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Nexperia USA Inc. 74HCT240PW,118
- Part No.:
- 74HCT240PW,118
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74HCT240PW,118.pdf
- Description:
- IC BUFFER INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,970
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Product details
Overview
74HCT240PW,118 from Nexperia is an octal inverting 3-state buffer/line driver in TSSOP20 package, operating from 4.5 V to 5.5 V with TTL-compatible inputs, 11 ns typical propagation delay at 4.5 V, and ±6 mA output drive-used for bidirectional bus isolation and address/data buffering in industrial microcontroller interfaces.
For engineers reviewing the 74HCT240PW,118 datasheet, 74HCT240PW,118 pinout, 74HCT240PW,118 application, or 74HCT240PW,118 equivalent, this page delivers verified pin functions, real-world timing specs (tpd, ten, tdis), thermal-rated package data (SOT360-1), and direct substitution guidance for legacy 74-series bus drivers in high-density PCB layouts.
Technical Context
The 74HCT240PW,118 implements two independent 4-bit inverting buffers, each controlled by a dedicated active-low output enable (1OE, 2OE), enabling selective bus segment isolation without signal inversion conflict. Its TTL-level input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V) ensure compatibility with legacy 5 V logic families while maintaining CMOS power efficiency.
Each of the eight outputs drives ±6 mA at VCC = 4.5 V with guaranteed VOL ≤ 0.26 V and VOH ≥ 3.98 V, supporting robust noise margins in noisy industrial environments. The device operates across -40 °C to +125 °C and features integrated input clamp diodes for safe interfacing to voltages exceeding VCC when used with current-limiting resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Inverting octal buffer with dual 3-state control (1OE/2OE) |
| Supply Voltage Range | 4.5 V to 5.5 V - matches standard 5 V TTL systems without level shifting |
| Propagation Delay (tpd) | 11 ns typ @ VCC = 4.5 V, CL = 15 pF - enables reliable operation up to ~45 MHz bus toggle rates |
| Output Drive | ±6 mA @ VCC = 4.5 V - sufficient to drive 50 Ω transmission lines or multiple 74-series inputs |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - ensures clean recognition of TTL logic levels |
| Operating Temperature | -40 °C to +125 °C - qualified for under-hood, motor control, and industrial PLC applications |
| Power Dissipation | CPD = 30 pF per buffer - enables accurate dynamic power estimation in high-frequency switching |
Pinout & Package
TSSOP20 package (SOT360-1): 20-pin thin shrink small outline, 4.4 mm body width, 0.65 mm pitch, exposed pad not electrically connected - optimized for automated assembly and thermal performance in space-constrained designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output enables - 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 12,14,16,18) 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 |
| 3,5,7,9 | 2Y0–2Y3 | Inverting 3-state outputs for group 2 - high-impedance when 2OE = HIGH |
| 10 | GND | Ground reference - must be low-impedance connection for noise immunity and output stability |
| 20 | VCC | Positive supply - bypass with 100 nF ceramic capacitor near pin for transient suppression |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | VIH/VIL thresholds match 5 V TTL families - eliminates need for external level shifters |
| Dual independent 3-state control | Separate 1OE/2OE pins allow concurrent management of two isolated bus segments |
| Input clamp diodes | Enable safe interface to signals > VCC using series current-limiting resistors |
| ESD protection | HBM > 2000 V, CDM > 1000 V - enhances reliability during handling and board assembly |
| Wide temperature range | Specified from -40 °C to +125 °C - supports deployment in automotive engine bays and industrial drives |
Applications
| Industrial PLC I/O Expansion | Microcontroller Address Bus Isolation |
|---|---|
|
Use Scenario: Isolating microcontroller address lines from high-noise relay driver circuits in programmable logic controllers. IC Role / Device Role / Timing Role: Inverting 3-state buffer providing direction-controlled signal isolation between MCU and peripheral ICs. Use Value: Prevents back-driving and ground bounce during hot-swap of I/O modules while maintaining <12 ns timing integrity. |
Use Scenario: Buffering 8-bit address lines between an ARM Cortex-M4 and parallel NOR flash memory in embedded firmware update systems. IC Role / Device Role / Timing Role: Octal inverting driver ensuring clean, slew-controlled address transitions to meet flash access setup/hold windows. Use Value: Delivers 6 mA drive strength and 11 ns tpd to support 20 MHz address bus toggling without signal degradation. |
| Legacy System Bus Interface | Test Equipment Signal Conditioning |
|
Use Scenario: Interfacing modern FPGA-based test controllers to legacy 74-series TTL backplanes in semiconductor ATE fixtures. IC Role / Device Role / Timing Role: Level-shifting and fanout buffer converting FPGA LVTTL outputs to full 5 V TTL swing with controlled edge rates. Use Value: TTL input thresholds and 5 V supply compatibility eliminate discrete level translators, reducing BOM count and layout area. |
