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NXP Semiconductors 74HC240D,652
- Part No.:
- 74HC240D,652
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74HC240D,652.pdf
- Description:
- IC BUFFER INVERT 6V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:7,706
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Product details
Overview
74HC240D,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, with dual independent output enables (1OE, 2OE), ±35 mA output drive, and -40 °C to +125 °C temperature rating. It serves as bidirectional bus interface or address/data line isolation in industrial control backplanes.
For engineers reviewing the 74HC240D,652 datasheet, 74HC240D,652 pinout, 74HC240D,652 application, or 74HC240D,652 equivalent, this page delivers verified functional behavior, SO20 pin mapping, propagation delay (9–30 ns at VCC = 4.5–6.0 V), output enable timing, and direct substitution guidance for logic-level translation and bus contention management.
Technical Context
The 74HC240D,652 implements two independent 4-bit inverting buffer sections, each controlled by a dedicated active-low output enable (1OE for Y0–Y3, 2OE for Y4–Y7). Its CMOS architecture ensures low static current (≤160 μA at 6.0 V, -40 °C to +125 °C) and high noise immunity (≥40 % of VCC).
All inputs feature clamp diodes enabling safe interfacing to voltages exceeding VCC via external current-limiting resistors. The device supports TTL-level input compatibility only in the 74HCT240 variant; the 74HC240D,652 uses CMOS-level inputs with VIH ≥ 3.15 V (VCC = 4.5 V) and VIL ≤ 1.35 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0 V to 6.0 V - Enables interoperability across 3.3 V and 5 V logic domains without level shifters. |
| Propagation Delay (tpd) | 9 ns (typ, VCC = 6.0 V, CL = 15 pF) - Supports >30 MHz bus toggle rates in buffered data paths. |
| Output Drive Current | ±35 mA (IO) - Sufficient to directly drive 50 Ω transmission lines or multiple 74-series inputs (fan-out ≥ 10). |
| Enable/Disable Time (ten/tdis) | 11–38 ns (VCC = 4.5–6.0 V) - Ensures clean bus arbitration with minimal glitch window during state transitions. |
| Input Clamp Diodes | Integrated - Allows safe connection of inputs to voltages up to VCC + 0.5 V using series resistors, simplifying mixed-voltage interface design. |
| Operating Temperature | -40 °C to +125 °C - Qualified for under-hood automotive modules, industrial PLCs, and extended-range power supplies. |
| ESD Protection | HBM > 2000 V, CDM > 1000 V - Reduces need for external ESD protection in board-level I/O zones. |
Pinout & Package
74HC240D,652 is housed in a plastic small outline package (SO20, SOT163-1) with 20 leads, 7.5 mm body width, and standard 1.27 mm lead pitch. Pin 1 is marked by a notch or beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output enable inputs - Independently disable Group 1 (Y0–Y3) or Group 2 (Y4–Y7) to high-impedance state. |
| 2, 4, 6, 8 | 1A0–1A3 | Inverting input group A - Logic inversion applied before driving outputs Y0–Y3. |
| 3, 5, 7, 9 | 2Y0–2Y3 | Group 2 inverting outputs - Driven by inputs 2A0–2A3 (pins 17, 15, 13, 11) when 2OE is LOW. |
| 10 | GND | Ground reference - Must be connected to system 0 V plane; decoupling capacitor recommended adjacent to pin. |
| 11, 13, 15, 17 | 2A0–2A3 | Inverting input group B - Inverts and drives outputs 2Y0–2Y3 (pins 3, 5, 7, 9). |
| 12, 14, 16, 18 | 1Y0–1Y3 | Group 1 inverting outputs - Driven by inputs 1A0–1A3 (pins 2, 4, 6, 8) when 1OE is LOW. |
| 20 | VCC | Positive supply - Requires local 100 nF ceramic decoupling between VCC and GND (pin 10). |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 3-state control | Separate 1OE and 2OE pins allow selective isolation of two 4-bit data lanes-critical for multiplexed address/data buses. |
| CMOS-level input thresholds | VIH = 3.15 V (min, VCC = 4.5 V); VIL = 1.35 V (max) - Ensures robust noise margin (>1.3 V) in 5 V systems. |
| Input clamp diode integration | Enables overvoltage-tolerant input design (e.g., 12 V sensor signals into 5 V logic) using only series resistors-no external diodes required. |
| High-temperature operation | Specified from -40 °C to +125 °C - Validated for use in engine control units, motor drives, and industrial enclosures without derating. |
| Low dynamic power dissipation | CPD = 30 pF per buffer - Limits switching power to <1.5 mW per channel at 10 MHz (VCC = 5 V), reducing thermal load in dense layouts. |
Applications
| Industrial PLC Backplane Interface | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Isolating microcontroller GPIOs from noisy 24 V I/O expansion cards in modular PLC racks. IC Role / Device Role / Timing Role: Inverting 3-state buffer providing direction-controlled signal routing and bus contention prevention during hot-swap events. Use Value: Dual OE pins enable synchronized enable/disable of input groups during firmware reconfiguration, eliminating bus glitches during module insertion/removal. |
Use Scenario: Driving LIN bus transceiver enable lines and LED indicators from a 3.3 V MCU in a 12 V vehicle electrical environment. IC Role / Device Role / Timing Role: Level-shifting buffer with integrated input clamping, translating 3.3 V logic to 5 V-compatible outputs while tolerating load-dump transients. Use Value: Input clamp diodes permit direct connection to 12 V pull-ups via 10 kΩ resistors-eliminating discrete protection components and saving PCB area. |
