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Texas Instruments SN74LVCC4245APWRG4
- Part No.:
- SN74LVCC4245APWRG4
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74LVCC4245APWRG4.pdf
- Description:
- IC TRANSLATOR BIDIR 24TSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74LVCC4245APWRG4 from Texas Instruments is an octal dual-supply bus transceiver enabling bidirectional level translation between 5V (A port) and 3.3V–5.5V (B port) buses, with 24mA drive strength at 3V, robust glitch-free power sequencing, and VCC isolation. It serves in industrial motor control interfaces where mixed-voltage data exchange between microcontrollers and power-stage peripherals must remain deterministic during supply ramp-up or brownout.
For engineers reviewing the SN74LVCC4245APWRG4 datasheet, SN74LVCC4245APWRG4 pinout, SN74LVCC4245APWRG4 application, or SN74LVCC4245APWRG4 equivalent, key selection criteria include dual-rail voltage flexibility (VCCA = 4.5–5.5V, VCCB = 2.7–5.5V), Ioff-enabled partial power-down, high-impedance fail-safe behavior under sub-100mV VCC, and TSSOP-24 packaging for space-constrained PCB layouts.
Technical Context
The SN74LVCC4245APWRG4 implements asynchronous, direction-controlled bidirectional data flow using separate VCCA (5V domain) and VCCB (3.3V/5V configurable domain) rails. Its DIR input selects A→B or B→A transmission, while OE (referenced to VCCA) enables/disables all outputs into high-impedance state.
Glitch-free power sequencing ensures no spurious output transitions occur when either VCCA or VCCB powers up/down independently. The VCC isolation feature forces both A and B ports into high-Z if either supply drops below 100mV or floats - a critical safety mechanism for systems with independent power domains.
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), ensuring compatibility with legacy 5V logic subsystems. |
| VCCB Range | 2.7V to 5.5V - configures B-port output voltage level, enabling direct interface to 3.3V microcontrollers or 5V peripherals without external level shifters. |
| Drive Strength | ±24mA at 3V VCCB - supports driving heavier capacitive loads (e.g., long PCB traces or multiple gate inputs) without signal degradation. |
| Propagation Delay | 1ns to 7.4ns (CL = 50pF) - guarantees sub-10ns timing margins for high-speed bus handshaking in real-time control loops. |
| Ioff Leakage | ±2µA max - prevents damaging back-current flow when one supply is powered down, enabling safe hot-swap and partial-power-down operation. |
| ESD Rating | 2000V HBM, 1000V CDM - meets industrial-grade ESD immunity requirements for deployment in noisy factory environments. |
| Operating Temp | –40°C to +85°C - validated for use in outdoor power electronics such as air conditioner outdoor units and string inverters. |
Pinout & Package
TSSOP-24 package (9.7mm × 6.4mm), lead pitch 0.65mm, surface-mount, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA (Pin 1) | A-port supply rail | Powers A-side I/O buffers and DIR/OE control circuitry; must be stable before enabling device. |
| DIR (Pin 2) | Direction control input | High = A→B data flow; Low = B→A data flow; referenced to VCCA for consistent threshold behavior. |
| A1–A8 (Pins 3–10) | A-port bidirectional data lines | Connect to 5V bus; tolerate input voltages up to VCCA + 0.5V; support 24mA sink/source at 3V VCCB. |
| GND (Pins 11,12,13) | Ground reference | Three dedicated GND pins minimize ground bounce and improve noise immunity across all 8 channels. |
| B8–B1 (Pins 14–21) | B-port bidirectional data lines | Interface to 3.3V/5V bus; output voltage tracks VCCB; high-Z when OE active or VCCB <100mV. |
| OE (Pin 22) | Output enable (active-low) | Drives all A/B outputs to high-impedance when high; referenced to VCCA for reliable disable timing. |
| NC (Pin 23) | No-connect | Internally unconnected; must remain floating or grounded per layout guidelines - not used for routing. |
| VCCB (Pin 24) | B-port supply rail | Sets B-port output voltage level; enables seamless 3.3V↔5V translation without external components. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail voltage translation | Supports asymmetric operation: 5V A-port ↔ 3.3V/5V B-port, eliminating need for discrete level-shifting circuits. |
