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Texas Instruments SN74LVC8T245QPWRQ1
- Part No.:
- SN74LVC8T245QPWRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVC8T245QPWRQ1.pdf
- Description:
- IC TRANSLATION TXRX 5.5V 24TSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74LVC8T245QPWRQ1 from Texas Instruments is an AEC-Q100 qualified automotive 8-bit dual-supply bus transceiver enabling bidirectional voltage translation between 1.65V–5.5V domains. It features configurable VCCA/VCCB rails, 3-state outputs, Ioff partial-power-down support, and VCC isolation - deployed in ADAS domain controllers and automotive head units for robust inter-voltage-node communication.
For engineers reviewing the SN74LVC8T245QPWRQ1 datasheet, SN74LVC8T245QPWRQ1 pinout, SN74LVC8T245QPWRQ1 application, or SN74LVC8T245QPWRQ1 equivalent, key selection criteria include dual-rail voltage flexibility (1.65V–5.5V per port), glitch-free power sequencing, -40°C to +125°C operation, AEC-Q100 qualification, and 24-pin TSSOP packaging with verified DIR/OE control logic.
Technical Context
The SN74LVC8T245QPWRQ1 implements asynchronous bidirectional data flow controlled by DIR (direction) and OE (output enable), both referenced to VCCA. Its dual-rail architecture allows independent A-port (VCCA-referenced) and B-port (VCCB-referenced) operation across 1.65V–5.5V, enabling translation between 1.8V, 2.5V, 3.3V, and 5V nodes without level-shifter ICs.
VCC isolation ensures all I/Os enter high-impedance when either VCCA or VCCB drops below 100 mV or floats; Ioff limits backflow current during partial power-down. Propagation delays range from 0.3 ns (tPHZ at 5V) to 40 ns (tPZH at 1.8V), with output drive up to ±32 mA at 5V supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA / VCCB Range | 1.65V to 5.5V each - enables universal translation between 1.8V/2.5V/3.3V/5V logic domains |
| Operating Temperature | -40°C to +125°C - qualified for under-hood and infotainment systems in automotive applications |
| Propagation Delay (tPLH/tPHL) | 0.3 ns to 28.8 ns - varies with VCCA/VCCB combinations; supports >30 MHz data rates in typical configurations |
| Output Drive Strength | ±32 mA at 5V - sufficient to drive multiple CMOS loads or moderate PCB trace capacitance |
| Ioff Leakage | ±11 μA max - prevents damaging backflow during system power sequencing or partial shutdown |
| ESD Rating | ±4000V HBM, ±1000V CDM - exceeds automotive ESD robustness requirements per JESD22 |
| AEC-Q100 Grade | Grade 1 - certified for automotive powertrain, ADAS, and body electronics applications |
Pinout & Package
Packaged in a 24-pin TSSOP (PW) measuring 7.8 mm × 6.4 mm, the SN74LVC8T245QPWRQ1 uses surface-mount construction with gull-wing leads and thermal pad-compatible layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA (Pin 1) | A-port supply reference | Supplies A-side I/Os and control inputs (DIR/OE); sets VIH/VIL thresholds for control pins |
| VCCB (Pins 23, 24) | B-port supply reference | Supplies B-side I/Os only; independent of VCCA for true dual-rail translation |
| DIR (Pin 2) | Direction control input | High = A→B data flow; Low = B→A; referenced to VCCA, not VCCB |
| OE (Pin 22) | Output-enable input | Low = active outputs; High = all A/B ports in high-impedance; referenced to VCCA |
| A1–A8 (Pins 3–10) | A-port I/Os | Bi-directional signals referenced to VCCA; must be driven HIGH/LOW - no floating allowed |
| B1–B8 (Pins 14–21) | B-port I/Os | Bi-directional signals referenced to VCCB; tolerate voltage up to VCCB + 0.5V in active state |
| GND (Pins 11, 12, 13) | Ground return | Three dedicated GND pins reduce ground bounce and improve noise immunity in high-speed switching |
Key Features
| Feature | Design Value |
|---|---|
| Fully configurable dual-rail supply | Independent VCCA (1.65V–5.5V) and VCCB (1.65V–5.5V) allow any-to-any voltage translation without external components |
| VCC isolation & disconnect | Automatically forces all I/Os into high-impedance if either VCCA or VCCB falls below 100 mV or floats - prevents bus contention during power-up/down |
