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Texas Instruments SN74AHCT244PWRG4
- Part No.:
- SN74AHCT244PWRG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHCT244PWRG4.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,610
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Product details
Overview
SN74AHCT244PWRG4 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 is used in PC motherboard I/O expansion, industrial control backplanes, and test equipment signal conditioning.
For engineers reviewing the SN74AHCT244PWRG4 datasheet, SN74AHCT244PWRG4 pinout, SN74AHCT244PWRG4 application, or SN74AHCT244PWRG4 equivalent, this page delivers verified electrical specs, TSSOP-20 package details, functional mode behavior, real-world use cases, and validated alternative parts - all grounded in TI's SCLS228O revision O (July 2024) production data.
Technical Context
The SN74AHCT244PWRG4 implements two independent 4-bit non-inverting buffers, each with dedicated 3-state output-enable (1OE, 2OE) control. Its CMOS design ensures rail-to-rail output swing (VOH ≥ 3.8 V at IOH = –8 mA, VOL ≤ 0.44 V at IOL = 8 mA) while accepting TTL-level inputs across the full 5-V supply range.
It supports voltage translation from 3.3-V logic domains to 5-V buses via input overvoltage tolerance up to 5.5 V, and incorporates slow edge-rate control to suppress output ringing on lightly loaded transmission lines - critical for noise-sensitive measurement and networking applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCC) | 4.5 V to 5.5 V - ensures compatibility with standard 5-V logic rails and tolerates ±5% regulation drift. |
| Input Voltage Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - guarantees reliable recognition of TTL-family outputs without level-shifting circuitry. |
| Output Drive Strength | ±8 mA - sufficient for driving 50-pF loads with <9.5 ns propagation delay (tPLH/tPHL), enabling clean signal integrity on PCB traces up to ~10 cm. |
| 3-State Leakage (IOZ) | ±2.5 µA max at VCC = 5.5 V - minimizes bus contention current when outputs are disabled, preserving signal integrity during hot-swap or multiplexed operation. |
| Propagation Delay | tPLH/tPHL = 8.5 ns max (CL = 15 pF), tPLH = 9.5 ns max (CL = 50 pF) - defines maximum timing budget for synchronous bus handshaking in high-speed peripherals. |
| ESD Rating | ±2000 V HBM - meets industrial handling requirements without requiring special ESD workstations during assembly. |
| Operating Temperature | –40°C to +85°C - qualified for commercial and extended-temperature embedded systems including network switches and power infrastructure controllers. |
Pinout & Package
TSSOP-20 package (PW), 6.50 mm × 6.40 mm body size, 0.65 mm lead pitch, RoHS-compliant NIPDAU finish, MSL Level-1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output enables - independently control Group 1 (pins 2,4,6,8 → 12,14,16,18) and Group 2 (pins 11,13,15,17 → 3,5,7,9) buffer sections. |
| 2,4,6,8 | 1A1–1A4 | Group 1 input signals - routed directly to corresponding Y outputs when 1OE = LOW. |
| 11,13,15,17 | 2A1–2A4 | Group 2 input signals - routed to outputs 3,5,7,9 when 2OE = LOW. |
| 12,14,16,18 | 1Y1–1Y4 | Group 1 buffered outputs - high-impedance when 1OE = HIGH; otherwise follow 1A1–1A4 with non-inverting logic. |
| 3,5,7,9 | 2Y1–2Y4 | Group 2 buffered outputs - high-impedance when 2OE = HIGH; otherwise follow 2A1–2A4 with non-inverting logic. |
| 10 | GND | Ground reference - must be low-impedance connection to minimize ground bounce during simultaneous switching. |
| 20 | VCC | 5-V power supply - requires local 0.1-µF ceramic bypass capacitor placed within 3 mm of pin per TI layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | Accepts 3.3-V or 5-V logic levels directly - eliminates need for external level shifters in mixed-voltage systems. |
| Slow edge-rate control | Reduces output ringing and EMI on unterminated or long PCB traces - critical for test & measurement signal fidelity. |
| Independent 3-state groups | Enables bidirectional bus arbitration using separate OE pins - supports half-duplex communication protocols without external logic. |
| Overvoltage-tolerant inputs | Withstands VI up to 5.5 V regardless of VCC - allows safe interfacing with higher-voltage legacy peripherals. |
| Low quiescent current | ICC = 40 µA max - reduces static power in always-on subsystems such as watchdog or status monitoring circuits. |
Applications
| PC Motherboard I/O Expansion | Industrial Backplane Bus Interface |
|---|---|
Use Scenario: Isolating and driving legacy parallel port, LPC, or SMBus signals between chipset and add-in cards. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer providing direction-controlled signal isolation and fanout amplification. Use Value: Enables hot-plug-safe bus sharing by placing unused segments in high-Z state, preventing contention during card insertion/removal. |
Use Scenario: Interfacing microcontroller GPIOs to multi-drop RS-485 transceivers or isolated CAN nodes on factory automation backplanes. IC Role / Device Role / Timing Role: Level-translating buffer isolating MCU I/O from noisy industrial bus drivers while maintaining timing margins. Use Value: TTL-compatible inputs accept 3.3-V MCU outputs; 5-V outputs meet RS-485 driver enable thresholds without additional voltage translation. |
| Network Switch Control Plane | Automated Test Equipment (ATE) Signal Conditioning |
Use Scenario: Driving configuration latches, LED indicators, and reset lines across multiple ASICs in Layer-2/Layer-3 switch management modules. IC Role / Device Role / Timing Role: Low-skew octal driver ensuring synchronized assertion of control signals across distributed logic blocks. Use Value: Matched tPLH/tPHL (≤8.5 ns) and low inter-output skew (<1 ns) guarantee setup/hold compliance for synchronous register loading. |
