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Texas Instruments SN74AHC245QPWR
- Part No.:
- SN74AHC245QPWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHC245QPWR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,917
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Product details
Overview
SN74AHC245QPWR from Texas Instruments is an automotive-grade octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between two 8-bit buses. It operates from 2 V to 5.5 V, supports –40°C to 125°C ambient temperature, and features direction control (DIR) and output-enable (OE) logic for isolated bus communication in automotive infotainment backplanes.
For engineers reviewing the SN74AHC245QPWR datasheet, SN74AHC245QPWR pinout, SN74AHC245QPWR application, or SN74AHC245QPWR equivalent, key selection criteria include its TSSOP-20 automotive qualification, 3.3 V/5 V compatible I/O thresholds, 8.4 ns max propagation delay at 3.3 V, and ±25 mA output drive capability under load.
Technical Context
This device implements dual-bus bidirectional data routing via a single DIR input that selects A→B or B→A flow, while OE independently places all outputs in high-impedance state. Its CMOS AHC logic family ensures rail-to-rail output swing and low static current (ICC ≤ 40 µA).
Input thresholds are VIL = 0.9 V and VIH = 2.1 V at VCC = 3 V, enabling reliable interfacing with mixed-voltage systems. The 3-state outputs exhibit fast enable/disable timing: tPZH/tPLZ ≤ 15.5 ns (CL = 15 pF, VCC = 3.3 V), critical for glitch-free bus arbitration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - supports direct interface with 3.3 V and 5 V logic domains without level shifters |
| Operating Temperature | –40°C to 125°C - qualified for under-hood and dashboard electronics per AEC-Q100 stress requirements |
| Propagation Delay | 4 ns min / 6.5 ns max (VCC = 5 V, CL = 15 pF) - enables >100 MHz bus toggle rates in synchronous systems |
| Output Drive | ±8 mA at VCC = 5 V - sufficient to drive 50 pF loads across PCB traces up to 10 cm without signal integrity degradation |
| Input Leakage | ±1 µA max - ensures stable DIR/OE logic states even with weak pull-ups in low-power sleep modes |
| 3-State Off-Leakage | ±2.5 µA max (IOZ) - prevents unintended bus loading during isolation, preserving signal integrity on shared lines |
| ESD Rating | Human Body Model ≥ 2 kV - meets automotive subsystem ESD immunity requirements per ISO 10605 |
Pinout & Package
TSSOP-20 package (PW), 6.5 mm × 4.4 mm footprint, 1.2 mm max height, lead-free NIPDAU finish, MSL Level-1 (260°C peak reflow), RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction Control Input | Low = B→A data flow; High = A→B data flow - determines real-time bus traffic direction without clock or handshake |
| 2–9 (A1–A8) | Bus A I/O Terminals | 8-bit bidirectional data port connected to microcontroller or ASIC side; driven only when OE = Low and DIR matches direction |
| 10 (GND) | Ground Reference | Primary return path for all I/O and internal logic; requires low-inductance connection to minimize ground bounce |
| 11 (VCC) | Supply Voltage | 2–5.5 V power rail; decoupling capacitor (0.1 µF ceramic) required within 5 mm of this pin |
| 12–19 (B1–B8) | Bus B I/O Terminals | 8-bit bidirectional data port connected to peripheral or memory side; electrically identical to A-side pins |
| 20 (OE) | Output Enable Input | Low = transceiver active; High = all A/B pins in high-Z - enables bus isolation during reset or power sequencing |
Key Features
| Feature | Design Value |
|---|---|
| Automotive Qualification | Q-grade device meeting AEC-Q100 requirements for temperature, reliability, and process control in vehicle ECUs |
| Asynchronous Bidirectional Control | Single DIR pin eliminates need for separate transmit/receive control logic, reducing FPGA or MCU GPIO usage by 8+ pins |
| High-Impedance Power-Up State | OE tied to VCC via pull-up ensures buses remain isolated during power ramp, preventing contention on hot-plug interfaces |
| Low Dynamic Power | 14 pF typical Cpd at 5 V - limits switching current to <1.4 mA at 10 MHz, easing thermal design in dense layouts |
| Latch-Up Immunity | Exceeds 250 mA per JESD17 - withstands transient overvoltage events common in 12 V automotive power domains |
Applications
| Automotive Infotainment Backplane | Industrial PLC I/O Expansion |
|---|---|
Use Scenario: Isolating CAN/FlexRay controller data paths from display processor memory buses in head-unit designs. IC Role / Device Role / Timing Role: Bus transceiver managing burst-mode video frame transfers between SoC and external DDR buffer while maintaining electrical isolation during sleep transitions. Use Value: Prevents bus contention during MCU reset sequences and enables independent voltage domain sequencing (3.3 V SoC vs 5 V display driver). | Use Scenario: Extending local I/O modules across DIN-rail-mounted PLC racks using daisy-chained parallel buses. IC Role / Device Role / Timing Role: Octal-level shifter and isolator enabling deterministic 100 kHz scan-cycle updates between master CPU and remote analog input cards. Use Value: Eliminates need for discrete level translators and reduces inter-rack wiring count by 50% versus serial alternatives. |
| Automotive ADAS Sensor Hub Interface | Medical Imaging Data Aggregation |
