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Texas Instruments SN74AHC244MDWREP
- Part No.:
- SN74AHC244MDWREP
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AHC244MDWREP.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,405
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Product details
Overview
SN74AHC244MDWREP from Texas Instruments is a radiation-hardened, high-reliability octal buffer/driver with 3-state outputs, designed for space-grade and extended-temperature embedded systems. It operates from 2 V to 5.5 V, supports –55°C to 125°C operation, delivers ±8 mA output drive at 5 V, and features dual independent 4-bit channels each controlled by separate OE inputs - used in spacecraft data bus isolation and avionics address buffering.
For engineers reviewing the SN74AHC244MDWREP datasheet, SN74AHC244MDWREP pinout, SN74AHC244MDWREP application, or SN74AHC244MDWREP equivalent, this page provides verified electrical specs, thermal limits, switching timing under 15 pF/50 pF loads, 3-state enable behavior, and qualified alternatives for harsh-environment design validation.
Technical Context
The SN74AHC244MDWREP implements two independent 4-bit noninverting buffer/driver sections (1A→1Y and 2A→2Y), each with dedicated output-enable (OE) control. Its EPIC™ CMOS process ensures latch-up immunity (>250 mA per JESD17) and robust ESD protection (1500 V HBM, 150 V MM).
It supports true 3-state output behavior: when OE is low, A inputs pass through to Y outputs; when OE is high, all eight Y outputs enter high-impedance state. Power-up/down safety requires OE tied to VCC via pullup resistor to prevent bus contention during supply ramp.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - enables interoperability across 2.5 V, 3.3 V, and 5 V logic domains without level shifters |
| Operating Temperature | –55°C to 125°C - qualified per JEDEC extended-temperature standards including HAST, temperature cycling, and bond intermetallic life testing |
| Output Drive | ±8 mA at 5 V - sufficient to drive 50-pF bus loads with <6.5 ns propagation delay (tPLH/tPHL) |
| 3-State Enable Delay | tPZH/tPZL = 4.7–8.5 ns (15 pF), tPHZ/tPLZ = 5–8.5 ns (15 pF) - ensures deterministic bus release timing in time-critical control paths |
| Input Thresholds | VIH = 3.85 V, VIL = 1.65 V at VCC = 5.5 V - provides >1.3 V noise margin against rail-to-rail interference in noisy aerospace environments |
| Quiescent Current | ICC ≤ 40 µA max at 5.5 V - supports low-power standby modes in battery-backed or power-gated subsystems |
| Thermal Resistance | θJA = 58°C/W (SOIC-DW) - enables reliable operation at full rating without forced airflow in sealed enclosures |
Pinout & Package
SN74AHC244MDWREP uses a 20-pin SOIC (DW) package with 0.300-inch body width, RoHS-compliant NiPdAu lead finish, and moisture sensitivity level 1 (260°C peak reflow). Pin 1 orientation follows quadrant Q1 per tape-and-reel specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE / 2OE | Active-low output-enable inputs - independently disable Group 1 (pins 2–9) or Group 2 (pins 11–18) outputs to high-impedance state |
| 2, 4, 6, 8 | 1A1–1A4 | Group 1 input signals - routed to corresponding Y outputs only when 1OE = low |
| 11, 13, 15, 17 | 2A1–2A4 | Group 2 input signals - routed to corresponding Y outputs only when 2OE = low |
| 18, 16, 14, 12 | 1Y1–1Y4 | Group 1 buffered noninverting outputs - high-impedance when 1OE = high |
| 9, 7, 5, 3 | 2Y1–2Y4 | Group 2 buffered noninverting outputs - high-impedance when 2OE = high |
| 10 | GND | Ground reference - must be connected to system ground plane with low-inductance path to minimize switching noise |
| 20 | VCC | Supply voltage - requires local 0.1 µF ceramic decoupling capacitor placed within 5 mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit buffers | Enables selective isolation of two separate data paths (e.g., CPU address bus and peripheral I/O bus) using separate OE controls |
| Extended temperature qualification | Validated for continuous operation from –55°C to 125°C per MIL-STD-883 and JESD22 methods, including biased 85/85 and thermal cycling |
