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Texas Instruments SN74ACT244IPWRQ1
- Part No.:
- SN74ACT244IPWRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74ACT244IPWRQ1.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,785
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Product details
Overview
SN74ACT244IPWRQ1 from Texas Instruments is an automotive-qualified octal 3-state buffer/driver IC designed for bus-oriented signal redriving and memory address buffering in safety-critical vehicle systems. It operates from 4.5 V to 5.5 V, supports TTL-compatible inputs up to 5.5 V, delivers ≤9 ns propagation delay at 5 V, and features dual independent output-enable controls (1OE, 2OE) for flexible channel grouping.
For engineers reviewing the SN74ACT244IPWRQ1 datasheet, SN74ACT244IPWRQ1 pinout, SN74ACT244IPWRQ1 application, or SN74ACT244IPWRQ1 equivalent, key selection criteria include its AEC-Q100 Grade 2 qualification (−40°C to +125°C), 24 mA output drive capability per channel, high-impedance state control timing (tPZH/tPLZ ≤ 10.5 ns), and compatibility with 20-pin TSSOP (PW) packaging for space-constrained automotive PCB layouts.
Technical Context
The SN74ACT244IPWRQ1 implements two independent 4-bit noninverting buffer sections, each with dedicated output-enable inputs (1OE and 2OE). Its logic function is strictly noninverting: when OE is low, Y = A; when OE is high, Y enters high-impedance state. No internal latching, inversion, or level-shifting is present.
It uses ACT (Advanced CMOS TTL-compatible) technology, ensuring input thresholds aligned with standard TTL (VIH = 2 V min, VIL = 0.8 V max at VCC = 5 V) while maintaining CMOS power efficiency (ICC ≤ 40 µA at 5.5 V). All inputs tolerate up to 5.5 V regardless of VCC, enabling mixed-voltage interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures stable operation across automotive battery voltage transients including cold-crank (down to ~4.5 V) and load-dump surges (up to 5.5 V). |
| tpd (Max) | 9 ns at 5 V - Enables reliable redriving of high-speed digital signals such as CAN FD auxiliary clocks or sensor data buses without introducing critical timing skew. |
| IOL / IOH | ±24 mA - Sufficient to directly drive 50 Ω transmission lines or multiple TTL loads without external amplification. |
| Input Voltage Range | 0 V to VCC + 0.5 V - Allows safe interfacing with 5 V logic even when VCC is at minimum 4.5 V, eliminating need for external level shifters. |
| tPZH / tPLZ | ≤10.5 ns - Guarantees fast, predictable entry into high-Z state during controller reset or bus arbitration, preventing bus contention. |
| ESD Rating | HBM ±2000 V - Meets AEC-Q100-002 requirements for robustness against electrostatic discharge in assembly and service environments. |
| Operating Temp | −40°C to +125°C - Qualified for under-hood and powertrain applications where ambient temperatures exceed standard industrial limits. |
Pinout & Package
TSSOP-20 (PW) package: 6.5 mm × 6.4 mm body size, 1.2 mm max height, 0.65 mm lead pitch, exposed thermal pad optional per layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 19 | Active-Low Output Enable (Group 1) | Controls Y1–Y4 outputs; tie high via pullup to ensure high-Z during power-up if bus isolation is required. |
| 2OE, 2 | Active-Low Output Enable (Group 2) | Controls Y5–Y8 outputs; enables independent gating of two 4-bit data lanes on shared bus. |
| 1A1–1A4, 2–4, 8 | Input Group 1 | Noninverting inputs for first four buffers; accept TTL/CMOS logic levels up to 5.5 V. |
| 2A1–2A4, 11, 13, 15, 17 | Input Group 2 | Noninverting inputs for second four buffers; electrically isolated from Group 1 except shared VCC/GND. |
| 1Y1–1Y4, 18, 16, 14, 12 | Output Group 1 | 3-state buffered outputs corresponding to 1A1–1A4; sink/source up to 24 mA each. |
| 2Y1–2Y4, 9, 5, 3, 20 | Output Group 2 | 3-state buffered outputs corresponding to 2A1–2A4; identical drive strength and timing to Group 1. |
