 50% duty-cycle signals, it reliably supports bus toggle rates up to ~30 MHz in typical 50 pF load conditions, assuming adequate setup/hold times are met externally.
Can OE1 and OE2 be tied together for single-enable operation?
Yes-OE1 and OE2 can be connected to a common control signal. The functional table confirms that a HIGH on either OE forces all outputs into high-impedance state; tying them together maintains full 3-state functionality with simplified control. No additional pull-up/down resistors are needed if driven actively.
Does 74HC540DB,112 support mixed-voltage operation (e.g., 3.3 V inputs driving 5 V outputs)?
No-the 74HC540DB,112 is a non-level-shifting buffer: output voltage swing is rail-to-rail within VCC (0 V to VCC). To interface 3.3 V logic to a 5 V bus, VCC must be set to 5 V, and inputs must tolerate 5 V. Its CMOS inputs do accept 3.3 V as valid HIGH when VCC = 5 V (VIH min = 3.15 V), satisfying this use case safely.
Is there a pin-compatible automotive-grade version of this part?
No-74HC540DB,112 is not automotive-qualified. Nexperia does not list an AEC-Q100 qualified variant of the 74HC540 in SSOP20. For automotive applications, consider the pin-compatible 74HC540-Q100 (available in SO20 only, D package) which undergoes full AEC-Q100 stress testing and is rated for -40 °C to +125 °C with enhanced reliability screening.
74HC540DB,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HC
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Bulk
- 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
74HC540DB,112 FAQ
1.How can I place an order for 74HC540DB,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC540DB,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 74HC540DB,112 reliable?
The price and inventory of 74HC540DB,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC540DB,112 is usually 5 days.
3.What payment methods are accepted for 74HC540DB,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC540DB,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC540DB,112?
74HC540DB,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC540DB,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 74HC540DB,112?
For technical support, including 74HC540DB,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC540DB,112 requirements.
6.How does Aetrix verify that 74HC540DB,112 is sourced from the original manufacturer or authorized distributors?
All 74HC540DB,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 74HC540DB,112 meets industry standards.
7.What is the process for return or replacement of 74HC540DB,112?
All 74HC540DB,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74HC540DB,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 74HC540DB,112 part is unused and in its original packaging.
Return procedure for 74HC540DB,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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