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NXP Semiconductors 74HCT240D,652
- Part No.:
- 74HCT240D,652
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74HCT240D,652.pdf
- Description:
- IC BUFFER INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:28,750
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Product details
Overview
74HCT240D,652 from Nexperia is an octal inverting 3-state buffer/line driver with dual output enables (1OE, 2OE), operating from 4.5 V to 5.5 V supply, delivering 6 mA output drive at VCC = 4.5 V, and specified for -40 °C to +125 °C industrial temperature range. It functions as two independent 4-bit buffers or one 8-bit buffer in bus interface, address/data latching, and memory I/O applications.
For engineers reviewing the 74HCT240D,652 datasheet, 74HCT240D,652 pinout, 74HCT240D,652 application, or 74HCT240D,652 equivalent, key selection criteria include TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max), propagation delay of 9 ns (typ) at 5 V/15 pF, 3-state enable/disable timing (ten = 13 ns, tdis = 13 ns), and SO20 (SOT163-1) package compatibility with legacy 74-series footprint requirements.
Technical Context
The 74HCT240D,652 implements dual independent 4-bit inverting buffer sections, each controlled by a dedicated active-low output enable (1OE for Y0–Y3, 2OE for Y4–Y7). Its TTL-level inputs ensure direct compatibility with legacy 5 V logic families without level-shifting circuitry.
Each output supports high-impedance tri-state operation with fast enable/disable transitions (13 ns typ), low static current (ICC ≤ 8 μA at 25 °C), and robust ESD protection (HBM > 2000 V, CDM > 1000 V), enabling reliable use in noise-prone industrial control backplanes and modular I/O systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures stable operation across standard 5 V ±5% rails without regulation overhead. |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - Guarantees interoperability with TTL, LSTTL, and 5 V CMOS outputs. |
| Output Drive | ±6 mA at VCC = 4.5 V - Sufficient to drive 10 LSTTL loads or 15 pF capacitive bus lines directly. |
| Propagation Delay | 9 ns (typ) at VCC = 5.0 V, CL = 15 pF - Enables reliable 50 MHz bus operation with margin for setup/hold timing. |
| Enable/Disable Time | ten = 13 ns, tdis = 13 ns (typ) - Supports rapid bus arbitration and dynamic channel switching in multiplexed systems. |
| Operating Temperature | -40 °C to +125 °C - Qualified for under-hood automotive modules, industrial PLCs, and power supply control circuits. |
| ESD Protection | HBM > 2000 V, CDM > 1000 V - Reduces need for external transient suppression in board-level ESD zones. |
Pinout & Package
74HCT240D,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 - compatible with automated SMT placement and reflow profiles per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output enables - Independently disable Group A (pins 12–18) or Group B (pins 3–9) outputs to isolate bus segments. |
| 2, 4, 6, 8 | 1A0–1A3 | Inverting input group A - Drives corresponding Y outputs with logical inversion (e.g., 1A0 → 1Y0 = NOT 1A0). |
| 11, 13, 15, 17 | 2A0–2A3 | Inverting input group B - Independent second set of four inputs feeding outputs 2Y0–2Y3. |
| 12, 14, 16, 18 | 1Y0–1Y3 | Inverting 3-state outputs group A - High-impedance when 1OE = HIGH; otherwise inverted copy of 1A0–1A3. |
| 3, 5, 7, 9 | 2Y0–2Y3 | Inverting 3-state outputs group B - Controlled by 2OE; provides isolated second 4-bit buffered path. |
| 10 | GND | Ground reference - Must be connected to system 0 V plane; decoupling capacitor required within 5 mm. |
| 20 | VCC | Positive supply - Requires local 100 nF ceramic decoupling between pins 10 and 20 per JEDEC guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | Accepts standard 5 V TTL logic levels without external biasing or level translation. |
| Dual independent 3-state controls | Enables selective isolation of two 4-bit data paths on shared bus infrastructure. |
| Low quiescent current | ICC ≤ 8 μA at 25 °C - Minimizes standby power in always-on industrial monitoring nodes. |
| High noise immunity | Typical noise margin > 0.8 V at VCC = 5 V - Resists coupling from adjacent motor drivers or switching regulators. |
| Industrial temperature grade | Rated from -40 °C to +125 °C - Validated for extended life in sealed enclosures without forced cooling. |
Applications
| Industrial PLC Backplane Interface | Legacy Microcontroller Address Bus Expansion |
|---|---|
|
Use Scenario: Isolating and buffering 8-bit address lines between a microcontroller and multiple peripheral ICs on a DIN-rail mounted PLC backplane. IC Role / Device Role / Timing Role: Inverting 3-state buffer providing bidirectional address isolation with precise enable timing to prevent bus contention during peripheral selection. Use Value: Enables deterministic 50 ns address setup/hold margins using 13 ns enable/disable times and 9 ns propagation delay, eliminating race conditions during multi-peripheral access. |
Use Scenario: Expanding limited GPIO count of an 8-bit MCU to drive external SRAM and EEPROM chips sharing a common data/address bus. IC Role / Device Role / Timing Role: Octal inverting line driver translating MCU port pins into robust bus signals while supporting 3-state tristate for memory read/write direction control. Use Value: Delivers ±6 mA drive strength per output to meet LSTTL fanout requirements of legacy memory devices without external transistors or pull-ups. |
| Automotive Body Control Module I/O Multiplexing | Test Equipment Digital Pattern Generator Output Stage |
|
