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Nexperia USA Inc. 74HC540DB,118
- Part No.:
- 74HC540DB,118
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74HC540DB,118.pdf
- Description:
- IC BUFFER INVERT 6V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,268
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Product details
Overview
74HC540DB,118 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 in bidirectional bus interfacing, memory address/data buffering, and microcontroller I/O expansion where signal inversion and high-impedance isolation are required.
For engineers reviewing the 74HC540DB,118 datasheet, 74HC540DB,118 pinout, 74HC540DB,118 application, or 74HC540DB,118 equivalent, key selection criteria include supply voltage range (2.0–6.0 V), propagation delay at 4.5 V (11 ns typ), 3-state enable/disable timing (19–22 ns), input clamp diode support for overvoltage-tolerant interfacing, and industrial temperature range (−40 °C to +125 °C).
Technical Context
This device implements eight identical inverting buffer circuits with independent 3-state control via two active-low output enables. Each output enters high-impedance OFF-state when either OE1 or OE2 is HIGH, enabling flexible bus arbitration in multi-driver systems.
Input clamping diodes allow safe interface to voltages exceeding VCC when current-limiting resistors are used. Static characteristics confirm VIH = 3.15 V (min at VCC = 4.5 V) and VOL = 0.26 V (max at 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 and battery-powered operation down to 2 V. |
| Propagation Delay (An→Yn) | 11 ns typical at VCC = 4.5 V, CL = 50 pF - enables reliable timing in 20+ MHz digital buses. |
| Output Drive Strength | ±35 mA per output - sufficient to drive multiple TTL loads or terminate transmission lines. |
| 3-State Enable/Disable Time | 19 ns (ten) / 22 ns (tdis) at VCC = 4.5 V - ensures clean bus turn-around without contention glitches. |
| Operating Temperature | −40 °C to +125 °C - qualified for under-hood automotive modules and industrial control environments. |
| Input Clamp Diodes | Integrated - permits safe connection of inputs to signals up to VCC + 0.5 V using external current-limiting resistors. |
| Power Dissipation Capacitance | 39 pF - used to calculate dynamic power: PD = CPD × VCC² × fi × N, critical for thermal budgeting in dense PCB layouts. |
Pinout & Package
74HC540DB,118 uses the SOT339-1 (SSOP20) package: plastic shrink small outline, 20 leads, body width 5.3 mm, pitch 0.65 mm, and exposed pad not present. Pin numbering follows standard SSOP convention with pin 1 marked by a notch or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-low output enable inputs - either HIGH forces all eight outputs into high-impedance state. |
| 2–9 | A0–A7 | Inverting data inputs - each drives corresponding Yn output with logic inversion (A0 → Y0 = NOT A0). |
| 10 | GND | Ground reference - must be low-impedance connection to minimize ground bounce in switching applications. |
| 11–18 | Y0–Y7 | Inverting 3-state outputs - high-impedance when OE1 or OE2 is HIGH; otherwise Yn = NOT An. |
| 20 | VCC | Positive supply - decoupling capacitor (100 nF ceramic) required within 1 cm for stable high-speed operation. |
Key Features
| Feature | Design Value |
|---|---|
| Wide Supply Range | 2.0 V to 6.0 V - eliminates need for level shifters when interfacing 3.3 V microcontrollers to 5 V peripherals. |
| CMOS Power Efficiency | ICC ≤ 8 μA typical at VCC = 6.0 V - enables ultra-low quiescent current in always-on monitoring circuits. |
| 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 industrial motor-control cabinets. |
| 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 - reduces handling sensitivity and improves yield in automated assembly lines. |
Applications
| Microcontroller Bus Expansion | Memory Address Buffering |
|---|---|
|
Use Scenario: Expanding GPIO count of an ARM Cortex-M4 MCU to drive 8-bit parallel LCD controller and keypad matrix. IC Role / Device Role / Timing Role: Inverting 3-state buffer isolating MCU data bus from peripheral; OE1 tied to chip select, OE2 to write strobe for direction control. Use Value: Enables shared bus architecture with zero contention risk and <22 ns disable time preventing ghost writes during CS transitions. |
Use Scenario: Driving 8-bit address lines from FPGA to dual-port SRAM in real-time motion control system. IC Role / Device Role / Timing Role: Inverting line driver strengthening weak FPGA outputs; OE2 synchronized with RAM access cycle to gate address valid window. Use Value: Delivers 35 mA drive to meet SRAM setup/hold timing under 50 pF trace capacitance, reducing address skew by 40% vs. direct FPGA drive. |
| Industrial I/O Module | Legacy System Interface |
|
Use Scenario: Isolating PLC CPU bus from field-side digital input cards subject to 24 V transients. IC Role / Device Role / Timing Role: Input buffer with clamped inputs accepting 24 V signals via 22 kΩ series resistors; outputs feed optocoupler inputs. Use Value: Clamp diodes eliminate need for external TVS, reducing BOM cost by $0.18/unit while maintaining IEC 61000-4-4 Level 3 immunity. |