| VCC, 20 | Power Supply | Single 4.5–5.5 V supply; requires local 0.1 µF bypass capacitor per device per TI layout guidance. |
| GND, 10 | Ground Reference | Common return path for all I/O and supply currents; must be low-impedance connection to system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Qualified | Grade 2 (−40°C to +125°C) - Validated for automotive powertrain, chassis, and ADAS subsystems requiring long-term reliability under thermal cycling and vibration. |
| 3-State Output Control | Dual independent OE pins (1OE, 2OE) - Enables selective bus isolation of two 4-bit channels without requiring external logic or multiplexers. |
| TTL-Compatible Inputs | VIH = 2 V min, VIL = 0.8 V max at 5 V - Interoperates directly with legacy microcontrollers, FPGAs, and ASICs using standard TTL signaling. |
| High-Speed Performance | tpd ≤ 9 ns, tPZH ≤ 10.5 ns - Supports signal integrity in 25+ MHz digital buses (e.g., SPI clock extension, sensor data aggregation). |
| Overvoltage-Tolerant Inputs | Accepts up to 5.5 V regardless of VCC - Simplifies interface with 5 V peripherals in 4.5–5.5 V supply domains without clamping diodes or resistors. |
Applications
| Drive Transmission Lines | Redrive Digital Signals |
|---|---|
Use Scenario: Driving a 50 Ω coaxial or PCB trace-based transmission line carrying sensor data from a remote camera module to an ADAS ECU. IC Role / Device Role / Timing Role: Signal redriver placed mid-line to restore edge integrity and compensate for attenuation and skew. Use Value: Delivers 24 mA drive strength and ≤9 ns tpd to maintain signal rise/fall times < 2 ns over 30 cm FR4 traces, meeting MIPI D-PHY timing margins. | Use Scenario: Re-broadcasting a low-drive-capability GPIO signal from a microcontroller to multiple downstream peripherals (e.g., LED drivers, solenoid controllers). IC Role / Device Role / Timing Role: Octal buffer isolating source from capacitive loading while preserving logic polarity and timing. Use Value: Eliminates signal degradation caused by >100 pF total load capacitance; ensures clean transitions at ≥10 MHz toggle rates. |
| Hold Signals During Reset | Drive Indicator LEDs |
Use Scenario: Maintaining valid bus states (e.g., CAN TX enable, LIN wake line) while the host MCU undergoes brown-out reset or firmware update. IC Role / Device Role / Timing Role: Bus hold buffer activated by reset controller's OE signal to freeze outputs in last-known state. Use Value: Prevents unintended actuator activation or communication errors during 10–100 ms reset windows using fast tPZH/tPLZ ≤ 10.5 ns transitions. | Use Scenario: Directly driving 20 mA indicator LEDs (e.g., status lights on instrument cluster PCB) from low-current MCU pins. IC Role / Device Role / Timing Role: Current-boosting buffer converting weak GPIO outputs into LED-sinking current paths. Use Value: Provides full 24 mA sink per channel at 0.44 V VOL, enabling bright LED illumination without external transistors or resistors beyond current-limiting. |
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), 3.3 V only; 24 mA drive but higher VOL (0.55 V @ 24 mA); not AEC-Q100 qualified. | Suitable for 3.3 V industrial or consumer boards; lacks automotive temperature and qualification support. | Select only for non-automotive 3.3 V designs where cost or footprint is prioritized over qualification. |
| SN74AHCT244QPWRQ1 | Same AEC-Q100 Grade 2 rating and pinout; slightly slower tpd (10.5 ns max); identical 4.5–5.5 V VCC and 24 mA drive. | Drop-in replacement for SN74ACT244IPWRQ1 where marginal speed reduction is acceptable. | Choose when sourcing flexibility is needed and 1.5 ns timing margin is available in system timing budget. |
Compared with SN74LVC244APWR and SN74AHCT244QPWRQ1, the SN74ACT244IPWRQ1 uniquely combines automotive qualification, 5 V operation, sub-10 ns speed, and overvoltage-tolerant inputs-making it the only option among the three validated for 5 V automotive bus redriving with guaranteed timing and reliability.
