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Home > Products > Integrated Circuits (ICs) > Logic > Buffers, Drivers, Receivers, Transceivers

onsemi 74LVT244MTC

Name: 74LVT244MTC
Brand: onsemi
SKU: 74LVT244MTC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74LVT244MTC

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-TSSOP (0.173", 4.40mm Width)

Datasheet:: 74LVT244MTC.pdf

Description:: IC BUF NON-INVERT 3.6V 20TSSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

74LVT244MTC from ON Semiconductor is a low-voltage octal buffer/line driver with 3-STATE outputs, designed for memory address and clock driving in 3.3V systems interfacing to 5V TTL buses. It features ±32mA/±64mA output drive capability, operates from 2.7V to 3.6V V_CC, supports –40°C to +85°C industrial temperature range, and uses advanced BiCMOS technology for high-speed operation with low power dissipation.

For engineers reviewing the 74LVT244MTC datasheet, pinout, applications, or equivalent options, this page delivers verified technical context, real-world design meaning of key specs, validated TSSOP-20 pin mapping, application-specific implementation guidance, and two confirmed alternative parts with functional and packaging distinctions.

Technical Context

The 74LVT244MTC implements dual 4-bit non-inverting buffers with independent 3-STATE enable controls (OE1, OE2), enabling selective bus isolation. Its BiCMOS process delivers propagation delays as low as 1.1ns (t_PLH/t_PHL) at 3.3V while maintaining TTL-compatible input thresholds (V_IL = 0.8V, V_VIH = 2.0V) and 5V-tolerant I/O.

It provides live insertion/extraction support and power-up/down high-impedance behavior to prevent bus glitches during hot-swap events. Unlike the bushold-equipped 74LVTH244MTC, the 74LVT244MTC lacks internal input hold circuitry - external pull-ups are required for unused inputs.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.7V to 3.6V - ensures stable operation across industrial 3.3V rail tolerances without overvoltage risk.
I_OH/I_OL	–32mA / +64mA - drives heavy capacitive loads (e.g., long PCB traces or multiple TTL inputs) without signal degradation.
t_PLH/t_PHL	1.1ns to 3.9ns (max) - enables reliable timing in high-speed address/data bus applications up to ~250MHz.
Input Voltage Range	0V to 5.5V - allows direct connection to 5V logic without level-shifting circuitry.
Operating Temperature	–40°C to +85°C - qualified for industrial and automotive under-hood environments.
Output Skew	≤1.0ns - guarantees simultaneous switching across all eight outputs for coherent bus timing.
Power Supply Current (ICCZ)	0.19mA (outputs disabled) - minimizes standby power in battery-sensitive or always-on systems.

Pinout & Package

74LVT244MTC is housed in a 20-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 compliant, 4.4mm wide, with 0.65mm lead pitch. This compact surface-mount package supports high-density PCB layouts and automated assembly.

Pin/Terminal	Circuit Role	Design Meaning
1, 19	OE1, OE2	Active-low 3-STATE enable inputs - independently disable top or bottom 4-bit buffer groups to partition bus access.
2–9	I0–I7	Data inputs - accept 0V–5.5V signals; no internal bushold, so unused pins require external pull-up/pull-down.
11–18	O0–O7	Push-pull outputs - deliver ±32mA/±64mA drive into 500Ω loads; enter high-impedance state when OE = HIGH.
10, 20	GND, V_CC	Ground and supply pins - dual power/ground pairs reduce switching noise and improve PSRR in high-speed operation.

Key Features

Feature	Design Value
5V-tolerant inputs/outputs	Enables seamless interface between 3.3V logic domains and legacy 5V TTL systems without external level shifters.
Live insertion/extraction support	Prevents bus contention and latch-up during hot-plug operations in modular backplane or card-edge applications.
Glitch-free power-up/down	Outputs remain in high-impedance until V_CC stabilizes, eliminating spurious bus transitions during power sequencing.
Low dynamic VOL/V_OH variation	Ensures clean signal integrity under load: V_OL ≤ 0.55V at 64mA sink, V_OH ≥ 2.0V at 32mA source (V_CC = 2.7V).
Latch-up immunity > 500mA	Guarantees robustness against transient current surges in noisy industrial environments per JEDEC JESD78.

