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Texas Instruments SN74LVC8T245PWRE4
- Part No.:
- SN74LVC8T245PWRE4
- Manufacturer:
- Texas Instruments
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVC8T245PWRE4.pdf
- Description:
- IC TRANSLATION TXRX 5.5V 24TSSOP
- 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/OE, and Ioff support for partial-power-down operation. It is used in mixed-voltage system interconnects such as 1.8V microcontrollers interfacing with 3.3V or 5V peripherals.
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 verified 24-pin TSSOP (PW) package compatibility with industrial temperature range (–40°C to +85°C).
Technical Context
The SN74LVC8T245 implements a fully asynchronous, direction-controlled bidirectional data path: when OE is low and DIR is high, data flows A→B; when OE is low and DIR is low, data flows B→A; when OE is high, both ports enter high-impedance state. Control inputs (DIR, OE) are referenced exclusively to VCCA, decoupling logic control from B-side supply conditions.
Its dual-rail architecture supports simultaneous operation across mismatched voltage domains - e.g., 1.8V A-port ↔ 5V B-port - with guaranteed VIH/VIL thresholds scaling with VCCA, and output drive strength (±32 mA at 5V) and propagation delays (e.g., tPLH ≤ 4.2 ns at VCCA = 5V, VCCB = 5V) validated per supply combination.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA / VCCB Range | 1.65V to 5.5V each - enables universal translation among 1.8V/2.5V/3.3V/5V nodes without level-shifter redesign. |
| Max Output Drive | ±32 mA at 5V - sufficient to drive standard CMOS loads and multiple fanouts without external buffers. |
| tPLH / tPHL (max) | 4.2 ns at 5V/5V - ensures sub-5ns propagation for high-speed digital interconnects up to ~100 MHz. |
| Ioff Leakage | ±2 µA max - prevents backflow current during partial power-down, critical for hot-swap and battery-backed systems. |
| VCC Isolation Threshold | <100 mV on either VCCA or VCCB - forces all I/Os into high-Z before supply collapse, avoiding bus contention. |
| ESD Rating (HBM) | ±4000 V - exceeds JEDEC JESD22-A114 requirement, supporting robust handling in manufacturing and field environments. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded applications including PLCs and network equipment. |
Pinout & Package
TSSOP-24 (PW) package: 7.8 mm × 6.4 mm body, 0.65 mm pitch, exposed thermal pad not present (RHL variant has pad; PW does not).
| 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; referenced to VCCA - no dependency on VCCB for logic interpretation. |
| A1–A8 (Pins 3–10) | A-port bidirectional I/Os | Track VCCA voltage; tolerate input levels up to 6.5V (absolute max); require defined HIGH/LOW to avoid excess ICCZ. |
| GND (Pins 11–13) | Ground reference | Three dedicated GND pins minimize ground bounce and improve noise immunity across 8-bit data paths. |
| B8–B1 (Pins 14–21) | B-port bidirectional I/Os | Track VCCB voltage; independent of VCCA; same absolute voltage rating (–0.5V to 6.5V) as A-port. |
| OE (Pin 22) | Output-enable input | Active-low; referenced to VCCA; pulling high disables both ports - used for bus isolation during power-up/down. |
| VCCB (Pins 23–24) | B-port supply rail | Dual VCCB pins reduce IR drop and improve current delivery to B-side drivers under heavy load. |
Key Features
| Feature | Design Value |
|---|---|
| Configurable dual-rail operation | Independent VCCA/VCCB supplies allow arbitrary pairing of 1.65–5.5V domains - eliminates need for discrete translators per voltage pair. |
| Glitch-free power sequencing | Either VCCA or VCCB may power up/down in any order without generating spurious output transitions - prevents false resets in connected peripherals. |
| VCC isolation & disconnect | Outputs auto-disable into high-Z if either supply drops below 100 mV or floats - enforces safe bus state during brownout or hot-swap events. |
| Ioff partial-power-down support | I/Os enter high-Z with <±2 µA leakage when unpowered - enables live insertion and system-level power gating without signal integrity risk. |
| Robust ESD protection | 4000V HBM and 1000V CDM ratings meet industrial handling requirements - reduces field failure risk in assembly and end-use environments. |
Applications
| Industrial PLC Interface | Embedded Controller Interconnect |
|---|---|
|
Use Scenario: Connecting a 3.3V ARM-based motion controller to legacy 5V I/O modules in a programmable logic controller rack. IC Role / Device Role: Bidirectional voltage translator isolating logic domains while preserving timing-critical control signals (e.g., step/direction pulses). Use Value: Eliminates need for separate unidirectional level shifters; supports real-time deterministic latency (≤4.2 ns) and withstands industrial ESD events. |
Use Scenario: Interfacing a 1.8V FPGA I/O bank with a 2.5V DDR memory subsystem in a compact edge AI inference module. IC Role / Device Role: 8-bit parallel translator enabling synchronous data transfer between mismatched voltage domains with shared clock domain. Use Value: Maintains signal integrity across full 8-bit bus with matched rise/fall times; Ioff prevents current leakage during FPGA configuration phase. |
| Flat-Panel Display Timing Bridge | Network Storage Backplane |
|
Use Scenario: Translating command/status signals between a 1.8V display controller SoC and 3.3V timing generator IC in a sound bar or monitor. IC Role / Device Role: Direction-controlled bus interface managing bi-directional EDID and DDC communication over I²C-compatible lines. Use Value: Supports hot-plug detection via VCC isolation - automatically disables outputs when display cable is disconnected, preventing bus contention. |
Use Scenario: Enabling communication between a 5V SAS expander ASIC and 3.3V NVMe SSD controllers in enterprise NAS hardware. IC Role / Device Role: High-reliability voltage translator on PCIe sideband and management buses (e.g., SMBus, GPIO). Use Value: Guaranteed –40°C to +85°C operation and ±4000V HBM withstand capability ensure long-term reliability in thermally dense storage enclosures. |
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); faster max speed (tPLH ≤ 2.8 ns at 2.5V); no VCC isolation below 100 mV. | Optimized for ultra-low-voltage mobile interfaces (e.g., 1.2V/1.8V core-to-peripheral), not mixed 5V/3.3V industrial systems. | Select SN74AVC8T245 only when both sides operate ≤3.6V and sub-3ns timing is required; not drop-in for 5V B-port use. |
| TXB0108 | Auto-direction sensing (no DIR pin); supports 1.2V–3.6V translation; higher Ioff (±5 µA); no VCC disconnect feature. | Suited for simple push-pull data buses where direction is implicit (e.g., UART, SPI), not control-heavy bidirectional protocols. | Choose TXB0108 for direction-agnostic links with minimal pin count; avoid where explicit DIR control or 5V tolerance is needed. |
Compared with SN74AVC8T245 and TXB0108, the SN74LVC8T245 uniquely supports full 1.65–5.5V dual-rail operation with guaranteed VCC isolation and industrial temperature range - making it the only option for robust 5V↔3.3V/2.5V/1.8V bridging in safety-critical or thermally demanding environments.
