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Texas Instruments SN74HCT245DWRG4
- Part No.:
- SN74HCT245DWRG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74HCT245DWRG4.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,890
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Product details
Overview
SN74HCT245DWRG4 from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between two 8-bit buses. It operates at 4.5–5.5 V, delivers ±6 mA output drive at 5 V, exhibits typical propagation delay of 14 ns (CL = 50 pF), and supports TTL-compatible inputs - enabling robust signal integrity in industrial backplane and ribbon-cable interconnects.
For engineers reviewing the SN74HCT245DWRG4 datasheet, SN74HCT245DWRG4 pinout, SN74HCT245DWRG4 application, or SN74HCT245DWRG4 equivalent, key selection criteria include its 3-state bidirectional control architecture, 20-pin SOIC package, guaranteed operation across –40°C to +85°C, and compatibility with legacy 5-V logic systems requiring high-current bus driving capability.
Technical Context
The SN74HCT245DWRG4 implements a dual-control logic interface: DIR selects data direction (A→B or B→A), while active-low OE enables/disables all outputs simultaneously into high-impedance state. Its CMOS HCT process ensures TTL-voltage compatibility on inputs and rail-to-rail output swing under load.
It features balanced propagation delays (tpd ≤ 25 ns at 5.5 V, CL = 50 pF), low static supply current (ICC ≤ 80 µA), and input clamp protection (±20 mA). The device avoids bus contention via strict functional mode control per Table 8-1, and its center-aligned VCC/GND pins reduce switching noise in high-density PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - accommodates standard 5-V rail tolerances without level-shifting circuitry |
| Propagation Delay (tpd) | 14 ns typical (5.5 V, CL = 50 pF) - enables reliable timing in 30-MHz+ bus systems |
| Output Drive | ±6 mA at 5 V - directly drives up to 15 LSTTL loads without external buffers |
| Input Compatibility | TTL-voltage compatible (VIH ≥ 2 V, VIL ≤ 0.8 V) - interoperates with legacy 5-V logic families |
| Quiescent Current | 80 µA maximum - minimizes standby power in always-on industrial control modules |
| Operating Temperature | –40°C to +85°C - qualified for commercial/industrial ambient environments |
| ESD Rating | ±1500 V HBM - meets standard handling requirements for automated assembly |
Pinout & Package
SN74HCT245DWRG4 is housed in a 20-pin SOIC (DW) package measuring 12.80 mm × 7.50 mm, with standard 1.27-mm pitch and gull-wing leads suitable for reflow soldering. Pin 1 is marked by a beveled corner or dot; pin numbering follows counter-clockwise sequence from top-left when viewed top-down.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction control input | High = A-bus to B-bus; Low = B-bus to A-bus - determines real-time data flow path |
| 2–9 (A1–A8) | Port A I/O terminals | Bidirectional data channels tied to first bus; function as input or output depending on DIR state |
| 10 (GND) | Ground reference | Primary return path for logic and switching currents; must be low-impedance for noise control |
| 11–18 (B1–B8) | Port B I/O terminals | Bidirectional data channels tied to second bus; mirror A-port behavior under DIR control |
| 19 (OE) | Active-low output enable | High = all A/B ports enter high-Z isolation; Low = transceiver active - enables bus sharing |
| 20 (VCC) | Power supply | 5-V nominal supply; requires local 0.1-µF bypass capacitor adjacent to pin for stable operation |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional bus isolation | Enables shared resource access between microcontrollers and peripherals without hardware arbitration logic |
| 3-state output control | Allows multiple transceivers on same bus segment with deterministic enable/disable sequencing |
| Low input current (≤1 µA) | Reduces loading on upstream drivers and simplifies termination design in fan-out-critical applications |
| Clamp diode protection | ±20 mA input/output clamp current rating prevents damage during transient overvoltage events |
| Center VCC/GND pin layout | Minimizes ground bounce and supply noise coupling during simultaneous 8-bit switching |
Applications
| Industrial Backplane Interconnect | Ribbon-Cable Data Extension |
|---|---|
Use Scenario: Connecting PLC CPU modules to distributed I/O racks over rigid backplanes with impedance-mismatched traces. IC Role / Device Role / Timing Role: Bidirectional signal repeater that restores edge integrity and increases drive strength across long parallel traces. Use Value: Enables reliable 8-bit parallel communication at >20 MHz without signal degradation or timing skew accumulation. | Use Scenario: Extending data paths between MCU and remote sensor array using 26-conductor flat cable in factory automation. IC Role / Device Role / Timing Role: High-current buffer isolating master/slave buses while supporting full-duplex handshaking protocols. Use Value: Doubles effective cable length before signal attenuation exceeds TTL thresholds, verified in TI Figure 9-2 simulation. |
| Legacy System Bus Expansion | Multi-Function Printer Engine Control |
