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NXP Semiconductors 74AHC240PW,112
- Part No.:
- 74AHC240PW,112
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74AHC240PW,112.pdf
- Description:
- IC BUFFER INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,190
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Product details
Overview
74AHC240PW,112 from NXP Semiconductors is an 8-bit inverting buffer/line driver with dual 3-state output enables (1OE and 2OE), operating at 2.0–5.5 V supply, supporting mixed-voltage translation via overvoltage-tolerant inputs, and rated for −40 °C to +125 °C industrial temperature range in TSSOP20 package.
For engineers reviewing the 74AHC240PW,112 datasheet, 74AHC240PW,112 pinout, 74AHC240PW,112 application, or 74AHC240PW,112 equivalent, this device serves as a high-speed, low-power octal inverter with Schmitt-trigger inputs, precise enable-controlled bus isolation, and CMOS-level compatibility-key for bidirectional bus buffering, address/data line driving, and level-shifting in embedded control systems.
Technical Context
The 74AHC240PW,112 implements two independent 4-bit inverting buffers, each controlled by its own active-low output enable (1OE for outputs 1Y0–1Y3; 2OE for 2Y0–2Y3). Its Schmitt-trigger inputs provide noise immunity on slow-rising signals, while input voltage tolerance up to 7.0 V enables safe interfacing between 3.3 V logic and 5 V buses without external level shifters.
It operates strictly with CMOS input thresholds (VIH = 3.85 V min at VCC = 5.5 V; VIL = 1.65 V max), distinguishing it from the TTL-compatible 74AHCT240 variant. Propagation delay is 2.8 ns typical (VCC = 5 V, CL = 15 pF), with enable/disable times under 7.5 ns, supporting high-speed synchronous bus architectures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.0–5.5 V - supports single-supply operation across 2.5 V, 3.3 V, and 5 V logic domains |
| Input Voltage Range | −0.5 V to +7.0 V - enables overvoltage-tolerant interfacing with higher-voltage peripherals |
| Propagation Delay | 2.8 ns typ (VCC = 5 V, CL = 15 pF) - ensures minimal timing skew in high-speed data paths |
| Output Drive | ±8 mA (VCC = 4.5 V) - sufficient to drive standard CMOS loads and moderate PCB traces |
| Operating Temperature | −40 °C to +125 °C - qualified for extended industrial and under-hood automotive-adjacent environments |
| Input Capacitance | 3–10 pF - low loading preserves signal integrity on high-frequency address/control lines |
| ESD Protection | HBM > 2000 V, CDM > 1000 V - robust handling during board assembly and field service |
Pinout & Package
TSSOP20 package (SOT360-1): plastic thin shrink small outline, 20 leads, 4.4 mm body width, 0.65 mm pitch, exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | 1OE | Active-low enable for outputs 1Y0–1Y3; drives all four outputs to high-impedance when HIGH |
| 2, 4, 6, 8 | 1A0–1A3 | Inverting input group A; each inverted and routed to corresponding 1Yn output |
| 3, 5, 7, 9 | 2Y0–2Y3 | Inverting output group B; driven only when 2OE is LOW |
| 10 | GND | Ground reference for all I/O and internal circuitry; must be low-impedance connection |
| 11, 13, 15, 17 | 2A0–2A3 | Inverting input group B; each inverted and routed to corresponding 2Yn output |
| 12, 14, 16, 18 | 1Y0–1Y3 | Inverting output group A; driven only when 1OE is LOW |
| 19 | 2OE | Active-low enable for outputs 2Y0–2Y3; independent control of second buffer bank |
| 20 | VCC | Positive supply rail; decoupling capacitor required within 1 cm of pin |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit enables | Allows selective isolation of two bus segments without affecting the other - critical for memory-mapped peripheral arbitration |
| Schmitt-trigger inputs | Provides >0.8 V hysteresis (at VCC = 5 V), rejecting noise on long traces or unfiltered switch inputs |
| Overvoltage-tolerant inputs | Accepts up to 7.0 V regardless of VCC setting - eliminates need for external clamping diodes in mixed-voltage designs |
| CMOS input compatibility | VIH/VIL thresholds track VCC (e.g., VIH = 3.85 V @ VCC = 5.5 V), ensuring reliable switching with modern low-threshold drivers |
| Low dynamic power | CPD = 9 pF enables sub-1 mW dynamic dissipation at 10 MHz with 50 pF load - suitable for battery-backed subsystems |
Applications
| Industrial PLC I/O Expansion | Embedded Microcontroller Bus Buffering |
|---|---|
Use Scenario: Isolating microcontroller GPIO banks from noisy 24 V digital input modules using optocoupler interfaces. IC Role / Device Role / Timing Role: Inverting buffer translating 3.3 V MCU logic to 5 V-compatible input conditioning circuits while enabling/disabling per module group. Use Value: Dual OE pins allow independent enable control of two I/O groups, reducing software overhead and eliminating bus contention during hot-swap events. | Use Scenario: Driving multiplexed address/data bus lines between an ARM Cortex-M7 and external SRAM or FPGA configuration memory. IC Role / Device Role / Timing Role: Octal inverting driver providing clean, low-skew signal inversion and 3-state isolation during bus turnaround cycles. Use Value: 2.8 ns propagation delay and <7 ns enable time ensure setup/hold timing margins are preserved at 100 MHz bus clock rates. |
| Automotive Body Control Module | Test Equipment Signal Conditioning |
