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Texas Instruments SN74AC244QPWRQ1
- Part No.:
- SN74AC244QPWRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AC244QPWRQ1.pdf
- Description:
- AUTOMOTIVE EIGHT-CHANNEL 2-V TO
- Quantity:
- Payment:
- Shipping:
Inventory:1,956
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Product details
Overview
SN74AC244QPWRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive octal buffer/driver with Schmitt-trigger inputs and dual 4-channel 3-state outputs, operating from 1.5V to 6V supply, delivering ≤6.8ns propagation delay at 5V, ±24mA continuous output drive, and supporting 50Ω transmission line driving - used for signal conditioning and bus isolation in engine control units and ADAS domain controllers.
For engineers reviewing the SN74AC244QPWRQ1 datasheet, SN74AC244QPWRQ1 pinout, SN74AC244QPWRQ1 application, or SN74AC244QPWRQ1 equivalent, key selection criteria include its dual-bank 3-state control architecture, -40°C to +125°C operation, wettable-flank VQFN-20 (RKS) package compatibility, and Schmitt-trigger noise immunity on all inputs.
Technical Context
The SN74AC244QPWRQ1 implements two independent banks of four non-inverting CMOS buffers, each bank controlled by a dedicated active-low output enable (1OE/2OE). Each input features Schmitt-trigger hysteresis (typ. 0.3–0.5V depending on VCC), enabling robust rejection of slow-rising or noisy signals.
Its 3-state outputs support high-impedance disconnection during power sequencing or bus sharing, with balanced sourcing/sinking capability (±24mA continuous, ±75mA pulsed at 5V) and guaranteed drive into 50Ω loads. Propagation delay scales predictably with supply voltage: 6.8ns max at 5V, 9.5ns at 3.3V, and 20.8ns at 2.5V (CL = 50pF).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5V to 6V - supports mixed-voltage system interfacing (e.g., 1.8V MCU to 5V peripheral bus) |
| Propagation Delay (tpd) | ≤6.8ns at 5V (CL = 50pF) - enables timing-critical data path buffering in automotive serial buses |
| Output Drive Strength | ±24mA continuous at 5V - sufficient to drive multiple CMOS loads or terminate 50Ω lines without external drivers |
| Input Hysteresis | Schmitt-trigger inputs with ~0.4V typical hysteresis at 5V - eliminates chatter from noisy sensor or switch inputs |
| Operating Temperature | -40°C to +125°C (Grade 1) - qualified for under-hood ECU and radar module environments |
| ESD Rating | HBM ±2000V, CDM ±1000V - meets AEC-Q100-002/-011 for automotive reliability |
| Quiescent Current | ≤20µA at 5.5V - negligible standby power impact in always-on vehicle networks |
Pinout & Package
SN74AC244QPWRQ1 is packaged in a 20-pin VQFN (RKS) with wettable flanks, 4.5mm × 2.5mm body size, and exposed thermal pad (to be connected to GND or left floating per datasheet).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low bank enable inputs | Independent control of Bank 1 (pins 2,4,6,8 → 18,16,14,12) and Bank 2 (pins 11,13,15,17 → 3,5,7,9); tie to VCC via pull-up for power-up high-Z |
| 1A1–1A4, 2A1–2A4 | Buffer input terminals | Eight CMOS inputs with Schmitt-trigger hysteresis; all require termination to VCC/GND when unused |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state buffer outputs | Eight CMOS outputs capable of sourcing/sinking ±24mA; enter high-Z when respective OE is high |
| VCC (Pin 20), GND (Pin 10) | Power supply terminals | Single-supply operation; thermal pad enhances thermal dissipation (RθJB = 40.4°C/W) |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive use across -40°C to +125°C ambient, including HBM/CDM ESD stress testing |
| Dual independent 4-channel banks | Enables selective bus gating - e.g., isolate CAN transceiver logic from microcontroller during reset while keeping LIN interface active |
| Schmitt-trigger inputs | Eliminates need for external RC filtering on debounced switch or analog sensor interfaces |
| Wettable flank QFN (RKS) | Enables automated optical inspection (AOI) of solder joints - critical for zero-defect automotive manufacturing |
| 50Ω transmission line drive | Direct interface to high-speed traces without series termination resistors in short-reach ADAS camera links |
Applications
| Engine Control Unit Signal Isolation | ADAS Camera Interface Buffering |
|---|---|
Use Scenario: Isolating microcontroller GPIOs from high-noise injector driver circuits during cold cranking. IC Role / Device Role / Timing Role: Octal buffer with Schmitt-trigger inputs cleans slow/floating signals and provides 3-state isolation during MCU reset. Use Value: Prevents spurious injector firing by rejecting sub-100ns noise spikes and ensuring deterministic high-Z state during boot. |
Use Scenario: Driving parallel pixel data lines from image sensor to SoC over 10cm PCB traces. IC Role / Device Role / Timing Role: Transmission-line-capable buffer maintains signal integrity at 25MHz pixel clock with <6.8ns skew. Use Value: Eliminates need for discrete series resistors and reduces BOM count while meeting MIPI D-PHY timing margins. |
| Body Control Module Switch Debouncing | Radar Module Power Sequencing |
Use Scenario: Conditioning mechanical door latch switch signals subject to contact bounce and EMI. IC Role / Device Role / Timing Role: Schmitt-trigger inputs debounce switches; 3-state outputs disconnect during sleep mode. Use Value: Reduces firmware polling overhead and eliminates false wake-ups caused by 1–5ms contact oscillation. |
