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Texas Instruments SN74LVC8T245DGVRG4
- Part No.:
- SN74LVC8T245DGVRG4
- Manufacturer:
- Texas Instruments
- Package:
- 24-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVC8T245DGVRG4.pdf
- Description:
- IC TRANSLATION TXRX 5.5V 24TVSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74LVC8T245 from Texas Instruments is an 8-bit dual-supply non-inverting bus transceiver enabling bidirectional voltage-level translation between 1.65V and 5.5V domains. It features independent VCCA (1.65–5.5V) and VCCB (1.65–5.5V) rails, 3-state outputs controlled by DIR and OE pins referenced to VCCA, and Ioff support for partial-power-down operation. It is used in mixed-voltage system interconnects such as 1.8V controller-to-5V peripheral interfaces.
For engineers reviewing the SN74LVC8T245 datasheet, SN74LVC8T245 pinout, SN74LVC8T245 application, or SN74LVC8T245 equivalent, key selection criteria include configurable dual-rail operation, glitch-free power sequencing, VCC isolation behavior, Ioff leakage specification (<±2 µA), and TVSOP-24 package compatibility with high-density PCB layouts.
Technical Context
The SN74LVC8T245 implements asynchronous bidirectional data flow using a direction-control (DIR) signal referenced to VCCA and an output-enable (OE) signal also referenced to VCCA. Its dual-rail architecture allows simultaneous operation of A-port I/Os at VCCA and B-port I/Os at VCCB, supporting translation between any pair within 1.65V–5.5V (e.g., 1.8V↔3.3V, 2.5V↔5V). The device maintains high-impedance outputs when either VCC falls below 100 mV or is floating.
Logic thresholds for DIR and OE are dynamically scaled to VCCA, ensuring robust control across supply voltages. Input circuits remain active regardless of OE state, requiring all unused I/Os to be tied HIGH or LOW to prevent excess ICC and ICCZ. Propagation delays range from 0.3 ns (tPZH at 5V→5V) to 29.6 ns (tPHZ at 1.8V→1.8V), with output drive strength scaling from ±4 mA (1.65V) to ±32 mA (5V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA / VCCB Range | 1.65V to 5.5V - enables universal level translation between 1.8V, 2.5V, 3.3V, and 5V logic domains without external biasing |
| Max Output Drive | ±32 mA at 5V - supports driving heavier capacitive loads or parallel outputs without external buffers |
| Ioff Leakage | ±2 µA max - prevents backflow current during partial power-down, protecting powered-down subsystems |
| Propagation Delay | 0.3–29.6 ns - varies with VCCA/VCCB combination; critical for timing closure in high-speed interconnects up to ~50 MHz |
| ESD Rating | ±4000V HBM, ±1000V CDM - meets industrial handling requirements without additional protection circuitry |
| Operating Temperature | –40°C to +85°C - qualified for commercial and extended industrial environments |
| Supply Sequencing | Glitch-free - allows VCCA and VCCB to power up/down in any order without spurious output transitions |
Pinout & Package
SN74LVC8T245DGVRG4 is packaged in a 24-pin TVSOP (DGV) measuring 5.0 mm × 6.4 mm with 0.4 mm pitch, optimized for space-constrained PCB layouts while maintaining thermal performance (RθJA = 91.1°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA (Pin 1) | Power supply for A port and control inputs | Supplies A-side I/Os and DIR/OE logic; VIH/VIL thresholds scale with this rail |
| DIR (Pin 2) | Direction control input | High = A→B data flow; Low = B→A; referenced to VCCA |
| A1–A8 (Pins 3–10) | A-port bidirectional I/Os | Track VCCA; must be driven HIGH/LOW when unused to avoid leakage and noise coupling |
| GND (Pins 11–13) | Ground reference | Three dedicated GND pins reduce ground bounce and improve noise immunity |
| B8–B1 (Pins 14–21) | B-port bidirectional I/Os | Track VCCB; electrically isolated from A port except through transceiver logic |
| OE (Pin 22) | Output enable input | High = all outputs high-impedance; referenced to VCCA; tie to VCCA via pullup for safe power-up |
