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NXP Semiconductors 74HCT240PW,112
- Part No.:
- 74HCT240PW,112
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74HCT240PW,112.pdf
- Description:
- IC BUFFER INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:21,993
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Product details
Overview
74HCT240PW,112 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,112 datasheet, 74HCT240PW,112 pinout, 74HCT240PW,112 application, or 74HCT240PW,112 equivalent, key selection criteria include TTL-level input compatibility, dual independent 4-bit 3-state control (1OE/2OE), guaranteed operation from −40 °C to +125 °C, and low dynamic power dissipation (CPD = 30 pF per buffer).
Technical Context
The 74HCT240PW,112 implements two independent 4-bit inverting buffer sections, each controlled by a dedicated active-low output enable (1OE, 2OE). Its TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V) ensure seamless interfacing with legacy 5 V logic families.
Each output delivers rail-to-rail switching with defined VOH ≥ 3.98 V and VOL ≤ 0.26 V at IO = ±6 mA, and transitions into high-impedance state within 13 ns (ten) and out of it within 13 ns (tdis) under 4.5 V supply-enabling fast, glitch-free bus sharing in multiplexed memory or peripheral interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - supports standard 5 V TTL systems without level-shifting. |
| Input Logic Type | TTL-compatible - VIH ≥ 2.0 V, VIL ≤ 0.8 V at VCC = 5 V; eliminates need for external voltage translation. |
| Propagation Delay | 9 ns (typ) at VCC = 5.0 V, CL = 15 pF - enables reliable operation in 50 MHz+ address/data strobe timing windows. |
| Output Drive | ±6 mA - sufficient to drive 50 Ω transmission lines or 10 LSTTL loads directly. |
| 3-State Enable/Disable | ten = 13 ns, tdis = 13 ns (max) at VCC = 4.5 V - ensures clean bus arbitration with minimal contention window. |
| Operating Temperature | −40 °C to +125 °C - qualified for extended industrial and under-hood automotive auxiliary applications. |
| Power Dissipation Cap | CPD = 30 pF per buffer - allows accurate dynamic power estimation: PD = 30 × VCC² × fi × 8 + Σ(CL × VCC² × fo). |
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 high-density PCB layouts with moderate thermal dissipation (Ptot = 500 mW, derates 10.0 mW/K above 100 °C).
| 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) outputs. |
| 2,4,6,8 | 1A0–1A3 | Inverting data inputs for first 4-bit section - drive corresponding 1Yn outputs with polarity inversion. |
| 18,16,14,12 | 1Y0–1Y3 | Inverting 3-state outputs for first group - high-impedance when 1OE = HIGH; otherwise Yn = NOT(An). |
| 17,15,13,11 | 2A0–2A3 | Inverting data inputs for second 4-bit section - functionally identical to 1A0–1A3 but controlled by 2OE. |
| 3,5,7,9 | 2Y0–2Y3 | Inverting 3-state outputs for second group - isolated bus segment control with independent enable timing. |
| 10 | GND | Digital ground reference - must be low-impedance connection to minimize switching noise coupling. |
| 20 | VCC | Positive supply - bypass with 100 nF ceramic capacitor near pin to suppress supply transients. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V - interoperable with 74LS, 74F, and microcontroller GPIOs without pull-ups or translators. |
| Dual independent 3-state control | Separate 1OE and 2OE pins - enables time-multiplexed access to two distinct 4-bit buses (e.g., address vs. data) on shared traces. |
| High noise immunity | Typical HNM = 0.8 V at VCC = 5 V - rejects >400 mV of coupled noise on input lines in noisy industrial environments. |
| ESD robustness | HBM >2000 V, CDM >1000 V - withstands handling and board-level ESD events without latch-up or parameter shift. |
| Wide temperature range | Specified from −40 °C to +125 °C - validated for use in motor drives, PLC I/O modules, and power supply monitoring circuits. |
Applications
| Industrial Bus Isolation | Microcontroller Address Buffering |
|---|---|
|
Use Scenario: Isolating multiple SPI peripherals sharing a common MISO line while preventing signal contention during chip select transitions. IC Role / Device Role / Timing Role: Inverting 3-state buffer providing direction-controlled bidirectional data path with sub-15 ns enable/disable timing. Use Value: Eliminates need for external diodes or MOSFET switches; reduces BOM count and layout area while guaranteeing bus release within 13 ns. |
Use Scenario: Driving 16-bit address bus from an 8-bit microcontroller with external memory mapping via ALE strobe. IC Role / Device Role / Timing Role: Octal inverting buffer latching upper/lower address byte with simultaneous 3-state control for bus multiplexing. Use Value: Supports 50 MHz address setup/hold timing via 9 ns propagation delay and rail-to-rail VOH/VOL margins at ±6 mA load. |
| Legacy System Interface Adapter | Programmable Logic I/O Expansion |
|
Use Scenario: Interfacing modern FPGA I/O banks (3.3 V LVCMOS) to legacy 5 V TTL backplane signals in test equipment. IC Role / Device Role / Timing Role: Level-translating buffer with TTL input thresholds and 5 V CMOS output swing - no external bias required. Use Value: Achieves safe 5 V ↔ 3.3 V translation using only VCC = 5 V supply and internal clamping diodes - avoids discrete resistor networks. |