| VCC isolation | Automatically places both A and B ports in high-impedance state if either VCCA or VCCB falls below 100mV - prevents bus contention during supply faults. |
| Glitch-free sequencing | Allows VCCA and VCCB to power up/down in any order without generating false logic transitions on I/O lines. |
| 24mA drive at 3V | Enables reliable signal integrity over 10+ cm PCB traces or into 10+ TTL loads, reducing need for external buffers. |
| Ioff partial power-down | Blocks current backflow when powered down, protecting upstream drivers and meeting IEC 61000-4-2 system-level ESD compliance. |
Applications
| PLC Backplane Interface | Servo Drive Data Link |
|---|---|
Use Scenario: Isolating 5V CPU bus from 3.3V FPGA-based motion control logic in modular PLC chassis. IC Role / Device Role / Timing Role: Bidirectional level translator managing command/status exchange between main controller and servo axis modules. Use Value: Eliminates discrete resistor-divider or MOSFET-based translators, reducing BOM count and improving timing predictability across 8 parallel control signals. |
Use Scenario: Connecting 5V microcontroller SPI/parallel interface to 3.3V isolated gate driver ICs in servo power stage. IC Role / Device Role / Timing Role: Synchronous data bridge ensuring deterministic setup/hold timing between MCU and PWM modulator. Use Value: 24mA drive sustains signal integrity across 4-layer board routing to gate drivers, avoiding edge ringing that could trigger false switching. |
| String Inverter Communication | Air Conditioner Outdoor Unit Control |
Use Scenario: Interfacing 5V master controller to 3.3V monitoring ICs (voltage/current/temp sensors) in photovoltaic string inverters. IC Role / Device Role / Timing Role: Robust voltage translator operating across –40°C to +85°C ambient with fail-safe high-Z on supply loss. Use Value: VCC isolation prevents sensor bus corruption during DC-link capacitor discharge events, maintaining system diagnostics integrity. |
Use Scenario: Linking 5V HVAC system controller to 3.3V fan motor drivers and refrigerant valve actuators in outdoor condensing units. IC Role / Device Role / Timing Role: Level-shifting transceiver handling bidirectional status reporting and command execution in harsh thermal cycles. Use Value: Glitch-free sequencing tolerates independent 5V control rail and 3.3V actuator rail power cycling during compressor start-stop events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC4245APWR | Lacks VCC isolation and glitch-free sequencing; VCCB range limited to 3.0–3.6V only; no sub-100mV fail-safe behavior. | Suitable only for static 3.3V↔5V systems with tightly coupled, synchronized supplies - not for fault-tolerant industrial designs. | Select SN74LVC4245APWR only when cost is primary constraint and supply sequencing control is guaranteed by system architecture. |
| TXB0108PWR | Auto-direction sensing (no DIR pin); lower drive (±4mA); supports 1.2–3.6V to 1.65–5.5V translation; no Ioff or VCC isolation. | Better for low-power, low-pin-count applications like USB peripheral interfacing; unsuitable for high-drive, safety-critical bus isolation. | Choose TXB0108PWR for portable or battery-powered systems where automatic direction detection and ultra-low quiescent current outweigh drive and fault tolerance needs. |
Compared with SN74LVC4245APWR and TXB0108PWR, SN74LVCC4245APWRG4 uniquely delivers simultaneous 24mA drive, VCC isolation, and glitch-free sequencing - making it the only option qualified for industrial motor drives and grid-tied inverters requiring deterministic behavior under supply fault conditions.
Availability
SN74LVCC4245APWRG4 is available at Aetrix Electronics and suitable for industrial motor control, renewable energy inverters, and HVAC outdoor unit designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LVCC4245APWRG4 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 decades of experience delivering high-reliability components for industrial, automotive, and power systems.
The SN74LVCC4245A product line targets mixed-voltage digital interfacing in harsh-environment applications - specifically engineered to solve bus-level translation challenges in programmable logic controllers, servo drives, and distributed power electronics where supply sequencing and fault resilience are non-negotiable.
