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Texas Instruments CAHCT244IPWRG4Q1
- Part No.:
- CAHCT244IPWRG4Q1
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
CAHCT244IPWRG4Q1.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,990
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Product details
Overview
CAHCT244IPWRG4Q1 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-voltage-compatible inputs, ±8 mA output drive at 5 V, 7.4 ns typical propagation delay (CL = 15 pF), and operates from −40°C to +85°C.
For engineers reviewing the CAHCT244IPWRG4Q1 datasheet, CAHCT244IPWRG4Q1 pinout, CAHCT244IPWRG4Q1 application, or CAHCT244IPWRG4Q1 equivalent, key selection considerations include its dual 4-bit 3-state architecture, automotive AEC-Q100 Grade 3 qualification, TSSOP-20 package, and compatibility with 5-V logic systems requiring noise-immune signal gating.
Technical Context
The CAHCT244IPWRG4Q1 implements two independent 4-bit non-inverting 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 rail-to-rail output swing.
Each buffer group supports high-impedance (Z) output states when OE is high, enabling bidirectional bus control without contention. Input thresholds are fixed at VIH = 2 V and VIL = 0.8 V, and switching performance is characterized across CL = 15 pF and CL = 50 pF loads with tPLH/tPHL ≤ 9.5 ns max at 5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures robust operation across automotive battery variations and ripple. |
| Output Drive | ±8 mA - Sufficient to drive standard 50-pF TTL/CMOS loads without external buffering. |
| 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 - Accepts 0.8 V / 2.0 V logic thresholds directly from legacy 5-V TTL sources. |
| ESD Rating | ±1000 V HBM - Meets MIL-STD-883 requirement for automotive assembly environments. |
| Operating Temperature | −40°C to +85°C - Qualified per AEC-Q100 Grade 3 for under-hood and cabin electronics. |
| Quiescent Current | 40 μA max - Supports low-power standby modes in always-on vehicle subsystems. |
Pinout & Package
TSSOP-20 (PW) package: 6.50 mm × 6.40 mm body size, 1.2 mm max height, 0.65 mm lead pitch, 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 independently. |
| 2, 4, 6, 8, 11, 13, 15, 17 | 1A1–1A4 / 2A1–2A4 | Eight buffered data inputs - TTL-compatible, no external pull-up required. |
| 3, 5, 7, 9, 12, 14, 16, 18 | 2Y4–2Y1 / 1Y4–1Y1 | Eight 3-state outputs - High-impedance when respective OE is high; rail-to-rail swing. |
| 10 | GND | Ground reference for all logic and output stages - must be low-impedance connection. |
| 20 | VCC | 5-V supply pin - requires local 0.1 μF bypass capacitor per TI layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Qualified | Grade 3 (−40°C to +85°C) - Validated for automotive infotainment, body control, and ADAS subsystems. |
| Dual Independent OE Control | Enables selective activation of two 4-bit channels - critical for time-multiplexed bus arbitration. |
| TTL-Compatible Inputs | VIH = 2.0 V, VIL = 0.8 V - Eliminates level-shifting when interfacing with legacy microcontrollers or FPGAs. |
| Low Dynamic Power | Cpd = 8.2 pF - Minimizes switching current in high-frequency clock distribution paths. |
| High-Noise Immunity | VIL(D) = 0.8 V, VOH(V) = 4.1 V - Maintains clean logic transitions in electrically noisy vehicle harness environments. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC I/O Expansion |
|---|---|
Use Scenario: Isolating microcontroller GPIOs from high-current solenoid drivers and relay coils in door lock, lighting, and window lift circuits. IC Role / Device Role: Signal buffer and isolation gate - prevents back-EMF and ESD transients from corrupting MCU logic. Use Value: Enables direct interface between 5-V MCU ports and noisy 12-V automotive loads without optocouplers or discrete protection. | Use Scenario: Expanding digital input capacity on modular PLC backplanes where field sensors connect via ribbon cables. IC Role / Device Role: Bus receiver and line driver - conditions slow/noisy sensor signals before routing to FPGA or ASIC logic. Use Value: Eliminates false triggering caused by cable-induced ringing and ground bounce in multi-drop industrial networks. |
| Automotive Instrument Cluster | Medical Diagnostic Equipment Interface |
Use Scenario: Gating SPI or parallel display data lines during controller reset sequences to prevent screen artifacts. IC Role / Device Role: Controlled signal hold - maintains stable display bus state while MCU reinitializes. Use Value: Prevents visual glitches and undefined pixel states during cold/warm boot cycles in safety-critical dashboards. | Use Scenario: Debouncing mechanical switches on patient monitor front panels and diagnostic probe connectors. IC Role / Device Role: Digital signal conditioner - filters contact bounce and EMI without software overhead. Use Value: Reduces firmware interrupt load and eliminates spurious trigger events in Class II medical devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHCT244QPWRG4Q1 | Same pinout and function; rated for −40°C to +125°C (Grade 1). | Required for engine bay or powertrain modules exceeding 85°C ambient. | Select CAHCT244IPWRG4Q1 for cabin/BCM use; SN74AHCT244QPWRG4Q1 for under-hood deployment. |
| SN74LVC244APWR | 3.3-V only supply (1.65–3.6 V); lower drive (±24 mA); no automotive qualification. | Suitable for consumer or industrial 3.3-V systems, not automotive safety-critical designs. | Only consider if migrating to 3.3-V logic and AEC-Q100 compliance is not required. |
Compared with SN74AHCT244QPWRG4Q1, CAHCT244IPWRG4Q1 trades extended temperature range for cost and availability in cabin-grade applications; versus SN74LVC244APWR, it provides guaranteed 5-V interoperability and automotive reliability at the expense of voltage flexibility.
