My Inquiry
My Account
NXP Semiconductors 74HCT240N,652
- Part No.:
- 74HCT240N,652
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
74HCT240N,652.pdf
- Description:
- IC BUFFER INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,400
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
74HCT240N,652 from NXP Semiconductors is a dual octal inverting 3-state buffer/line driver in a 20-lead DIP package, operating from 4.5 V to 5.5 V supply, with propagation delay of 9 ns (typ) at 5 V/15 pF, ±6 mA output drive, and −40 °C to +125 °C temperature range. It serves as bidirectional bus interface logic in industrial control backplanes and legacy TTL-compatible system expansion slots.
For engineers reviewing the 74HCT240N,652 datasheet, 74HCT240N,652 pinout, 74HCT240N,652 application, or 74HCT240N,652 equivalent, this page delivers verified electrical specs, functional pin mapping, real-world use cases, and validated alternative parts for immediate design-in decisions.
Technical Context
The 74HCT240N,652 implements two independent 4-bit inverting buffers, each controlled by its own active-low 3-state enable input (1OE, 2OE). Outputs enter high-impedance OFF-state when the corresponding OE is HIGH, enabling shared-bus contention management without external pull-ups.
It uses silicon-gate CMOS technology compatible with LSTTL input thresholds (VIH = 2.0 V min, VIL = 0.8 V max), ensuring direct replacement in 5 V TTL systems while delivering lower power consumption and higher noise immunity than bipolar equivalents.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - matches standard 5 V TTL rail; avoids level-shifting in mixed-logic systems |
| Propagation Delay | 9 ns (typ) at VCC = 5.0 V, CL = 15 pF - supports >30 MHz bus toggle rates in synchronous interfaces |
| Output Drive | ±6 mA (VOH/VOL) - sufficient to drive 10 LSTTL loads or 15 pF PCB traces without buffering |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - ensures reliable recognition of TTL logic levels |
| Operating Temperature | −40 °C to +125 °C - qualified for under-hood automotive ECUs and industrial motor drives |
| ESD Protection | HBM >2000 V, MM >200 V - meets IEC 61000-4-2 Level 2 for board-level robustness |
| Power Dissipation | CPD = 30 pF - enables accurate dynamic power estimation in high-frequency data paths |
Pinout & Package
74HCT240N,652 is housed in a plastic dual in-line package (DIP20, SOT146-1), 300 mil width, 20 leads, through-hole mountable with 2.54 mm pitch. Pin 1 marked by notch or dot; body dimensions 26.92 × 6.40 × 3.60 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low enable inputs - assert LOW to activate respective 4-bit inverting buffer group |
| 2, 4, 6, 8, 11–18 | 1A0–1A3, 2A0–2A3 | Data inputs - inverted and driven to outputs only when corresponding OE is LOW |
| 3, 5, 7, 9, 12–16 | 2Y0–2Y3, 1Y0–1Y3 | Inverted bus outputs - present complement of input when enabled; high-Z when disabled |
| 10, 20 | GND, VCC | Ground and 5 V supply - decoupling capacitor required within 10 mm of pin 20 for noise suppression |
Key Features
| Feature | Design Value |
|---|---|
| Inverting 3-state outputs | Enables bidirectional bus arbitration without external direction control logic or transceivers |
| LSTTL-compatible input thresholds | Eliminates need for level translators when interfacing with legacy 5 V microcontrollers or FPGAs |
| −40 °C to +125 °C operation | Supports deployment in engine control units, power inverters, and outdoor telecom infrastructure |
| JEDEC Std 7A compliance | Guarantees mechanical and thermal interoperability with standard DIP sockets and wave-solder processes |
| Low static current (ICC ≤ 160 µA) | Reduces standby power in always-on industrial monitoring nodes and battery-backed systems |
Applications
| Industrial PLC Backplane Interface | Legacy Microcontroller Bus Expansion |
|---|---|
Use Scenario: Isolating and driving address/data lines between CPU module and I/O carrier card in modular programmable logic controllers. IC Role / Device Role / Timing Role: Dual octal inverting buffer provides level translation, fanout amplification, and bus contention control on shared 8-bit parallel bus. Use Value: Enables hot-swappable I/O modules via 3-state isolation; 9 ns delay preserves timing margins in 20 MHz bus cycles. | Use Scenario: Extending GPIO count of 8051 or Z80-based embedded controllers using ISA-style peripheral cards. IC Role / Device Role / Timing Role: Inverting line driver translates microcontroller outputs to TTL-compatible signals while enabling/disabling peripheral access via OE control. Use Value: Maintains full LSTTL drive strength across 20 cm PCB traces; eliminates need for discrete transistor arrays. |
| Automotive Body Control Module | Test Equipment Signal Conditioning |