| Ioff partial-power-down support | Blocks current backflow when powered down; leakage ≤ ±11 μA ensures safe integration in multi-rail systems with staggered supply sequencing |
| Glitch-free power supply sequencing | Eliminates false transitions on I/Os regardless of VCCA/VCCB ramp order - avoids spurious resets or misconfigurations in downstream peripherals |
| AEC-Q100 Grade 1 qualification | Validated for automotive use including temperature cycling, humidity testing, and mechanical shock - suitable for safety-critical subsystems |
Applications
| ADAS Domain Controller | Automotive Head Unit |
|---|---|
|
Use Scenario: Interfacing 3.3V camera sensor interface with 5V video processing SoC in centralized ADAS compute module. IC Role / Device Role / Timing Role: Bidirectional voltage translator managing pixel data and control signals between mismatched voltage domains. Use Value: Eliminates need for discrete level-shifting circuitry while maintaining signal integrity at >25 MHz pixel clock rates and supporting hot-plug detection via Ioff. |
Use Scenario: Connecting 1.8V infotainment MCU GPIOs to 5V display driver and audio codec peripherals. IC Role / Device Role / Timing Role: Configurable bus transceiver enabling flexible peripheral expansion without redesigning PCB power architecture. Use Value: Reduces BOM count by consolidating eight independent level shifters into one AEC-Q100-compliant package with integrated VCC isolation. |
| High-Voltage Traction Inverter | Low-Voltage Traction Inverter |
|
Use Scenario: Isolating 5V CAN FD controller signals from 3.3V gate driver monitoring logic in 400V+ battery systems. IC Role / Device Role / Timing Role: Voltage-translating interface with fail-safe high-impedance behavior during supply fault conditions. Use Value: VCC isolation ensures gate driver remains undriven if 5V rail collapses, preventing unintended IGBT turn-on during fault recovery. |
Use Scenario: Bridging 2.5V battery management unit (BMU) communication lines with 1.8V microcontroller in 48V mild-hybrid architectures. IC Role / Device Role / Timing Role: Low-voltage bidirectional translator supporting SMBus/I²C-compatible signaling with minimal propagation delay. Use Value: Enables direct connection without pull-up resistor reconfiguration; tPLH < 10 ns at 2.5V/1.8V ensures timing compliance for 400 kHz SMBus. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVC8T245RHLR | Non-automotive grade; supports 1.2V–3.6V rails only; higher speed (tPLH down to 1.9 ns) but no AEC-Q100 or VCC isolation | Limited to industrial/commercial systems; unsuitable for automotive safety-critical functions requiring fault containment | Select only for cost-sensitive non-automotive designs where 1.2V compatibility and sub-2ns timing outweigh isolation needs |
| TXS0108EPWR | Auto-direction sensing (no DIR pin); supports 1.2V–3.6V; lower drive (±24 mA); lacks VCC isolation and AEC-Q100 qualification | Used in simple uni-directional or auto-sensing interfaces; cannot replace SN74LVC8T245QPWRQ1 in DIR-controlled bidirectional buses | Choose only when direction is predictable and automatic, and automotive qualification is not required |
Compared with SN74AVC8T245RHLR and TXS0108EPWR, the SN74LVC8T245QPWRQ1 uniquely combines AEC-Q100 Grade 1, full 1.65V–5.5V dual-rail flexibility, VCC isolation, and explicit DIR control - making it the sole option for safety-aware, multi-voltage automotive bus bridging where supply sequencing faults must be contained.
Availability
SN74LVC8T245QPWRQ1 is available at Aetrix Electronics and suitable for automotive ADAS domain controllers, traction inverter monitoring systems, and infotainment head units requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for SN74LVC8T245QPWRQ1 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 automotive-grade ICs with decades of automotive qualification expertise and ISO/TS 16949-certified manufacturing.
The SN74LVC8T245QPWRQ1 belongs to TI's LVC-Q1 automotive logic family, designed specifically for voltage translation in safety-critical vehicle subsystems where reliability, wide supply range, and fault containment are mandatory.