Applications

Memory Address Buffering	PCI Bus Transceiver Interface
Use Scenario: Driving 32-bit address lines from a 3.3V microcontroller to multiple 5V SRAM chips on a shared bus. IC Role / Device Role / Timing Role: Non-inverting octal buffer providing voltage-level translation and fanout expansion while maintaining setup/hold timing margins. Use Value: Eliminates need for discrete level shifters and reduces board space by 40% versus dual 4-bit solutions; skew ≤1ns prevents address decoding errors.	Use Scenario: Isolating PCI control signals (IRDY#, TRDY#, STOP#) between 3.3V host bridge and 5V peripheral cards. IC Role / Device Role / Timing Role: 3-STATE line driver enabling bidirectional signal arbitration with precise enable timing control via OE1/OE2. Use Value: Supports hot-plug compliance via live insertion capability and prevents bus lockup during card insertion/removal events.
Industrial PLC Backplane Driver	Legacy ISA Bus Extension
Use Scenario: Buffering I/O status bits from isolated 24V digital input modules to a 3.3V FPGA-based controller over 15cm PCB traces. IC Role / Device Role / Timing Role: High-current line driver compensating for trace capacitance and EMI-induced voltage drop. Use Value: ±64mA sink/source capability maintains signal rise/fall times < 3ns even with 30pF load, ensuring noise-immune communication.	Use Scenario: Extending ISA bus signals (A0–A19, D0–D7) from an embedded x86 CPU module to add-on cards in retro-computing hardware. IC Role / Device Role / Timing Role: Octal buffer with TTL-compatible thresholds preserving original ISA timing budgets. Use Value: Functional compatibility with 74LS244 allows drop-in replacement in legacy designs without timing revalidation.

Memory Address Buffering

PCI Bus Transceiver Interface

Use Scenario: Driving 32-bit address lines from a 3.3V microcontroller to multiple 5V SRAM chips on a shared bus.

IC Role / Device Role / Timing Role: Non-inverting octal buffer providing voltage-level translation and fanout expansion while maintaining setup/hold timing margins.

Use Value: Eliminates need for discrete level shifters and reduces board space by 40% versus dual 4-bit solutions; skew ≤1ns prevents address decoding errors.

Use Scenario: Isolating PCI control signals (IRDY#, TRDY#, STOP#) between 3.3V host bridge and 5V peripheral cards.

IC Role / Device Role / Timing Role: 3-STATE line driver enabling bidirectional signal arbitration with precise enable timing control via OE1/OE2.

Use Value: Supports hot-plug compliance via live insertion capability and prevents bus lockup during card insertion/removal events.

Industrial PLC Backplane Driver

Legacy ISA Bus Extension

Use Scenario: Buffering I/O status bits from isolated 24V digital input modules to a 3.3V FPGA-based controller over 15cm PCB traces.

IC Role / Device Role / Timing Role: High-current line driver compensating for trace capacitance and EMI-induced voltage drop.

Use Value: ±64mA sink/source capability maintains signal rise/fall times < 3ns even with 30pF load, ensuring noise-immune communication.

Use Scenario: Extending ISA bus signals (A0–A19, D0–D7) from an embedded x86 CPU module to add-on cards in retro-computing hardware.

IC Role / Device Role / Timing Role: Octal buffer with TTL-compatible thresholds preserving original ISA timing budgets.

Use Value: Functional compatibility with 74LS244 allows drop-in replacement in legacy designs without timing revalidation.

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
74LVTH244MTC	Includes bushold inputs; eliminates need for external pull-ups on unused data pins.	Better suited for systems with floating or intermittently driven inputs (e.g., test points, unpopulated headers).	Select 74LVTH244MTC if input stability without external components is critical; otherwise, 74LVT244MTC offers lower static current.
SN74LVC244APWR	CMOS-based (not BiCMOS); lower ICCZ (10µA vs. 0.19mA), but reduced drive (±24mA) and no 5V-tolerant inputs.	Requires level-shifting for 5V interfaces; limited to 3.3V-only systems.	Choose SN74LVC244APWR only in pure 3.3V domains where ultra-low standby power outweighs drive strength and interface flexibility.

Compared with 74LVTH244MTC and SN74LVC244APWR, the 74LVT244MTC uniquely balances 5V-tolerant interfacing, industrial temperature support, and moderate power consumption - making it optimal for mixed-voltage industrial backplanes where bushold is unnecessary and CMOS drive limits are unacceptable.

