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Texas Instruments SN74HCT244QPWRQ1
- Part No.:
- SN74HCT244QPWRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74HCT244QPWRQ1.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,888
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Product details
Overview
SN74HCT244QPWRQ1 from Texas Instruments is an automotive-qualified octal noninverting buffer/line driver with independent 3-state outputs, operating from 4.5 V to 5.5 V, delivering ±6 mA output drive at 5 V, with typical propagation delay of 13 ns (at 5.5 V, CL = 50 pF), and supporting memory address bus driving in vehicle control modules.
For engineers reviewing the SN74HCT244QPWRQ1 datasheet, SN74HCT244QPWRQ1 pinout, SN74HCT244QPWRQ1 application, or SN74HCT244QPWRQ1 equivalent, key selection criteria include automotive AEC-Q100 qualification, TTL-compatible inputs, high-current 3-state bus driving capability, and thermal performance under −40°C to +125°C ambient conditions.
Technical Context
The SN74HCT244QPWRQ1 implements two independent 4-bit buffer sections, each with dedicated output-enable (OE) control. Its logic function is strictly noninverting: when OE is low, A inputs pass directly to Y outputs; when OE is high, all Y outputs enter high-impedance state.
This device uses HCMOS-compatible input thresholds (VIH = 2 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V) and delivers rail-to-rail CMOS-level outputs. It supports bus-oriented bidirectional data flow control via separate OE pins, enabling time-multiplexed address/data sharing on shared PCB traces without contention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V automotive power rails and robust noise margin. |
| Propagation Delay (tpd) | 13 ns typ @ 5.5 V, CL = 50 pF - enables reliable timing in 30-MHz+ address/data strobe applications. |
| Output Drive | ±6 mA @ 5 V - drives up to 15 LSTTL loads, sufficient for fanout across multiple downstream logic devices. |
| Input Current | ≤1 μA max - minimizes loading on upstream signal sources and preserves signal integrity in high-density routing. |
| Operating Temperature | −40°C to +125°C - meets AEC-Q100 Grade 1 requirements for engine bay and ADAS ECU deployment. |
| ESD Protection | >200 V (machine model), >1000 V (MIL-STD-883) - withstands handling and board-level transients in automotive assembly environments. |
| Quiescent Current (ICC) | 80 μA max - enables low-static-power operation in always-on vehicle subsystems. |
Pinout & Package
TSSOP-20 package (PW), 6.50 mm × 4.40 mm body size, 1.2 mm max height, lead finish NIPDAU, MSL Level-3 (260°C, 168 hr).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Output-enable control (active-low) | Independent enable for each 4-bit section; asserts low to activate Y outputs, high to tri-state. |
| 1A1–1A4, 2A1–2A4 | Data inputs | Noninverting input terminals for respective buffer sections; TTL-voltage compatible (0.8 V/2 V thresholds). |
| 1Y1–1Y4, 2Y1–2Y4 | Buffered outputs | CMOS-level outputs with ±6 mA drive; high-impedance when corresponding OE is high. |
| VCC (Pin 19) | Power supply | 5-V nominal supply connection; requires local 0.1-μF bypass capacitor per TI layout guidelines. |
| GND (Pin 10) | Ground reference | Common return path for all signals and power; must be low-impedance to minimize ground bounce. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Rated for automotive Grade 1 (−40°C to +125°C), including stress testing per automotive reliability standards. |
| Independent dual 4-bit OE control | Enables selective activation of address vs. data bus segments without external gating logic or timing overlap risk. |
| TTL-compatible inputs | Accepts standard TTL voltage levels (VIH ≥ 2 V, VIL ≤ 0.8 V), eliminating need for level-shifting in mixed-logic systems. |
| Low ICC and IOZ | 80 μA max quiescent current and ≤10 μA max off-state leakage ensure minimal standby power in battery-sensitive modules. |
| High-noise-immunity outputs | CMOS rail-to-rail swing with 6 mA drive provides >400 mV noise margin at 5 V, critical for noisy vehicle harness environments. |
Applications
| Engine Control Unit (ECU) Address Buffering | ADAS Camera Interface Data Multiplexing |
|---|---|
Use Scenario: Isolating microcontroller address lines from flash memory and peripheral register banks in a Tier-1 ECU. IC Role / Device Role / Timing Role: Noninverting 3-state buffer providing controlled, contention-free address bus access during memory read/write cycles. Use Value: Enables deterministic timing with 13 ns tpd and eliminates bus contention via independent OE control per memory region. |
Use Scenario: Time-division multiplexing of parallel image data lanes between camera sensor and SoC in surround-view systems. IC Role / Device Role / Timing Role: Bidirectional bus driver managing shared data paths between MIPI CSI-2 bridge and image processing unit. Use Value: Supports 30+ MHz pixel clock rates with guaranteed setup/hold margins due to matched propagation delays across all 8 channels. |
| Body Control Module (BCM) I/O Expansion | Infotainment Head Unit Memory Interface |
Use Scenario: Extending GPIO count from MCU to drive LED arrays, relay drivers, and sensor interface lines in door modules. IC Role / Device Role / Timing Role: High-current line driver translating low-drive MCU outputs into robust 6 mA buffered signals for external loads. Use Value: Eliminates discrete transistor buffers while maintaining <1 μA input loading on MCU pins and full AEC-Q100 compliance. |
Use Scenario: Driving SRAM or NOR flash address lines in head unit mainboard where space and thermal budget are constrained. IC Role / Device Role / Timing Role: Low-power address latch buffer reducing dynamic current draw during frequent memory access bursts. Use Value: Achieves 80 μA max ICC and 40 pF typical Cpd, cutting switching power by >30% versus standard HCT alternatives in burst-mode operation. |
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 |
|---|---|---|---|
| SN74HCT244PWRG4Q1 | Same electrical specs and pinout; differs only in lead finish (NIPDAU vs. matte tin) and MSL rating (Level-1 vs. Level-3). | Preferred for reflow processes requiring unlimited floor life; less suitable for long-term storage before assembly. | Select when production line uses Level-1 reflow profile and no extended dry-pack requirement exists. |
| SN74LVTH244APWRG4Q1 | Lower VCC range (2.7–3.6 V); higher speed (tpd = 3.5 ns typ); LVCMOS input thresholds (VIH = 2.0 V min at 3.3 V). | Designed for 3.3-V systems; incompatible with 5-V buses without level translation; not drop-in for legacy 5-V designs. | Choose only when migrating to 3.3-V architecture and redesigning power delivery and signal thresholds. |
Compared with SN74HCT244QPWRQ1, SN74HCT244PWRG4Q1 offers identical functionality with relaxed moisture sensitivity but reduced storage lifetime, while SN74LVTH244APWRG4Q1 delivers faster timing at lower voltage but requires full system-level voltage domain redesign.
