My Inquiry
My Account
Texas Instruments SN74LVC8T245PWRG4
- Part No.:
- SN74LVC8T245PWRG4
- Manufacturer:
- Texas Instruments
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVC8T245PWRG4.pdf
- Description:
- IC TRANSLATION TXRX 5.5V 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,294
Please send an inquiry. Send us your inquiry, and we will respond immediately.
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 and VCCB 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 in industrial PLCs and flat-panel monitors.
For engineers reviewing the SN74LVC8T245 datasheet, SN74LVC8T245 pinout, SN74LVC8T245 application, or SN74LVC8T245 equivalent, key selection criteria include configurable dual-rail operation (1.65V–5.5V), glitch-free power sequencing, VCC isolation behavior, Ioff leakage specification (<±2 µA), and TSSOP-24 package compatibility with standard PCB layout practices.
Technical Context
The SN74LVC8T245 implements asynchronous bidirectional data flow via DIR-controlled direction switching and OE-gated 3-state output enable/disable. Its input circuitry remains active regardless of OE state, requiring all A/B port pins to be held at valid logic levels to prevent excess ICC and ICCZ. Control inputs (DIR, OE) are referenced solely to VCCA, decoupling control logic from B-port supply conditions.
It supports true dual-rail translation - A-port I/Os track VCCA (1.65V–5.5V), B-port I/Os track VCCB (1.65V–5.5V) - enabling interoperability across 1.8V/2.5V/3.3V/5V nodes without external level-shifting components. The VCC isolation feature forces both ports into high-impedance when either VCCA or VCCB drops below 100 mV or floats, preventing backdrive during power sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA / VCCB Range | 1.65V to 5.5V each - enables translation between any common low-voltage logic families (1.8V ↔ 2.5V ↔ 3.3V ↔ 5V) without external biasing. |
| IOH / IOL Drive | ±32 mA at 5V - sufficient to drive standard CMOS loads and multiple fanouts; balanced push-pull outputs ensure fast edge rates into light capacitive loads. |
| tPLH / tPHL Max | 23.8 ns (A→B, VCCA=1.8V/VCCB=2.5V) - supports reliable data transfer up to ~20 MHz in typical mixed-voltage configurations. |
| Ioff Leakage | ±2 µA max - ensures safe partial-power-down operation by blocking current backflow when one supply is off while the other remains active. |
| ESD Rating | ±4000 V HBM, ±1000 V CDM - meets industrial-grade robustness requirements for handling and board-level reliability. |
| Operating Temp | –40°C to +85°C - qualified for extended industrial temperature range applications including CNC controllers and ultrasound scanners. |
| Supply Sequencing | Glitch-free - allows VCCA and VCCB to be powered on/off in any order without spurious output transitions that could corrupt downstream logic. |
Pinout & Package
TSSOP-24 (PW) package: 7.8 mm × 6.4 mm body, 0.65 mm lead pitch, exposed thermal pad not present (RHL variant only). Compatible with standard reflow profiles and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA (Pin 1) | A-port supply rail | Powers A-side I/Os and references DIR/OE logic thresholds; must be stable before enabling control signals. |
| DIR (Pin 2) | Direction control input | High = A→B data flow; Low = B→A data flow; referenced to VCCA, not VCCB. |
| A1–A8 (Pins 3–10) | A-port bidirectional I/Os | Track VCCA voltage; require valid logic levels at all times - floating states increase ICCZ and risk latch-up. |
| GND (Pins 11–13) | Ground reference | Three dedicated GND pins minimize ground bounce and improve noise immunity in high-speed switching. |
| B8–B1 (Pins 14–21) | B-port bidirectional I/Os | Track VCCB voltage; electrically isolated from A-port except through transceiver core; must not float. |
| OE (Pin 22) | Output-enable input | Active-low; referenced to VCCA; drives all A/B outputs into high-impedance when high. |
| VCCB (Pins 23–24) | B-port supply rail | Powers B-side I/Os; independent of VCCA; VCCB disconnect triggers automatic high-Z on both ports. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail voltage translation | Independent 1.65V–5.5V operation on A and B ports enables seamless interface between disparate logic families without external components. |
| VCC isolation | Automatic high-impedance output disable when either VCCA or VCCB falls below 100 mV - prevents backdrive during brownout or hot-swap events. |
| Ioff partial-power-down | Blocks current flow into powered-down ports, protecting upstream drivers and meeting IPC/JEDEC requirements for system-level power management. |
| Glitch-free supply sequencing | Eliminates false output transitions during asymmetric power-up/down - critical for avoiding unintended resets or configuration errors in connected peripherals. |
| Robust ESD protection | 4000 V HBM and 1000 V CDM ratings exceed JEDEC standards, reducing field failure risk in manufacturing and end-use environments. |
Applications
| Industrial PLC Interface | Flat-Panel Monitor Controller |
|---|---|
Use Scenario: Interfacing a 3.3V FPGA-based motion controller with legacy 5V I/O modules in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional voltage translator managing data and address bus communication between mismatched voltage domains. Use Value: Eliminates need for discrete level-shifters or resistive networks, reducing BOM count and PCB area while maintaining signal integrity at 10+ MHz clock rates. |
Use Scenario: Connecting a 1.8V video processor to 5V timing controller and display driver ICs in consumer flat-panel monitors. IC Role / Device Role / Timing Role: Level-translating parallel pixel data and control signals (HSYNC/VSYNC/DE) across voltage domains. Use Value: Supports clean 1.8V-to-5V up-translation with sub-10 ns propagation delay, preserving timing margins required for 60 Hz+ refresh rates. |
| Network-Attached Storage | Data Center Switch Management |
