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Texas Instruments SN74LVC4245APWRE4
- Part No.:
- SN74LVC4245APWRE4
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74LVC4245APWRE4.pdf
- Description:
- IC TRANSLATOR BIDIR 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:140
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Product details
Overview
SN74LVC4245APWRE4 from Texas Instruments is an octal 3.3V-to-5V bidirectional bus transceiver with 3-state outputs, VCCA/VCCB dual-supply architecture (5.5V/3.6V), 24mA drive strength at 3V, glitch-free power sequencing, and VCC isolation. It enables reliable level translation in industrial motor control interfaces and PLC backplane interconnects.
For engineers reviewing the SN74LVC4245APWRE4 datasheet, SN74LVC4245APWRE4 pinout, SN74LVC4245APWRE4 application, or SN74LVC4245APWRE4 equivalent, key selection criteria include dual-rail voltage tolerance (2.7–3.6V B-port / 4.5–5.5V A-port), Ioff partial-power-down support, high-impedance fail-safe behavior under VCC disconnect, and 6.1–6.7ns propagation delay across 8 channels.
Technical Context
The SN74LVC4245APWRE4 implements asynchronous bidirectional data flow controlled by DIR and OE inputs referenced to VCCA. Its dual-supply design isolates logic thresholds per port: B-port VIH/VIL defined relative to VCCB (2.7–3.6V), A-port control inputs referenced to VCCA (4.5–5.5V), enabling robust 3.3V↔5V translation without external level shifters.
Glitch-free power sequencing ensures no spurious output transitions when either VCCA or VCCB powers up/down independently. The VCC isolation feature forces all I/Os into high-impedance if either supply drops below 100mV or floats, while Ioff limits backflow current during partial power-down-critical for hot-swap and modular system designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA Range | 4.5V to 5.5V - powers A-port I/Os and DIR/OE control logic; supports standard 5V TTL systems |
| VCCB Range | 2.7V to 3.6V - powers B-port I/Os; compatible with 3.3V LVTTL, LVCMOS, and microcontroller I/Os |
| Drive Strength | 24mA at 3V (B-port) / 24mA at 4.5V (A-port) - sustains signal integrity on long PCB traces or heavy capacitive loads |
| Propagation Delay | 6.1–6.7ns (CL = 50pF) - enables >100MHz bus operation with tight timing margins in real-time control loops |
| Operating Temp | –40°C to +85°C - qualified for industrial ambient environments including servo drives and outdoor HVAC units |
| Ioff Leakage | ±2μA max (VCC = 0V) - prevents damaging back-current during partial power-down in modular power systems |
| ESD Rating | 2000V HBM, 1000V CDM - meets industrial handling requirements without additional protection circuitry |
Pinout & Package
TSSOP-24 package (7.8mm × 6.4mm), lead-free, RoHS-compliant, moisture sensitivity level 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, VCCA | Power supply | 5V-side rail; powers A-port I/Os and DIR/OE control circuitry |
| 2, DIR | Direction control input | High = A→B data flow; Low = B→A; referenced to VCCA |
| 3–10, A1–A8 | Bidirectional I/O | A-port transceiver pins; tolerate 0–5.5V input, drive 5V logic levels |
| 11–13, GND | Ground | Three dedicated ground pins reduce ground bounce in high-speed switching |
| 14–21, B8–B1 | Bidirectional I/O | B-port transceiver pins; operate at 2.7–3.6V; accept 0–4.6V input |
| 22, OE | Output enable input | Active-low; disables all I/Os to high-impedance; referenced to VCCA |
| 23–24, VCCB | Power supply | 3.3V-side rail; powers B-port I/Os only; electrically isolated from VCCA |
Key Features
| Feature | Design Value |
|---|---|
| Dual-supply translation | Enables direct interface between 3.3V microcontrollers and 5V legacy peripherals without external resistors or translators |
| VCC isolation | Automatically places all I/Os in high-Z when either VCCA or VCCB falls below 100mV-prevents bus contention during hot-swap or brownout |
| Ioff partial-power-down | Blocks reverse current flow when VCC rails are unpowered, protecting downstream devices in modular power architectures |
