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Nexperia USA Inc. 74HC240D,653
- Part No.:
- 74HC240D,653
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74HC240D,653.pdf
- Description:
- IC BUFFER INVERT 6V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:8,407
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Product details
Overview
74HC240D,653 from Nexperia is an octal inverting 3-state buffer/line driver in SO20 package, operating from 2.0 V to 6.0 V supply, delivering 7.8 mA sink/source drive at 4.5 V, with propagation delay as low as 9 ns (VCC = 5.0 V, CL = 15 pF), used for bidirectional bus isolation and address/data buffering in industrial control logic systems.
For engineers reviewing the 74HC240D,653 datasheet, 74HC240D,653 pinout, 74HC240D,653 application, or 74HC240D,653 equivalent, this page delivers verified electrical parameters, SO20 pin mapping, functional partitioning (dual 4-bit groups), thermal derating data, and direct substitution guidance - all extracted from Nexperia's Rev. 7 (5 August 2024) product data sheet.
Technical Context
This device implements two independent 4-bit inverting buffer sections, each controlled by a dedicated active-low output enable (1OE, 2OE), enabling selective bus driving without contention. Each section features CMOS-level inputs and rail-to-rail 3-state outputs with input clamp diodes supporting overvoltage-tolerant interfacing via current-limiting resistors.
It operates across -40 °C to +125 °C, complies with JEDEC JESD7A (2.0–6.0 V) and JESD8C (2.7–3.6 V), and achieves ±20 mA clamping current protection on inputs/outputs. Static VIH/VIL thresholds scale with VCC for 74HC240, ensuring robust noise immunity up to 40% of VCC.
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 logic rails. |
| Output Drive Strength | ±7.8 mA at VCC = 4.5 V - sufficient to drive 15 pF loads with <30 ns propagation delay in standard TTL/CMOS buses. |
| Propagation Delay | 9 ns typical (VCC = 5.0 V, CL = 15 pF) - enables reliable operation in 50 MHz synchronous bus environments. |
| Enable/Disable Time | 13 ns typical enable (ten), 13 ns typical disable (tdis) at VCC = 4.5 V - ensures fast bus turnaround for time-critical arbitration. |
| Input Clamp Current | ±20 mA - allows safe interface to signals exceeding VCC using external series resistors (e.g., 3.3 V logic driving 5 V bus). |
| Operating Temperature | -40 °C to +125 °C - qualified for under-hood industrial and extended-temperature embedded applications. |
| Power Dissipation | 500 mW max (SO20), derates 12.3 mW/K above 109 °C - defines thermal limits for sustained high-speed switching in enclosed enclosures. |
Pinout & Package
74HC240D,653 uses the SOT163-1 (SO20) plastic small outline package: 20-pin, 7.5 mm body width, 1.27 mm pitch, gull-wing leads, JEDEC MS-013 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output enable inputs - independently disable Group 1 (pins 12,14,16,18) or Group 2 (pins 3,5,7,9). |
| 2,4,6,8 | 1A0–1A3 | Inverting input group 1 - drives outputs 1Y0–1Y3 (pins 18,16,14,12) when 1OE = LOW. |
| 11,13,15,17 | 2A0–2A3 | Inverting input group 2 - drives outputs 2Y0–2Y3 (pins 3,5,7,9) when 2OE = LOW. |
| 12,14,16,18 | 1Y0–1Y3 | Inverting 3-state outputs for group 1 - HIGH-impedance when 1OE = HIGH; inverted copy of 1A0–1A3 otherwise. |
| 3,5,7,9 | 2Y0–2Y3 | Inverting 3-state outputs for group 2 - HIGH-impedance when 2OE = HIGH; inverted copy of 2A0–2A3 otherwise. |
| 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. |
Key Features
| Feature | Design Value |
|---|---|
| Wide supply range | 2.0 V to 6.0 V operation - eliminates need for level shifters when interfacing 3.3 V microcontrollers to 5 V peripherals. |
| Input clamp diodes | Integrated ESD protection diodes on all inputs - enables safe connection to voltages up to VCC + 0.5 V using external current-limiting resistors. |
| Latch-up immunity | Exceeds 100 mA per JESD78 Class II Level B - prevents destructive latch-up during transient overvoltage events in noisy industrial environments. |
| Low dynamic power | 30 pF CPD per buffer - limits switching power to <1.5 mW per channel at 10 MHz, critical for thermally constrained PCB layouts. |
| High noise margin | VIH ≥ 70% VCC, VIL ≤ 30% VCC at VCC = 4.5 V - provides >1.35 V DC noise immunity, rejecting common-mode transients on shared PCB traces. |
Applications
| Industrial PLC Backplane | Legacy ISA Bus Interface |
|---|---|
|
Use Scenario: Isolating CPU address/data lines from expansion slot peripherals in programmable logic controllers. IC Role / Device Role / Timing Role: Inverting 3-state buffer providing direction-controlled bus separation with sub-30 ns propagation to meet ISA timing budgets. Use Value: Enables hot-swap-safe peripheral insertion by disabling outputs during slot reset, preventing bus contention and signal corruption. |
Use Scenario: Level-shifting and buffering between 5 V ISA bus and modern low-voltage FPGA-based I/O controllers. IC Role / Device Role / Timing Role: Dual-group inverting driver allowing independent enable control of address (Group 1) and data (Group 2) lanes. Use Value: Eliminates need for discrete level translators while maintaining full 8-bit throughput and meeting ISA tAS/tDS setup/hold requirements. |
| Automated Test Equipment (ATE) | Motor Control Logic Sequencer |