Use Scenario: Driving multiple solenoid control lines from a single microcontroller in a BCM, where ESD robustness and wide temperature operation are critical. IC Role / Device Role / Timing Role: Level-shifting and current-boosting buffer with HBM > 2000 V ESD rating, enabling direct connection to unshielded harness connectors. Use Value: Eliminates need for discrete TVS diodes and series resistors due to integrated clamp diodes and 125 °C qualification, reducing BOM count and PCB area. |
Use Scenario: Generating synchronized digital stimulus waveforms for DUT testing, requiring precise edge timing and bus contention avoidance. IC Role / Device Role / Timing Role: Precision 3-state waveform driver with matched propagation delays (<1 ns skew between channels) and sub-15 ns enable control. Use Value: Achieves <1 ns inter-channel skew across all eight outputs, ensuring simultaneous signal assertion critical for parallel bus functional test vectors. |
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 |
|---|---|---|---|
| 74HCT240PW,118 | TSSOP20 (SOT360-1) package: 4.4 mm width, 0.65 mm pitch - 30 % smaller footprint than SO20. | Higher thermal resistance (100 °C/W vs 85 °C/W) limits continuous 6 mA drive in compact enclosures. | Select for space-constrained designs where PCB real estate is prioritized over maximum sustained output current. |
| SN74HCT240N | PDIP20 package: through-hole mounting, no thermal pad, higher parasitic capacitance (~5 pF extra per pin). | Slower propagation delay (12 ns typ) and lower ESD rating (HBM = 2000 V but no CDM spec) limit use in high-speed or harsh ESD environments. | Select only for prototyping or legacy through-hole assembly; avoid for production-grade industrial or automotive systems. |
Compared with 74HCT240PW,118 and SN74HCT240N, the 74HCT240D,652 offers optimal balance of industrial temperature rating, SO20 mechanical compatibility with existing 74-series layouts, and verified 13 ns enable timing - making it the preferred choice for volume-manufactured embedded controllers requiring long-term supply stability and drop-in replacement capability.
Availability
74HCT240D,652 is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, and test equipment digital I/O requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for 74HCT240D,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 specializing in high-performance logic, analog, and discrete components, with manufacturing rooted in process technology leadership and automotive-grade quality systems.
The 74HCT240D,652 belongs to Nexperia's 74HCT logic family, engineered for TTL-compatible interfacing in industrial and automotive control systems where reliability, noise immunity, and wide temperature operation are mandatory.
FAQ
What is the maximum clock frequency supported by the 74HCT240D,652?
The 74HCT240D,652 is not a clocked device and has no internal clock; it operates asynchronously. Its 9 ns typical propagation delay at 5 V/15 pF supports reliable data transfer up to 50 MHz on properly terminated buses, assuming adequate setup/hold margins and controlled trace impedance.
Can 74HCT240D,652 drive LEDs directly?
No - its outputs are designed for logic-level bus driving, not LED current sourcing/sinking. The absolute maximum output current is ±35 mA per pin, but recommended DC drive is ±6 mA. Direct LED connection risks exceeding safe operating area and degrading timing performance due to capacitive loading.
Is the 74HCT240D,652 pin-compatible with the 74HC240D?
Yes - both share identical SO20 pinout, logic function, and 3-state behavior. However, 74HC240D uses CMOS input thresholds (VIH = 3.15 V min at 4.5 V), while 74HCT240D uses TTL thresholds (VIH = 2.0 V min), making the latter compatible with older 5 V TTL sources without level shifters.
Does the 74HCT240D,652 require external pull-up or pull-down resistors on its inputs?
No - inputs have built-in clamp diodes and defined VIH/VIL thresholds. External resistors are unnecessary unless used for specific fail-safe states (e.g., pulling OE low during power-up); unused inputs should be tied to VCC or GND to prevent floating-induced noise sensitivity.
74HCT240D,652 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HCT
- 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:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
74HCT240D,652 FAQ
1.How can I place an order for 74HCT240D,652 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT240D,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 74HCT240D,652 reliable?
The price and inventory of 74HCT240D,652 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT240D,652 is usually 5 days.
3.What payment methods are accepted for 74HCT240D,652?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT240D,652 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT240D,652?
74HCT240D,652 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT240D,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 74HCT240D,652?
For technical support, including 74HCT240D,652 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT240D,652 requirements.
6.How does Aetrix verify that 74HCT240D,652 is sourced from the original manufacturer or authorized distributors?
All 74HCT240D,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 74HCT240D,652 meets industry standards.
7.What is the process for return or replacement of 74HCT240D,652?
All 74HCT240D,652 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT240D,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 74HCT240D,652 part is unused and in its original packaging.
Return procedure for 74HCT240D,652:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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