Availability
SN74HCT244QPWRQ1 is available at Aetrix Electronics and suitable for automotive ECU design, ADAS sensor interface development, and infotainment memory subsystems requiring stable component supply across multi-year production programs.
Supply support for SN74HCT244QPWRQ1 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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and automotive-grade silicon solutions.
The SN74HCT244QPWRQ1 belongs to TI's automotive logic portfolio, engineered specifically for robust 3-state bus interfacing in engine control, body electronics, and driver-assistance systems under harsh thermal and ESD conditions.
FAQ
What automotive qualification does SN74HCT244QPWRQ1 meet?
The SN74HCT244QPWRQ1 is qualified to AEC-Q100 Grade 1 standards, covering operation from −40°C to +125°C ambient temperature, with full reliability testing including HTOL, TC, and ESD per MIL-STD-883. This makes SN74HCT244QPWRQ1 suitable for under-hood and safety-critical vehicle subsystems where thermal and electrical robustness are mandatory.
Does SN74HCT244QPWRQ1 support 3.3-V input logic levels?
No, SN74HCT244QPWRQ1 has TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max) optimized for 5-V systems. While it may function with 3.3-V inputs in some cases, TI does not guarantee operation outside the specified 4.5–5.5 V supply range or with sub-threshold input voltages. For 3.3-V interfaces, SN74LVTH244APWRG4Q1 is the designated alternative.
How many independent output-enable controls does SN74HCT244QPWRQ1 have?
SN74HCT244QPWRQ1 has two independent active-low output-enable inputs: 1OE controls Y1–Y4, and 2OE controls Y5–Y8. This allows selective activation of either 4-bit group without affecting the other, enabling flexible bus segmentation in memory-mapped peripherals or multi-master arbitration schemes.
What is the maximum capacitive load SN74HCT244QPWRQ1 can drive reliably?
SN74HCT244QPWRQ1 is characterized for CL = 50 pF and CL = 150 pF loads in its switching specifications. At 150 pF and 5.5 V, typical propagation delay is 40 ns, and output rise/fall times remain within 16 ns. Driving beyond 150 pF risks timing violations and increased power dissipation; for heavier loads, consider buffering or using lower-capacitance PCB routing.
Is SN74HCT244QPWRQ1 pin-compatible with standard SN74HCT244 variants?
Yes, SN74HCT244QPWRQ1 shares identical pinout, function table, and electrical behavior with commercial SN74HCT244 devices in TSSOP-20 (PW) package. The "Q1" suffix denotes automotive qualification and enhanced reliability screening, but no changes are made to pin assignment, logic behavior, or DC/AC parameters - making SN74HCT244QPWRQ1 a direct replacement in existing 5-V designs requiring AEC-Q100 compliance.
SN74HCT244QPWRQ1 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74HCT244QPWRQ1 FAQ
1.How can I place an order for SN74HCT244QPWRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCT244QPWRQ1 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 SN74HCT244QPWRQ1 reliable?
The price and inventory of SN74HCT244QPWRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCT244QPWRQ1 is usually 5 days.
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SN74HCT244QPWRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCT244QPWRQ1 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 SN74HCT244QPWRQ1?
For technical support, including SN74HCT244QPWRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCT244QPWRQ1 requirements.
6.How does Aetrix verify that SN74HCT244QPWRQ1 is sourced from the original manufacturer or authorized distributors?
All SN74HCT244QPWRQ1 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 SN74HCT244QPWRQ1 meets industry standards.
7.What is the process for return or replacement of SN74HCT244QPWRQ1?
All SN74HCT244QPWRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCT244QPWRQ1, 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 SN74HCT244QPWRQ1 part is unused and in its original packaging.
Return procedure for SN74HCT244QPWRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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