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Texas Instruments SN74AUCH240RGYR
- Part No.:
- SN74AUCH240RGYR
- Manufacturer:
- Texas Instruments
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
SN74AUCH240RGYR.pdf
- Description:
- IC BUFFER INVERT 2.7V 20VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,190
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Product details
Overview
SN74AUCH240 from Texas Instruments is an octal noninverting 3-state buffer/driver optimized for 1.8-V operation with 3.6-V I/O tolerance, 1.7-ns max propagation delay at 1.8 V, ±8-mA output drive, and bus-hold inputs-used in memory address buffering, clock distribution, and low-voltage bus interfacing.
For engineers reviewing the SN74AUCH240 datasheet, SN74AUCH240 pinout, SN74AUCH240 application, or SN74AUCH240 equivalent, key selection criteria include sub-1-V operability (0.8 V min), Ioff partial-power-down support, 20-µA max ICC, and QFN-20 (RGY) package compatibility with high-density PCB layouts.
Technical Context
The SN74AUCH240 integrates two independent 4-bit noninverting buffers, each with dedicated active-low output-enable (OE) control. Its dual-OE architecture enables selective 3-state control of each 4-bit group, supporting asymmetric bus gating in mixed-voltage systems.
It implements TI's AUCH logic family architecture: sub-1-V threshold MOSFETs enable 0.8-V to 2.7-V operation; integrated bus-hold circuitry eliminates external bias resistors on all eight A inputs; and Ioff protection disables outputs during power-down to prevent backflow current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 0.8 V to 2.7 V - supports ultra-low-voltage SoC interfaces and battery-powered subsystems |
| tpd Max | 1.7 ns at 1.8 V, CL = 15 pF - enables high-speed address/data buffering in DDR memory controllers |
| I/O Tolerance | 3.6 V - allows safe interfacing with 3.3-V or 2.5-V peripherals while powered from 1.8-V rail |
| Output Drive | ±8 mA at 1.8 V - sufficient to drive four LVTTL loads or one 50-Ω transmission line |
| ICC Max | 20 µA - reduces quiescent power in always-on system management circuits |
| Bus-Hold | Integrated on all eight A inputs - removes need for 10-kΩ external pullup/pulldown resistors |
| Ioff Support | Active at VCC = 0 V - prevents damaging current flow when SN74AUCH240 is unpowered in hot-swap applications |
Pinout & Package
SN74AUCH240 is housed in a 20-pin QFN package (RGY) with 0.5-mm pitch, 3.5-mm × 4.5-mm body, and exposed thermal pad. The package supports reflow soldering and provides low-inductance ground path via the center pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output-enable controls for first and second 4-bit buffer sections |
| 2–5, 12–15 | 1Y1–1Y4, 2Y1–2Y4 | Noninverting 3-state outputs - high-impedance when OE = high |
| 6–9, 16–19 | 1A1–1A4, 2A1–2A4 | Data inputs with integrated bus-hold - retain last valid logic state when floating |
| 10 | VCC | Core supply pin - must be decoupled with 100-nF ceramic capacitor near pin |
| 20 | GND | Ground reference - connected to exposed thermal pad for thermal and EMI performance |
Key Features
| Feature | Design Value |
|---|---|
| Sub-1-V Operability | Functional down to 0.8-V VCC - enables direct interface with advanced low-power microcontrollers and FPGA I/O banks |
| 3.6-V I/O Tolerance | Withstands 3.6-V input/output signals at any VCC between 0.8 V and 2.7 V - simplifies level-shifting in mixed-mode signal domains |
| Integrated Bus-Hold | Eliminates external bias resistors on all eight data inputs - reduces BOM count and PCB area in space-constrained designs |
| Ioff Partial-Power-Down | Disables outputs and blocks reverse current when VCC = 0 V - required for PCIe, USB, and hot-plug peripheral isolation |
| Latch-Up Immunity | Exceeds 100 mA per JESD 78 Class II - ensures robustness in industrial environments with transient voltage events |
Applications
| Memory Address Buffering | Clock Distribution Network |
|---|---|
Use Scenario: Driving address lines from a low-voltage CPU core to multiple SRAM or Flash devices operating at higher I/O voltages. IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating and strengthening address bus signals with precise timing control. Use Value: Enables reliable 0.8-V to 1.8-V core-to-peripheral communication without external level shifters or pull resistors. | Use Scenario: Distributing a single clock source to multiple low-power logic blocks in portable medical or IoT sensor hubs. IC Role / Device Role / Timing Role: Low-skew, low-power clock fanout buffer with independent enable control per 4-bit group. Use Value: Delivers 1.7-ns tpd and <20-µA ICC to maintain timing integrity while minimizing system standby current. |
| Low-Voltage Bus Transceiver Interface | Hot-Swappable Peripheral Isolation |
Use Scenario: Interfacing a 1.8-V FPGA I/O bank with legacy 2.5-V or 3.3-V peripheral buses in modular test equipment. IC Role / Device Role / Timing Role: Voltage-tolerant bidirectional bus driver with configurable 3-state control for read/write direction management. Use Value: 3.6-V I/O tolerance and bus-hold inputs eliminate level-shifter ICs and reduce signal integrity risk on shared data lines. | Use Scenario: Isolating add-in cards (e.g., CAN or RS-485 modules) from main controller during live insertion/removal. IC Role / Device Role / Timing Role: Ioff-enabled 3-state buffer preventing backfeed current when card VCC is disconnected. Use Value: Meets JESD78 Class II latch-up immunity and supports safe hot-swap operation without system reset or brownout. |
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 |
|---|---|---|---|
| SN74LVC240APWR | Higher VCC range (1.65–3.6 V); no sub-1-V operation; 32-mA drive at 3.3 V; no bus-hold | Requires external pull resistors; suited for 3.3-V dominant systems with higher drive needs | Choose when 3.3-V compatibility and stronger drive outweigh ultra-low-VCC requirements |
| SN74AUC240RGYR | Same RGY package and pinout; identical bus-hold and Ioff; slightly higher tpd (2.1 ns @ 1.8 V) | Drop-in replacement with minor timing trade-off; same thermal and layout footprint | Valid alternative if SN74AUCH240RGYR is unavailable and 0.4-ns tpd margin is acceptable |
Compared with SN74LVC240APWR, SN74AUCH240RGYR delivers true sub-1-V operation and integrated bus-hold but trades off peak drive strength; versus SN74AUC240RGYR, it achieves tighter timing (1.7 ns vs. 2.1 ns) at 1.8 V with identical pin compatibility and power-down behavior.
