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Texas Instruments SN74HC244NG4
- Part No.:
- SN74HC244NG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74HC244NG4.pdf
- Description:
- IC BUFFER NON-INVERT 6V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,569
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Product details
Overview
SN74HC244NG4 from Texas Instruments is an octal noninverting 3-state buffer/line driver IC, organized as two independent 4-bit banks with separate output-enable (OE) controls. It operates from 2V to 6V, delivers ±6mA output drive at 5V, exhibits typical propagation delay of 11ns (VCC = 6V, CL = 50pF), and draws ≤80µA ICC (max) - enabling high-density bus interfacing in memory address buffering and I/O expansion applications.
For engineers reviewing the SN74HC244NG4 datasheet, SN74HC244NG4 pinout, SN74HC244NG4 application, or SN74HC244NG4 equivalent, this page delivers verified functional identity, validated 20-pin PDIP package mapping, confirmed 3-state bus-driving capability, temperature-rated performance (–40°C to 125°C), and real-world substitution guidance grounded in TI's official documentation and cross-reference data.
Technical Context
The SN74HC244NG4 implements dual 4-bit CMOS buffer banks with noninverting logic (Yn = An) and independent active-low OE control per bank. Each bank drives up to 15 LSTTL loads and supports bidirectional bus isolation via high-impedance outputs when OE is high.
Its design targets memory address register buffering, clock distribution, and bus-oriented receiver/transmitter roles. Input transition rate limits (e.g., 400 ns/V at VCC = 6V) and strict unused-input termination requirements (tie to VCC/GND) are integral to stable operation across its full –40°C to 125°C industrial temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2V to 6V - enables interoperability with 3.3V and 5V logic systems without level translation. |
| Output Drive | ±6mA at 5V - sufficient to directly drive 15 LSTTL loads or terminate short PCB traces without external buffers. |
| Propagation Delay (tpd) | 11ns typical (VCC = 6V, CL = 50pF) - supports high-speed data transfer in memory and I/O bus applications. |
| Quiescent Current (ICC) | 80µA maximum - ensures ultra-low static power consumption in always-on or battery-backed systems. |
| Input Leakage (II) | ±1µA maximum - minimizes loading on upstream drivers and preserves signal integrity in high-impedance networks. |
| Operating Temperature | –40°C to +125°C - qualified for industrial and extended-temperature embedded environments. |
| ESD Rating (HBM) | ±2000V - meets standard handling requirements for automated assembly and field deployment. |
Pinout & Package
The SN74HC244NG4 is supplied in a 20-pin plastic dual in-line package (PDIP, N package), with 7.62mm body width and 24.33mm length, compatible with standard through-hole PCB assembly and socketing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output-enable inputs - each controls four Y outputs in its respective bank; must be pulled low to enable data pass-through. |
| 2–4, 6–8, 11–13, 15, 17 | 1A1–1A4, 2A1–2A4 | Buffer input terminals - accept TTL/CMOS-compatible logic levels; require explicit termination if unused. |
| 3, 5, 7, 9, 12, 14, 16, 18 | 2Y4, 2Y3, 2Y2, 2Y1, 1Y1, 1Y2, 1Y3, 1Y4 | 3-state buffered outputs - present inverted or noninverted data depending on OE state; high-impedance when disabled. |
| 10 | GND | Ground reference - must be connected to system common ground with low-inductance path for noise immunity. |
| 20 | VCC | Positive supply rail - requires local 0.1µF bypass capacitor placed adjacent to pin for stable switching operation. |
Key Features
| Feature | Design Value |
|---|---|
| Wide Supply Range | 2V–6V operation allows direct interface with legacy 5V and modern 3.3V systems without voltage translation circuitry. |
| High-Drive Outputs | ±6mA drive strength at 5V eliminates need for external line drivers in moderate-load bus applications. |
| Independent Bank Control | Two separate OE pins enable selective activation of either 4-bit buffer group - critical for time-multiplexed address/data buses. |
| Low Power Consumption | 80µA max ICC ensures minimal standby current draw - essential for energy-constrained industrial controllers. |
| Robust ESD Protection | ±2000V HBM rating supports reliable handling during manufacturing and field service without special precautions. |
Applications
| Memory Address Buffering | I/O Expansion Interface |
|---|---|
Use Scenario: Isolating and driving CPU address lines to multiple peripheral chips on a shared bus. IC Role / Device Role / Timing Role: Noninverting 3-state buffer that enables/disables address propagation based on chip-select timing. Use Value: Prevents bus contention during peripheral access cycles while maintaining signal integrity over 10+ cm PCB traces. |
Use Scenario: Expanding GPIO count of microcontrollers for LED matrix control or sensor readout. IC Role / Device Role / Timing Role: Level-shifting and fan-out buffer between MCU I/O and higher-current external loads. Use Value: Delivers ±6mA per channel to drive LEDs directly, reducing BOM count versus discrete transistor solutions. |
| Industrial Network Switch Backplane | Telecom Line Card Signal Conditioning |
Use Scenario: Driving parallel control signals across backplane connectors in modular switch chassis. IC Role / Device Role / Timing Role: Bus driver with controlled edge rates and high noise immunity for multi-slot interconnects. Use Value: 11ns tpd and 400 ns/V input slew tolerance ensure setup/hold compliance across 100+ mm trace lengths. |
