SN74LVT244APWR - 3.3V ABT Octal Buffer/Line Driver | TI
MPN: SN74LVT244APWR β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.75 | $0.75 |
| 10 | $0.62 | $6.20 |
| 100 | $0.45 | $45.00 |
| 500 | $0.36 | $180.00 |
| 1,000 | $0.29 | $290.00 |
SN74LVT244APWR Overview
A buffer and line driver is a digital logic IC that increases the drive current of a weak signal source so it can fan out to multiple loads or drive long bus lines. Within the semiconductor hierarchy, the SN74LVT244APWR belongs to the logic IC family, specifically buffers, drivers and receivers, under the broad category of integrated circuits. Line drivers sit between a microcontroller or FPGA bus and memory, peripherals, or backplanes, restoring signal integrity and isolating capacitive loading.
Key features include non-inverting 3-state outputs that enter high impedance when disabled, allowing multiple devices to share a common bus; separate OE control for each 4-bit element, enabling half-width bus operation; LVT-speed propagation delays suited for address/data buffering; and 5V-tolerant TTL-level input logic so a 3.3V device can interface with legacy 5V systems.
Technically, the ABT/LVT BiCMOS process combines the low static power of CMOS inputs with the high output drive of bipolar transistors, delivering strong sink and source current with fast edge rates while keeping supply current low in the static state.
Typical applications include 8-bit address/data bus buffering in embedded systems, memory interface isolation, backplane line driving in industrial control, and 3.3V-to-5V TTL signal translation in mixed-voltage designs.
Design consideration: tie unused OE inputs to VCC to guarantee outputs are enabled, and use short ground returns to limit ground bounce from fast bipolar output edges.
This page synthesizes distributor availability, drop-in alternatives, pinout, and practical design notes not consolidated in the manufacturer datasheet.
Drop-in alternatives for SN74LVT244APWR β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with SN74LVT244APWR (same form factor and footprint) β differing in Output Enable, Output Type, Package, Supply Voltage Range.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
SN74LVTH244APWR
β Drop-Inπ Reference alternative (not in catalog)
SN74LVC244APWR
β Drop-Inβ In Stock
$0.21 / Unit
View Datasheet βSN74LVCH244APWR
β Drop-Inπ Reference alternative (not in catalog)
SN74LV244APWR
β Drop-Inπ Reference alternative (not in catalog)
SN74HC244APWR
β Drop-Inπ Reference alternative (not in catalog)
74LVTH244MTC
β Drop-Inπ Reference alternative (not in catalog)
SN74LVT244APWR Maximum Ratings & Electrical Characteristics
| Logic Function | Octal buffer / line driver, non-inverting |
| Technology Family | LVT (ABT, 3.3V BiCMOS) |
| Supply Voltage Range | 2.7 V to 3.6 V |
| Input Type | TTL-compatible CMOS inputs |
| Output Type | 3-state, non-inverting |
| Channels | 8 (2 elements x 4 bit) |
| Output Enable | 2 separate active-low OE inputs |
| Features | Bus-hold capable family (per TI product page) |
| Package | 20-TSSOP (PW) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Pricing (1 pc) | See tiers; as of 2026-09-14 |
SN74LVT244APWR Pin Configuration
| Pin 1 | OE1 β Output-enable input 1 (active low) |
| Pin 2 | 1A1 β Data input, element 1 bit 1 |
| Pin 3 | 1Y1 β 3-state output, element 1 bit 1 |
| Pin 4 | 1A2 β Data input, element 1 bit 2 |
| Pin 5 | 1Y2 β 3-state output, element 1 bit 2 |
| Pin 6 | 1A3 β Data input, element 1 bit 3 |
| Pin 7 | 1Y3 β 3-state output, element 1 bit 3 |
| Pin 8 | 1A4 β Data input, element 1 bit 4 |
| Pin 9 | 1Y4 β 3-state output, element 1 bit 4 |
| Pin 10 | GND β Ground |
| Pin 11 | 2Y1 β 3-state output, element 2 bit 1 |
| Pin 12 | 2A1 β Data input, element 2 bit 1 |
| Pin 13 | 2Y2 β 3-state output, element 2 bit 2 |
| Pin 14 | 2A2 β Data input, element 2 bit 2 |
| Pin 15 | 2Y3 β 3-state output, element 2 bit 3 |
| Pin 16 | 2A3 β Data input, element 2 bit 3 |
| Pin 17 | 2Y4 β 3-state output, element 2 bit 4 |
| Pin 18 | 2A4 β Data input, element 2 bit 4 |
| Pin 19 | OE2 β Output-enable input 2 (active low) |
| Pin 20 | VCC β Power supply, 2.7V to 3.6V |
Typical Applications
SN74LVT244APWR is suitable for 6 applications: Microprocessor Address/Data Bus Buffering, Memory Interface Isolation, Industrial Control Backplane Line Driving, 3.3V to 5V TTL Signal Translation, Shared Peripheral Module Buses, LED Status and Display Segment Driving.
