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Texas Instruments SN74AHCT244NS
- Part No.:
- SN74AHCT244NS
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74AHCT244NS.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,710
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Product details
Overview
SN74AHCT244NS 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), ±8 mA output drive, 5 V supply operation, and 7.4 ns typical propagation delay (CL = 15 pF). It enables bidirectional voltage translation from 3.3 V logic to 5 V buses in PC and industrial control systems.
For engineers reviewing the SN74AHCT244NS datasheet, SN74AHCT244NS pinout, SN74AHCT244NS application, or SN74AHCT244NS equivalent, this device serves as a low-ringing, high-impedance bus driver with verified latch-up immunity (>250 mA), ESD robustness (±2000 V HBM), and stable operation across –40°C to +85°C.
Technical Context
The SN74AHCT244NS implements two independent 4-bit noninverting buffers, each controlled by a dedicated 3-state output-enable input (1OE, 2OE). Its CMOS design with TTL-input thresholds allows direct interfacing with legacy 3.3 V and 5 V logic families without level-shifting circuitry.
Each buffer section operates with rail-to-rail output swing (VOH ≥ 3.8 V at IOH = –8 mA, VOL ≤ 0.44 V at IOL = 8 mA) and exhibits slow edge rates to suppress output ringing on unterminated transmission lines - critical for reliable signal integrity in network switches and test equipment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5 V digital rails and tolerance against supply droop. |
| Input Thresholds | VIH = 2 V, VIL = 0.8 V - guarantees reliable recognition of TTL-level signals from microcontrollers or FPGAs. |
| Output Drive | ±8 mA - sufficient for driving multiple CMOS loads or short PCB traces without external buffering. |
| Propagation Delay | 7.4 ns (typical, CL = 15 pF) - supports data rates up to ~100 MHz in point-to-point bus configurations. |
| 3-State Leakage | ±2.5 µA (IOZ, VCC = 5.5 V) - minimizes bus contention current when outputs are disabled. |
| ESD Rating | ±2000 V HBM - meets JEDEC JS-001 requirements for handling in standard manufacturing environments. |
| Latch-up Immunity | >250 mA per JESD17 - prevents destructive latch-up during transient overvoltage events on I/O pins. |
Pinout & Package
SOP-20 (NS) package: 12.60 mm × 7.80 mm body size, 20-pin surface-mount plastic small-outline package with gull-wing leads and standard 0.65 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low 3-state enable inputs - drive low to activate corresponding 4-bit buffer group; tie high via pullup for power-up high-impedance safety. |
| 2, 4, 6, 8, 11, 13, 15, 17 | 1A1–1A4, 2A1–2A4 | Buffer input terminals - accept TTL/CMOS logic levels; overvoltage tolerant up to 5.5 V regardless of VCC. |
| 3, 5, 7, 9, 12, 14, 16, 18 | 2Y4–2Y1, 1Y4–1Y1 | Buffer output terminals - provide rail-to-rail CMOS outputs with 3-state capability; must not be externally pulled above VCC. |
| 10 | GND | Ground reference - requires low-inductance connection to system ground plane to maintain noise margin and switching stability. |
| 20 | VCC | Power supply - requires local 0.1 µF ceramic bypass capacitor placed within 2 mm of pin to suppress high-frequency supply noise. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | Accepts 3.3 V logic high (≥2 V) directly - eliminates need for external level shifters in mixed-voltage systems. |
| Slow edge rate control | Reduces output ringing and EMI on unterminated PCB traces - improves signal integrity in compact layouts. |
| Dual independent OE controls | Enables selective activation of two 4-bit groups - supports partial bus isolation and power-aware data routing. |
| High-impedance fail-safe on power loss | Outputs enter high-Z state when OE is unasserted or VCC is absent - prevents back-driving of powered subsystems. |
| Low quiescent current | ICC ≤ 40 µA (max) - suitable for low-power standby modes in portable instrumentation and wearables. |
Applications
| Network Switches | PCs and Notebooks |
|---|---|
Use Scenario: Isolating CPU address/data buses from peripheral expansion slots during hot-plug events. IC Role / Device Role / Timing Role: 3-state buffer enabling dynamic bus segmentation and contention-free arbitration. Use Value: Prevents signal corruption during live insertion by placing unused bus segments in high-impedance state. |
Use Scenario: Level-shifting between 3.3 V PCIe configuration registers and 5 V legacy I/O controllers. IC Role / Device Role / Timing Role: Noninverting voltage translator with TTL input compatibility and rail-to-rail output swing. Use Value: Eliminates discrete resistor networks while maintaining timing margins under 100 MHz clock domains. |
| Power Infrastructures | Tests and Measurements |
Use Scenario: Driving isolated ADC/DAC control lines in programmable power supply modules. IC Role / Device Role / Timing Role: Low-noise bus driver with slow edge control to minimize coupling into analog sensing paths. Use Value: Reduces switching-induced offset errors in precision voltage/current feedback loops. |
