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Texas Instruments SN74AC244NE4
- Part No.:
- SN74AC244NE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74AC244NE4.pdf
- Description:
- 8-CH, 2-V TO 6-V BUFFERS WITH 3-
- Quantity:
- Payment:
- Shipping:
Inventory:2,767
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Product details
Overview
SN74AC244NE4 from Texas Instruments is an octal 3-state buffer/driver IC designed for bus-oriented data transmission, clock distribution, and memory address driving in industrial and telecom systems. It operates from 2V to 6V VCC, supports 5V logic compatibility, delivers ≤7.5ns propagation delay at 5V, and features dual independent output-enable controls (1OE, 2OE) for flexible bus management in server backplanes and LED display controllers.
For engineers reviewing the SN74AC244NE4 datasheet, SN74AC244NE4 pinout, SN74AC244NE4 application, or SN74AC244NE4 equivalent, this page provides verified functional modes, thermal resistance (69°C/W), input voltage tolerance up to 6V, 20-pin PDIP package dimensions (24.33mm × 9.4mm), and real-world use cases in motor-drive control boards and network switch data paths.
Technical Context
The SN74AC244NE4 implements two independent 4-bit non-inverting buffer sections, each with dedicated 3-state output-enable inputs (1OE and 2OE). Its CMOS AC logic family ensures rail-to-rail input voltage acceptance (0–6V) regardless of VCC level, enabling mixed-voltage interface bridging between 3.3V and 5V subsystems.
Each buffer section drives up to ±24mA output current at 5V while maintaining guaranteed VOH ≥ 3.7V and VOL ≤ 0.44V under load - critical for noise-immune signal integrity in high-density PCB layouts used in telecom infrastructure and industrial I/O modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 6V - enables interoperability across 3.3V and 5V logic domains without level shifters |
| Max tpd | 7.5ns at 5V - supports >100MHz bus timing margins in high-speed control applications |
| IOH/IOL | ±24mA at 5V - drives standard TTL loads and multiple CMOS inputs without external buffering |
| Input Voltage Tolerance | 0V to 6V - accepts overvoltage-safe signals from legacy 5V peripherals interfacing with 3.3V microcontrollers |
| Thermal Resistance θJA | 69°C/W (PDIP) - allows sustained operation at full drive strength in ambient temperatures up to +85°C |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded systems including motor-drive control boards |
| Output Enable Logic | Active-low (1OE, 2OE) - simplifies direct connection to microcontroller GPIO pins without inverters |
Pinout & Package
SN74AC244NE4 uses a 20-pin Plastic Dual In-line Package (PDIP-N) with body size 24.33mm × 6.35mm and overall footprint 24.33mm × 9.4mm. Pin 1 is located at the left end of the top row, identified by a notch or dot marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE | Active-low output enable for Y1–Y4 | Drives all four outputs (1Y1–1Y4) into high-impedance when high; ties directly to MCU GPIO for software-controlled bus isolation |
| 2OE | Active-low output enable for Y5–Y8 | Enables independent gating of second buffer bank - essential for bidirectional bus arbitration in server memory modules |
| 1A1–1A4, 2A1–2A4 | Buffer input terminals | Eight total inputs accepting 0–6V signals; no internal pullups - requires external biasing for unused pins per TI SCBA004 |
| 1Y1–1Y4, 2Y1–2Y4 | Non-inverting 3-state outputs | Drive bus lines with ±24mA sink/source capability; high-Z state prevents contention during multi-master arbitration |
| VCC (Pin 20) | Power supply | Single 2–6V supply powers both banks; bypass capacitor (0.1µF) required adjacent to pin for switching noise suppression |
| GND (Pin 10) | Ground reference | Common return path for all I/O and power currents; must be low-inductance connection to minimize ground bounce |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input voltage support | Accepts 0–6V inputs independent of VCC, enabling robust interfacing between mixed-voltage subsystems |
| Dual independent 3-state controls | Separate 1OE/2OE pins allow selective disabling of either 4-bit bank - critical for time-multiplexed bus sharing |
| Low propagation delay | 7.5ns max at 5V ensures tight timing alignment in clock distribution networks and synchronous data buses |
| High-output drive strength | ±24mA per output meets TTL fanout requirements and reduces need for external drivers in LED segment drivers |
| Industrial temperature range | –40°C to +85°C operation supports deployment in uncontrolled environments like telecom base stations and factory automation panels |
Applications
| Server Backplane Signal Buffering | LED Display Column Drivers |
|---|---|
Use Scenario: Isolating and strengthening address/data signals between CPU and memory modules on high-density server motherboards. IC Role / Device Role / Timing Role: Octal non-inverting buffer with dual OE control acts as bi-directional bus repeater, preventing loading-induced skew across 20+ inch traces. Use Value: 7.5ns tpd and ±24mA drive maintain signal integrity at DDR speeds while 3-state capability enables hot-swap memory module insertion. | Use Scenario: Driving common-anode LED digit segments in industrial panel meters and programmable logic controller (PLC) HMI displays. IC Role / Device Role / Timing Role: High-current sink driver for 8-segment LED columns, controlled via microcontroller GPIO and OE pins for multiplexed scanning. Use Value: 24mA per output eliminates need for discrete transistor arrays; 6V-tolerant inputs simplify interface with 5V display controllers. |
| Telecom Line Card Clock Distribution | Motor-Drive Control Board Data Latching |
