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Texas Instruments SN74HC245DWR
- Part No.:
- SN74HC245DWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74HC245DWR.pdf
- Description:
- IC TXRX NON-INVERT 6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:9,862
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Product details
Overview
SN74HC245DWR from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between A and B buses in digital systems. It operates from 2 V to 6 V, delivers ±6 mA output drive at 5 V, exhibits typical propagation delay of 12 ns (VCC = 6 V, CL = 50 pF), and supports isolation via active-low output enable (OE) and direction control (DIR). It is used in PC motherboard I/O buffering and industrial controller backplane interfaces.
For engineers reviewing the SN74HC245DWR datasheet, SN74HC245DWR pinout, SN74HC245DWR application, or SN74HC245DWR equivalent, key selection criteria include its 20-pin SOIC (DW) package, wide supply voltage range, low ICC (80 µA max), 3-state bus isolation capability, and compatibility with LSTTL loads.
Technical Context
The SN74HC245DWR implements dual-control logic: DIR selects data flow direction (A→B or B→A), while OE enables or disables all eight transceiver channels into high-impedance state. Its CMOS design ensures balanced rise/fall times and reduced output ringing, critical for noise-sensitive bus environments.
It complies with HC logic family specifications, supports mixed-voltage interfacing across 2–6 V, and features input clamp diodes and ESD protection rated to ±3000 V HBM. Thermal resistance (RθJA) is 77.0 °C/W in the DW package, enabling reliable operation up to +85 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2 V to 6 V - enables direct interface with 3.3 V and 5 V logic domains without level shifters |
| Output Drive | ±6 mA at 5 V - sufficient to drive up to 15 LSTTL loads per channel |
| Propagation Delay | 12 ns typical (VCC = 6 V, CL = 50 pF) - supports 30+ MHz bus clocking in non-critical timing paths |
| Quiescent Current | 80 µA max - minimizes standby power in battery-backed or energy-constrained systems |
| Input Leakage | 1 µA max - prevents unintended logic transitions on unterminated or high-impedance control lines |
| ESD Rating | ±3000 V HBM - meets standard handling requirements for automated assembly and field service |
| Operating Temperature | –40 °C to +85 °C - qualified for commercial and industrial-grade embedded applications |
Pinout & Package
SN74HC245DWR 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 compatible with IPC-7351B footprint IPC7351SOIC20_1280X750X265-20N.
| 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 polarity |
| 2–9 (A1–A8) | Port A I/O | Bidirectional data terminals connected to first bus segment; high-impedance when OE = High |
| 10 (GND) | Ground reference | Primary return path for all internal logic and output currents; must be low-inductance connection |
| 11–18 (B1–B8) | Port B I/O | Bidirectional data terminals connected to second bus segment; isolated when OE = High |
| 19 (OE) | Output enable input | Active-low - drives all A/B outputs to high-Z when High; critical for bus arbitration |
| 20 (VCC) | Power supply | Single supply rail supporting full 2–6 V operating range; requires local 0.1 µF bypass capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Wide VCC range (2–6 V) | Enables interoperability between legacy 5 V and modern 3.3 V subsystems without external level translation |
| 3-State bus isolation | Prevents contention during multi-master bus arbitration by placing outputs in high-impedance state when OE is inactive |
| Low power consumption | 80 µA max ICC allows integration into always-on monitoring circuits without thermal or battery-life penalty |
| Controlled edge rates | Slower transitions minimize overshoot/undershoot on PCB traces, reducing EMI and signal integrity issues |
| High noise immunity | VIH/VIL thresholds scale with VCC (e.g., 3.15 V/1.35 V at 4.5 V), ensuring robust switching in electrically noisy environments |
Applications
| PC Motherboard I/O Expansion | Industrial PLC Backplane Interface |
|---|---|
Use Scenario: Buffering parallel GPIO, ISA-style peripheral address/data lines, or legacy LPC bus signals between chipset and add-in cards. IC Role / Device Role / Timing Role: Bidirectional level-shifting transceiver managing data flow direction and bus contention under software-controlled DIR/OE signals. Use Value: Eliminates need for discrete directional buffers and enables shared bus architecture with deterministic isolation timing (tdis = 43 ns max at 6 V). | Use Scenario: Interfacing microcontroller-based I/O modules to centralized backplane in modular PLC racks. IC Role / Device Role / Timing Role: Isolating field-side sensor/actuator data buses from CPU-side control logic during hot-swap or fault conditions. Use Value: Ensures safe bus disconnection (ten = 49 ns max) and prevents latch-up during module insertion/removal. |
| Medical Device Data Acquisition Hub | Automated Test Equipment (ATE) Signal Routing |
Use Scenario: Aggregating analog front-end digitizer outputs (e.g., ADC FIFO data) to a central FPGA processing unit in portable diagnostics gear. IC Role / Device Role / Timing Role: Synchronizing burst-mode data transfers across voltage-domain boundaries while maintaining signal fidelity. Use Value: Delivers 12 ns tpd and <0.33 V VOL at 6 mA load - preserves logic margins in low-voltage, high-precision measurement paths. | Use Scenario: Dynamically reconfiguring test signal paths between DUT interface boards and pattern generators in rack-mounted ATE systems. IC Role / Device Role / Timing Role: Enabling programmable bus routing via DIR/OE under microcontroller supervision for multi-DUT parallel testing. Use Value: Supports >30 MHz toggle rate with predictable enable/disable latency (tdis/ten ≤ 58 ns), improving test cycle efficiency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT245DWR | TTL-compatible inputs (VIH = 2 V min); identical pinout and DC specs; slightly higher ICC (160 µA max) | Better suited for mixed 5 V TTL/CMOS systems where input threshold matching is required | Select when interfacing legacy TTL peripherals without pull-up resistors on control lines |
| 74LCX245MTCX | Lower VCC range (2.0–3.6 V); 3.6 V tolerant I/O; 5 ns tpd (CL = 50 pF); different pinout (TSSOP-20) | Optimized for 3.3 V-only systems with tighter timing budgets and lower power targets | Choose for new 3.3 V designs requiring faster switching and guaranteed 5 V-tolerant inputs |
Compared with SN74HC245DWR, SN74HCT245DWR offers TTL input compatibility at the cost of higher quiescent current, while 74LCX245MTCX provides superior speed and 5 V tolerance in 3.3 V systems but requires PCB layout revision due to TSSOP packaging and non-identical pin mapping.
