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Texas Instruments SN74HCT245PWG4
- Part No.:
- SN74HCT245PWG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74HCT245PWG4.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,759
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Product details
Overview
SN74HCT245PWG4 from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between A and B buses in 5-V logic systems. It features ±6-mA output drive at 5 V, 14-ns typical propagation delay (CL = 50 pF), 80-µA maximum ICC, and TTL-compatible inputs - enabling robust signal integrity in ribbon-cable and backplane interconnects.
For engineers reviewing the SN74HCT245PWG4 datasheet, SN74HCT245PWG4 pinout, SN74HCT245PWG4 application, or SN74HCT245PWG4 equivalent, key selection criteria include direction-control logic level compatibility, 3-state isolation timing (ten/tdis ≤ 52 ns), 5-V supply tolerance (4.5–5.5 V), and TSSOP-20 thermal performance (RθJA = 94.9°C/W).
Technical Context
The SN74HCT245PWG4 implements a standard '245 logic function with active-low output enable (OE) and unidirectional direction control (DIR). Its dual-bus architecture supports A→B or B→A data flow based on DIR state, while OE independently places all I/Os in high-impedance mode for bus isolation.
It uses HCMOS technology with TTL-voltage-compatible inputs (VIH = 2 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V), balanced ±6-mA output drive, and low input current (±100 nA max), ensuring compatibility with legacy LSTTL loads and minimizing static power draw.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - accommodates 5-V rail tolerance without level-shifting circuitry |
| Propagation Delay | 14 ns typical (CL = 50 pF, VCC = 5.5 V) - enables reliable operation up to ~35 MHz data rates |
| Output Drive | ±6 mA at 5 V - drives up to 15 LSTTL loads directly, eliminating need for external buffers |
| Static Supply Current | 80 µA maximum - supports low-power system standby modes without compromising drive strength |
| Input Compatibility | TTL-voltage compatible (VIH ≥ 2 V, VIL ≤ 0.8 V) - interfaces seamlessly with legacy 5-V microcontrollers and FPGAs |
| 3-State Enable Timing | ten = 52 ns max, tdis = 45 ns max (VCC = 5.5 V) - ensures clean bus arbitration during direction or enable transitions |
Pinout & Package
TSSOP-20 package (PW), body size 6.50 mm × 4.40 mm, with exposed pad not electrically connected; optimized for high-density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction control input | High = A-to-B data flow; Low = B-to-A - determines real-time bus communication path |
| 2–9 (A1–A8) | Port A bidirectional I/O | Connects to local bus (e.g., MCU side); functions as input or output depending on DIR state |
| 10 (GND) | Ground reference | Common return path for all signals and power; critical for noise suppression in high-speed switching |
| 11–18 (B8–B1) | Port B bidirectional I/O | Connects to remote bus (e.g., peripheral or ribbon cable end); complements A-port under DIR control |
| 19 (OE) | Active-low output enable | High = all A/B ports in high-Z; Low = transceiver active - enables bus sharing and hot-swap isolation |
| 20 (VCC) | Power supply | 5-V nominal supply; requires local 0.1-µF bypass capacitor per TI layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional bus isolation | Independent DIR and OE controls allow dynamic reconfiguration of data flow and complete bus disconnection |
| High-current 3-state outputs | ±6-mA drive capability eliminates need for external line drivers in medium-length ribbon-cable applications |
| Low static power consumption | 80-µA max ICC enables use in power-sensitive industrial control modules without thermal derating |
| TTL-compatible input thresholds | VIH = 2 V min / VIL = 0.8 V max ensures interoperability with legacy 5-V logic families without level translators |
| Controlled switching characteristics | Specified ten/tdis (≤52/45 ns) and tpd (≤25 ns) support deterministic timing analysis in synchronous bus designs |
Applications
| Factory Automation Interface | Multi-Function Printer Data Path |
|---|---|
Use Scenario: Isolating PLC master CPU from distributed I/O modules over 30-cm ribbon cables with signal degradation. IC Role / Device Role / Timing Role: Bidirectional buffer amplifying weak MCU outputs and regenerating returns; DIR selects master→slave or slave→master flow. Use Value: Enables reliable 10-MHz data transfer across lossy cables where direct FPGA-to-peripheral connection fails due to edge ringing and amplitude loss. | Use Scenario: Interfacing print engine controller (A bus) with paper-handling subsystem (B bus) requiring independent read/write cycles. IC Role / Device Role / Timing Role: Octal transceiver managing parallel data and status lines; OE synchronizes with strobe signals to prevent bus contention during page buffer swaps. Use Value: Eliminates need for discrete buffers and direction logic, reducing BOM count by 7 components per interface while maintaining <100-ns timing margin. |
| Telecom Infrastructure Backplane | Motor Drive Control Bus |
Use Scenario: Connecting baseband processor to RF module across 15-cm backplane traces with impedance mismatch and crosstalk. IC Role / Device Role / Timing Role: Signal repeater restoring rise/fall times degraded by trace capacitance; DIR set statically for fixed A→B data flow. Use Value: Improves eye diagram opening by >40% at 5-MHz clock rate, meeting telecom BER requirements without redesigning layer stackup. | Use Scenario: Linking motion controller (A bus) to multi-axis driver ICs (B bus) with real-time position feedback loops. IC Role / Device Role / Timing Role: Direction-controlled data conduit for PWM command updates and encoder response reads; OE used for safe shutdown during fault conditions. Use Value: Provides galvanically isolated timing control (via 3-state disable) that prevents runaway motor behavior during emergency stop sequences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT245PWR | Same silicon, TSSOP-20 package, RoHS-compliant NiPdAu finish, MSL Level-1 | Identical functional and timing specs; differs only in packaging and marking (HT245 vs PWG4) | Select SN74HCT245PWR for new designs requiring full RoHS compliance and standard tape-and-reel logistics |
| 74ACT245SCX | Higher speed (tpd = 9 ns typ), 4.5–5.5 V supply, but 24-mA output drive and higher ICC (2 µA typ) | Better suited for high-frequency backplanes (>25 MHz), less ideal for low-power or thermally constrained modules | Choose 74ACT245SCX only when propagation delay is critical and board-level power budget allows 25× higher static current |
Compared with SN74HCT245PWG4, SN74HCT245PWR offers identical electrical behavior with updated packaging compliance, while 74ACT245SCX trades lower power and tighter voltage tolerance for significantly faster switching - making SN74HCT245PWG4 optimal for cost-sensitive, thermally constrained 5-V industrial interfaces.
