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Texas Instruments SN74ACT244MNSREP
- Part No.:
- SN74ACT244MNSREP
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74ACT244MNSREP.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,450
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Product details
Overview
SN74ACT244MNSREP from Texas Instruments is an octal noninverting buffer/driver with 3-state outputs, designed for memory address driving, clock distribution, and bus interfacing in high-reliability industrial systems. It operates from 4.5 V to 5.5 V, supports –55°C to 125°C ambient temperature, delivers ≤9.5 ns propagation delay at 5 V, and provides ±24 mA output drive per channel.
For engineers reviewing the SN74ACT244MNSREP datasheet, SN74ACT244MNSREP pinout, SN74ACT244MNSREP application, or SN74ACT244MNSREP equivalent, key selection factors include its extended-temperature SOP (NS) package, TTL-compatible inputs, rail-to-rail output voltage swing, and dual independent 4-bit 3-state control architecture.
Technical Context
The SN74ACT244MNSREP implements two independent 4-bit noninverting buffers, each with dedicated output-enable (1OE, 2OE) inputs controlling high-impedance states. Its ACT logic family ensures TTL-level input compatibility while maintaining CMOS-level noise immunity and output drive strength.
Each output transitions between active low-impedance states (VOH ≥ 3.7 V, VOL ≤ 0.5 V at 24 mA) and fully isolated high-Z mode (IOZ ≤ ±5 µA), enabling bidirectional bus sharing without contention. Input transition rate tolerance of 8 ns/V supports clean signal integrity across noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures stable operation across industrial power rails with ±10% tolerance. |
| Operating Temp | –55°C to 125°C - Qualified for extended-temperature applications including avionics and downhole equipment. |
| tpd Max | 9.5 ns at 5 V - Enables timing-critical address/data buffering in 100+ MHz bus systems. |
| IOL / IOH | ±24 mA per output - Drives standard TTL loads or multiple CMOS inputs without external buffering. |
| Input Compatibility | TTL-level - Accepts 0.8 V/2.0 V thresholds directly from legacy logic families without level shifters. |
| 3-State Leakage | ±5 µA max (IOZ) - Minimizes bus leakage current during high-Z mode, critical for low-power standby states. |
| CI / CO | 2.5 pF / 8 pF - Low input and output capacitance reduces switching noise and improves signal edge fidelity. |
Pinout & Package
SOP-20 (NS package), 7.6 mm × 12.6 mm body, 1.27 mm pitch, 2.65 mm max height, RoHS-compliant NIPDAU lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE | Output Enable (Group 1) | Active-low control for Y1–Y4 outputs; ties to VCC via pullup for safe power-up high-Z state. |
| 2OE | Output Enable (Group 2) | Independent active-low control for Y1–Y4 of second buffer group; enables split-bus isolation. |
| 1A1–1A4 | Input (Group 1) | Noninverting data inputs for first 4-bit buffer; TTL-compatible, accept up to 5.5 V. |
| 2A1–2A4 | Input (Group 2) | Noninverting data inputs for second 4-bit buffer; electrically isolated from Group 1. |
| 1Y1–1Y4 | Output (Group 1) | 3-state buffered outputs mirroring 1A1–1A4; high-Z when 1OE = high. |
| 2Y1–2Y4 | Output (Group 2) | 3-state buffered outputs mirroring 2A1–2A4; high-Z when 2OE = high. |
| VCC | Supply | 5-V nominal supply; decoupling required within 10 mm for noise-sensitive bus applications. |
| GND | Ground | Common reference for all I/O and supply; requires low-inductance connection to minimize ground bounce. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit groups | Enables selective enable/disable of two separate bus segments without shared control timing constraints. |
| Extended temperature qualification | Validated per JEDEC HAST, temperature cycling, and intermetallic life testing for –55°C to 125°C operation. |
| TTL-compatible inputs | Accepts standard 0.8 V/2.0 V logic thresholds-eliminates need for level translation in mixed-family systems. |
| Low-output leakage in 3-state | IOZ ≤ ±5 µA ensures minimal bus loading during high-Z, preserving signal integrity on shared lines. |
| Controlled baseline manufacturing | Single assembly/test site and single fabrication site ensure consistent parametric performance across production lots. |
Applications
| Memory Address Buffering | Clock Distribution |
|---|---|
Use Scenario: Driving address lines from a microcontroller to multiple SRAM or Flash devices on a shared bus. IC Role / Device Role: Noninverting 3-state buffer isolating CPU address outputs from memory subsystem loading. Use Value: Prevents address bus contention during memory access arbitration; supports hot-swap memory module insertion. | Use Scenario: Distributing a system clock signal to multiple synchronous peripherals with matched trace lengths. IC Role / Device Role: Low-skew, high-drive clock fanout buffer with independent enable control per group. Use Value: Maintains <9.5 ns inter-channel skew and drives >10 TTL loads without waveform degradation. |
| Industrial Bus Interface | Legacy System Interfacing |
Use Scenario: Isolating PLC I/O modules from a central backplane bus operating under EMI-heavy factory conditions. IC Role / Device Role: Robust 3-state bus transceiver supporting bidirectional data flow with fast enable/disable. Use Value: Withstands –55°C to 125°C ambient and rejects >8 ns/V input transients-reducing bus lockup events. | Use Scenario: Connecting modern FPGA-based controllers to legacy TTL-based instrumentation panels. IC Role / Device Role: Level-tolerant interface bridge accepting 5.5 V-tolerant inputs and delivering full-rail CMOS outputs. Use Value: Eliminates external level shifters; preserves timing margins with sub-10 ns propagation delay. |
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 |
|---|---|---|---|
| SN74ACT244MDWREP | Same electrical specs but SOIC (DW) package; 10.63 mm × 7.6 mm, 2.65 mm height, 1.27 mm pitch. | Requires PCB layout change due to different footprint and thermal pad absence; higher θJA (58°C/W vs 60°C/W). | Select when existing DW-layout boards require drop-in replacement or tighter board space constraints apply. |
| SN74ACT244I-EP (e.g., SN74ACT244IDWREP) | Identical function and pinout; rated for –40°C to 85°C only; lower cost and wider commercial availability. | Not qualified for extended-temperature industrial or aerospace use; lacks HAST/temperature cycle validation. | Select for commercial-grade systems where ambient stays within –40°C to 85°C and enhanced reliability testing is unnecessary. |
Compared with SN74ACT244MDWREP and SN74ACT244I-EP, the SN74ACT244MNSREP uniquely combines SOP-20 mechanical compatibility with full military-grade extended-temperature qualification, making it the only option for new designs requiring both compact packaging and –55°C to 125°C operation.
