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Texas Instruments SN74AHCT244QPWRQ1
- Part No.:
- SN74AHCT244QPWRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHCT244QPWRQ1.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,493
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Product details
Overview
SN74AHCT244QPWRQ1 from Texas Instruments is an automotive-qualified octal buffer/driver with 3-state outputs, designed for bus-oriented receivers and transmitters in memory-address and clock driver applications. It features TTL-compatible inputs, ±8 mA output drive at 5 V, 7.4 ns typical propagation delay (CL = 15 pF), and operates from −40°C to +125°C.
For engineers reviewing the SN74AHCT244QPWRQ1 datasheet, SN74AHCT244QPWRQ1 pinout, SN74AHCT244QPWRQ1 application, or SN74AHCT244QPWRQ1 equivalent, key selection considerations include its dual 4-bit independent enable architecture, 3-state output isolation, automotive AEC-Q100 qualification, and TSSOP-20 packaging for space-constrained ECUs and body control modules.
Technical Context
The SN74AHCT244QPWRQ1 implements two independent 4-bit noninverting buffers, each controlled by a dedicated output-enable input (1OE and 2OE). Its EPIC™ CMOS process ensures TTL-level input compatibility while maintaining CMOS power efficiency and noise immunity.
Each buffer section drives up to eight LSTTL loads with rail-to-rail output swing (VOH ≥ 3.94 V, VOL ≤ 0.44 V at IOL/IOH = ±8 mA) and supports fast switching (tPLH/tPHL ≤ 8.5 ns) under 5 V ±0.5 V supply conditions with 15 pF load capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures stable operation across automotive battery voltage fluctuations including cold-crank conditions. |
| Output Drive | ±8 mA - Sufficient to directly drive eight standard LSTTL inputs without external buffering. |
| Propagation Delay | 7.4 ns typical (A→Y, CL = 15 pF) - Enables reliable timing in high-speed address/data bus applications up to ~100 MHz. |
| 3-State Enable Time | tPZH/tPZL = 10.4 ns max (OE→Y, CL = 15 pF) - Provides precise bus arbitration control during multi-master transitions. |
| Input Compatibility | TTL-voltage compatible (VIH = 2 V, VIL = 0.8 V) - Interfaces directly with legacy 5 V TTL logic without level-shifting circuitry. |
| Operating Temperature | −40°C to +125°C - Qualified per AEC-Q100 Grade 1 for under-hood and powertrain control unit deployment. |
| ESD Rating | ±1000 V HBM - Meets automotive ESD robustness requirements for assembly and field reliability. |
Pinout & Package
TSSOP-20 package (PW), 6.50 mm × 6.40 mm body size, 1.2 mm maximum height, lead pitch 0.65 mm, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output enables - Independently control Y-group outputs; tie high via pullup for safe power-up high-impedance state. |
| 2, 4, 6, 8, 11, 13, 15, 17 | 1A1–1A4, 2A1–2A4 | Buffer input terminals - Accept TTL-compatible signals; all unused inputs must be tied to VCC or GND. |
| 3, 5, 7, 9, 12, 14, 16, 18 | 2Y4–2Y1, 1Y4–1Y1 | 3-state output terminals - Provide bidirectional bus isolation; high-impedance when corresponding OE is high. |
| 10 | GND | Ground reference - Required low-impedance return path for all logic and output currents. |
| 20 | VCC | Power supply - Must be bypassed with 0.1 μF ceramic capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Grade 1 (−40°C to +125°C) - Certified for automotive safety-critical systems including engine control and ADAS sensor interfaces. |
| Dual independent 3-state control | Separate 1OE and 2OE pins - Enables selective isolation of two 4-bit data lanes on shared buses without cross-talk. |
| TTL-compatible inputs | VIH = 2 V, VIL = 0.8 V - Eliminates need for external level shifters when interfacing with legacy 5 V microcontrollers and FPGAs. |
| Low dynamic power | ICC = 40 μA max (VCC = 5.5 V) - Reduces quiescent current in always-on vehicle networks such as CAN gateway modules. |
| Enhanced noise immunity | VIH(D)/VIL(D) = 2 V / 0.8 V (dynamic) - Maintains reliable logic thresholds under fast-edge, high-noise automotive EMI environments. |
Applications
| Automotive Body Control Module (BCM) | Engine Control Unit (ECU) Address Buffering |
|---|---|
Use Scenario: Isolating microcontroller GPIOs from high-current door lock actuators and lighting drivers. IC Role / Device Role: Octal buffer providing galvanic separation and current gain between MCU I/O and load-driving transistors. Use Value: Prevents MCU pin damage during inductive load switching transients while enabling single-chip control of eight independent functions. | Use Scenario: Driving multiplexed memory address lines in legacy 8-bit engine management microcontrollers. IC Role / Device Role: Address line driver with 3-state capability to support shared bus arbitration between CPU and diagnostic interface. Use Value: Enables clean address signal integrity over 10+ cm PCB traces at 20 MHz clock rates without added termination or repeaters. |
| Instrument Cluster Display Interface | ADAS Camera Sensor Data Conditioning |
Use Scenario: Debouncing mechanical switch inputs (e.g., mode select, backlight dimmer) before feeding to display controller. IC Role / Device Role: Digital signal conditioner that eliminates contact bounce artifacts using synchronous sampling and output hold. Use Value: Removes false trigger events in safety-critical UI navigation without requiring firmware-based debouncing algorithms. | Use Scenario: Level-shifting and buffering parallel pixel data from image sensors to SoC video input ports. IC Role / Device Role: Signal integrity enhancer that restores edge rate and noise margin on 8-bit parallel LVCMOS video streams. Use Value: Supports error-free 30 fps VGA capture by maintaining <1 ns skew across all eight data lines under EMI stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC244APWR | 3.3 V only (1.65–3.6 V), lower drive (±24 mA), faster tPD (3.7 ns), non-automotive grade | Suitable for 3.3 V industrial or consumer systems; lacks AEC-Q100 qualification and 5 V tolerance | Select when operating exclusively at 3.3 V and automotive qualification is not required. |
| SN74AHCT244QDWRQ1 | SOIC-20 package (12.8 mm × 10.3 mm), same electrical specs and AEC-Q100 Grade 1 rating | Better thermal performance (RθJA = 58°C/W vs. 116.8°C/W) but requires larger PCB area | Choose for higher-power-density designs where board space permits larger footprint and improved heat dissipation. |
Compared with SN74LVC244APWR, SN74AHCT244QPWRQ1 provides 5 V system compatibility and automotive qualification at the cost of slightly slower speed; compared with SN74AHCT244QDWRQ1, it trades thermal performance for compact TSSOP packaging-critical for modern ECU miniaturization.