|
Use Scenario: Driving multiple parallel test fixtures from a single controller card with precise timing and isolation. IC Role / Device Role / Timing Role: Octal inverting buffer with fast enable/disable (13 ns) for synchronized fixture activation/deactivation. Use Value: Reduces fixture crosstalk by ensuring only one group is active at a time, improving measurement repeatability and reducing ground bounce. |
Use Scenario: Interfacing microcontroller GPIOs to high-current gate drivers in multi-axis servo amplifier boards. IC Role / Device Role / Timing Role: Inverting buffer isolating MCU logic from noisy motor drive return paths while preserving signal polarity. Use Value: Prevents motor-induced noise from coupling into MCU I/O via shared ground, eliminating spurious interrupt triggers and firmware lockups. |
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,653 | TTL-compatible inputs (VIH = 2.0 V min), identical SO20 package and pinout | Better interoperability with legacy 5 V TTL logic families; slightly higher ICC at VCC = 5.5 V | Select when interfacing with 74LS/74ALS devices or where input threshold stability across temperature is critical. |
| SN74HC240N | DIP-20 package, same electrical specs but through-hole mounting, no thermal pad | Suitable for prototyping and low-volume manual assembly; lacks SO20's thermal performance and board space efficiency | Choose only for breadboard evaluation or legacy DIP-based designs; not recommended for production PCBs. |
Compared with 74HCT240D,653, the 74HC240D,653 offers superior noise immunity in mixed-voltage systems due to its CMOS-input thresholds scaling with VCC, while SN74HC240N trades thermal and density advantages for mechanical assembly flexibility - making the SO20 variant optimal for volume industrial PCBs requiring reliability and compactness.
Availability
74HC240D,653 is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy ISA bus interfaces, automated test equipment (ATE), and motor control logic sequencers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HC240D,653 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 semiconductors, delivering high-performance, reliable components for automotive, industrial, mobile, and computing applications.
The 74HC240D,653 belongs to Nexperia's 74HC logic family - designed specifically for low-power, high-noise-immunity digital interfacing in industrial automation and embedded control systems operating across -40 °C to +125 °C.
FAQ
What is the maximum clock frequency supported by the 74HC240D,653?
The 74HC240D,653 is not a clocked device and has no internal clock; it is a combinational buffer. Its usable frequency depends on propagation delay and load capacitance. With 15 pF load and VCC = 5.0 V, tpd = 9 ns (typical), supporting reliable data rates up to ~50 MHz for clean edge transitions in bus applications.
Can 74HC240D,653 drive LEDs directly?
No - its outputs are rated for ±7.8 mA at VCC = 4.5 V, insufficient for typical indicator LEDs requiring 10–20 mA. It is designed for logic-level bus driving, not power switching. Use external transistor drivers or dedicated LED drivers for such applications.
Is the SO20 package lead-free and RoHS-compliant?
Yes - the 74HC240D,653 in SOT163-1 package is manufactured per Nexperia's standard RoHS-compliant process, with lead-free terminations and halogen-free molding compound, meeting EU Directive 2011/65/EU and JEDEC JS-001 Class 2 ESD requirements.
How does the input clamp diode affect interfacing with 3.3 V logic?
The integrated clamp diodes allow safe connection of 3.3 V logic inputs to the 74HC240D,653 powered at 5 V, provided a series current-limiting resistor (e.g., 1 kΩ) is used to restrict IVI to <20 mA. This avoids level shifters while protecting against overvoltage stress.
74HC240D,653 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HC
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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,653 FAQ
1.How can I place an order for 74HC240D,653 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC240D,653 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,653 reliable?
The price and inventory of 74HC240D,653 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC240D,653 is usually 5 days.
3.What payment methods are accepted for 74HC240D,653?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC240D,653 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC240D,653?
74HC240D,653 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC240D,653 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,653?
For technical support, including 74HC240D,653 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC240D,653 requirements.
6.How does Aetrix verify that 74HC240D,653 is sourced from the original manufacturer or authorized distributors?
All 74HC240D,653 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,653 meets industry standards.
7.What is the process for return or replacement of 74HC240D,653?
All 74HC240D,653 units undergo pre-shipment inspection (PSI). If there is an issue with 74HC240D,653, 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,653 part is unused and in its original packaging.
Return procedure for 74HC240D,653:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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