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Texas Instruments SN74HC245PWG4
- Part No.:
- SN74HC245PWG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74HC245PWG4.pdf
- Description:
- IC TXRX NON-INVERT 6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,862
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Product details
Overview
SN74HC245PWG4 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 across 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 interfaces.
For engineers reviewing the SN74HC245PWG4 datasheet, SN74HC245PWG4 pinout, SN74HC245PWG4 application, or SN74HC245PWG4 equivalent, key selection criteria include its wide VCC range, 3-state bus isolation capability, low ICC (80 µA max), 20-pin TSSOP package footprint, and compatibility with LSTTL loads - all critical for legacy-to-modern voltage-level bridging in embedded controllers and peripheral interfaces.
Technical Context
The SN74HC245PWG4 implements dual-control logic: DIR selects data flow direction (A→B or B→A), while OE enables/disables all eight transceiver channels simultaneously into high-impedance state. Its CMOS design ensures balanced rise/fall times and reduced output ringing, making it suitable for noise-sensitive bus environments.
It complies with HC logic family characteristics - including input thresholds referenced to VCC (VIH = 0.7×VCC, VIL = 0.3×VCC), rail-to-rail output swing, and input leakage ≤1 µA - and supports operation from –40°C to +85°C, matching commercial-grade system requirements without derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 6 V - enables interoperability between 3.3 V and 5 V domains without level shifters. |
| Output Drive | ±6 mA at 5 V - sufficient to directly drive up to 15 LSTTL loads without external buffers. |
| Propagation Delay | 12 ns typical (CL = 50 pF, VCC = 4.5 V) - supports >30 MHz bus toggle rates in synchronous applications. |
| ICC (Max) | 80 µA - ensures ultra-low static power in battery-backed or always-on subsystems. |
| Input Leakage | 1 µA max - prevents unintended logic transitions when inputs are pulled via high-value resistors. |
| ESD Rating | ±3000 V HBM - meets standard handling requirements for automated PCB assembly lines. |
| Operating Temp | –40°C to +85°C - qualified for industrial temperature range without thermal derating. |
Pinout & Package
TSSOP-20 (PW) package, 6.50 mm × 4.40 mm body size, 0.65 mm lead pitch, RoHS-compliant NiPdAu lead finish, MSL Level-1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction Control Input | High = A→B data flow; Low = B→A - determines real-time bus polarity without clock or timing constraints. |
| 2–9 (A1–A8) | Port A I/O | Bidirectional data terminals for first bus segment; high-impedance when OE = high. |
| 10 (GND) | Ground Reference | Primary return path for all internal logic and output current; must be low-inductance connection. |
| 11–18 (B8–B1) | Port B I/O | Bidirectional data terminals for second bus segment; mirrored pin order supports compact layout routing. |
| 19 (OE) | Output Enable Input | Active-low - asserts high-impedance on both A and B ports simultaneously for bus arbitration or hot-swap isolation. |
| 20 (VCC) | Power Supply | Single supply pin - requires local 0.1 µF ceramic bypass capacitor placed within 3 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| Wide VCC range (2–6 V) | Eliminates need for separate voltage translators when interfacing mixed-supply subsystems (e.g., 3.3 V MCU to 5 V peripheral). |
| 3-State bus isolation | Enables multi-master bus architectures by allowing clean contention-free sharing of A/B data paths under OE control. |
| Low dynamic power | 40 pF typical power dissipation capacitance per transceiver - reduces switching current and EMI in high-frequency data bursts. |
| Slow edge rate optimization | Controlled slew minimizes overshoot/undershoot on unterminated traces, easing signal integrity in cost-sensitive PCB layouts. |
| CMOS input compatibility | Accepts TTL- and CMOS-level signals without external biasing - simplifies integration with legacy and modern logic families. |
Applications
| PC Motherboard I/O Buffering | Industrial PLC Backplane Interface |
|---|---|
|
Use Scenario: Isolating legacy ISA or LPC bus segments from microcontroller-based management units in embedded PCs. IC Role / Device Role / Timing Role: Bidirectional data bridge with direction and enable control synchronized to host CPU strobes. Use Value: Enables voltage-domain translation (3.3 V ↔ 5 V) and bus contention avoidance during firmware updates or diagnostics. |
Use Scenario: Connecting modular I/O cards to a central controller over parallel backplane wiring in programmable logic controllers. IC Role / Device Role / Timing Role: Octal transceiver providing isolated, direction-switchable data lanes between slot and baseboard. Use Value: Supports hot-swap-safe insertion/removal via OE-controlled high-Z state, preventing bus glitches during card replacement. |
| Medical Device Data Acquisition Hub | Automotive Body Control Module |
|
Use Scenario: Aggregating sensor readings from multiple analog front-end boards into a central ARM Cortex-M4 processor. IC Role / Device Role / Timing Role: Synchronous data funnel with DIR toggled per acquisition cycle and OE asserted during ADC conversion windows. Use Value: Reduces component count vs. discrete buffer solutions while maintaining <100 ns timing margin for real-time sampling. |
