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Texas Instruments SN74HC245PWT
- Part No.:
- SN74HC245PWT
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74HC245PWT.pdf
- Description:
- IC TXRX NON-INVERT 6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,830
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Product details
Overview
SN74HC245PWT 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 draws ≤80 µA supply current - enabling low-power, noise-resilient bus interfacing in embedded controllers and peripheral bridges.
For engineers reviewing the SN74HC245PWT datasheet, SN74HC245PWT pinout, SN74HC245PWT application, or SN74HC245PWT equivalent, key selection criteria include its 20-pin TSSOP package, DIR/OE dual-control logic, 3-state isolation capability, and compatibility with 3.3 V/5 V mixed-voltage system interconnects.
Technical Context
The SN74HC245PWT implements a CMOS-based octal transceiver architecture with independent direction (DIR) and output-enable (OE) control inputs. Its functional modes - A→B, B→A, and high-impedance isolation - are determined solely by DIR and OE logic levels, eliminating external timing dependencies.
It features balanced output drive, slow edge rates to suppress ringing, and input clamp diodes supporting ESD robustness (±3000 V HBM). The device complies with standard HC logic thresholds and maintains stable operation across –40°C to +85°C ambient temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 6 V - supports interoperability across 3.3 V and 5 V logic domains without level shifters |
| Propagation Delay (tpd) | 12 ns typical at VCC = 6 V, CL = 50 pF - enables reliable timing in high-speed bus handshaking |
| Output Drive Strength | ±6 mA at VCC = 5 V - sufficient to drive 15 LSTTL loads directly, reducing need for buffer stages |
| Quiescent Supply Current (ICC) | ≤80 µA max - minimizes standby power in battery-backed or energy-sensitive applications |
| Input Leakage Current | ≤1 µA max - ensures predictable logic levels even with high-impedance pull-ups or floating controls |
| ESD Rating (HBM) | ±3000 V - meets industrial handling requirements without additional protection circuitry |
| Operating Temperature | –40°C to +85°C - qualified for commercial and industrial-grade embedded environments |
Pinout & Package
TSSOP-20 (PW) package: 6.50 mm × 4.40 mm body, 0.65 mm lead pitch, surface-mount, RoHS-compliant, moisture sensitivity level 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction Control Input | Determines data flow direction: DIR = L enables B→A; DIR = H enables A→B |
| 2–9 (A1–A8) | Port A I/O | Bidirectional data lines connected to source bus; high-impedance when OE = H |
| 10 (GND) | Ground Reference | Primary return path for all internal logic and output currents |
| 11–18 (B1–B8) | Port B I/O | Bidirectional data lines connected to destination bus; isolated when OE = H |
| 19 (OE) | Output Enable Input | Active-low control: OE = L enables transceiver; OE = H forces all A/B pins into high-Z state |
| 20 (VCC) | Power Supply | Single-supply rail supporting 2–6 V operation; requires local 0.1 µF bypass capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Wide VCC range (2–6 V) | Enables direct interface between 3.3 V microcontrollers and 5 V peripherals without voltage translation |
| Asynchronous bidirectional control | Eliminates clock domain synchronization overhead in bus bridging and FPGA-to-ASIC interconnects |
| High-current 3-state outputs | Supports hot-swap capability and bus sharing among multiple masters via OE-driven isolation |
| Low input current (≤1 µA) | Reduces loading on upstream drivers and allows long trace routing without signal integrity degradation |
| Slow edge rate design | Minimizes output ringing and EMI in unterminated or lightly loaded PCB traces |
Applications
| Server Backplane Interfacing | Industrial PLC I/O Expansion |
|---|---|
Use Scenario: Isolating CPU address/data buses from add-in PCIe or SATA controller cards in modular server chassis. IC Role / Device Role / Timing Role: Bidirectional bus transceiver managing synchronous data bursts between host and expansion modules under DIR/OE arbitration. Use Value: Enables clean bus segmentation with <12 ns latency and zero contention risk during hot-plug events. |
Use Scenario: Bridging 3.3 V ARM-based controller outputs to 24 V discrete I/O modules in programmable logic controllers. IC Role / Device Role / Timing Role: Level-flexible, direction-controlled data shuttle translating between low-voltage logic and industrial fieldbus interfaces. Use Value: Eliminates external level shifters while maintaining ESD-hardened signal integrity across noisy factory environments. |
| Wearable Health Sensor Hub | Network Switch Management Interface |
Use Scenario: Multiplexing sensor data streams (ECG, SpO₂, accelerometer) onto a shared SPI/I²C bus in ultra-low-power wearable devices. IC Role / Device Role / Timing Role: Low-quiescent-current (≤80 µA) bus isolator enabling selective sensor activation without waking main MCU. Use Value: Extends battery life by >15% versus standard buffers due to sub-100 µA ICC and controlled enable sequencing. |