Use Scenario: Enabling/disabling RF front-end bias rails during radar chirp sequence startup and shutdown. IC Role / Device Role / Timing Role: Dual-bank control allows staggered activation of LNA and PA supplies with precise timing alignment. Use Value: Prevents supply rail collapse and ensures clean power ramp rates required for FCC-certified emission profiles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC244AQPWRQ1 | Lower drive (±24mA @ 3.3V only), narrower VCC range (1.65–3.6V), no Schmitt inputs | Not suitable for 5V systems or noisy switch inputs; requires external hysteresis for debouncing | Select only for 3.3V-only designs where cost is prioritized over noise immunity and voltage flexibility |
| MC74VHC244DTG | Non-automotive grade (no AEC-Q100), wider VCC (2–5.5V), same Schmitt inputs and 3-state architecture | Lacks automotive qualification; unsuitable for safety-critical ECU or ADAS modules requiring traceable reliability data | Acceptable for industrial or infotainment subsystems where AEC-Q100 is not mandated |
Compared with SN74LVC244AQPWRQ1 and MC74VHC244DTG, the SN74AC244QPWRQ1 uniquely combines AEC-Q100 Grade 1 qualification, full 1.5–6V operation, and integrated Schmitt-trigger inputs - making it the only option qualified for direct replacement in under-hood signal conditioning without redesign.
Availability
SN74AC244QPWRQ1 is available at Aetrix Electronics and suitable for engine control units, ADAS camera interfaces, body control modules, and radar power sequencing requiring stable component supply across automotive production lifecycles.
Supply support for SN74AC244QPWRQ1 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-grade logic, power management, and signal chain solutions.
The SN74AC244QPWRQ1 belongs to TI's automotive-qualified AC logic family, designed specifically for noise-immune signal buffering and bus isolation in harsh-temperature, high-reliability vehicle subsystems.
FAQ
What is the maximum continuous output current rating for SN74AC244QPWRQ1 at 5V?
The SN74AC244QPWRQ1 supports ±24mA continuous output current per channel at 5V supply, as specified in the Recommended Operating Conditions table. This rating applies across the full -40°C to +125°C temperature range and ensures reliable drive into standard CMOS loads and 50Ω transmission lines without thermal derating.
Does SN74AC244QPWRQ1 support operation below 1.8V, and what is the minimum functional supply voltage?
Yes, SN74AC244QPWRQ1 operates down to 1.5V supply voltage, with validated switching characteristics and input thresholds defined in the Recommended Operating Conditions. At 1.5V, tpd increases to ≤85ns (max), and VIH/VIL thresholds scale proportionally - enabling interoperability with ultra-low-voltage microcontrollers in battery-backed modules.
How does the Schmitt-trigger input hysteresis of SN74AC244QPWRQ1 improve noise immunity in automotive applications?
The Schmitt-trigger inputs of SN74AC244QPWRQ1 provide ~0.4V typical hysteresis at 5V, creating distinct VIH and VIL thresholds that prevent multiple transitions during slow or noisy signal edges. This eliminates false triggering from EMI-coupled transients in engine bays and enables direct connection to unfiltered mechanical switches without external RC networks.
Can both output enable pins (1OE and 2OE) of SN74AC244QPWRQ1 be tied together for single-bank control?
Yes, 1OE and 2OE can be connected to a common control signal, effectively configuring SN74AC244QPWRQ1 as a single 8-channel buffer. However, doing so forfeits independent bank control - a key feature used in applications like staggered power-up sequencing or selective bus isolation - and must be verified against timing requirements in the target system.
What is the purpose of the thermal pad on the RKS package of SN74AC244QPWRQ1, and how should it be connected?
The exposed thermal pad on the SN74AC244QPWRQ1 RKS package improves heat dissipation, lowering junction-to-board thermal resistance to 40.4°C/W. Per the datasheet, it may be connected to GND for enhanced EMC performance or left electrically floating - but must never be connected to VCC or signal nets, as this violates internal isolation design.
SN74AC244QPWRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- 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:
- 24mA, 24mA
- Voltage - Supply:
- 1.5V ~ 6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74AC244QPWRQ1 FAQ
1.How can I place an order for SN74AC244QPWRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AC244QPWRQ1 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 SN74AC244QPWRQ1 reliable?
The price and inventory of SN74AC244QPWRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AC244QPWRQ1 is usually 5 days.
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SN74AC244QPWRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AC244QPWRQ1 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 SN74AC244QPWRQ1?
For technical support, including SN74AC244QPWRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AC244QPWRQ1 requirements.
6.How does Aetrix verify that SN74AC244QPWRQ1 is sourced from the original manufacturer or authorized distributors?
All SN74AC244QPWRQ1 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 SN74AC244QPWRQ1 meets industry standards.
7.What is the process for return or replacement of SN74AC244QPWRQ1?
All SN74AC244QPWRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AC244QPWRQ1, 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 SN74AC244QPWRQ1 part is unused and in its original packaging.
Return procedure for SN74AC244QPWRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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