Use Scenario: Level-shifting and buffering LIN bus transceiver control signals between 3.3 V MCU and 5 V analog front-end ICs in door module ECUs. IC Role / Device Role / Timing Role: Voltage-translating inverter with overvoltage-tolerant inputs accepting 5 V wake-up pulses while powered from 3.3 V rail. Use Value: Input tolerance to 7.0 V prevents latch-up during load-dump transients, and −40 °C to +125 °C rating meets AEC-Q100 Grade 2 requirements. | Use Scenario: Conditioning TTL/CMOS-compatible test pattern generator outputs before feeding into DUT stimulus inputs with strict VIH/VIL windows. IC Role / Device Role / Timing Role: Precision inverting buffer ensuring signal polarity inversion and impedance matching for repeatable test vector timing. Use Value: Balanced tPLH/tPHL delays (<0.5 ns skew) and low output capacitance (4 pF) minimize waveform distortion on 50 MHz test clocks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74AHC240D,118 | SO20 package (7.5 mm width); higher thermal resistance (8.0 mW/K derating above 70 °C) | Better suited for through-hole prototyping or legacy PCBs with SOIC footprints | Select when board layout requires wider pitch or manual soldering compatibility |
| SN74AHC240PWR | TSSOP20 from Texas Instruments; identical pinout but VIH/VIL thresholds differ slightly (VIH = 3.5 V min @ VCC = 5 V) | Requires validation of input threshold margin in marginal noise environments | Choose when TI supply chain preference or dual-sourcing strategy applies |
Compared with 74AHC240D,118 and SN74AHC240PWR, the 74AHC240PW,112 offers superior thermal performance in compact layouts (5.5 mW/K derating above 60 °C) and tighter VIH specification (3.85 V min), making it optimal for space-constrained industrial controllers requiring guaranteed noise immunity.
Availability
74AHC240PW,112 is available at Aetrix Electronics and suitable for industrial automation, embedded computing, and automotive body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74AHC240PW,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
NXP Semiconductors is a global semiconductor company specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The 74AHC240PW,112 belongs to NXP's AHC logic family, designed for high-speed, low-power, mixed-voltage interface applications where precision timing, noise immunity, and industrial-grade reliability are essential.
FAQ
What is the maximum input voltage the 74AHC240PW,112 can tolerate?
The 74AHC240PW,112 supports input voltages from −0.5 V to +7.0 V, independent of VCC level. This overvoltage tolerance allows direct connection to 5 V buses while operating from a 3.3 V supply, eliminating external level-shifting components. The 74AHC240PW,112 maintains safe operation as long as input current remains within ±20 mA clamping limits specified in the Absolute Maximum Ratings table.
Does the 74AHC240PW,112 support true bidirectional data flow?
No, the 74AHC240PW,112 is a unidirectional inverting buffer with fixed input-to-output direction (A→Y). It does not implement bus transceivers or auto-direction sensing. Bidirectional operation requires external control logic managing OE pins and separate transmit/receive paths. The 74AHC240PW,112 functions exclusively as a one-way inverting driver with 3-state outputs.
Can the 74AHC240PW,112 replace the 74AHCT240PW in existing designs?
Only with careful validation: the 74AHC240PW,112 uses CMOS input thresholds (VIH ≈ 0.7×VCC), whereas the 74AHCT240PW uses TTL thresholds (VIH = 2.0 V fixed). Swapping may cause logic misreads if driving sources have weak pull-ups or marginal VOH. The 74AHC240PW,112 is not a drop-in replacement unless the system guarantees ≥3.85 V VIH at VCC = 5.5 V.
What is the recommended decoupling for the 74AHC240PW,112?
A 100 nF X7R ceramic capacitor placed within 1 cm of the VCC (pin 20) and GND (pin 10) terminals is mandatory. For systems with multiple 74AHC240PW,112 devices or high-frequency switching, add a 10 µF tantalum or aluminum polymer bulk capacitor per power domain. The 74AHC240PW,112 exhibits low ICC quiescent current (≤4 µA), but transient supply droop during simultaneous output switching necessitates localized high-frequency bypassing.
Is the exposed pad on the TSSOP20 package of the 74AHC240PW,112 electrically connected?
No, the exposed pad on the 74AHC240PW,112's TSSOP20 package (SOT360-1) has no electrical function. Per NXP documentation, it is mechanically attached to the die paddle using conductive die attach material but requires no solder connection. If soldered, the pad must remain floating or be tied to GND - it must never be connected to VCC or left as an uncontrolled node.
74AHC240PW,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74AHC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- 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:
- 8mA, 8mA
- Voltage - Supply:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
74AHC240PW,112 FAQ
1.How can I place an order for 74AHC240PW,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AHC240PW,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 74AHC240PW,112 reliable?
The price and inventory of 74AHC240PW,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AHC240PW,112 is usually 5 days.
3.What payment methods are accepted for 74AHC240PW,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AHC240PW,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AHC240PW,112?
74AHC240PW,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AHC240PW,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 74AHC240PW,112?
For technical support, including 74AHC240PW,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AHC240PW,112 requirements.
6.How does Aetrix verify that 74AHC240PW,112 is sourced from the original manufacturer or authorized distributors?
All 74AHC240PW,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 74AHC240PW,112 meets industry standards.
7.What is the process for return or replacement of 74AHC240PW,112?
All 74AHC240PW,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74AHC240PW,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 74AHC240PW,112 part is unused and in its original packaging.
Return procedure for 74AHC240PW,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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