My Inquiry
My Account
onsemi MC74ACT244MG
- Part No.:
- MC74ACT244MG
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
MC74ACT244MG.pdf
- Description:
- IC BUFF NON-INVERT 5.5V SOEIAJ20
- Quantity:
- Payment:
- Shipping:
Inventory:1,937
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MC74ACT244MG from onsemi is an octal 3-state buffer/line driver with TTL-compatible inputs, designed for memory address driving, clock distribution, and bidirectional bus interfacing in industrial control and embedded systems. It operates at 4.5 V to 5.5 V, delivers ±24 mA output drive, supports −40°C to +85°C ambient, and features low propagation delay (max 10.0 ns at 5 V).
For engineers reviewing the MC74ACT244MG datasheet, pinout, applications, or equivalent options, this page provides verified functional identity, SOIC-20W package mapping, truth-table–validated 3-state control logic, and direct alternative part comparisons for bus interface design and legacy TTL-level system upgrades.
Technical Context
The MC74ACT244MG implements two independent 4-bit non-inverting buffers, each controlled by a dedicated 3-state enable (OE1/OE2). Its TTL-compatible inputs accept 0.8 V (VIL) and 2.0 V (VIH) thresholds at 5 V supply, enabling direct interfacing with legacy 5 V TTL logic without level translation.
Each output drives ±24 mA under guaranteed conditions, with VOH ≥ 4.4 V and VOL ≤ 0.44 V at IOL = 24 mA. Propagation delays (tPLH/tPHL) are specified up to 10.0 ns, and 3-state enable/disable times (tPZH/tPLZ) are ≤ 10.5 ns - critical for high-speed bus arbitration and synchronous data latching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL and CMOS systems without regulation overhead |
| Output Drive | ±24 mA - sufficient to directly drive multiple 5 V TTL loads or terminate unterminated stubs on medium-length PCB traces |
| Propagation Delay | Max 10.0 ns at 5 V, CL = 50 pF - enables reliable operation in 50 MHz bus cycles with timing margin |
| 3-State Enable Time | Max 9.5 ns (tPZH) - supports fast bus turnaround in half-duplex communication protocols |
| Input Thresholds | VIL = 0.8 V, VIH = 2.0 V - guarantees noise immunity and interoperability with 74LS, 74F, and other TTL families |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded controllers and motor drive interfaces |
| Package | SOIC-20W (Case 751D) - surface-mount footprint compatible with automated assembly and IPC-7351B land patterns |
Pinout & Package
MC74ACT244MG is housed in a 20-lead SOIC wide-body (SOIC-20W, Case 751D) package with 1.27 mm pitch, 7.5 mm body width, and Pb-free finish (G suffix). Pin 1 is top-left corner (notch-down orientation), with VCC at Pin 20 and GND at Pin 10.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Inputs A1–A4 / B1–B4 | Non-inverting data inputs for two independent 4-bit channels; accept TTL-compatible logic levels |
| 11, 13, 15, 17, 18, 19, 2, 4 | Outputs Y1–Y4 / Z1–Z4 | Active-high buffered outputs; high-impedance when respective OE is HIGH |
| 9, 12, 14, 16 | Outputs Y1–Y4 | First 4-bit channel outputs, enabled by OE1 (Pin 1) |
| 11, 13, 15, 17 | Outputs Z1–Z4 | Second 4-bit channel outputs, enabled by OE2 (Pin 19) |
| 1, 19 | OE1 / OE2 | Active-low 3-state enables - LOW enables corresponding 4-bit output group; HIGH forces high-impedance |
| 10 | GND | Ground reference for all input/output signals and internal logic |
| 20 | VCC | Positive supply rail (4.5–5.5 V); decoupling capacitor required within 10 mm of this pin |
Key Features
| Feature | Design Value |
|---|---|
| TTL-Compatible Inputs | VIH = 2.0 V, VIL = 0.8 V at VCC = 5 V - eliminates need for external level shifters when interfacing with legacy 74LS or 74F devices |
| High-Drive 3-State Outputs | ±24 mA sink/source capability - supports fan-out to 10+ standard TTL loads or direct connection to unterminated 50 Ω transmission lines |
