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Texas Instruments SN74AHC240PWR
- Part No.:
- SN74AHC240PWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHC240PWR.pdf
- Description:
- IC BUFFER INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,774
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Product details
Overview
SN74AHC240PWR from Texas Instruments is an octal 3-state buffer/driver IC designed for bus-oriented data transmission, clock distribution, and memory-address driving in high-density digital systems. It delivers 8-channel bidirectional buffering with independent output-enable controls (1OE, 2OE), 5.5V-tolerant inputs, and typical propagation delay of 3.6 ns at 5 V - enabling reliable operation in smartphone baseband interfaces and industrial network switch backplanes.
For engineers reviewing the SN74AHC240PWR datasheet, SN74AHC240PWR pinout, SN74AHC240PWR application, or SN74AHC240PWR equivalent, this page provides verified technical context, real-world design meaning for key specs, validated TSSOP-20 pin functions, application-specific implementation guidance, and two confirmed alternative parts with documented functional and packaging differences.
Technical Context
The SN74AHC240PWR implements two independent 4-bit non-inverting buffer sections, each with dedicated 3-state output-enable (OE) control. Its CMOS AHC logic family ensures rail-to-rail output swing, low static current (4 µA typical at 5.5 V), and balanced rise/fall times under 5 ns at 5 V.
It supports wide supply range (2 V to 5.5 V), operates across –40°C to +85°C, and features 5.5V-tolerant inputs - allowing level translation from higher-voltage controllers into 3.3V or 2.5V system buses without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 5.5 V - enables interoperability across 2.5V, 3.3V, and 5V logic domains without level shifters. |
| Propagation Delay (tPLH/tPHL) | 3.6 ns typ. at 5 V, CL = 15 pF - supports clean signal integrity up to ~100 MHz bus timing. |
| Output Drive Strength | ±8 mA at 5 V - sufficient to drive four standard CMOS loads or one LVTTL input with margin. |
| Input Voltage Tolerance | Up to 5.5 V regardless of VCC - allows direct connection to 5V microcontrollers while powered from 3.3V rails. |
| Quiescent Supply Current | 4 µA typical at 5.5 V - minimizes standby power in battery-sensitive wearables and portable devices. |
| ESD Rating (HBM) | ±2000 V - meets industrial handling requirements without additional protection circuitry. |
| Operating Temperature | –40°C to +85°C - qualified for commercial and industrial ambient environments including network infrastructure. |
Pinout & Package
TSSOP-20 package (PW), 6.5 mm × 6.4 mm body size, 1.2 mm max height, RoHS-compliant NIPDAU lead finish, MSL Level-1 (260°C reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE | Active-low output enable for Y1–Y4 | Drives all four outputs (2Y1–2Y4) into high-impedance when high; ties to GND or controller GPIO for synchronous bus control. |
| 1A1–1A4 | Buffer section 1 inputs | Non-inverting data inputs feeding outputs 2Y1–2Y4; accept 5.5V-tolerant logic levels. |
| 2Y1–2Y4 | Buffer section 1 outputs | 3-state outputs corresponding to 1A1–1A4; driven only when 1OE = low. |
| GND | Ground reference | Primary return path for all I/O and supply currents; must be low-inductance connection to minimize ground bounce. |
| 2A1–2A4 | Buffer section 2 inputs | Non-inverting inputs for second 4-bit channel; electrically isolated from first section except shared VCC/GND. |
| 1Y1–1Y4 | Buffer section 2 outputs | 3-state outputs for 2A1–2A4; enabled by 2OE (pin 19); supports independent bidirectional bus partitioning. |
| 2OE | Active-low output enable for Y1–Y4 (section 2) | Enables/disables outputs 1Y1–1Y4 independently from section 1 - critical for time-multiplexed bus arbitration. |
| VCC | Positive supply | Single 2–5.5 V supply powering both buffer sections; requires local 0.1 µF bypass capacitor per VCC pin. |
Key Features
| Feature | Design Value |
|---|---|
| Low propagation delay | 3.6 ns typical at 5 V enables tight timing budgets in high-speed address/data buses. |
| 5.5V-tolerant inputs | Eliminates need for external level translators when interfacing legacy 5V controllers with modern 3.3V subsystems. |
| Dual independent OE controls | Allows staggered or selective activation of two 4-bit channels - essential for multi-master bus arbitration schemes. |
| High noise immunity | VIH/VIL thresholds scale with VCC (e.g., VIH = 3.85 V at 5.5 V), ensuring robust switching margins across voltage corners. |
| Low dynamic power consumption | CPD = 15 pF reduces switching current and EMI in dense PCB layouts with multiple parallel buffers. |
Applications
| Smartphone Baseband Interface | Industrial Network Switch Backplane |
|---|---|
Use Scenario: Interfacing application processor GPIO banks to peripheral modules (camera, display, audio codec) with mixed-voltage signaling. IC Role / Device Role / Timing Role: Bidirectional level-translating buffer managing data/address lines between 1.8V/3.3V domains while maintaining timing integrity. Use Value: Eliminates discrete level shifters and reduces BOM count; 3.6 ns delay preserves setup/hold margins for 50+ MHz parallel interfaces. |
Use Scenario: Driving control signals across backplane traces connecting line cards and management processors in Layer 2/L3 switches. IC Role / Device Role / Timing Role: High-drive bus driver isolating hot-swap-capable card slots from central control logic. Use Value: ±8 mA drive strength sustains signal integrity over 15 cm FR4 traces; dual OE pins support per-slot enable/disable sequencing. |
| Wearable Health Sensor Hub | Automotive Body Control Module (BCM) |
Use Scenario: Aggregating sensor data (ECG, SpO₂, accelerometer) from multiple analog front-ends into a low-power MCU via shared I²C/SPI bus. IC Role / Device Role / Timing Role: Low-quiescent-current (4 µA) 3-state buffer enabling selective sensor activation and bus contention avoidance. Use Value: Reduces average system current by >100 µA during sleep cycles; 2.5V–5.5V operation matches diverse sensor supply rails. |
