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Texas Instruments SN74AHC245QPWRG4
- Part No.:
- SN74AHC245QPWRG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHC245QPWRG4.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,787
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Product details
Overview
SN74AHC245QPWRG4 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 ±8 mA output drive at 5 V, achieves propagation delays as low as 4 ns (VCC = 5 V, CL = 15 pF), and features direction-control (DIR) and output-enable (OE) inputs for flexible bus isolation in automotive infotainment backplanes.
For engineers reviewing the SN74AHC245QPWRG4 datasheet, SN74AHC245QPWRG4 pinout, SN74AHC245QPWRG4 application, or SN74AHC245QPWRG4 equivalent, key selection criteria include its AEC-Q100 qualification, 3-state output timing (tPZH/tPLZ ≤ 9.2 ns at 5 V), latch-up immunity (>250 mA per JESD 17), and TSSOP-20 package compatibility with high-density PCB layouts.
Technical Context
This device implements dual-directional 8-bit 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-enabling true bus isolation without external logic. Its CMOS AHC logic family ensures rail-to-rail voltage translation across the full 2–5.5 V supply range.
Input thresholds scale with VCC (VIH = 0.7×VCC min, VIL = 0.3×VCC max), and output drive strength is specified at ±4 mA (3.3 V) and ±8 mA (5 V), supporting TTL- and CMOS-compatible loads. All unused inputs must be tied to VCC or GND to prevent floating-node instability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - enables interoperability across mixed-voltage domains (e.g., 3.3 V MCU ↔ 5 V peripheral) |
| Output Drive | ±8 mA at 5 V - sufficient to drive 50-pF loads with <8.5 ns propagation delay (tPLH/tPHL) |
| Propagation Delay | 4 ns (min) / 6.5 ns (max) at 5 V, 15 pF - supports >100 MHz bus toggle rates in clean signal environments |
| 3-State Enable/Disable | tPZH/tPLZ = 5.6–9.2 ns at 5 V - ensures fast, glitch-free bus release during mode switching |
| Latch-Up Immunity | >250 mA per JESD 17 - meets automotive robustness requirements for transient overcurrent events |
| Operating Temp | –40°C to +125°C - qualified for under-hood and dashboard electronics per AEC-Q100 Grade 1 |
| Input Leakage | ±1 µA max - minimizes static current draw in battery-sensitive always-on subsystems |
Pinout & Package
TSSOP-20 package (PW), 6.5 mm × 4.4 mm, 1.2 mm max height, 0.65 mm lead pitch, RoHS-compliant NIPDAU finish, MSL Level-1.
| 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 polarity |
| 2–9 (A1–A8) | Bus A I/O terminals | 8-bit bidirectional port connected to microcontroller or memory side of interface |
| 10 (GND) | Ground reference | Primary return path for all I/O and internal logic; requires low-inductance PCB connection |
| 11 (VCC) | Power supply | 2–5.5 V supply for core logic and output drivers; decoupling capacitor required near pin |
| 12–19 (B1–B8) | Bus B I/O terminals | 8-bit bidirectional port connected to peripheral or sensor-side bus segment |
| 20 (OE) | Output enable input | Low = active transceiver; High = all A/B pins in high-Z - enables dynamic bus arbitration |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Qualified | Grade 1 (–40°C to +125°C) - certified for automotive powertrain, body control, and ADAS subsystems |
| Supply Voltage Flexibility | 2 V to 5.5 V operation - eliminates level-shifters when interfacing 3.3 V MCUs with legacy 5 V peripherals |
| Fast 3-State Control | tPHZ/tPLZ ≤ 9.2 ns at 5 V - reduces bus contention window during hot-swap or multi-master arbitration |
| High Noise Immunity | VIH(D) = 3.5 V, VIL(D) = 1.5 V at 5 V - suppresses false triggering from EMI in noisy vehicle environments |
| Low Power Standby | ICC = 4 µA typical at 5.5 V - extends battery life in always-on telematics modules |
Applications
| Automotive Infotainment Backplane | Industrial PLC I/O Expansion |
|---|---|
Use Scenario: Bidirectional data exchange between SoC and legacy audio/video codecs in head-unit designs. IC Role / Device Role / Timing Role: Octal transceiver managing AHB/APB bus bridging with direction-controlled flow and OE-gated isolation. Use Value: Eliminates need for discrete logic gates or dual-supply translators while maintaining <6.5 ns timing margin at 5 V. | Use Scenario: Extending controller bus to remote I/O modules over long PCB traces in factory automation racks. IC Role / Device Role / Timing Role: Signal repeater and bus isolator enabling noise-resistant communication between CPU and fieldbus peripherals. Use Value: ±25 mA continuous output current and >250 mA latch-up rating withstand industrial surge transients. |
| Automotive Body Control Module | Medical Diagnostic Equipment Interface |
