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Texas Instruments SN74LVC4245ADW
- Part No.:
- SN74LVC4245ADW
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74LVC4245ADW.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:6,660
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Product details
Overview
SN74LVC4245ADW from Texas Instruments is an octal 3.3V-to-5V bidirectional bus transceiver with 3-state outputs, dual-supply operation (VCCA = 4.5–5.5V, VCCB = 2.7–3.6V), 24mA drive strength at 3V, and glitch-free power sequencing - used in industrial PLCs, servo drive modules, and UPS systems for voltage-level translation between mixed-voltage data buses.
For engineers reviewing the SN74LVC4245ADW datasheet, SN74LVC4245ADW pinout, SN74LVC4245ADW application, or SN74LVC4245ADW equivalent, key selection criteria include its VCC isolation feature, Ioff partial-power-down support, 6.1–6.7ns propagation delay, ±2μA off-state leakage, and SOIC-24 package compatibility with legacy '245 layouts.
Technical Context
The SN74LVC4245ADW implements asynchronous bidirectional data flow controlled by DIR and OE inputs referenced to VCCA, enabling A↔B port translation without clocking. Its dual-rail architecture supports independent 5V and 3.3V domains while maintaining CMOS logic thresholds on both sides.
Glitch-free power sequencing ensures no spurious output transitions during VCCA/VCCB ramp-up/down sequences, and VCC isolation forces high-impedance I/O states when either supply drops below 100mV - critical for hot-swap and partial-power-down systems requiring robust fault containment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA Range | 4.5V to 5.5V - powers A-port I/O and control logic (DIR/OE), enabling direct interface with 5V microcontrollers or FPGAs. |
| VCCB Range | 2.7V to 3.6V - powers B-port I/O, supporting 3.3V logic families including LVC, LV, and ALVC without level-shifting circuitry. |
| Drive Strength | 24mA at 3V - sustains signal integrity across longer PCB traces or heavier capacitive loads (e.g., multi-drop bus configurations). |
| Propagation Delay | 6.1–6.7ns - enables reliable operation in high-speed digital interfaces up to ~100MHz with 50pF load. |
| Ioff Leakage | ±2μA max - prevents back-current flow during power-down, protecting powered-down subsystems in partial-power-down architectures. |
| ESD Rating | 2000V HBM - meets industrial-grade ESD immunity requirements without external protection components. |
| Operating Temp | –40°C to +85°C - qualified for extended-temperature industrial environments including motor drives and outdoor power electronics. |
Pinout & Package
SN74LVC4245ADW uses a 24-pin SOIC (DW) package measuring 15.5mm × 10.3mm, with standard 1.27mm pitch and gull-wing leads compatible with automated SMT assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA (Pin 1) | Power supply for A port and control logic | Must be stable 4.5–5.5V; supplies DIR, OE, and A1–A8 I/O buffers - defines VIH/VIL thresholds for control inputs. |
| DIR (Pin 2) | Direction control input | High = A→B data flow; Low = B→A data flow; referenced to VCCA, enabling 5V-compatible direction signaling. |
| A1–A8 (Pins 3–10) | Transceiver I/O pins (A side) | Bidirectional 5V-tolerant ports; driven by VCCA; support 24mA sink/source when enabled. |
| GND (Pins 11–13) | Ground reference | Three dedicated ground pins minimize ground bounce and improve noise immunity in high-drive operation. |
| B8–B1 (Pins 14–21) | Transceiver I/O pins (B side) | Bidirectional 3.3V ports powered by VCCB; electrically isolated from A-side supply domain. |
| OE (Pin 22) | Output enable input | Active-low; when high, all I/Os enter high-impedance state - enables bus isolation without power cycling. |
| VCCB (Pins 23–24) | Power supply for B port | Dual VCCB pins reduce IR drop and improve decoupling for B-side I/Os; must be 2.7–3.6V. |
Key Features
| Feature | Design Value |
|---|---|
| 3.3V ↔ 5V bidirectional translation | Enables seamless interconnection between legacy 5V controllers and modern 3.3V peripherals without external translators. |
| VCC isolation | Automatically disables all I/Os into high-Z when either VCCA or VCCB falls below 100mV - prevents bus contention during supply faults. |
