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Texas Instruments SN74AHC244QPWR
- Part No.:
- SN74AHC244QPWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHC244QPWR.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,726
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Product details
Overview
SN74AHC244QPWR from Texas Instruments is an automotive-grade octal buffer/driver with 3-state outputs, designed for bus-oriented receivers and transmitters in memory-address and clock driver applications. It operates from 2 V to 5.5 V, supports –40 °C to 125 °C ambient temperature, delivers ±8 mA output drive at 5 V, and features EPIC™ CMOS process technology.
For engineers reviewing the SN74AHC244QPWR datasheet, SN74AHC244QPWR pinout, SN74AHC244QPWR application, or SN74AHC244QPWR equivalent, key selection considerations include its dual 4-bit 3-state architecture, TSSOP-20 package compatibility with high-density PCB layouts, automotive qualification (AEC-Q100), and precise timing parameters including tPLH/tPHL ≤ 5.5 ns at 5 V with 15 pF load.
Technical Context
The SN74AHC244QPWR implements two independent 4-bit non-inverting buffers, each controlled by a dedicated output-enable (OE) input. Its logic function enables data pass-through when OE is low and high-impedance tri-state operation when OE is high - critical for bidirectional bus isolation and signal gating.
It uses TI's EPIC™ (Enhanced-Performance Implanted CMOS) process to achieve latch-up immunity >250 mA per JESD17, ESD robustness (±1500 V HBM), and stable operation across full automotive temperature range (–40 °C to 125 °C) with supply voltage from 2 V to 5.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - supports mixed-voltage system interfacing (e.g., 3.3 V logic driving 5 V bus) |
| Output Drive | ±8 mA at 5 V - sufficient to drive standard TTL loads and moderate-capacitance buses without external buffering |
| Propagation Delay | 3.9 ns (tPLH/tPHL, 5 V, 15 pF) - enables reliable operation in high-speed digital control paths up to ~100 MHz |
| Operating Temperature | –40 °C to 125 °C - qualified for under-hood automotive electronics and industrial motor control environments |
| Input Thresholds | VIL = 1.65 V, VIH = 3.85 V at VCC = 5.5 V - provides 0.85 V noise margin for robust CMOS-level signal reception |
| Quiescent Current | 40 μA max at 5.5 V - enables low-power standby states in battery-backed or energy-sensitive systems |
| ESD Rating | ±1500 V HBM - meets automotive manufacturing ESD handling requirements per AEC-Q100 stress test guidelines |
Pinout & Package
TSSOP-20 (PW) package: 6.5 mm × 4.4 mm body, 0.65 mm lead pitch, 1.2 mm max height, RoHS-compliant NIPDAU finish, MSL Level-1 (260 °C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1 OE / 2 OE | Active-low enable inputs - independently control Y-group outputs; tie to VCC via pullup for power-up high-Z safety |
| 2–4, 8, 11–13, 17–18 | 1A1–1A4 / 2A1–2A4 | Non-inverting input pins - accept CMOS/TTL logic levels; all unused inputs must be tied to VCC or GND |
| 3, 5–7, 9, 12, 14–16, 18 | 2Y4–2Y1 / 1Y4–1Y1 | 3-state buffered outputs - present high-impedance state when corresponding OE is high; support bus contention avoidance |
| 10 | GND | Ground reference - requires low-inductance connection to system ground plane for noise immunity |
| 20 | VCC | Power supply - requires local 0.1 μF ceramic bypass capacitor placed within 3 mm of pin for stable switching performance |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | Meets AEC-Q100 Grade 1 requirements - validated for use in engine control units, body electronics, and ADAS subsystems |
| Dual independent 4-bit control | Two separate OE inputs allow selective enabling of two 4-bit data groups - simplifies bus arbitration without external logic |
| High noise immunity | VIH/VIL thresholds scale with VCC and provide ≥0.85 V noise margin at 5.5 V - resists coupling from adjacent high-speed traces |
| Low dynamic power | 8.6 pF typical power dissipation capacitance - minimizes switching current and heat generation in high-frequency toggle scenarios |
| Robust latch-up immunity | Exceeds 250 mA per JESD17 - prevents destructive latch-up during transient overvoltage events in automotive 12 V systems |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Expansion Module |
|---|---|
|
Use Scenario: Isolating microcontroller GPIOs from noisy CAN transceiver control lines and sensor multiplexers during reset sequences. IC Role / Device Role: 3-state buffer enabling/disabling signal paths between MCU and peripheral ICs without bus contention. Use Value: Prevents spurious writes during power-up by holding outputs in high-Z until firmware initializes OE control - eliminates ECU boot-time glitches. |
Use Scenario: Driving multiple 24 V discrete input cards from a 3.3 V FPGA-based controller in modular automation racks. IC Role / Device Role: Level-shifting and fan-out buffer that translates low-voltage logic to higher-current bus signals. Use Value: Delivers ±8 mA per output at 5 V - sufficient to drive optocoupler inputs directly, reducing component count vs. discrete transistor solutions. |
| Medical Imaging Data Acquisition Board | Avionics Display Interface Subsystem |
|
Use Scenario: Gating ADC sample clock distribution to multiple analog front-end channels during calibration cycles. IC Role / Device Role: Clock driver with enable-controlled output disable - synchronously halts clock delivery to sub-circuits. Use Value: Propagation delay ≤5.5 ns ensures <1% jitter contribution to 100 MHz sampling clocks - preserves signal integrity in 16-bit+ acquisition paths. |
