My Inquiry
My Account
Texas Instruments SN74LVTH240RGYR
- Part No.:
- SN74LVTH240RGYR
- Manufacturer:
- Texas Instruments
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
SN74LVTH240RGYR.pdf
- Description:
- IC BUFFER INVERT 3.6V 20VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,001
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74LVTH240RGYR from Texas Instruments is a 3.3-V ABT octal buffer/driver with 3-state outputs, designed for mixed-mode signal interfacing between 3.3-V logic and 5-V systems. It features bus-hold on all data inputs, Ioff support for hot insertion, and operates down to 2.7 V supply. Used in backplane interface, memory address buffering, and industrial control bus isolation.
For engineers reviewing the SN74LVTH240RGYR datasheet, SN74LVTH240RGYR pinout, SN74LVTH240RGYR application, or SN74LVTH240RGYR equivalent, key selection criteria include 3-state output timing (tPZH ≤ 5.6 ns), bus-hold current (±750 µA), thermal resistance (θJA = 37°C/W), and compatibility with unregulated battery supplies.
Technical Context
This device integrates two independent 4-bit noninverting buffers, each with separate output-enable (1OE, 2OE) controls. Outputs enter high-impedance state when OE is high, and pass A→Y when OE is low. Bus-hold circuitry actively maintains valid logic levels on unused inputs without external resistors.
It implements Advanced BiCMOS Technology (ABT) for TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V) while operating at 3.3-V VCC. Ioff and power-up 3-state circuitry prevent backflow current and driver conflict during hot insertion or power sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - supports unregulated battery operation and brownout tolerance |
| IOH / IOL | −32 mA / 64 mA - drives standard TTL loads with margin at 3.3 V |
| tPZH / tPLZ | 1.1 ns / 1.8 ns (min) - fast enable/disable transitions reduce bus contention windows |
| Bus-Hold Current | ±750 µA - maintains stable logic states on floating inputs without pull resistors |
| θJA (RGY) | 37°C/W - enables higher power density in QFN-20 thermal design |
| VOL / VOH | 0.55 V / 2.0 V (max at IOL=64 mA, IOH=−32 mA) - ensures noise margin in mixed-voltage systems |
| Ioff | ±100 µA - blocks damaging current flow during partial power-down |
Pinout & Package
SN74LVTH240RGYR is housed in a 20-pin QFN package (RGY) with 0.5-mm pitch, 4.0 × 4.0 mm body, and exposed thermal pad. Pin 1 index located at top-left corner; package height ≤ 1.0 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output enable | Controls Y1–Y4 and Y1'–Y4' groups independently; must be pulled up for safe power-up |
| 1A1–1A4, 2A1–2A4 | Data inputs | Eight buffered inputs with integrated bus-hold; tolerate 5.5-V input voltage |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state outputs | Noninverting drivers capable of sinking 64 mA or sourcing 32 mA |
| VCC | Power supply | 3.3-V nominal supply; accepts 2.7–3.6 V range for battery-backed operation |
| GND | Ground reference | Common return for logic and output current paths; connects to thermal pad |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage interface | 5-V-tolerant inputs and outputs operate reliably with 3.3-V VCC, enabling direct connection to legacy 5-V buses |
| Hot-insertion support | Ioff and power-up 3-state eliminate backfeed current and bus conflicts during live board replacement |
| Integrated bus-hold | Eliminates need for 10-kΩ external pullup/pulldown resistors on data lines, reducing BOM count and layout area |
| Low ground bounce | VOLP < 0.8 V at VCC = 3.3 V ensures signal integrity during simultaneous switching |
| Latch-up immunity | Exceeds 500 mA per JESD 17, supporting robust operation in noisy industrial environments |
Applications
| Backplane Interface Buffering | Memory Address Latching |
|---|---|
Use Scenario: Isolating CPU address/data bus from peripheral expansion slots in modular industrial controllers. IC Role / Device Role / Timing Role: Octal noninverting buffer with independent 3-state control per group, synchronizing address propagation across mismatched voltage domains. Use Value: Enables reliable 5-V peripheral communication using 3.3-V core logic while eliminating external bus-termination components. | Use Scenario: Driving SRAM or Flash memory address lines in portable medical instrumentation with battery-supplied 3.3-V rails. IC Role / Device Role / Timing Role: Low-skew address driver with bus-hold, maintaining valid addresses during sleep mode or brownout conditions. Use Value: Prevents memory access errors during power transients by holding address lines without external biasing. |
| Industrial I/O Module Isolation | Legacy System Voltage Translation |
Use Scenario: Interfacing microcontroller GPIOs to 24-V PLC input modules via optocoupler front-ends requiring clean digital drive signals. IC Role / Device Role / Timing Role: 3-state buffer providing controlled enable timing and sink/source capability for opto-LED drive circuits. Use Value: Delivers 64-mA low-level drive to ensure optocoupler CTR margin while supporting hot-swap maintenance cycles. | Use Scenario: Bridging FPGA-based control logic (3.3-V) to legacy 5-V UART or SPI peripherals in test equipment. IC Role / Device Role / Timing Role: Bidirectional voltage-tolerant buffer with TTL-compatible thresholds, preserving signal timing integrity across voltage boundaries. Use Value: Avoids level-shifter ICs or discrete transistor solutions, reducing component count and PCB area in space-constrained designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC240APWR | Lower drive strength (IOL = 24 mA), no bus-hold, 1.65–3.6 V VCC range | Suitable for lower-power, single-voltage 3.3-V systems without 5-V interface needs | Select when cost and power efficiency outweigh 5-V tolerance and bus-hold requirements |
| SN74AHCT240N | 5-V-only supply (4.5–5.5 V), higher propagation delay (tPLH up to 9 ns), no Ioff | Designed for legacy 5-V TTL systems only; incompatible with 3.3-V rails | Choose only for pure 5-V designs where ABT performance and mixed-voltage operation are unnecessary |
Compared with SN74LVC240APWR and SN74AHCT240N, SN74LVTH240RGYR uniquely combines 5-V-tolerant I/O, bus-hold, Ioff, and 2.7–3.6 V operation-making it the sole option for robust hot-pluggable mixed-voltage buffering in industrial edge devices.
