My Inquiry
My Account
onsemi MC74VHCT244ADTR2
- Part No.:
- MC74VHCT244ADTR2
- Manufacturer:
- onsemi
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MC74VHCT244ADTR2.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,749
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MC74VHCT244ADTR2 from onsemi is an octal non-inverting 3-state buffer/line driver designed for TTL-to-CMOS level translation in bus interface applications. It operates at 4.5–5.5 V, features 8 µA max ICC, 7.5 ns typical propagation delay (VCC = 5 V, CL = 50 pF), and ±8 mA output drive capability. It is used in microprocessor address/data bus buffering and memory I/O expansion.
For engineers reviewing the MC74VHCT244ADTR2 datasheet, pinout, applications, or equivalent options, key selection criteria include 5 V TTL-compatible input thresholds, symmetrical output drive strength, low static current, and TSSOP-20 package compatibility with high-density PCB layouts.
Technical Context
The MC74VHCT244ADTR2 implements two independent 4-bit non-inverting buffers, each controlled by separate active-low output-enable (OE) inputs (1OE, 2OE). Its VHCT logic family ensures TTL-compatible input switching levels while delivering CMOS-level noise immunity and rail-to-rail output swing.
Each buffer section supports true 3-state outputs with high-impedance off-state leakage ≤ 5 µA (VCC = 5.5 V), and operates across industrial temperature range (−40 °C to +85 °C) with guaranteed AC timing performance at 5 V supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures robust operation across standard 5 V rail tolerances and brown-out resilience. |
| Input Threshold | VIL = 0.8 V, VIH = 2.0 V - Matches TTL logic levels for seamless interfacing with legacy microcontrollers and peripherals. |
| Propagation Delay | 7.5 ns (typ) at VCC = 5 V, CL = 50 pF - Enables reliable timing in 20+ MHz bus systems without added wait states. |
| Output Drive | ±8 mA (IOH/IO L) - Sufficient to drive 10 LSTTL loads or terminate stubs in point-to-point bus topologies. |
| Quiescent Current | 8 µA (max) at VCC = 5.5 V - Minimizes standby power in always-on control subsystems. |
| Operating Temp | −40 °C to +85 °C - Qualified for industrial and automotive under-hood auxiliary modules. |
Pinout & Package
TSSOP-20 (Thin Shrink Small Outline Package), 0.65 mm pitch, 6.5 mm × 4.4 mm body, thermally enhanced for surface-mount assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output enable controls first/second 4-bit buffer group independently. |
| 2–5, 14–17 | A1–A4, B1–B4 | Non-inverting input terminals for respective buffer channels. |
| 6–9, 10–13 | Y1–Y4, Y5–Y8 | 3-state buffered outputs; high-impedance when OE = HIGH. |
| 20, 10 | VCC, GND | Power and ground pins placed diagonally for decoupling capacitor placement near IC corners. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-Compatible Inputs | Guaranteed VIL ≤ 0.8 V and VIH ≥ 2.0 V enables direct connection to 5 V TTL outputs without level-shifting circuitry. |
| Low-Power CMOS Outputs | CMOS rail-to-rail swing with <8 µA ICC reduces system-level power budget in multi-buffered data paths. |
| Independent Output Enables | Two OE pins allow selective activation of upper/lower nibbles-critical for partial bus gating in memory-mapped I/O. |
| High Noise Immunity | Typical VNH/VNL > 1.2 V at VCC = 5 V ensures stable operation in electrically noisy industrial environments. |
Applications
| Microprocessor Bus Buffering | Memory I/O Expansion |
|---|---|
Use Scenario: Isolating and driving address/data lines between a 8051-based controller and external SRAM or flash memory. IC Role / Device Role / Timing Role: Bidirectional bus buffer providing signal integrity, fanout amplification, and timing isolation between master and peripheral. Use Value: Eliminates timing skew across 8-bit data lanes and prevents loading-induced clock jitter on shared address buses. | Use Scenario: Expanding GPIO count via parallel I/O port using external latch and MC74VHCT244ADTR2 as output driver. IC Role / Device Role / Timing Role: Unidirectional output driver enabling high-current sourcing/sinking for LED arrays or relay coils. Use Value: Delivers ±8 mA per channel-sufficient to directly drive 5 mm LEDs or small solenoids without external transistors. |
| Industrial PLC I/O Module | Automotive Body Control Unit |
Use Scenario: Interfacing FPGA-configured logic with 24 V digital field sensors via optocoupler-isolated inputs and buffered outputs. IC Role / Device Role / Timing Role: Level-translating buffer stage converting 3.3 V/5 V FPGA I/O to robust 5 V TTL-compatible signals for downstream isolation stages. Use Value: Maintains noise margin >1.2 V in EMI-prone factory floor environments with variable ground potentials. | Use Scenario: Driving multiplexed dashboard display segments and indicator lamps from a CAN-connected microcontroller. IC Role / Device Role / Timing Role: Output expander translating MCU GPIO to higher-current, glitch-free segment drivers with independent enable control. Use Value: Dual OE pins allow dynamic blanking of display sections during CAN message processing to reduce EMI bursts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT244PWR | Same logic function and DC specs; slightly longer tPD (8.5 ns typ); SOIC-20 vs TSSOP-20 package. | SOIC footprint requires larger PCB area; less suitable for space-constrained automotive modules. | Select when board layout already uses SOIC-20 and thermal dissipation is not limiting. |
| 74VHC244M | Lower drive (±4 mA), wider VCC range (2–5.5 V); no TTL-compatible input thresholds (VIH = 70% VCC). | Requires external level shifters for TTL sources; unsuitable for direct 5 V TTL interface without redesign. | Select only for mixed-voltage systems where 3.3 V logic coexists with 5 V peripherals and level translation is handled elsewhere. |
Compared with SN74HCT244PWR and 74VHC244M, the MC74VHCT244ADTR2 uniquely combines TTL-compatible inputs, ±8 mA drive, and TSSOP-20 packaging-making it optimal for compact, noise-immune 5 V bus interfaces where pin-for-pin replacement is not required but functional superiority in industrial timing margins is critical.
