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Texas Instruments SN74AHC244QPWRG4
- Part No.:
- SN74AHC244QPWRG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHC244QPWRG4.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,916
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Product details
Overview
SN74AHC244QPWRG4 from Texas Instruments is an automotive-grade octal 3-state buffer/driver IC designed for bus-oriented signal routing in memory-address, clock, and data-bus applications. It features dual 4-bit sections with independent output-enable (OE) controls, operates from 2 V to 5.5 V, supports –40°C to +125°C ambient, and delivers ±8 mA output drive at 5 V.
For engineers reviewing the SN74AHC244QPWRG4 datasheet, SN74AHC244QPWRG4 pinout, SN74AHC244QPWRG4 application, or SN74AHC244QPWRG4 equivalent, key selection criteria include its dual OE architecture, 3-state output isolation, AHC logic family speed-power trade-off, and TSSOP-20 packaging for high-density PCB layouts.
Technical Context
The SN74AHC244QPWRG4 implements two independent 4-bit non-inverting buffers, each controlled by a dedicated OE input (1OE on Pin 1, 2OE on Pin 19). Its EPIC™ CMOS process enables rail-to-rail input compatibility and low static current (ICC ≤ 40 μA), while maintaining fast propagation delays: tPLH/tPHL = 3.9 ns (5 V, CL = 15 pF) and tPZH/tPZL = 4.7 ns (5 V, CL = 15 pF).
It supports true 3-state operation with high-impedance outputs when OE is high, and meets JESD17 latch-up immunity (>250 mA). Input thresholds scale with VCC (VIH = 3.85 V min at 5.5 V; VIL = 1.65 V max), ensuring robust noise margin across supply voltages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - Enables interoperability with 2.5 V, 3.3 V, and 5 V logic domains without level shifters. |
| Output Drive | ±8 mA at 5 V - Sufficient to drive 15-pF loads with <6.5 ns propagation delay, supporting high-speed bus loading. |
| Operating Temp | –40°C to +125°C - Qualified for under-hood automotive electronics and industrial control environments. |
| Input Thresholds | VIH = 3.85 V, VIL = 1.65 V (at VCC = 5.5 V) - Provides >1.65 V noise margin against ground bounce or supply ripple. |
| Static Current | ICC ≤ 40 μA - Minimizes quiescent power in always-on subsystems such as CAN gateway wake-up logic. |
| ESD Rating | HBM ±1500 V - Meets automotive ESD robustness requirements per ISO 10605 for board-level handling. |
| Propagation Delay | tPLH/tPHL = 3.9 ns (5 V, CL = 15 pF) - Enables reliable timing in sub-100 MHz synchronous bus interfaces. |
Pinout & Package
TSSOP-20 package (PW), 6.5 mm × 4.4 mm body, 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 | 1OE / 2OE | Active-low output enable inputs - Independently disable each 4-bit section; tie to VCC via pull-up for power-up high-Z safety. |
| 2, 4, 6, 8, 11, 13, 15, 17 | A Inputs | Eight buffered data inputs - Split into two groups (1A1–1A4 and 2A1–2A4); no internal inversion. |
| 3, 5, 7, 9, 12, 14, 16, 18 | Y Outputs | Eight 3-state outputs - Paired with respective A inputs (e.g., 1A1 → 1Y1); high-Z when OE asserted. |
| 10 | GND | Ground reference - Must be low-impedance connection; decoupling capacitor required near Pin 20. |
| 20 | VCC | Power supply - Requires local 0.1 μF ceramic bypass capacitor; supports 2–5.5 V operation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent OE control | Enables selective gating of two 4-bit data paths without shared enable timing constraints or fanout limitations. |
| Automotive qualification | Meets AEC-Q100 Grade 1 requirements (–40°C to +125°C), including latch-up immunity >250 mA per JESD17. |
| EPIC™ CMOS process | Delivers low dynamic power (Cpd = 8.6 pF) and high noise immunity while maintaining TTL-compatible input thresholds. |
| Rail-to-rail input voltage range | Accepts VI from 0 V to VCC (up to 5.5 V), eliminating need for external clamping diodes in mixed-voltage systems. |
| High-speed 3-state switching | tPZH/tPZL = 4.7 ns (5 V, CL = 15 pF) ensures minimal bus contention window during direction changes in transceiver-like usage. |
Applications
| Memory Address Buffering | Microcontroller Bus Isolation |
|---|---|
Use Scenario: Driving address lines from an MCU to multiple SRAM or flash devices sharing a common data/address bus. IC Role / Device Role / Timing Role: Acts as a unidirectional address driver with 3-state outputs to prevent bus contention during memory access arbitration. Use Value: Enables clean address propagation with <6.5 ns delay and eliminates floating bus states during chip-select transitions. | Use Scenario: Isolating peripheral I/O expansion ports (e.g., GPIO expanders or ADCs) from the main MCU bus during reset or firmware update. IC Role / Device Role / Timing Role: Functions as a configurable bus gate - OE pins synchronized to MCU reset signal to force high-Z during boot sequence. Use Value: Prevents spurious writes or reads on peripherals during power-up, avoiding initialization faults in safety-critical systems. |
| Debounced Switch Interface | Industrial Sensor Signal Conditioning |
Use Scenario: Interfacing mechanical pushbuttons or limit switches to digital controllers where contact bounce causes false edge detection. IC Role / Device Role / Timing Role: Buffers switch signals while leveraging 3-state capability to disconnect noisy inputs during debounce filtering intervals. Use Value: Reduces false triggers by enabling software-controlled input sampling windows with hardware-enforced signal hold. | Use Scenario: Routing analog sensor interface signals (e.g., from thermistor ladder networks or RTD bridges) to ADC inputs in harsh industrial environments. IC Role / Device Role / Timing Role: Provides noise-immune digital buffering between isolated sensor front-end stages and microcontroller ADC trigger logic. Use Value: Maintains signal integrity through ±1500 V HBM ESD protection and >1.65 V noise margin, critical for factory-floor EMC compliance. |
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 |
|---|---|---|---|
| SN74LV244AQPWRG4 | Lower VCC range (1.65–5.5 V), reduced drive (±6 mA at 3.3 V), slower tPLH (5.5 ns @ 3.3 V) | Better suited for ultra-low-voltage battery-powered systems; less suitable for 5 V legacy bus interfaces. | Select when optimizing for sub-2 V operation or lower dynamic power, not for 5 V timing-critical buses. |
| SN74AHCT244QPWRG4 | TTL-compatible inputs (VIH = 2 V min), identical output drive and timing, same package | Required when interfacing with legacy 5 V TTL logic families; incompatible with pure CMOS-only systems due to input threshold mismatch. | Choose only when connecting directly to 5 V TTL outputs; otherwise SN74AHC244QPWRG4 offers superior noise margin. |
Compared with SN74LV244AQPWRG4 and SN74AHCT244QPWRG4, the SN74AHC244QPWRG4 provides optimal balance of wide supply range, high noise immunity, and 5 V bus compatibility - making it the preferred choice for new automotive and industrial designs requiring robust 3-state buffering without TTL legacy constraints.
