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Texas Instruments SN74AHC244QPWRQ1
- Part No.:
- SN74AHC244QPWRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHC244QPWRQ1.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,690
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Product details
Overview
SN74AHC244QPWRQ1 from Texas Instruments is an automotive-qualified octal 3-state buffer/driver IC used for bus interfacing, memory address driving, and clock distribution in AEC-Q100 Grade 1 systems. It operates from 2 V to 5.5 V, supports −40°C to +125°C ambient, delivers ±8 mA output drive at 5 V, and features 3.9 ns typical propagation delay (VCC = 5 V, CL = 15 pF).
For engineers reviewing the SN74AHC244QPWRQ1 datasheet, SN74AHC244QPWRQ1 pinout, SN74AHC244QPWRQ1 application, or SN74AHC244QPWRQ1 equivalent, key selection criteria include its dual 4-bit independent enable architecture, high-speed 3-state bus isolation, automotive temperature range compliance, and TSSOP-20 package compatibility with space-constrained ECUs and ADAS modules.
Technical Context
The SN74AHC244QPWRQ1 implements two independent 4-bit noninverting buffers, each with dedicated 3-state output-enable (OE) control-1OE governs Y1–Y4 outputs, 2OE governs Y1–Y4 of the second group. Logic operation follows positive-logic truth table: when OE is low, A→Y pass-through occurs; when OE is high, outputs enter high-impedance state.
It uses TI's EPIC™ (Enhanced-Performance Implanted CMOS) process for robust noise immunity and rail-to-rail input voltage tolerance (0 V to VCC). Input transition rate is specified at 20 ns/V (VCC = 5 V), and dynamic noise margins meet AEC-Q100 requirements for automotive signal integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - Enables interoperability across 3.3 V and 5 V logic domains in mixed-supply automotive subsystems. |
| Operating Temperature | −40°C to +125°C - Qualified per AEC-Q100 Grade 1 for engine bay, transmission, and ADAS ECU deployment. |
| IOL / IOH | ±8 mA at VCC = 5 V - Sufficient drive strength to fan out to ≥10 LS-TTL loads or terminate short PCB traces without external buffering. |
| tPLH / tPHL | 3.9 ns (typ, VCC = 5 V, CL = 15 pF) - Supports >100 MHz bus toggle rates in CAN/LIN gateway or sensor interface timing budgets. |
| IOZ (Off-State Leakage) | ±2.5 μA max at VCC = 5.5 V - Ensures minimal current leakage during sleep mode, critical for low-power vehicle keep-alive functions. |
| ESD Rating | ±1500 V HBM - Meets automotive system-level ESD robustness requirements per ISO 10605 and AEC-Q100-002. |
| Power Dissipation Cap | 8.6 pF (Cpd, f = 1 MHz) - Predictable dynamic power consumption enables accurate thermal modeling in dense PCB layouts. |
Pinout & Package
TSSOP-20 (PW) package: 6.50 mm × 6.40 mm body size, 1.2 mm max height, 0.65 mm lead pitch, RoHS-compliant NiPdAu lead finish, MSL Level-1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE / 2OE | Active-low output-enable inputs - Independently disable Group 1 (pins 2,4,6,8 → 18,16,14,12) or Group 2 (pins 11,13,15,17 → 3,5,7,9) to isolate bidirectional buses. |
| 2,4,6,8,11,13,15,17 | A inputs | Eight buffered data inputs - Accept TTL/CMOS-compatible logic levels; unused inputs must be tied to VCC or GND to prevent floating-induced shoot-through. |
| 3,5,7,9,12,14,16,18 | Y outputs | Eight 3-state outputs - High-impedance state eliminates bus contention during arbitration or power sequencing; outputs float when disabled. |
| 10 | GND | Ground reference - Requires local 0.1 μF ceramic bypass capacitor placed ≤2 mm from pin to suppress switching noise on shared ground planes. |
| 20 | VCC | Supply pin - Must be decoupled with 0.1 μF capacitor; multiple VCC pins not present, so single-point decoupling suffices. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 qualified - Validated for continuous operation at +125°C ambient, enabling use in under-hood and powertrain control units. |
