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Texas Instruments SN74AHCT240PWR
- Part No.:
- SN74AHCT240PWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHCT240PWR.pdf
- Description:
- IC BUFFER INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,767
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Product details
Overview
SN74AHCT240PWR from Texas Instruments is an octal inverting buffer/driver with tri-state outputs, designed for bus-oriented receivers and transmitters in 5-V systems. It features TTL-compatible inputs (VIH = 2 V, VIL = 0.8 V), ±8 mA output drive, 9.5 ns max propagation delay at 5 V/50 pF, and operates from –40°C to +125°C. It enables voltage translation from 3.3-V logic to 5-V buses in network switches and industrial control interfaces.
For engineers reviewing the SN74AHCT240PWR datasheet, SN74AHCT240PWR pinout, SN74AHCT240PWR application, or SN74AHCT240PWR equivalent, key selection criteria include its 20-pin TSSOP package, dual 4-bit inverting tri-state architecture, guaranteed 5-V operation with 3.3-V input compatibility, and latch-up immunity exceeding 250 mA per JESD 17.
Technical Context
The SN74AHCT240PWR implements two independent 4-bit inverting buffer sections, each with dedicated output-enable (OE) control. Its CMOS design with TTL-input thresholds allows seamless interfacing between legacy 3.3-V logic and 5-V bus systems without level shifters.
Each section operates in one of two functional modes: when OE is low, inverted data passes from A inputs to Y outputs; when OE is high, all four outputs enter high-impedance state. Slow edge rates minimize output ringing on lightly loaded buses, supporting reliable signal integrity in noise-sensitive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply | 4.5 V to 5.5 V - ensures stable operation across industrial 5-V rail tolerances |
| VOH / VOL | 3.8 V min / 0.44 V max at 8 mA - guarantees robust logic-high and logic-low margins under load |
| tPLH / tPHL | 9.5 ns max at 5 V/50 pF - defines worst-case timing budget for synchronous bus interface design |
| IOZ Leakage | ±2.5 µA max - maintains high-impedance integrity during tri-state mode, preventing bus contention |
| Input Compatibility | TTL-level (VIH = 2 V, VIL = 0.8 V) - enables direct connection to 3.3-V microcontrollers and FPGAs |
| Operating Temperature | –40°C to +125°C - supports deployment in automotive under-hood and industrial motor-control environments |
| ESD Rating | ±2000 V HBM - meets standard handling requirements for automated assembly and field service |
Pinout & Package
The SN74AHCT240PWR is housed in a 20-pin TSSOP (PW) package measuring 6.50 mm × 6.40 mm (body: 6.50 mm × 4.40 mm), RoHS-compliant with NIPDAU finish and MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE (1 & 2) | Active-low enable controls respective 4-bit inverting buffer group; tie high via pull-up for power-up high-Z safety |
| 2, 4, 6, 8, 11, 13, 15, 17 | A1–A4 (Group 1 & 2) | Eight buffered inverting inputs - accept TTL voltages and drive corresponding Y outputs when OE active |
| 3, 5, 7, 9, 12, 14, 16, 18 | Y1–Y4 (Group 1 & 2) | Eight inverted tri-state outputs - present complemented logic only when OE is low; otherwise high-Z |
| 10 | GND | Ground reference for all logic and output stages; requires local 0.1 µF bypass capacitor |
| 20 | VCC | 5-V supply pin; must be decoupled adjacent to pin to suppress switching noise and ensure timing stability |
Key Features
| Feature | Design Value |
|---|---|
| Inverting tri-state buffering | Dual 4-bit groups allow independent bus direction control and signal inversion without external gates |
| TTL-input compatibility | Accepts 2-V VIH and 0.8-V VIL - eliminates need for external level-shifting circuitry when interfacing 3.3-V controllers |
| Slow edge rate control | Minimizes overshoot/undershoot on PCB traces and connectors, reducing EMI and improving signal integrity |
| Latch-up immunity | Exceeds 250 mA per JESD 17 - ensures robustness against transient current faults in shared-bus environments |
| Low quiescent current | 40 µA max ICC - supports low-power standby modes in battery-backed or energy-conscious systems |
Applications
| Network Switch Interface | Industrial PLC Backplane |
|---|---|
Use Scenario: Isolating and driving address/data lines between 3.3-V FPGA configuration logic and 5-V memory or peripheral bus. IC Role / Device Role / Timing Role: Octal inverting buffer with independent OE control provides bidirectional bus isolation and voltage translation. Use Value: Eliminates discrete level shifters while maintaining timing margin (9.5 ns max delay) and noise immunity on dense backplanes. |
Use Scenario: Interfacing microcontroller I/O ports to 5-V sensor/actuator modules in programmable logic controller racks. IC Role / Device Role / Timing Role: Tri-state driver buffers digital control signals, enabling shared bus arbitration and hot-swap-safe I/O expansion. Use Value: ±25 mA per output and latch-up immunity support rugged industrial transients; 125°C rating suits enclosed cabinet environments. |
| Consumer TV HDMI CEC Bus | Automotive Body Control Module |
Use Scenario: Driving CEC (Consumer Electronics Control) signaling lines between SoC and display subsystems operating at mixed voltage domains. IC Role / Device Role / Timing Role: Inverting buffer translates 3.3-V CEC command pulses to 5-V compliant levels while suppressing ringing on long traces. Use Value: Slow edge rates and 0.44 V VOL guarantee reliable low-level detection across temperature; TTL input thresholds match legacy CEC drivers. |
