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Texas Instruments SN74HCT245DGSR
- Part No.:
- SN74HCT245DGSR
- Manufacturer:
- Texas Instruments
- Package:
- 20-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
SN74HCT245DGSR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,980
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Product details
Overview
SN74HCT245DGSR 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), and operates across –40°C to 125°C. Used in ribbon-cable signal integrity enhancement and backplane buffering.
For engineers reviewing the SN74HCT245DGSR datasheet, SN74HCT245DGSR pinout, SN74HCT245DGSR application, or SN74HCT245DGSR equivalent, key selection criteria include direction-control logic level compatibility, 3-state isolation timing (ten/tdis ≤ 52 ns), thermal resistance (RθJA = 118.4°C/W in DGS package), and TTL-voltage-compatible inputs for legacy system interfacing.
Technical Context
The SN74HCT245DGSR implements a standard '245 logic function with active-low output enable (OE) and unidirectional direction control (DIR). Its CMOS HCT process ensures TTL-level input thresholds (VIH = 2 V, VIL = 0.8 V) while delivering rail-to-rail 5-V output swing and balanced ±6-mA drive capability on all eight channels.
Functional modes are defined by OE and DIR: OE low enables bidirectional flow (DIR high → A→B; DIR low → B→A); OE high places all A/B I/Os in high-impedance state. Propagation delay is symmetric (tpd ≤ 25 ns at 5.5 V, CL = 50 pF), and switching characteristics are specified for both 50-pF and 150-pF loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - supports standard 5-V rail with ±10% tolerance; no external regulation required. |
| Propagation Delay (tpd) | 14 ns typical (5 V, CL = 50 pF) - enables reliable 35-MHz bus operation in synchronous systems. |
| Output Drive | ±6 mA at 5 V - drives up to 15 LSTTL loads directly without external buffers. |
| Static Supply Current (ICC) | 80 µA maximum - ultra-low quiescent power for always-on bus isolation stages. |
| Input Compatibility | TTL-voltage compatible (VIH = 2 V, VIL = 0.8 V) - interfaces seamlessly with legacy 74LS/74ALS logic. |
| Operating Temperature | –40°C to +125°C - qualified for extended industrial and automotive under-hood environments. |
| ESD Rating | ±2000 V CDM - meets JEDEC JESD22-C101 for robust handling in automated assembly. |
Pinout & Package
VSSOP-20 (DGS) package: 5.10 mm × 3.00 mm, 0.5-mm pitch, thermally enhanced with exposed pad (not electrically connected). Pin 1 marked via dot; pin 10 = GND, pin 20 = VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction control input | High = A→B data flow; Low = B→A; determines signal path polarity during active state. |
| 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 | Primary return path for all signals and supply current; must be low-inductance connection. |
| 11–18 (B8–B1) | Port B bidirectional I/O | Connects to remote bus (e.g., peripheral side); complements A-port for full-duplex channel pairing. |
| 19 (OE) | Output enable (active low) | High = all A/B pins in high-Z; critical for bus arbitration and hot-swap isolation. |
| 20 (VCC) | Power supply | 5-V supply input; requires local 0.1-µF bypass capacitor placed within 2 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional bus isolation | Enables two-way communication between mismatched or electrically separated buses using single DIR control line. |
| Low-noise VCC/GND pin placement | Center-aligned power/ground pins minimize simultaneous switching noise in high-speed multi-bit transfers. |
| High-current 3-state outputs | ±6-mA drive strength eliminates need for external line drivers in ribbon-cable and backplane applications. |
| CMOS HCT process | Combines TTL input compatibility with CMOS power efficiency-supports mixed-logic system integration. |
| Thermally optimized DGS package | VSSOP-20 provides 118.4°C/W junction-to-ambient resistance-enables higher sustained throughput in compact layouts. |
Applications
| Factory Automation Bus Interface | Multi-Function Printer Data Path |
|---|---|
|
Use Scenario: Isolating PLC controller bus from distributed I/O modules over 1-meter ribbon cable runs. IC Role / Device Role / Timing Role: Bidirectional buffer amplifying weak MCU outputs and regenerating signals for noise immunity. Use Value: Enables 10-MHz data transfer across lossy cables with <10% signal degradation-verified in TI Figure 9-2 simulation. |
Use Scenario: Interfacing main controller ASIC to scanner engine, paper feed, and print head subsystems. IC Role / Device Role / Timing Role: Direction-controlled data shuttle synchronizing command/response traffic between independent timing domains. Use Value: Eliminates bus contention via OE-gated 3-state control-ensures deterministic handshaking in real-time print workflows. |
| Telecom Infrastructure Backplane | Motor Drive Control Interface |
|
Use Scenario: Bridging FPGA-based packet processor to legacy PHY modules on shared backplane. IC Role / Device Role / Timing Role: Level-shifting and drive-strengthening transceiver maintaining signal integrity at 25-MHz clock rates. Use Value: Reduces bit error rate by >90% vs. direct FPGA-to-PHY connection-validated in TI typical application section. |
