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Texas Instruments SN74AHCT245PWRG3
- Part No.:
- SN74AHCT245PWRG3
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHCT245PWRG3.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:900
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Product details
Overview
SN74AHCT245PWRG3 from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between 5 V buses. It operates from 4.5 V to 5.5 V, supports TTL-compatible inputs (VIH = 2 V, VIL = 0.8 V), delivers ±8 mA output drive, and features direction control (DIR) and output enable (OE) logic for isolated bus communication in industrial control backplanes.
For engineers reviewing the SN74AHCT245PWRG3 datasheet, SN74AHCT245PWRG3 pinout, SN74AHCT245PWRG3 application, or SN74AHCT245PWRG3 equivalent, this page provides verified electrical specs, TSSOP-20 pin mapping, real-world use cases including level translation and bus isolation, and two validated alternative parts with documented functional and thermal differences.
Technical Context
The SN74AHCT245PWRG3 implements dual 8-bit bidirectional I/O paths controlled by DIR and OE signals, enabling A→B or B→A data flow under active-low OE. Its CMOS design with TTL-input thresholds allows direct interfacing with legacy 3.3 V logic while driving 5 V buses, and its slow edge rates minimize output ringing on unterminated lines.
It features 3-state outputs with high-impedance disable, latch-up immunity exceeding 250 mA per JESD17, and ESD protection of ±2000 V HBM. The device is rated for operation from –40°C to 125°C and supports 15 pF and 50 pF load switching with tPLH/tPHL ≤ 10 ns at 5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5 V logic rails and tolerance to supply ripple. |
| Input Thresholds | VIH = 2 V, VIL = 0.8 V - enables direct connection to 3.3 V CMOS/TTL outputs without level shifters. |
| Output Drive | ±8 mA at VOH/VOL - sufficient to drive multiple 5 V TTL loads while maintaining noise margin. |
| Propagation Delay | tPLH/tPHL ≤ 10 ns (CL = 15 pF) - supports 50+ MHz bus handshaking in synchronous systems. |
| Operating Temperature | –40°C to 125°C - qualified for extended industrial and automotive under-hood environments. |
| ESD Rating | ±2000 V HBM - meets IEC 61000-4-2 system-level robustness requirements for board assembly. |
| Power Dissipation | Cpd = 13 pF - low dynamic power consumption suitable for high-density PCB layouts. |
Pinout & Package
TSSOP-20 package (PW), 6.50 mm × 4.40 mm body, 0.65 mm lead pitch, RoHS-compliant matte tin (SN) 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 directionality. |
| 2–9 (A1–A8) | Port A bidirectional I/O | Connects to source bus; transitions between input and output based on DIR and OE state. |
| 10 (GND) | Ground reference | Primary return path for all I/O and supply currents; must be low-impedance for signal integrity. |
| 11–18 (B1–B8) | Port B bidirectional I/O | Connects to destination bus; mirrors A-port behavior with opposite direction logic. |
| 19 (OE) | Output enable input | Active-low - drives all A/B outputs to high-impedance when high, isolating both buses. |
| 20 (VCC) | Positive supply | 5 V nominal power rail; requires local 0.1 µF bypass capacitor adjacent to pin for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-voltage compatible inputs | Accepts 0.8 V/2 V thresholds - eliminates need for external level-shifting circuitry when interfacing 3.3 V controllers. |
| Asynchronous bidirectional control | DIR and OE operate independently - enables dynamic bus reversal without clock synchronization or reset sequencing. |
| Slow edge rate optimization | Controlled slew minimizes overshoot/undershoot - reduces EMI and eliminates termination resistors on short PCB traces. |
| High-impedance isolation | Outputs enter Hi-Z within 16 ns of OE assertion - prevents bus contention during controller reset or hot-swap events. |
| Latch-up immunity | Exceeds 250 mA per JESD17 - ensures survivability during transient overcurrent events in industrial power domains. |
Applications
| Industrial Backplane Interface | Microcontroller Bus Expansion |
|---|---|
Use Scenario: Isolating a PLC main CPU bus from modular I/O expansion slots during firmware updates. IC Role / Device Role / Timing Role: Bidirectional data bridge with direction and enable control, decoupling timing domains between master and slave modules. Use Value: Prevents bus contention during hot-plug insertion and enables independent power cycling of peripheral modules without CPU reset. |
Use Scenario: Extending GPIO count of an ARM Cortex-M4 MCU to drive 16-bit parallel LCD and SD card interface simultaneously. IC Role / Device Role / Timing Role: Level-translating bus transceiver managing data flow between 3.3 V MCU and 5 V display/SD logic. Use Value: Eliminates discrete level shifters and reduces BOM count while maintaining <10 ns propagation delay for pixel clock alignment. |
| Legacy System Upgrade | Test Equipment Signal Routing |
Use Scenario: Interfacing modern FPGA-based test controllers with aging 5 V TTL instrumentation via ribbon-cable backplanes. IC Role / Device Role / Timing Role: Direction-controlled buffer providing impedance matching and noise filtering on long parallel traces. Use Value: Compensates for signal degradation over 30 cm cables using slow-edge drive, reducing false triggers in automated test sequences. |
Use Scenario: Configurable signal path selection in modular benchtop DMMs where analog/digital buses share physical connectors. IC Role / Device Role / Timing Role: Electrically isolated bus switch enabling reconfigurable measurement front-end routing under microcontroller command. Use Value: Enables single-hardware platform to support 4 distinct measurement modes (voltage/current/resistance/capacitance) without manual jumpering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHCT245PWR | Same silicon, NIPDAU lead finish instead of matte tin (SN); identical electrical specs and TSSOP-20 footprint. | No functional difference; SN finish offers superior solderability for lead-free reflow profiles with tighter thermal budgets. | Select SN74AHCT245PWRG3 when manufacturing uses peak reflow > 245°C or requires enhanced wetting on OSP-finished PCBs. |
| SN74LVC245APWR | Lower VCC range (1.65–3.6 V), higher speed (tPD ≈ 5.3 ns), but not 5 V tolerant - requires external level shifting for 5 V buses. | Only suitable for 3.3 V-only systems; cannot replace SN74AHCT245PWRG3 in mixed-voltage or legacy 5 V designs. | Choose SN74LVC245APWR only when full system operates at ≤3.3 V and sub-5 ns timing is critical; not a drop-in replacement. |
Compared with SN74AHCT245PWR and SN74LVC245APWR, the SN74AHCT245PWRG3 uniquely combines 5 V bus compatibility, TTL input thresholds, and matte tin finish - making it the sole option for robust 5 V industrial backplane upgrades requiring lead-free process compliance without redesign.
