My Inquiry
My Account
Texas Instruments SN74AHC244QDWRQ1
- Part No.:
- SN74AHC244QDWRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AHC244QDWRQ1.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:611
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74AHC244QDWRQ1 from Texas Instruments is an automotive-grade octal 3-state buffer/driver IC with dual 4-bit channels, 2V–5.5V supply operation, ±8mA output drive at 5V, and −40°C to +125°C temperature range-used for bus interfacing, memory address driving, and clock distribution in vehicle control modules.
For engineers reviewing the SN74AHC244QDWRQ1 datasheet, SN74AHC244QDWRQ1 pinout, SN74AHC244QDWRQ1 application, or SN74AHC244QDWRQ1 equivalent, this page delivers verified functional modes, SOIC-20 package details, switching timing under 15pF/50pF loads, automotive qualification evidence (AEC-Q100), and real-world implementation guidance for high-reliability embedded systems.
Technical Context
The SN74AHC244QDWRQ1 implements two independent 4-bit noninverting buffers, each controlled by a dedicated 3-state output-enable input (1OE, 2OE). Its EPIC™ CMOS process enables rail-to-rail logic swing, low static current (≤40μA), and robust noise immunity (VIH(D) = 3.5V, VIL(D) = 1.5V at 5V).
Functional behavior is strictly defined: when OE is low, Y = A; when OE is high, outputs enter high-impedance state. Power-up/down high-Z integrity requires OE tied to VCC via pullup resistor-critical for hot-swap and bus arbitration in automotive domain controllers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 5.5V - supports mixed-voltage system interfacing (e.g., 3.3V MCU to 5V peripheral bus) |
| IOL / IOH | ±8mA at 5V - drives standard TTL loads and 50pF PCB traces without external buffering |
| tPLH / tPHL | 3.9ns max at 5V/15pF - enables reliable 100+ MHz bus operation in CAN/LIN gateway timing paths |
| Operating Temp | −40°C to +125°C - qualified per AEC-Q100 Grade 1 for engine bay and ADAS ECU deployment |
| ESD Rating | ±1500V HBM - meets automotive board-level ESD immunity requirements without added protection diodes |
| ICC (Quiescent) | 4μA typical at 5.5V - minimizes standby power in always-on vehicle networks (e.g., body control modules) |
| Input Capacitance | 2pF - reduces capacitive loading on upstream drivers and preserves signal edge rate in daisy-chained buses |
Pinout & Package
SN74AHC244QDWRQ1 uses SOIC-20 (DW) package: 12.80mm × 10.3mm body-with-pins, 12.8mm × 7.5mm body-only, 2.65mm max height, JEDEC MS-013 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low 3-state enable inputs - must be pulled high during power-up to prevent bus contention |
| 2, 4, 6, 8, 11, 13, 15, 17 | 1A1–1A4, 2A1–2A4 | Buffer input pins - eight total; unused inputs must be tied to VCC or GND to avoid floating logic states |
| 3, 5, 7, 9, 12, 14, 16, 18 | 2Y4–2Y1, 1Y4–1Y1 | Buffer output pins - grouped as two independent 4-bit channels with separate OE control |
| 10 | GND | Ground reference - requires low-inductance connection to PCB ground plane for noise suppression |
| 20 | VCC | Power supply - needs local 0.1μF ceramic bypass capacitor placed ≤2mm from pin per TI layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Qualified | Grade 1 (−40°C to +125°C) - certified for safety-critical automotive subsystems including powertrain and chassis control |
| Dual Independent OE Control | Enables selective channel isolation - allows one 4-bit bus segment to remain active while another is tri-stated for diagnostics or firmware update |
| Low Propagation Delay | 3.9ns max (5V/15pF) - supports high-speed data capture in sensor fusion modules with tight timing budgets |
| High Noise Immunity | VIH(D) = 3.5V, VIL(D) = 1.5V at 5V - rejects coupled transients from ignition systems and motor drivers |
| EPIC™ CMOS Process | Delivers rail-to-rail VOH/VOL, sub-μA leakage, and stable performance across full automotive temperature range |
Applications
| Automotive Body Control Module (BCM) | Infotainment System Bus Interface |
|---|---|
|
Use Scenario: Isolating microcontroller GPIOs from high-capacitance door lock actuator wiring harnesses. IC Role / Device Role / Timing Role: Octal buffer provides level-shifted, current-boosted, and directionally isolated drive between 3.3V MCU and 12V-compatible load switches. Use Value: Prevents backfeed into MCU I/Os during load dump events and enables software-controlled bus arbitration during sleep/wake transitions. |
Use Scenario: Driving parallel LCD segment lines and touch controller interface signals in head unit displays. IC Role / Device Role / Timing Role: 3-state buffer acts as bidirectional bus repeater between SoC display controller and panel timing IC, synchronized to pixel clock edges. Use Value: Eliminates signal degradation over 80mm flex cable runs and ensures clean rise/fall times (<10ns) required for 60Hz RGB888 video timing. |
| ADAS Camera Sensor Hub | Electric Power Steering (EPS) ECU |
|
Use Scenario: Buffering MIPI CSI-2 D-PHY clock and data lanes before fanout to multiple image processors. IC Role / Device Role / Timing Role: Noninverting driver maintains signal integrity of 1.2GHz differential pairs by reducing source impedance and suppressing reflections. Use Value: Enables deterministic jitter margin (≤0.3UI) at receiver input, meeting ISO 26262 ASIL-B timing validation requirements. |
Use Scenario: Interfacing torque sensor analog outputs and motor phase feedback signals to 32-bit safety MCU ADC inputs. IC Role / Device Role / Timing Role: Level-shifting buffer isolates sensitive analog front-end from digital switching noise generated by gate drivers. Use Value: Achieves >60dB PSRR at 100kHz switching frequency, preventing torque estimation drift during motor commutation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LV244AQPWRQ1 | Lower VCC range (1.65V–5.5V); 16mA IOL at 3.3V; higher input capacitance (4.5pF) | Better suited for 1.8V/3.3V-only systems; less ideal for mixed 2.5V/5V buses due to reduced noise margin | Select when operating exclusively below 3.3V and higher drive strength is needed without increasing supply voltage |
| MC74VHC244DTG | Non-automotive grade; −40°C to +105°C; no AEC-Q100 certification; 8mA IOL at 5V | Approved only for industrial/commercial use; not validated for automotive vibration, thermal cycling, or long-term reliability | Acceptable for prototyping or non-safety automotive subsystems where qualification documentation is not required |
Compared with SN74LV244AQPWRQ1 and MC74VHC244DTG, the SN74AHC244QDWRQ1 uniquely combines AEC-Q100 Grade 1 qualification, 2V minimum VCC support for battery brownout resilience, and optimized propagation delay for real-time control loops-making it the default choice for production automotive ECUs requiring functional safety compliance.