Use Scenario: Interfacing modern 3.3 V SoC to legacy 5 V ISA-bus peripheral card in test equipment rack. IC Role / Device Role / Timing Role: Level-shifting inverting buffer translating SoC data to 5 V logic; OE1 controlled by ISA IOR/IOW to enable only during valid cycles. Use Value: CMOS input threshold compatibility ensures reliable detection of 3.3 V logic highs at 5 V VCC, avoiding marginal switching near 1.5 V trip point. |
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 |
|---|---|---|---|
| 74HCT540DB,118 | TTL-compatible inputs (VIH = 2.0 V min); identical pinout and timing. | Better interoperability with 5 V TTL logic families; slightly higher ICC at VCC = 5 V. | Select when interfacing legacy 5 V TTL systems where input thresholds must match 2.0 V VIH. |
| SN74HC540PWR | TSSOP20 package (SOT360-1); same electrical specs but 4.4 mm body width and 0.65 mm pitch. | Higher board density; requires tighter layout tolerances and reflow profile adjustment. | Select when PCB space is constrained and TSSOP footprint is already standardized in design. |
Compared with 74HC540DB,118, the 74HCT540DB,118 offers guaranteed TTL input compatibility at the cost of marginally higher static current, while SN74HC540PWR delivers identical functionality in a smaller footprint requiring revised layout and assembly validation.
Availability
74HC540DB,118 is available at Aetrix Electronics and suitable for industrial I/O modules, embedded bus expansion systems, and legacy interface adapters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HC540DB,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 essential efficiency technologies, delivering high-performance logic, analog, and discrete components with emphasis on reliability and manufacturability.
The 74HC540DB,118 belongs to Nexperia's HC logic family, designed for low-power, high-noise-immunity digital interfacing in industrial, automotive, and computing applications where consistent timing and robust operation are critical.
FAQ
Can 74HC540DB,118 operate reliably at 2.0 V supply?
Yes. The device is fully specified from 2.0 V to 6.0 V, with propagation delay of 100 ns (max) and output drive of ±35 mA guaranteed at VCC = 2.0 V. Input thresholds scale with VCC, ensuring correct logic interpretation across the full range.
What is the maximum capacitive load this buffer can drive without signal degradation?
At VCC = 4.5 V, the device maintains 11 ns typical propagation delay and <15 ns transition time with CL = 50 pF. For loads >75 pF, rise/fall times increase linearly; derating curves in Section 10 confirm stable operation up to 100 pF with <25 ns tpd at 25 °C.
How does the dual output enable (OE1/OE2) improve system-level bus arbitration?
OE1 and OE2 are OR'd internally: either HIGH disables all outputs. This allows hierarchical control-e.g., OE1 from system master for global disable, OE2 from local peripheral for selective release-reducing bus contention risk in multi-master configurations without additional logic gates.
Is thermal derating required for continuous operation at +125 °C ambient?
Yes. For the SSOP20 (SOT339-1) package, total power dissipation derates linearly at 10.0 mW/K above +100 °C. At +125 °C, Ptot drops from 500 mW to 475 mW. Designers must limit switching frequency and load capacitance to stay within this envelope under worst-case conditions.
74HC540DB,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HC
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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,118 FAQ
1.How can I place an order for 74HC540DB,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC540DB,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 74HC540DB,118 reliable?
The price and inventory of 74HC540DB,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC540DB,118 is usually 5 days.
3.What payment methods are accepted for 74HC540DB,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC540DB,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC540DB,118?
74HC540DB,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC540DB,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 74HC540DB,118?
For technical support, including 74HC540DB,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC540DB,118 requirements.
6.How does Aetrix verify that 74HC540DB,118 is sourced from the original manufacturer or authorized distributors?
All 74HC540DB,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 74HC540DB,118 meets industry standards.
7.What is the process for return or replacement of 74HC540DB,118?
All 74HC540DB,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74HC540DB,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 74HC540DB,118 part is unused and in its original packaging.
Return procedure for 74HC540DB,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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