Use Scenario: Interfacing 5 V CAN transceivers and LIN drivers with a 3.3 V automotive microcontroller in body electronics modules. IC Role / Device Role / Timing Role: Voltage-tolerant bus translator managing bidirectional diagnostic command/response traffic. Use Value: Eliminates risk of latch-up or damage from supply mismatch, verified across –40°C to +85°C ambient operating range. |
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); higher speed (tpd = 5.3 ns @ 3.3 V); ±24 mA drive. | Optimized for 3.3 V-only systems; not suitable for 5 V bus interfacing without level shifting. | Select when operating exclusively in 3.3 V domain and requiring faster throughput or stronger drive. |
| 74ACT245SCX | Higher drive (±24 mA @ 5 V); TTL-compatible inputs; 5 V only; higher ICC (40 mA max). | Designed for high-noise industrial environments with strict TTL threshold compliance. | Prefer where legacy TTL signal integrity or robustness against ground bounce is prioritized over power efficiency. |
Compared with SN74HC245PWG4, SN74LVC245APWR offers superior speed and drive in low-voltage systems but lacks 5 V tolerance, while 74ACT245SCX provides rugged TTL interface margins at the cost of significantly higher static power - making SN74HC245PWG4 the optimal balance for mixed-voltage, low-power, general-purpose bus isolation.
Availability
SN74HC245PWG4 is available at Aetrix Electronics and suitable for PC motherboard designs, industrial PLC backplanes, medical data acquisition hubs, and automotive body control modules requiring stable component supply across extended production lifecycles.
Supply support for SN74HC245PWG4 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 ICs, with decades of heritage in industry-standard logic families.
The SN74HC245PWG4 belongs to TI's 74HC logic series - engineered for low-power, wide-supply-voltage interoperability in digital interface and bus management applications across computing, industrial, and automotive markets.
FAQ
What is the maximum output current per pin for SN74HC245PWG4?
The SN74HC245PWG4 supports ±6 mA output drive per pin at VCC = 5 V, with absolute maximum continuous output current rated at ±35 mA per pin. This allows direct driving of LSTTL loads without external buffers while staying within safe SOA limits under steady-state conditions.
Does SN74HC245PWG4 support 3.3 V and 5 V mixed-bus interfacing?
Yes, SN74HC245PWG4 operates across 2 V to 6 V, enabling seamless bidirectional data transfer between 3.3 V and 5 V buses. Its input thresholds scale with VCC (VIH ≈ 0.7×VCC), and outputs swing rail-to-rail - eliminating need for external level-shifting circuitry in mixed-voltage systems.
How does the OE pin function on SN74HC245PWG4?
The OE (output enable) pin on SN74HC245PWG4 is active-low: when OE = low, the transceiver passes data according to DIR; when OE = high, all A and B port pins enter high-impedance state, electrically isolating both buses - essential for bus arbitration and hot-swap safety in multi-drop configurations.
What is the thermal resistance (RθJA) of the SN74HC245PWG4 in its TSSOP package?
The SN74HC245PWG4 in PW (TSSOP-20) package has a junction-to-ambient thermal resistance (RθJA) of 99.7°C/W, measured under standard JEDEC JESD51-2 conditions. This value assumes a 1-inch² copper pad on a 1-layer board; actual performance improves with enhanced PCB copper area or thermal vias.
Can SN74HC245PWG4 replace older 74LS245 devices in existing designs?
SN74HC245PWG4 can replace 74LS245 in most cases due to identical pinout, function table, and 3-state behavior - but requires verification of VCC compatibility (74LS245 is 5 V only, while SN74HC245PWG4 supports 2–6 V) and load drive margin (±6 mA vs. ±8 mA for LS). No PCB changes are needed if operating at 5 V with compatible fanout.
SN74HC245PWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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
SN74HC245PWG4 FAQ
1.How can I place an order for SN74HC245PWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC245PWG4 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 SN74HC245PWG4 reliable?
The price and inventory of SN74HC245PWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC245PWG4 is usually 5 days.
3.What payment methods are accepted for SN74HC245PWG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC245PWG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC245PWG4?
SN74HC245PWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC245PWG4 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 SN74HC245PWG4?
For technical support, including SN74HC245PWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC245PWG4 requirements.
6.How does Aetrix verify that SN74HC245PWG4 is sourced from the original manufacturer or authorized distributors?
All SN74HC245PWG4 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 SN74HC245PWG4 meets industry standards.
7.What is the process for return or replacement of SN74HC245PWG4?
All SN74HC245PWG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC245PWG4, 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 SN74HC245PWG4 part is unused and in its original packaging.
Return procedure for SN74HC245PWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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