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Texas Instruments SN74HCT244DWG4
- Part No.:
- SN74HCT244DWG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74HCT244DWG4.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,089
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Product details
Overview
SN74HCT244DWG4 from Texas Instruments is an octal non-inverting 3-state buffer/line driver IC designed for bus-oriented memory address and clock signal conditioning. It operates at 4.5–5.5 V, delivers ±6 mA output drive per channel, exhibits 13 ns typical propagation delay (at 5.5 V, 50 pF), and consumes ≤80 µA ICC in quiescent state. It is used in server backplanes to isolate and strengthen address/data bus signals between CPU and memory modules.
For engineers reviewing the SN74HCT244DWG4 datasheet, SN74HCT244DWG4 pinout, SN74HCT244DWG4 application, or SN74HCT244DWG4 equivalent, key selection criteria include 3-state bus compatibility, TTL-input voltage thresholds (VIH = 2 V min, VIL = 0.8 V max), guaranteed 15-LSTTL load drive capability, and SOIC-20 package thermal performance (RθJA = 109.1 °C/W).
Technical Context
The SN74HCT244DWG4 implements two independent 4-bit non-inverting buffers, each with dedicated active-low output-enable (OE) control. Its CMOS HCT logic family ensures TTL-compatible input thresholds while maintaining CMOS power efficiency. The device supports bidirectional bus isolation by placing outputs in high-impedance state when OE is asserted high.
It features balanced rise/fall times (typ. 7–12 ns), low input current (≤1 µA), and robust ESD protection (±2000 V HBM). All inputs must be actively driven to VCC or GND - floating inputs are prohibited per design specification to prevent undefined states and excessive ICC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures interoperability with standard 5 V TTL and mixed-voltage systems without level shifting. |
| Output Drive | ±6 mA per Y output at 5 V - sufficient to directly drive 15 LSTTL loads, eliminating need for external buffer stages. |
| Propagation Delay | 13 ns typical (tpd, VCC = 5.5 V, CL = 50 pF) - enables reliable operation in 30+ MHz bus timing windows. |
| Quiescent Current | ≤80 µA ICC - minimizes standby power in always-on server I/O subsystems and telecom line cards. |
| Input Thresholds | VIH ≥ 2.0 V, VIL ≤ 0.8 V - guarantees noise-immune recognition of legacy TTL logic levels across temperature. |
| 3-State Leakage | ±0.5 µA IOZ (max) - prevents bus contention and signal corruption during high-impedance mode in shared-bus architectures. |
Pinout & Package
SN74HCT244DWG4 is packaged in a 20-pin SOIC (DW) with 12.80 mm × 10.3 mm footprint and 12.8 mm × 7.5 mm body size. Pin pitch is 1.27 mm; recommended reflow profile is MSL Level-1 (260 °C peak).
| 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 low for data pass-through. |
| 2–5, 11–14 | 1A1–1A4, 2A1–2A4 | Non-inverting input channels - accept TTL-level signals and condition them for bus driving. |
| 3, 5, 7, 9, 12, 14, 16, 18 | 1Y1–1Y4, 2Y1–2Y4 | 3-state buffered outputs - drive bus lines with ±6 mA sink/source; high-Z when OE = high. |
| 10 | GND | Ground reference for all logic and output stages; requires low-inductance connection to minimize switching noise. |
| 20 | VCC | 5 V supply rail; requires local 0.1 µF ceramic bypass capacitor placed adjacent to pin for stable operation. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | VIH/VIL thresholds match legacy TTL families - eliminates need for level translators in retrofitted 5 V systems. |
| High-current 3-state outputs | ±6 mA drive per Y pin enables direct interfacing with multiple LSTTL loads without fanout buffers. |
| Low static power consumption | ≤80 µA ICC allows use in thermally constrained server DIMM slots and industrial I/O modules with limited airflow. |
| Controlled edge rates | Typical tr/tf = 7–12 ns reduces EMI and signal integrity risk on PCB traces up to 15 cm in length. |
| Bus contention prevention | Dedicated OE pins per group allow precise timing control - avoids simultaneous drive conflicts in multi-master buses. |
Applications
| Server Memory Address Buffering | Industrial LED Display Driver Interface |
|---|---|
Use Scenario: Isolating and strengthening CPU-generated memory address signals before routing to multiple DRAM modules on a dense server motherboard. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer that enables/disables address bus segments under chipset control to prevent contention during refresh cycles. Use Value: Guarantees clean 13 ns propagation with 15-LSTTL drive strength - eliminates timing margin loss and signal degradation across 8-layer backplanes. |
Use Scenario: Interfacing microcontroller GPIOs to multiplexed 8-digit, 7-segment LED displays in factory HMIs with long trace runs. IC Role / Device Role / Timing Role: Octal line driver translating low-drive MCU outputs into robust current-sourced segment/column drivers. Use Value: ±6 mA per output sustains consistent LED brightness across all digits without external transistors; 3-state allows dynamic digit scanning. |
| Telecom Line Card Bus Isolation | Network Switch Control Plane Buffering |
Use Scenario: Shielding FPGA-based control logic from noisy high-speed data paths in carrier-grade Ethernet line cards operating at -40°C to 85°C. IC Role / Device Role / Timing Role: Bidirectional bus isolator enabling safe hot-swap of daughterboards via controlled OE assertion. Use Value: High-impedance leakage <0.5 µA prevents signal bleed during insertion/removal; wide temp range ensures reliability in uncontrolled enclosures. |
