My Inquiry
My Account
Texas Instruments SN74LVTH244APW
- Part No.:
- SN74LVTH244APW
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVTH244APW.pdf
- Description:
- IC BUF NON-INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:647
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74LVTH244APW 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 industrial backplane interfaces and legacy 5-V system bridging.
For engineers reviewing the SN74LVTH244APW datasheet, SN74LVTH244APW pinout, SN74LVTH244APW application, or SN74LVTH244APW equivalent, key selection criteria include its 20-pin TSSOP package, ±100 µA Ioff at VCC = 0 V, 0.55 V max VOL at IOL = 64 mA, bus-hold current of ±750 µA, and thermal resistance θJA = 83°C/W.
Technical Context
The SN74LVTH244APW implements two independent 4-bit noninverting buffers, each with dedicated output-enable (OE) control. Its ABT (Advanced BiCMOS Technology) architecture enables TTL-compatible input thresholds while operating from a 3.3-V supply, allowing direct interfacing between 3.3-V logic and 5-V buses without level shifters.
It integrates active bus-hold circuitry on all A-inputs to maintain valid logic states when floating, eliminating external pullup/pulldown resistors. The Ioff protection disables outputs during power-down to prevent backflow current, and power-up 3-state ensures high-impedance outputs during supply ramping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - supports unregulated battery operation and tolerates supply droop in portable systems. |
| IOL (max) | 64 mA - drives heavy capacitive loads or multiple TTL inputs without external buffering. |
| VOL (max) | 0.55 V at IOL = 64 mA - ensures robust low-level noise margin in noisy industrial environments. |
| tPZH (max) | 5.3 ns at VCC = 3.3 V - enables high-speed bus enable/disable timing in real-time control loops. |
| Ioff | ±100 µA at VCC = 0 V - prevents damaging current flow during hot-swap or partial power-down scenarios. |
| Bus-Hold Current | ±750 µA - actively holds floating inputs at valid logic levels without external components. |
| θJA | 83°C/W - defines thermal derating in standard PCB layouts using the TSSOP-20 (PW) package. |
Pinout & Package
TSSOP-20 (PW) package: 6.5 mm × 4.4 mm, 0.65 mm pitch, 1.2 mm max height, RoHS-compliant NiPdAu lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Output-enable inputs (active-low) | Independent control of each 4-bit buffer group; must be pulled up to VCC for safe power-up sequencing. |
| 1A1–1A4, 2A1–2A4 | Data inputs | Eight TTL-compatible inputs with integrated bus-hold; tolerate 5-V signals with 3.3-V VCC. |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state buffered outputs | Noninverting outputs capable of sinking 64 mA; enter high-Z when OE is high. |
| VCC | Power supply | 3.3-V nominal supply; supports operation down to 2.7 V with full functionality. |
| GND | Ground reference | Common return path for all I/O and supply currents; requires low-inductance PCB connection. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage tolerance | 5-V input/output compatibility with 3.3-V VCC eliminates need for discrete level translators in hybrid systems. |
| Bus-hold circuitry | Active hold on all eight data inputs removes requirement for external pullup/pulldown resistors, reducing BOM count and board space. |
| Ioff and power-up 3-state | Prevents backflow current and driver contention during hot insertion or power sequencing in modular systems. |
| Low ground bounce (VOLP) | <0.8 V typical at VCC = 3.3 V - maintains signal integrity in high-speed digital backplanes. |
| Latch-up immunity | >500 mA per JESD 17 - ensures robust operation in electrically noisy industrial environments. |
Applications
| Industrial Backplane Interface | Legacy System Bus Bridging |
|---|---|
|
Use Scenario: Interfacing a 3.3-V microcontroller to a 5-V ISA-style backplane in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional signal conditioning and voltage translation for address/data/control lines. Use Value: Eliminates discrete level shifters and reduces layout complexity while maintaining TTL-compatible timing margins. |
Use Scenario: Upgrading aging test equipment with modern 3.3-V FPGA controllers while retaining legacy 5-V peripheral modules. IC Role / Device Role / Timing Role: Octal noninverting buffer with independent OE control for selective bus segment isolation. Use Value: Enables phased hardware migration without redesigning entire backplane wiring or firmware timing. |
| Hot-Swappable Module Control | Embedded Data Acquisition Front-End |
|
Use Scenario: Enabling hot insertion of sensor interface cards into a 3.3-V mainframe chassis with shared 5-V power rails. IC Role / Device Role / Timing Role: Isolation buffer with Ioff and power-up 3-state to prevent bus contention during card insertion/removal. Use Value: Guarantees system stability during field maintenance without requiring full system shutdown. |
Use Scenario: Driving multiplexed analog-to-digital converter control lines and status flags in an isolated measurement module. IC Role / Device Role / Timing Role: Low-noise, high-drive buffer for critical timing-sensitive control signals (e.g., CONV, BUSY). Use Value: Delivers 64 mA sink current and sub-5.5 ns propagation delay to meet tight ADC sampling window requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC244APW | Lower drive strength (24 mA IOL), no bus-hold, no Ioff, 1.65–3.6 V VCC range. | Suitable only for fully 3.3-V systems without hot-swap or floating input concerns. | Select when cost sensitivity outweighs mixed-voltage and robustness requirements. |
| SN74AHCT244PW | 5-V VCC only, higher VOL (0.5 V @ 8 mA), no bus-hold, no Ioff. | Requires 5-V supply and cannot interface directly with 3.3-V logic without external translation. | Choose only for legacy 5-V-only designs where ABT performance advantages are unnecessary. |
Compared with SN74LVC244APW and SN74AHCT244PW, the SN74LVTH244APW uniquely delivers 5-V tolerant inputs, integrated bus-hold, Ioff-enabled hot-swap capability, and 64-mA drive-all within a 3.3-V system context-making it irreplaceable for mixed-voltage industrial backplane applications.