Use Scenario: Adding new peripheral cards to aging 5-V ISA-style bus architecture without redesigning motherboard drivers. IC Role / Device Role / Timing Role: Level-translating transceiver maintaining backward compatibility with TTL/LS-TTL source impedances. Use Value: Eliminates need for discrete resistor networks or additional voltage translators in mixed-logic upgrades. | Use Scenario: Isolating print engine controller from paper feed, fuser, and scanner subsystems in shared bus topology. IC Role / Device Role / Timing Role: Fault-containment buffer preventing fault propagation between critical subsystems during jam or thermal shutdown. Use Value: Reduces system-level failure rate by decoupling noisy motor drivers from sensitive analog sensor interfaces. |
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 | Identical electrical specs and pinout; G4 suffix denotes RoHS-compliant NiPdAu lead finish vs. standard NiPdAu in DWR | No functional difference; both rated for –40°C to +85°C and packaged in 20-pin SOIC | Select SN74HCT245DWRG4 when full RoHS compliance documentation and Pb-free traceability are required for final product certification. |
| 74ACT245SCX | Higher speed (tpd ≈ 9 ns), wider VCC range (4.5–5.5 V), but higher ICC (100 µA max) and no guaranteed 5-V TTL compatibility | Better suited for high-speed digital test equipment where timing margin is critical and input voltage margins are controlled | Choose 74ACT245SCX only if propagation delay reduction outweighs increased power and stricter input threshold requirements. |
Compared with SN74HCT245DWR and 74ACT245SCX, the SN74HCT245DWRG4 provides optimal balance of proven 5-V TTL interoperability, industrial temperature range, and RoHS-compliant packaging - making it the preferred choice for cost-sensitive, reliability-critical embedded control designs.
Availability
SN74HCT245DWRG4 is available at Aetrix Electronics and suitable for industrial backplane interconnect, ribbon-cable data extension, and legacy system bus expansion requiring stable component supply across extended production lifecycles.
Supply support for SN74HCT245DWRG4 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 SN74HCT245DWRG4 belongs to TI's industry-standard 74HCT logic family, engineered specifically for robust 5-V system interfacing with TTL-compatible inputs, high-noise immunity, and seamless integration into legacy and new industrial control architectures.
FAQ
What is the operating temperature range for SN74HCT245DWRG4?
The SN74HCT245DWRG4 is specified to operate from –40°C to +85°C, qualifying it for industrial-grade applications including factory automation controllers, motor drives, and telecom infrastructure equipment where ambient temperatures exceed consumer-grade limits. This range is confirmed in Section 6.3 Recommended Operating Conditions of the official TI datasheet SCLS020H.
Does SN74HCT245DWRG4 support bidirectional data flow without external logic?
Yes, SN74HCT245DWRG4 supports true bidirectional data flow using only its DIR pin: logic high enables A→B transmission, logic low enables B→A transmission. No external combinational logic is needed - the internal architecture handles direction routing synchronously with OE control, as defined in Table 8-1 of the TI datasheet.
What is the maximum capacitive load SN74HCT245DWRG4 can drive reliably?
SN74HCT245DWRG4 is characterized for CL = 50 pF and CL = 150 pF in Sections 6.6 and 6.7 of the datasheet. At 5.5 V, tpd remains within spec up to 150 pF, and output drive (±6 mA) ensures signal integrity into typical PCB trace + connector capacitance. For loads exceeding 150 pF, derating or adding series termination is recommended.
Is SN74HCT245DWRG4 pin-compatible with other 74HCT245 variants?
Yes, SN74HCT245DWRG4 shares identical 20-pin SOIC (DW) pinout and electrical functionality with SN74HCT245DWR, SN74HCT245DWRE4, and SN74HCT245DWRG4 - all conform to JEDEC MS-013AC. Differences are limited to packaging markings and surface finish (NiPdAu), not pin assignment or logic behavior.
How does the OE pin function in SN74HCT245DWRG4?
The OE pin on SN74HCT245DWRG4 is active-low: when high, all A and B port outputs enter high-impedance (3-state) mode, effectively isolating both buses. When low, outputs are enabled and respond to DIR state. Inputs remain functional regardless of OE state, as confirmed in Pin Functions table (Section 5) of the TI datasheet.
SN74HCT245DWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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:
- 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
SN74HCT245DWRG4 FAQ
1.How can I place an order for SN74HCT245DWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCT245DWRG4 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 SN74HCT245DWRG4 reliable?
The price and inventory of SN74HCT245DWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCT245DWRG4 is usually 5 days.
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SN74HCT245DWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCT245DWRG4 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 SN74HCT245DWRG4?
For technical support, including SN74HCT245DWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCT245DWRG4 requirements.
6.How does Aetrix verify that SN74HCT245DWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74HCT245DWRG4 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 SN74HCT245DWRG4 meets industry standards.
7.What is the process for return or replacement of SN74HCT245DWRG4?
All SN74HCT245DWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCT245DWRG4, 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 SN74HCT245DWRG4 part is unused and in its original packaging.
Return procedure for SN74HCT245DWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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