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Texas Instruments SN74AHCT245QPWRQ1
- Part No.:
- SN74AHCT245QPWRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHCT245QPWRQ1.pdf
- Description:
- OCTAL BUS TRANSCEIVER WITH TRI-S
- Quantity:
- Payment:
- Shipping:
Inventory:1,840
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Product details
Overview
SN74AHCT245QPWRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive octal bus transceiver with 3-state outputs, operating from 4.5 V to 5.5 V, supporting bidirectional data flow between A and B buses via DIR control, and enabling bus isolation via OE-used in vehicle body control modules for signal routing between microcontrollers and peripheral clusters.
For engineers reviewing the SN74AHCT245QPWRQ1 datasheet, SN74AHCT245QPWRQ1 pinout, SN74AHCT245QPWRQ1 application, or SN74AHCT245QPWRQ1 equivalent, key selection considerations include its TTL-compatible inputs (VIH = 2 V, VIL = 0.8 V), ±25 mA output drive, 10 ns typical propagation delay at 15 pF load, and dual-package availability (TSSOP-20/PW and VSSOP-20/DGS) with automotive temperature range (–40°C to +125°C).
Technical Context
The SN74AHCT245QPWRQ1 implements asynchronous bidirectional bus communication using a single DIR input to select data direction (A→B or B→A) and an active-low OE input to place all I/Os in high-impedance state. Its CMOS design with TTL-voltage-compatible inputs enables direct interfacing with legacy 3.3 V logic while operating at 5 V.
It features slow edge-rate control to minimize output ringing and overshoot, supports voltage translation from 3.3 V to 5 V, and includes latch-up immunity exceeding 250 mA per JESD17-critical for robust operation in noisy automotive power domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with automotive 5 V rail tolerances and avoids under-voltage lockout in cold-cranking conditions. |
| Operating Temperature | –40°C to +125°C - qualified per AEC-Q100 Grade 1 for under-hood and cabin control unit deployment. |
| Propagation Delay | 7.7 ns max (CL = 15 pF) - enables reliable timing in 20–25 MHz bus interfaces without added wait states. |
| Output Drive | ±8 mA (IOH/IOL) - sufficient to drive standard CMOS loads and short PCB traces without external buffering. |
| Input Compatibility | TTL-level (VIH = 2 V, VIL = 0.8 V) - allows direct connection to legacy 3.3 V MCU GPIOs without level-shifting circuitry. |
| ESD Rating | ±2000 V HBM - meets automotive ESD immunity requirements for assembly and field operation. |
| Power Dissipation Cap. | 13 pF - low dynamic capacitance reduces switching current and improves power efficiency in always-on modules. |
Pinout & Package
TSSOP-20 (PW) package: 6.5 mm × 6.4 mm footprint, 1.2 mm max height, lead pitch 0.65 mm, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIR (Pin 1) | Direction Control Input | Logic level selects data path: DIR = L enables B→A transfer; DIR = H enables A→B transfer. |
| OE (Pin 19) | Output Enable Input | Active-low control: OE = L enables transceiver; OE = H places all A/B I/Os in high-Z for bus isolation. |
| A1–A8 (Pins 2–9) | Port A I/O Terminals | Bidirectional data lines connected to one bus segment; internally isolated when OE = H. |
| B1–B8 (Pins 11–18) | Port B I/O Terminals | Bidirectional data lines connected to second bus segment; functionally mirrored to A-side. |
| GND (Pin 10) | Ground Reference | Primary return path for all I/O and supply currents; must be low-inductance connection in automotive PCB layout. |
| VCC (Pin 20) | Power Supply | 5 V nominal supply; requires local 0.1 µF ceramic bypass capacitor per TI layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for continuous operation from –40°C to +125°C ambient, meeting automotive reliability and lifetime requirements. |
| TTL-compatible inputs | Accepts 3.3 V logic high/low levels directly-eliminates need for external level shifters in mixed-voltage systems. |
| Slow edge-rate control | Reduces output ringing and EMI emissions on long PCB traces, critical for EMC compliance in vehicle networks. |
| High-impedance isolation | OE-controlled 3-state outputs prevent bus contention during MCU reset or firmware update sequences. |
| Latch-up immunity | Exceeds 250 mA per JESD17-ensures survivability during transient overcurrent events in automotive power domains. |
Applications
| Body Control Module Signal Routing | Instrument Cluster Data Bridging |
|---|---|
Use Scenario: Isolating CAN microcontroller I/O from LIN-connected sensors during sleep mode while maintaining wake-up capability via DIR/OE sequencing. IC Role / Device Role / Timing Role: Bidirectional bus transceiver managing data handoff between 5 V MCU peripherals and 3.3 V sensor interface ICs. Use Value: Enables voltage-level bridging and controlled bus arbitration without adding discrete MOSFET switches or dedicated level translators. | Use Scenario: Synchronizing display refresh signals between graphics controller and segmented LCD driver across separate voltage domains. IC Role / Device Role / Timing Role: Octal data channel translator ensuring glitch-free pixel data transfer during power-state transitions. Use Value: Provides deterministic 3-state control and sub-10 ns propagation delay to meet tight display timing budgets. |
| Door Module Switch Debouncing | ADAS Camera Interface Buffering |
Use Scenario: Conditioning mechanical switch inputs before feeding to vehicle security MCU, using OE to hold stable state during controller reset. IC Role / Device Role / Timing Role: Digital signal conditioner with configurable direction and enable for noise-immune switch sampling. Use Value: Eliminates software debounce overhead and prevents false triggers caused by floating inputs during MCU initialization. | Use Scenario: Buffering parallel camera sensor output (e.g., OV5640) to image processor in rear-view camera system with shared 5 V rail. IC Role / Device Role / Timing Role: High-speed data conduit isolating sensor interface from processor-side noise and supply fluctuations. Use Value: Maintains signal integrity across 20 cm flex cable runs with <10 ns skew between data bits, verified per TI switching characteristics table. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245AQPWRQ1 | Lower VCC range (1.65–3.6 V); 3.3 V native operation; higher speed (tPD = 5.2 ns typ); no TTL input compatibility. | Requires 3.3 V supply only; unsuitable for 5 V bus environments without level shifting. | Select when system operates exclusively at 3.3 V and demands faster throughput. |
| MC74VHC245DTG | Non-automotive grade; wider VCC range (2–5.5 V); same pinout; lower ESD rating (HBM ±2 kV vs. ±2 kV-identical); no AEC-Q100 certification. | Not qualified for automotive use; limited to industrial or consumer applications with less stringent reliability requirements. | Select only for non-automotive designs where AEC-Q100 compliance is not mandated. |
Compared with SN74AHCT245QPWRQ1, the SN74LVC245AQPWRQ1 offers higher speed but sacrifices 5 V bus compatibility and TTL input support, while the MC74VHC245DTG matches pinout and voltage range but lacks automotive qualification and long-term supply assurance for vehicle programs.