Availability
SN74HC245DWR is available at Aetrix Electronics and suitable for PC motherboard I/O expansion, industrial PLC backplane interfaces, and medical device data acquisition hubs requiring stable component supply across extended production lifecycles.
Supply support for SN74HC245DWR 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 company specializing in analog, embedded processing, and logic solutions with over 50 years of leadership in industrial and automotive electronics.
The SN74HC245DWR belongs to TI's 74HC logic family, engineered for robust, low-power bidirectional bus interfacing in commercial and industrial applications where voltage flexibility and bus contention control are essential.
FAQ
What is the maximum recommended operating voltage for SN74HC245DWR?
The absolute maximum supply voltage for SN74HC245DWR is 7 V, but the recommended operating range is 2 V to 6 V per TI's SCLS131F datasheet. Operating continuously above 6 V risks parametric degradation and reduced reliability. For long-term stability in commercial applications, 5 V or 3.3 V is typically used - both fully supported by SN74HC245DWR's input thresholds and output drive specifications.
Does SN74HC245DWR support hot-swap or live insertion?
SN74HC245DWR is not hot-swap certified, but its 3-state outputs and controlled turn-off timing (tdis ≤ 58 ns at 6 V) allow safe use in live-insertion scenarios when OE is asserted before power application. TI recommends tying OE to VCC via a pullup resistor during power-up to ensure high-impedance state at startup - a practice validated in SN74HC245DWR application notes for backplane interfaces.
Can SN74HC245DWR drive 5 V TTL loads directly?
Yes, SN74HC245DWR can drive standard LSTTL loads directly: its ±6 mA output drive at 5 V meets the LSTTL input current requirement (±0.4 mA), and VOH/VOL values (≥3.98 V / ≤0.33 V at 6 mA) exceed LSTTL VIH/VIL thresholds. This eliminates external drivers in mixed 5 V TTL-CMOS systems - a capability confirmed in SN74HC245DWR's "High-Current 3-State Outputs" feature list.
What is the thermal resistance (RθJA) of SN74HC245DWR in its SOIC package?
The junction-to-ambient thermal resistance (RθJA) for SN74HC245DWR in the DW (SOIC-20) package is 77.0 °C/W, as specified in Section 6.4 of the TI SCLS131F datasheet. This value assumes standard JEDEC 2-layer board conditions; actual performance improves with added copper area or thermal vias. At 80 µA ICC and 5 V operation, self-heating remains negligible (<0.02 °C), making derating unnecessary for most applications.
How does the DIR pin function in SN74HC245DWR?
In SN74HC245DWR, the DIR pin controls data direction unidirectionally: when DIR = Low, data flows from Port B to Port A; when DIR = High, data flows from Port A to Port B. This logic-level control is synchronous with OE - both must be stable before valid data transfer. The function table in Section 8.4 of the datasheet confirms DIR's role as the sole determinant of bus polarity, independent of OE state.
SN74HC245DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74HC245DWR FAQ
1.How can I place an order for SN74HC245DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC245DWR 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 SN74HC245DWR reliable?
The price and inventory of SN74HC245DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC245DWR is usually 5 days.
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SN74HC245DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC245DWR 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 SN74HC245DWR?
For technical support, including SN74HC245DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC245DWR requirements.
6.How does Aetrix verify that SN74HC245DWR is sourced from the original manufacturer or authorized distributors?
All SN74HC245DWR 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 SN74HC245DWR meets industry standards.
7.What is the process for return or replacement of SN74HC245DWR?
All SN74HC245DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC245DWR, 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 SN74HC245DWR part is unused and in its original packaging.
Return procedure for SN74HC245DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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