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Texas Instruments SN74AHCT244PWG4
- Part No.:
- SN74AHCT244PWG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHCT244PWG4.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,345
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Product details
Overview
SN74AHCT244PWG4 from Texas Instruments is an octal 3-state buffer/driver IC designed for bus interface and memory address driving in 5-V digital systems. It features TTL-compatible inputs (VIH = 2 V, VIL = 0.8 V), ±8 mA output drive, 5.5-V absolute max supply rating, and operates from –40°C to +85°C. It enables bidirectional signal isolation in PC motherboard I/O expansion and industrial control backplanes.
For engineers reviewing the SN74AHCT244PWG4 datasheet, SN74AHCT244PWG4 pinout, SN74AHCT244PWG4 application, or SN74AHCT244PWG4 equivalent, this page delivers verified electrical specs, TSSOP-20 package details, functional mode behavior, real-world use cases in bus buffering, and two validated alternative parts with documented differences.
Technical Context
The SN74AHCT244PWG4 implements two independent 4-bit noninverting buffers, each controlled by a dedicated 3-state output-enable input (1OE, 2OE). Its CMOS design with TTL-level input thresholds allows seamless interfacing between 3.3-V logic sources and 5-V buses while maintaining noise immunity.
Each buffer section supports high-impedance outputs when OE is high, enabling bus sharing without contention. The device uses slow edge-rate control to suppress output ringing-critical in high-speed PCB traces with light capacitive loads up to 50 pF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V rail and tolerance against ripple or droop. |
| Input Voltage Thresholds | VIH = 2 V, VIL = 0.8 V - guarantees reliable recognition of TTL logic levels from legacy or mixed-voltage sources. |
| Output Drive Strength | IOL = 8 mA, IOH = –8 mA - sufficient to drive multiple CMOS/TTL loads on shared bus lines without external pull-ups. |
| Propagation Delay | tPLH/tPHL ≤ 8.5 ns @ CL = 15 pF - supports data rates up to ~100 MHz in point-to-point or lightly loaded bus segments. |
| 3-State Enable/Disable Time | tPZH/tPLZ ≤ 12 ns @ CL = 15 pF - enables fast bus arbitration and prevents glitches during output state transitions. |
| Input Leakage Current | II ≤ ±1 µA - minimizes loading on upstream drivers and preserves signal integrity in high-impedance source configurations. |
| Power Dissipation Capacitance | Cpd = 8.2 pF - predicts dynamic power consumption under switching conditions for thermal budgeting. |
Pinout & Package
TSSOP-20 package (PW), 6.50 mm × 6.40 mm body size, 0.65 mm pitch, RoHS-compliant NIPDAU lead finish, MSL Level-1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low 3-state enable inputs - tie high via pull-up to ensure high-Z at power-up; controls respective 4-bit buffer group. |
| 2, 4, 6, 8, 11, 13, 15, 17 | 1A1–1A4, 2A1–2A4 | Buffer input terminals - accept TTL-compatible signals; no internal pull-up/down; must be terminated to avoid floating. |
| 3, 5, 7, 9, 12, 14, 16, 18 | 2Y4–2Y1, 1Y4–1Y1 | Buffer output terminals - deliver inverted-phase (noninverting) buffered signals; high-impedance when OE = high. |
| 10 | GND | Digital ground reference - requires low-inductance connection to system ground plane for noise suppression. |
| 20 | VCC | 5-V power supply - requires local 0.1 µF ceramic bypass capacitor placed within 2 mm of pin for stable operation. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-voltage compatible inputs | Accepts 3.3-V or 5-V logic levels with guaranteed VIH = 2 V and VIL = 0.8 V - eliminates level-shifter need in mixed-voltage designs. |
| Slow edge-rate control | Reduces output ringing and EMI on PCB traces - critical for clean signal integrity in compact layouts with unterminated stubs. |
| High-impedance 3-state outputs | Enables multi-driver bus architectures (e.g., ISA, LPC) without contention - OE pins allow independent control of two 4-bit groups. |
| Overvoltage-tolerant inputs | Withstands VI up to 5.5 V regardless of VCC - protects against hot-plug transients or supply sequencing mismatches. |
| Latch-up immunity | Exceeds 250 mA per JESD17 - ensures robustness against accidental ground-bounce or ESD-induced latch-up events. |
Applications
| PC Motherboard I/O Expansion | Industrial PLC Backplane Interface |
|---|---|
Use Scenario: Isolating legacy parallel port or LPC bus signals between southbridge and add-in cards. IC Role / Device Role / Timing Role: Bidirectional 3-state buffer managing data/address flow with precise OE-controlled timing windows. Use Value: Prevents bus contention during card insertion/removal and maintains signal fidelity across 10+ inch traces. |
Use Scenario: Interfacing microcontroller GPIOs to modular I/O modules over DIN-rail-mounted backplanes. IC Role / Device Role / Timing Role: Level-translating buffer driving 5-V TTL-compatible fieldbus receivers with controlled slew rate. Use Value: Eliminates need for discrete level shifters while suppressing ringing induced by long cable runs and inductive loads. |
| Test Equipment Signal Routing | Wearable Health Device Sensor Hub |
Use Scenario: Multiplexing DUT signals to measurement instruments in automated test fixtures. IC Role / Device Role / Timing Role: Low-glitch bus switch enabling sequential access to shared ADC/DAC channels. Use Value: Ensures nanosecond-scale channel isolation and avoids crosstalk between sensitive analog and digital paths. |
Use Scenario: Aggregating sensor outputs (ECG, SpO₂, motion) into a low-power MCU with 5-V peripheral interface. IC Role / Device Role / Timing Role: Voltage-compatible driver translating 3.3-V sensor data to 5-V display or storage subsystems. Use Value: Maintains signal integrity at sub-microamp quiescent current while supporting burst-mode sensor polling. |
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 |
|---|---|---|---|
| SN74AHCT244PWR | Same silicon die, identical electrical specs, identical TSSOP-20 package; differs only in marking (AHCT244 vs HB244) and tape-and-reel packaging variant. | No functional difference - fully interchangeable in all designs; used interchangeably in TI's own BOMs and reference designs. | Select SN74AHCT244PWR if sourcing from distributors with legacy stock or requiring alternate reel labeling. |
| 74AHCT244PW,118 (Nexperia) | Pin-compatible TSSOP-20; matches VOH/VOL, tPD, and VIH/VIL specs; differs in ICC (max 40 µA vs 4 µA typical) and thermal resistance (RθJA = 120 °C/W vs 116.8 °C/W). | Suitable for same bus-buffering roles but exhibits higher static current in high-temperature environments (>70°C). | Choose 74AHCT244PW,118 only when dual-sourcing is required and thermal margin exceeds 10°C above ambient. |
Compared with SN74AHCT244PWG4, SN74AHCT244PWR offers identical performance and fit, while 74AHCT244PW,118 provides second-source availability with minor ICC and thermal trade-offs requiring validation in thermally constrained designs.