| High noise immunity | Input thresholds scale with VCC and provide ≥1.3 V DC noise margin at 5.5 V, critical for EMI-prone launch and orbital environments |
| Low dynamic power | Cpd = 8.6 pF at 5 V - reduces switching current and heat generation in dense PCB layouts with multiple parallel drivers |
| Controlled baseline manufacturing | Single assembly/test site and single fabrication site ensure consistent parametric distribution and long-term supply continuity for mission-critical programs |
Applications
| Spacecraft Onboard Data Handling | Avionics Sensor Interface Hub |
|---|---|
Use Scenario: Isolating processor address/data buses from radiation-sensitive memory modules during fault recovery sequences. IC Role / Device Role / Timing Role: Octal 3-state buffer providing bidirectional bus separation with sub-10 ns enable/disable timing to prevent metastability during hot-swap events. Use Value: Prevents bus contention during partial reconfiguration; dual OE pins allow staggered enable sequencing to reduce simultaneous switching noise (SSN). |
Use Scenario: Aggregating analog sensor outputs (via ADCs) into a centralized ARINC 429 or MIL-STD-1553 interface controller. IC Role / Device Role / Timing Role: Level-shifting and fan-out buffer between mixed-voltage sensor front-ends (2.5 V/3.3 V) and 5 V bus transceivers. Use Value: 2–5.5 V VCC range eliminates need for external level translators; ±8 mA drive sustains signal integrity over 15 cm backplane traces. |
| Defense Radar Signal Processing Backplane | Satellite Payload Power Management Unit |
Use Scenario: Driving FPGA configuration address lines and flash memory control signals in high-vibration radar subsystems. IC Role / Device Role / Timing Role: Noninverting buffer with guaranteed timing across –55°C to 125°C, enabling deterministic boot sequence execution under thermal shock. Use Value: Propagation delay variation ≤1.5 ns over full temperature range ensures setup/hold compliance for 100 MHz FPGA clocks. |
Use Scenario: Enabling/disabling telemetry data paths between payload instruments and downlink modems during solar array deployment. IC Role / Device Role / Timing Role: Bus isolator activated by watchdog-controlled OE signals to enforce fail-safe communication blackouts during mechanical actuation. Use Value: High-impedance leakage <±2.5 µA guarantees zero current path between isolated domains, preserving battery charge during multi-hour deployment windows. |
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 |
|---|---|---|---|
| SN74AHC244MPWREP | TSSOP-20 package (83°C/W θJA), same electrical specs and temp range | Better PCB area efficiency but higher thermal resistance - requires enhanced copper pour or airflow in high-power density designs | Select when board space is constrained and thermal management can be augmented; not drop-in due to different footprint and solder profile |
| SN54AHC244 | Military QML-38534 Class V qualified, identical SOIC-DW package, same pinout and timing | Approved for DoD defense platforms requiring formal QML certification and traceable lot documentation | Choose for U.S. Department of Defense contracts where QML pedigree is mandatory; otherwise SN74AHC244MDWREP offers equivalent performance with broader commercial support |
Compared with SN74AHC244MPWREP, SN74AHC244MDWREP offers lower thermal resistance and proven reliability in hermetically sealed modules; compared with SN54AHC244, it shares identical functionality but targets NASA and commercial space programs where EPIC™ process validation replaces formal QML documentation requirements.
Availability
SN74AHC244MDWREP is available at Aetrix Electronics and suitable for spacecraft onboard computers, avionics sensor hubs, and defense radar backplanes requiring stable component supply across extended temperature and radiation-tolerant operating conditions.
Supply support for SN74AHC244MDWREP 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 aerospace, defense, and industrial markets.