Availability
SN74AHCT245PWRG3 is available at Aetrix Electronics and suitable for industrial backplane interfaces, microcontroller bus expansion, and legacy system upgrades requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74AHCT245PWRG3 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 connectivity technologies, with decades of experience in industrial-grade logic and interface solutions.
The SN74AHCT245PWRG3 belongs to TI's AHCT logic family, engineered specifically for robust 5 V bus interfacing in harsh environments - emphasizing noise immunity, wide temperature operation, and seamless integration with legacy TTL and modern CMOS systems.
FAQ
What is the maximum operating temperature for SN74AHCT245PWRG3?
The SN74AHCT245PWRG3 is rated for continuous operation from –40°C to +125°C ambient temperature. This extended range is validated per TI's production testing and supports deployment in industrial control cabinets, automotive engine compartments, and outdoor telecom equipment where thermal stress exceeds commercial-grade limits. The SN74AHCT245PWRG3 maintains full electrical compliance across this entire span without derating.
Does SN74AHCT245PWRG3 support 3.3 V logic inputs directly?
Yes, the SN74AHCT245PWRG3 accepts 3.3 V logic inputs directly due to its TTL-compatible input thresholds: VIH = 2.0 V (min) and VIL = 0.8 V (max). When driven by a 3.3 V microcontroller, the SN74AHCT245PWRG3 reliably recognizes high and low states without external biasing or level-shifting circuitry - enabling clean voltage translation from 3.3 V to 5 V bus domains.
What is the purpose of the DIR pin on SN74AHCT245PWRG3?
The DIR (direction) pin on SN74AHCT245PWRG3 controls real-time data flow direction between Port A and Port B. When DIR = Low, data passes from Port B to Port A; when DIR = High, data flows from Port A to Port B. This asynchronous, level-sensitive control allows dynamic bus reversal without clocks or handshaking - essential for flexible memory-mapped I/O and configurable peripheral interconnects in the SN74AHCT245PWRG3.
Can SN74AHCT245PWRG3 be used without pull-up resistors on OE and DIR?
While the SN74AHCT245PWRG3 will function with OE and DIR driven actively by logic outputs, TI recommends pull-up resistors on OE during power-up to ensure outputs remain in high-impedance state until firmware initializes control lines. For DIR, a pull-up or pull-down resistor sets default direction if uncontrolled - preventing undefined bus states. The SN74AHCT245PWRG3 has no internal weak pull-ups; external biasing is required for fail-safe startup behavior.
How does the SN74AHCT245PWRG3 differ from SN74AHCT245PWR?
The SN74AHCT245PWRG3 and SN74AHCT245PWR share identical die, pinout, and electrical specifications. The sole difference is lead finish: SN74AHCT245PWRG3 uses matte tin (SN), optimized for lead-free reflow with superior solder joint reliability above 245°C, while SN74AHCT245PWR uses nickel-palladium-gold (NIPDAU). Both are TSSOP-20 and fully interchangeable electrically - the SN74AHCT245PWRG3 is selected for high-thermal-budget assembly processes.
SN74AHCT245PWRG3 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:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 8mA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74AHCT245PWRG3 FAQ
1.How can I place an order for SN74AHCT245PWRG3 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT245PWRG3 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 SN74AHCT245PWRG3 reliable?
The price and inventory of SN74AHCT245PWRG3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT245PWRG3 is usually 5 days.
3.What payment methods are accepted for SN74AHCT245PWRG3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHCT245PWRG3 transactions.
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4.How is shipping managed for SN74AHCT245PWRG3?
SN74AHCT245PWRG3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT245PWRG3 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 SN74AHCT245PWRG3?
For technical support, including SN74AHCT245PWRG3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT245PWRG3 requirements.
6.How does Aetrix verify that SN74AHCT245PWRG3 is sourced from the original manufacturer or authorized distributors?
All SN74AHCT245PWRG3 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 SN74AHCT245PWRG3 meets industry standards.
7.What is the process for return or replacement of SN74AHCT245PWRG3?
All SN74AHCT245PWRG3 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT245PWRG3, 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 SN74AHCT245PWRG3 part is unused and in its original packaging.
Return procedure for SN74AHCT245PWRG3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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