Use Scenario: Multiplexing raw pixel streams from multiple camera sensors into a central vision processor in surround-view systems. IC Role / Device Role / Timing Role: Synchronized bidirectional data conduit supporting 8-bit parallel sensor readout at 25 MHz pixel clock rates. Use Value: Achieves sub-10 ns channel-to-channel skew across all 8 lanes, preserving image timing integrity without FPGA-based deskew logic. | Use Scenario: Consolidating ADC outputs from multi-channel ultrasound front-ends into a unified digital back-end processor. IC Role / Device Role / Timing Role: High-fidelity bus repeater ensuring <1 LSB gain error across 8 simultaneous 12-bit analog channels sampled at 40 MSPS. Use Value: Maintains DC-coupled signal integrity with <0.1% THD+N across full bandwidth due to matched rise/fall times (tPLH = tPHL). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245APWRE4 | Lower VCC range (1.65–3.6 V); 32 mA drive; non-automotive grade | Suitable for consumer portable devices but lacks AEC-Q100 qualification and 5 V tolerance | Select only for cost-sensitive 3.3 V-only systems where automotive reliability is not required |
| MC74VHC245DT | Same pinout; wider temp range (–55°C to 125°C); higher ICC (100 µA max) | Used in aerospace/military applications; no automotive-specific process controls or change notification | Prefer for extreme-temperature environments outside automotive scope; verify latch-up rating separately |
Compared with SN74AHC245QPWR, SN74LVC245APWRE4 offers higher drive strength but sacrifices 5 V compatibility and automotive qualification, while MC74VHC245DT provides broader temperature coverage at the expense of higher quiescent current and no AEC-Q100 traceability.
Availability
SN74AHC245QPWR is available at Aetrix Electronics and suitable for automotive infotainment backplanes, industrial PLC I/O expansion, and ADAS sensor hub interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74AHC245QPWR 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, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The SN74AHC245Q series belongs to TI's automotive-qualified logic portfolio, engineered specifically for robust bidirectional data routing in harsh-temperature vehicle subsystems where signal integrity and long-term reliability are mandatory.
FAQ
What is the maximum operating frequency supported by SN74AHC245QPWR in a 50 pF load configuration?
The SN74AHC245QPWR achieves a maximum propagation delay of 8.5 ns (tPLH/tPHL) at VCC = 5 V with CL = 50 pF. This corresponds to a theoretical maximum toggle frequency of ~59 MHz for sustained data transfer, assuming setup/hold margins are maintained in the system design. Real-world bus clock rates depend on board layout, termination, and driver strength.
Does SN74AHC245QPWR require external pull-up resistors on DIR or OE pins?
OE must be tied to VCC through a pull-up resistor to ensure high-impedance state during power-up; TI specifies minimum resistance based on driver sink capability, typically 10 kΩ. DIR has no such requirement and may be driven directly from CMOS logic or left unconnected only if actively controlled - floating DIR is prohibited per SCBA004 guidelines.
Can SN74AHC245QPWR interface between 3.3 V and 5 V buses without level-shifting circuitry?
Yes - SN74AHC245QPWR supports mixed-voltage operation: inputs are 5.5 V tolerant regardless of VCC, and outputs swing rail-to-rail. When VCC = 3.3 V, it safely drives 5 V-tolerant receivers; when VCC = 5 V, it accepts 3.3 V logic levels as valid inputs (VIH = 3.85 V max at VCC = 5.5 V ensures margin).
What is the thermal resistance (θJA) of the SN74AHC245QPWR in its TSSOP-20 package?
The SN74AHC245QPWR in TSSOP-20 (PW) package has a specified junction-to-ambient thermal resistance (θJA) of 83°C/W under standard JEDEC test conditions (1-layer board, 1 in² copper). Actual θJA in end equipment depends on PCB copper area, airflow, and nearby heat sources - derating is required above 85°C ambient.
Is SN74AHC245QPWR pin-compatible with SN74AHC245QDWR in SOIC-20?
Yes - SN74AHC245QPWR (TSSOP-20) and SN74AHC245QDWR (SOIC-20) share identical pin numbering, function mapping, and logic behavior. However, their footprints are not interchangeable: TSSOP requires 0.65 mm pitch land patterns, while SOIC uses 1.27 mm pitch. PCB redesign is necessary for package substitution.
SN74AHC245QPWR 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:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74AHC245QPWR FAQ
1.How can I place an order for SN74AHC245QPWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC245QPWR 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 SN74AHC245QPWR reliable?
The price and inventory of SN74AHC245QPWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC245QPWR is usually 5 days.
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SN74AHC245QPWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC245QPWR 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 SN74AHC245QPWR?
For technical support, including SN74AHC245QPWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC245QPWR requirements.
6.How does Aetrix verify that SN74AHC245QPWR is sourced from the original manufacturer or authorized distributors?
All SN74AHC245QPWR 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 SN74AHC245QPWR meets industry standards.
7.What is the process for return or replacement of SN74AHC245QPWR?
All SN74AHC245QPWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC245QPWR, 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 SN74AHC245QPWR part is unused and in its original packaging.
Return procedure for SN74AHC245QPWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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