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Texas Instruments SN74HC245PW
- Part No.:
- SN74HC245PW
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74HC245PW.pdf
- Description:
- IC TXRX NON-INVERT 6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,553
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Product details
Overview
SN74HC245PW 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 (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 backplane interface applications.
For engineers reviewing the SN74HC245PW datasheet, SN74HC245PW pinout, SN74HC245PW application, or SN74HC245PW equivalent, key selection criteria include its 20-pin TSSOP package, 3-state bidirectional bus control logic, wide supply voltage range, low ICC (80 µA max), and compatibility with LSTTL loads.
Technical Context
The SN74HC245PW implements dual-control asynchronous bus transceivers using silicon-gate CMOS technology. Its DIR input selects data flow direction (A→B or B→A), while OE enables or disables all eight channels simultaneously into high-impedance state - critical for bus sharing and hot-swap isolation.
It features balanced output drive, slow edge rates to suppress ringing, and input thresholds compatible with both TTL and CMOS logic families across its full 2–6 V operating range. The device meets JEDEC JESD78 Class II latch-up immunity and supports operation from –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2 V to 6 V - enables interoperability between 3.3 V and 5 V domains without level shifters |
| Propagation Delay | 12 ns typical (VCC = 4.5 V, CL = 50 pF) - supports up to ~40 MHz bus toggle rates in non-critical timing paths |
| Output Drive | ±6 mA at 5 V - sufficient to directly drive 15 LSTTL loads or short PCB traces |
| ICC (Max) | 80 µA - enables low-static-power system design in battery-backed or always-on interfaces |
| Input Current | 1 µA max - eliminates need for external pull-up/down resistors on DIR/OE in most cases |
| ESD Rating | ±3000 V HBM - meets standard handling requirements for automated assembly environments |
Pinout & Package
Packaged in a 20-pin Thin Shrink Small Outline Package (TSSOP), the SN74HC245PW measures 6.50 mm × 4.40 mm with 0.65 mm lead pitch and exposed pad not present. This RoHS-compliant, surface-mount package supports reflow soldering per MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction Control Input | Logic level determines data path: low = B→A, high = A→B; must be stable before OE activation |
| 2–9 (A1–A8) | Port A I/O | Bidirectional data terminals connected to first bus; high-impedance when OE = high |
| 10 (GND) | Ground Reference | Primary return path for all internal logic and output current; requires low-inductance connection |
| 11–18 (B1–B8) | Port B I/O | Bidirectional data terminals connected to second bus; functionally identical to A-side pins |
| 19 (OE) | Output Enable Input | Active-low control: low = transceiver enabled, high = all outputs in high-Z state |
| 20 (VCC) | Power Supply | Single positive supply rail (2–6 V); requires local 0.1 µF ceramic bypass capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Wide VCC Range | 2 V to 6 V operation allows direct interfacing between mixed-voltage subsystems (e.g., 3.3 V MCU to 5 V peripheral) |
| High-Current 3-State Outputs | ±6 mA drive capability at 5 V ensures robust signal integrity driving capacitive loads up to 50 pF without external buffers |
| Low Power Consumption | 80 µA max ICC enables use in power-sensitive applications such as portable instrumentation and standby-mode controllers |
| Control Logic Minimizes Timing Constraints | DIR and OE operate asynchronously - no clock required, eliminating setup/hold timing analysis for bus arbitration |
| Slow Edge Rate Design | Intentionally limited slew rate reduces EMI and output ringing on unterminated PCB traces |
Applications
| PC Motherboard I/O Buffering | Industrial Backplane Interface |
|---|---|
Use Scenario: Isolating legacy parallel port or ISA-bus peripherals from modern low-voltage CPU I/O while maintaining signal integrity. IC Role / Device Role / Timing Role: Bidirectional level-tolerant bus transceiver managing data flow between 5 V printer controller and 3.3 V chipset southbridge. Use Value: Eliminates need for discrete level shifters and reduces board space by integrating eight channels in one TSSOP-20 package. | Use Scenario: Enabling hot-plug capability in modular PLC backplanes where modules may be inserted or removed during operation. IC Role / Device Role / Timing Role: Bus isolator that places all I/O lines in high-impedance state upon module insertion/removal detection via OE control. Use Value: Prevents bus contention and signal corruption during live module replacement, improving system reliability and maintenance safety. |
| Wearable Health Sensor Hub | Network Switch Management Interface |
Use Scenario: Interfacing multiple low-power analog sensor front-ends (ECG, SpO₂) to a central microcontroller over shared I²C/SPI lines. IC Role / Device Role / Timing Role: Direction-controlled data multiplexer enabling time-shared access to sensors without dedicated routing per channel. Use Value: Reduces pin count on the host MCU and simplifies firmware by allowing single-port polling of multiple sensors via DIR toggling. | Use Scenario: Connecting management microcontrollers to PHY registers and status LEDs across different voltage domains in 1U rack switches. IC Role / Device Role / Timing Role: Voltage-flexible bus buffer supporting simultaneous 3.3 V register reads and 5 V LED drive signals on same physical bus. Use Value: Enables unified control plane hardware design across generations of switch ASICs with varying I/O voltage requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245APWR | Lower VCC range (1.65–3.6 V), faster tpd (6.1 ns @ 3.3 V), higher drive (±24 mA), but not 5 V tolerant | Suitable only in pure 3.3 V systems; cannot replace SN74HC245PW in mixed 5 V/3.3 V environments | Select when speed and drive strength outweigh voltage flexibility needs |
| 74ACT245SCX | Higher drive (±24 mA), TTL-compatible inputs, 4.5–5.5 V only, higher ICC (4 mA typical) | Requires strict 5 V supply; unsuitable for battery-powered or multi-rail designs | Choose for legacy 5 V-only systems needing stronger drive and faster edges than HC logic |
Compared with SN74HC245PW, SN74LVC245APWR offers superior speed and drive in 3.3 V-only systems but sacrifices 5 V tolerance, while 74ACT245SCX delivers higher performance in fixed 5 V rails at the cost of increased power and reduced voltage adaptability.
