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Texas Instruments SN74HCT245DW
- Part No.:
- SN74HCT245DW
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74HCT245DW.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,786
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Product details
Overview
SN74HCT245DW from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between two 8-bit buses in 5-V logic systems. It features direction control (DIR), active-low output enable (OE), ±6-mA drive at 5 V, 14-ns typical propagation delay, and TTL-compatible inputs - enabling robust signal integrity in industrial backplane and ribbon-cable interconnects.
For engineers reviewing the SN74HCT245DW datasheet, SN74HCT245DW pinout, SN74HCT245DW application, or SN74HCT245DW equivalent, this page delivers verified electrical specs, SOIC-20 package details, functional mode behavior, real-world isolation and drive-strengthening use cases, and two validated alternative parts for design continuity.
Technical Context
The SN74HCT245DW implements a standard '245 logic function with positive-logic direction control and active-low 3-state enable. Its dual-bus architecture supports A→B or B→A data flow depending on DIR state, while OE independently places all outputs in high-impedance mode to isolate buses.
It operates strictly within 4.5 V–5.5 V supply range, exhibits balanced tpd (14 ns typ. at 5.5 V, CL = 50 pF), and maintains low static ICC (≤80 µA) with input current ≤1 µA - making it suitable for noise-sensitive, power-constrained 5-V digital systems requiring deterministic timing and bus contention avoidance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with nominal 5-V rails despite ±5% tolerance; avoids undervoltage lockout or overvoltage stress. |
| Propagation Delay (tpd) | 14 ns typical at 5.5 V, CL = 50 pF - enables reliable operation up to ~35 MHz clock-equivalent data rates in point-to-point links. |
| Output Drive | ±6 mA at 5 V - sufficient to directly drive 15 LSTTL loads or overcome ribbon-cable attenuation without external buffering. |
| Input Compatibility | TTL-voltage compatible (VIH = 2 V min, VIL = 0.8 V max) - interfaces seamlessly with legacy 5-V TTL, CMOS, and microcontroller GPIOs. |
| Static Supply Current | 80 µA maximum - minimizes quiescent power in always-on industrial control modules and factory automation nodes. |
| ESD Rating | ±1500 V HBM - meets standard handling requirements for board assembly in non-classified environments. |
Pinout & Package
SN74HCT245DW uses a 20-pin SOIC (DW) package with 12.80 mm × 7.50 mm body size, surface-mount footprint, and standard JEDEC MS-013 outline. Pin 1 is located at the top-left corner adjacent to the index mark.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction control input | High = A→B data flow; Low = B→A; determines signal path polarity for all 8 channels simultaneously. |
| 2–9 (A1–A8) | Port A I/O terminals | Bidirectional data lines tied to first bus; function as inputs or outputs depending on DIR and OE states. |
| 10 (GND) | Ground reference | Primary return path for logic and switching currents; must be low-impedance and decoupled locally. |
| 11–18 (B8–B1) | Port B I/O terminals | Bidirectional data lines tied to second bus; mirror A-side behavior under DIR control. |
| 19 (OE) | Active-low output enable | High = all A/B pins in high-Z; Low = transceiver enabled; critical for bus arbitration and hot-swap isolation. |
| 20 (VCC) | Power supply | 5-V supply input; requires local 0.1-µF ceramic bypass capacitor placed adjacent to pin for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional bus isolation | Enables safe, contention-free communication between independent 8-bit data domains using single DIR/OE control. |
| High-current 3-state outputs | ±6-mA drive capability allows direct interface to long traces, ribbon cables, or multiple LSTTL inputs without external drivers. |
| Low static power consumption | 80-µA max ICC supports energy-efficient operation in always-on industrial controllers and embedded gateways. |
| TTL-compatible input thresholds | VIH ≥ 2 V and VIL ≤ 0.8 V ensure reliable recognition of legacy 5-V logic levels across temperature and voltage variation. |
| Controlled switching characteristics | 14-ns typical tpd and matched rise/fall times (tt ≤ 11 ns at 5.5 V) reduce skew and support synchronous multi-channel timing. |
Applications
| Factory Automation Bus Interface | Industrial Backplane Data Link |
|---|---|
Use Scenario: Connecting PLC I/O modules to a central controller via parallel bus over 30-cm ribbon cable. IC Role / Device Role / Timing Role: Bidirectional buffer isolating master and slave buses while amplifying weak MCU signals to maintain edge integrity. Use Value: Prevents signal degradation and timing violations caused by cable capacitance, enabling reliable 10-MHz burst transfers. |
Use Scenario: Interfacing FPGA-based processing card with analog I/O carrier board in modular test equipment. IC Role / Device Role / Timing Role: Level-shifting and drive-strengthening transceiver between mismatched load conditions on backplane segments. Use Value: Eliminates need for discrete buffer arrays, reducing BOM count and PCB area while maintaining <25-ns inter-channel skew. |
| Multi-Function Printer Engine Control | Motor Drive Interface Module |
