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Texas Instruments SN74LXC8T245PWR
- Part No.:
- SN74LXC8T245PWR
- Manufacturer:
- Texas Instruments
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LXC8T245PWR.pdf
- Description:
- IC TRANSLATOR BIDIR 24TSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74LXC8T245 from Texas Instruments is an 8-bit dual-supply noninverting bidirectional bus transceiver with configurable level shifting, 3-state outputs, Schmitt-trigger inputs, and VCC isolation. It operates with VCCA and VCCB independently selectable from 1.1 V to 5.5 V, supports up to 420 Mbps (3.3 V → 5.0 V), delivers ±32 mA drive strength at 5 V, and features Ioff-float for partial-power-down operation. It enables robust voltage translation in mixed-voltage microcontroller interfaces.
For engineers reviewing the SN74LXC8T245 datasheet, SN74LXC8T245 pinout, SN74LXC8T245 application, or SN74LXC8T245 equivalent, key selection considerations include dual-rail supply flexibility, guaranteed glitch-free power sequencing, Schmitt-trigger noise immunity on all I/Os, integrated dynamic pull-down resistors, and VCCB-disconnect behavior when either supply drops below 100 mV.
Technical Context
The SN74LXC8T245 implements a fully configurable dual-rail architecture where A-port signals (Ax, DIR, OE) are referenced to VCCA and B-port signals (Bx) to VCCB, enabling independent logic-level domains. Direction control is synchronous and referenced solely to VCCA, ensuring deterministic data flow regardless of VCCB voltage.
Its Ioff-float feature actively pulls down all I/Os before entering high-impedance state when either VCCA or VCCB falls below 100 mV - a hardware-enforced safety mechanism that prevents backfeeding and bus contention during asymmetric power-up/down sequences.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA / VCCB Range | 1.1 V to 5.5 V each - enables direct interface between 1.2-V FPGA I/O and 5-V legacy peripherals without external level-shifting circuitry |
| Max Data Rate | 420 Mbps (3.3 V → 5.0 V) - supports high-speed UART, SPI, and JTAG communication across voltage domains |
| Output Drive | ±32 mA at 5 V - sufficient to directly drive LEDs, small relays, or capacitive loads up to 20 pF without buffer stages |
| Ioff-float Current | ≤2.5 µA over –40°C to +125°C - ensures negligible leakage during partial power-down, critical for battery-backed systems |
| Input Hysteresis | 0.2 V to 1.06 V (ΔVT) - rejects noise up to ~500 mV peak-to-peak on slow-rising mechanical switch or long-trace signals |
| Propagation Delay | 2 ns to 10 ns (typical, VCCA = 5 V, VCCB = 5 V) - meets timing closure for 100+ MHz digital buses with minimal skew |
| ESD Rating | ±4000 V HBM, ±1000 V CDM - exceeds industrial IEC 61000-4-2 system-level ESD requirements without external protection |
Pinout & Package
PW package: 24-pin TSSOP, 7.80 mm × 6.40 mm body, 0.65 mm pitch, exposed thermal pad (recommended grounded).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA (Pin 1) | A-port supply reference | Defines logic thresholds and drive strength for Ax I/Os and DIR/OE control inputs |
| DIR (Pin 2) | Direction control input | High = A→B data flow; low = B→A; referenced strictly to VCCA, not VCCB |
| A1–A8 (Pins 3–10) | Data I/Os (A side) | Bidirectional, Schmitt-triggered, with integrated dynamic pull-down resistors |
| GND (Pins 11–13) | Ground return | Three dedicated GND pins minimize ground bounce in high-speed switching |
| B1–B8 (Pins 14–21) | Data I/Os (B side) | Bidirectional, referenced to VCCB; independent voltage domain from A port |
| OE (Pin 22) | Output enable input | Low = outputs active; high = all Ax/Bx enter high-Z; referenced to VCCA |
| VCCB (Pins 23, 24) | B-port supply reference | Dual VCCB pins reduce IR drop and improve noise immunity on B-side I/Os |
Key Features
| Feature | Design Value |
|---|---|
| Dual-supply level shifting | Independent 1.1–5.5 V operation per port eliminates need for external translators in heterogeneous SoC/FPGA designs |
| Glitch-free power sequencing | No power-order dependency between VCCA and VCCB prevents bus contention during startup/shutdown |
| Schmitt-trigger inputs | Guaranteed 0.2–1.06 V hysteresis suppresses ringing and contact bounce on mechanical switches or unterminated traces |
| Integrated dynamic pull-downs | Reduces external RC debouncing components and PCB area for switch/LED interface applications |
| VCC isolation (Ioff-float) | Automatically forces I/Os into controlled low-Z then high-Z state if either supply collapses - prevents backdrive damage |
Applications
| Industrial Sensor Interface | Multi-Voltage MCU Expansion |
|---|---|
Use Scenario: Interfacing 1.8-V MEMS sensor outputs to a 3.3-V microcontroller ADC input while sharing a common I²C bus. IC Role / Device Role / Timing Role: Bidirectional level translator isolating voltage domains and suppressing noise from motor-driven chassis ground. Use Value: Eliminates external MOSFET translators and reduces layout complexity by supporting simultaneous 1.8-V and 3.3-V signaling on same bus lines. | Use Scenario: Expanding GPIO count of a 5-V PIC MCU using a 1.2-V FPGA configuration interface. IC Role / Device Role / Timing Role: Voltage-aware bus transceiver enabling safe, high-speed data exchange without level-shifter timing overhead. Use Value: Enables direct connection of low-voltage FPGA I/O banks to legacy 5-V peripherals with <10 ns propagation delay and no external biasing. |
| Automotive Body Control Module | Test Equipment Signal Conditioning |