Use Scenario: Distributing synchronized clock signals to multiple FPGA-based packet processing units on telecom line cards. IC Role / Device Role / Timing Role: Low-skew clock buffer with independent enable controls routes master clock to parallel processing lanes while supporting dynamic clock gating. Use Value: Matched tPLH/tPHL (≤7ns) minimizes inter-lane clock skew; 2–6V VCC range accommodates both 3.3V FPGAs and 5V PHY interfaces. | Use Scenario: Latching position feedback signals from rotary encoders and Hall-effect sensors in closed-loop servo motor controllers. IC Role / Device Role / Timing Role: 3-state buffer isolates sensor data bus during microcontroller ADC sampling cycles to prevent signal corruption. Use Value: High-impedance state (Z) eliminates bus contention during analog acquisition; 6V input tolerance handles encoder open-collector outputs directly. |
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 |
|---|---|---|---|
| SN74HC244N | Slower max tpd (21ns at 4.5V); lower drive (±7.8mA); narrower VCC range (2–6V same, but HC lacks 6V input tolerance) | Suitable only for low-speed industrial I/O where timing margin >20ns exists; not recommended for 5V-tolerant mixed-voltage designs | Select SN74HC244N only if cost sensitivity outweighs speed and interface flexibility requirements |
| SN74LVC244APWR | 3.3V-only VCC (1.65–3.6V); higher speed (tpd ≤ 5.2ns); smaller TSSOP-20 package (6.5mm × 4.4mm) | Optimized for modern low-voltage digital systems; incompatible with 5V buses unless level-shifted | Choose SN74LVC244APWR for space-constrained 3.3V designs requiring sub-5ns timing; avoid in legacy 5V infrastructure |
Compared with SN74HC244N and SN74LVC244APWR, SN74AC244NE4 uniquely balances 5V system compatibility, 7.5ns speed, and ±24mA drive in a through-hole PDIP package - making it the preferred choice for serviceable industrial control boards and telecom hardware requiring field-replaceable components.
Availability
SN74AC244NE4 is available at Aetrix Electronics and suitable for server backplane signal buffering, LED display column driving, and motor-drive control board data latching requiring stable component supply and long-term industrial lifecycle support.
Supply support for SN74AC244NE4 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 for industrial, automotive, and communications markets.
The SN74AC244NE4 belongs to TI's AC logic family, engineered for high-speed, low-power 3-state buffering in mixed-voltage digital systems - particularly targeting industrial control, telecom infrastructure, and legacy-compatible embedded designs.
FAQ
What is the maximum operating voltage for SN74AC244NE4 inputs?
The SN74AC244NE4 inputs accept voltages from 0V to 6V regardless of VCC level - a key feature enabling safe interfacing with 5V peripherals in 3.3V systems. This 6V tolerance is explicitly specified in the Recommended Operating Conditions table and verified across the full –40°C to +85°C temperature range. The SN74AC244NE4 does not require external clamping diodes for 5V signal inputs when powered from 3.3V.
Does SN74AC244NE4 support hot-swap bus isolation?
Yes, SN74AC244NE4 supports hot-swap bus isolation via its dual active-low output-enable inputs (1OE and 2OE). When either OE pin is driven high, its corresponding four outputs enter high-impedance state, electrically disconnecting that buffer bank from the bus. This allows live insertion/removal of memory modules or peripheral cards without disrupting other system functions - a capability validated in server backplane reference designs using SN74AC244NE4.
What is the thermal resistance (θJA) of SN74AC244NE4 in its PDIP package?
The SN74AC244NE4 in the 20-pin PDIP (N) package has a junction-to-ambient thermal resistance (θJA) of 69°C/W, as documented in Section 5.3 of the official datasheet. This value assumes standard JEDEC high-K test board conditions and confirms the device can dissipate up to 360mW continuously at +85°C ambient while staying within silicon thermal limits - sufficient for full-output operation in industrial control enclosures without forced airflow.
Can SN74AC244NE4 drive standard TTL loads directly?
Yes, SN74AC244NE4 can drive standard TTL loads directly. At VCC = 5V, it delivers IOL = 24mA (min) and IOH = –24mA (min), exceeding the TTL specification of IIL = –1.6mA and IIH = 40µA per input. Its VOH ≥ 3.76V and VOL ≤ 0.44V at 24mA load meet TTL VIH/VIL thresholds with margin. No series resistors or external drivers are needed when interfacing with 74LS or 74F-series logic.
Is SN74AC244NE4 pin-compatible with other members of the '244 family?
SN74AC244NE4 shares identical pinout and function mapping with SN74HC244N, SN74LS244N, and SN74LVC244APWR - all follow the industry-standard 20-pin DIP/SOIC/TSSOP layout defined in JEDEC MS-001. However, electrical characteristics differ: AC logic offers superior speed and drive vs. HC/LS, while LVC requires 3.3V-only supply. Mechanical compatibility enables drop-in replacement in existing PDIP footprints, but voltage and timing validation is required before substitution.
SN74AC244NE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- 24mA, 24mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN74AC244NE4 FAQ
1.How can I place an order for SN74AC244NE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AC244NE4 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 SN74AC244NE4 reliable?
The price and inventory of SN74AC244NE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AC244NE4 is usually 5 days.
3.What payment methods are accepted for SN74AC244NE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AC244NE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AC244NE4?
SN74AC244NE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AC244NE4 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 SN74AC244NE4?
For technical support, including SN74AC244NE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AC244NE4 requirements.
6.How does Aetrix verify that SN74AC244NE4 is sourced from the original manufacturer or authorized distributors?
All SN74AC244NE4 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 SN74AC244NE4 meets industry standards.
7.What is the process for return or replacement of SN74AC244NE4?
All SN74AC244NE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AC244NE4, 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 SN74AC244NE4 part is unused and in its original packaging.
Return procedure for SN74AC244NE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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