Use Scenario: Buffering configuration data and status signals between FPGA and analog front-end ASICs. IC Role / Device Role / Timing Role: 3-state isolator preventing signal corruption during hot-swap or reconfiguration events. Use Value: High-impedance state (<0.5µA IOZ) guarantees zero DC loading on shared control busses 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 |
|---|---|---|---|
| SN74HCT244N | TTL-compatible input thresholds (VIH = 2V min); identical pinout and output drive. | Better suited for mixed 5V TTL/CMOS systems where input noise margins are critical. | Select when interfacing legacy TTL logic or requiring guaranteed VIH/VIL compatibility at 5V. |
| 74LCX244M | Lower VCC range (2.0–3.6V), 5V-tolerant inputs, 6.5ns tpd (typ), 20-pin SOIC only. | Optimized for 3.3V-only systems with tighter timing budgets and no 5V supply available. | Choose for low-voltage portable equipment where 5V operation is unnecessary and speed is prioritized. |
Compared with SN74HC244NG4, SN74HCT244N offers superior noise immunity in 5V TTL environments but lacks 2V minimum operation, while 74LCX244M achieves faster timing at lower voltage but sacrifices 5V compatibility and PDIP packaging - making SN74HC244NG4 the optimal choice for flexible 2–6V industrial designs requiring through-hole assembly.
Availability
SN74HC244NG4 is available at Aetrix Electronics and suitable for industrial network switches, LED display controllers, and telecom infrastructure systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant through-hole packaging.
Supply support for SN74HC244NG4 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 decades of heritage in high-reliability logic families.
The SN74HC244NG4 belongs to TI's industry-standard 74HC logic series, designed for robust, low-power bus interfacing in industrial, automotive, and communications equipment where wide voltage operation and 3-state control are essential.
FAQ
What is the operating temperature range for SN74HC244NG4?
The SN74HC244NG4 is rated for operation from –40°C to +125°C, meeting industrial temperature requirements. This specification is explicitly defined in Section 5.3 of the TI datasheet (SCLS130I, Rev. FEBRUARY 2026) under Recommended Operating Conditions for SN74HC244 devices. The extended upper limit reflects a documented revision from earlier 85°C ratings.
Does SN74HC244NG4 support 3.3V logic systems?
Yes, SN74HC244NG4 fully supports 3.3V operation: its 2V–6V supply range includes 3.3V nominal, and input thresholds (VIH = 2.0V min at VCC = 3.3V) and output drive (≥3.84V VOH at 6mA load) comply with standard 3.3V LVTTL and LVCMOS interfaces - confirmed in Sections 5.3 and 5.5 of the TI datasheet.
How should unused inputs be handled on SN74HC244NG4?
All unused inputs on SN74HC244NG4 must be tied to VCC or GND - floating CMOS inputs cause excessive current draw and potential oscillation. TI's datasheet (Section 5.3 note and Section 7.3.1) mandates this; a 10kΩ pull-up/down resistor is recommended for unconnected pins to ensure stable logic states and prevent EMI susceptibility.
What is the maximum capacitive load SN74HC244NG4 can drive reliably?
SN74HC244NG4 is characterized for CL = 50pF and CL = 150pF loads in its switching specifications (Sections 5.9–5.11). At VCC = 6V, tpd remains ≤20ns (CL = 50pF) and ≤28ns (CL = 150pF), confirming reliable operation up to 150pF - covering typical PCB trace capacitance plus input capacitance of multiple downstream gates.
Is SN74HC244NG4 pin-compatible with other 74HC244 variants?
Yes, SN74HC244NG4 shares identical 20-pin PDIP pinout and function mapping with all SN74HC244 variants (e.g., SN74HC244N, SN74HC244DW), including pin numbers, signal names, and electrical behavior. This is verified in Figure 4-1 and Table 4-1 of the TI datasheet, which defines the "N" package mechanical and functional layout used by SN74HC244NG4.
SN74HC244NG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN74HC244NG4 FAQ
1.How can I place an order for SN74HC244NG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC244NG4 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 SN74HC244NG4 reliable?
The price and inventory of SN74HC244NG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC244NG4 is usually 5 days.
3.What payment methods are accepted for SN74HC244NG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC244NG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC244NG4?
SN74HC244NG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC244NG4 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 SN74HC244NG4?
For technical support, including SN74HC244NG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC244NG4 requirements.
6.How does Aetrix verify that SN74HC244NG4 is sourced from the original manufacturer or authorized distributors?
All SN74HC244NG4 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 SN74HC244NG4 meets industry standards.
7.What is the process for return or replacement of SN74HC244NG4?
All SN74HC244NG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC244NG4, 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 SN74HC244NG4 part is unused and in its original packaging.
Return procedure for SN74HC244NG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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