Use Scenario: Buffering LIN or CAN subsystem control signals between 3.3-V MCU and 5-V analog front-end or relay drivers. IC Role / Device Role / Timing Role: Signal conditioner and voltage translator ensuring interoperability between low-voltage logic and higher-voltage actuation circuits. Use Value: –40°C to +125°C operation and ±2000 V HBM ESD withstand meet automotive AEC-Q100 stress requirements for under-dash modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting tri-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHCT240DW | SOIC-20 package (12.8 mm × 10.3 mm); higher RθJA (81.1°C/W) than PW's 116.8°C/W | Better thermal mass for low-frequency, high-current bursts; less suitable for space-constrained PCBs | Choose for manual assembly or legacy board compatibility where footprint size is not constrained |
| SN74LVC240APWR | 3.3-V supply only (1.65–3.6 V); non-TTL input thresholds (VIH = 2.0 V typical but not guaranteed at 3.3 V) | Not compatible with 5-V bus termination or legacy TTL sources; requires separate 3.3-V rail | Choose only when full system operates at 3.3 V and lower power (10 µA ICC) is prioritized over 5-V interoperability |
Compared with SN74AHCT240DW and SN74LVC240APWR, the SN74AHCT240PWR uniquely combines 5-V operation, guaranteed TTL input compatibility, and compact TSSOP packaging-making it the optimal choice for mixed-voltage industrial and automotive bus interfaces requiring drop-in reliability and layout efficiency.
Availability
SN74AHCT240PWR is available at Aetrix Electronics and suitable for network switches, industrial PLC backplanes, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74AHCT240PWR 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with decades of experience in industrial, automotive, and communications IC design.
The SN74AHCT240PWR belongs to TI's 74AHCT logic family, engineered for robust 5-V bus interfacing with TTL compatibility, latch-up immunity, and wide-temperature operation-targeting industrial control, test equipment, and legacy-system upgrades.
FAQ
What is the maximum output current per pin for SN74AHCT240PWR?
The SN74AHCT240PWR supports ±8 mA DC output current per pin under recommended operating conditions (VCC = 4.5 V to 5.5 V). Absolute maximum continuous output current is ±25 mA per pin, with total device current limited to ±75 mA across all outputs. Exceeding these values risks parametric degradation or latch-up.
Does SN74AHCT240PWR support 3.3-V input logic levels?
Yes, SN74AHCT240PWR explicitly supports 3.3-V input logic: its TTL-compatible input thresholds require only VIH ≥ 2.0 V and VIL ≤ 0.8 V, both comfortably met by standard 3.3-V CMOS outputs. This enables direct connection to 3.3-V microcontrollers without level-shifting circuitry.
What is the operating temperature range for SN74AHCT240PWR?
The SN74AHCT240PWR is rated for operation from –40°C to +125°C, qualifying it for use in demanding industrial and automotive environments. This range is validated per the device's recommended operating conditions and thermal specifications, including RθJA = 116.8°C/W for the TSSOP package.
How does the tri-state functionality work on SN74AHCT240PWR?
SN74AHCT240PWR has two independent output-enable inputs (Pin 1 = OE1, Pin 19 = OE2). When either OE is low, its associated four Y outputs invert and drive the corresponding A inputs. When OE is high, those four outputs enter high-impedance state-electrically disconnecting them from the bus to prevent contention.
Is SN74AHCT240PWR RoHS compliant and what is its moisture sensitivity level?
Yes, SN74AHCT240PWR is RoHS compliant with lead-free NIPDAU finish and carries MSL Level-1 (unlimited floor life at ≤30°C/60% RH), per JEDEC J-STD-020. Its TSSOP package is qualified for peak reflow temperatures up to 260°C, supporting standard lead-free PCB assembly processes.
SN74AHCT240PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- 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:
- 8mA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74AHCT240PWR FAQ
1.How can I place an order for SN74AHCT240PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT240PWR 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 SN74AHCT240PWR reliable?
The price and inventory of SN74AHCT240PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT240PWR is usually 5 days.
3.What payment methods are accepted for SN74AHCT240PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHCT240PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHCT240PWR?
SN74AHCT240PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT240PWR 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 SN74AHCT240PWR?
For technical support, including SN74AHCT240PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT240PWR requirements.
6.How does Aetrix verify that SN74AHCT240PWR is sourced from the original manufacturer or authorized distributors?
All SN74AHCT240PWR 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 SN74AHCT240PWR meets industry standards.
7.What is the process for return or replacement of SN74AHCT240PWR?
All SN74AHCT240PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT240PWR, 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 SN74AHCT240PWR part is unused and in its original packaging.
Return procedure for SN74AHCT240PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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