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Texas Instruments SN74LVTH244ANSR
- Part No.:
- SN74LVTH244ANSR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74LVTH244ANSR.pdf
- Description:
- IC BUFFER NON-INVERT 3.6V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:662
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Product details
Overview
SN74LVTH244ANSR from Texas Instruments is a 3.3-V ABT octal buffer/driver with 3-state outputs, designed for mixed-mode signal operation (5-V inputs/outputs with 3.3-V VCC). It features bus-hold on all data inputs, Ioff and power-up 3-state for hot insertion, and supports unregulated battery operation down to 2.7 V. Used in level-shifting interfaces between 3.3-V logic and legacy 5-V systems.
For engineers reviewing the SN74LVTH244ANSR datasheet, SN74LVTH244ANSR pinout, SN74LVTH244ANSR application, or SN74LVTH244ANSR equivalent, key selection criteria include its 20-pin SOP-NS package, ±100 µA Ioff, 0.55 V typical VOL at 64 mA, bus-hold input retention, and guaranteed operation from −40°C to +85°C.
Technical Context
The SN74LVTH244ANSR implements two independent 4-bit noninverting buffers, each with dedicated output-enable (OE) control (1OE and 2OE). Its ABT (Advanced BiCMOS Technology) architecture delivers TTL-compatible output drive while operating from a 3.3-V supply, enabling seamless interfacing between 3.3-V microcontrollers and 5-V peripheral buses.
Active bus-hold circuitry maintains valid logic states on floating A-inputs without external resistors, and the Ioff feature disables outputs during power-down to prevent backflow current. Power-up 3-state ensures high-impedance outputs during VCC ramp-up, eliminating bus contention in hot-swap applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - supports wide-input unregulated battery rails and tolerates supply droop during transient loads. |
| IOL (max) | 64 mA per output - drives standard TTL loads directly without external buffering. |
| tPZL (max) | 5.4 ns at VCC = 3.3 V - enables fast bus enable/disable timing for high-throughput data transfers. |
| VIK | −1.2 V - withstands negative input transients common in noisy industrial environments. |
| Ioff | ±100 µA - blocks damaging current flow when powered off, critical for live-insertion backplane designs. |
| Bus-Hold Current | ±750 µA dynamic hold - actively retains logic state on unused inputs, eliminating need for pullup/pulldown resistors. |
| θJA | 60°C/W (NS package) - defines thermal derating for continuous operation in enclosed industrial enclosures. |
Pinout & Package
SOP-NS package: 20-pin plastic small-outline package, 0.635 mm pitch, 7.5 mm × 13.0 mm body, 2.0 mm max height, RoHS-compliant NiPdAu lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Output-enable control inputs | Active-low enables respective 4-bit buffer sections; tied to VCC via pullup for power-up high-Z safety. |
| 1A1–1A4, 2A1–2A4 | Data inputs | Eight buffered inputs with integrated bus-hold; tolerate 5-V signals while powered from 3.3-V VCC. |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state buffered outputs | Drive 5-V TTL loads with VOH ≥ 2.0 V and VOL ≤ 0.55 V at full rated current. |
| VCC | Power supply | 3.3-V nominal supply; accepts 2.7–3.6 V range for brownout resilience in battery-powered systems. |
| GND | Ground reference | Common return for all I/O and supply currents; requires low-impedance PCB plane for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode 5-V/3.3-V interface | Accepts 5-V inputs and drives 5-V TTL loads while powered from 3.3-V VCC, eliminating level translators. |
| Bus-hold on all data inputs | Eliminates external pullup/pulldown resistors on unused or floating inputs, reducing BOM count and board space. |
| Ioff and power-up 3-state | Prevents backflow current during power-down and forces outputs to high-Z during VCC ramp, enabling safe hot insertion. |
| Low ground bounce (VOLP < 0.8 V) | Minimizes switching noise coupling into shared ground planes, improving signal integrity in dense digital systems. |
| Latch-up immunity > 500 mA | Meets JESD17 requirements, ensuring robust operation under ESD and transient overvoltage conditions. |
Applications
| Industrial PLC Backplane Interface | Embedded Microcontroller Bus Expansion |
|---|---|
|
Use Scenario: Interfacing a 3.3-V ARM Cortex-M7 MCU to legacy 5-V I/O modules on a DIN-rail mounted PLC backplane. IC Role / Device Role / Timing Role: Level-shifting octal buffer providing bidirectional 5-V tolerant data path with controlled enable timing. Use Value: Eliminates discrete level translators and pull resistors, reducing component count by 12+ parts per interface while guaranteeing hot-swap compatibility. |
Use Scenario: Expanding GPIO count of a 3.3-V RISC-V SoC to drive multiple 5-V sensors and actuators in an edge gateway. IC Role / Device Role / Timing Role: Noninverting 3-state driver enabling time-multiplexed access to shared 5-V peripheral bus. Use Value: Delivers 64 mA sink capability per output-sufficient to drive LED indicators, relay coils, and optocouplers without external drivers. |
| Automotive Body Control Module | Test Equipment Signal Conditioning |
|