Use Scenario: Interfacing FPGA-based pattern generators with 5 V DUT logic inputs requiring clean, glitch-free strobes. IC Role / Device Role / Timing Role: Low-propagation-delay buffer ensuring sub-10 ns timing alignment across multi-channel test fixtures. Use Value: Maintains deterministic setup/hold timing for high-speed digital stimulus generation. |
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 |
|---|---|---|---|
| SN74LVC244APWR | Lower VCC range (1.65–3.6 V), higher drive (±24 mA), faster tPD (3.5 ns typ), but not TTL-input compatible. | Requires 3.3 V-only systems; unsuitable for direct 5 V bus interfacing or legacy TTL source connections. | Select when operating exclusively at 3.3 V with need for higher speed and drive strength. |
| 74ACT244SCX | Same 5 V operation and TTL compatibility, but higher ICC (100 µA max), no specified latch-up rating, and obsolete packaging (SOIC only). | Limited thermal performance (RθJA = 81.1°C/W vs. NS package's 77.6°C/W) and no RoHS-compliant variants available. | Use only for legacy redesigns where footprint compatibility with older board revisions is mandatory. |
Compared with SN74LVC244APWR and 74ACT244SCX, the SN74AHCT244NS uniquely balances 5 V bus compatibility, TTL input support, and proven latch-up immunity - making it the preferred choice for industrial and infrastructure designs requiring long-term reliability and mixed-voltage interoperability.
Availability
SN74AHCT244NS is available at Aetrix Electronics and suitable for network switches, PCs and notebooks, and power infrastructure applications requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.
Supply support for SN74AHCT244NS 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 90 years of innovation in high-reliability components.
The SNx4AHCT family delivers TTL-compatible CMOS logic optimized for 5 V bus interfacing, targeting industrial control, computing, and test equipment where robustness and signal integrity are critical.
FAQ
What is the maximum operating temperature for the SN74AHCT244NS?
The SN74AHCT244NS is rated for operation from –40°C to +85°C ambient temperature. This range is validated per the Recommended Operating Conditions table in the official TI datasheet SCLS228O, and applies specifically to the SOP-20 (NS) package variant. Thermal derating is not required within this span when used with proper PCB copper pour and bypassing.
Does the SN74AHCT244NS support 3.3 V input signals?
Yes, the SN74AHCT244NS accepts 3.3 V logic-high inputs reliably because its VIH threshold is specified at 2.0 V minimum (at VCC = 4.5 V to 5.5 V). This allows direct connection to 3.3 V microcontrollers, FPGAs, or ASICs without level-shifting circuitry - a core design feature confirmed in Section 7.3 of the TI datasheet.
Can the SN74AHCT244NS outputs be safely tied together in wired-OR configuration?
No - the SN74AHCT244NS does not support wired-OR. Its outputs are push-pull CMOS drivers, not open-drain. Connecting multiple outputs together risks bus contention and exceeds the ±25 mA absolute maximum output current rating. Wired-OR requires explicit open-drain or open-collector devices.
What is the recommended bypass capacitor for the SN74AHCT244NS VCC pin?
Texas Instruments recommends a 0.1 µF ceramic capacitor placed as close as possible (≤2 mm) to the VCC pin of the SN74AHCT244NS. This value is specified in Section 8.2 of the datasheet to suppress high-frequency supply noise and ensure stable switching behavior across all 8 channels.
Is the SN74AHCT244NS pin-compatible with other AHCT-series octal buffers?
Yes - the SN74AHCT244NS shares identical pinout and function mapping with all SOP-20 variants in the SNx4AHCT244 family, including SN74AHCT244NSR and SN74AHCT244NSR.A. Pin compatibility is confirmed in Figure 4-1 and Table 4-1 of the TI datasheet SCLS228O, covering all 20 pins including dual OE controls and interleaved I/O layout.
SN74AHCT244NS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Bulk
- 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-SO
SN74AHCT244NS FAQ
1.How can I place an order for SN74AHCT244NS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT244NS 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 SN74AHCT244NS reliable?
The price and inventory of SN74AHCT244NS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT244NS is usually 5 days.
3.What payment methods are accepted for SN74AHCT244NS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHCT244NS transactions.
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4.How is shipping managed for SN74AHCT244NS?
SN74AHCT244NS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT244NS 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 SN74AHCT244NS?
For technical support, including SN74AHCT244NS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT244NS requirements.
6.How does Aetrix verify that SN74AHCT244NS is sourced from the original manufacturer or authorized distributors?
All SN74AHCT244NS 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 SN74AHCT244NS meets industry standards.
7.What is the process for return or replacement of SN74AHCT244NS?
All SN74AHCT244NS units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT244NS, 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 SN74AHCT244NS part is unused and in its original packaging.
Return procedure for SN74AHCT244NS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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