| Ioff partial-power-down support | Blocks current backflow from live bus to unpowered domain, allowing safe hot-plug operation in modular systems. |
| Glitch-free power sequencing | Eliminates false data pulses during asymmetric VCCA/VCCB ramp-up/down - avoids unintended peripheral resets or configuration errors. |
| Pinout alignment with SN74LVC4245 | Pins 2–11 and 14–23 match conventional 20-pin '245 layout, enabling drop-in replacement without PCB redesign. |
Applications
| PLC & DCS Backplane Interface | Servo Drive Power Stage Control |
|---|---|
Use Scenario: Interfacing 5V FPGA-based motion controller with 3.3V encoder feedback and analog-to-digital acquisition modules in a compact servo drive chassis. IC Role / Device Role / Timing Role: Bidirectional voltage translator managing command signals (5V→3.3V) and position feedback (3.3V→5V) across isolated power domains. Use Value: Eliminates discrete level-shifter ICs and reduces BOM count while maintaining sub-7ns timing margins for real-time closed-loop response. | Use Scenario: Isolating gate driver logic (3.3V) from main controller (5V) in three-phase IGBT inverter stages of industrial servo amplifiers. IC Role / Device Role / Timing Role: Direction-controlled transceiver routing PWM enable/disable and fault status signals between voltage domains with deterministic latency. Use Value: Prevents latch-up during power sequencing faults and supports hot-swap maintenance via Ioff and VCC isolation features. |
| String Inverter Communication Module | Air Conditioner Outdoor Unit Control |
Use Scenario: Enabling RS-485 or CAN physical layer transceivers (3.3V) to communicate with 5V MCU host in photovoltaic string inverters operating at –40°C to +85°C. IC Role / Device Role / Timing Role: Voltage-level translator for bidirectional UART or SPI lines between MCU and communication PHY, with robust ESD protection. Use Value: Meets 2000V HBM ESD requirement for outdoor deployment and maintains signal fidelity over long internal harnesses using 24mA drive capability. | Use Scenario: Connecting 5V HVAC system controller to 3.3V sensor array (temperature, humidity, pressure) and fan motor drivers in air conditioner outdoor units. IC Role / Device Role / Timing Role: Transceiver handling sensor readouts and actuator commands across mixed-voltage subsystems with thermal stability. Use Value: Guarantees reliable operation across full industrial temperature range and eliminates need for external pull-ups or level-shift resistors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC4245APW | TSSOP-24 package (7.8mm × 6.4mm); 100.6°C/W RθJA vs 90.7°C/W for DW; identical electrical specs. | Better suited for space-constrained designs; slightly higher thermal resistance requires tighter thermal management. | Select SN74LVC4245APW when board area is limited and thermal margin allows TSSOP footprint. |
| TXB0304RUT | 4-bit auto-direction sensing; no DIR pin; 3.6V max VCCB; lower drive (±8mA); different pinout and control architecture. | Used where direction is data-dependent rather than externally controlled; not suitable for synchronous bidirectional protocols requiring explicit DIR control. | Choose TXB0304RUT only for simple 4-bit I²C or GPIO translation; avoid for '245-style parallel bus applications requiring DIR/OE control. |
Compared with SN74LVC4245APW and TXB0304RUT, the SN74LVC4245ADW provides deterministic direction control, higher drive strength, and SOIC-24 mechanical compatibility with legacy designs - making it optimal for industrial backplane and motor control interfaces requiring proven reliability and layout reuse.
Availability
SN74LVC4245ADW is available at Aetrix Electronics and suitable for industrial automation, motor control, and renewable energy systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for SN74LVC4245ADW 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The SN74LVC4245ADW belongs to TI's LVC logic family, engineered specifically for robust voltage translation in mixed-supply industrial systems - emphasizing power sequencing resilience, partial-power-down safety, and interoperability with legacy 5V infrastructure.