Availability
SN74AHCT245QPWRQ1 is available at Aetrix Electronics and suitable for automotive body control units, instrument cluster subsystems, door module interfaces, and ADAS camera data routing requiring stable component supply across extended product lifecycles.
Supply support for SN74AHCT245QPWRQ1 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 delivering analog and embedded processing solutions, with over 90 years of innovation in automotive, industrial, and communications markets.
The SN74AHCT245QPWRQ1 belongs to TI's automotive-qualified logic portfolio, designed specifically for robust bidirectional data routing in vehicle electronic control units where voltage translation, ESD resilience, and thermal stability are mandatory.
FAQ
What is the maximum operating temperature for SN74AHCT245QPWRQ1?
The SN74AHCT245QPWRQ1 is AEC-Q100 Grade 1 qualified with a guaranteed operating free-air temperature range of –40°C to +125°C. This specification is validated across process corners and lifetime stress tests, making SN74AHCT245QPWRQ1 suitable for under-hood applications such as engine control modules and transmission control units where ambient temperatures exceed 105°C.
Does SN74AHCT245QPWRQ1 support 3.3 V logic inputs?
Yes, SN74AHCT245QPWRQ1 supports 3.3 V logic inputs directly due to its TTL-compatible input thresholds: VIH = 2.0 V min and VIL = 0.8 V max at VCC = 4.5–5.5 V. This allows seamless interfacing with 3.3 V microcontrollers and FPGAs without external level-shifting circuitry-confirmed in Section 5.3 Recommended Operating Conditions of the official datasheet.
What package type is used for SN74AHCT245QPWRQ1?
SN74AHCT245QPWRQ1 uses the TSSOP-20 (PW) package: 6.5 mm × 6.4 mm body size, 0.65 mm lead pitch, 1.2 mm maximum height, with NiPdAu lead finish and MSL Level-1 rating. This surface-mount package is optimized for automated assembly and thermal performance in automotive PCBs, as documented in TI's PACKAGE OPTION ADDENDUM dated 7-Nov-2025.
Can SN74AHCT245QPWRQ1 be used for voltage translation?
Yes, SN74AHCT245QPWRQ1 enables unidirectional voltage translation from 3.3 V to 5 V. Its inputs accept VIH ≥ 2 V and VIL ≤ 0.8 V while operating at VCC = 5 V, allowing 3.3 V logic signals to reliably control the device. Outputs swing rail-to-rail (VOH ≥ 3.7 V, VOL ≤ 0.44 V at IOL = 8 mA), providing clean 5 V logic levels to downstream 5 V receivers-verified in Electrical Characteristics Table 5.5.
How does the OE pin function on SN74AHCT245QPWRQ1?
The OE (Output Enable) pin on SN74AHCT245QPWRQ1 is an active-low control that places all A- and B-side I/Os into high-impedance state when asserted high. When OE = L, the transceiver operates normally based on DIR state; when OE = H, both ports are electrically isolated-critical for preventing bus contention during MCU reset or firmware updates. TI recommends pulling OE to VCC via a resistor during power-up to ensure safe default isolation.
SN74AHCT245QPWRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- 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:
- Schmitt Trigger
- Output Type:
- 3-State
- Current - Output High, Low:
- 8mA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74AHCT245QPWRQ1 FAQ
1.How can I place an order for SN74AHCT245QPWRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT245QPWRQ1 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 SN74AHCT245QPWRQ1 reliable?
The price and inventory of SN74AHCT245QPWRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT245QPWRQ1 is usually 5 days.
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SN74AHCT245QPWRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT245QPWRQ1 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 SN74AHCT245QPWRQ1?
For technical support, including SN74AHCT245QPWRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT245QPWRQ1 requirements.
6.How does Aetrix verify that SN74AHCT245QPWRQ1 is sourced from the original manufacturer or authorized distributors?
All SN74AHCT245QPWRQ1 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 SN74AHCT245QPWRQ1 meets industry standards.
7.What is the process for return or replacement of SN74AHCT245QPWRQ1?
All SN74AHCT245QPWRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT245QPWRQ1, 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 SN74AHCT245QPWRQ1 part is unused and in its original packaging.
Return procedure for SN74AHCT245QPWRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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