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Texas Instruments SN74AHCT244MPWREP
- Part No.:
- SN74AHCT244MPWREP
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHCT244MPWREP.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,622
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Product details
Overview
SN74AHCT244MPWREP from Texas Instruments is an octal noninverting buffer/driver with 3-state outputs, designed for bus-oriented receivers and transmitters in high-reliability systems. It operates from 4.5 V to 5.5 V, supports –55°C to 125°C extended temperature range, delivers ±8 mA output drive, and features TTL-compatible inputs for legacy interface compatibility in aerospace and defense data buses.
For engineers reviewing the SN74AHCT244MPWREP datasheet, SN74AHCT244MPWREP pinout, SN74AHCT244MPWREP application, or SN74AHCT244MPWREP equivalent, this page provides verified electrical parameters, TSSOP-20 package details, functional behavior under enable control, and validated alternatives for radiation-tolerant or extended-temperature logic interfacing.
Technical Context
The SN74AHCT244MPWREP implements two independent 4-bit noninverting buffers, each with dedicated output-enable (OE) control. Its EPIC™ CMOS process ensures latch-up immunity (>250 mA per JESD17) and robust ESD protection (>1000 V HBM, >200 V MM).
Input thresholds are fixed at VIH = 2 V (min) and VIL = 0.8 V (max), matching standard TTL voltage levels. Propagation delays range from 5.4 ns (A→Y, CL = 15 pF) to 9.5 ns (A→Y, CL = 50 pF), while enable/disable times (tPZH/tPLZ) span 5–13 ns depending on load capacitance and transition edge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures stable operation across industrial power rails with ±5% tolerance. |
| Operating Temperature | –55°C to 125°C - Qualified for extended-temperature environments including avionics and downhole electronics. |
| Output Drive | ±8 mA - Sufficient to drive 50-pF loads with ≤9.5 ns propagation delay, supporting high-speed bus loading. |
| Input Compatibility | TTL-voltage compatible - Accepts 0.8 V/2.0 V logic thresholds without level-shifting circuitry. |
| 3-State Leakage | ±0.25 µA max at 5.5 V - Minimizes bus contention current when outputs are disabled. |
| Propagation Delay | 5.4 ns min (A→Y, CL = 15 pF) - Enables timing-critical address/data buffering in real-time control systems. |
| Power Dissipation Cap | 8.2 pF - Predictable dynamic power consumption at 1 MHz, simplifying thermal estimation. |
Pinout & Package
TSSOP-20 package (PW), 6.5 mm × 4.4 mm body, 0.65 mm pitch, exposed pad not present, JEDEC MO-153 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE / 2OE | Active-low output-enable controls for first and second 4-bit sections; must be pulled high via resistor during power sequencing to ensure Hi-Z state. |
| 2–5, 11–14 | 1A1–1A4 / 2A1–2A4 | Noninverting input terminals for respective buffer sections; TTL-compatible voltage thresholds apply. |
| 18, 16, 14, 12 / 9, 7, 5, 3 | 1Y1–1Y4 / 2Y1–2Y4 | 3-state buffered outputs; high-impedance when OE is high; driven low/high when OE is low. |
| 10 | GND | Ground reference for all logic and output stages; requires low-inductance connection to minimize noise coupling. |
| 20 | VCC | Positive supply rail; decoupling capacitor (0.1 µF ceramic) required within 5 mm of pin for stable switching. |
Key Features
| Feature | Design Value |
|---|---|
| Extended Temperature Qualification | Tested per JEDEC standards including HAST, temperature cycling, and bond intermetallic life - validated for mission-critical deployment. |
| TTL Input Compatibility | VIH = 2 V (min), VIL = 0.8 V (max) - eliminates need for external level shifters when interfacing with legacy TTL logic families. |
| High-Reliability Process | EPIC™ (Enhanced-Performance Implanted CMOS) - provides latch-up immunity exceeding 250 mA and ESD protection >1000 V HBM. |
| Controlled Baseline Manufacturing | Single assembly/test site and single fabrication site - ensures consistent parametric performance and traceable pedigree across production lots. |
| 3-State Output Control | Dual independent OE pins allow selective enabling of either 4-bit section - enables flexible bus arbitration without additional logic. |
Applications
| Aerospace Data Bus Interface | Defense System Address Buffering |
|---|---|
Use Scenario: Isolating and driving bidirectional address/data lines between FPGA-based controllers and radiation-hardened memory modules in satellite payload subsystems. IC Role / Device Role / Timing Role: Octal noninverting buffer with 3-state outputs serves as a direction-controlled bus driver, synchronized to clock edges with sub-10 ns propagation delay. Use Value: Extended temperature rating (–55°C to 125°C) and enhanced DMS support ensure long-term availability and operational stability in orbital thermal cycles. | Use Scenario: Driving multiplexed address lines to SRAM and flash memory banks in tactical radio baseband processors operating in extreme environmental conditions. IC Role / Device Role / Timing Role: Dual 4-bit buffer section allows independent control of upper/lower address nibbles using separate OE signals for precise timing alignment. Use Value: TTL-compatible inputs eliminate level-shifter components, reducing BOM count and PCB area in SWaP-constrained embedded designs. |
| Avionics Sensor Hub Interface | Industrial PLC I/O Expansion |