| Dual independent OE control | Separate 1OE and 2OE pins - Allows selective activation of two 4-bit data paths, simplifying time-multiplexed bus sharing in multi-sensor clusters. |
| Rail-to-rail input voltage | VI range = 0 V to VCC - Accepts full-swing signals across supply voltages without level-shifting, reducing BOM count in mixed-voltage domains. |
| Low dynamic power | Cpd = 8.6 pF - Minimizes switching current in high-frequency applications such as camera link serialization or radar clock forwarding. |
| High noise immunity | VIL(D) = 1.5 V, VIH(D) = 3.5 V at VCC = 5 V - Provides >1.5 V noise margin against coupled transients in electrically noisy chassis environments. |
Applications
| Automotive Body Control Module (BCM) | ADAS Camera Interface Hub |
|---|---|
Use Scenario: Isolating LIN bus transceiver I/O from microcontroller GPIO during sleep/wake transitions to prevent spurious wakeups. IC Role / Device Role / Timing Role: 3-state buffer controlling data direction and enabling/disabling physical layer access based on MCU command. Use Value: Eliminates bus contention during low-power states; ±8 mA drive ensures reliable signal integrity over 10 m LIN harnesses. |
Use Scenario: Multiplexing parallel image data streams from dual cameras into a single MIPI CSI-2 serializer input. IC Role / Device Role / Timing Role: Octal noninverting buffer providing clean, low-skew signal replication with simultaneous 3-state control for channel arbitration. Use Value: 3.9 ns propagation delay preserves pixel timing alignment; dual OE allows seamless handoff between camera sources without frame loss. |
| Engine Control Unit (ECU) Address Bus Driver | Electric Power Steering (EPS) Motor Controller |
Use Scenario: Driving 16-bit memory-mapped peripheral address lines from a 32-bit MCU in safety-critical engine management firmware. IC Role / Device Role / Timing Role: Address line buffer with independent enable groups supporting segmented memory access and diagnostic read/write isolation. Use Value: AEC-Q100 qualification ensures functional safety compliance; 2 V–5.5 V operation matches legacy 5 V sensor interfaces and modern 3.3 V MCUs. |
Use Scenario: Level-shifting and isolating PWM gate driver control signals from isolated MCU domain in ISO 26262 ASIL-B motor control loop. IC Role / Device Role / Timing Role: Signal conditioner and bus isolator between MCU output and isolated gate driver inputs, preventing fault propagation. Use Value: ±1500 V HBM ESD rating protects against field-induced transients; high-impedance state prevents unintended FET turn-on during reset sequences. |
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 |
|---|---|---|---|
| SN74LVC244AQPWRQ1 | Lower VCC min (1.65 V), higher IOL (24 mA at 3.3 V), but reduced noise margin (VIH(D) = 2.0 V at 3.3 V) | Better suited for 1.8 V/3.3 V-only systems; less robust in 5 V mixed-noise environments | Select when operating exclusively below 3.6 V and requiring higher drive strength; verify noise immunity in high-EMI EPS or inverter zones. |
| MC74VHC244DTG | Non-automotive grade (industrial temp only), identical pinout and logic function, lower ESD rating (±2 kV HBM) | Lacks AEC-Q100 qualification; unsuitable for safety-critical or under-hood deployment | Acceptable for prototyping or non-automotive industrial controls; not approved for production vehicle ECUs per OEM requirements. |
Compared with SN74LVC244AQPWRQ1 and MC74VHC244DTG, the SN74AHC244QPWRQ1 uniquely balances wide supply range (2–5.5 V), AEC-Q100 Grade 1 compliance, and proven noise immunity-making it the preferred choice for production automotive bus drivers where voltage flexibility and reliability are mandatory.
