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Texas Instruments SN74HCT244QPWRG4Q1
- Part No.:
- SN74HCT244QPWRG4Q1
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74HCT244QPWRG4Q1.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,773
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Product details
Overview
SN74HCT244QPWRG4Q1 from Texas Instruments is an automotive-qualified octal buffer and line driver with 3-state outputs, operating at 4.5 V to 5.5 V, delivering ±6 mA output drive at 5 V, featuring typical propagation delay of 13 ns (at 5.5 V, CL = 50 pF), and supporting high-density bus interfacing in vehicle control modules.
For engineers reviewing the SN74HCT244QPWRG4Q1 datasheet, SN74HCT244QPWRG4Q1 pinout, SN74HCT244QPWRG4Q1 application, or SN74HCT244QPWRG4Q1 equivalent, key selection criteria include automotive AEC-Q100 qualification, TTL-compatible inputs, dual independent 4-bit 3-state enable control, low ICC (≤160 μA), and TSSOP-20 package compatibility with space-constrained ECUs.
Technical Context
The SN74HCT244QPWRG4Q1 implements two independent 4-bit noninverting buffers, each with dedicated output-enable (OE) inputs-1OE controls Y1–Y4, 2OE controls Y5–Y8-enabling selective bus isolation. Its logic thresholds are TTL-voltage compatible (VIH = 2 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V).
It operates across −40°C to +125°C with junction-to-ambient thermal resistance of 131.8°C/W in TSSOP-20, supports 15 LSTTL loads per output, and maintains high-impedance state when OE is high-critical for bidirectional data bus contention avoidance in automotive CAN gateway and sensor interface subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures stable operation across automotive battery rail fluctuations (e.g., cold-crank down to 4.5 V). |
| Output Drive | ±6 mA at 5 V - sufficient to directly drive 15 LSTTL loads without external buffering in ECU address/data buses. |
| Propagation Delay | 13 ns typical (5.5 V, CL = 50 pF) - enables reliable timing in 20–25 MHz bus cycles for legacy microcontroller peripherals. |
| Quiescent Current | ≤160 μA max - minimizes standby power in always-on vehicle modules like body control units. |
| Input Compatibility | TTL-voltage compatible (VIH ≥ 2 V, VIL ≤ 0.8 V) - interoperable with legacy 5-V microcontrollers and FPGAs without level shifters. |
| Operating Temperature | −40°C to +125°C - certified for under-hood and transmission-control applications per AEC-Q100 Grade 1. |
| ESD Protection | ≥200 V (machine model), ≥1000 V (MIL-STD-883 Method 3015) - robust against assembly and field handling discharge events. |
Pinout & Package
TSSOP-20 package (6.50 mm × 4.40 mm, 1.2 mm max height), lead finish NIPDAU, moisture sensitivity level 1 (260°C, unlimited reflow), RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output-enable inputs | Independent control of two 4-bit groups; pulling low enables corresponding Y outputs; high places them in high-Z. |
| 1A1–1A4, 2A1–2A4 | Noninverting input terminals | Eight buffered inputs mapped 1:1 to Y outputs; TTL-compatible voltage thresholds ensure direct MCU/FPGA connection. |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state noninverting output terminals | Drive bus lines or memory address registers; high-Z state prevents contention during multiplexed access. |
| VCC (Pin 10), GND (Pin 11) | Power supply terminals | Single 5-V supply; requires local 0.1-μF bypass capacitor placed adjacent to VCC pin for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Rated for automotive Grade 1 (−40°C to +125°C), enabling use in engine control, ADAS sensors, and infotainment gateways. |
| Dual independent OE control | Enables selective activation of two 4-bit channels-ideal for time-multiplexed bus arbitration or split peripheral addressing. |
| High-current 3-state outputs | ±6 mA drive capability allows direct termination of stub-loaded CAN/LIN transceiver buses or legacy parallel memory interfaces. |
| Low ICC and Ci | ≤160 μA quiescent current and ≤10 pF input capacitance minimize loading on upstream drivers and reduce dynamic power in clock distribution. |