Availability
SN74HC245PW is available at Aetrix Electronics and suitable for PC motherboard I/O buffering, industrial backplane interface, and wearable health sensor hub applications requiring stable component supply and long-term production continuity.
Supply support for SN74HC245PW 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 and embedded processing solutions, with leadership in logic, power management, and signal chain technologies.
The SNx4HC245 product line was developed to provide robust, voltage-flexible bus interface ICs for mixed-signal systems requiring bidirectional data transfer, isolation, and compatibility across legacy and modern logic families.
FAQ
What is the maximum operating temperature for the SN74HC245PW?
The SN74HC245PW is rated for operation from –40°C to +85°C ambient temperature. This industrial-grade thermal range ensures reliable performance in embedded computing, networking equipment, and industrial control applications where ambient conditions exceed commercial limits. The device's thermal resistance (RθJA = 99.7°C/W in PW package) supports adequate self-heating margin under typical load conditions.
Does the SN74HC245PW support 5 V logic levels when powered from 3.3 V?
No, the SN74HC245PW does not support 5 V-tolerant inputs when VCC = 3.3 V. Its input thresholds scale with VCC (VIH ≈ 0.7×VCC), so at 3.3 V supply, VIH is ~2.3 V - insufficient to reliably recognize 5 V logic highs. To interface 5 V signals, SN74HC245PW must be operated at VCC = 5 V or paired with external level-shifting circuitry.
Can the SN74HC245PW be used for unidirectional data transfer?
Yes, the SN74HC245PW can be configured for unidirectional operation by holding DIR at a fixed logic level (high for A→B, low for B→A) while using OE to gate data flow. This configuration is commonly applied in memory-mapped I/O expansion or peripheral address/data bus isolation, where direction is statically determined by system architecture rather than runtime control.
What is the recommended bypass capacitor for the SN74HC245PW VCC pin?
A 0.1 µF ceramic capacitor placed as close as possible to the VCC pin (Pin 20) is the recommended bypass solution for the SN74HC245PW. This value effectively suppresses high-frequency noise generated during output switching transitions. For systems with significant power supply ripple or adjacent high-speed components, paralleling a 1 µF tantalum or X7R ceramic capacitor improves low-frequency decoupling without compromising layout compactness.
Is the SN74HC245PW pin-compatible with other packages in the SN74HC245 family?
Yes, the SN74HC245PW shares identical pin numbering and signal assignment with all 20-pin variants of the SN74HC245 family - including DB (SSOP), DW (SOIC), NS (SOP), and N (PDIP) packages. This allows direct PCB footprint substitution between packages during prototyping or cost optimization, provided mechanical constraints (height, thermal pad, solder stencil) are verified for the target assembly process.
SN74HC245PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- 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:
- 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-TSSOP
SN74HC245PW FAQ
1.How can I place an order for SN74HC245PW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC245PW 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 SN74HC245PW reliable?
The price and inventory of SN74HC245PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC245PW is usually 5 days.
3.What payment methods are accepted for SN74HC245PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC245PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC245PW?
SN74HC245PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC245PW 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 SN74HC245PW?
For technical support, including SN74HC245PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC245PW requirements.
6.How does Aetrix verify that SN74HC245PW is sourced from the original manufacturer or authorized distributors?
All SN74HC245PW 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 SN74HC245PW meets industry standards.
7.What is the process for return or replacement of SN74HC245PW?
All SN74HC245PW units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC245PW, 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 SN74HC245PW part is unused and in its original packaging.
Return procedure for SN74HC245PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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