Availability
SN74AHC244QPWRQ1 is available at Aetrix Electronics and suitable for automotive body control, ADAS sensor hubs, engine management systems, and electric power steering modules requiring stable component supply across extended product lifecycles.
Supply support for SN74AHC244QPWRQ1 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 silicon, with decades of automotive qualification expertise and AEC-Q100-compliant manufacturing infrastructure.
The SN74AHC244QPWRQ1 belongs to TI's automotive logic portfolio, designed specifically for robust bus interfacing, memory addressing, and clock distribution in safety-critical vehicle subsystems operating across extreme temperature and EMI conditions.
FAQ
What is the maximum operating temperature for the SN74AHC244QPWRQ1?
The SN74AHC244QPWRQ1 is rated for continuous operation from −40°C to +125°C ambient temperature and is AEC-Q100 Grade 1 qualified. This specification is validated per TI's automotive qualification test plan and applies to the SN74AHC244QPWRQ1 in its TSSOP-20 (PW) package under recommended operating conditions including proper PCB thermal design and airflow.
Does the SN74AHC244QPWRQ1 support 3.3 V logic levels?
Yes, the SN74AHC244QPWRQ1 fully supports 3.3 V logic operation: its VCC range includes 3.3 V ± 0.3 V, VIH is 2.1 V (min) and VIL is 0.9 V (max) at that supply, and it delivers ±4 mA output drive-meeting standard LVTTL and 3.3 V CMOS interface requirements. The SN74AHC244QPWRQ1 maintains full functionality across 2 V to 5.5 V without level shifters.
How many independent output-enable controls does the SN74AHC244QPWRQ1 have?
The SN74AHC244QPWRQ1 has two independent active-low output-enable inputs: 1OE (pin 1) controls outputs Y1–Y4 of the first 4-bit group, and 2OE (pin 19) controls outputs Y1–Y4 of the second group. This architecture enables selective bus isolation-for example, disabling one sensor interface while keeping another active-without requiring external logic or additional ICs.
Is the SN74AHC244QPWRQ1 pin-compatible with the commercial SN74AHC244?
Yes, the SN74AHC244QPWRQ1 shares identical pinout, electrical behavior, and functional logic with the commercial SN74AHC244 in the same TSSOP-20 (PW) package. However, the SN74AHC244QPWRQ1 adds AEC-Q100 qualification, enhanced screening, and automotive-grade reliability testing-making it a drop-in replacement where automotive qualification is required.
What is the recommended bypass capacitor for the SN74AHC244QPWRQ1 VCC pin?
Texas Instruments recommends a 0.1 μF ceramic capacitor placed within 2 mm of the VCC pin (pin 20) and GND (pin 10) for the SN74AHC244QPWRQ1. This value is validated for noise suppression across 1 MHz–100 MHz switching frequencies and is specified in TI's layout guidelines for AHC-family devices. For systems with multiple logic ICs, adding a bulk 1 μF capacitor nearby further stabilizes rail voltage during transient load changes.
SN74AHC244QPWRQ1 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74AHC244QPWRQ1 FAQ
1.How can I place an order for SN74AHC244QPWRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC244QPWRQ1 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 SN74AHC244QPWRQ1 reliable?
The price and inventory of SN74AHC244QPWRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC244QPWRQ1 is usually 5 days.
3.What payment methods are accepted for SN74AHC244QPWRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHC244QPWRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHC244QPWRQ1?
SN74AHC244QPWRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC244QPWRQ1 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 SN74AHC244QPWRQ1?
For technical support, including SN74AHC244QPWRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC244QPWRQ1 requirements.
6.How does Aetrix verify that SN74AHC244QPWRQ1 is sourced from the original manufacturer or authorized distributors?
All SN74AHC244QPWRQ1 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 SN74AHC244QPWRQ1 meets industry standards.
7.What is the process for return or replacement of SN74AHC244QPWRQ1?
All SN74AHC244QPWRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC244QPWRQ1, 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 SN74AHC244QPWRQ1 part is unused and in its original packaging.
Return procedure for SN74AHC244QPWRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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