Availability
SN74AHC244QDWRQ1 is available at Aetrix Electronics and suitable for automotive body control, infotainment interface, and ADAS sensor hub designs requiring stable component supply across extended product lifecycles.
Supply support for SN74AHC244QDWRQ1 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 ICs, with decades of automotive qualification expertise and ISO/TS 16949-certified manufacturing.
The SN74AHC244QDWRQ1 belongs to TI's AHC logic family designed specifically for high-reliability automotive bus interfacing-emphasizing wide VCC tolerance, robust ESD immunity, and guaranteed operation across extreme temperature gradients.
FAQ
What is the maximum output current capability of the SN74AHC244QDWRQ1 at 5V supply?
The SN74AHC244QDWRQ1 delivers ±8mA output current (IOL/IOH) at VCC = 5V ± 0.5V, as specified in Section 4.3 Recommended Operating Conditions and confirmed in Table 4-5 Electrical Characteristics. This rating applies per output pin under steady-state conditions and supports direct driving of standard TTL loads and moderate PCB trace capacitance without external amplification. Exceeding this current may cause VOL/VOH shift beyond specification limits.
Does the SN74AHC244QDWRQ1 support hot-swap operation on live buses?
Yes-the SN74AHC244QDWRQ1 supports hot-swap operation when OE inputs are externally pulled high via appropriate resistors (per Section 6.1 Overview), ensuring outputs remain in high-impedance state during power-up/down sequences. Its ±1500V HBM ESD rating and rail-to-rail input voltage tolerance (−0.5V to VCC + 0.5V) further protect against transient coupling during insertion/removal in vehicle diagnostic ports or modular ECUs.
How does the SN74AHC244QDWRQ1 differ from the commercial-grade SN74AHC244?
The SN74AHC244QDWRQ1 is the automotive-qualified variant: it undergoes AEC-Q100 stress testing (Grade 1, −40°C to +125°C), features enhanced process controls for long-term reliability, and carries automotive-specific part marking (AHC244Q1). Electrically identical to the catalog version, it differs only in qualification scope, traceability, and packaging-enabling drop-in replacement in safety-critical systems where qualification documentation is mandatory.
What is the recommended bypass capacitor value for the SN74AHC244QDWRQ1 VCC pin?
Texas Instruments recommends a 0.1μF ceramic capacitor placed within 2mm of the VCC pin (Pin 20) on the SN74AHC244QDWRQ1, as stated in Section 7.1 Power Supply Recommendations. For multi-VCC designs or noisy environments, paralleling with a 1μF capacitor improves low-frequency decoupling. The capacitor must be X7R or better dielectric, rated ≥10V, and mounted directly to solid ground plane to minimize inductance and suppress switching noise.
Can unused inputs on the SN74AHC244QDWRQ1 be left floating?
No-unused inputs on the SN74AHC244QDWRQ1 must be tied to VCC or GND, as explicitly required in Section 7.2 Layout Guidelines and Table 6-1 Device Functional Modes. Floating CMOS inputs cause undefined logic states, increased ICC, and potential oscillation due to noise coupling. TI's application report SCBA004 confirms that uncontrolled input voltages may exceed VIH/VIL thresholds, leading to erratic output behavior or excessive power dissipation in automotive operating conditions.
SN74AHC244QDWRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74AHC244QDWRQ1 FAQ
1.How can I place an order for SN74AHC244QDWRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC244QDWRQ1 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 SN74AHC244QDWRQ1 reliable?
The price and inventory of SN74AHC244QDWRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC244QDWRQ1 is usually 5 days.
3.What payment methods are accepted for SN74AHC244QDWRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHC244QDWRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHC244QDWRQ1?
SN74AHC244QDWRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC244QDWRQ1 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 SN74AHC244QDWRQ1?
For technical support, including SN74AHC244QDWRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC244QDWRQ1 requirements.
6.How does Aetrix verify that SN74AHC244QDWRQ1 is sourced from the original manufacturer or authorized distributors?
All SN74AHC244QDWRQ1 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 SN74AHC244QDWRQ1 meets industry standards.
7.What is the process for return or replacement of SN74AHC244QDWRQ1?
All SN74AHC244QDWRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC244QDWRQ1, 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 SN74AHC244QDWRQ1 part is unused and in its original packaging.
Return procedure for SN74AHC244QDWRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74AHC244QDWRQ1 Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