Availability
SN74ACT244MNSREP is available at Aetrix Electronics and suitable for industrial control systems, avionics data buses, and downhole telemetry equipment requiring stable component supply across extreme temperature ranges and long product lifecycles.
Supply support for SN74ACT244MNSREP 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and high-reliability logic solutions for industrial, automotive, and aerospace markets.
The SN74ACT244-EP product line delivers radiation-tolerant, extended-temperature octal buffers optimized for mission-critical bus interfacing, memory expansion, and clock distribution in harsh-environment electronics.
FAQ
What is the maximum operating temperature range for SN74ACT244MNSREP?
The SN74ACT244MNSREP is rated for continuous operation from –55°C to 125°C ambient temperature. This extended range is validated per JEDEC standards including HAST, temperature cycling, and intermetallic life testing-making SN74ACT244MNSREP suitable for avionics, oilfield tools, and industrial control cabinets exposed to extreme thermal stress.
Does SN74ACT244MNSREP support 3.3-V logic inputs?
No, SN74ACT244MNSREP does not guarantee reliable operation with 3.3-V logic inputs. Its input thresholds are TTL-compatible (VIL = 0.8 V, VIH = 2.0 V), and it requires VCC = 4.5–5.5 V. While inputs tolerate up to 5.5 V, they are not designed for 3.3-V signaling; using SN74ACT244MNSREP with 3.3-V drivers risks marginal VIH margin and increased static power consumption.
Can SN74ACT244MNSREP replace SN74ACT244IDWREP in an existing design?
SN74ACT244MNSREP cannot be used as a direct PCB replacement for SN74ACT244IDWREP due to differing packages: NS (SOP-20) vs DW (SOIC-20). Though pinout and function are identical, the NS package has smaller body dimensions (7.6 mm × 12.6 mm vs 7.4 mm × 12.6 mm) and different land pattern requirements. Layout redesign is required to accommodate SN74ACT244MNSREP.
What is the recommended pullup resistor value for OE pins on SN74ACT244MNSREP?
Texas Instruments recommends tying OE pins to VCC through a pullup resistor to ensure high-impedance state during power-up. The minimum resistor value depends on the driver's current-sinking capability; for typical applications, a 4.7-kΩ resistor provides sufficient noise immunity while limiting current to <1 mA. Lower values (e.g., 1 kΩ) may be used if faster enable timing is needed, provided the driving source can sink the resulting current.
Is SN74ACT244MNSREP compliant with RoHS and REACH regulations?
Yes, SN74ACT244MNSREP is RoHS-compliant (lead-free) with NIPDAU lead finish and meets REACH SVHC requirements. Its packaging documentation confirms "Yes" for RoHS status, Level-1 MSL rating, and compliance with EU Directive 2011/65/EU. Full material declarations and substance reports are available through TI's official product page and environmental compliance portal.
SN74ACT244MNSREP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
SN74ACT244MNSREP FAQ
1.How can I place an order for SN74ACT244MNSREP through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT244MNSREP 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 SN74ACT244MNSREP reliable?
The price and inventory of SN74ACT244MNSREP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT244MNSREP is usually 5 days.
3.What payment methods are accepted for SN74ACT244MNSREP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT244MNSREP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT244MNSREP?
SN74ACT244MNSREP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT244MNSREP 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 SN74ACT244MNSREP?
For technical support, including SN74ACT244MNSREP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT244MNSREP requirements.
6.How does Aetrix verify that SN74ACT244MNSREP is sourced from the original manufacturer or authorized distributors?
All SN74ACT244MNSREP 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 SN74ACT244MNSREP meets industry standards.
7.What is the process for return or replacement of SN74ACT244MNSREP?
All SN74ACT244MNSREP units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT244MNSREP, 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 SN74ACT244MNSREP part is unused and in its original packaging.
Return procedure for SN74ACT244MNSREP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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