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Texas Instruments SN74AHCT244PWRE4
- Part No.:
- SN74AHCT244PWRE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHCT244PWRE4.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,941
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Product details
Overview
SN74AHCT244PWRE4 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 ns typical propagation delay (CL = 15 pF), and operates from –40°C to 85°C. It enables bidirectional data isolation in PC motherboard I/O expansion and industrial control backplanes.
For engineers reviewing the SN74AHCT244PWRE4 datasheet, SN74AHCT244PWRE4 pinout, SN74AHCT244PWRE4 application, or SN74AHCT244PWRE4 equivalent, this page delivers verified functional mode behavior, real-world thermal resistance (RθJA = 116.8°C/W), input overvoltage tolerance up to 5.5 V, and confirmed TSSOP-20 package compatibility with JEDEC-standard PCB layout practices.
Technical Context
The SN74AHCT244PWRE4 implements two independent 4-bit non-inverting buffers, each controlled by a dedicated 3-state output-enable input (1OE, 2OE). Its CMOS design with TTL-level input thresholds allows seamless interfacing between 3.3-V logic sources and 5-V buses without level shifters.
Each buffer section drives one direction only: inputs A1–A4 feed outputs Y1–Y4 under 1OE control; inputs A1'–A4' feed outputs Y1'–Y4' under 2OE control. Output enable asserts low to enable, high to enter high-impedance state - critical for bus contention avoidance in shared-data-path architectures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures stable operation across standard 5-V rail tolerances in industrial PCs and network infrastructure. |
| Output Drive | ±8 mA - sufficient for driving multiple CMOS loads or short PCB traces without signal integrity degradation. |
| Propagation Delay | 5.4 ns (min) / 8.5 ns (max) at CL = 15 pF - supports >100 MHz bus timing margins in synchronous peripheral interfaces. |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - guarantees reliable recognition of TTL-family logic levels from legacy controllers or FPGAs. |
| Junction-to-Ambient RθJA | 116.8°C/W (TSSOP-20) - defines thermal derating limit for continuous operation at ambient ≤ 85°C with no forced airflow. |
| ESD Rating | ±2000 V HBM - meets standard handling requirements for automated assembly in Class 0–1 ESD environments. |
| Operating Temperature | –40°C to +85°C - qualified for commercial/industrial temperature range applications including power infrastructure monitoring. |
Pinout & Package
TSSOP-20 (PW) package: 6.50 mm × 6.40 mm body size, 0.65 mm lead pitch, thin-profile surface-mount construction optimized for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output enable controls for Group 1 (pins 2–9, 18) and Group 2 (pins 11–17, 12) respectively. |
| 2, 4, 6, 8 | 1A1–1A4 | Group 1 input signals routed to Y1–Y4 when 1OE = L. |
| 3, 5, 7, 9 | 2Y4–2Y1 | Group 2 outputs driven by 2A1–2A4 when 2OE = L; pin order reflects reversed physical mapping per TI schematic. |
| 10 | GND | Reference ground for all logic and power domains; must be low-impedance connection to minimize noise coupling. |
| 11, 13, 15, 17 | 2A1–2A4 | Group 2 input signals routed to 2Y1–2Y4 when 2OE = L. |
| 12, 14, 16, 18 | 1Y4–1Y1 | Group 1 outputs driven by 1A1–1A4 when 1OE = L; pin numbering follows descending Y-order per TI pin diagram. |
| 20 | VCC | +5 V supply input; requires local 0.1 µF ceramic bypass capacitor placed within 3 mm of pin per 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 translators in mixed-voltage systems. |
| Slow edge rate control | Minimizes output ringing and EMI on unterminated traces - critical for clean signal integrity in compact wearable health device PCBs. |
| High-impedance outputs | Enables true bus sharing without contention - supports hot-swap-capable I/O expansion in modular test equipment. |
| Overvoltage-tolerant inputs | Withstands VI up to 5.5 V regardless of VCC - protects against transient overshoot during power sequencing in multi-rail systems. |
| Latch-up immunity | Exceeds 250 mA per JESD17 - ensures robustness against accidental ground-bounce or supply collapse events in industrial environments. |
Applications
| PC Motherboard I/O Expansion | Industrial PLC Backplane Interface |
|---|---|
|
Use Scenario: Isolating legacy ISA-style peripheral slots from modern southbridge logic while maintaining signal integrity across 10+ cm traces. IC Role / Device Role / Timing Role: Bidirectional 3-state buffer enabling dynamic bus arbitration between CPU and add-in cards. Use Value: Prevents bus contention during hot-plug events and reduces crosstalk via controlled slew rates - validated in TI reference designs for embedded x86 platforms. |
Use Scenario: Interfacing microcontroller GPIO banks to isolated 24-V field I/O modules in factory automation cabinets. IC Role / Device Role / Timing Role: Level-shifting and current-boosting buffer for driving optocoupler inputs and relay drivers. Use Value: Eliminates need for discrete transistor arrays; TTL-compatible inputs accept direct MCU outputs, reducing BOM count by 4–6 components per channel. |
| Network Switch Control Plane | Wearable Health Sensor Hub |
|
Use Scenario: Managing configuration registers and status reporting lines between switch ASIC and management MCU over shared SMBus. IC Role / Device Role / Timing Role: Direction-controlled data isolator preventing backfeed from powered-down subsystems. Use Value: Enables safe firmware updates without full system reset - leverages OE-controlled high-Z state to decouple domains during reconfiguration. |