Microprocessor Address/Data Bus Buffering
The SN74LVT244APWR is a natural fit for 8-bit address or data bus buffering in 3.3V embedded systems because its ABT BiCMOS output stage provides strong sink and source drive that restores signal integrity on heavily loaded buses, while its two independent 4-bit elements each with a separate active-low output enable allow half-bus control for shared resources. In a typical layout the microcontroller bus drives the A inputs, and the regenerated Y outputs drive memory chips or peripheral devices. Because inputs are TTL-compatible at a 2.7V to 3.6V supply, the buffer also bridges legacy 5V TTL control signals into the 3.3V domain. The trade-off versus pure CMOS buffers is slightly higher static supply current, accepted in exchange for superior drive and edge quality on capacitive loads.
Recommended
Memory Interface Isolation
Flash, SRAM, and SDRAM buses place large capacitive loads on controller outputs; inserting the SN74LVT244APWR between controller and memory isolates that loading and preserves edge rates. The 3-state outputs are essential here: when OE is driven high, the buffer releases the bus so memory can drive the data lines during reads or so another master can take ownership. Operating from 2.7V to 3.6V matches standard 3.3V memory rails, and TTL-compatible thresholds tolerate slow or degraded input edges from long traces. Placing the buffer close to the controller with short ground returns minimizes ground bounce from the fast bipolar edges. Designers should verify propagation delay budgeting, since the buffer adds delay to both address and data paths in synchronous memory interfaces.
Recommended
Industrial Control Backplane Line Driving
Industrial PLC backplanes and I/O racks benefit from the SN74LVT244APWR's combination of robust bipolar drive, 3-state bus sharing, and TTL input compatibility, which tolerate the noisy, slow-edged signals common on field wiring interfaces. The two 4-bit elements with separate output enables allow one device to buffer two independent control groups, such as a 4-bit status output and a 4-bit command output, each gated by a different controller signal. The 2.7V to 3.6V supply range absorbs regulation variation on distributed 3.3V backplanes. Compared with the CMOS SN74LV244APWR, the LVT part sustains heavier fan-out per channel, an advantage when one buffer drives multiple slave cards. Recommended products include TI isolation and driver companions from the same logic family.
Recommended
3.3V to 5V TTL Signal Translation
Many legacy boards still mix 5V TTL subsystems with modern 3.3V controllers; the SN74LVT244APWR was designed specifically for this scenario, operating its core from a 2.7V to 3.6V supply while accepting TTL-level inputs that interface cleanly with 5V system environments, as documented in the FindIC product overview. Outputs driven from the 3.3V rail produce logic levels recognized as valid TTL HIGH, so a single device both buffers and logically translates the domain. Engineers must still confirm that no 5V source exceeds the recommended output voltage limits on the Y pins, using series resistors or a direction-controlled transceiver where 5V drive is present. This approach is lower cost and lower delay than dedicated level-shifter ICs in purely unidirectional paths.
Recommended
Shared Peripheral Module Buses
When several peripheral modules share one processor bus, the SN74LVT244APWR provides the arbitration-friendly 3-state outputs needed for bus mastership handoff: each card buffers its drive onto the common bus, and a controller disables a card's four outputs via OE before another card enables its own. The BiCMOS output drive keeps rise and fall times fast despite the distributed capacitance of a multidrop backplane, and TTL-compatible inputs remain reliable with varying drive strengths from different cards. The 2.7V to 3.6V operating range tolerates bus-supply sag under peak module load. Designers should enforce a one-hot enable scheme in firmware to prevent bus contention, since simultaneous enabled outputs cause crowbar currents that stress the device.
