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Texas Instruments SN74AHCT244PW
- Part No.:
- SN74AHCT244PW
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHCT244PW.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,260
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Product details
Overview
SN74AHCT244PW from Texas Instruments is an octal 3-state buffer/driver IC designed for bus interface applications, featuring TTL-compatible inputs (VIH = 2 V, VIL = 0.8 V), 5-V supply operation, ±8 mA output drive, and propagation delay of 8.5 ns (CL = 15 pF). It supports voltage translation from 3.3-V logic to 5-V buses in PCs and network switches.
For engineers reviewing the SN74AHCT244PW datasheet, SN74AHCT244PW pinout, SN74AHCT244PW application, or SN74AHCT244PW equivalent, this page delivers verified electrical specs, TSSOP-20 package details, functional mode behavior, real-world use cases, and two validated alternative parts with documented technical and application differences.
Technical Context
The SN74AHCT244PW implements two independent 4-bit non-inverting buffers, each with dedicated 3-state output-enable (1OE, 2OE) control. Inputs accept TTL-voltage levels across the full operating range (–40°C to +85°C), enabling direct interfacing with legacy 3.3-V and 5-V logic families.
Its CMOS design delivers low power consumption (ICC ≤ 40 µA at VCC = 5.5 V), high noise immunity (VIH(D) = 2 V, VIL(D) = 0.8 V), and controlled edge rates to suppress output ringing-critical for signal integrity on lightly loaded PCB traces and backplanes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V digital systems and tolerance to rail droop |
| Input Voltage Compatibility | TTL-level: VIH = 2 V, VIL = 0.8 V - enables direct connection to 3.3-V microcontrollers without level shifters |
| Output Drive | ±8 mA - sufficient for driving multiple CMOS loads or short PCB traces without external buffering |
| Propagation Delay | 8.5 ns max (CL = 15 pF) - supports data rates up to ~115 MHz in non-critical timing paths |
| 3-State Leakage | ±2.5 µA - guarantees high-impedance isolation during bus contention or power-down sequencing |
| Operating Temperature | –40°C to +85°C - qualified for commercial and industrial ambient environments |
| ESD Rating | ±2000 V HBM - meets JEDEC JS-001 for robust handling in automated assembly lines |
Pinout & Package
TSSOP-20 (PW) package: 6.50 mm × 6.40 mm body size, 0.65 mm pitch, thin-profile surface-mount construction optimized for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output enable controls for respective 4-bit sections - tie high via pullup for safe power-up high-Z state |
| 2, 4, 6, 8, 11, 13, 15, 17 | 1A1–1A4, 2A1–2A4 | Eight buffered input terminals - TTL-compatible, overvoltage tolerant to 5.5 V |
| 3, 5, 7, 9, 12, 14, 16, 18 | 2Y4–2Y1, 1Y4–1Y1 | Eight 3-state outputs - non-inverting, capable of sourcing/sinking ±8 mA |
| 10 | GND | Ground reference - must be connected to system ground plane for noise immunity and thermal dissipation |
| 20 | VCC | 5-V power supply - requires local 0.1-µF bypass capacitor placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| TTL-input compatibility | Accepts 3.3-V logic high (2 V min) directly - eliminates need for external level translators in mixed-voltage systems |
| Controlled edge rate | Slower transitions reduce EMI and overshoot/undershoot - improves signal integrity on unterminated traces |
| High-impedance outputs | True 3-state operation with < ±2.5 µA leakage - prevents bus contention and allows multi-driver arbitration |
| Overvoltage-tolerant inputs | Withstands VI up to 5.5 V regardless of VCC - simplifies hot-swap and mixed-rail interface design |
| Latch-up immunity | Exceeds 250 mA per JESD17 - ensures robustness against transient current injection in noisy environments |
Applications
| Network Switch Interface | PC Memory Address Buffering |
|---|---|
Use Scenario: Isolating and driving address/data lines between ASIC and DDR SDRAM controller in enterprise switch line cards. IC Role / Device Role / Timing Role: Octal 3-state buffer providing bidirectional address latching and bus isolation during memory arbitration cycles. Use Value: Enables clean separation of memory subsystem domains while maintaining TTL-compatible timing margins and minimizing crosstalk-induced setup/hold violations. |
Use Scenario: Driving CPU address lines to multiple peripheral decoders in legacy x86 motherboard designs. IC Role / Device Role / Timing Role: Non-inverting buffer amplifying weak address signals to meet fanout and capacitive load requirements of parallel decode logic. Use Value: Delivers consistent 8.5 ns propagation delay across all eight channels, ensuring synchronous access timing across multi-chip address decoding networks. |
| Wearable Health Sensor Hub | Test & Measurement Bus Interface |
Use Scenario: Level-shifting and buffering I²C/SPI control signals from a 3.3-V MCU to 5-V analog front-end ICs in portable ECG monitors. IC Role / Device Role / Timing Role: Voltage translator and signal conditioner enabling interoperability between low-power sensor processors and higher-voltage analog signal chains. Use Value: TTL-compatible inputs eliminate external bias resistors; low ICC (≤40 µA) extends battery life without sacrificing bus drive capability. |
Use Scenario: Interfacing FPGA-based pattern generators to DUTs with 5-V TTL logic standards in automated test equipment racks. IC Role / Device Role / Timing Role: Output driver isolating FPGA I/O banks from variable DUT loading while preserving signal edge fidelity. Use Value: Controlled slew rate minimizes reflected-wave distortion on 50-Ω coaxial interconnects, improving waveform accuracy at 100+ MHz test frequencies. |
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 and TSSOP-20 package; identical electrical specs and pinout; differs only in tape-and-reel packaging (2000 pcs/reel vs. obsolete PW variant) | Identical functional use in all bus-driving, level-shifting, and memory-address buffering roles | Select SN74AHCT244PWR for new designs - it is active, RoHS-compliant, and supported with full TI documentation and volume pricing. |
| SN74LVC244APWR | Lower VCC range (1.65–3.6 V), 3.3-V native logic, ±24 mA drive, faster tPD (5.2 ns), but not TTL-input compatible | Suitable for pure 3.3-V systems requiring higher drive or lower voltage operation; unsuitable for 5-V bus translation | Choose SN74LVC244APWR only when interfacing exclusively with 3.3-V logic and higher current drive is needed; avoid where 5-V compatibility or TTL input thresholds are required. |
Compared with SN74AHCT244PWR, the SN74AHCT244PW shares identical functionality but is obsolete and unsupported; compared with SN74LVC244APWR, the SN74AHCT244PW provides essential 5-V bus compatibility and TTL input thresholds at the cost of lower drive strength and slower speed - making it irreplaceable in mixed-voltage legacy interfaces.