| TTL-compatible inputs | Accepts standard 5-V TTL logic levels without external biasing-simplifies integration with legacy microcontrollers and discrete logic. |
Applications
| Engine Control Unit Bus Interface | CAN Gateway Address Buffering |
|---|---|
|
Use Scenario: Isolating and driving multiplexed address/data lines between MCU and external flash or EEPROM in engine ECU. IC Role / Device Role / Timing Role: Octal noninverting buffer with independent 3-state control acts as address latch driver and bus isolator during memory read/write cycles. Use Value: Enables deterministic timing (tpd ≤ 28 ns) and prevents bus contention during simultaneous peripheral access-critical for ASAM-compliant calibration workflows. |
Use Scenario: Level-shifting and buffering MCU GPIO signals to multiple CAN transceivers in a multi-bus gateway module. IC Role / Device Role / Timing Role: Dual 4-bit buffer provides isolated signal paths for TX/RX enable lines and transceiver configuration pins. Use Value: Eliminates need for discrete MOSFET switches; ±6 mA drive ensures fast edge rates on transceiver control lines, reducing CAN arbitration latency. |
| Body Control Module I/O Expansion | Instrument Cluster Display Driver |
|
Use Scenario: Expanding GPIO count of low-pin-count MCU to drive relays, LEDs, and diagnostic indicators in BCM. IC Role / Device Role / Timing Role: 3-state buffer serves as output expander with software-controllable channel isolation via OE pins. Use Value: Allows hot-swap-safe I/O partitioning-disabling one 4-bit group during firmware update avoids unintended relay actuation or LED flicker. |
Use Scenario: Driving segment lines of a 7-segment or dot-matrix LCD in automotive instrument clusters. IC Role / Device Role / Timing Role: Noninverting buffer translates MCU port pins to higher-current display segment drivers while maintaining precise timing alignment. Use Value: 13 ns typical tpd ensures synchronized segment updates across all digits-eliminating ghosting or partial illumination artifacts at 60 Hz refresh. |
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 |
|---|---|---|---|
| SN74HCT244QPWRQ1 | Same silicon, identical electrical specs, but MSL Level-3 (168 hr floor life) vs. Level-1 (unlimited) for SN74HCT244QPWRG4Q1. | Suitable for lower-volume, non-automated assembly where moisture-sensitive handling protocols apply. | Select SN74HCT244QPWRG4Q1 for high-throughput SMT lines requiring no dry-pack or baking; choose Q1 variant only if MSL-3 compliance is mandated by internal process controls. |
| SN74LV244AQPWRQ1 | Lower-voltage family (1.65–5.5 V), reduced drive (±12 mA at 3.3 V), higher input leakage (±10 μA), and slower tpd (21 ns typ at 3.3 V). | Better suited for mixed-voltage systems with 3.3-V MCUs; not drop-in compatible due to VIH/VIL shift and timing mismatch at 5 V. | Use SN74LV244AQPWRQ1 only when migrating to 3.3-V domains; SN74HCT244QPWRG4Q1 remains optimal for pure 5-V automotive legacy designs. |
Compared with SN74HCT244QPWRQ1, SN74HCT244QPWRG4Q1 offers unlimited floor life and simplified handling-reducing production line downtime. Against SN74LV244AQPWRQ1, it delivers tighter timing, lower leakage, and guaranteed 5-V TTL compatibility-making it the preferred choice for existing 5-V ECU architectures.
Availability
SN74HCT244QPWRG4Q1 is available at Aetrix Electronics and suitable for automotive engine control units, CAN gateway modules, and body control systems requiring stable component supply across extended product lifecycles.
Supply support for SN74HCT244QPWRG4Q1 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 ICs, with over 90 years of innovation in high-reliability electronics.
The SN74HCT244-Q1 product line delivers AEC-Q100-qualified logic devices optimized for automotive signal integrity, bus isolation, and ECU-level peripheral interfacing-designed to replace discrete transistor arrays and legacy 74-series components in safety-critical systems.
FAQ
What automotive qualification does SN74HCT244QPWRG4Q1 meet?