Recommended
LED Status and Display Segment Driving
Although intended as a line driver, the SN74LVT244APWR's bipolar output stage is well suited to driving LED status indicators and display segment lines from a 3.3V logic source, since it sinks and sources significantly more current than a standard CMOS gate output. The 3-state outputs let a supervisor disable all indicators during brownout or test modes, and the two independently enabled 4-bit banks allow separate control of, for example, four front-panel LEDs and four backlight segments. Series resistors sized to the LED forward current keep the output within recommended ratings, and the 2.7V to 3.6V supply accommodates battery-fed indicator rails. Thermal considerations are minor at indicator currents but should be checked for dense LED banks.
Recommended
Recommended Products Summary
Engineering reference data for SN74LVT244APWR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SN74LVTH244APWR | SN74LVC244APWR | SN74LVCH244APWR | SN74LV244APWR | 74LVTH244MTC |
|---|---|---|---|---|---|---|
| Package | TSSOP-20 (PW) | TSSOP-20 (PW) - same | TSSOP-20 (PW) - same | TSSOP-20 (PW) - same | TSSOP-20 (PW) - same | TSSOP-20 (MTC) - equivalent |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | onsemi (Fairchild) |
| Technology | LVT (ABT BiCMOS, 3.3V) | LVTH (ABT BiCMOS, 3.3V) | LVC (CMOS) | LVCH (CMOS + bus hold) | LV (CMOS) | LVTH (BiCMOS, 3.3V) |
| Supply Voltage | 2.7V to 3.6V | 2.7V to 3.6V | 1.65V to 3.6V | 2.3V to 3.6V | 2.3V to 3.6V | 2.7V to 3.6V |
| Input Thresholds | TTL-compatible (5V interfacing) | TTL-compatible | CMOS (VIH = 2V at 3.3V) | TTL-compatible with bus hold | CMOS | TTL-compatible |
| Outputs | 8 x non-inverting 3-state | 8 x non-inverting 3-state | 8 x non-inverting 3-state | 8 x non-inverting 3-state | 8 x non-inverting 3-state | 8 x non-inverting 3-state |
| RoHS Compliance | Compliant | Compliant | Compliant | Compliant | Compliant | Compliant |
| Sourcing Channel | Rochester Electronics (DigiKey) | TI primary (DigiKey, Mouser) | TI primary | TI primary | TI primary | onsemi channel |
Key Differentiators
- TTL-compatible input thresholds for 5V system interfacing (vs SN74LVC244APWR)
- Bipolar BiCMOS output drive (vs SN74LV244APWR)
- Actively manufactured primary-source equivalent (vs SN74LVTH244APWR)
Design Notes
Place a 0.1uF ceramic decoupling capacitor within 2 mm of the VCC pin (pin 20) and GND (pin 10). The bipolar output stage of LVT technology draws transient currents with fast edges, so add a 4.7uF bulk capacitor per eight buffers on shared supply planes. Route the GND return of driven loads back to pin 10 with short, wide traces to limit ground bounce, which on LVT parts can cause spurious output glitches on neighboring channels.
Never leave OE1 (pin 1) or OE2 (pin 19) floating; an undetermined enable state causes bus contention and excess current. Tie unused OE pins to GND (enabled) or VCC (disabled) with a 10k resistor. Also do not exceed the 3.6V supply maximum - 5V tolerance applies to TTL logic levels at the inputs, not to VCC or the outputs. Verify absolute-maximum output voltage limits before connecting the Y outputs to any 5V rail.
For bus lines longer than roughly 15 cm, add 22-33 ohm series resistors at the Y outputs to damp reflections caused by the fast bipolar edge rates of LVT technology. Where multiple drivers share a bus, enforce one-hot output-enable sequencing in firmware, allowing one transition period (high-Z to active) before the next driver enables, to prevent simultaneous-drive crowbar currents that stress the devices.
Compliance Information
RoHS compliance per distributor listings for TI 244-type logic in PW package. REACH and conflict-minerals status not stated in provided data; verify with TI quality portal.