Availability
SN74AHC244QPWRG4 is available at Aetrix Electronics and suitable for automotive infotainment head units, industrial PLC I/O modules, and aerospace data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74AHC244QPWRG4 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 90 years of innovation in high-reliability electronic components.
The SN74AHC244QPWRG4 belongs to TI's AHC logic family - engineered for automotive and industrial applications demanding wide voltage operation, high ESD tolerance, and guaranteed 3-state performance across extreme temperatures.
FAQ
What is the maximum operating temperature for the SN74AHC244QPWRG4?
The SN74AHC244QPWRG4 is rated for continuous operation from –40°C to +125°C ambient temperature. This Grade 1 automotive qualification is verified per AEC-Q100 and applies to the full specified VCC range (2 V to 5.5 V), making SN74AHC244QPWRG4 suitable for engine-control units and under-hood sensor interfaces where thermal stress is severe.
Does the SN74AHC244QPWRG4 support 2.5 V logic levels?
Yes, the SN74AHC244QPWRG4 fully supports 2.5 V operation: its VCC range includes 2.5 V, input thresholds scale accordingly (VIH ≈ 1.7 V, VIL ≈ 0.75 V), and output drive remains functional (±4 mA typical at 2.5 V). The SN74AHC244QPWRG4 maintains valid logic states and timing specifications across the entire 2 V–5.5 V range without external biasing.
How should unused inputs be handled on the SN74AHC244QPWRG4?
All unused inputs on the SN74AHC244QPWRG4 - including A inputs and OE pins - must be tied to a defined logic level (VCC or GND) to prevent floating states that cause excessive ICC, oscillation, or ESD susceptibility. For OE pins, tie to VCC via a pull-up resistor (e.g., 10 kΩ) to ensure high-impedance outputs at power-up; unused A inputs may be tied directly to VCC or GND depending on desired default output state.
Is the SN74AHC244QPWRG4 pin-compatible with standard SOIC-20 versions?
No, the SN74AHC244QPWRG4 uses a TSSOP-20 (PW) package with 0.65 mm lead pitch and 6.5 mm × 4.4 mm body size, whereas SOIC-20 (DW) variants like SN74AHC244QDWRG4 use 0.76 mm pitch and 12.8 mm × 7.5 mm dimensions. While electrical functionality and pin numbering are identical, PCB layout and reflow profiles differ significantly - direct substitution requires board redesign.
What is the recommended bypass capacitor for the SN74AHC244QPWRG4 VCC pin?
Texas Instruments recommends a 0.1 μF ceramic capacitor placed as close as possible to the VCC pin (Pin 20) and GND (Pin 10) to suppress high-frequency noise and stabilize supply during output switching transients. For systems with multiple VCC-connected logic devices, adding a bulk 1 μF tantalum or aluminum electrolytic capacitor nearby further improves low-frequency regulation - both are essential for reliable SN74AHC244QPWRG4 operation in noisy automotive or industrial environments.
SN74AHC244QPWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- 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:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74AHC244QPWRG4 FAQ
1.How can I place an order for SN74AHC244QPWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC244QPWRG4 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 SN74AHC244QPWRG4 reliable?
The price and inventory of SN74AHC244QPWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC244QPWRG4 is usually 5 days.
3.What payment methods are accepted for SN74AHC244QPWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHC244QPWRG4 transactions.
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4.How is shipping managed for SN74AHC244QPWRG4?
SN74AHC244QPWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC244QPWRG4 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 SN74AHC244QPWRG4?
For technical support, including SN74AHC244QPWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC244QPWRG4 requirements.
6.How does Aetrix verify that SN74AHC244QPWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74AHC244QPWRG4 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 SN74AHC244QPWRG4 meets industry standards.
7.What is the process for return or replacement of SN74AHC244QPWRG4?
All SN74AHC244QPWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC244QPWRG4, 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 SN74AHC244QPWRG4 part is unused and in its original packaging.
Return procedure for SN74AHC244QPWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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