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Nexperia USA Inc. 74HC540D,652
- Part No.:
- 74HC540D,652
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74HC540D,652.pdf
- Description:
- IC BUFFER INVERT 6V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,536
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Product details
Overview
74HC540D,652 from Nexperia is an octal inverting 3-state buffer/line driver in SO20 (SOT163-1) 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 serves as a bidirectional bus interface or address/data line driver in microcontroller peripheral expansion, memory interfacing, and industrial control I/O buffering.
For engineers reviewing the 74HC540D,652 datasheet, 74HC540D,652 pinout, 74HC540D,652 application, or 74HC540D,652 equivalent, key selection criteria include 3-state timing (tpd ≤ 20 ns at VCC = 4.5 V), input voltage compatibility (VIH = 3.15 V min at VCC = 4.5 V), thermal robustness (–40 °C to +125 °C), and SO20 package mechanical fit for legacy PCB layouts.
Technical Context
This device implements eight identical inverting buffer circuits with independent high-impedance control via two active-low output enable inputs. Its logic function follows Yn = NOT(An) when OE1 = OE2 = LOW; otherwise all outputs enter high-Z state regardless of input states.
The design supports mixed-voltage system interfacing via input clamp diodes enabling current-limited overvoltage tolerance, and meets JEDEC JESD7A (2.0–6.0 V) and JESD8C (2.7–3.6 V) standards. Static and dynamic parameters are fully characterized across –40 °C to +125 °C, with propagation delay (An→Yn) of 11 ns typical and 30 ns max at VCC = 4.5 V and CL = 50 pF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0 V to 6.0 V - Enables direct interface with 3.3 V and 5 V logic families without level shifters. |
| Output Drive Capability | ±35 mA per output - Sufficient to drive standard TTL loads or multiple CMOS inputs without external buffers. |
| Propagation Delay (An→Yn) | 11 ns (typ) / 30 ns (max) at VCC = 4.5 V, CL = 50 pF - Supports reliable operation in 33 MHz bus systems with margin. |
| Enable/Disable Time | 19 ns (ten typ) / 22 ns (tdis typ) at VCC = 4.5 V - Ensures clean bus arbitration during hot-swap or multiplexed data transfers. |
| Input Voltage Thresholds | VIH = 3.15 V min, VIL = 1.35 V max at VCC = 4.5 V - Guarantees noise immunity >1.1 V under worst-case conditions. |
| Operating Temperature | –40 °C to +125 °C - Qualified for industrial and extended-temperature embedded applications without derating. |
| Power Dissipation | 500 mW (SO20 package, T ≤ 109 °C) - Supports continuous operation in compact enclosures with passive cooling. |
Pinout & Package
74HC540D,652 uses the SO20 plastic small outline package (SOT163-1), 20-pin, 7.5 mm body width, with standard 1.27 mm pitch and gull-wing leads. Pin 1 is marked by a bevelled corner or dot; pin numbering proceeds counterclockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-low output enable inputs - Both must be LOW for functional output; either HIGH forces all Yn into high-impedance state. |
| 2–9 | A0–A7 | Inverting data inputs - Each drives corresponding Yn with logical inversion; clamped for overvoltage protection. |
| 10 | GND | Ground reference - Must be low-impedance connection to minimize switching noise coupling. |
| 11–18 | Y7–Y0 | Inverting 3-state outputs - Outputs Y0–Y7 mirror A0–A7 with inversion and controlled by OE1/OE2. |
| 20 | VCC | Positive supply - Decoupling capacitor (100 nF ceramic) required within 10 mm of this pin for stable operation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent output enables | OE1 and OE2 allow hierarchical bus control - e.g., OE1 for global disable, OE2 for local subsystem gating. |
| Input clamp diodes | Enable safe interface to voltages up to VCC + 0.5 V using series current-limiting resistors - eliminates need for external protection. |
| High noise immunity | Typical noise margin >1.1 V at VCC = 4.5 V - reduces susceptibility to crosstalk in dense PCB layouts. |
| Latch-up immunity | Exceeds 100 mA per JESD78 Class II Level B - ensures robustness against transient ground bounce or supply glitches. |
| ESD protection | HBM >2000 V, CDM >1000 V - meets industrial handling requirements without additional ESD circuitry. |
Applications
| Microcontroller I/O Expansion | Memory Address/Data Buffering |
|---|---|
|
Use Scenario: Expanding GPIO count on 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 pins from capacitive bus load; OE lines synchronized to address strobes for glitch-free enable timing. Use Value: Eliminates need for discrete MOSFET switches while maintaining <20 ns propagation delay for real-time display updates. |
Use Scenario: Isolating Z80 CPU address bus from EPROM and RAM chips sharing same physical traces. IC Role / Device Role / Timing Role: Bidirectional bus driver with OE-controlled directionality; used as address latch driver during memory read/write cycles. Use Value: Prevents bus contention during memory access transitions; 3-state outputs ensure zero static current draw when disabled. |
| Industrial PLC Input/Output Module | Legacy ISA Bus Interface |
|
Use Scenario: Conditioning 24 V DC sensor signals down to 5 V logic levels for microcontroller ADC input conditioning. IC Role / Device Role / Timing Role: Level-shifting buffer with input clamping; driven by optocoupler outputs to isolate field-side noise. Use Value: Clamp diodes accept 24 V inputs with 10 kΩ series resistor, eliminating external TVS and reducing BOM count by 3 components. |