Use Scenario: Buffering ARINC 429 transmit/receive control signals between flight management computer and display processors. IC Role / Device Role: Signal conditioner isolating sensitive avionics logic from EMI-prone wiring harnesses. Use Value: ±1500 V HBM ESD rating and –40 °C to 125 °C operation ensure reliability in pressurized cabin environments with wide thermal cycling. |
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 |
|---|---|---|---|
| SN74LV244APWR | Lower VCC range (1.65 V–5.5 V); reduced drive (±6 mA at 3.3 V); slower propagation (7.5 ns typical at 3.3 V) | Better suited for ultra-low-voltage portable systems; not qualified for automotive temperature range | Select when operating below 2 V or prioritizing static power over speed; verify timing margins in 100+ MHz paths |
| MC74VHC244DTG | Same pinout and function but manufactured by ON Semiconductor; slightly higher ICC (50 μA max); identical automotive temp rating | Drop-in replacement in legacy designs using ON Semi parts; same JEDEC MO-153 footprint | Use for second-source assurance in long-lifecycle aerospace programs where multi-supplier strategy is mandated |
Compared with SN74LV244APWR and MC74VHC244DTG, the SN74AHC244QPWR offers superior speed-to-power ratio at 5 V, guaranteed automotive temperature compliance, and tighter propagation delay distribution - making it optimal for time-critical engine control and real-time industrial communication interfaces.
Availability
SN74AHC244QPWR is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC I/O modules, medical imaging data acquisition boards, and avionics display interface subsystems requiring stable component supply across extended product lifecycles.
Supply support for SN74AHC244QPWR 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 specializing in analog and embedded processing technologies, with leadership in automotive, industrial, and communications markets.
The SN74AHC244QPWR belongs to TI's AHC logic family - engineered for high-speed, low-power, automotive-qualified digital interfacing in noise-sensitive and thermally demanding environments.
FAQ
What is the maximum operating frequency supported by SN74AHC244QPWR?
The SN74AHC244QPWR does not specify a maximum clock frequency in its datasheet because it is a combinational buffer, not a clocked device. However, its propagation delay (tPLH/tPHL ≤ 5.5 ns at 5 V, 15 pF) supports reliable operation in digital signal paths up to approximately 100 MHz, assuming proper layout, termination, and load capacitance management. The actual usable frequency depends on system-level timing margins and board parasitics.
Does SN74AHC244QPWR require external pull-up resistors on its OE pins?
Yes - to ensure high-impedance outputs during power-up and power-down, SN74AHC244QPWR OE pins should be tied to VCC through a pull-up resistor. TI recommends a value determined by the current-sinking capability of the driving source; typical values range from 4.7 kΩ to 10 kΩ. Leaving OE floating risks undefined output states and potential bus contention.
Is SN74AHC244QPWR pin-compatible with SN74AHC244PWR?
No - SN74AHC244QPWR is the automotive-qualified version (AEC-Q100 Grade 1, –40 °C to 125 °C), while SN74AHC244PWR is the commercial version (–40 °C to 85 °C). Both share identical TSSOP-20 pinout, electrical specifications, and functional behavior, but SN74AHC244QPWR undergoes additional automotive qualification testing and has distinct part marking (HA244Q) and packaging labeling.
Can SN74AHC244QPWR drive a 50 pF bus load at 3.3 V while maintaining timing specs?
Yes - SN74AHC244QPWR specifies switching characteristics for CL = 50 pF at both 3.3 V and 5 V. At 3.3 V, tPLH/tPHL is 8.3–11.9 ns (min–max), and tPZH/tPZL is 9.1–14.1 ns. These values remain within datasheet limits, confirming reliable operation with 50 pF loads common in backplane or multi-drop PCB routing scenarios.
What is the purpose of the EPIC™ process used in SN74AHC244QPWR?
The EPIC™ (Enhanced-Performance Implanted CMOS) process in SN74AHC244QPWR delivers improved speed, lower power consumption, and enhanced latch-up immunity (>250 mA per JESD17) compared to standard CMOS. This process enables stable operation across the full automotive temperature range and supports robust performance in electrically noisy environments such as engine compartments and industrial motor drives.
SN74AHC244QPWR 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:
- 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:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74AHC244QPWR FAQ
1.How can I place an order for SN74AHC244QPWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC244QPWR 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 SN74AHC244QPWR reliable?
The price and inventory of SN74AHC244QPWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC244QPWR is usually 5 days.
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4.How is shipping managed for SN74AHC244QPWR?
SN74AHC244QPWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC244QPWR 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 SN74AHC244QPWR?
For technical support, including SN74AHC244QPWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC244QPWR requirements.
6.How does Aetrix verify that SN74AHC244QPWR is sourced from the original manufacturer or authorized distributors?
All SN74AHC244QPWR 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 SN74AHC244QPWR meets industry standards.
7.What is the process for return or replacement of SN74AHC244QPWR?
All SN74AHC244QPWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC244QPWR, 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 SN74AHC244QPWR part is unused and in its original packaging.
Return procedure for SN74AHC244QPWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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