My Inquiry
My Account
onsemi MC74HCT244AFELG
- Part No.:
- MC74HCT244AFELG
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
MC74HCT244AFELG.pdf
- Description:
- IC BUF NON-INVERT 5.5V SOEIAJ-20
- Quantity:
- Payment:
- Shipping:
Inventory:2,870
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MC74HCT244AFELG from onsemi is an octal 3-state noninverting buffer/line driver/line receiver with LSTTL-compatible inputs, designed for bus-oriented systems including memory address drivers and clock distribution. It operates from 4.5 V to 5.5 V, supports –55°C to +125°C industrial temperature range, provides 15 LSTTL load drive capability, and features two active-low output enables (Enable A and Enable B).
For engineers reviewing the MC74HCT244AFELG datasheet, pinout, applications, or equivalent options, key selection considerations include its dual 4-bit channel architecture, TTL/NMOS input compatibility, high-impedance outputs during disable, propagation delay ≤30 ns at 125°C, and SOIC-20W/TSSOP-20 package options.
Technical Context
The MC74HCT244AFELG implements eight independent noninverting buffers grouped into two 4-bit banks (A1–A4 / B1–B4), each controlled by a dedicated active-low enable (Enable A, Enable B). Its inputs accept standard LSTTL voltage thresholds (VIH = 2.0 V min, VIL = 0.8 V max) while outputs swing rail-to-rail (VOH ≥ 4.4 V, VOL ≤ 0.1 V at 4.5 V) under 6 mA load.
It uses high-performance silicon-gate CMOS technology with 112 FETs (28 equivalent gates), complies with JEDEC Std No. 7A, and integrates input protection against static discharge. The device functions as a level translator between TTL/NMOS logic and CMOS buses without external biasing or pull-ups.
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 |
| Propagation Delay | ≤30 ns (max, 125°C) - enables reliable operation in high-speed bus timing with >16 MHz toggle rate |
| Output Drive | 15 LSTTL loads - supports direct fanout to legacy TTL devices without buffering |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - guarantees robust noise margin and interoperability with 5 V TTL/NMOS outputs |
| Operating Temp | –55°C to +125°C - qualified for extended industrial and automotive under-hood environments |
| Quiescent ICC | ≤160 µA (max, 125°C) - minimizes standby power in always-on control subsystems |
| 3-State Leakage | ±10 µA (max, 125°C) - prevents signal corruption when outputs are disabled on shared buses |
Pinout & Package
MC74HCT244AFELG is packaged in SOIC-20W (Case 751D) with 20-pin surface-mount footprint and gull-wing leads. Pin 1 is marked via microdot or notch; Pin 10 = GND, Pin 20 = VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | Enable A / Enable B | Active-low controls for Bank A (pins 2–5, 18–15) and Bank B (pins 14–11, 9–6) |
| 2–5, 18–15 | A1–A4 / YA1–YA4 | Noninverting data path: A1→YA1, A2→YA2, etc.; outputs high-impedance when Enable A = HIGH |
| 14–11, 9–6 | B1–B4 / YB1–YB4 | Noninverting data path: B1→YB1, B2→YB2, etc.; outputs high-impedance when Enable B = HIGH |
| 10 | GND | Reference ground for all I/O and supply terminals; must be low-inductance connection |
| 20 | VCC | +5 V supply input; requires local 0.1 µF ceramic decoupling adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| LSTTL-Compatible Inputs | Accepts standard 5 V TTL logic levels without level-shifting circuitry or external resistors |
| Dual Independent Enables | Allows selective activation of two 4-bit data groups-enabling partial bus isolation and power gating |
| Rail-to-Rail CMOS Outputs | VOH ≥ 4.4 V and VOL ≤ 0.1 V at 4.5 V supply ensure full logic swing into CMOS/NMOS loads |
| High-Speed Propagation | 30 ns max delay at 125°C supports real-time control loops and synchronous bus protocols |
| Pb-Free & RoHS Compliant | Meets global environmental regulations; compatible with lead-free reflow profiles (260°C peak) |
Applications
| Industrial PLC Backplane Interface | Automotive Body Control Module |
|---|---|
Use Scenario: Interfacing microcontroller GPIOs to legacy 5 V TTL peripheral cards across a modular backplane. IC Role / Device Role / Timing Role: Bidirectional level-translating buffer isolating MCU I/O from noisy backplane signals while preserving timing integrity. Use Value: Eliminates need for discrete level shifters; dual enables allow dynamic segmentation of address/data lines during hot-swap events. | Use Scenario: Driving multiple solenoid control lines from a central body controller ASIC in door module assemblies. IC Role / Device Role / Timing Role: High-current line driver providing 15 LSTTL load drive per output to interface with electromechanical actuators. Use Value: Ensures clean signal edges (<18 ns transition time) for precise PWM timing and reduces EMI through controlled slew rates. |
| Medical Diagnostic Equipment Bus Arbiter | Test & Measurement Instrumentation |
Use Scenario: Managing shared address/data bus access among FPGA, ADC, and DAC modules in portable ultrasound units. IC Role / Device Role / Timing Role: 3-state bus transceiver enabling time-multiplexed resource sharing without contention. Use Value: Low 3-state leakage (±10 µA max) prevents false triggering during idle periods; wide temp range ensures reliability in clinical environments. | Use Scenario: Isolating DUT signals from test head logic in automated boundary-scan testers. IC Role / Device Role / Timing Role: Noninverting buffer with fast enable/disable (39 ns max OE→Z) for precise signal gating during test vector application. Use Value: Sub-30 ns propagation delay maintains nanosecond-level timing accuracy required for IEEE 1149.1 compliance verification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal noninverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT244N | Dual active-low enables; identical AC/DC specs; PDIP-20 package only | Lacks SOIC/TSSOP variants; unsuitable for space-constrained PCB layouts | Select when through-hole assembly or legacy DIP sockets are required |
| 74HCT244PW | Same logic function; TSSOP-20 package; guaranteed 125°C operation not explicitly stated | Lower thermal rating may limit use in under-hood automotive zones | Prefer for cost-sensitive consumer-grade designs where extended temp is not critical |
Compared with SN74HCT244N and 74HCT244PW, the MC74HCT244AFELG offers verified –55°C to +125°C operation, Pb-free SOIC-20W packaging, and explicit AEC-Q100 qualification support-making it the preferred choice for industrial control and automotive body electronics requiring long-term reliability and traceable sourcing.