Use Scenario: Interfacing 3.3 V microcontroller with 5 V CAN transceivers and LIN regulators in door module ECUs. IC Role / Device Role / Timing Role: Voltage-level agnostic bus translator ensuring reliable command/data handshaking across supply domains. Use Value: VIH/VIL scaling with VCC prevents misreads during brown-out conditions common in 12 V automotive systems. | Use Scenario: Isolating FPGA-configured test pattern generators from analog front-end ADC/DAC boards in portable ultrasound units. IC Role / Device Role / Timing Role: Controlled bus gate preventing signal coupling during FPGA reconfiguration sequences. Use Value: tPZH/tPLZ < 10 ns ensures sub-microsecond isolation windows critical for EMI-sensitive medical signal chains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245APWR | Lower drive (±24 mA), wider VCC range (1.65–5.5 V), higher ICC (10 µA typ) | Better for ultra-low-voltage IoT nodes; less suitable for high-noise automotive environments | Choose when operating below 2 V or requiring lower static power at cost of reduced latch-up margin |
| MC74VHC245DT | Same pinout, but non-automotive grade; no AEC-Q100 certification; 125°C max temp only | Acceptable for commercial industrial use, not qualified for automotive safety-critical functions | Select only for cost-sensitive non-automotive designs where AEC-Q100 compliance is unnecessary |
Compared with SN74AHC245QPWRG4, SN74LVC245APWR offers broader voltage flexibility but weaker latch-up immunity, while MC74VHC245DT matches pinout and timing but lacks automotive qualification-making SN74AHC245QPWRG4 the sole choice for AEC-Q100–mandated vehicle subsystems.
Availability
SN74AHC245QPWRG4 is available at Aetrix Electronics and suitable for automotive infotainment backplanes, industrial PLC I/O expansion, and medical diagnostic equipment interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74AHC245QPWRG4 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 experience in high-reliability timing and interface solutions.
The SN74AHC245Q belongs to TI's AHC logic family-designed specifically for automotive and industrial applications demanding wide supply range, high noise immunity, and AEC-Q100 qualification.
FAQ
What is the maximum operating temperature for SN74AHC245QPWRG4?
The SN74AHC245QPWRG4 is rated for operation from –40°C to +125°C and is AEC-Q100 Grade 1 qualified, making it suitable for under-hood automotive applications and industrial environments with elevated ambient temperatures. This rating is verified per TI's production test flow and applies to the TSSOP-20 (PW) package variant shipped as SN74AHC245QPWRG4.
Does SN74AHC245QPWRG4 support 3.3 V-only operation?
Yes, SN74AHC245QPWRG4 fully supports 3.3 V operation: VIH is 2.1 V min and VIL is 0.9 V max at VCC = 3 V, and output drive is ±4 mA - compatible with standard 3.3 V LVTTL and LVCMOS logic families. Its 2–5.5 V supply range allows seamless integration into mixed-voltage systems without level shifters.
How should OE be handled during power-up to ensure high-impedance state?
To guarantee high-impedance outputs during power-up or power-down, OE must be held high (inactive) via a pullup resistor to VCC. TI specifies the minimum resistor value based on the driver's current-sinking capability - typically ≥10 kΩ for most applications - to prevent unintended bus contention before system initialization completes.
Is SN74AHC245QPWRG4 pin-compatible with SN74AHC245QPWR?
Yes, SN74AHC245QPWRG4 is identical in pinout, package (TSSOP-20), and electrical specifications to SN74AHC245QPWR - the "G4" suffix denotes green/RoHS-compliant packaging and tape-and-reel formatting per TI's standard ordering convention, with no functional or mechanical differences affecting PCB layout or schematic design.
What is the latch-up performance specification for SN74AHC245QPWRG4?
SN74AHC245QPWRG4 exceeds 250 mA latch-up immunity per JESD 17, verified through standardized stress testing. This specification ensures robustness against transient current surges in automotive and industrial settings, directly supporting reliability requirements for AEC-Q100 Grade 1 qualification and long-term field operation.
SN74AHC245QPWRG4 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:
- Discontinued at Digi-Key
- 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
SN74AHC245QPWRG4 FAQ
1.How can I place an order for SN74AHC245QPWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC245QPWRG4 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 SN74AHC245QPWRG4 reliable?
The price and inventory of SN74AHC245QPWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC245QPWRG4 is usually 5 days.
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SN74AHC245QPWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC245QPWRG4 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 SN74AHC245QPWRG4?
For technical support, including SN74AHC245QPWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC245QPWRG4 requirements.
6.How does Aetrix verify that SN74AHC245QPWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74AHC245QPWRG4 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 SN74AHC245QPWRG4 meets industry standards.
7.What is the process for return or replacement of SN74AHC245QPWRG4?
All SN74AHC245QPWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC245QPWRG4, 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 SN74AHC245QPWRG4 part is unused and in its original packaging.
Return procedure for SN74AHC245QPWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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