Use Scenario: Connecting microcontroller PWM outputs to isolated gate-driver inputs in servo amplifier boards. IC Role / Device Role / Timing Role: Direction-selectable interface translating logic-level commands into robust gate-drive enable signals. Use Value: Prevents shoot-through risk via synchronized OE assertion during direction transitions-critical for IGBT safety. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT245DBR | VSSOP-20 replaced with SSOP-20 (7.80 mm × 7.20 mm); RθJA = 84.6°C/W; same electrical specs. | Higher board space requirement; lower thermal resistance allows higher ambient temperature margin. | Select SN74HCT245DBR when layout area permits and thermal derating above 85°C is needed. |
| SN74LVC245A | 3.3-V only (1.65–3.6 V); ±24-mA drive; 3.5-ns tpd; different VIH/VIL thresholds (≥2 V / ≤0.8 V). | Not pin-compatible; requires level translation for 5-V systems; superior speed/power for modern low-voltage designs. | Choose SN74LVC245A only in new 3.3-V designs where higher speed and lower voltage operation are primary goals. |
Compared with SN74HCT245DBR and SN74LVC245A, the SN74HCT245DGSR offers the smallest footprint (5.10 × 3.00 mm) and highest temperature rating (–40°C to +125°C), making it optimal for space-constrained industrial controllers requiring extended thermal margin without voltage translation.
Availability
SN74HCT245DGSR is available at Aetrix Electronics and suitable for factory automation bus interfaces, telecom backplanes, and motor drive control systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74HCT245DGSR 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 over 50 years of innovation in industrial-grade IC design.
The SN74HCT245DGSR belongs to TI's industry-standard 74HCT logic family, engineered for robust 5-V TTL-compatible interfacing in harsh environments including factory floors and telecom infrastructure.
FAQ
What is the maximum operating temperature for the SN74HCT245DGSR?
The SN74HCT245DGSR is rated for operation from –40°C to +125°C, as confirmed in Section 6.3 Recommended Operating Conditions of the TI datasheet SCLS020H. This extended range supports deployment in automotive under-hood modules and industrial control cabinets without forced cooling.
Does the SN74HCT245DGSR require external pull-up resistors on DIR or OE pins?
No. The SN74HCT245DGSR has CMOS inputs with leakage current ≤ ±100 nA (Section 6.5), so DIR and OE can be driven directly from MCU GPIOs or logic gates without pull-ups. However, unused inputs must be tied to VCC or GND per TI application report SCBA004 to prevent floating states.
Can the SN74HCT245DGSR drive a 150-pF load reliably?
Yes. The SN74HCT245DGSR specifies switching characteristics for CL = 150 pF in Section 6.7, with tpd ≤ 34 ns (5.5 V) and ten ≤ 67 ns. These values ensure timing compliance in high-capacitance PCB traces or multi-drop bus configurations common in backplane designs.
Is the SN74HCT245DGSR RoHS-compliant and lead-free?
Yes. Per TI's PACKAGE OPTION ADDENDUM, SN74HCT245DGSR carries "Yes" in the RoHS column and uses NIPDAU (Nickel/Palladium/Gold) lead finish, meeting JEDEC J-STD-020 moisture sensitivity level 1 (260°C peak reflow).
How does the SN74HCT245DGSR differ from the SN74HCT245N in terms of thermal performance?
The SN74HCT245DGSR (VSSOP-20) has RθJA = 118.4°C/W, while the SN74HCT245N (PDIP-20) has RθJA = 43.4°C/W. Though the DGS package is smaller, its higher thermal resistance means it requires careful PCB copper pour design; the PDIP version dissipates heat more readily in free-air but occupies significantly more board area.
SN74HCT245DGSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 20-TFSOP (0.118", 3.00mm 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:
- 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-VSSOP
SN74HCT245DGSR FAQ
1.How can I place an order for SN74HCT245DGSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCT245DGSR 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 SN74HCT245DGSR reliable?
The price and inventory of SN74HCT245DGSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCT245DGSR is usually 5 days.
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SN74HCT245DGSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCT245DGSR 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 SN74HCT245DGSR?
For technical support, including SN74HCT245DGSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCT245DGSR requirements.
6.How does Aetrix verify that SN74HCT245DGSR is sourced from the original manufacturer or authorized distributors?
All SN74HCT245DGSR 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 SN74HCT245DGSR meets industry standards.
7.What is the process for return or replacement of SN74HCT245DGSR?
All SN74HCT245DGSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCT245DGSR, 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 SN74HCT245DGSR part is unused and in its original packaging.
Return procedure for SN74HCT245DGSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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