| VCCB (Pins 23–24) | Power supply for B port | Supplies B-side I/Os only; independent of VCCA for true dual-rail operation |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail voltage translation | Enables interoperability between 1.65V–5.5V logic families on same board without level-shifter ICs or discrete solutions |
| VCC isolation | Automatically places all I/Os in high-impedance state if either VCCA or VCCB drops below 100 mV or floats - prevents bus contention during brownout |
| Ioff partial-power-down | Blocks current backflow into powered-down ports, allowing hot-swap or selective subsystem shutdown without affecting other rails |
| Glitch-free sequencing | Eliminates false data pulses during asymmetric power-up/down sequences - avoids unintended peripheral resets or configuration errors |
| Robust ESD protection | Meets JESD22-A114 (4 kV HBM) and JESD22-C101 (1 kV CDM), reducing need for external TVS diodes in end equipment |
Applications
| Industrial PLC Backplane Interface | Consumer Soundbar I²C Expansion |
|---|---|
Use Scenario: Interfacing a 3.3V ARM-based motion controller with legacy 5V I/O modules over a shared backplane bus. IC Role / Device Role / Timing Role: Bidirectional voltage translator isolating 3.3V control logic from 5V field I/O while preserving signal integrity and timing margins. Use Value: Eliminates need for discrete MOSFET translators or dual-supply buffers; supports full 8-bit parallel data transfer at >20 MHz with sub-30 ns propagation delay. |
Use Scenario: Expanding I²C address space in a 1.8V SoC-based soundbar by adding 3.3V audio codec peripherals. IC Role / Device Role / Timing Role: Level-shifting I²C SDA/SCL lines and GPIOs between 1.8V master and 3.3V slave devices with minimal added capacitance. Use Value: Maintains I²C timing compliance (rise/fall times < 1 µs) due to low Cio (≤10 pF) and fast enable/disable (tPZH ≤ 10.9 ns), avoiding bus lockup. |
| Network-Attached Storage SATA Bridge | Flat-Panel Monitor Timing Controller Link |
Use Scenario: Bridging 1.8V NVMe SSD interface signals to a 3.3V SATA host controller in embedded NAS hardware. IC Role / Device Role / Timing Role: Translating command/status/control lines (not high-speed data lanes) with precise direction control and glitch immunity. Use Value: Ensures reliable handshaking during hot-plug events via VCC isolation and Ioff - prevents latch-up or data corruption during power transitions. |
Use Scenario: Connecting a 2.5V display timing controller (TCON) to 5V source driver ICs in LCD panel assemblies. IC Role / Device Role / Timing Role: Translating 8-bit parallel LVDS or TTL timing signals (e.g., DE, HS, VS, CLK) with matched propagation delay across all channels. Use Value: Delivers channel-to-channel skew < 1 ns (per datasheet switching specs), preserving pixel clock alignment and eliminating image tearing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVC8T245RHLR | Lower VCC range (1.2V–3.6V); higher speed (tPLH down to 0.25 ns); VQFN-24 package | Optimized for sub-1.8V systems (e.g., mobile APs); not suitable for 5V domains | Select when interfacing 1.2V/1.5V/1.8V logic only; avoid for 3.3V↔5V translation |
| TXB0108PWR | Auto-direction sensing (no DIR pin); supports 1.2V–3.6V rails; higher Ioff (±5 µA) | Eliminates direction-control wiring but adds latency (~20 ns) and limits max frequency to ~20 MHz | Choose for simple point-to-point I²C/SPI links where DIR routing is impractical; not for high-speed parallel buses |
Compared with SN74LVC8T245DGVRG4, SN74AVC8T245RHLR offers faster switching in low-voltage domains but lacks 5V tolerance, while TXB0108PWR simplifies control logic at the cost of deterministic timing and voltage range - making SN74LVC8T245DGVRG4 optimal for mixed 1.8V/3.3V/5V parallel bus translation requiring precise direction control and robust sequencing.