Availability
SN74AHCT244PW is available at Aetrix Electronics and suitable for network switches, PC motherboards, and test equipment requiring stable component supply and long-term obsolescence management support.
Supply support for SN74AHCT244PW 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 delivering analog, embedded processing, and connectivity solutions with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74AHCT244PW belongs to TI's classic 74AHCT logic family, engineered for reliable 5-V bus interfacing, voltage translation, and memory address/data buffering in commercial and industrial systems.
FAQ
What is the operating temperature range for the SN74AHCT244PW?
The SN74AHCT244PW is rated for operation from –40°C to +85°C. This commercial-grade temperature specification aligns with its TSSOP-20 packaging and is validated per TI's recommended operating conditions. The device maintains full electrical performance-including VOH ≥ 3.8 V, VOL ≤ 0.44 V, and tPD ≤ 8.5 ns-at the extremes of this range, making it suitable for desktop PCs, network infrastructure, and industrial control panels.
Does the SN74AHCT244PW support 3.3-V input logic levels?
Yes, the SN74AHCT244PW accepts 3.3-V logic inputs reliably because its VIH threshold is specified at 2.0 V minimum and VIL at 0.8 V maximum under all operating conditions. This TTL-compatible input structure allows direct connection to 3.3-V microcontrollers, FPGAs, and ASICs without external level-shifting circuitry-enabling seamless 3.3-V-to-5-V voltage translation in bus interface applications.
Is the SN74AHCT244PW pin-compatible with other 74-series octal buffers?
Yes, the SN74AHCT244PW is functionally and physically pin-compatible with industry-standard 74AHCT244 devices in TSSOP-20 packages, including SN74AHCT244PWR and SN74AHCT244PWRG4. All share identical pin numbering, electrical characteristics, and functional behavior-including dual 4-bit sections, independent OE controls, and 3-state outputs-ensuring drop-in replacement in existing PCB layouts.
What is the maximum capacitive load the SN74AHCT244PW can drive?
The SN74AHCT244PW is characterized for CL = 15 pF and CL = 50 pF loads in its switching specifications. At 50-pF loading, tPLH/tPHL remains ≤9.5 ns and tPZH/tPZL ≤13 ns, confirming stable operation into typical PCB trace + IC input capacitance combinations. For reliable signal integrity, TI recommends limiting total load per output to ≤50 pF-achievable with ≤10 cm of 50-Ω trace plus three standard CMOS inputs.
How should unused inputs be handled on the SN74AHCT244PW?
All unused inputs on the SN74AHCT244PW must be tied to either VCC or GND to prevent floating states that cause excessive ICC, unpredictable output behavior, or increased EMI. TI specifically recommends connecting unused OE pins to VCC via a pullup resistor (value determined by driver sink capability) to ensure outputs remain in high-impedance during power-up. Unused A inputs may be tied directly to VCC or GND depending on desired default output state.
SN74AHCT244PW 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
SN74AHCT244PW FAQ
1.How can I place an order for SN74AHCT244PW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT244PW 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 SN74AHCT244PW reliable?
The price and inventory of SN74AHCT244PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT244PW is usually 5 days.
3.What payment methods are accepted for SN74AHCT244PW?
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4.How is shipping managed for SN74AHCT244PW?
SN74AHCT244PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT244PW 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 SN74AHCT244PW?
For technical support, including SN74AHCT244PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT244PW requirements.
6.How does Aetrix verify that SN74AHCT244PW is sourced from the original manufacturer or authorized distributors?
All SN74AHCT244PW 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 SN74AHCT244PW meets industry standards.
7.What is the process for return or replacement of SN74AHCT244PW?
All SN74AHCT244PW units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT244PW, 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 SN74AHCT244PW part is unused and in its original packaging.
Return procedure for SN74AHCT244PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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