FAQ
What is the maximum allowable voltage difference between VCCA and VCCB for reliable operation of SN74LVCC4245APWRG4?
The SN74LVCC4245APWRG4 supports VCCA from 4.5V to 5.5V and VCCB from 2.7V to 5.5V, allowing up to 2.8V differential (e.g., VCCA = 4.5V, VCCB = 2.7V) without derating. Absolute maximum ratings permit VCCA and VCCB to differ by ≤6V, but functional operation is guaranteed only within the recommended ranges specified in the datasheet. Exceeding 2.8V differential may reduce noise margin or increase propagation delay variation.
Does SN74LVCC4245APWRG4 support hot-swap operation where VCCB is powered before VCCA?
Yes, SN74LVCC4245APWRG4 supports true hot-swap capability: either VCCA or VCCB may be powered first or last without causing glitches, latch-up, or damage. Its glitch-free power sequencing architecture ensures all I/Os remain in high-impedance until both supplies stabilize above 100mV, and its Ioff circuitry blocks back-current during partial power-down - a key requirement for field-replaceable module designs.
Can SN74LVCC4245APWRG4 translate between 5V and 1.8V logic levels?
No, SN74LVCC4245APWRG4 does not support 1.8V operation. Its VCCB minimum is 2.7V, and its input thresholds (VIHB, VILB) are designed for 2.7V–5.5V B-port signaling. Attempting to operate VCCB at 1.8V violates recommended conditions, risks undefined output states, and voids parametric guarantees. For 1.8V↔5V translation, consider TI's TXS0108E or similar auto-sensing translators.
How does the VCC isolation feature behave when VCCA is 0V and VCCB is 3.3V in SN74LVCC4245APWRG4?
When VCCA drops below 100mV (including 0V) while VCCB remains at 3.3V, the SN74LVCC4245APWRG4 forces both A-port and B-port I/Os into high-impedance state regardless of DIR or OE state. This isolates the 3.3V B-bus from the unpowered 5V domain, preventing current leakage, bus contention, or unintended activation of downstream 5V peripherals - a critical safeguard during controlled shutdown or supply fault scenarios.
Is SN74LVCC4245APWRG4 pin-compatible with SN74LVC4245APWR in TSSOP-24 packages?
Yes, SN74LVCC4245APWRG4 and SN74LVC4245APWR share identical TSSOP-24 pinout, footprint, and mechanical dimensions - enabling drop-in replacement on existing PCBs. However, SN74LVCC4245APWRG4 adds VCC isolation, wider VCCB range (2.7–5.5V vs. 3.0–3.6V), and enhanced sequencing robustness, so firmware and system-level validation are still required despite mechanical compatibility.
SN74LVCC4245APWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVCC
- Package/Case:
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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 ~ 5.5 V
- Input Signal:
- -
- Output Signal:
- -
- Output Type:
- Tri-State, Non-Inverted
- Data Rate:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP (0.173", 4.40mm Width)
SN74LVCC4245APWRG4 FAQ
1.How can I place an order for SN74LVCC4245APWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVCC4245APWRG4 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 SN74LVCC4245APWRG4 reliable?
The price and inventory of SN74LVCC4245APWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVCC4245APWRG4 is usually 5 days.
3.What payment methods are accepted for SN74LVCC4245APWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVCC4245APWRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVCC4245APWRG4?
SN74LVCC4245APWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVCC4245APWRG4 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 SN74LVCC4245APWRG4?
For technical support, including SN74LVCC4245APWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVCC4245APWRG4 requirements.
6.How does Aetrix verify that SN74LVCC4245APWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74LVCC4245APWRG4 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 SN74LVCC4245APWRG4 meets industry standards.
7.What is the process for return or replacement of SN74LVCC4245APWRG4?
All SN74LVCC4245APWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVCC4245APWRG4, 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 SN74LVCC4245APWRG4 part is unused and in its original packaging.
Return procedure for SN74LVCC4245APWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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