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Texas Instruments SN74HC240PW
- Part No.:
- SN74HC240PW
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74HC240PW.pdf
- Description:
- IC BUFFER INVERT 6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:330
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Product details
Overview
SN74HC240PW 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 SN74HC240PW datasheet, SN74HC240PW pinout, SN74HC240PW application, or SN74HC240PW equivalent, key selection criteria include its dual 4-bit inverting architecture, independent OE controls, TSSOP-20 package compatibility, and verified 3-state bus-driving capability under 2–6V supply conditions.
Technical Context
The SN74HC240PW implements two independent 4-bit inverting buffer sections, each with dedicated output-enable (OE) inputs. When OE is low, inverted logic passes from A inputs to Y outputs; when OE is high, all eight outputs enter high-impedance state - enabling bidirectional bus contention management without external logic.
Its CMOS HC-family design ensures TTL-compatible input thresholds, rail-to-rail output swing, and robust noise immunity. The device supports CL = 50 pF and CL = 150 pF loads, with tpd ranging from 9ns (VCC = 6V, CL = 50 pF) to 32ns (VCC = 6V, CL = 150 pF), making it suitable for both high-speed and noise-tolerant system interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2V to 6V - supports mixed-voltage system interfacing and battery-backed operation |
| Output Drive Capability | ±6mA at 5V - sufficient to drive 15 LSTTL loads directly without buffering |
| Propagation Delay (tpd) | 9ns typical at VCC = 6V, CL = 50 pF - enables sub-100MHz bus timing margins |
| Quiescent Current (ICC) | ≤80µA max - enables low-static-power operation in always-on subsystems |
| Input Leakage Current | ≤1µA max - prevents unintended logic transitions on unterminated or high-impedance inputs |
| 3-State Enable/Disable Time | ten = 13ns, tdis = 21ns typical at VCC = 6V - ensures fast bus arbitration and minimal bus turnaround latency |
Pinout & Package
TSSOP-20 package: 6.50mm × 6.4mm body size, 0.65mm lead pitch, 2mm max height, RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low enable inputs controlling respective 4-bit inverting sections - must be pulled low for functional output |
| 2–4, 6–8, 11–13, 15–17 | 1A1–1A4, 2A1–2A4 | Eight buffered input terminals accepting standard CMOS/TTL logic levels |
| 3–5, 7, 9, 12, 14, 16, 18 | 1Y1–1Y4, 2Y1–2Y4 | Eight inverting 3-state outputs - high-impedance when corresponding OE is high |
| 10 | GND | Ground reference for all internal circuitry and I/O - requires low-inductance connection to system ground plane |
| 20 | VCC | Primary power supply input - requires local 0.1µF ceramic bypass capacitor placed within 2mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| Inverting 3-state buffer architecture | Dual independent 4-bit sections allow selective bus isolation and polarity inversion per channel group |
| Wide supply voltage range | 2V–6V operation enables interoperability across 3.3V, 5V, and mixed-voltage logic domains |
| Low dynamic power consumption | 35pF typical power dissipation capacitance per buffer - minimizes switching current in high-frequency bus applications |
| High noise immunity | VIH = 3.15V / VIL = 1.35V at VCC = 4.5V - provides >1.3V noise margin against EMI and crosstalk |
Applications
| Memory Address Buffering | Industrial Bus Interface |
|---|---|
Use Scenario: Driving 20-bit address lines from a microcontroller to multiple SRAM or EPROM devices sharing a common data/address bus. IC Role / Device Role / Timing Role: Inverting 3-state buffer isolating CPU address outputs and enabling multi-device address decoding without contention. Use Value: Eliminates need for discrete pull-up resistors and reduces board space by integrating eight matched drivers with independent enable control. | Use Scenario: Interfacing PLC I/O modules to a central controller via shared RS-485 or CAN transceiver bus with addressable node selection. IC Role / Device Role / Timing Role: Bidirectional bus driver managing isolated address/data routing between controller and field devices using hardware-selectable 3-state control. Use Value: Enables deterministic bus arbitration with <32ns enable/disable timing, preventing signal collisions during hot-swap or reconfiguration events. |
| Legacy System Logic Translation | Test Equipment Signal Conditioning |
Use Scenario: Converting 3.3V FPGA I/O signals to 5V TTL-compatible levels for legacy instrumentation peripherals. IC Role / Device Role / Timing Role: Level-shifting inverting buffer providing voltage translation while maintaining signal integrity and timing alignment. Use Value: Achieves reliable 5V logic compatibility without external level shifters, leveraging built-in VIH/VIL thresholds and rail-to-rail output swing. | Use Scenario: Conditioning digital trigger and clock signals in automated test equipment before distribution to multiple DUT channels. IC Role / Device Role / Timing Role: Low-skew, high-drive buffer distributing synchronized timing signals with controlled rise/fall times and minimal jitter addition. Use Value: Delivers <13ns propagation delay variation across all eight outputs, ensuring sub-nanosecond skew for parallel test vector execution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT240PW | TTL-input thresholds (VIH = 2V min), identical pinout and function | Better compatibility with legacy 5V TTL sources; slightly higher ICC (≤160µA) | Select when interfacing with older 5V TTL logic families requiring guaranteed recognition of 2V+ inputs |
| 74LCX240MTCX | Lower VCC range (2.0–3.6V), 3.6V-tolerant I/O, smaller TSSOP-20 footprint (5.0×4.4mm) | Optimized for 3.3V-only systems with strict board area constraints; not 5V-supply compatible | Select for compact 3.3V designs where 5V operation is unnecessary and space savings outweigh voltage flexibility |
Compared with SN74HCT240PW and 74LCX240MTCX, the SN74HC240PW offers the broadest supply range (2–6V) and lowest quiescent power, making it optimal for mixed-voltage industrial systems requiring long-term reliability and wide operating margin.
