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Texas Instruments SN74LVC245ADW
- Part No.:
- SN74LVC245ADW
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74LVC245ADW.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,719
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Product details
Overview
SN74LVC245ADW from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for bidirectional asynchronous data transfer between 1.65-V to 3.6-V buses. It features direction control (DIR), output enable (OE), 8 I/O channels per side, 6.3 ns max propagation delay at 3.3 V, and 5.5-V tolerant inputs - enabling mixed-voltage interfacing in industrial I/O expanders and LED display controllers.
For engineers reviewing the SN74LVC245ADW datasheet, SN74LVC245ADW pinout, SN74LVC245ADW application, or SN74LVC245ADW equivalent, key selection criteria include its 3.6-V max VCC rating, Ioff support for live insertion, ±24 mA output drive at 3 V, and SOIC-20 package compatibility with legacy PCB layouts.
Technical Context
The SN74LVC245ADW implements a dual-bus, direction-controllable transceiver architecture with independent DIR and OE logic. Its CMOS design supports true bidirectional flow: when DIR = HIGH, data propagates A→B; when DIR = LOW, B→A. OE asserts high-impedance on both A and B ports simultaneously, isolating buses without leakage.
It integrates Ioff circuitry that disables outputs during partial power-down, preventing back-drive current when VCC = 0 V while inputs remain at 5.5 V. Input tolerance up to 5.5 V across all valid VCC (1.65–3.6 V) enables reliable level translation - e.g., 5-V microcontroller GPIO to 3.3-V FPGA interface - without external resistors or voltage shifters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - supports operation across 1.8-V, 2.5-V, and 3.3-V logic domains without level-shifter ICs |
| Input Voltage Tolerance | Up to 5.5 V - allows direct connection to 5-V systems while powered from 3.3-V or lower rails |
| Max Propagation Delay | 6.3 ns at 3.3 V, CL = 50 pF - ensures timing compliance in high-speed bus interfaces up to ~80 MHz |
| Output Drive Strength | ±24 mA at VCC = 3 V - sufficient to drive multiple LVC loads or moderate PCB trace capacitance |
| Ioff Current | ±10 μA at VI/VO = 5.5 V, VCC = 0 V - guarantees safe hot-plug operation and prevents back-current damage |
| ESD Rating | 2000 V HBM, 1000 V CDM - meets industrial-grade robustness requirements for board-level handling |
| Operating Temperature | –40°C to +125°C - qualified for extended-temperature industrial and automotive under-hood applications |
Pinout & Package
SN74LVC245ADW uses a 20-pin SOIC (DW) package with 12.80 mm × 7.50 mm body size, standard JEDEC MS-013 footprint, and gull-wing leads compatible with wave and reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction Control Input | High = A→B data flow; Low = B→A; determines signal path polarity for all 8 channels |
| 2–9 (A1–A8) | Port A I/O | Bidirectional data pins connected to source bus (e.g., microcontroller side); tolerate 5.5 V regardless of VCC |
| 10 (GND) | Ground Reference | Primary return path for all I/O and internal logic; must be low-impedance for noise immunity |
| 11–18 (B1–B8) | Port B I/O | Bidirectional data pins connected to destination bus (e.g., peripheral side); identical electrical specs to A port |
| 19 (OE) | Output Enable Input | Active-low control: OE = LOW enables transceiver; OE = HIGH places both A and B ports in high-Z state |
| 20 (VCC) | Power Supply | Single supply input for core logic and I/O buffers; bypass capacitor required per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | Enables 5-V inputs to interface with 3.3-V or 1.8-V VCC rails - eliminates need for discrete translators in heterogeneous systems |
| Ioff partial-power-down protection | Prevents damaging current flow when VCC is off but system signals remain active - critical for hot-swap I/O modules |
| Low ground bounce (VOLP < 0.8 V) | Reduces switching noise coupling into shared ground planes - improves signal integrity in dense digital layouts |
| High noise immunity (VIH/VIL margins) | Guarantees clean logic thresholds across full VCC range (e.g., VIH ≥ 2.0 V at 3.3 V) - enhances reliability in noisy industrial environments |
| Latch-up immunity > 250 mA | Meets JESD17 requirement - protects against destructive latch-up events caused by transient overvoltage or ESD |
Applications
| Industrial I/O Expansion | LED Display Driver Interface |
|---|---|
|
Use Scenario: Microcontroller GPIO expansion via parallel bus to drive 8-channel relay or sensor interface cards. IC Role / Device Role / Timing Role: Bidirectional data bridge between MCU's 3.3-V GPIO bank and 5-V industrial peripherals. Use Value: Eliminates external level shifters; Ioff enables safe firmware updates while field devices remain powered. |
Use Scenario: Driving multiplexed 7-segment or dot-matrix LED panels requiring high-current sink/source capability. IC Role / Device Role / Timing Role: Output buffer and voltage translator between low-voltage controller and 5-V LED column drivers. Use Value: ±24 mA drive strength directly sources/sinks LED segments; 6.3 ns tpd supports >10 kHz refresh rates. |
| Network Switch Backplane Interface | Motor Control Logic Isolation |
|
Use Scenario: Isolating management CPU bus from switch ASIC configuration registers during hot-reload operations. IC Role / Device Role / Timing Role: Bus isolation gate controlled by OE to decouple CPU and ASIC during firmware upgrades. Use Value: High-Z state prevents bus contention; 5.5-V input tolerance accommodates ASIC-side pull-ups without clamping diodes. |