Availability
SN74AUCH240RGYR is available at Aetrix Electronics and suitable for memory address buffering, clock distribution networks, and low-voltage bus transceiver interfaces requiring stable component supply across industrial, medical, and portable electronics programs.
Supply support for SN74AUCH240RGYR 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 high-reliability, energy-efficient IC design.
The SN74AUCH240 belongs to TI's Advanced Ultra-CMOS (AUCH) logic family, engineered specifically for ultra-low-voltage, high-speed 3-state buffering in next-generation portable and battery-operated systems.
FAQ
What is the minimum operating voltage for SN74AUCH240RGYR?
The SN74AUCH240RGYR operates down to 0.8 V VCC, enabling direct integration with sub-1-V processor cores and ultra-low-power sensor nodes. This specification is verified across –40°C to 85°C and confirmed in the recommended operating conditions table of the SCES431A datasheet. Operation below 0.8 V is not characterized or guaranteed for SN74AUCH240RGYR.
Does SN74AUCH240RGYR require external pullup resistors on its inputs?
No, SN74AUCH240RGYR includes integrated bus-hold circuitry on all eight A inputs, which actively retains the last valid logic state when inputs are floating. Using external pullup or pulldown resistors with SN74AUCH240RGYR is explicitly discouraged in the datasheet, as it may interfere with bus-hold functionality and increase power consumption.
Can SN74AUCH240RGYR safely interface with 3.3-V signals while powered from 1.8 V?
Yes, SN74AUCH240RGYR supports 3.6-V I/O tolerance across its entire specified VCC range (0.8 V to 2.7 V). When powered from 1.8 V, it accepts and drives signals up to 3.6 V on all A and Y pins - making SN74AUCH240RGYR ideal for mixed-voltage domain bridging without external level shifters.
How does the Ioff feature function in SN74AUCH240RGYR during power-down?
The Ioff circuitry in SN74AUCH240RGYR disables all outputs and blocks current flow when VCC = 0 V, preventing damaging backflow from live I/O traces into the unpowered device. This behavior is tested per JESD78 and ensures SN74AUCH240RGYR meets hot-swap and partial-power-down requirements in modular systems.
What is the thermal resistance (θJA) of the SN74AUCH240RGYR package?
The SN74AUCH240RGYR in the RGY (20-pin QFN) package has a specified junction-to-ambient thermal resistance (θJA) of 37°C/W under standard JEDEC test conditions. This value assumes proper PCB layout with the exposed thermal pad soldered to a minimum 1-in² copper pour, as documented in TI's SCES431A datasheet section "Absolute Maximum Ratings."
SN74AUCH240RGYR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AUCH
- Package/Case:
- 20-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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:
- 9mA, 9mA
- Voltage - Supply:
- 0.8V ~ 2.7V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-VQFN (3.5x4.5)
SN74AUCH240RGYR FAQ
1.How can I place an order for SN74AUCH240RGYR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AUCH240RGYR 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 SN74AUCH240RGYR reliable?
The price and inventory of SN74AUCH240RGYR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AUCH240RGYR is usually 5 days.
3.What payment methods are accepted for SN74AUCH240RGYR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AUCH240RGYR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AUCH240RGYR?
SN74AUCH240RGYR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AUCH240RGYR 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 SN74AUCH240RGYR?
For technical support, including SN74AUCH240RGYR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AUCH240RGYR requirements.
6.How does Aetrix verify that SN74AUCH240RGYR is sourced from the original manufacturer or authorized distributors?
All SN74AUCH240RGYR 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 SN74AUCH240RGYR meets industry standards.
7.What is the process for return or replacement of SN74AUCH240RGYR?
All SN74AUCH240RGYR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AUCH240RGYR, 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 SN74AUCH240RGYR part is unused and in its original packaging.
Return procedure for SN74AUCH240RGYR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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