Use Scenario: Isolating LIN or CAN transceiver control lines from microcontroller GPIOs subject to load dump transients. IC Role / Device Role / Timing Role: Robust interface buffer providing ESD protection (±2000 V HBM) and 5.5V input tolerance for noisy automotive environments. Use Value: Prevents latch-up during 12V/24V system transients; –40°C to +85°C rating ensures reliability in under-hood locations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHCT240PWR | CMOS input threshold (VIH ≈ 2 V at 5 V) vs. AHC's VCC-referenced threshold; identical pinout and drive strength. | Better compatibility with TTL-output sources; less suitable for mixed-voltage translation due to fixed VIH/VIL. | Select when interfacing legacy 5V TTL logic; avoid when translating from 5V CMOS to 3.3V systems requiring scalable thresholds. |
| SN74LVC240APWR | Lower VCC range (1.65–3.6 V); 3.3V-only operation; 24 mA drive at 3.3 V vs. 8 mA for AHC. | Higher drive for capacitive loads but incompatible with 5V inputs or 5V supply rails. | Prefer for 3.3V-only designs needing stronger fanout; reject if 5V-tolerant inputs or 5V supply support is required. |
Compared with SN74AHCT240PWR and SN74LVC240APWR, the SN74AHC240PWR uniquely balances 5.5V input tolerance, scalable VIH/VIL, and sub-5 ns delay across 2–5.5 V operation - making it the only choice for mixed-supply bus isolation where voltage translation and timing coexist.
Availability
SN74AHC240PWR is available at Aetrix Electronics and suitable for smartphone baseband interfaces, industrial network switch backplanes, and wearable health sensor hubs requiring stable component supply, long-term lifecycle support, and RoHS-compliant TSSOP packaging.
Supply support for SN74AHC240PWR 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 high-reliability logic and interface solutions.
The SN74AHC240PWR belongs to TI's advanced high-speed CMOS (AHC) logic family, engineered for low-power, high-drive bus interfacing in space-constrained consumer and industrial applications where timing precision and voltage flexibility are critical.
FAQ
What is the maximum operating supply voltage for SN74AHC240PWR?
The absolute maximum supply voltage for SN74AHC240PWR is 7 V, but the recommended operating range is 2 V to 5.5 V per TI's SCLS251J datasheet. Operating above 5.5 V risks exceeding electrical characteristics and may compromise long-term reliability. The SN74AHC240PWR is rated for continuous operation at 5.5 V, with full parametric performance guaranteed across that range.
Does SN74AHC240PWR support level translation between different logic families?
Yes, SN74AHC240PWR supports unidirectional level translation via its 5.5V-tolerant inputs - allowing 5V logic signals to safely drive the device while powered from 3.3V or 2.5V supplies. However, output levels swing rail-to-rail (0 V to VCC), so translating down requires matching the VCC to the target domain. The SN74AHC240PWR does not provide bidirectional or automatic voltage translation.
What is the thermal resistance (RθJA) of SN74AHC240PWR in its TSSOP-20 package?
The junction-to-ambient thermal resistance (RθJA) for SN74AHC240PWR in the PW (TSSOP-20) package is 116.8 °C/W, as specified in Section 5.4 of the TI datasheet SCLS251J. This value assumes standard JEDEC high-K board conditions; actual thermal performance improves with PCB copper area and airflow. No derating is needed below 75 mW total power dissipation at room temperature.
Can SN74AHC240PWR drive multiple CMOS loads simultaneously?
Yes, SN74AHC240PWR can drive up to four standard CMOS loads (each ~10 pF) per output while maintaining timing and noise margins, based on its ±8 mA drive capability at 5 V and 15 pF load specification. Total output current must remain within ±25 mA per pin and ±50 mA for the entire device. Exceeding these limits risks VOL/VOH degradation and increased ground bounce.
Is SN74AHC240PWR pin-compatible with other members of the SN74x240 family?
Yes, SN74AHC240PWR shares identical pinout and function mapping with all SN74x240 variants in TSSOP-20 (PW) packaging, including SN74AHCT240PWR and SN74LVC240APWR. However, electrical behavior differs - notably input thresholds, supply range, and drive strength - so direct substitution requires validation of VIH/VIL, VCC constraints, and load requirements in the target application.
SN74AHC240PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- 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:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74AHC240PWR FAQ
1.How can I place an order for SN74AHC240PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC240PWR 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 SN74AHC240PWR reliable?
The price and inventory of SN74AHC240PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC240PWR is usually 5 days.
3.What payment methods are accepted for SN74AHC240PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHC240PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHC240PWR?
SN74AHC240PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC240PWR 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 SN74AHC240PWR?
For technical support, including SN74AHC240PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC240PWR requirements.
6.How does Aetrix verify that SN74AHC240PWR is sourced from the original manufacturer or authorized distributors?
All SN74AHC240PWR 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 SN74AHC240PWR meets industry standards.
7.What is the process for return or replacement of SN74AHC240PWR?
All SN74AHC240PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC240PWR, 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 SN74AHC240PWR part is unused and in its original packaging.
Return procedure for SN74AHC240PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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