Use Scenario: Driving multiple DUT (device-under-test) inputs simultaneously from a single pattern generator channel in benchtop test setups. IC Role / Device Role / Timing Role: 3-state-enabled fanout buffer allowing dynamic reconfiguration of stimulus paths without hardware rewiring. Use Value: Dual OE control permits real-time routing of test vectors to different DUT sections while maintaining signal integrity via matched trace lengths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT240N | DIP-20 package; no thermal pad; higher parasitic inductance; 15 ns tpd (slower) | Suitable only for prototyping or through-hole boards; not for high-speed or high-density layouts | Select only if manual soldering or breadboard validation is required before TSSOP migration. |
| 74LVC240APW | 3.3 V only (1.65–3.6 V); lower drive (±24 mA); faster tpd (5.5 ns); different VIH/VIL | Requires level translation when interfacing to 5 V systems; unsuitable for mixed-voltage buses without translators | Choose only for new 3.3 V-only designs where speed and low power outweigh voltage compatibility needs. |
Compared with SN74HCT240N and 74LVC240APW, the 74HCT240PW,118 uniquely balances 5 V TTL interoperability, TSSOP space efficiency, and industrial temperature resilience-making it the optimal choice for upgrading legacy 74240-based systems without redesigning power or signal integrity.
Availability
74HCT240PW,118 is available at Aetrix Electronics and suitable for industrial automation, test equipment, and embedded controller applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for 74HCT240PW,118 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 high-volume, high-reliability logic, analog, and MOSFET solutions - delivering energy-efficient, robust components for industrial, automotive, and consumer markets.
The 74HCT240PW,118 belongs to Nexperia's industry-standard 74HCT logic family, engineered specifically for seamless integration into 5 V TTL-compatible digital systems requiring low-power, high-noise-immunity bus interfacing.
FAQ
Can 74HCT240PW,118 operate at 3.3 V?
No. The 74HCT240PW,118 is specified only for 4.5 V to 5.5 V operation per its recommended conditions table. At 3.3 V, input thresholds (VIH = 2.0 V min) become marginal, and output drive degrades significantly - use 74LVC240 instead for 3.3 V systems.
What is the maximum capacitive load this device can drive reliably?
Per dynamic characteristics, the 74HCT240PW,118 is characterized up to 50 pF load capacitance with defined tpd, ten, and tdis. For loads >50 pF, propagation delay increases linearly; derating curves in Figure 6 show measurable rise/fall time degradation beyond 100 pF.
Is the exposed pad on the TSSOP20 package electrically connected?
No. The exposed pad in SOT360-1 is a mechanical thermal enhancement feature only. Per Nexperia's datasheet note, it has no electrical function and should remain floating or be connected to GND solely for thermal conduction - no circuit connectivity is required or recommended.
How does the dual OE architecture improve system design?
Dual OE (1OE/2OE) allows independent control of two 4-bit output groups, enabling simultaneous but separate bus arbitration - e.g., isolating memory address lines from peripheral control lines without adding extra logic or timing skew, simplifying PCB routing and reducing gate count.
74HCT240PW,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HCT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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:
- 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-TSSOP
74HCT240PW,118 FAQ
1.How can I place an order for 74HCT240PW,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT240PW,118 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 74HCT240PW,118 reliable?
The price and inventory of 74HCT240PW,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT240PW,118 is usually 5 days.
3.What payment methods are accepted for 74HCT240PW,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT240PW,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT240PW,118?
74HCT240PW,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT240PW,118 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 74HCT240PW,118?
For technical support, including 74HCT240PW,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT240PW,118 requirements.
6.How does Aetrix verify that 74HCT240PW,118 is sourced from the original manufacturer or authorized distributors?
All 74HCT240PW,118 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 74HCT240PW,118 meets industry standards.
7.What is the process for return or replacement of 74HCT240PW,118?
All 74HCT240PW,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT240PW,118, 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 74HCT240PW,118 part is unused and in its original packaging.
Return procedure for 74HCT240PW,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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