Availability
SN74LVC8T245 is available at Aetrix Electronics and suitable for industrial automation, embedded computing, and consumer electronics requiring stable component supply across extended temperature and mixed-voltage design cycles.
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 technologies with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74LVC8T245 belongs to TI's LVC logic family, designed specifically for robust, low-voltage bidirectional bus translation in mixed-supply systems - emphasizing glitch immunity, power sequencing resilience, and wide-voltage interoperability.
FAQ
What voltage ranges does the SN74LVC8T245 support on its A and B ports?
The SN74LVC8T245 supports independent supply voltages from 1.65V to 5.5V on both VCCA (A port) and VCCB (B port). This allows translation between any combination of common logic levels - including 1.8V ↔ 3.3V, 2.5V ↔ 5V, or 1.8V ↔ 5V - without external components. The device's input thresholds scale with VCCA, and I/Os tolerate up to 6.5V (absolute max) regardless of supply.
How does the SN74LVC8T245 handle power sequencing when VCCA and VCCB are powered independently?
The SN74LVC8T245 features glitch-free power sequencing: either VCCA or VCCB may be powered on or off in any order without causing unintended output transitions. If either supply drops below 100 mV or floats, the VCC isolation feature forces all I/Os into high-impedance state. This behavior is intrinsic to the silicon design and requires no external circuitry - ensuring safe bus states during hot-swap or brownout conditions.
What is the function of the DIR and OE pins on the SN74LVC8T245, and how are they referenced?
DIR (Pin 2) controls data direction: high enables A→B transmission; low enables B→A. OE (Pin 22) enables/disables outputs: low activates the selected port; high places both A and B ports in high-impedance state. Critically, both DIR and OE are referenced to VCCA - meaning their logic thresholds (VIH/VIL) scale with VCCA voltage and are independent of VCCB. This decouples control logic from B-side supply stability.
Does the SN74LVC8T245 support partial-power-down operation, and how is it implemented?
Yes, the SN74LVC8T245 supports partial-power-down via its Ioff feature. When either VCCA or VCCB is at 0V, the Ioff circuitry disables all I/O outputs, limiting leakage current to ±2 µA maximum. This prevents damaging backflow current into powered-down sections of the system - a critical requirement for hot-pluggable modules, battery-backed subsystems, and energy-efficient designs where portions of the system may be selectively powered down.
What package is used for the SN74LVC8T245PWRE4, and what are its key mechanical characteristics?
The SN74LVC8T245PWRE4 uses the TSSOP-24 (PW) package: 7.8 mm × 6.4 mm body size, 0.65 mm lead pitch, and 24 gull-wing leads. It has no exposed thermal pad (unlike the RHL QFN variant). The PW package is RoHS-compliant, tape-and-reel packaged (RE4 suffix), and optimized for automated SMT assembly in space-constrained industrial PCBs - offering better thermal performance than SSOP variants (RθJA = 100.6°C/W) while maintaining legacy footprint compatibility.
SN74LVC8T245PWRE4 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
SN74LVC8T245PWRE4 FAQ
1.How can I place an order for SN74LVC8T245PWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC8T245PWRE4 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 SN74LVC8T245PWRE4 reliable?
The price and inventory of SN74LVC8T245PWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC8T245PWRE4 is usually 5 days.
3.What payment methods are accepted for SN74LVC8T245PWRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC8T245PWRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC8T245PWRE4?
SN74LVC8T245PWRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC8T245PWRE4 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 SN74LVC8T245PWRE4?
For technical support, including SN74LVC8T245PWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC8T245PWRE4 requirements.
6.How does Aetrix verify that SN74LVC8T245PWRE4 is sourced from the original manufacturer or authorized distributors?
All SN74LVC8T245PWRE4 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 SN74LVC8T245PWRE4 meets industry standards.
7.What is the process for return or replacement of SN74LVC8T245PWRE4?
All SN74LVC8T245PWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC8T245PWRE4, 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 SN74LVC8T245PWRE4 part is unused and in its original packaging.
Return procedure for SN74LVC8T245PWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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