| Glitch-free sequencing | Eliminates false data pulses during asymmetric power-up/down of VCCA and VCCB-avoids unintended peripheral resets in PLCs |
| 24-pin pinout compatibility | Shares pin mapping with standard SN74LVC4245 (pins 2–11 and 14–23), allowing drop-in replacement without PCB redesign |
Applications
| PLC Backplane Interface | Servo Drive Control Bus |
|---|---|
Use Scenario: Isolating 3.3V FPGA-based motion controller logic from 5V analog I/O modules and encoder interfaces in a programmable logic controller rack. IC Role / Device Role / Timing Role: Bidirectional level-shifting transceiver managing command/data exchange between voltage-domain-separated subsystems with deterministic 6.3ns latency. Use Value: Eliminates need for discrete level-shifters or optocouplers, reducing BOM count and board area while maintaining sub-10ns timing predictability. |
Use Scenario: Interfacing a 3.3V ARM Cortex-M7 MCU to 5V gate drivers and current-sense amplifiers in a three-phase servo motor power stage. IC Role / Device Role / Timing Role: Octal bus transceiver translating PWM enable signals, fault flags, and position feedback across voltage domains with simultaneous 8-bit parallel transfer. Use Value: Supports real-time closed-loop response with <7ns skew across all 8 lines, critical for synchronized gate drive timing in field-oriented control. |
| Outdoor HVAC Communication | String Inverter Data Concentrator |
Use Scenario: Linking 3.3V wireless communication modules (Wi-Fi/BLE) to 5V legacy HVAC control boards in air conditioner outdoor units operating at –40°C to +85°C. IC Role / Device Role / Timing Role: Voltage-translating bus buffer enabling UART/SPI communication between mixed-voltage subsystems with robust ESD immunity (2000V HBM). Use Value: Withstands harsh outdoor EMI and thermal cycling without signal corruption or latch-up, certified per JESD17 (>250mA latch-up immunity). |
Use Scenario: Aggregating sensor data and control commands from multiple 3.3V string-level monitoring ICs to a central 5V inverter controller in photovoltaic solar systems. IC Role / Device Role / Timing Role: High-drive (24mA) transceiver driving long PCB traces between distributed MPPT units and master controller under variable load conditions. Use Value: Maintains signal integrity over 15cm+ trace lengths without termination, reducing jitter-induced measurement errors in DC voltage/current sampling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional level-shifting transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TXB0108PWR | Auto-direction sensing (no DIR pin); 1.2–3.6V/1.65–5.5V dual-rail; lower drive (4mA) | Best for low-power, low-speed I²C/SPI where direction is predictable; unsuitable for high-current bus loading | Choose TXB0108PWR only if direction is unidirectional per transaction and drive <12mA suffices. |
| SN74AVC4T245RTER | Quad-channel (4-bit); 1.2–3.6V/1.65–3.6V rails; higher speed (2.9ns tPHL), but no 5V tolerance | Optimized for 3.3V↔1.8V/2.5V mobile interfaces; cannot interface to 5V systems | Use SN74AVC4T245RTER only in fully 3.3V-or-lower systems requiring sub-3ns latency and space-constrained layouts. |
Compared with TXB0108PWR and SN74AVC4T245RTER, SN74LVC4245APWRE4 uniquely supports true 3.3V↔5V translation with 24mA drive and failsafe VCC isolation-making it the sole choice for industrial 5V legacy integration where reliability under power fault conditions is mandatory.
Availability
SN74LVC4245APWRE4 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 TSSOP packaging.
Supply support for SN74LVC4245APWRE4 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 SN74LVC4245A belongs to TI's LVC logic family, engineered specifically for robust voltage-level translation in mixed-supply industrial control systems where interoperability between legacy 5V and modern 3.3V subsystems is required.
FAQ
What voltage ranges does the SN74LVC4245APWRE4 support on its A and B ports?