Use Scenario: Interfacing management ASICs to PHY registers and EEPROM configuration storage in 1U rack-mounted switches. IC Role / Device Role / Timing Role: High-reliability, 3-state-isolated bus extender supporting concurrent read/write access to multiple PHYs. Use Value: Prevents bus contention during firmware updates and enables deterministic register polling with <22 ns disable time (tdis). |
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 (6.7 ns @ 3.3 V); higher drive (±24 mA) | Optimized for 3.3 V-only systems; not suitable for 5 V bus interfacing | Select when operating exclusively in 3.3 V domains requiring higher speed and drive |
| 74ACT245SCX | Higher VCC (4.5–5.5 V); TTL-compatible inputs; stronger drive (±24 mA); higher ICC (4 mA typical) | Designed for legacy 5 V TTL systems; incompatible with 3.3 V logic thresholds | Select only for pure 5 V TTL environments where HC-level noise immunity is not required |
Compared with SN74HC245PWT, SN74LVC245APWR offers superior speed and drive in 3.3 V systems but lacks 5 V tolerance, while 74ACT245SCX provides robust 5 V TTL interfacing at the cost of higher power and no mixed-voltage flexibility.
Availability
SN74HC245PWT is available at Aetrix Electronics and suitable for server backplanes, industrial PLCs, wearable sensor hubs, and network switch management interfaces requiring stable component supply across extended production lifecycles.
Supply support for SN74HC245PWT 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 connectivity technologies, with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74HC245PWT belongs to TI's industry-standard 74HC logic family, engineered for robust, low-power, mixed-voltage digital interfacing in commercial and industrial equipment where reliability and wide supply range are critical.
FAQ
What is the maximum recommended operating voltage for SN74HC245PWT?
The absolute maximum supply voltage for SN74HC245PWT is 7 V, but the recommended operating range is 2 V to 6 V per TI's SCLS131F datasheet. Operation above 6 V risks parametric shift and reduced reliability; sustained use at 6 V is fully supported and commonly deployed in 5 V systems with margin.
Does SN74HC245PWT support hot-swap or live insertion?
Yes - SN74HC245PWT supports hot-swap operation when OE is held high (disabled) during insertion. Its 3-state outputs prevent bus contention, and its ±3000 V HBM ESD rating protects against handling-induced transients. TI recommends tying OE to VCC via a pull-up resistor during power-up to ensure default isolation.
Can SN74HC245PWT interface between 3.3 V and 5 V buses without level shifters?
Yes - SN74HC245PWT's 2–6 V supply range and CMOS input thresholds (VIH = 3.15 V min at VCC = 4.5 V) allow direct connection of 3.3 V outputs to its inputs when powered at 5 V, and 5 V outputs to its inputs when powered at 3.3 V (with VIH/VIL verified per Section 6.3). No external level shifters are needed.
What is the typical propagation delay of SN74HC245PWT at 3.3 V supply?
At VCC = 3.3 V and CL = 50 pF, the typical propagation delay (tpd) of SN74HC245PWT is 18 ns (per Table 6.6, interpolated from 2 V and 4.5 V data). This value reflects worst-case A↔B or B↔A signal transit under standard load conditions and is validated across the full operating temperature range.
How does the DIR pin function in SN74HC245PWT?
The DIR pin on SN74HC245PWT is a dedicated direction-control input: when DIR = LOW, data flows from Port B to Port A; when DIR = HIGH, data flows from Port A to Port B. This control is asynchronous and independent of OE - DIR only affects active-direction data paths, not high-impedance state entry/exit.
SN74HC245PWT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
SN74HC245PWT FAQ
1.How can I place an order for SN74HC245PWT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC245PWT 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 SN74HC245PWT reliable?
The price and inventory of SN74HC245PWT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC245PWT is usually 5 days.
3.What payment methods are accepted for SN74HC245PWT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC245PWT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC245PWT?
SN74HC245PWT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC245PWT 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 SN74HC245PWT?
For technical support, including SN74HC245PWT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC245PWT requirements.
6.How does Aetrix verify that SN74HC245PWT is sourced from the original manufacturer or authorized distributors?
All SN74HC245PWT 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 SN74HC245PWT meets industry standards.
7.What is the process for return or replacement of SN74HC245PWT?
All SN74HC245PWT units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC245PWT, 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 SN74HC245PWT part is unused and in its original packaging.
Return procedure for SN74HC245PWT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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