FAQ
What is the maximum allowable voltage on the B port of SN74LVC4245ADW?
The B port of SN74LVC4245ADW is rated for VCCB = 2.7V to 3.6V, with absolute maximum input voltage limited to VCCB + 0.5V (max 4.6V). Exceeding this risks permanent damage per Absolute Maximum Ratings Section 5.2. The SN74LVC4245ADW does not support 5V-tolerant B-side inputs - applying 5V directly to B1–B8 violates specifications and may degrade reliability.
Does SN74LVC4245ADW support hot-swap operation in partially powered systems?
Yes, SN74LVC4245ADW supports hot-swap via its Ioff and VCC isolation features. When VCCA or VCCB drops below 100mV, all I/Os enter high-impedance state, and Ioff limits power-off leakage to ±2μA - preventing back-current flow from live buses into unpowered sections. This behavior is verified in Sections 7.5 and 5.7–5.8 of the SN74LVC4245ADW datasheet.
Can SN74LVC4245ADW replace SN74LVC4245 in existing SOIC-20 designs without PCB changes?
No - SN74LVC4245ADW is a 24-pin SOIC device, while SN74LVC4245 is 20-pin. However, SN74LVC4245ADW's pin mapping (Pins 2–11 and 14–23) aligns with the functional I/Os of the 20-pin '245, enabling migration with minimal layout revision - unused pins (11–13 GND, 23–24 VCCB) require connection, not removal.
What is the propagation delay variation between A→B and B→A directions in SN74LVC4245ADW?
Per Section 5.9, SN74LVC4245ADW exhibits tPHL/tPLH = 6.1–6.3ns (B→A) and 6.3–6.7ns (A→B) under CL = 50pF. The asymmetry arises from differing output stage drive characteristics between VCCA- and VCCB-powered paths. This <0.6ns difference is negligible for most synchronous bus applications but must be accounted for in ultra-low-latency timing-critical designs.
How does SN74LVC4245ADW handle power supply sequencing during system startup?
SN74LVC4245ADW guarantees glitch-free operation regardless of VCCA/VCCB ramp order - documented in Section 7.4. If VCCA powers up before VCCB, outputs remain high-impedance until VCCB reaches valid operating range; if VCCB rises first, outputs stay disabled until VCCA stabilizes. This eliminates false data pulses that could trigger unintended peripheral resets - a key advantage over non-sequencing-aware translators.
SN74LVC4245ADW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- Packaging:
- Tube
- Product Status:
- Active
- Translator Type:
- Voltage Level
- Channel Type:
- Bidirectional
- Number of Circuits:
- 1
- Channels per Circuit:
- 8
- Voltage - VCCA:
- 4.5 V ~ 5.5 V
- Voltage - VCCB:
- 2.7 V ~ 3.6 V
- Input Signal:
- -
- Output Signal:
- -
- Output Type:
- Tri-State
- Data Rate:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC (0.295", 7.50mm Width)
SN74LVC4245ADW FAQ
1.How can I place an order for SN74LVC4245ADW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC4245ADW 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 SN74LVC4245ADW reliable?
The price and inventory of SN74LVC4245ADW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC4245ADW is usually 5 days.
3.What payment methods are accepted for SN74LVC4245ADW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC4245ADW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC4245ADW?
SN74LVC4245ADW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC4245ADW 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 SN74LVC4245ADW?
For technical support, including SN74LVC4245ADW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC4245ADW requirements.
6.How does Aetrix verify that SN74LVC4245ADW is sourced from the original manufacturer or authorized distributors?
All SN74LVC4245ADW 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 SN74LVC4245ADW meets industry standards.
7.What is the process for return or replacement of SN74LVC4245ADW?
All SN74LVC4245ADW units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC4245ADW, 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 SN74LVC4245ADW part is unused and in its original packaging.
Return procedure for SN74LVC4245ADW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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