Availability
SN74AHCT244QPWRQ1 is available at Aetrix Electronics and suitable for automotive body control modules, engine control units, instrument cluster interfaces, and ADAS sensor conditioning circuits requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74AHCT244QPWRQ1 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 automotive-grade logic solutions with over 50 years of automotive qualification experience.
The SN74AHCT244QPWRQ1 belongs to TI's automotive logic portfolio, engineered specifically for robust signal buffering and bus isolation in harsh-temperature, high-reliability vehicle subsystems.
FAQ
What is the maximum operating temperature range for the SN74AHCT244QPWRQ1?
The SN74AHCT244QPWRQ1 is rated for operation from −40°C to +125°C and is qualified per AEC-Q100 Grade 1. This specification is confirmed in Section 5.3 of the official datasheet and applies to the SN74AHCT244QPWRQ1 in TSSOP-20 packaging. The device maintains full electrical performance across this range, including propagation delay, output drive, and noise margins.
Does the SN74AHCT244QPWRQ1 support 3.3 V logic inputs?
No, the SN74AHCT244QPWRQ1 does not guarantee reliable operation with 3.3 V logic inputs. Its input thresholds are TTL-compatible (VIH = 2.0 V min, VIL = 0.8 V max) and specified only for VCC = 4.5–5.5 V operation. Applying 3.3 V signals risks marginal VIH margin and undefined behavior; use SN74LVC244A for true 3.3 V–5 V mixed-voltage systems.
How should unused inputs be handled on the SN74AHCT244QPWRQ1?
All unused inputs on the SN74AHCT244QPWRQ1 must be tied to either VCC or GND to prevent floating states that cause increased ICC, noise susceptibility, or erratic output behavior. Section 5.3 and Application Note SCBA004 explicitly require this. For example, unused A-inputs should connect to VCC via 10 kΩ resistors or directly to GND depending on desired default logic level.
Is the SN74AHCT244QPWRQ1 pin-compatible with the commercial-grade SN74AHCT244?
Yes, the SN74AHCT244QPWRQ1 shares identical pinout, functionality, and AC/DC specifications with the catalog SN74AHCT244 in TSSOP-20 (PW) packaging. The Q1 suffix denotes automotive qualification (AEC-Q100), enhanced test coverage, and extended temperature support-but no physical or electrical pinout changes. Layouts designed for SN74AHCT244 can be reused for SN74AHCT244QPWRQ1.
What is the recommended bypass capacitor for the SN74AHCT244QPWRQ1 VCC pin?
Texas Instruments recommends a 0.1 μF ceramic capacitor placed as close as possible to the VCC pin (Pin 20) of the SN74AHCT244QPWRQ1. This value is specified in Section 8.1 of the datasheet for single-supply devices. For improved high-frequency noise rejection, pairing it with a 1 μF bulk capacitor in parallel is acceptable, provided both are routed with minimal loop inductance.
SN74AHCT244QPWRQ1 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:
- 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:
- 8mA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74AHCT244QPWRQ1 FAQ
1.How can I place an order for SN74AHCT244QPWRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT244QPWRQ1 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 SN74AHCT244QPWRQ1 reliable?
The price and inventory of SN74AHCT244QPWRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT244QPWRQ1 is usually 5 days.
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Once your SN74AHCT244QPWRQ1 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 SN74AHCT244QPWRQ1?
For technical support, including SN74AHCT244QPWRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT244QPWRQ1 requirements.
6.How does Aetrix verify that SN74AHCT244QPWRQ1 is sourced from the original manufacturer or authorized distributors?
All SN74AHCT244QPWRQ1 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 SN74AHCT244QPWRQ1 meets industry standards.
7.What is the process for return or replacement of SN74AHCT244QPWRQ1?
All SN74AHCT244QPWRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT244QPWRQ1, 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 SN74AHCT244QPWRQ1 part is unused and in its original packaging.
Return procedure for SN74AHCT244QPWRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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