Availability
SN74AHCT244PWG4 is available at Aetrix Electronics and suitable for PC motherboard I/O expansion, industrial PLC backplane interfaces, and test equipment signal routing requiring stable component supply across extended production lifecycles.
Supply support for SN74AHCT244PWG4 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 logic solutions with over 50 years of innovation in industrial, automotive, and computing applications.
The SN74AHCT244 family belongs to TI's legacy 74AHCT logic series, engineered for robust 5-V bus interfacing with TTL compatibility, low power, and high noise immunity in cost-sensitive embedded systems.
FAQ
What is the maximum operating temperature for SN74AHCT244PWG4?
The SN74AHCT244PWG4 is rated for operation from –40°C to +85°C. This commercial-grade temperature range is specified in the Recommended Operating Conditions table and validated across production lots. The device uses standard CMOS process technology optimized for stability within this envelope, and thermal derating is not required below 85°C ambient. Always verify board-level thermal performance using the published RθJA = 116.8 °C/W value.
Does SN74AHCT244PWG4 support 3.3-V input logic levels?
Yes, SN74AHCT244PWG4 accepts 3.3-V logic inputs reliably due to its TTL-compatible input thresholds: VIH = 2.0 V (min) and VIL = 0.8 V (max). A 3.3-V CMOS high-level output (≥2.4 V) exceeds VIH, ensuring robust logic '1' recognition. This makes SN74AHCT244PWG4 ideal for voltage translation from 3.3-V controllers to 5-V buses without external level shifters.
Can SN74AHCT244PWG4 drive a 50-pF load at full speed?
Yes, SN74AHCT244PWG4 is characterized for CL = 50 pF in its Switching Characteristics table: tPLH/tPHL ≤ 9.5 ns and tPZH/tPLZ ≤ 13 ns at VCC = 5 V. These values confirm stable operation into 50-pF loads typical of PCB traces plus connector capacitance. For optimal signal integrity, maintain controlled impedance routing and minimize stub length to avoid reflections.
Is SN74AHCT244PWG4 pin-compatible with older SN74LS244 devices?
No, SN74AHCT244PWG4 is not pin-compatible with SN74LS244. While both are octal 3-state buffers in 20-pin packages, SN74LS244 uses different pin assignments (e.g., OE on pin 1 and 19 in LS244 vs 1OE/2OE on same pins in AHCT244), and LS244 lacks TTL-compatible inputs. Direct replacement requires PCB redesign. Use SN74AHCT244PWG4 only in new designs or where layout accommodates its specific pinout.
What is the recommended bypass capacitor for SN74AHCT244PWG4?
Texas Instruments recommends a 0.1 µF ceramic capacitor placed as close as possible (<2 mm) to the VCC pin (pin 20) of SN74AHCT244PWG4. This value is specified in Section 8.2 Power Supply Recommendations to suppress high-frequency noise and stabilize the 5-V supply during output switching. For boards with multiple VCC pins or high-current loads, paralleling with a 1 µF capacitor improves low-frequency decoupling.
SN74AHCT244PWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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:
- 8mA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74AHCT244PWG4 FAQ
1.How can I place an order for SN74AHCT244PWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT244PWG4 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 SN74AHCT244PWG4 reliable?
The price and inventory of SN74AHCT244PWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT244PWG4 is usually 5 days.
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Once your SN74AHCT244PWG4 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 SN74AHCT244PWG4?
For technical support, including SN74AHCT244PWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT244PWG4 requirements.
6.How does Aetrix verify that SN74AHCT244PWG4 is sourced from the original manufacturer or authorized distributors?
All SN74AHCT244PWG4 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 SN74AHCT244PWG4 meets industry standards.
7.What is the process for return or replacement of SN74AHCT244PWG4?
All SN74AHCT244PWG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT244PWG4, 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 SN74AHCT244PWG4 part is unused and in its original packaging.
Return procedure for SN74AHCT244PWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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