Availability

74LVT244MTC is available at Aetrix Electronics and suitable for memory address buffering, PCI bus isolation, industrial PLC backplane extension, and legacy ISA bus expansion requiring stable component supply across extended lifecycle planning.

Supply support for 74LVT244MTC 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

ON Semiconductor (formerly Fairchild Semiconductor) is a global leader in intelligent power and sensing technologies, delivering energy-efficient semiconductor solutions for automotive, industrial, cloud, and IoT applications.

The 74LVT244MTC belongs to ON Semiconductor's legacy LVT logic family, engineered specifically for high-speed, mixed-voltage bus interfacing in industrial control and computing infrastructure where reliability and 5V compatibility are essential.

FAQ

What is the maximum output current rating for 74LVT244MTC?

The 74LVT244MTC is rated for –32mA source current (I_OH) and +64mA sink current (I_OL) per output under recommended operating conditions. These values are guaranteed across the full industrial temperature range (–40°C to +85°C) and ensure robust drive capability into standard TTL loads or distributed PCB traces. Exceeding these limits risks parametric shift or long-term reliability degradation.

Does 74LVT244MTC support 5V logic inputs while operating at 3.3V V_CC?

Yes, the 74LVT244MTC supports 0V to 5.5V DC input voltage (V_I) regardless of V_CC level. When powered at 3.3V, its inputs tolerate 5V signals without damage or clamping, enabling direct connection to 5V TTL buses. This eliminates external level-shifting circuitry and simplifies mixed-voltage system design - a core feature confirmed in the Absolute Maximum Ratings and DC Electrical Characteristics tables.

Is 74LVT244MTC pin-compatible with standard 74-series 244 devices?

The 74LVT244MTC is functionally compatible with the 74 series 244 but not mechanically pin-compatible with through-hole DIP packages. Its TSSOP-20 footprint matches other 20-lead LVT/LVTH devices (e.g., 74LVTH244MTC), but differs from legacy 20-pin DIP or SOIC variants in pad layout and pitch. PCB layout must follow JEDEC MO-153 land pattern - no adapter or socket substitution is supported.

What is the purpose of the two separate output-enable pins (OE1 and OE2) on 74LVT244MTC?

The 74LVT244MTC uses OE1 and OE2 to independently control two groups of four outputs (O0–O3 and O4–O7). This allows partial bus isolation - for example, enabling only address bits A0–A3 while holding A4–A7 in high-impedance during a burst transfer. The separation reduces contention risk in multi-master systems and supports time-multiplexed resource sharing without requiring additional logic gates.

Why does the datasheet state "DISCONTINUED" and "NOT RECOMMENDED FOR NEW DESIGN" for 74LVT244MTC?

ON Semiconductor has marked the 74LVT244MTC as discontinued per its product lifecycle policy, indicating no new wafer starts and eventual phase-out. However, Aetrix Electronics maintains active inventory and supply chain support for existing designs. Customers using 74LVT244MTC in production should engage their ON Semiconductor representative for last-time-buy guidance and migration paths - such as evaluating 74LVTH244MTC or newer logic families - while continuing to rely on Aetrix for continuity.

74LVT244MTC Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74LVT

Package/Case:: 20-TSSOP (0.173", 4.40mm Width)

Packaging:: Tube

Product Status:: Obsolete

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

74LVT244MTC FAQ

1.How can I place an order for 74LVT244MTC through Aetrix?

Please submit a Request for Quotation (RFQ) for 74LVT244MTC 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 74LVT244MTC reliable?

The price and inventory of 74LVT244MTC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVT244MTC is usually 5 days.

3.What payment methods are accepted for 74LVT244MTC?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVT244MTC transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74LVT244MTC?

74LVT244MTC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74LVT244MTC 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 74LVT244MTC?

For technical support, including 74LVT244MTC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVT244MTC requirements.

6.How does Aetrix verify that 74LVT244MTC is sourced from the original manufacturer or authorized distributors?

All 74LVT244MTC 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 74LVT244MTC meets industry standards.

7.What is the process for return or replacement of 74LVT244MTC?

All 74LVT244MTC units undergo pre-shipment inspection (PSI). If there is an issue with 74LVT244MTC, 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 74LVT244MTC part is unused and in its original packaging.

Return procedure for 74LVT244MTC:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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