Availability
MC74HCT244AFELG is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, and medical diagnostic equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MC74HCT244AFELG 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MC74HCT244AFELG belongs to onsemi's HCT logic family, engineered for seamless interoperability between TTL, NMOS, and CMOS systems in harsh-environment embedded control applications.
FAQ
What is the maximum operating temperature for MC74HCT244AFELG?
The MC74HCT244AFELG is rated for continuous operation from –55°C to +125°C across all package types. This specification is validated per JEDEC Std No. 7A and confirmed in the device's Recommended Operating Conditions table. The MC74HCT244AFELG maintains full DC and AC performance within this range, making it suitable for under-hood automotive and industrial control applications where ambient temperatures exceed 105°C.
Does MC74HCT244AFELG support 3.3 V logic interfaces?
No, the MC74HCT244AFELG is designed exclusively for 5 V operation with a supply range of 4.5 V to 5.5 V. Its LSTTL-compatible inputs require VIH ≥ 2.0 V and VIL ≤ 0.8 V, but it does not guarantee correct operation with 3.3 V CMOS outputs due to insufficient noise margin and undefined behavior below 4.5 V supply. For mixed-voltage systems, use dedicated level translators or 3.3 V–compatible HCT variants such as MC74VHC244.
How many output enable signals does MC74HCT244AFELG have?
The MC74HCT244AFELG has two independent active-low output enable signals: Enable A (pin 1) controls YA1–YA4, and Enable B (pin 19) controls YB1–YB4. Each enable places its respective 4-bit bank into high-impedance state when driven HIGH. This dual-enable architecture allows granular bus segmentation and power management not possible with single-enable octal buffers like the MC74HCT240A.
Is MC74HCT244AFELG pin-compatible with the LS244?
Yes, the MC74HCT244AFELG is explicitly designed as a drop-in replacement for the 74LS244, sharing identical pinout, logic function, and DC electrical characteristics. This compatibility is stated in the datasheet's first paragraph and verified across all 20 pins-including VCC (pin 20), GND (pin 10), and dual enable placement. No PCB layout changes are required when upgrading from LS244 to MC74HCT244AFELG.
What is the typical power dissipation of MC74HCT244AFELG at 5 V?
The typical power dissipation of MC74HCT244AFELG at 5 V is calculated using CPD = 55 pF (per enabled output) and quiescent ICC ≈ 4 µA. Under no-load conditions with all outputs enabled and toggling at 1 MHz, total dynamic power is ~1.4 mW per output. With all eight outputs active, total typical dissipation remains below 15 mW-well within the SOIC-20W package's 500 mW rating at 25°C ambient.
MC74HCT244AFELG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74HCT
- Package/Case:
- 20-SOIC (0.209", 5.30mm 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:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOEIAJ-20
MC74HCT244AFELG FAQ
1.How can I place an order for MC74HCT244AFELG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74HCT244AFELG 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 MC74HCT244AFELG reliable?
The price and inventory of MC74HCT244AFELG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74HCT244AFELG is usually 5 days.
3.What payment methods are accepted for MC74HCT244AFELG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74HCT244AFELG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74HCT244AFELG?
MC74HCT244AFELG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74HCT244AFELG 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 MC74HCT244AFELG?
For technical support, including MC74HCT244AFELG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74HCT244AFELG requirements.
6.How does Aetrix verify that MC74HCT244AFELG is sourced from the original manufacturer or authorized distributors?
All MC74HCT244AFELG 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 MC74HCT244AFELG meets industry standards.
7.What is the process for return or replacement of MC74HCT244AFELG?
All MC74HCT244AFELG units undergo pre-shipment inspection (PSI). If there is an issue with MC74HCT244AFELG, 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 MC74HCT244AFELG part is unused and in its original packaging.
Return procedure for MC74HCT244AFELG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MC74HCT244AFELG 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…
