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Texas Instruments SN74AHCT244IPWRQ1
- Part No.:
- SN74AHCT244IPWRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHCT244IPWRQ1.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:748
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Product details
Overview
SN74AHCT244IPWRQ1 from Texas Instruments is an automotive-qualified octal buffer/driver with 3-state outputs, designed for bus-oriented signal routing 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 across −40°C to +85°C.
For engineers reviewing the SN74AHCT244IPWRQ1 datasheet, SN74AHCT244IPWRQ1 pinout, SN74AHCT244IPWRQ1 application, or SN74AHCT244IPWRQ1 equivalent, key selection criteria include 3-state bus isolation capability, automotive temperature range compliance, SOIC/TSSOP package compatibility, and input voltage tolerance up to 5.5 V.
Technical Context
The SN74AHCT244IPWRQ1 implements two independent 4-bit noninverting buffers, each controlled by a dedicated output-enable (OE) input. Its EPIC™ CMOS process ensures TTL-level input compatibility while maintaining CMOS power efficiency and noise immunity.
Each buffer section drives high-impedance outputs when its OE is high, enabling bidirectional bus control without contention. Input thresholds are fixed at VIH = 2 V and VIL = 0.8 V, supporting direct interfacing with legacy TTL logic without level-shifting circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures stable operation under automotive battery rail variations including cold-crank conditions. |
| Output Drive | ±8 mA - Sufficient to drive standard 50-pF loads on PCB traces or multiple CMOS inputs without signal degradation. |
| Propagation Delay | 7.4 ns typ. (CL = 15 pF) - Enables reliable timing in high-speed address/data bus applications up to ~100 MHz. |
| Input Compatibility | TTL-voltage compatible (VIH = 2 V, VIL = 0.8 V) - Directly interfaces with 5-V TTL logic families without external biasing. |
| ESD Rating | ±1000 V HBM - Meets automotive ESD robustness requirements per MIL-STD-883 Method 3015. |
| Operating Temperature | −40°C to +85°C - Qualified for passenger compartment and engine bay–adjacent electronics per AEC-Q100. |
| Quiescent Current | 40 μA max - Supports low-power system states without compromising bus isolation integrity. |
Pinout & Package
TSSOP-20 (PW) package: 6.50 mm × 6.40 mm body size, 1.2 mm max height, lead pitch 0.65 mm, RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1 OE / 2 OE | Active-low enable controls first/second 4-bit buffer group; tie high via pullup for safe power-up high-Z state. |
| 2, 4, 6, 8, 11, 13, 15, 17 | A Inputs (1A1–1A4, 2A1–2A4) | Eight TTL-compatible data inputs; unused pins must be tied to VCC or GND to prevent floating logic states. |
| 3, 5, 7, 9, 12, 14, 16, 18 | Y Outputs (2Y4–2Y1, 1Y4–1Y1) | Eight 3-state outputs; high-impedance when corresponding OE is high, eliminating bus contention during reset or standby. |
| 10 | GND | Ground reference for all logic and output stages; requires low-inductance connection to system ground plane. |
| 20 | VCC | 5-V supply input; requires local 0.1-μF ceramic bypass capacitor placed within 3 mm of pin for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 2 qualified (−40°C to +125°C ambient), with production test coverage for automotive reliability. |
| 3-state bus isolation | Dual independent OE inputs allow selective disabling of either 4-bit channel, enabling flexible memory or peripheral bus partitioning. |
| TTL-compatible inputs | Accepts standard 5-V TTL logic levels (VIH ≥ 2 V, VIL ≤ 0.8 V), eliminating need for external level translators in mixed-logic systems. |
| Enhanced noise immunity | EPIC™ CMOS process provides 1 ns typical output skew and 4.1 V dynamic VOH at CL = 50 pF, ensuring clean signal edges in noisy environments. |
| Low static power | ICC ≤ 40 μA at VCC = 5.5 V - minimizes quiescent current draw in always-on vehicle modules such as body controllers. |
Applications
| Automotive Body Control Module (BCM) | Infotainment System Memory Interface |
|---|---|
Use Scenario: Isolating microcontroller GPIOs from door lock actuators and window motor drivers during MCU reset sequences. IC Role / Device Role / Timing Role: 3-state buffer providing glitch-free signal hold and bus decoupling during controller initialization. Use Value: Prevents unintended actuator activation by holding control lines in defined high-Z state until firmware takes full control. | Use Scenario: Driving address lines between SoC and external NOR flash in head unit design. IC Role / Device Role / Timing Role: Address bus driver with TTL-compatible inputs matching SoC output levels and driving capability for 50-pF trace loads. Use Value: Enables reliable 100-MHz address strobing without signal reflection or timing margin loss due to load mismatch. |
| Instrument Cluster Display Interface | ADAS Camera Sensor Data Multiplexing |
Use Scenario: Enabling/disabling SPI communication lines between MCU and TFT display controller based on display power state. IC Role / Device Role / Timing Role: Bidirectional bus gate managing SPI clock and data paths during display sleep/wake transitions. Use Value: Eliminates cross-talk and false triggering on shared SPI lines when display is powered down, improving system EMC performance. | Use Scenario: Selectively routing LVDS or parallel camera sensor outputs to image processor based on active camera input. IC Role / Device Role / Timing Role: Signal selector using dual OE control to isolate inactive camera data lanes and reduce capacitive loading on active path. Use Value: Maintains signal integrity on active video path by removing stub capacitance from disabled sensors, preserving rise/fall time specs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHCT244QPWRQ1 | Same functionality and pinout; rated for −40°C to +125°C operating range instead of −40°C to +85°C. | Suitable for under-hood applications requiring extended temperature support. | Select SN74AHCT244QPWRQ1 when ambient temperatures exceed 85°C, e.g., near engine control units or power inverters. |
| SN74LVC244APWR | Lower VCC range (1.65–3.6 V), 24-mA drive, no automotive qualification; uses different input threshold logic (VIL = 0.7×VCC). | Intended for portable or low-voltage industrial systems, not automotive safety-critical domains. | Choose SN74LVC244APWR only for non-automotive designs where 3.3-V operation and higher drive strength are prioritized over AEC-Q100 compliance. |
Compared with SN74AHCT244QPWRQ1, the SN74AHCT244IPWRQ1 offers identical electrical behavior but reduced thermal rating-making it suitable for cabin-mounted modules. Versus SN74LVC244APWR, it delivers guaranteed 5-V TTL interoperability and automotive qualification, at the cost of lower maximum drive current.