Use Scenario: Conditioning digital stimulus signals before injection into DUTs during boundary-scan or functional test sequences. IC Role / Device Role / Timing Role: Impedance-matched buffer stage improving signal rise/fall time consistency and reducing reflections on test fixture cables. Use Value: Slow edge rates suppress harmonic content above 100 MHz, minimizing false triggering in high-sensitivity analog measurement channels. |
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 | Identical electrical specs and pinout; same PW package but standard marking (not G4 suffix); RoHS-compliant NIPDAU finish. | No functional difference - G4 denotes TI's green packaging standard (halogen-free, matte tin finish), while PWR uses standard matte tin. | Select SN74AHCT244PWRG4 when halogen-free compliance or TI's enhanced environmental specification is required. |
| 74LVC244APW | Lower VCC range (1.65–3.6 V), 3.6-V absolute max, ±24 mA drive, 3.3-V native logic - not 5-V tolerant or TTL-compatible. | Suitable only for 3.3-V-only systems; cannot replace SN74AHCT244PWRG4 in 5-V or mixed-voltage designs without level shifting. | Choose 74LVC244APW only for cost-sensitive, single-supply 3.3-V applications where 5-V interoperability is unnecessary. |
Compared with SN74AHCT244PWR and 74LVC244APW, the SN74AHCT244PWRG4 uniquely combines 5-V operation, TTL input compatibility, and halogen-free packaging - making it the sole option for legacy 5-V industrial systems requiring both backward compatibility and modern environmental compliance.
Availability
SN74AHCT244PWRG4 is available at Aetrix Electronics and suitable for PC motherboard I/O expansion, industrial backplane bus interface, and automated test equipment signal conditioning requiring stable component supply across multi-year production cycles.
Supply support for SN74AHCT244PWRG4 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 industrial, automotive, and communications markets.
The SN74AHCT244PWRG4 belongs to TI's AHCT logic family, engineered for robust 5-V TTL-compatible interfacing in noise-sensitive, high-reliability applications - particularly where mixed-voltage domain bridging and EMI control are critical.
FAQ
What is the maximum operating temperature for SN74AHCT244PWRG4?
The SN74AHCT244PWRG4 is rated for operation from –40°C to +85°C ambient temperature, as confirmed in Section 5.3 of the TI SCLS228O datasheet. This range applies specifically to the PW (TSSOP-20) package variant and supports deployment in commercial and extended-temperature industrial environments such as network switches and power infrastructure controllers.
Does SN74AHCT244PWRG4 support 3.3-V input logic levels?
Yes, the SN74AHCT244PWRG4 accepts 3.3-V inputs reliably because its VIH threshold is specified at 2.0 V min and VIL at 0.8 V max under 4.5–5.5 V VCC. This allows direct connection to 3.3-V microcontrollers or FPGAs without level-shifting circuitry - a key feature documented in Section 7.3 and Table 5-3 of the datasheet.
What is the purpose of the G4 suffix in SN74AHCT244PWRG4?
The G4 suffix indicates TI's green packaging standard: halogen-free construction with matte tin (NIPDAU) lead finish, compliant with IPC-1752 and JEDEC J-STD-609. This differs from the base SN74AHCT244PWR, which uses standard matte tin. Both share identical electrical performance and pinout, as verified in TI's PACKAGE OPTION ADDENDUM (July 2024).
Can SN74AHCT244PWRG4 drive a 50-pF load within timing specifications?
Yes, the SN74AHCT244PWRG4 guarantees tPLH/tPHL ≤ 9.5 ns and tPZH/tPZL ≤ 13 ns when driving a 50-pF capacitive load at VCC = 5 V, per Table 5-6 in the SCLS228O datasheet. These values include worst-case process/voltage/temperature corners and are production-tested for the PW package.
How should unused inputs be handled on SN74AHCT244PWRG4?
All unused inputs on the SN74AHCT244PWRG4 must be tied to either VCC or GND to prevent floating states that cause excessive ICC and undefined logic behavior. TI explicitly recommends this in Section 8.3.1 and Figure 8-3 of the datasheet - leaving inputs unconnected risks increased power consumption and potential latch-up due to internal parasitic paths.
SN74AHCT244PWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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
SN74AHCT244PWRG4 FAQ
1.How can I place an order for SN74AHCT244PWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT244PWRG4 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 SN74AHCT244PWRG4 reliable?
The price and inventory of SN74AHCT244PWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT244PWRG4 is usually 5 days.
3.What payment methods are accepted for SN74AHCT244PWRG4?
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4.How is shipping managed for SN74AHCT244PWRG4?
SN74AHCT244PWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT244PWRG4 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 SN74AHCT244PWRG4?
For technical support, including SN74AHCT244PWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT244PWRG4 requirements.
6.How does Aetrix verify that SN74AHCT244PWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74AHCT244PWRG4 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 SN74AHCT244PWRG4 meets industry standards.
7.What is the process for return or replacement of SN74AHCT244PWRG4?
All SN74AHCT244PWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT244PWRG4, 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 SN74AHCT244PWRG4 part is unused and in its original packaging.
Return procedure for SN74AHCT244PWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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