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Texas Instruments SN74HC240PWR
- Part No.:
- SN74HC240PWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74HC240PWR.pdf
- Description:
- IC BUFFER INVERT 6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,036
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Product details
Overview
SN74HC240PWR from Texas Instruments is an octal inverting buffer/line driver with 3-state outputs, designed for memory address and bus driving applications. It operates from 2V to 6V, delivers ±6mA output drive at 5V, exhibits typical propagation delay of 9ns, and consumes ≤80µA ICC - enabling high-density, low-power bus interfacing in industrial control and embedded systems.
For engineers reviewing the SN74HC240PWR datasheet, SN74HC240PWR pinout, SN74HC240PWR application, or SN74HC240PWR equivalent, key selection criteria include its dual 4-bit inverted 3-state architecture, TSSOP-20 package compatibility with space-constrained PCBs, guaranteed 3-state enable timing (ten/tdis), and verified operation across –40°C to +85°C industrial temperature range.
Technical Context
The SN74HC240PWR implements two independent 4-bit inverting buffers, each with dedicated active-low output-enable (1OE, 2OE) inputs. When OE is low, data passes inverted from A-inputs to Y-outputs; when OE is high, all eight outputs enter high-impedance state - enabling bidirectional bus control without external logic.
Its CMOS HCMOS design ensures rail-to-rail input thresholds (VIH/VIL specified at 2V/4.5V/6V), low input current (≤1µA), and robust noise immunity. The device supports CL = 50 pF and CL = 150 pF loads, with switching characteristics fully characterized for both conditions per TI SCLS128H.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2V to 6V - supports mixed-voltage system interfacing (e.g., 3.3V logic driving 5V buses) |
| Output Drive (5V) | ±6mA - sufficient to drive 15 LSTTL loads directly, eliminating need for external buffers |
| Propagation Delay (tpd) | 9ns typical at VCC = 4.5V, CL = 50pF - enables reliable operation in 33MHz+ address/data strobe paths |
| 3-State Enable Time (ten) | 15ns max at VCC = 4.5V, CL = 50pF - ensures fast bus release for time-critical arbitration protocols |
| Quiescent Current (ICC) | 80µA max at VCC = 6V - critical for low-power standby modes in battery-backed controllers |
| Input Capacitance (Ci) | 10pF max - minimizes loading on upstream drivers and preserves signal integrity in fanout-heavy nets |
| Operating Temperature | –40°C to +85°C - qualified for industrial automation, motor drives, and programmable logic controllers |
Pinout & Package
TSSOP-20 (PW) package: 6.50mm × 6.4mm body size, 0.65mm lead pitch, 1.2mm max height - optimized for automated assembly and thermal performance in dense layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output-enable controls for Group 1 (pins 2–9) and Group 2 (pins 11–18); enables independent bus segment control |
| 2, 4, 6, 8, 11, 13, 15, 17 | 1A1–1A4, 2A1–2A4 | Inverting input terminals - logic inversion occurs internally; no external inverters required |
| 3, 5, 7, 9, 12, 14, 16, 18 | 1Y1–1Y4, 2Y1–2Y4 | Inverting 3-state outputs - high-impedance state isolates driven lines during bus contention or idle cycles |
| 10 | GND | Ground reference for all logic and output stages; must be low-inductance connection to minimize ground bounce |
| 20 | VCC | Power supply input - requires local 0.1µF ceramic bypass capacitor placed within 3mm of pin per TI layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Inverting 3-state architecture | Dual independent 4-bit groups allow selective bus isolation while maintaining signal polarity inversion where needed |
| Wide VCC range (2V–6V) | Enables direct interface between 2.5V/3.3V microcontrollers and legacy 5V peripherals without level shifters |
| Low ICC (≤80µA) | Reduces system-level power budget in always-on industrial I/O modules and sensor concentrators |
| Guaranteed tpd ≤30ns (4.5V) | Supports synchronous memory addressing up to 33MHz clock domains with margin for trace delays |
| High noise immunity (VIH/VIL ratios) | Ensures reliable operation in electrically noisy environments like factory floors and motor drive cabinets |
Applications
| Industrial PLC Backplane Interface | Embedded Memory Address Buffering |
|---|---|
|
Use Scenario: Driving multiplexed address lines between a 32-bit ARM Cortex-M7 MCU and multiple SRAM/Flash devices on a modular I/O backplane. IC Role / Device Role / Timing Role: Inverting 3-state buffer isolating address bus segments during chip-select arbitration; enables hot-swap-safe memory expansion. Use Value: Eliminates need for discrete inverters and bus switches; 9ns tpd ensures setup/hold timing compliance at 25MHz bus clocks. |
Use Scenario: Buffering 16-bit address lines from an FPGA configuration controller to parallel EEPROM and FPGA configuration PROMs. IC Role / Device Role / Timing Role: Dual-group 3-state driver providing isolated address routing during FPGA reconfiguration sequences. Use Value: Prevents address bus contention during partial reconfiguration; ±6mA drive sustains signal integrity over 10cm PCB traces. |
| Automotive Body Control Module | Test Equipment Digital Pattern Generator |
|
Use Scenario: Interfacing a 3.3V CAN microcontroller to legacy 5V dashboard display controllers via shared address/data bus. IC Role / Device Role / Timing Role: Level-translating inverting buffer with 3-state control synchronized to CAN message frame boundaries. Use Value: 2V–6V operation eliminates external level shifters; –40°C to +85°C rating meets AEC-Q100 Grade 3 requirements. |