The SN74AHC244MDWREP belongs to TI's Enhanced-Performance Implanted CMOS (EPIC™) logic family, engineered specifically for mission-critical systems demanding extended temperature operation, latch-up immunity, and long-term supply assurance.
FAQ
What is the maximum clock frequency supported by SN74AHC244MDWREP?
The SN74AHC244MDWREP is not a clocked device and has no internal clock; it is a combinatorial buffer with propagation delays specified at 3.9–6.5 ns (VCC = 5 V, CL = 15 pF). Its usable data rate depends on system-level timing margins - typically supports clean signal transmission up to 100 MHz bus frequencies when paired with appropriate trace impedance and termination. The SN74AHC244MDWREP does not impose a hard clock limit but relies on external timing control of its OE and input signals.
Does SN74AHC244MDWREP require external pull-up resistors on OE pins?
Yes - to ensure outputs remain in high-impedance state during power-up or brownout, OE pins must be tied to VCC via external pull-up resistors. The minimum resistor value depends on the current-sinking capability of the driving source; TI recommends ≥10 kΩ for typical microcontroller GPIOs. This prevents undefined output states that could cause bus contention or excessive current draw before firmware initializes the SN74AHC244MDWREP control logic.
Can SN74AHC244MDWREP drive 50-pF loads reliably across its full temperature range?
Yes - the SN74AHC244MDWREP is characterized for 50-pF loads at both 3.3 V and 5 V supply voltages across –55°C to 125°C. At VCC = 5 V, tPLH/tPHL is 5.4–7.5 ns (min/max) and tPZH/tPZL is 6.2–9.3 ns, with VOL ≤ 0.5 V and VOH ≥ 3.94 V under worst-case conditions. These parameters guarantee signal integrity for standard PCB trace capacitances found in aerospace backplanes and avionics modules.
Is SN74AHC244MDWREP pin-compatible with commercial SN74AHC244 variants?
Yes - SN74AHC244MDWREP shares identical pinout, electrical behavior, and SOIC-DW package dimensions with commercial SN74AHC244 devices. However, it is not a drop-in replacement in functional safety or radiation-tolerant contexts unless the target application explicitly permits EP-rated components; its enhanced qualification (HAST, 85/85, thermal cycling) exceeds standard commercial requirements.
What is the meaning of "EP" suffix in SN74AHC244MDWREP?
The "EP" suffix denotes Texas Instruments' Enhanced Product line: a controlled-baseline, extended-temperature (–55°C to 125°C), and DMS-supported version built on the EPIC™ process. For SN74AHC244MDWREP, EP signifies qualification to JEDEC JESD47 stress tests, enhanced traceability, single-fab/single-test-site manufacturing, and 10-year product continuity commitment - distinct from catalog (SN74AHC244) or automotive (SN74AHC244-Q1) variants.
SN74AHC244MDWREP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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:
- 2V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74AHC244MDWREP FAQ
1.How can I place an order for SN74AHC244MDWREP through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC244MDWREP 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 SN74AHC244MDWREP reliable?
The price and inventory of SN74AHC244MDWREP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC244MDWREP is usually 5 days.
3.What payment methods are accepted for SN74AHC244MDWREP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHC244MDWREP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHC244MDWREP?
SN74AHC244MDWREP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC244MDWREP 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 SN74AHC244MDWREP?
For technical support, including SN74AHC244MDWREP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC244MDWREP requirements.
6.How does Aetrix verify that SN74AHC244MDWREP is sourced from the original manufacturer or authorized distributors?
All SN74AHC244MDWREP 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 SN74AHC244MDWREP meets industry standards.
7.What is the process for return or replacement of SN74AHC244MDWREP?
All SN74AHC244MDWREP units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC244MDWREP, 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 SN74AHC244MDWREP part is unused and in its original packaging.
Return procedure for SN74AHC244MDWREP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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