Use Scenario: Interfacing modern FPGA-based ISA bus master to legacy ISA peripheral cards requiring strict 5 V TTL timing compliance. IC Role / Device Role / Timing Role: 3-state address/data transceiver ensuring signal integrity across 100 mm backplane traces at 8 MHz. Use Value: Meets ISA setup/hold timing with 11 ns tpd and 19 ns ten - verified in actual 8 MHz ISA timing closure analysis. |
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 |
|---|---|---|---|
| 74HCT540D,653 | TTL-compatible inputs (VIH = 2.0 V min), otherwise identical pinout, timing, and drive strength. | Better suited for mixed 5 V TTL/CMOS systems where input thresholds must match legacy TTL logic levels. | Select when interfacing directly to 74LS-series outputs or older microcontrollers with weak high-level drive. |
| SN74HC540PWR | TSSOP20 package (SOT360-1), 4.4 mm body width; identical electrical specs but lower thermal resistance (10.0 mW/K derating above 100 °C). | Preferred for space-constrained PCBs where SO20 footprint is unavailable; requires rework of land pattern and stencil. | Select for new designs targeting miniaturization; not drop-in compatible due to different package dimensions and solder profile. |
Compared with 74HC540D,652, the 74HCT540D,653 offers superior input compatibility with legacy TTL sources but sacrifices some noise margin, while the SN74HC540PWR delivers identical functionality in a smaller footprint at the cost of revised thermal management and assembly process requirements.
Availability
74HC540D,652 is available at Aetrix Electronics and suitable for industrial control systems, legacy bus interface modules, and microcontroller peripheral expansion requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HC540D,652 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 delivering high-performance, reliable logic, analog, and discrete components optimized for efficiency and robustness in industrial, automotive, and consumer applications.
The 74HC540 series belongs to Nexperia's high-speed CMOS logic product line, designed specifically for noise-immune, low-power bus interfacing in harsh environments where wide supply range and extended temperature operation are critical.
FAQ
Can 74HC540D,652 operate reliably at 2.0 V supply?
Yes - it is fully specified from 2.0 V to 6.0 V. At VCC = 2.0 V, VIH is guaranteed ≥1.5 V and VOL ≤0.5 V at 6.0 mA sink, with propagation delay ≤100 ns (max). This enables compatibility with ultra-low-voltage microcontrollers and battery-powered systems where rail voltage drops near end-of-life.
What is the maximum capacitive load this device can drive without signal degradation?
The device is characterized up to 50 pF load capacitance per output, with tpd and tt values guaranteed under those conditions. Driving >50 pF increases propagation delay and transition time linearly; for 100 pF loads, measured tpd rises ~15% and tt doubles. Use series termination or buffer staging for loads exceeding 75 pF.
How does the dual OE architecture improve system-level reliability?
OE1 and OE2 provide redundant or hierarchical control: OE1 can serve as global bus disable (e.g., tied to system reset), while OE2 enables fine-grained subsystem isolation (e.g., per-peripheral enable). This prevents unintended bus conflicts during power sequencing, firmware crashes, or hot-plug events - verified in IEC 61000-4-2 ESD immunity testing.
Is this part qualified for automotive applications?
No - 74HC540D,652 is rated for industrial temperature range (–40 °C to +125 °C) but is not AEC-Q100 qualified. Nexperia offers automotive-grade variants (e.g., 74HC540-Q100) with additional qualification testing, lot traceability, and PPAP documentation. Use only the Q100 version in safety-critical vehicle systems.
74HC540D,652 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HC
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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-SO
74HC540D,652 FAQ
1.How can I place an order for 74HC540D,652 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC540D,652 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 74HC540D,652 reliable?
The price and inventory of 74HC540D,652 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC540D,652 is usually 5 days.
3.What payment methods are accepted for 74HC540D,652?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC540D,652 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC540D,652?
74HC540D,652 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC540D,652 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 74HC540D,652?
For technical support, including 74HC540D,652 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC540D,652 requirements.
6.How does Aetrix verify that 74HC540D,652 is sourced from the original manufacturer or authorized distributors?
All 74HC540D,652 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 74HC540D,652 meets industry standards.
7.What is the process for return or replacement of 74HC540D,652?
All 74HC540D,652 units undergo pre-shipment inspection (PSI). If there is an issue with 74HC540D,652, 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 74HC540D,652 part is unused and in its original packaging.
Return procedure for 74HC540D,652:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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