Use Scenario: Generating precise, glitch-free digital stimulus patterns for IC functional testing using a 50MHz pattern generator FPGA. IC Role / Device Role / Timing Role: Output stage driver buffering FPGA I/O pins to DUT test points; 3-state enables dynamic bus direction control. Use Value: 15ns ten/tdis guarantees clean bus turnaround between read/write cycles; low Ci preserves edge rates >100MHz. |
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 |
|---|---|---|---|
| SN74HCT240PWR | CMOS input thresholds referenced to TTL levels (VIH = 2.0V min), higher ICC (≤400µA) | Better compatibility with legacy 5V TTL outputs; less suitable for ultra-low-power sleep modes | Select when interfacing with older 5V TTL logic families where HCMOS VIH/VIL margins are insufficient |
| 74LVC240APW,118 | Lower VCC range (1.65V–3.6V), non-inverting outputs, ±24mA drive at 3.3V | Optimized for 3.3V-only systems; requires external inverters if signal inversion is mandatory | Choose for modern low-voltage designs requiring higher drive strength and smaller footprint (TSSOP-20 same size) |
Compared with SN74HC240PWR, SN74HCT240PWR offers superior TTL-input compatibility but trades off quiescent power; 74LVC240APW,118 delivers higher drive and lower voltage operation but lacks inherent inversion - making SN74HC240PWR optimal for cost-sensitive, mixed-voltage industrial bus buffering where inversion is functionally required.
Availability
SN74HC240PWR is available at Aetrix Electronics and suitable for industrial PLC backplanes, embedded memory subsystems, automotive body control modules, and automated test equipment requiring stable component supply and long-term lifecycle support.
Supply support for SN74HC240PWR 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 heritage in logic IC design and industrial-grade reliability validation.
The SN74HC240PWR belongs to TI's industry-standard 74HC logic family, engineered for high-noise-immunity, low-power, and wide-supply-operation in industrial control, instrumentation, and communications infrastructure.
FAQ
What is the maximum capacitive load the SN74HC240PWR can drive while maintaining specified timing?
The SN74HC240PWR is fully characterized for CL = 50 pF and CL = 150 pF loads per TI SCLS128H. At CL = 150 pF and VCC = 4.5V, tpd remains ≤45ns and ten ≤50ns - confirming reliable operation into heavy bus loads such as multi-drop memory address lines or long ribbon cables. Exceeding 150 pF may degrade timing margins and increase power dissipation.
Does the SN74HC240PWR require external pull-up or pull-down resistors on its OE inputs?
No - the SN74HC240PWR OE inputs are CMOS-compatible with rail-referenced thresholds and ≤1µA leakage. When driven directly by microcontroller GPIOs or FPGA outputs, no external biasing is needed. However, unused OE inputs must be tied to GND (to enable) or VCC (to disable) per TI SCBA004 to prevent floating states and undefined output behavior.
Can the SN74HC240PWR operate reliably at 2.5V supply voltage?
Yes - the SN74HC240PWR is fully specified from 2V to 6V. At VCC = 2.5V, VOH ≥2.3V (IOH = –20µA) and VOL ≤0.2V (IOL = 20µA), meeting standard 2.5V logic thresholds. Propagation delay increases to ~125ns (typical), which remains suitable for sub-10MHz address/data paths in low-power sensor nodes.
Is the SN74HC240PWR pinout compatible with other 20-pin TSSOP octal buffers like the SN74LS240?
No - while both are 20-pin TSSOP octal buffers, the SN74HC240PWR uses a distinct pinout optimized for dual 4-bit groups with separate OE inputs (pins 1 and 19), whereas SN74LS240 has shared OE and non-inverting logic. Direct replacement would require PCB redesign. Always verify pin mapping against TI SCLS128H Figure 3-1 before substitution.
What thermal derating applies to the SN74HC240PWR in a 2-layer PCB with no copper pour?
In a 2-layer board without internal ground/power planes, the SN74HC240PWR (TSSOP-20) exhibits RθJA ≈131.8°C/W per TI SCLS128H. At 80µA ICC and worst-case 6V supply, power dissipation is <0.5mW - resulting in negligible junction temperature rise (<0.07°C). Derating is only relevant under sustained output switching at high frequency and load.
SN74HC240PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- 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:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74HC240PWR FAQ
1.How can I place an order for SN74HC240PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC240PWR 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 SN74HC240PWR reliable?
The price and inventory of SN74HC240PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC240PWR is usually 5 days.
3.What payment methods are accepted for SN74HC240PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC240PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC240PWR?
SN74HC240PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC240PWR 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 SN74HC240PWR?
For technical support, including SN74HC240PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC240PWR requirements.
6.How does Aetrix verify that SN74HC240PWR is sourced from the original manufacturer or authorized distributors?
All SN74HC240PWR 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 SN74HC240PWR meets industry standards.
7.What is the process for return or replacement of SN74HC240PWR?
All SN74HC240PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC240PWR, 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 SN74HC240PWR part is unused and in its original packaging.
Return procedure for SN74HC240PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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