Use Scenario: Driving configuration registers and status indicators across a 12-port managed switch PCB where trace lengths exceed 10 cm. IC Role / Device Role / Timing Role: Signal repeater buffering slow-control signals (I²C, GPIO, reset) to maintain setup/hold margins at 25 MHz. Use Value: 13 ns tpd and 10 pF input capacitance preserve timing integrity - avoids metastability in register writes during firmware updates. |
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 |
|---|---|---|---|
| SN74HCT244DWR | Same SOIC-20 package, identical electrical specs, RoHS-compliant NIPDAU finish, MSL-1 rating - differs only in tape-and-reel packaging (2000 pcs vs. 1000 pcs). | No functional difference; suitable for same board designs and automated assembly lines. | Select SN74HCT244DWR for volume SMT production requiring standard reel logistics and full RoHS compliance. |
| 74HCT244N | PDIP-20 package (24.33 mm × 9.4 mm), through-hole mounting, same logic function and DC specs, but higher RθJA (84.6 °C/W) and no MSL rating. | Intended for prototyping, repair, or legacy through-hole systems - not suitable for high-density SMT boards. | Choose 74HCT244N only for hand-soldered evaluation or field-replaceable modules where SOIC footprint is unavailable. |
Compared with SN74HCT244DWR and 74HCT244N, SN74HCT244DWG4 offers identical core functionality in SOIC-20 with industry-standard lead finish and moisture sensitivity handling - making it optimal for high-reliability, automated manufacturing of telecom and server hardware.
Availability
SN74HCT244DWG4 is available at Aetrix Electronics and suitable for server backplanes, industrial LED display interfaces, and telecom line card bus isolation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74HCT244DWG4 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 communications markets.
SN74HCT244DWG4 belongs to TI's HCT logic family - engineered for seamless integration between TTL and CMOS systems, emphasizing bus integrity, low power, and robust noise immunity in mission-critical infrastructure equipment.
FAQ
What is the maximum operating temperature for SN74HCT244DWG4?
The SN74HCT244DWG4 is rated for operation from –40°C to 85°C ambient temperature. This range is confirmed in TI's official orderable addendum and applies to all SOIC-packaged variants including SN74HCT244DWG4. Exceeding 85°C may cause parametric shift in VOH/VOL and increased ICC beyond datasheet limits.
Does SN74HCT244DWG4 require external pull-up resistors on its OE pins?
SN74HCT244DWG4 does not require external pull-up resistors on OE pins during normal operation - they are actively driven by system logic. However, during power-up/power-down sequencing, TI recommends tying OE to VCC via a pull-up resistor (value determined by driver sink capability) to ensure outputs remain in high-impedance state until control logic stabilizes.
Can SN74HCT244DWG4 drive standard 5 V TTL loads directly?
Yes, SN74HCT244DWG4 is explicitly specified to drive up to 15 LSTTL loads per output. Its ±6 mA output drive at 5 V, combined with TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V), enables direct interface with legacy 74LS-series devices without level-shifting circuitry.
What is the input capacitance of SN74HCT244DWG4?
The input capacitance (Ci) of SN74HCT244DWG4 is 10 pF maximum across the 4.5–5.5 V supply range. This low value minimizes loading on upstream drivers and preserves signal integrity in high-speed routing - critical for maintaining timing margins in server memory address paths.
Is SN74HCT244DWG4 pin-compatible with other HCT244 variants like SN74HCT244DWR?
Yes, SN74HCT244DWG4 is mechanically and electrically pin-compatible with SN74HCT244DWR and all other SOIC-20 packaged HCT244 variants. Both share identical pinout, footprint, voltage ratings, timing, and logic behavior - differing only in packaging format (tape-and-reel vs. tube) and surface finish documentation.
SN74HCT244DWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74HCT244DWG4 FAQ
1.How can I place an order for SN74HCT244DWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCT244DWG4 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 SN74HCT244DWG4 reliable?
The price and inventory of SN74HCT244DWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCT244DWG4 is usually 5 days.
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SN74HCT244DWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCT244DWG4 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 SN74HCT244DWG4?
For technical support, including SN74HCT244DWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCT244DWG4 requirements.
6.How does Aetrix verify that SN74HCT244DWG4 is sourced from the original manufacturer or authorized distributors?
All SN74HCT244DWG4 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 SN74HCT244DWG4 meets industry standards.
7.What is the process for return or replacement of SN74HCT244DWG4?
All SN74HCT244DWG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCT244DWG4, 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 SN74HCT244DWG4 part is unused and in its original packaging.
Return procedure for SN74HCT244DWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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