Availability
SN74HCT245PWG4 is available at Aetrix Electronics and suitable for factory automation interfaces, multi-function printer data paths, and telecom infrastructure backplanes requiring stable component supply and long-term industrial lifecycle support.
Supply support for SN74HCT245PWG4 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 logic solutions for industrial, automotive, and communications markets.
The SN74HCT245 family was engineered for robust 5-V bus interfacing in noise-prone industrial environments, emphasizing TTL compatibility, controlled 3-state timing, and thermal resilience in compact surface-mount packages.
FAQ
What is the operating voltage range for SN74HCT245PWG4?
The SN74HCT245PWG4 operates from 4.5 V to 5.5 V. This range accommodates typical 5-V supply tolerances in industrial systems and ensures reliable TTL-compatible input recognition (VIH ≥ 2 V, VIL ≤ 0.8 V) across the full temperature range (–40°C to +85°C). The SN74HCT245PWG4 does not support 3.3-V operation.
How does the direction control (DIR) pin function in SN74HCT245PWG4?
In SN74HCT245PWG4, the DIR pin is a logic-level input that determines data flow direction: DIR = High enables A-to-B transmission, while DIR = Low enables B-to-A transmission. This control operates independently of OE, allowing dynamic reversal of bus traffic without disabling the device - a key requirement in half-duplex industrial protocols.
What is the maximum output current per pin for SN74HCT245PWG4?
The SN74HCT245PWG4 supports ±35 mA maximum continuous output current per pin and ±70 mA total for all outputs combined. Its rated ±6 mA output drive at 5 V is specified under switching conditions and is sufficient to drive 15 LSTTL loads, making it suitable for medium-drive interconnect applications without external buffering.
Can SN74HCT245PWG4 be used with 3.3-V logic systems?
No, SN74HCT245PWG4 is not compatible with 3.3-V logic systems. Its input thresholds (VIH = 2 V min, VIL = 0.8 V max) and required 4.5–5.5 V supply are designed exclusively for 5-V TTL/CMOS environments. Direct connection to 3.3-V devices risks undriven inputs or excessive current leakage; level-shifting circuitry is required for mixed-voltage interfaces.
What is the thermal resistance (RθJA) of SN74HCT245PWG4 in its TSSOP-20 package?
The SN74HCT245PWG4 in TSSOP-20 (PW) package has a junction-to-ambient thermal resistance (RθJA) of 94.9°C/W. This value assumes standard JEDEC 2-layer board conditions; actual thermal performance improves with PCB copper area and thermal vias. The SN74HCT245PWG4's 80-µA max ICC minimizes self-heating, supporting operation in enclosed industrial enclosures up to +85°C ambient.
SN74HCT245PWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74HCT245PWG4 FAQ
1.How can I place an order for SN74HCT245PWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCT245PWG4 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 SN74HCT245PWG4 reliable?
The price and inventory of SN74HCT245PWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCT245PWG4 is usually 5 days.
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4.How is shipping managed for SN74HCT245PWG4?
SN74HCT245PWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCT245PWG4 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 SN74HCT245PWG4?
For technical support, including SN74HCT245PWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCT245PWG4 requirements.
6.How does Aetrix verify that SN74HCT245PWG4 is sourced from the original manufacturer or authorized distributors?
All SN74HCT245PWG4 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 SN74HCT245PWG4 meets industry standards.
7.What is the process for return or replacement of SN74HCT245PWG4?
All SN74HCT245PWG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCT245PWG4, 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 SN74HCT245PWG4 part is unused and in its original packaging.
Return procedure for SN74HCT245PWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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