| Low Propagation Delay | tPLH/tPHL ≤ 10.0 ns - enables use in 50 MHz address/data buses with setup/hold margin for FPGA or microcontroller interfaces |
| Independent Dual Enable Control | Separate OE1 (Pin 1) and OE2 (Pin 19) - allows time-multiplexed or isolated control of two 4-bit data paths on shared bus segments |
| Pb-Free SOIC-20W Package | RoHS-compliant, moisture sensitivity level 1 - supports lead-free reflow profiles and long-term supply chain sustainability requirements |
Applications
| Industrial PLC Backplane Interface | Legacy Microprocessor Address Buffering |
|---|---|
Use Scenario: Isolating and driving 16-bit address/data multiplexed buses between CPU and I/O modules in programmable logic controllers. IC Role / Device Role / Timing Role: Octal buffer providing level-shifting and current gain for address latching, with dual OE pins enabling per-module bus arbitration. Use Value: Eliminates signal integrity issues caused by capacitive loading across 200 mm backplane traces while maintaining TTL-compatible timing margins. |
Use Scenario: Buffering 8-bit address lines from Z80 or 8085 CPUs to peripheral decoders and memory chips in retro-computing or test equipment designs. IC Role / Device Role / Timing Role: Non-inverting line driver with 3-state control synchronized to CPU RD/WR strobes for clean bus release during DMA cycles. Use Value: Ensures stable address hold time and prevents bus contention during interrupt-driven context switches without external glue logic. |
| Automotive ECU Diagnostic Port Interface | Test Equipment Signal Conditioning |
Use Scenario: Level-translating and buffering ISO 9141-2 K-line signals between microcontroller UART peripherals and vehicle diagnostic connectors. IC Role / Device Role / Timing Role: Bidirectional bus transceiver configured as open-drain-compatible driver using 3-state control and pull-up resistors. Use Value: Provides robust 5 V logic drive into 52 Ω K-line impedance while meeting automotive EMC requirements via controlled edge rates. |
Use Scenario: Driving multiple DUT inputs simultaneously from a single pattern generator channel in automated test fixtures. IC Role / Device Role / Timing Role: Fan-out buffer distributing synchronized digital stimulus with matched propagation delay across all eight outputs. Use Value: Reduces skew-induced timing errors in parallel test vectors, improving pass/fail repeatability for IC functional validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT244N | Dual OE pins, same 4.5–5.5 V range and ±24 mA drive, but PDIP-20 package (through-hole) | Suitable for prototyping or legacy through-hole PCBs; lacks SOIC thermal performance and density | Select when manual soldering or socket-based debugging is required; not drop-in for SOIC footprints |
| 74LVX244M | Lower voltage operation (2.0–3.6 V), reduced drive (±12 mA), different input thresholds (VIH = 1.7 V) | Designed for 3.3 V mixed-signal systems; incompatible with 5 V TTL signaling without level translation | Choose only for new 3.3 V designs where power efficiency outweighs legacy interface needs |
Compared with SN74ACT244N and 74LVX244M, the MC74ACT244MG uniquely combines 5 V TTL interoperability, SOIC-20W surface-mount reliability, and industrial temperature range - making it the preferred choice for upgrading legacy 5 V control systems without board redesign.
Availability
MC74ACT244MG is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive diagnostic interfaces, and legacy microprocessor address buffering requiring stable component supply and long-term obsolescence management.
Supply support for MC74ACT244MG 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 (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, logic, and discrete components for automotive, industrial, and cloud infrastructure markets.