Use Scenario: Bridging 2.5V SATA controller logic with 3.3V power management and thermal sensor interfaces in NAS enclosures. IC Role / Device Role / Timing Role: Voltage-level translator for status, alert, and configuration buses operating at ≤1 MHz. Use Value: Enables direct integration of heterogeneous subsystems without custom voltage-domain partitioning or additional regulators. |
Use Scenario: Isolating 3.3V baseboard management controller (BMC) I²C/SMBus lines from 5V switch ASIC configuration registers. IC Role / Device Role / Timing Role: Bidirectional I²C-compatible level shifter with guaranteed glitch-free startup during BMC reset sequences. Use Value: Prevents bus contention during BMC power cycling by enforcing high-Z state until both VCCA and VCCB stabilize. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVC8T245 | Lower VCC range (1.2V–3.6V); higher speed (tPLH < 4 ns at 1.8V); no VCC isolation below 100 mV. | Optimized for ultra-low-voltage mobile SoC interconnects; unsuitable for 5V domain interfaces. | Select when interfacing sub-1.8V logic (e.g., 1.2V I/O) and maximum speed is critical; avoid for 5V systems. |
| TXB0108 | Auto-direction sensing (no DIR pin); supports 1.2V–3.6V translation; higher Ioff (±5 µA); no VCC disconnect. | Designed for I²C, UART, and SPI where direction is inferred from data flow; lacks explicit DIR control. | Choose for simple serial protocols with automatic direction detection; not suitable for parallel bus applications requiring deterministic DIR control. |
Compared with SN74AVC8T245 and TXB0108, the SN74LVC8T245 uniquely supports full 1.65V–5.5V dual-rail operation with VCC isolation and explicit DIR control - making it the only option among the three capable of robust 1.8V↔5V parallel bus translation in industrial control and display systems.
Availability
SN74LVC8T245 is available at Aetrix Electronics and suitable for industrial PLCs, flat-panel monitor controllers, and network-attached storage systems requiring stable component supply across extended temperature ranges and mixed-voltage architectures.
Supply support for SN74LVC8T245 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 solutions with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74LVC8T245 belongs to TI's LVC logic family, designed specifically for low-voltage, high-speed bidirectional bus interfacing in mixed-supply systems - emphasizing robustness, configurability, and seamless integration across voltage domains.
FAQ
What voltage ranges does the SN74LVC8T245 support on its A and B ports?
The SN74LVC8T245 supports 1.65V to 5.5V independently on both VCCA (A port) and VCCB (B port), enabling bidirectional translation between any combination of 1.8V, 2.5V, 3.3V, and 5V logic domains. This range is explicitly specified in the Recommended Operating Conditions table of the SN74LVC8T245 datasheet and validated across temperature and process corners.
How does the SN74LVC8T245 handle power sequencing when VCCA and VCCB are powered up at different times?
The SN74LVC8T245 provides glitch-free power sequencing: either VCCA or VCCB may be powered on or off in any order without causing spurious output transitions. This behavior is guaranteed by internal circuit design and verified per JEDEC JESD78 latch-up testing, ensuring reliable operation during hot-swap or asymmetric power-up scenarios in the SN74LVC8T245.
What happens to the outputs of the SN74LVC8T245 if VCCA is powered but VCCB is disconnected or near 0V?
When VCCB drops below 100 mV or floats while VCCA remains powered, the SN74LVC8T245 activates its VCC isolation feature: all A-port and B-port outputs enter a high-impedance state. This prevents backdrive current and protects connected devices - a behavior confirmed in Section 7.3.5 of the SN74LVC8T245 datasheet and tested under absolute maximum conditions.
Can unused I/O pins on the SN74LVC8T245 be left floating?
No - all A-port and B-port I/O pins on the SN74LVC8T245 must be held at valid logic HIGH or LOW (preferably tied to VCCA, VCCB, or GND) at all times. Floating pins increase ICCZ current, risk oscillation, and may cause excessive power consumption or latch-up, as explicitly warned in Section 5.3 of the SN74LVC8T245 datasheet.
Is the SN74LVC8T245 compatible with I²C or other open-drain bus protocols?
The SN74LVC8T245 is not recommended for I²C or open-drain protocols because it uses push-pull CMOS outputs, not open-drain structures. Its 3-state outputs are designed for parallel bus applications with explicit DIR/OE control. For I²C level shifting, TI recommends dedicated auto-sensing devices like the TXB0108 - not the SN74LVC8T245.
SN74LVC8T245PWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 24-TSSOP (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-TSSOP
SN74LVC8T245PWRG4 FAQ
1.How can I place an order for SN74LVC8T245PWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC8T245PWRG4 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 SN74LVC8T245PWRG4 reliable?
The price and inventory of SN74LVC8T245PWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC8T245PWRG4 is usually 5 days.
3.What payment methods are accepted for SN74LVC8T245PWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC8T245PWRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC8T245PWRG4?
SN74LVC8T245PWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC8T245PWRG4 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 SN74LVC8T245PWRG4?
For technical support, including SN74LVC8T245PWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC8T245PWRG4 requirements.
6.How does Aetrix verify that SN74LVC8T245PWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74LVC8T245PWRG4 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 SN74LVC8T245PWRG4 meets industry standards.
7.What is the process for return or replacement of SN74LVC8T245PWRG4?
All SN74LVC8T245PWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC8T245PWRG4, 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 SN74LVC8T245PWRG4 part is unused and in its original packaging.
Return procedure for SN74LVC8T245PWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74LVC8T245PWRG4 Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