Use Scenario: Interfacing discrete sensor status signals (e.g., pressure, temperature, position) to a central microcontroller unit in flight control computers. IC Role / Device Role / Timing Role: Signal conditioning and fan-out buffer that isolates MCU GPIOs from noisy analog sensor domains while maintaining logic-level integrity. Use Value: Low output leakage (±0.25 µA max) prevents false triggering on shared bus lines during sleep or reset states. | Use Scenario: Expanding digital input capability of programmable logic controllers by buffering field-side switch and relay feedback signals before digitization. IC Role / Device Role / Timing Role: Level-translating and noise-immune signal conditioner that accepts industrial 5 V TTL sources and drives isolated input capture registers. Use Value: Latch-up immunity >250 mA protects against transient-induced faults in electrically harsh factory-floor environments. |
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 |
|---|---|---|---|
| SN74AHCT244MDWREP | SOIC-20 package (DW), θJA = 58°C/W vs. 83°C/W for PW; identical electrical specs and temperature range. | Preferred where board space permits larger footprint and higher thermal conductivity is needed. | Select when thermal management prioritizes lower junction-to-ambient resistance over compact layout. |
| SN54AHCT244 | Military QML-38534 qualified; same pinout and logic function but with stricter screening, burn-in, and lot traceability requirements. | Required for DoD-specified hardware where MIL-PRF-38534 compliance is mandatory. | Choose only when contractual or program-level certification mandates QML-38534 sourcing. |
Compared with SN74AHCT244MDWREP and SN54AHCT244, the SN74AHCT244MPWREP offers identical logic functionality and extended temperature operation in a space-optimized TSSOP-20 package-ideal for SWaP-sensitive platforms where SOIC real estate or military screening overhead is unnecessary.
Availability
SN74AHCT244MPWREP is available at Aetrix Electronics and suitable for aerospace data bus interfaces, defense system address buffering, and avionics sensor hub interfacing requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SN74AHCT244MPWREP 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and aerospace markets.
The SN74AHCT244MPWREP belongs to TI's enhanced-performance logic family built on EPIC™ CMOS technology, engineered specifically for high-reliability, extended-temperature applications in mission-critical electronic systems.
FAQ
What is the maximum operating temperature range supported by the SN74AHCT244MPWREP?
The SN74AHCT244MPWREP is rated for continuous operation from –55°C to 125°C. This extended temperature range is achieved through JEDEC-qualified testing including HAST, temperature cycling, and electromigration analysis-making SN74AHCT244MPWREP suitable for deployment in avionics, downhole tools, and defense electronics where ambient extremes are routine.
Does the SN74AHCT244MPWREP require external pull-up resistors on its output-enable pins?
Yes, to guarantee high-impedance outputs during power-up or power-down sequences, both 1OE and 2OE pins of the SN74AHCT244MPWREP must be tied to VCC through external pull-up resistors. The minimum resistance value depends on the current-sinking capability of the driving source, but typical values range from 4.7 kΩ to 10 kΩ for robust noise margin and fast enable timing.
Is the SN74AHCT244MPWREP pin-compatible with standard commercial-grade SN74AHCT244 devices?
No-the SN74AHCT244MPWREP uses the TSSOP-20 (PW) package and shares pinout compatibility only with other TSSOP-20 variants like SN74AHCT244MPWRE. It is not pin-compatible with SOIC-20 versions such as SN74AHCT244MDWREP due to differing package dimensions and lead pitch, though logic function and terminal assignment are identical.
What is the output drive strength of the SN74AHCT244MPWREP at 5 V supply?
At VCC = 5 V, the SN74AHCT244MPWREP delivers ±8 mA output current per channel-verified under IOL = 8 mA (low-level) and IOH = –8 mA (high-level) test conditions. This drive strength supports reliable switching into 50-pF loads with propagation delays as low as 5.4 ns, meeting timing requirements for high-speed address and data bus applications.
How does the SN74AHCT244MPWREP handle unused inputs?
All unused inputs on the SN74AHCT244MPWREP must be held at a defined logic level-either VCC or GND-to prevent floating nodes that could cause excessive ICC current or erratic output behavior. TI recommends tying unused A-inputs directly to VCC or GND using short traces; leaving them unconnected violates recommended operating conditions and may compromise latch-up immunity or ESD robustness in the SN74AHCT244MPWREP.
SN74AHCT244MPWREP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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:
- 8mA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74AHCT244MPWREP FAQ
1.How can I place an order for SN74AHCT244MPWREP through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT244MPWREP 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 SN74AHCT244MPWREP reliable?
The price and inventory of SN74AHCT244MPWREP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT244MPWREP is usually 5 days.
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4.How is shipping managed for SN74AHCT244MPWREP?
SN74AHCT244MPWREP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT244MPWREP 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 SN74AHCT244MPWREP?
For technical support, including SN74AHCT244MPWREP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT244MPWREP requirements.
6.How does Aetrix verify that SN74AHCT244MPWREP is sourced from the original manufacturer or authorized distributors?
All SN74AHCT244MPWREP 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 SN74AHCT244MPWREP meets industry standards.
7.What is the process for return or replacement of SN74AHCT244MPWREP?
All SN74AHCT244MPWREP units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT244MPWREP, 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 SN74AHCT244MPWREP part is unused and in its original packaging.
Return procedure for SN74AHCT244MPWREP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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