FAQ
What is the maximum allowable voltage difference between VCCA and VCCB for reliable operation of the SN74LVC8T245QPWRQ1?
The SN74LVC8T245QPWRQ1 permits any combination of VCCA and VCCB within 1.65V to 5.5V - including simultaneous operation at 1.8V and 5V. No maximum differential is specified; the device is explicitly rated for full-range independent rail operation. Absolute maximum ratings allow up to 6.5V on either supply, but functional operation requires both supplies to remain within 1.65V–5.5V per the recommended operating conditions table in the SN74LVC8T245QPWRQ1 datasheet.
Does the SN74LVC8T245QPWRQ1 support true bidirectional data flow without external direction control logic?
No - the SN74LVC8T245QPWRQ1 requires an external DIR signal to determine data direction. Unlike auto-sensing translators (e.g., TXS series), it has no internal direction detection. DIR must be actively driven high for A→B transmission or low for B→A transmission. This explicit control provides deterministic timing and eliminates metastability risks in high-speed automotive buses, which is why the SN74LVC8T245QPWRQ1 is preferred in ADAS and inverter applications.
How does the VCC isolation feature behave when VCCA is powered but VCCB is disconnected?
When VCCB drops below 100 mV or floats while VCCA remains powered, the SN74LVC8T245QPWRQ1 disables all B-port outputs and places them in high-impedance - simultaneously forcing A-port outputs into high-impedance regardless of DIR/OE state. This dual-port shutdown prevents bus contention and backfeeding. The feature is intrinsic to the SN74LVC8T245QPWRQ1 silicon design and requires no external circuitry to activate.
Can unused I/O pins on the SN74LVC8T245QPWRQ1 be left floating in automotive applications?
No - all unused A- and B-port I/Os on the SN74LVC8T245QPWRQ1 must be actively driven HIGH or LOW (preferably to VCCA or GND for A-port, VCCB or GND for B-port). Floating inputs increase ICC and ICCZ, cause unpredictable output states, and risk violating AEC-Q100 reliability requirements. TI explicitly warns against floating I/Os in Section 5.3 of the SN74LVC8T245QPWRQ1 datasheet due to potential latch-up and EMI susceptibility.
What is the purpose of tying OE to VCCA through a pullup resistor during power-up of the SN74LVC8T245QPWRQ1?
Tying OE to VCCA via a pullup resistor ensures the SN74LVC8T245QPWRQ1 starts in high-impedance mode until both VCCA and VCCB are fully stabilized - preventing bus glitches or contention during supply ramp-up. The resistor value depends on the driver's sink capability; TI recommends calculating minimum resistance based on the current-sinking spec of the OE-driving source. This practice is critical for robust power sequencing in automotive modules and is documented in the SN74LVC8T245QPWRQ1 functional description section.
SN74LVC8T245QPWRQ1 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:
- 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:
- 1.65V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
SN74LVC8T245QPWRQ1 FAQ
1.How can I place an order for SN74LVC8T245QPWRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC8T245QPWRQ1 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 SN74LVC8T245QPWRQ1 reliable?
The price and inventory of SN74LVC8T245QPWRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC8T245QPWRQ1 is usually 5 days.
3.What payment methods are accepted for SN74LVC8T245QPWRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC8T245QPWRQ1 transactions.
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4.How is shipping managed for SN74LVC8T245QPWRQ1?
SN74LVC8T245QPWRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC8T245QPWRQ1 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 SN74LVC8T245QPWRQ1?
For technical support, including SN74LVC8T245QPWRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC8T245QPWRQ1 requirements.
6.How does Aetrix verify that SN74LVC8T245QPWRQ1 is sourced from the original manufacturer or authorized distributors?
All SN74LVC8T245QPWRQ1 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 SN74LVC8T245QPWRQ1 meets industry standards.
7.What is the process for return or replacement of SN74LVC8T245QPWRQ1?
All SN74LVC8T245QPWRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC8T245QPWRQ1, 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 SN74LVC8T245QPWRQ1 part is unused and in its original packaging.
Return procedure for SN74LVC8T245QPWRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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