Availability
CAHCT244IPWRG4Q1 is available at Aetrix Electronics and suitable for automotive body control, industrial PLC I/O expansion, and medical diagnostic equipment requiring stable component supply and full traceability.
Supply support for CAHCT244IPWRG4Q1 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 delivering analog, embedded processing, and connectivity solutions for automotive, industrial, and personal electronics markets.
The SN74AHCT244-Q1 product line delivers automotive-qualified, TTL-compatible logic buffers optimized for noise-immune signal routing in safety-critical vehicle subsystems.
FAQ
What is the maximum operating temperature for CAHCT244IPWRG4Q1?
The CAHCT244IPWRG4Q1 is qualified for operation from −40°C to +85°C per AEC-Q100 Grade 3 requirements. This makes it suitable for cabin, trunk, and non-engine-bay automotive applications where ambient temperatures remain within this range. The device's thermal resistance (RθJA = 116.8°C/W in TSSOP) supports reliable operation under continuous load at maximum ambient.
Does CAHCT244IPWRG4Q1 require external pull-up resistors on its OE pins?
Yes - to ensure high-impedance outputs during power-up or power-down, TI recommends tying both OE pins to VCC through a pull-up resistor. The minimum value depends on the current-sinking capability of the driving source; typical values range from 1 kΩ to 10 kΩ. Leaving OE floating risks undefined output states and potential bus contention.
Can CAHCT244IPWRG4Q1 interface directly with 3.3-V microcontrollers?
No - CAHCT244IPWRG4Q1 is a 5-V-only device with TTL-compatible inputs (VIH = 2.0 V min), but its outputs swing rail-to-rail (0 V to 5 V). Direct connection to 3.3-V logic inputs risks overvoltage damage unless the receiving device specifies 5-V tolerant inputs. For mixed-voltage systems, level translation or a 3.3-V buffer like SN74LVC244A is required.
What is the recommended bypass capacitor for CAHCT244IPWRG4Q1?
Texas Instruments recommends a 0.1 μF ceramic capacitor placed as close as possible to the VCC pin (Pin 20) and GND (Pin 10). This minimizes high-frequency supply noise and stabilizes switching transients. For systems with multiple logic ICs sharing a supply rail, additional bulk capacitance (e.g., 1 μF–10 μF) may be added nearby, but the 0.1 μF local cap is mandatory per TI layout guidelines.
Is CAHCT244IPWRG4Q1 pin-compatible with standard SN74AHCT244 devices?
Yes - CAHCT244IPWRG4Q1 shares identical pinout, electrical behavior, and functional operation with the commercial SN74AHCT244 in TSSOP-20 (PW) packaging. The "Q1" suffix denotes AEC-Q100 qualification and enhanced process controls, but no physical or logical changes affect PCB layout or firmware integration.
CAHCT244IPWRG4Q1 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
CAHCT244IPWRG4Q1 FAQ
1.How can I place an order for CAHCT244IPWRG4Q1 through Aetrix?
Please submit a Request for Quotation (RFQ) for CAHCT244IPWRG4Q1 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 CAHCT244IPWRG4Q1 reliable?
The price and inventory of CAHCT244IPWRG4Q1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CAHCT244IPWRG4Q1 is usually 5 days.
3.What payment methods are accepted for CAHCT244IPWRG4Q1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CAHCT244IPWRG4Q1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CAHCT244IPWRG4Q1?
CAHCT244IPWRG4Q1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CAHCT244IPWRG4Q1 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 CAHCT244IPWRG4Q1?
For technical support, including CAHCT244IPWRG4Q1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CAHCT244IPWRG4Q1 requirements.
6.How does Aetrix verify that CAHCT244IPWRG4Q1 is sourced from the original manufacturer or authorized distributors?
All CAHCT244IPWRG4Q1 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 CAHCT244IPWRG4Q1 meets industry standards.
7.What is the process for return or replacement of CAHCT244IPWRG4Q1?
All CAHCT244IPWRG4Q1 units undergo pre-shipment inspection (PSI). If there is an issue with CAHCT244IPWRG4Q1, 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 CAHCT244IPWRG4Q1 part is unused and in its original packaging.
Return procedure for CAHCT244IPWRG4Q1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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