SN74HCT244QPWRG4Q1 is AEC-Q100 qualified for Grade 1 (−40°C to +125°C ambient), with full test documentation including HTOL, TC, and ESD per MIL-STD-883 Method 3015. It is approved for use in engine control, transmission, and chassis modules-not just infotainment or comfort systems. The device undergoes wafer-level and final-test screening per TI's automotive quality flow, and its qualification status is verified in the official TI AEC-Q100 certificate for SCLS509C revision C.
Is SN74HCT244QPWRG4Q1 pin-compatible with standard SN74HCT244 variants?
Yes, SN74HCT244QPWRG4Q1 shares identical pinout, function table, and AC/DC specifications with non-automotive SN74HCT244 variants in TSSOP-20 (PW) package-including SN74HCT244PWR and SN74HCT244N. All share the same 1OE/1A1–1A4/1Y1–1Y4/2OE/2A1–2A4/2Y1–2Y4 layout and electrical behavior-but SN74HCT244QPWRG4Q1 adds automotive qualification, enhanced ESD, and extended temperature validation beyond commercial-grade parts.
What is the maximum capacitive load SN74HCT244QPWRG4Q1 can drive reliably?
SN74HCT244QPWRG4Q1 is characterized up to 150 pF load capacitance per output, with switching parameters specified at both CL = 50 pF (tpd = 13 ns typ at 5.5 V) and CL = 150 pF (tpd = 18 ns typ at 5.5 V). Driving >150 pF risks exceeding recommended transition times (Δt/Δv ≤ 500 ns) and may cause signal integrity issues-so for >150 pF loads, external series termination or buffer staging is advised. The device's 6-mA drive strength supports this range without external amplification.
How should unused inputs be handled on SN74HCT244QPWRG4Q1?
All unused inputs on SN74HCT244QPWRG4Q1 must be tied to either VCC or GND-never left floating-to prevent undefined logic states, increased ICC, or oscillation. TI explicitly mandates this in Section 5.2 of SCLS509C. For example, if only four inputs (1A1–1A4) are used, tie 2A1–2A4 to GND (or VCC depending on required default output state), and tie 2OE to VCC to disable the second group. Floating inputs violate AEC-Q100 reliability requirements and may induce latch-up in automotive environments.
Does SN74HCT244QPWRG4Q1 support hot insertion or live bus swapping?
No, SN74HCT244QPWRG4Q1 does not support hot insertion. Its absolute maximum ratings do not include powered-insertion stress conditions, and the device lacks bus-hold or Ioff protection. During live bus swapping, unpowered VCC or GND pins risk violating the "VI < 0 or VI > VCC" clamp current limit (±20 mA), potentially damaging internal ESD structures. TI recommends powering the device before applying input signals and using external hot-swap controllers or sequencing circuits when live insertion is required in modular automotive systems.
SN74HCT244QPWRG4Q1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- 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:
- 6mA, 6mA
- 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
SN74HCT244QPWRG4Q1 FAQ
1.How can I place an order for SN74HCT244QPWRG4Q1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCT244QPWRG4Q1 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 SN74HCT244QPWRG4Q1 reliable?
The price and inventory of SN74HCT244QPWRG4Q1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCT244QPWRG4Q1 is usually 5 days.
3.What payment methods are accepted for SN74HCT244QPWRG4Q1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HCT244QPWRG4Q1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HCT244QPWRG4Q1?
SN74HCT244QPWRG4Q1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCT244QPWRG4Q1 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 SN74HCT244QPWRG4Q1?
For technical support, including SN74HCT244QPWRG4Q1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCT244QPWRG4Q1 requirements.
6.How does Aetrix verify that SN74HCT244QPWRG4Q1 is sourced from the original manufacturer or authorized distributors?
All SN74HCT244QPWRG4Q1 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 SN74HCT244QPWRG4Q1 meets industry standards.
7.What is the process for return or replacement of SN74HCT244QPWRG4Q1?
All SN74HCT244QPWRG4Q1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCT244QPWRG4Q1, 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 SN74HCT244QPWRG4Q1 part is unused and in its original packaging.
Return procedure for SN74HCT244QPWRG4Q1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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