The MC74ACT244MG belongs to onsemi's legacy 74ACT logic family, engineered specifically for robust 5 V TTL-to-CMOS interfacing in mission-critical industrial control and automotive subsystems where reliability and backward compatibility are essential.
FAQ
What is the maximum operating supply voltage for MC74ACT244MG?
The MC74ACT244MG has an absolute maximum VCC rating of +6.5 V, but its recommended operating range is strictly 4.5 V to 5.5 V. Operation outside this window risks violating input threshold specifications and may cause unreliable 3-state behavior or increased ICC. The MC74ACT244MG must be powered within 4.5–5.5 V to guarantee TTL-compatible input recognition and ±24 mA output drive performance.
Does MC74ACT244MG support hot insertion or live bus swapping?
No, the MC74ACT244MG does not include hot-swap protection circuitry such as power-on reset, undervoltage lockout, or slew-rate controlled outputs. Its inputs and outputs are not designed to tolerate voltage transients during live insertion. To implement safe bus swapping, external series resistors and clamping diodes must be added per I/O line, and OE control must be sequenced before VCC ramp-up. The MC74ACT244MG itself requires stable VCC and controlled enable sequencing.
Can MC74ACT244MG drive a 50 Ω transmission line directly?
Yes - the MC74ACT244MG can drive a 50 Ω load with acceptable signal integrity when terminated properly. At IOL = 24 mA and VOL ≤ 0.44 V, it achieves ~2.2 V swing into 50 Ω (V = I × R = 0.024 × 50 = 1.2 V), which meets TTL logic thresholds. For clean edges, use series source termination near the MC74ACT244MG output and ensure trace impedance matches. Do not use parallel termination at the load unless additional current budget is available.
What is the function of Pins 1 and 19 on MC74ACT244MG?
Pins 1 and 19 are active-low 3-state enable inputs: OE1 (Pin 1) controls outputs Y1–Y4 (Pins 18, 16, 14, 12), and OE2 (Pin 19) controls outputs Z1–Z4 (Pins 17, 15, 13, 11). When either OE is LOW, its associated four outputs drive actively; when HIGH, those outputs enter high-impedance state. This dual-enable architecture allows independent gating of two 4-bit data groups on a shared bus - a key feature of the MC74ACT244MG.
Is MC74ACT244MG pin-compatible with MC74AC244MG?
Yes - the MC74ACT244MG and MC74AC244MG share identical pinout, package (SOIC-20W), and functional block diagram. However, they differ electrically: MC74ACT244MG has TTL-compatible inputs (VIH = 2.0 V), while MC74AC244MG uses CMOS thresholds (VIH = 3.85 V at 5 V). Substituting one for the other without verifying input drive strength and logic family compatibility may result in marginal or failed switching. The MC74ACT244MG is not a drop-in replacement unless the upstream driver is confirmed TTL-compatible.
MC74ACT244MG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ACT
- Package/Case:
- 20-SOIC (0.209", 5.30mm 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:
- 24mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOEIAJ-20
MC74ACT244MG FAQ
1.How can I place an order for MC74ACT244MG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74ACT244MG 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 MC74ACT244MG reliable?
The price and inventory of MC74ACT244MG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74ACT244MG is usually 5 days.
3.What payment methods are accepted for MC74ACT244MG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74ACT244MG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74ACT244MG?
MC74ACT244MG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74ACT244MG 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 MC74ACT244MG?
For technical support, including MC74ACT244MG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74ACT244MG requirements.
6.How does Aetrix verify that MC74ACT244MG is sourced from the original manufacturer or authorized distributors?
All MC74ACT244MG 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 MC74ACT244MG meets industry standards.
7.What is the process for return or replacement of MC74ACT244MG?
All MC74ACT244MG units undergo pre-shipment inspection (PSI). If there is an issue with MC74ACT244MG, 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 MC74ACT244MG part is unused and in its original packaging.
Return procedure for MC74ACT244MG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MC74ACT244MG 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…