Availability
MC74VHCT244ADTR2 is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and embedded computing applications requiring stable component supply, long-term lifecycle support, and verified RoHS-compliant sourcing.
Supply support for MC74VHCT244ADTR2 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
onsemi is a global semiconductor leader delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and edge applications.
The MC74VHCT244ADTR2 belongs to onsemi's VHCT logic family-engineered specifically for high-speed, low-power 5 V TTL-to-CMOS interfacing in space-constrained industrial and automotive control modules.
FAQ
What is the maximum operating frequency supported by the MC74VHCT244ADTR2?
The MC74VHCT244ADTR2 does not specify a maximum clock frequency, as it is a combinational buffer-not a clocked device. Its usable data rate is determined by propagation delay (7.5 ns typical) and system setup/hold timing. In practice, it reliably supports bus data rates up to 20 MHz in well-terminated 50 pF load conditions. The MC74VHCT244ADTR2 maintains signal integrity without added latency in synchronous parallel interfaces.
Does the MC74VHCT244ADTR2 support hot insertion or live insertion?
No, the MC74VHCT244ADTR2 is not hot-plug rated. It lacks Ioff protection and bus-hold circuitry, so powering the device while VCC is at 0 V may cause latch-up or excessive current flow through input clamps. System-level hot-swap capability requires external protection circuitry. Always power VCC before applying input signals to the MC74VHCT244ADTR2.
Can the MC74VHCT244ADTR2 drive a 50 Ω transmission line directly?
No-the MC74VHCT244ADTR2 is not designed for 50 Ω line driving. Its ±8 mA output drive corresponds to ~625 Ω effective impedance at 5 V, making it suitable for unterminated or lightly loaded CMOS/TTL buses, not RF or high-speed serial links. For 50 Ω termination, use a dedicated line driver IC. The MC74VHCT244ADTR2 excels in short-board interconnects, not cable-driven signaling.
Is the MC74VHCT244ADTR2 pin-compatible with the 74LS244?
Yes-the MC74VHCT244ADTR2 is functionally and pinout-compatible with the 74LS244 in TSSOP-20, sharing identical pin assignments for inputs, outputs, OE, VCC, and GND. However, it replaces bipolar LS logic with CMOS VHCT technology, offering lower power, higher noise immunity, and rail-to-rail outputs-while maintaining full TTL-level input compatibility. The MC74VHCT244ADTR2 serves as a drop-in upgrade path.
What is the recommended bypass capacitor value for the MC74VHCT244ADTR2?
A 100 nF X7R ceramic capacitor placed within 3 mm of the VCC pin (Pin 20) and GND pin (Pin 10) is recommended for the MC74VHCT244ADTR2. This value effectively suppresses high-frequency switching noise generated during output transitions. For systems with multiple MC74VHCT244ADTR2 devices, add one 4.7 µF tantalum or polymer capacitor per 3–5 ICs on the same VCC rail to handle bulk decoupling.
MC74VHCT244ADTR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74VHCT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 8mA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
MC74VHCT244ADTR2 FAQ
1.How can I place an order for MC74VHCT244ADTR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74VHCT244ADTR2 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 MC74VHCT244ADTR2 reliable?
The price and inventory of MC74VHCT244ADTR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74VHCT244ADTR2 is usually 5 days.
3.What payment methods are accepted for MC74VHCT244ADTR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74VHCT244ADTR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74VHCT244ADTR2?
MC74VHCT244ADTR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74VHCT244ADTR2 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 MC74VHCT244ADTR2?
For technical support, including MC74VHCT244ADTR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74VHCT244ADTR2 requirements.
6.How does Aetrix verify that MC74VHCT244ADTR2 is sourced from the original manufacturer or authorized distributors?
All MC74VHCT244ADTR2 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 MC74VHCT244ADTR2 meets industry standards.
7.What is the process for return or replacement of MC74VHCT244ADTR2?
All MC74VHCT244ADTR2 units undergo pre-shipment inspection (PSI). If there is an issue with MC74VHCT244ADTR2, 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 MC74VHCT244ADTR2 part is unused and in its original packaging.
Return procedure for MC74VHCT244ADTR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MC74VHCT244ADTR2 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
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
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…