Use Scenario: Interfacing microcontroller PWM outputs to H-bridge gate drivers operating at higher supply voltages. IC Role / Device Role / Timing Role: Level-translating and buffering control signals (EN, DIR, FAULT) between 3.3-V MCU and 12-V motor driver ICs. Use Value: 5.5-V input tolerance accepts 12-V open-drain fault signals via pull-up; DIR pin simplifies forward/reverse logic routing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVCH245A | Includes bus-hold circuitry on all I/O pins; otherwise identical VCC range, speed, and pinout | Eliminates external pull-up/down resistors on unused or floating bus lines - reduces BOM count in sparse I/O designs | Select when bus stability with un-driven lines is required; verify layout compatibility with same SOIC-20 footprint |
| 74LVC245PW | TSSOP-20 package (6.50 mm × 4.40 mm); identical electrical specs and logic function | Enables higher-density PCB layouts where SOIC real estate is constrained - no change to schematic or firmware | Select for space-constrained applications; confirm thermal performance meets requirements under same load conditions |
Compared with SN74LVC245ADW, SN74LVCH245A adds bus-hold for floating-line resilience but increases quiescent current slightly, while 74LVC245PW offers identical functionality in a smaller TSSOP package - both require no schematic changes but differ in mechanical integration and thermal behavior.
Availability
SN74LVC245ADW is available at Aetrix Electronics and suitable for industrial I/O expanders, LED display controllers, network switch backplanes, and motor control logic isolation requiring stable component supply across extended temperature ranges.
Supply support for SN74LVC245ADW 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 50 years of innovation in industrial and automotive electronics.
The SN74LVC245A product line delivers robust, low-voltage CMOS transceivers optimized for mixed-signal interfacing in space- and power-constrained industrial control systems.
FAQ
What is the maximum operating voltage for SN74LVC245ADW inputs?
The SN74LVC245ADW inputs accept voltages up to 5.5 V regardless of VCC level (1.65–3.6 V), enabling direct interfacing with 5-V logic families without external level-shifting components. This specification is guaranteed across the full –40°C to +125°C temperature range and is validated per TI's recommended operating conditions table.
Does SN74LVC245ADW support hot-plug or live-insertion applications?
Yes, SN74LVC245ADW supports live insertion via its Ioff feature: when VCC = 0 V, the outputs are disabled and leakage current is limited to ±10 μA even with 5.5-V signals applied. This prevents back-drive current and protects upstream circuitry during hot-swap events in modular I/O systems.
What is the propagation delay of SN74LVC245ADW at 3.3 V?
The maximum propagation delay (tpd) of SN74LVC245ADW is 6.3 ns at VCC = 3.3 V ± 0.3 V, CL = 50 pF, and TA = 25°C. This value applies to both A→B and B→A directions and is measured under standard load conditions defined in TI's switching characteristics test setup.
Can SN74LVC245ADW be used for level translation between 5-V and 1.8-V systems?
Yes, SN74LVC245ADW supports down-translation from 5-V inputs to 1.8-V VCC operation. Its inputs tolerate 5.5 V, and output VOH/VOL levels meet LVC specifications at 1.8 V (e.g., VOH ≥ 1.29 V at IOH = –100 μA), making it suitable for bridging legacy 5-V peripherals to modern low-voltage controllers.
What package type is used for SN74LVC245ADW?
SN74LVC245ADW uses a 20-pin SOIC (DW) package with dimensions 12.80 mm × 7.50 mm, standard gull-wing leads, and JEDEC MS-013 outline. It is supplied in tube packaging (25 units per tube) and is RoHS-compliant with NiPdAu lead finish and MSL Level-1 rating.
SN74LVC245ADW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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:
- 24mA, 24mA
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74LVC245ADW FAQ
1.How can I place an order for SN74LVC245ADW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC245ADW 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 SN74LVC245ADW reliable?
The price and inventory of SN74LVC245ADW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC245ADW is usually 5 days.
3.What payment methods are accepted for SN74LVC245ADW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC245ADW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC245ADW?
SN74LVC245ADW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC245ADW 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 SN74LVC245ADW?
For technical support, including SN74LVC245ADW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC245ADW requirements.
6.How does Aetrix verify that SN74LVC245ADW is sourced from the original manufacturer or authorized distributors?
All SN74LVC245ADW 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 SN74LVC245ADW meets industry standards.
7.What is the process for return or replacement of SN74LVC245ADW?
All SN74LVC245ADW units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC245ADW, 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 SN74LVC245ADW part is unused and in its original packaging.
Return procedure for SN74LVC245ADW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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