Availability
SN74LVTH244APW is available at Aetrix Electronics and suitable for industrial automation, test equipment, and embedded data acquisition systems requiring stable component supply across extended product lifecycles.
Supply support for SN74LVTH244APW 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 solutions.
The SN74LVTH244A family was engineered for robust mixed-voltage interfacing in harsh environments-specifically targeting industrial backplanes, instrumentation, and legacy system upgrades where reliability and voltage compatibility are critical.
FAQ
What is the maximum recommended supply voltage for SN74LVTH244APW?
The absolute maximum VCC rating for SN74LVTH244APW is 4.6 V, but the recommended operating range is strictly 2.7 V to 3.6 V per TI's SCAS586J datasheet. Operation above 3.6 V risks parametric degradation and violates the device's qualified specification limits, even if functional at elevated voltage.
Does SN74LVTH244APW require external pullup resistors on its data inputs?
No. SN74LVTH244APW includes active bus-hold circuitry on all eight data inputs (1A1–1A4, 2A1–2A4), which maintains valid logic states when inputs float. External pullup or pulldown resistors are explicitly discouraged per the datasheet, as they conflict with bus-hold operation and may increase power consumption or cause metastability.
Can SN74LVTH244APW safely interface with 5-V CMOS logic outputs?
Yes. SN74LVTH244APW accepts input voltages up to 7 V (absolute max) and is specified for 5-V-tolerant operation with 3.3-V VCC. Its VIH threshold is 2.0 V minimum, ensuring reliable recognition of 5-V logic-high signals without damage or level-shifting components.
What is the thermal resistance (θJA) of SN74LVTH244APW in its TSSOP-20 package?
The published junction-to-ambient thermal resistance (θJA) for SN74LVTH244APW in the PW (TSSOP-20) package is 83°C/W, measured under JEDEC-standard conditions (2-layer board, 1-in² copper). This value governs thermal derating in standard PCB layouts and must be used for junction temperature calculations under worst-case load conditions.
How does the Ioff feature protect SN74LVTH244APW during hot insertion?
The Ioff circuitry in SN74LVTH244APW disables all outputs when VCC = 0 V, limiting current flow to ±100 µA regardless of applied input or output voltages (0–4.5 V). This prevents damaging backflow current from live backplane traces into a powered-down module, enabling true hot-swap capability without risk of latch-up or ESD damage.
SN74LVTH244APW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVTH
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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-TSSOP
SN74LVTH244APW FAQ
1.How can I place an order for SN74LVTH244APW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTH244APW 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 SN74LVTH244APW reliable?
The price and inventory of SN74LVTH244APW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH244APW is usually 5 days.
3.What payment methods are accepted for SN74LVTH244APW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVTH244APW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVTH244APW?
SN74LVTH244APW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVTH244APW 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 SN74LVTH244APW?
For technical support, including SN74LVTH244APW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH244APW requirements.
6.How does Aetrix verify that SN74LVTH244APW is sourced from the original manufacturer or authorized distributors?
All SN74LVTH244APW 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 SN74LVTH244APW meets industry standards.
7.What is the process for return or replacement of SN74LVTH244APW?
All SN74LVTH244APW units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH244APW, 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 SN74LVTH244APW part is unused and in its original packaging.
Return procedure for SN74LVTH244APW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74LVTH244APW 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…