Use Scenario: Isolating 12-V CAN transceiver logic lines from a 2.5-V automotive microcontroller in a door module. IC Role / Device Role / Timing Role: Fault-tolerant level shifter with Ioff-float protecting MCU I/Os during battery disconnect events. Use Value: Prevents backfeeding into powered-down MCU sections when VCCB (CAN side) remains active after main MCU supply loss. | Use Scenario: Conditioning noisy, slow-rising TTL signals from legacy test fixtures before feeding into a 1.5-V logic analyzer input. IC Role / Device Role / Timing Role: Schmitt-triggered signal conditioner with programmable direction and 3-state output control. Use Value: Removes need for discrete RC filters and comparator stages - single-chip solution for debounced, noise-immune signal acquisition. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional level translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TXB0108PWR | Auto-direction sensing (no DIR pin); lower max drive (±24 mA); no Ioff-float - relies on external isolation | Best for simple push-pull buses (e.g., I²C) where direction is inferred; unsuitable for asymmetric power-down scenarios | Select SN74LXC8T245 when explicit DIR control, higher drive, or guaranteed VCC isolation is required. |
| SN74AVCH8T245RHLR | Same pinout and function but uses VQFN (RHL) package; identical electrical specs except slightly lower RθJA (47.4°C/W vs 99.6°C/W for PW) | Preferred for space-constrained, thermally demanding applications requiring better thermal performance | Choose SN74LXC8T245PWR for cost-sensitive TSSOP-based designs with standard PCB assembly processes. |
Compared with TXB0108PWR and SN74AVCH8T245RHLR, the SN74LXC8T245PWR uniquely combines manual DIR control, 32-mA drive, and hardware-enforced Ioff-float - making it the only option among the three qualified for partial-power-down safety-critical systems.
Availability
SN74LXC8T245PWR is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, multi-voltage MCU expansion, and test equipment signal conditioning requiring stable component supply and long-term production continuity.
Supply support for SN74LXC8T245PWR 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 company specializing in analog, embedded processing, and connectivity technologies with over 50 years of innovation in precision analog and logic solutions.
The SN74LXC8T245 belongs to TI's LXC logic family, designed specifically for ultra-low-voltage, high-noise-immunity, dual-supply level translation in space- and power-constrained embedded systems operating from –40°C to +125°C.
FAQ
What is the minimum operating voltage for SN74LXC8T245PWR on either supply rail?
The SN74LXC8T245PWR supports VCCA and VCCB independently from 1.1 V to 5.5 V. At 1.1 V, it maintains full functionality including Schmitt-trigger input thresholds, 3-state control, and Ioff-float behavior - verified across –40°C to +125°C per TI SCES916A datasheet Section 6.3.
Does SN74LXC8T245PWR require external pull-up or pull-down resistors on control inputs?
No. The SN74LXC8T245PWR integrates static pull-down resistors on DIR and OE inputs, allowing them to be left floating without risk of undefined logic states. This eliminates external components and simplifies PCB layout for applications like mechanical switch debouncing or jumper-configured direction control.
How does the Ioff-float feature behave when VCCA is disconnected but VCCB remains powered?
When VCCA drops below 100 mV while VCCB remains active, the SN74LXC8T245PWR first pulls all A- and B-port I/Os low via internal dynamic pull-downs, then transitions them to high-impedance. This two-stage action prevents back-driving VCCB through A-port I/Os and protects downstream circuitry - a behavior explicitly defined in Section 1 Features and Table 6.5.
Can SN74LXC8T245PWR translate between 1.2 V and 5.0 V while maintaining 420-Mbps throughput?
No. The 420-Mbps maximum data rate applies only to 3.3-V-to-5.0-V translation (Section 6.12). For 1.2-V-to-5.0-V translation, the SN74LXC8T245PWR supports up to 40 Mbps - confirmed in the TMAX table under "Up Translation" with VCCI = 1.1–1.3 V and VCCO = 4.5–5.5 V.
Is SN74LXC8T245PWR compatible with legacy LVC-family level shifters in terms of pinout and logic behavior?
Yes. The SN74LXC8T245PWR is explicitly stated as compatible with LVC-family level shifters (Section 1 Features) and shares identical functional pinout (DIR, OE, A/B ports, dual VCC/GND) with industry-standard 24-pin bus transceivers. Its control logic (DIR/OE referenced to VCCA) and 3-state behavior match LVC conventions, enabling drop-in replacement in many existing designs.
SN74LXC8T245PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LXC
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 1.08V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
SN74LXC8T245PWR FAQ
1.How can I place an order for SN74LXC8T245PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LXC8T245PWR 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 SN74LXC8T245PWR reliable?
The price and inventory of SN74LXC8T245PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LXC8T245PWR is usually 5 days.
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SN74LXC8T245PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LXC8T245PWR 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 SN74LXC8T245PWR?
For technical support, including SN74LXC8T245PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LXC8T245PWR requirements.
6.How does Aetrix verify that SN74LXC8T245PWR is sourced from the original manufacturer or authorized distributors?
All SN74LXC8T245PWR 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 SN74LXC8T245PWR meets industry standards.
7.What is the process for return or replacement of SN74LXC8T245PWR?
All SN74LXC8T245PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LXC8T245PWR, 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 SN74LXC8T245PWR part is unused and in its original packaging.
Return procedure for SN74LXC8T245PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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