| Test Equipment Signal Multiplexer | Legacy System Bus Extender |
|
Use Scenario: Routing multiple DUT test signals through a shared analog/digital acquisition path in automated test equipment. IC Role / Device Role / Timing Role: Bidirectional bus isolator with sub-40 ns enable/disable timing, ensuring precise signal gating without crosstalk. Use Value: 9 ns propagation delay and 11 ns enable time support 100+ MHz sampling clock distribution with deterministic skew control. |
Use Scenario: Interfacing modern FPGA I/O banks (3.3 V LVTTL) to legacy ISA-bus peripherals requiring 5 V tolerant inputs and outputs. IC Role / Device Role / Timing Role: Voltage-level translator and bus driver with 5 V supply, supporting both input overvoltage tolerance and 5 V output swing. Use Value: CMOS input thresholds and ±35 mA drive capability meet ISA bus loading requirements (2.6 mA per load) with 10× margin. |
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 |
|---|---|---|---|
| 74HCT240D,652 | TTL-compatible inputs (VIH = 2.0 V min); identical SO20 package and pinout. | Better suited for mixed 5 V TTL/CMOS systems where input noise margins are constrained. | Select when interfacing legacy TTL logic or when input VIH must be ≤2.0 V at VCC = 5 V. |
| SN74HC240N | PDIP-20 package (0.3" width); same electrical specs but through-hole mounting and higher parasitic inductance. | Preferred for prototyping, repair, or legacy through-hole PCBs; not suitable for high-speed or space-constrained designs. | Choose only for hand-soldered evaluation or replacement in existing DIP-based systems. |
Compared with 74HC240D,652, the 74HCT240D,652 offers lower input threshold compatibility at the cost of reduced noise immunity, while SN74HC240N trades surface-mount performance for mechanical serviceability-neither provides improved speed or drive strength.
Availability
74HC240D,652 is available at Aetrix Electronics and suitable for industrial automation backplanes, automotive body electronics, automated test equipment, and legacy bus extension requiring stable component supply across extended temperature ranges.
Supply support for 74HC240D,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 logic, discrete, and MOSFET solutions optimized for efficiency, reliability, and miniaturization in industrial, automotive, and consumer applications.
The 74HC240D,652 belongs to Nexperia's 74HC logic family-designed for low-power, high-noise-immunity digital interfacing in systems demanding wide voltage operation and extended temperature resilience.
FAQ
Can 74HC240D,652 operate reliably at 3.3 V supply?
Yes. The 74HC240D,652 is fully specified from 2.0 V to 6.0 V, including 3.3 V operation. At VCC = 3.3 V, propagation delay is ≤25 ns (typ), VOH ≥ 2.9 V (IO = -6 mA), and VOL ≤ 0.33 V (IO = 6 mA), meeting standard 3.3 V LVTTL interface requirements with margin.
What is the maximum capacitive load the outputs can drive?
The outputs are characterized up to 15 pF (per Table 7), but can reliably drive ≥50 pF loads with acceptable timing degradation. At CL = 50 pF and VCC = 5 V, tpd increases to ~30 ns and tt extends to ~15 ns-still within most synchronous bus timing budgets.
Is there a non-inverting version of this device in the same package?
Yes-the 74HC244D,652 is the functional complement: octal non-inverting 3-state buffer in identical SO20 (SOT163-1) package, with matching pinout except for inverted logic function and same dual-OE architecture.
Does 74HC240D,652 require external pull-up resistors on OE pins?
No. OE pins are active-low CMOS inputs with leakage <±1.0 μA. When driven directly by MCU GPIOs or logic gates, no pull-ups are needed. If left unconnected, OE floats HIGH (outputs disabled), but best practice is to tie unused OE pins to VCC via 10 kΩ resistor for deterministic state.
74HC240D,652 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HC
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- 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
74HC240D,652 FAQ
1.How can I place an order for 74HC240D,652 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC240D,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 74HC240D,652 reliable?
The price and inventory of 74HC240D,652 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC240D,652 is usually 5 days.
3.What payment methods are accepted for 74HC240D,652?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC240D,652 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC240D,652?
74HC240D,652 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC240D,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 74HC240D,652?
For technical support, including 74HC240D,652 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC240D,652 requirements.
6.How does Aetrix verify that 74HC240D,652 is sourced from the original manufacturer or authorized distributors?
All 74HC240D,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 74HC240D,652 meets industry standards.
7.What is the process for return or replacement of 74HC240D,652?
All 74HC240D,652 units undergo pre-shipment inspection (PSI). If there is an issue with 74HC240D,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 74HC240D,652 part is unused and in its original packaging.
Return procedure for 74HC240D,652:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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