Availability
SN74LVTH240RGYR is available at Aetrix Electronics and suitable for industrial control backplanes, medical device memory interfaces, and test equipment I/O modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for SN74LVTH240RGYR 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
SN74LVTH240RGYR belongs to TI's ABT logic family, engineered for high-speed, mixed-voltage system interfacing with emphasis on reliability in harsh environments and support for hot-swap infrastructure.
FAQ
What is the maximum operating temperature range for SN74LVTH240RGYR?
The SN74LVTH240RGYR is rated for operation from −40°C to +85°C ambient temperature. This industrial-grade range supports deployment in factory automation, outdoor instrumentation, and other environments where thermal extremes are common. The RGY package's low θJA (37°C/W) helps maintain junction temperature within safe limits under typical load conditions.
Does SN74LVTH240RGYR require external pull-up resistors on its input pins?
No, SN74LVTH240RGYR does not require external pull-up or pull-down resistors on its data inputs due to integrated bus-hold circuitry. Each input actively maintains its last-valid logic state with ±750 µA hold current. Using external resistors with bus-hold enabled is explicitly discouraged in the datasheet and may cause contention or increased power draw.
Can SN74LVTH240RGYR safely interface with 5-V logic signals?
Yes, SN74LVTH240RGYR supports mixed-mode operation: its inputs and outputs tolerate up to 5.5 V regardless of VCC (2.7–3.6 V), enabling direct connection to 5-V TTL buses without external level shifters. Input thresholds (VIH = 2 V, VIL = 0.8 V) match standard TTL, ensuring reliable recognition of 5-V logic levels.
What is the purpose of the Ioff feature in SN74LVTH240RGYR?
The Ioff feature in SN74LVTH240RGYR disables output drivers when VCC = 0 V, preventing damaging current backflow from live system buses into a powered-down device. This enables safe hot insertion and removal in modular backplanes or field-replaceable units, protecting both the SN74LVTH240RGYR and upstream circuitry during partial power cycling.
How does the power-up 3-state function protect systems during boot?
The power-up 3-state circuitry in SN74LVTH240RGYR forces outputs into high-impedance during VCC ramp-up and ramp-down, preventing bus conflicts when multiple drivers initialize asynchronously. This eliminates glitches and contention that could corrupt memory writes or misconfigure peripherals during cold start, warm reset, or brownout recovery sequences.
SN74LVTH240RGYR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVTH
- 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:
- 32mA, 64mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-VQFN (3.5x4.5)
SN74LVTH240RGYR FAQ
1.How can I place an order for SN74LVTH240RGYR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTH240RGYR 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 SN74LVTH240RGYR reliable?
The price and inventory of SN74LVTH240RGYR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH240RGYR is usually 5 days.
3.What payment methods are accepted for SN74LVTH240RGYR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVTH240RGYR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVTH240RGYR?
SN74LVTH240RGYR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVTH240RGYR 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 SN74LVTH240RGYR?
For technical support, including SN74LVTH240RGYR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH240RGYR requirements.
6.How does Aetrix verify that SN74LVTH240RGYR is sourced from the original manufacturer or authorized distributors?
All SN74LVTH240RGYR 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 SN74LVTH240RGYR meets industry standards.
7.What is the process for return or replacement of SN74LVTH240RGYR?
All SN74LVTH240RGYR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH240RGYR, 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 SN74LVTH240RGYR part is unused and in its original packaging.
Return procedure for SN74LVTH240RGYR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74LVTH240RGYR Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