Use Scenario: Buffering sensor input multiplexer outputs and actuator command lines in vehicle door control units. IC Role / Device Role / Timing Role: 3-state inverting buffer isolates diagnostic scan tools from main ECU during reprogramming sequences. Use Value: −40 °C to +125 °C rating ensures reliability near HVAC ducts; HBM >2 kV withstands assembly ESD events. | Use Scenario: Driving calibrated reference signals into DUT inputs during automated functional test of digital ICs. IC Role / Device Role / Timing Role: Precision inverting buffer provides matched rise/fall times (5 ns typ) and low skew between parallel test channels. Use Value: 30 pF CPD allows accurate dynamic power modeling; tight propagation delay spec ensures test vector timing integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT240D,652 | SO20 package (7.5 mm width); same electrical specs; 8 mW/K thermal derating above 70 °C | Suitable for surface-mount production; requires reflow profile adjustment vs. through-hole DIP | Select when board space is constrained and automated assembly is used. |
| SN74HCT240N | Identical function and pinout; TI-manufactured; VIH/VIL tolerances tighter (VIH = 2.0 V min, VIL = 0.8 V max same), but ICC max 80 µA (25 °C) vs. NXP's 160 µA (125 °C) | Validated in TI-specific qualification flow; identical drop-in use in 5 V logic systems | Choose for TI-design ecosystems or when sourcing diversity is required. |
Compared with 74HCT240N,652, the SO20 variant saves PCB area but demands thermal management above 70 °C, while the TI SN74HCT240N offers identical functionality with marginally lower room-temperature supply current but same high-temp performance envelope.
Availability
74HCT240N,652 is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, legacy microcontroller bus expansion, and test equipment signal conditioning requiring stable component supply across extended temperature ranges.
Supply support for 74HCT240N,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
NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The 74HCT240N,652 belongs to NXP's legacy HC/HCT logic family, designed specifically to provide pin- and function-compatible CMOS replacements for obsolete TTL devices in cost-sensitive, high-reliability 5 V systems.
FAQ
What is the maximum clock frequency supported by the 74HCT240N,652?
The 74HCT240N,652 does not operate as a clocked device but as a combinatorial buffer. Its 9 ns typical propagation delay at 5 V/15 pF supports reliable data toggling up to approximately 30 MHz on parallel buses. System-level timing depends on load capacitance and trace routing; actual maximum frequency must be verified per layout using worst-case tpd (30 ns at 125 °C).
Can the 74HCT240N,652 drive LED displays directly?
No, the 74HCT240N,652 is not intended for direct LED driving. Its ±6 mA output current is insufficient for typical LED segments (requiring 10–20 mA). Use it only for logic-level signal conditioning; pair with dedicated LED drivers like ULN2003 or constant-current sink ICs for display applications.
Is the 74HCT240N,652 pin-compatible with the 74HC240N?
Yes, the 74HCT240N,652 is pin-compatible with the 74HC240N, sharing identical pinout and package (DIP20). However, the 74HC240N operates from 2.0–6.0 V and has CMOS-input thresholds, whereas the 74HCT240N,652 uses TTL-compatible inputs (2.0 V VIH) optimized for 5 V systems - substitution requires verifying input voltage compatibility.
What is the recommended decoupling for the 74HCT240N,652?
A 100 nF ceramic capacitor placed within 10 mm of pin 20 (VCC) and pin 10 (GND) is mandatory. For systems with multiple 74HCT240N,652 devices, add one 4.7 µF tantalum or aluminum electrolytic capacitor per 5–10 ICs on the same 5 V rail to suppress low-frequency ripple and transient droop.
Does the 74HCT240N,652 support hot-swap insertion?
The 74HCT240N,652 supports hot-swap only when powered and enabled before connection - its 3-state outputs prevent bus contention during insertion. However, it lacks built-in hot-swap protection circuitry (e.g., slew-rate limiting, current limiting). External series resistors (22–47 Ω) on outputs are recommended to limit inrush current during live insertion into loaded buses.
74HCT240N,652 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HCT
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- Through Hole
- Supplier Device Package:
- 20-DIP
74HCT240N,652 FAQ
1.How can I place an order for 74HCT240N,652 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT240N,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 74HCT240N,652 reliable?
The price and inventory of 74HCT240N,652 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT240N,652 is usually 5 days.
3.What payment methods are accepted for 74HCT240N,652?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT240N,652 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT240N,652?
74HCT240N,652 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT240N,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 74HCT240N,652?
For technical support, including 74HCT240N,652 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT240N,652 requirements.
6.How does Aetrix verify that 74HCT240N,652 is sourced from the original manufacturer or authorized distributors?
All 74HCT240N,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 74HCT240N,652 meets industry standards.
7.What is the process for return or replacement of 74HCT240N,652?
All 74HCT240N,652 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT240N,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 74HCT240N,652 part is unused and in its original packaging.
Return procedure for 74HCT240N,652:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74HCT240N,652 Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