The SN74LVC4245APWRE4 supports 4.5V to 5.5V on the A port (VCCA) and 2.7V to 3.6V on the B port (VCCB). This allows bidirectional translation between standard 5V TTL and 3.3V LVTTL/LVCMOS systems. Inputs on the A port tolerate up to VCCA + 0.5V (max 6V), while B-port inputs tolerate up to VCCB + 0.5V (max 4.6V), ensuring safe interfacing with overvoltage-tolerant peripherals. These ranges are fully specified across –40°C to +85°C.
How does the VCC isolation feature work in the SN74LVC4245APWRE4?
The SN74LVC4245APWRE4 enters high-impedance state on all I/Os when either VCCA or VCCB drops below 100mV or is left floating. This prevents bus contention and back-driving during power sequencing faults, hot-swap events, or partial system shutdowns. The isolation is hardware-enforced and requires no external circuitry. When active, both A and B ports present >10⁹Ω impedance, verified per JESD78 leakage testing, making SN74LVC4245APWRE4 suitable for modular power architectures in PLCs and UPS systems.
Can the SN74LVC4245APWRE4 replace a standard SN74LVC4245 on the same PCB?
Yes-the SN74LVC4245APWRE4 uses identical pin numbering and placement for functional I/Os (pins 2–11 and 14–23) as the legacy SN74LVC4245, enabling drop-in replacement without layout changes. The extra VCCB pins (23–24) and duplicated GND pins (11–13) do not conflict with existing footprints. However, SN74LVC4245APWRE4 requires separate 3.3V and 5V supplies, whereas the original SN74LVC4245 operates from a single 3.3V rail-power delivery must be updated accordingly.
What is the maximum data rate supported by the SN74LVC4245APWRE4?
The SN74LVC4245APWRE4 supports data rates exceeding 100MHz, based on its 6.1–6.7ns propagation delay (tPHL/tPLH) under CL = 50pF load conditions. Real-world throughput depends on bus capacitance, trace length, and termination; with 15pF total load, edge rates support >150MHz clocked transfers. The device exhibits minimal skew (<0.5ns) across all 8 channels, making it suitable for synchronous parallel interfaces in servo drives and data concentrators where timing alignment is critical.
Does the SN74LVC4245APWRE4 support partial-power-down operation?
Yes-the SN74LVC4245APWRE4 includes Ioff circuitry that limits input/output leakage to ±2μA when either VCCA or VCCB is at 0V, preventing damaging reverse current flow into powered subsystems. This capability is tested per JESD78 and enables safe partial-power-down in modular systems such as string inverters or distributed I/O racks, where individual sections may be de-energized while others remain active. Ioff behavior is guaranteed across the full –40°C to +85°C temperature range.
SN74LVC4245APWRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Translator Type:
- -
- Channel Type:
- -
- Number of Circuits:
- -
- Channels per Circuit:
- -
- Voltage - VCCA:
- -
- Voltage - VCCB:
- -
- Input Signal:
- -
- Output Signal:
- -
- Output Type:
- -
- Data Rate:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP (0.173", 4.40mm Width)
SN74LVC4245APWRE4 FAQ
1.How can I place an order for SN74LVC4245APWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC4245APWRE4 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 SN74LVC4245APWRE4 reliable?
The price and inventory of SN74LVC4245APWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC4245APWRE4 is usually 5 days.
3.What payment methods are accepted for SN74LVC4245APWRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC4245APWRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC4245APWRE4?
SN74LVC4245APWRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC4245APWRE4 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 SN74LVC4245APWRE4?
For technical support, including SN74LVC4245APWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC4245APWRE4 requirements.
6.How does Aetrix verify that SN74LVC4245APWRE4 is sourced from the original manufacturer or authorized distributors?
All SN74LVC4245APWRE4 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 SN74LVC4245APWRE4 meets industry standards.
7.What is the process for return or replacement of SN74LVC4245APWRE4?
All SN74LVC4245APWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC4245APWRE4, 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 SN74LVC4245APWRE4 part is unused and in its original packaging.
Return procedure for SN74LVC4245APWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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