Availability
SN74HC240PW is available at Aetrix Electronics and suitable for industrial control systems, embedded instrumentation, and legacy interface bridging requiring stable component supply and long-lifecycle support.
Supply support for SN74HC240PW 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 logic solutions with over 50 years of innovation in industrial, automotive, and communications markets.
The SN74HC240PW belongs to TI's 74HC logic family, engineered for high-speed, low-power 3-state bus interfacing in memory, clock, and address driver applications across industrial and commercial environments.
FAQ
What is the maximum operating temperature range for the SN74HC240PW?
The SN74HC240PW is rated for operation from –40°C to +85°C ambient temperature. This industrial-grade temperature range is validated per TI's recommended operating conditions and supported by thermal metrics including RθJA = 131.8°C/W for the PW (TSSOP-20) package. Derating is required above 70°C ambient if power dissipation exceeds 150mW.
Does the SN74HC240PW support 3.3V-only operation?
Yes, the SN74HC240PW fully supports 3.3V operation: VIH = 2.31V and VIL = 0.99V at VCC = 3.3V, providing >1.3V noise margin. Its 2V–6V supply range ensures reliable functionality across 3.3V systems, and output drive remains ≥±4mA at 3.3V - sufficient for driving 10 LSTTL loads or modern 3.3V CMOS inputs.
How are the output-enable (OE) pins configured on the SN74HC240PW?
The SN74HC240PW has two active-low output-enable pins: 1OE (Pin 1) controls Y1–Y4 outputs, and 2OE (Pin 19) controls Y1'–Y4' outputs. When either OE is high, its associated four outputs enter high-impedance state regardless of input states. Both OEs must be low for full 8-bit functionality. Unused OE pins should be tied to GND to ensure defined operation.
Can the SN74HC240PW drive a 150pF capacitive load reliably?
Yes, the SN74HC240PW is characterized for CL = 150pF loads: tpd = 13ns (max 38ns), ten = 17ns (max 51ns), and tdis = 21ns (max 53ns) at VCC = 6V. These values confirm stable timing performance into heavy bus loads, provided PCB layout minimizes trace inductance and uses proper grounding - consistent with TI's application guidance for high-capacitance bus driving.
Is the SN74HC240PW pin-compatible with other packages in the SN74HC240 family?
Yes, the SN74HC240PW shares identical pin configuration and function mapping with all SN74HC240 variants (e.g., DW, DB, NS, DGS), as confirmed by TI's Pin Configuration and Functions table. All 20-pin packages use the same top-view numbering and signal assignment - enabling direct PCB footprint substitution between TSSOP, SOIC, SSOP, and SOP variants without redesign.
SN74HC240PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- 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:
- 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
SN74HC240PW FAQ
1.How can I place an order for SN74HC240PW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC240PW 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 SN74HC240PW reliable?
The price and inventory of SN74HC240PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC240PW is usually 5 days.
3.What payment methods are accepted for SN74HC240PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC240PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC240PW?
SN74HC240PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC240PW 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 SN74HC240PW?
For technical support, including SN74HC240PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC240PW requirements.
6.How does Aetrix verify that SN74HC240PW is sourced from the original manufacturer or authorized distributors?
All SN74HC240PW 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 SN74HC240PW meets industry standards.
7.What is the process for return or replacement of SN74HC240PW?
All SN74HC240PW units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC240PW, 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 SN74HC240PW part is unused and in its original packaging.
Return procedure for SN74HC240PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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