Availability
SN74AHCT244IPWRQ1 is available at Aetrix Electronics and suitable for automotive body control, infotainment memory interface, instrument cluster display management, and ADAS sensor multiplexing requiring stable component supply across production lifecycles.
Supply support for SN74AHCT244IPWRQ1 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 industry experience.
The SN74AHCT244IPWRQ1 belongs to TI's automotive-qualified AHCT logic family, engineered specifically for robust 5-V bus buffering in harsh-temperature vehicle subsystems where signal integrity and long-term reliability are critical.
FAQ
What is the maximum operating temperature for the SN74AHCT244IPWRQ1?
The SN74AHCT244IPWRQ1 is rated for operation from −40°C to +85°C ambient temperature. This specification applies to the I-suffix variant indicated in the orderable part number and is validated per AEC-Q100 stress testing protocols for automotive use cases including cabin electronics and body control modules.
Does the SN74AHCT244IPWRQ1 support 3.3-V input signals?
No, the SN74AHCT244IPWRQ1 does not reliably accept 3.3-V logic inputs. Its input thresholds are fixed at VIH = 2.0 V and VIL = 0.8 V, optimized for 5-V TTL compatibility. Applying 3.3-V signals may result in marginal or undefined switching behavior; use SN74LVC244APWR for guaranteed 3.3-V operation.
How should unused inputs be handled on the SN74AHCT244IPWRQ1?
All unused inputs on the SN74AHCT244IPWRQ1 must be tied to either VCC or GND to prevent floating states that cause increased ICC, noise susceptibility, or erratic output behavior. TI recommends connecting unused A inputs directly to VCC or GND using short PCB traces, not left open or capacitively coupled.
Is the SN74AHCT244IPWRQ1 pin-compatible with the commercial SN74AHCT244?
Yes, the SN74AHCT244IPWRQ1 shares identical pinout, electrical characteristics, and functional behavior with the commercial SN74AHCT244, differing only in automotive qualification, screening, and temperature rating. No PCB layout changes are required when upgrading from the catalog version to this AEC-Q100–qualified variant.
What is the recommended bypass capacitor for the SN74AHCT244IPWRQ1 VCC pin?
Texas Instruments specifies a 0.1-μF ceramic capacitor placed within 3 mm of the VCC pin (Pin 20) as the minimum requirement. For improved high-frequency noise suppression, a parallel combination of 0.1 μF and 1 μF capacitors is recommended, with both mounted as close as possible to the TSSOP-20 package.
SN74AHCT244IPWRQ1 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 ~ 85°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74AHCT244IPWRQ1 FAQ
1.How can I place an order for SN74AHCT244IPWRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT244IPWRQ1 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 SN74AHCT244IPWRQ1 reliable?
The price and inventory of SN74AHCT244IPWRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT244IPWRQ1 is usually 5 days.
3.What payment methods are accepted for SN74AHCT244IPWRQ1?
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4.How is shipping managed for SN74AHCT244IPWRQ1?
SN74AHCT244IPWRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT244IPWRQ1 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 SN74AHCT244IPWRQ1?
For technical support, including SN74AHCT244IPWRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT244IPWRQ1 requirements.
6.How does Aetrix verify that SN74AHCT244IPWRQ1 is sourced from the original manufacturer or authorized distributors?
All SN74AHCT244IPWRQ1 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 SN74AHCT244IPWRQ1 meets industry standards.
7.What is the process for return or replacement of SN74AHCT244IPWRQ1?
All SN74AHCT244IPWRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT244IPWRQ1, 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 SN74AHCT244IPWRQ1 part is unused and in its original packaging.
Return procedure for SN74AHCT244IPWRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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