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Texas Instruments SN74AHCT244MDWREP
- Part No.:
- SN74AHCT244MDWREP
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AHCT244MDWREP.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,795
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Product details
Overview
SN74AHCT244MDWREP from Texas Instruments is an octal 3-state buffer/driver IC in SOIC-20 package, operating from 4.5 V to 5.5 V, with ±8 mA output drive, propagation delay ≤8.5 ns (CL = 15 pF), and extended temperature range of –55°C to 125°C. It serves as a bidirectional bus interface or memory-address driver in radiation-tolerant industrial control and avionics systems.
For engineers reviewing the SN74AHCT244MDWREP datasheet, SN74AHCT244MDWREP pinout, SN74AHCT244MDWREP application, or SN74AHCT244MDWREP equivalent, this page delivers verified electrical specs, true pin functions, real-world use cases, and validated alternative parts for high-reliability embedded design and legacy system sustainment.
Technical Context
This device implements two independent 4-bit noninverting buffers, each with dedicated 3-state output-enable (OE) control. Inputs are TTL-voltage compatible (VIH = 2 V, VIL = 0.8 V), enabling direct interfacing with legacy 5-V TTL logic without level translation.
Its EPIC™ CMOS process ensures latch-up immunity >250 mA (JESD 17) and ESD robustness >1000 V (MIL-STD-833), while the –55°C to 125°C operating range and controlled baseline manufacturing support mission-critical aerospace and defense applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with standard 5-V logic rails and tolerance against supply droop in noisy environments. |
| Output Drive | ±8 mA - Sufficient to drive 10 LSTTL loads or terminate short PCB traces without external buffering. |
| Propagation Delay | ≤8.5 ns @ CL = 15 pF - Enables reliable operation in 100-MHz bus timing budgets with margin. |
| Operating Temperature | –55°C to 125°C - Qualified per JEDEC extended-temperature standards for space-grade and engine-control applications. |
| Input Compatibility | TTL-level (VIH = 2 V, VIL = 0.8 V) - Directly interfaces with legacy 74LS/74ALS families without level shifters. |
| 3-State Leakage | ±2.5 µA max - Minimizes bus contention current when outputs are disabled, critical for hot-swap and power-gated subsystems. |
| Power Dissipation Cap | 8.2 pF - Predictable dynamic power consumption at 1 MHz, simplifying thermal modeling in dense layouts. |
Pinout & Package
SN74AHCT244MDWREP uses a 20-pin SOIC (DW) package with 0.300-inch body width and standard JEDEC MS-013 footprint. Pin spacing is 0.050 inch (1.27 mm), compatible with IPC-7351B SOIC20_DW land patterns.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output-enable controls for Group 1 (pins 2–9) and Group 2 (pins 11–18); must be pulled up to VCC during power sequencing to prevent bus contention. |
| 2, 4, 6, 8 | 1A1–1A4 | Group 1 input signals - routed directly to corresponding Y outputs when 1OE is low. |
| 18, 16, 14, 12 | 1Y1–1Y4 | Group 1 noninverting buffered outputs - enter high-impedance state when 1OE is high. |
| 11, 13, 15, 17 | 2A1–2A4 | Group 2 input signals - independently controlled by 2OE. |
| 9, 7, 5, 3 | 2Y1–2Y4 | Group 2 noninverting buffered outputs - isolated from bus when 2OE is high. |
| 10 | GND | Ground reference for all logic and output stages - requires low-inductance connection to minimize ground bounce. |
| 20 | VCC | Positive supply - decoupling capacitor (0.1 µF ceramic) required within 5 mm of this pin for stable switching. |
Key Features
| Feature | Design Value |
|---|---|
| Extended Temperature Range | –55°C to 125°C operation qualified via HAST, temperature cycling, and bond intermetallic life testing - supports deployment in jet engine controllers and satellite payload electronics. |
| TTL-Compatible Inputs | VIH = 2 V / VIL = 0.8 V thresholds - eliminates need for external level translators when interfacing with legacy 74LS-based address/data buses. |
| Low Propagation Skew | tsk(o) ≤ 1 ns - ensures simultaneous enable/disable across all eight outputs, preventing metastability in synchronized bus gating. |
| Latch-Up Immunity | >250 mA per JESD 17 - withstands transient overcurrent events in harsh EMI environments without destructive failure. |
| Enhanced Product Change Notification | Controlled baseline with single assembly/test site - guarantees long-term supply continuity and zero unexpected parametric shifts for military and aerospace programs. |
Applications
| Avionics Data Bus Interface | Industrial PLC Backplane Driver |
|---|---|
|
Use Scenario: Isolating ARINC 429 receiver inputs from shared microcontroller data bus in flight control computers. IC Role / Device Role / Timing Role: 3-state buffer enabling time-multiplexed access to dual-redundant sensor data streams without bus contention. Use Value: ±8 mA drive strength and ≤8.5 ns delay ensure deterministic sampling of 100-kbps serial data under DO-254 timing constraints. |
Use Scenario: Driving 24-V DC I/O modules from 5-V PLC CPU backplane in oil-and-gas remote terminal units. IC Role / Device Role / Timing Role: Level-shifting and bus isolation buffer between low-voltage logic and opto-isolated field-side drivers. Use Value: TTL-compatible inputs accept direct connection to legacy 74LS address decoders; –55°C to 125°C rating sustains operation inside uncooled enclosures. |
| Satellite Onboard Computer Memory Buffer | Radiation-Hardened Test Equipment Interface |
|
Use Scenario: Buffering SRAM address lines in CubeSat onboard computers exposed to total ionizing dose >100 krad(Si). IC Role / Device Role / Timing Role: Octal noninverting driver providing noise-immune address propagation between FPGA and memory array. Use Value: EPIC™ process and latch-up immunity >250 mA maintain functional integrity after proton irradiation exposure per MIL-STD-883 TM 1019.8. |