Use Scenario: Routing command/status data between main CPU and print engine ASIC across flex cable with >100-pF loading. IC Role / Device Role / Timing Role: Direction-controlled data repeater synchronizing bidirectional handshake protocols (e.g., BUSY/ACK). Use Value: Ensures clean signal transitions at distant end, preventing false ACK detection and print job corruption. |
Use Scenario: Isolating microcontroller GPIOs from high-noise motor driver ICs in HVAC blower control units. IC Role / Device Role / Timing Role: Noise-immune bus coupler decoupling logic domain from power-switching domain using OE-gated 3-state. Use Value: Blocks ground bounce and EMI coupling during MOSFET switching, improving system-level EMC compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT245DWR | Same silicon, identical electrical specs; differs only in tape-and-reel packaging (2000 pcs/reel vs. tube for DW). | No functional difference; used interchangeably where automated assembly requires reel format. | Select SN74HCT245DWR for SMT production; SN74HCT245DW remains valid for prototyping or manual soldering. |
| SN74LVC245A | Lower voltage operation (1.65–3.6 V), higher speed (tPD ≈ 4.5 ns), but reduced drive (±24 mA) and no TTL input compatibility. | Suitable for modern low-voltage systems (e.g., 3.3-V FPGAs); not drop-in for legacy 5-V designs requiring VIH = 2 V. | Choose SN74LVC245A only when migrating to 3.3-V logic; retain SN74HCT245DW for 5-V interoperability and backward compatibility. |
Compared with SN74HCT245DWR (identical functionality, packaging-only variant) and SN74LVC245A (3.3-V optimized, incompatible input thresholds), the SN74HCT245DW provides guaranteed 5-V TTL interoperability, proven ribbon-cable drive performance, and legacy system compatibility without layout or firmware changes.
Availability
SN74HCT245DW is available at Aetrix Electronics and suitable for factory automation, industrial backplane, and motor drive applications requiring stable component supply, long-term obsolescence management, and traceable sourcing for mission-critical deployments.
Supply support for SN74HCT245DW 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, with decades of expertise in industrial-grade interface ICs and automotive-qualified components.
The SN74HCT245DW belongs to TI's classic HCT logic family, engineered specifically for robust 5-V mixed-signal systems where TTL compatibility, noise immunity, and bus isolation are essential - such as programmable logic controllers and test instrumentation.
FAQ
What is the operating voltage range for SN74HCT245DW?
The SN74HCT245DW operates from 4.5 V to 5.5 V. This range accommodates standard 5-V supply tolerances and ensures reliable logic-level translation and output drive across temperature and load variations. Operation outside this range may cause undefined behavior or damage, per absolute maximum ratings.
How does the direction control (DIR) pin function on SN74HCT245DW?
The DIR pin on SN74HCT245DW selects data flow direction: logic high enables transmission from port A to port B; logic low enables transmission from port B to port A. DIR has no effect when OE is high, as all outputs remain in high-impedance state regardless of DIR level.
Can SN74HCT245DW drive 15 LSTTL loads directly?
Yes, SN74HCT245DW is specified to drive up to 15 LSTTL loads directly, thanks to its ±6-mA output drive capability at 5 V. This eliminates the need for additional buffer stages in legacy 5-V systems, simplifying board design and reducing signal path latency.
What is the maximum propagation delay for SN74HCT245DW at 5.5 V?
At 5.5 V and CL = 50 pF, the maximum propagation delay (tpd) for SN74HCT245DW is 25 ns over the full operating temperature range (–40°C to +85°C). Typical tpd is 14 ns under same conditions, supporting timing-critical 5-V bus interfaces.
Is SN74HCT245DW pin-compatible with other '245-family devices in SOIC-20 packages?
Yes, SN74HCT245DW shares identical pinout and SOIC-20 footprint with SN74HCT245DWR, SN74HCT245N, and SN74HCT245NSR. However, voltage ranges, drive strength, and input thresholds differ across families (e.g., LVC vs. HCT), so electrical compatibility must be verified per application.
SN74HCT245DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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-SOIC
SN74HCT245DW FAQ
1.How can I place an order for SN74HCT245DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCT245DW 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 SN74HCT245DW reliable?
The price and inventory of SN74HCT245DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCT245DW is usually 5 days.
3.What payment methods are accepted for SN74HCT245DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HCT245DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HCT245DW?
SN74HCT245DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCT245DW 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 SN74HCT245DW?
For technical support, including SN74HCT245DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCT245DW requirements.
6.How does Aetrix verify that SN74HCT245DW is sourced from the original manufacturer or authorized distributors?
All SN74HCT245DW 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 SN74HCT245DW meets industry standards.
7.What is the process for return or replacement of SN74HCT245DW?
All SN74HCT245DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCT245DW, 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 SN74HCT245DW part is unused and in its original packaging.
Return procedure for SN74HCT245DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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