Availability
SN74ACT244IPWRQ1 is available at Aetrix Electronics and suitable for automotive infotainment head units, ADAS domain controllers, and body control modules requiring stable component supply across extended product lifecycles and temperature extremes.
Supply support for SN74ACT244IPWRQ1 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for automotive, industrial, personal electronics, and enterprise systems.
The SN74ACT244IPWRQ1 belongs to TI's automotive logic portfolio, engineered specifically to meet AEC-Q100 requirements for signal integrity, thermal resilience, and functional safety in vehicle networking and control subsystems.
FAQ
What is the maximum operating temperature for the SN74ACT244IPWRQ1?
The SN74ACT244IPWRQ1 is rated for operation from −40°C to +125°C and is AEC-Q100 Grade 2 qualified. This specification applies to the full automotive temperature range, making it suitable for under-hood and powertrain applications where ambient temperatures exceed standard industrial limits. The datasheet confirms this range under Recommended Operating Conditions (Section 5.3).
Does the SN74ACT244IPWRQ1 support 3.3 V logic inputs?
Yes, the SN74ACT244IPWRQ1 accepts input voltages from 0 V to VCC + 0.5 V, and its TTL-compatible input thresholds (VIH = 2 V min, VIL = 0.8 V max at VCC = 5 V) ensure reliable recognition of 3.3 V logic levels. However, it requires a 4.5–5.5 V VCC supply and does not operate at 3.3 V - so it functions as a level translator from 3.3 V inputs to 5 V bus domains.
Can unused inputs on the SN74ACT244IPWRQ1 be left floating?
No. All unused inputs on the SN74ACT244IPWRQ1 must be tied to either VCC or GND to prevent undefined operational states and potential increased ICC. TI explicitly states this requirement in Section 5.3 and Application Note SCBA004. Floating inputs may cause excessive current draw, noise susceptibility, or erratic output behavior due to intermediate voltage levels.
What is the recommended bypass capacitor for the SN74ACT244IPWRQ1?
Texas Instruments recommends a 0.1 µF ceramic bypass capacitor placed as close as possible to the VCC pin (Pin 20) and GND (Pin 10) of the SN74ACT244IPWRQ1. For optimal high-frequency noise suppression, pairing it with a 1 µF capacitor in parallel is common practice. Layout guidelines emphasize minimizing trace length between capacitor pads and device pins to reduce inductance.
Is the SN74ACT244IPWRQ1 pin-compatible with other members of the SN74ACT244-Q1 family?
Yes - the SN74ACT244IPWRQ1 shares identical pinout, functionality, and electrical specifications with other package variants of the SN74ACT244-Q1 family (e.g., SN74ACT244QDGSRQ1 in VSSOP and SN74ACT244QWRKSRQ1 in VQFN), provided the same 20-pin configuration is used. All variants implement dual 4-bit 3-state buffers with 1OE/2OE control and match switching characteristics within datasheet tolerances.
SN74ACT244IPWRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74ACT244IPWRQ1 FAQ
1.How can I place an order for SN74ACT244IPWRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT244IPWRQ1 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 SN74ACT244IPWRQ1 reliable?
The price and inventory of SN74ACT244IPWRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT244IPWRQ1 is usually 5 days.
3.What payment methods are accepted for SN74ACT244IPWRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT244IPWRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT244IPWRQ1?
SN74ACT244IPWRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT244IPWRQ1 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 SN74ACT244IPWRQ1?
For technical support, including SN74ACT244IPWRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT244IPWRQ1 requirements.
6.How does Aetrix verify that SN74ACT244IPWRQ1 is sourced from the original manufacturer or authorized distributors?
All SN74ACT244IPWRQ1 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 SN74ACT244IPWRQ1 meets industry standards.
7.What is the process for return or replacement of SN74ACT244IPWRQ1?
All SN74ACT244IPWRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT244IPWRQ1, 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 SN74ACT244IPWRQ1 part is unused and in its original packaging.
Return procedure for SN74ACT244IPWRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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