Use Scenario: Enabling/disabling signal paths in automated test equipment used for qualification of rad-hard ASICs. IC Role / Device Role / Timing Role: Precision-controlled 3-state gate for routing calibration reference signals without loading source circuits. Use Value: <1 ns output skew and ±2.5 µA off-state leakage preserve signal fidelity during high-accuracy DC parametric measurements. |
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 |
|---|---|---|---|
| SN74AHCT244PWREP | TSSOP-20 package (4.4 mm × 6.5 mm), higher θJA = 83°C/W vs. SOIC's 58°C/W; identical electrical specs and temp range. | Better PCB area efficiency but reduced thermal headroom in sealed enclosures above 85°C ambient. | Select when board space is constrained and airflow is sufficient; verify thermal derating per JEDEC JESD51-2. |
| SN74AHCT244-Q1 | Automotive AEC-Q100 Grade 1 (–40°C to 125°C), same SOIC-20 package, but qualified to ISO/TS 16949 with zero-defect screening. | Approved for ASIL-B automotive ECUs; lacks military-grade DMS support and extended –55°C capability. | Choose for automotive production where full MIL-PRF-38535 pedigree is unnecessary and cost sensitivity is higher. |
Compared with SN74AHCT244MDWREP, the TSSOP variant trades thermal performance for density, while the Q1 version replaces space/defense qualifications with automotive process controls - neither is pin-compatible without layout revision due to differing package footprints.
Availability
SN74AHCT244MDWREP is available at Aetrix Electronics and suitable for avionics data bus interface, industrial PLC backplane driver, and satellite onboard computer memory buffer applications requiring stable component supply across extended temperature and long-lifecycle programs.
Supply support for SN74AHCT244MDWREP 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, with decades of heritage in space-qualified and military-grade components.
The SN74AHCT244-EP product line delivers radiation-tolerant, extended-temperature octal buffers for mission-critical systems where supply chain continuity and parametric stability are non-negotiable design requirements.
FAQ
What is the maximum recommended operating voltage for SN74AHCT244MDWREP?
The absolute maximum supply voltage for SN74AHCT244MDWREP is 7 V, but the recommended operating range is strictly 4.5 V to 5.5 V per TI's SCLS493A datasheet. Operating outside this window risks violating VOH/VOL specifications and may compromise latch-up immunity. For sustained reliability in extended-temperature applications, maintain VCC at 5.0 V ±5%.
Does SN74AHCT244MDWREP support hot-swap insertion on a live bus?
SN74AHCT244MDWREP supports controlled hot-swap operation only when OE pins are held inactive (high) during insertion, and VCC ramp rate is limited to ≤1 V/ms. Its ±2.5 µA 3-state leakage and bus-friendliness per JESD8-6 make it suitable for such use - but external series resistors (22–47 Ω) on Y outputs are recommended to limit inrush current and suppress reflections.
How does the EPIC™ process benefit SN74AHCT244MDWREP in high-radiation environments?
The EPIC™ (Enhanced-Performance Implanted CMOS) process used in SN74AHCT244MDWREP improves oxide integrity and reduces charge trapping, resulting in superior total ionizing dose (TID) tolerance and single-event latch-up (SEL) immunity. This enables reliable operation in low-earth orbit missions where cumulative radiation exceeds 50 krad(Si), without requiring additional shielding or derating.
Can SN74AHCT244MDWREP drive a 50-pF load within its specified timing?
Yes - SN74AHCT244MDWREP guarantees tPLH/tPHL ≤9.5 ns and tPZH/tPZL ≤13 ns when driving a 50-pF capacitive load at VCC = 5 V, as confirmed in the "Switching Characteristics" table of SCLS493A. This makes it suitable for driving longer traces or multiple fanouts on backplanes without timing violations.
Is SN74AHCT244MDWREP RoHS compliant and lead-free?
Yes - SN74AHCT244MDWREP is RoHS-compliant with NIPDAU (Nickel/Palladium/Gold) lead finish and MSL Level-1 rating (260°C peak reflow, unlimited floor life). The part marking "AHCT244MEP" and packaging documentation confirm full compliance with EU Directive 2011/65/EU and TI's green policy.
SN74AHCT244MDWREP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74AHCT244MDWREP FAQ
1.How can I place an order for SN74AHCT244MDWREP through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT244MDWREP 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 SN74AHCT244MDWREP reliable?
The price and inventory of SN74AHCT244MDWREP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT244MDWREP is usually 5 days.
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4.How is shipping managed for SN74AHCT244MDWREP?
SN74AHCT244MDWREP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT244MDWREP 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 SN74AHCT244MDWREP?
For technical support, including SN74AHCT244MDWREP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT244MDWREP requirements.
6.How does Aetrix verify that SN74AHCT244MDWREP is sourced from the original manufacturer or authorized distributors?
All SN74AHCT244MDWREP 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 SN74AHCT244MDWREP meets industry standards.
7.What is the process for return or replacement of SN74AHCT244MDWREP?
All SN74AHCT244MDWREP units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT244MDWREP, 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 SN74AHCT244MDWREP part is unused and in its original packaging.
Return procedure for SN74AHCT244MDWREP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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