Use Scenario: Expanding CPLD I/O count for driving LED arrays and relay drivers in HVAC control panels. IC Role / Device Role / Timing Role: High-drive 3-state buffer enabling dynamic reconfiguration of output groups via OE pins synchronized to system clock. Use Value: Delivers 6 mA sink/source per output - sufficient to drive 20 mA LEDs directly or interface with ULN2003A inputs without series resistors. |
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 |
|---|---|---|---|
| SN74HCT240N | DIP-20 package; wider 6.35 mm lead pitch; higher thermal resistance (RθJA = 70 °C/W vs. 100 °C/W for TSSOP). | Suitable for prototyping and through-hole assembly; unsuitable for high-density SMT production. | Select for breadboard evaluation or legacy DIP-based designs where reflow compatibility is not required. |
| 74LVC240APW | 3.3 V only (1.65–3.6 V); lower VOH (≥2.4 V @ 24 mA); faster tpd (5.2 ns typ @ 3.3 V). | Optimized for low-voltage portable systems; incompatible with 5 V buses without level shifting. | Choose when system operates exclusively at 3.3 V and speed >40 MHz is critical; avoid for mixed-voltage 5 V domains. |
Compared with SN74HCT240N and 74LVC240APW, the 74HCT240PW,112 uniquely balances 5 V TTL compatibility, TSSOP20 space efficiency, and −40 °C to +125 °C operation - making it optimal for industrial-grade SMT designs requiring direct legacy logic interfacing without voltage translation.
Availability
74HCT240PW,112 is available at Aetrix Electronics and suitable for industrial automation controllers, programmable logic interface modules, and embedded test instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HCT240PW,112 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, analog, and MOSFET solutions with focus on reliability, efficiency, and sustainability - headquartered in Nijmegen, Netherlands.
The 74HCT240PW,112 belongs to Nexperia's industry-standard 74HCT logic family, engineered specifically for robust 5 V TTL-to-CMOS interfacing in harsh industrial and automotive-adjacent environments.
FAQ
What is the maximum clock frequency supported by the 74HCT240PW,112 in a bus-driving role?
The 74HCT240PW,112 does not operate as a clocked device but as a combinatorial buffer. Its 9 ns typical propagation delay at 5 V and 15 pF load supports reliable data/address transfer up to approximately 55 MHz in synchronous bus applications, assuming setup/hold margins exceed 3 ns. Maximum usable frequency depends on total trace capacitance and driver strength in the specific layout.
Can 74HCT240PW,112 be used with a 3.3 V supply?
No - the 74HCT240PW,112 is specified only for 4.5 V to 5.5 V operation. At 3.3 V, input thresholds become undefined, VOH drops below 2.4 V, and output drive falls below specification. For 3.3 V systems, use the pin-compatible 74LVC240APW instead, which is characterized from 1.65 V to 3.6 V.
How should unused inputs and outputs be handled?
Unused inputs must be tied HIGH or LOW (not left floating) to prevent increased ICC and noise susceptibility; unused outputs may be left unconnected when their associated OE is held HIGH (disabled state). For best EMI performance, tie unused 1A/2A inputs to GND or VCC via 10 kΩ resistors, and avoid routing unused Y pins near sensitive analog traces.
Does the exposed pad on the TSSOP20 package require soldering or grounding?
No - the exposed pad on SOT360-1 is non-functional and electrically isolated. Per Nexperia documentation, it has no electrical or mechanical requirement to be soldered. If soldered, the land must remain floating or be connected to GND; connecting it to any other net risks internal shorting or thermal stress-induced delamination.
74HCT240PW,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HCT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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-TSSOP
74HCT240PW,112 FAQ
1.How can I place an order for 74HCT240PW,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT240PW,112 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,112 reliable?
The price and inventory of 74HCT240PW,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT240PW,112 is usually 5 days.
3.What payment methods are accepted for 74HCT240PW,112?
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4.How is shipping managed for 74HCT240PW,112?
74HCT240PW,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT240PW,112 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,112?
For technical support, including 74HCT240PW,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT240PW,112 requirements.
6.How does Aetrix verify that 74HCT240PW,112 is sourced from the original manufacturer or authorized distributors?
All 74HCT240PW,112 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,112 meets industry standards.
7.What is the process for return or replacement of 74HCT240PW,112?
All 74HCT240PW,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT240PW,112, 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,112 part is unused and in its original packaging.
Return procedure for 74HCT240PW,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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