Use Scenario: Isolating 3.3-V CAN controller logic from 5-V LIN transceivers and lamp drivers in a BCM. IC Role / Device Role / Timing Role: Fault-tolerant buffer with Ioff protection during module power cycling. Use Value: Prevents backfeed into powered-down subsystems during ignition sequencing, meeting ISO 16750-2 load-dump immunity requirements. |
Use Scenario: Conditioning digital stimulus signals from a 3.3-V pattern generator before injection into 5-V DUTs in ATE. IC Role / Device Role / Timing Role: Low-skew, high-drive buffer ensuring clean edge integrity across mismatched voltage domains. Use Value: Achieves sub-4 ns propagation delay variation (tPLH/tPHL) for precise timing margin analysis in high-speed functional test. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC244APWR | Lower drive (24 mA IOL), no bus-hold, LVC logic family | Requires external pull resistors; unsuitable for floating-bus or hot-swap use cases | Select when cost sensitivity outweighs hot-insertion and bus-hold requirements |
| SN74AHCT244N | 5-V only supply (4.5–5.5 V), TTL-compatible inputs/outputs | Cannot interface 3.3-V controllers directly; requires level translation upstream | Select only in pure 5-V systems where 3.3-V compatibility is unnecessary |
Compared with SN74LVC244APWR and SN74AHCT244N, the SN74LVTH244ANSR uniquely combines 3.3-V operation, 5-V I/O tolerance, integrated bus-hold, and Ioff protection-making it the sole choice for robust mixed-voltage hot-swap interfaces without added components.
Availability
SN74LVTH244ANSR is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and embedded test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LVTH244ANSR 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 industrial-grade logic and interface solutions.
The SN74LVTH244ANSR belongs to TI's ABT logic family, engineered specifically for reliable mixed-voltage system interfacing in harsh environments where hot-swap, latch-up immunity, and wide supply tolerance are mandatory.
FAQ
What is the maximum output sink current supported by the SN74LVTH244ANSR?
The SN74LVTH244ANSR supports up to 64 mA per output in the low state (IOL = 64 mA) at VCC = 3.3 V, enabling direct drive of TTL loads, LEDs, and small relays without external amplification. This rating is guaranteed across the full −40°C to +85°C operating range and is validated per TI's production test flow.
Does the SN74LVTH244ANSR require external pullup resistors on its inputs?
No, the SN74LVTH244ANSR includes active bus-hold circuitry on all eight data inputs (1A1–1A4, 2A1–2A4), which maintains valid logic states on floating or unused inputs. External pullup or pulldown resistors are not recommended and would interfere with bus-hold functionality.
Can the SN74LVTH244ANSR be used in hot-swap applications?
Yes, the SN74LVTH244ANSR supports hot insertion via dual mechanisms: Ioff circuitry disables outputs when VCC = 0 V, preventing backflow current, and power-up 3-state forces outputs to high-impedance during VCC ramp-up-both features explicitly validated per TI's SCAS586J datasheet.
What is the thermal resistance (θJA) of the SN74LVTH244ANSR in its SOP-NS package?
The SN74LVTH244ANSR in the SOP-NS package has a junction-to-ambient thermal resistance (θJA) of 60°C/W, measured per JEDEC JESD51-7 on a standard 4-layer PCB with 1-in² copper pour. This value enables thermal design margin calculation for continuous operation at full output loading in ambient temperatures up to +85°C.
Is the SN74LVTH244ANSR compatible with 5-V logic systems?
Yes, the SN74LVTH244ANSR supports mixed-mode operation: its inputs accept 0–5.5 V signals and its outputs drive 5-V TTL loads while powered from a 3.3-V supply. This eliminates external level shifters in 3.3-V controller to 5-V peripheral interfaces, as confirmed in the "Support Mixed-Mode Signal Operation" feature section of the datasheet.
SN74LVTH244ANSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVTH
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Buffer, Non-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-SO
SN74LVTH244ANSR FAQ
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Please submit a Request for Quotation (RFQ) for SN74LVTH244ANSR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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The price and inventory of SN74LVTH244ANSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH244ANSR is usually 5 days.
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5.How can I obtain technical support or documentation for SN74LVTH244ANSR?
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6.How does Aetrix verify that SN74LVTH244ANSR is sourced from the original manufacturer or authorized distributors?
All SN74LVTH244ANSR 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 SN74LVTH244ANSR meets industry standards.
7.What is the process for return or replacement of SN74LVTH244ANSR?
All SN74LVTH244ANSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH244ANSR, 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 SN74LVTH244ANSR part is unused and in its original packaging.
Return procedure for SN74LVTH244ANSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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