Availability
SN74LVC8T245DGVRG4 is available at Aetrix Electronics and suitable for industrial PLC backplanes, consumer audio expansion interfaces, network-attached storage bridges, and flat-panel monitor timing controller links requiring stable component supply and long-term manufacturability.
Supply support for SN74LVC8T245DGVRG4 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 and embedded processing solutions, with over 90 years of innovation in precision analog, power management, and interface technologies.
The SN74LVC8T245 belongs to TI's LVC logic family designed for low-voltage, high-speed, mixed-supply system interconnects - specifically targeting voltage translation in industrial automation, computing infrastructure, and consumer electronics where reliability and sequencing robustness are critical.
FAQ
What is the maximum allowable voltage difference between VCCA and VCCB for reliable operation of SN74LVC8T245DGVRG4?
The SN74LVC8T245DGVRG4 supports any combination of VCCA and VCCB within 1.65V to 5.5V independently - including 1.65V/5.5V, 3.3V/1.8V, or 5V/2.5V. No maximum differential is specified; the device is characterized for full rail-to-rail translation across its entire operating range per TI SCES584D.
Can SN74LVC8T245DGVRG4 be used to translate between 1.2V and 3.3V logic levels?
No - SN74LVC8T245DGVRG4 has a minimum VCCA and VCCB rating of 1.65V. For 1.2V domain translation, TI recommends the SN74AXC8T245 or TXU0108, which are explicitly rated down to 0.66V and 1.08V respectively. Using SN74LVC8T245DGVRG4 below 1.65V violates recommended operating conditions and risks functional failure.
How does the VCC isolation feature behave when VCCA is powered but VCCB is disconnected?
When VCCB falls below 100 mV or floats while VCCA remains powered, the SN74LVC8T245DGVRG4 disables all B-port outputs and forces them into high-impedance state. A-port I/Os remain active but cannot drive B-side signals - preventing bus contention and backfeed current into the unpowered VCCB rail.
Is SN74LVC8T245DGVRG4 pin-compatible with other 24-pin TVSOP bus transceivers like SN74LVC16T245?
No - SN74LVC8T245DGVRG4 is an 8-bit device in 24-pin TVSOP, whereas SN74LVC16T245 is a 16-bit transceiver requiring 48-pin packages (e.g., DL, DGG). Pin count, signal mapping, and power pin allocation differ fundamentally; direct PCB replacement is not possible without layout revision.
What is the recommended pullup resistor value for OE when using SN74LVC8T245DGVRG4 in a system with slow power ramp rates?
Texas Instruments recommends tying OE to VCCA through a pullup resistor to ensure high-impedance state during power-up. The minimum value depends on the driver's sink capability; for standard CMOS drivers, 10 kΩ is typical. Lower values (e.g., 4.7 kΩ) improve noise immunity but increase static current - verify against the driver's IOL spec per SCES584D Section 7.4.
SN74LVC8T245DGVRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 24-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Logic Type:
- Translation Transceiver
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 32mA, 32mA
- Voltage - Supply:
- 1.65V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TVSOP
SN74LVC8T245DGVRG4 FAQ
1.How can I place an order for SN74LVC8T245DGVRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC8T245DGVRG4 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 SN74LVC8T245DGVRG4 reliable?
The price and inventory of SN74LVC8T245DGVRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC8T245DGVRG4 is usually 5 days.
3.What payment methods are accepted for SN74LVC8T245DGVRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC8T245DGVRG4 transactions.
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SN74LVC8T245DGVRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC8T245DGVRG4 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 SN74LVC8T245DGVRG4?
For technical support, including SN74LVC8T245DGVRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC8T245DGVRG4 requirements.
6.How does Aetrix verify that SN74LVC8T245DGVRG4 is sourced from the original manufacturer or authorized distributors?
All SN74LVC8T245DGVRG4 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 SN74LVC8T245DGVRG4 meets industry standards.
7.What is the process for return or replacement of SN74LVC8T245DGVRG4?
All SN74LVC8T245DGVRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC8T245DGVRG4, 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 SN74LVC8T245DGVRG4 part is unused and in its original packaging.
Return procedure for SN74LVC8T245DGVRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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