Use Scenario: Aggregating analog sensor ADC outputs and digital motion processor data onto a single SPI bus to main application processor. IC Role / Device Role / Timing Role: Low-power 3-state multiplexer enabling time-division sharing of serial interface pins. Use Value: Reduces PCB layer count by consolidating interconnects; 8.2 pF typical power dissipation capacitance minimizes active current draw in battery-constrained devices. |
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); 24 mA drive; 3.3-V native logic - not 5-V compatible. | Suitable only for 3.3-V systems; cannot replace SN74AHCT244PWRE4 in 5-V bus environments. | Select only if migrating entire system to 3.3 V; verify VIH/VIL compatibility with upstream drivers. |
| 74ACT244SCX | Higher drive (±24 mA); faster tPLH/tPHL (3.5 ns typ); same 5-V operation and TSSOP-20 footprint. | Better suited for high-speed backplanes but increases EMI risk without careful termination. | Prefer when >100 MHz timing margins required; add series damping resistors to match SN74AHCT244PWRE4's controlled edge behavior. |
Compared with SN74LVC244APWR and 74ACT244SCX, the SN74AHCT244PWRE4 uniquely balances TTL compatibility, 5-V operation, and low-noise edge control - making it optimal for legacy-interfaced industrial and computing systems where signal integrity and voltage translation coexist.
Availability
SN74AHCT244PWRE4 is available at Aetrix Electronics and suitable for PC motherboard I/O expansion, industrial PLC backplane interface, and wearable health sensor hub applications requiring stable component supply across extended production lifecycles.
Supply support for SN74AHCT244PWRE4 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 connectivity technologies with over 50 years of innovation in logic and interface solutions.
The SN74AHCT244PWRE4 belongs to TI's AHCT logic family - engineered for 5-V systems requiring TTL-input compatibility, low power consumption, and robust bus-driving capability in commercial and industrial environments.
FAQ
What is the maximum operating temperature for SN74AHCT244PWRE4?
The SN74AHCT244PWRE4 is rated for operation from –40°C to +85°C. This temperature range is specified in the Recommended Operating Conditions table of the official datasheet and applies to the TSSOP-20 (PW) package variant. Thermal derating is required above 85°C ambient due to its RθJA of 116.8°C/W.
Does SN74AHCT244PWRE4 support 3.3-V input logic levels?
Yes, SN74AHCT244PWRE4 accepts 3.3-V inputs reliably because its VIH threshold is 2.0 V (min) and VIL is 0.8 V (max) at VCC = 4.5–5.5 V. This allows direct interfacing with 3.3-V microcontrollers and FPGAs without level-shifting circuitry - a key feature documented in Section 7.3 of the datasheet.
Can SN74AHCT244PWRE4 be used in place of SN74AHCT244PWR?
Yes, SN74AHCT244PWRE4 is functionally and pin-compatible with SN74AHCT244PWR. Both are TSSOP-20 packaged variants of the same AHCT244 logic device. The "E4" suffix denotes TI's green packaging standard (lead-free, RoHS-compliant), with identical electrical specs and thermal characteristics.
What is the recommended bypass capacitor for SN74AHCT244PWRE4?
Texas Instruments recommends a 0.1 µF ceramic capacitor placed as close as possible to the VCC pin (pin 20) of the SN74AHCT244PWRE4. Layout guidelines in Section 8.2 specify that the capacitor should be installed within 3 mm of the pin to suppress high-frequency noise and maintain stable supply voltage during output switching transitions.
How does the output-enable logic work on SN74AHCT244PWRE4?
SN74AHCT244PWRE4 uses active-low output-enable inputs: 1OE (pin 1) controls Group 1 outputs (1Y1–1Y4), and 2OE (pin 19) controls Group 2 outputs (2Y1–2Y4). When either OE is low, corresponding outputs follow their A-inputs; when high, outputs enter high-impedance state - enabling safe bus sharing as defined in Table 7-1 of the datasheet.
SN74AHCT244PWRE4 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
SN74AHCT244PWRE4 FAQ
1.How can I place an order for SN74AHCT244PWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT244PWRE4 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 SN74AHCT244PWRE4 reliable?
The price and inventory of SN74AHCT244PWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT244PWRE4 is usually 5 days.
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4.How is shipping managed for SN74AHCT244PWRE4?
SN74AHCT244PWRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT244PWRE4 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 SN74AHCT244PWRE4?
For technical support, including SN74AHCT244PWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT244PWRE4 requirements.
6.How does Aetrix verify that SN74AHCT244PWRE4 is sourced from the original manufacturer or authorized distributors?
All SN74AHCT244PWRE4 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 SN74AHCT244PWRE4 meets industry standards.
7.What is the process for return or replacement of SN74AHCT244PWRE4?
All SN74AHCT244PWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT244PWRE4, 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 SN74AHCT244PWRE4 part is unused and in its original packaging.
Return procedure for SN74AHCT244PWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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