SN74LVC8T245QPWRQ1 - 8-Bit Auto Level Shifter | Texas Instruments
MPN: SN74LVC8T245QPWRQ1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.45 | $1.45 |
| 10 | $1.31 | $13.10 |
| 100 | $1.05 | $105.00 |
| 500 | $0.88 | $440.00 |
| 1,000 | $0.72 | $720.00 |
SN74LVC8T245QPWRQ1 Overview
A dual-supply bus transceiver is a logic component that moves data between two digital buses operating at different voltage levels. In the power-management and signal-chain hierarchy, it belongs to the level-translator family within the broader logic IC category. The SN74LVC8T245-Q1 uses two independent supply rails, VCCA and VCCB, each operable from 1.65V to 5.5V, enabling bidirectional translation between any two voltage domains, such as 1.8V MCUs communicating with 3.3V or 5V peripherals.
Key features include direction-controlled (DIR) and output-enable (OE) pins supplied by VCCA, 3-state outputs for bus sharing, Ioff and power-up 3-state support for hot-insertion safety, and 5.5V-tolerant inputs. The device transmits data from A to B when B-port outputs are active, and from B to A otherwise, supporting asynchronous two-way bus communication with configurable translation on every bit.
Architecturally, the device belongs to the TI LVC (Low-Voltage CMOS) family and the Widebus+ 8-bit format, combining fast propagation times at 3.3V with robust mixed-mode signal operation on all ports. Data-sheet-level design freedom comes from independent VCCA/VCCB pinout ordering, which simplifies PCB routing between voltage domains.
Typical applications include automotive body and gateway ECUs translating MCU GPIO to CAN/LIN transceiver logic levels, infotainment and display module bus isolation, and industrial PLC I/O modules interfacing 3.3V controllers with 5V sensors. The 3-state outputs let multiple transceivers share one bus without contention.
Design tip: tie OE high or low through a pull resistor at power-up to prevent bus contention, since the control pins are referenced to VCCA; ensure VCCA ramps before the uncontrolled bus is driven.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet. Pricing shown as of 2026-09-01.
Drop-in alternatives for SN74LVC8T245QPWRQ1 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with SN74LVC8T245QPWRQ1 (same form factor and footprint) — differing in Family, Function, Operating Temperature, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
SN74LVC8T245PWR
✅ Drop-In✓ In Stock
$0.175 / Unit
View Datasheet →SN74LVC8T245QPWRG4Q1
✅ Drop-In📋 Reference alternative (not in catalog)
SN74LXC8T245PWR
✅ Drop-In📋 Reference alternative (not in catalog)
SN74AVC8T245PWR
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
SN74LVC8T245QPWRQ1 Maximum Ratings & Electrical Characteristics
| Function | 8-bit bidirectional dual-supply bus transceiver with voltage translation |
| Bits per Element | 8 |
| Supply Voltage VCCA | 1.65 V to 5.5 V |
| Supply Voltage VCCB | 1.65 V to 5.5 V |
| Input Tolerance | Inputs accept voltages up to 5.5 V |
| Output Type | 3-State |
| Direction Control | DIR pin, supplied by VCCA |
| Output Enable | OE pin, supplied by VCCA |
| Hot Insertion | Ioff and power-up 3-state support |
| Automotive Qualification | AEC-Q100 qualified |
| Operating Temperature | -40C to +125C |
| Package | 24-pin TSSOP (PW) |
| Mounting Type | Surface Mount |
| Packaging | Tape and Reel (T/R) |
| Family | LVC (Low-Voltage CMOS), Widebus+ series |
| Marking Code | NH245Q |
| RoHS Status | Compliant |
SN74LVC8T245QPWRQ1 Pin Configuration
| Pin 1 | OE — Output enable, active high, referenced to VCCA |
| Pin 2 | A1 — A-port data bit 1 |
| Pin 3 | A2 — A-port data bit 2 |
| Pin 4 | A3 — A-port data bit 3 |
| Pin 5 | A4 — A-port data bit 4 |
| Pin 6 | A5 — A-port data bit 5 |
| Pin 7 | A6 — A-port data bit 6 |
| Pin 8 | A7 — A-port data bit 7 |
| Pin 9 | A8 — A-port data bit 8 |
| Pin 10 | GND — Ground |
| Pin 11 | B1 — B-port data bit 1 |
| Pin 12 | B2 — B-port data bit 2 |
| Pin 13 | B3 — B-port data bit 3 |
| Pin 14 | B4 — B-port data bit 4 |
| Pin 15 | B5 — B-port data bit 5 |
| Pin 16 | B6 — B-port data bit 6 |
| Pin 17 | B7 — B-port data bit 7 |
| Pin 18 | B8 — B-port data bit 8 |
| Pin 19 | DIR — Direction control, referenced to VCCA |
| Pin 20 | VCCB — B-port supply, 1.65 V to 5.5 V |
| Pin 21 | NC — Not connected (per datasheet) |
| Pin 22 | NC — Not connected (per datasheet) |
| Pin 23 | NC — Not connected (per datasheet) |
| Pin 24 | VCCA — A-port supply, 1.65 V to 5.5 V |
Typical Applications
SN74LVC8T245QPWRQ1 is suitable for 6 applications: Automotive Gateway and Body ECUs, Infotainment and Display Modules, Industrial PLC I/O Modules, Hot-Insertion Board and Blade Systems, Mixed-Voltage MCU-to-Peripheral Interfaces, Test and Measurement Equipment.
Automotive Gateway and Body ECUs
In automotive gateway and body-control ECUs, a 3.3V microcontroller must reliably drive 5V CAN/LIN transceiver logic and 5V sensor inputs while meeting AEC-Q100 temperature requirements. The SN74LVC8T245QPWRQ1 fits because both VCCA and VCCB operate from 1.65V to 5.5V, and the device is qualified from -40C to +125C. The DIR pin lets the MCU switch the transceiver between transmitting diagnostic frames and receiving bus responses in a single 24-pin TSSOP footprint. Ioff and power-up 3-state outputs prevent bus contention during crank transients when supplies ramp asynchronously. Place 100nF decoupling capacitors on both VCCA and VCCB close to pins 24 and 20, and pull OE to a defined state so the module cannot drive the harness before the gateway MCU boots and asserts direction control.
Recommended
Infotainment and Display Modules
Head units and display modules mix 1.8V application processors with 3.3V or 5V peripheral buses for touch controllers, backlight drivers, and panel interfaces. The SN74LVC8T245QPWRQ1 provides 8-bit bidirectional translation between these domains with the AEC-Q100 qualification infotainment platforms demand. Because each bit is translated by the same VCCA/VCCB rails, an entire 8-bit parallel control or data bus crosses the domain boundary in one package, saving board area versus single-bit translators. The 3-state outputs let the processor share one bus among multiple display peripherals by asserting OE only for the addressed device. Design consideration: keep the VCCA rail on the processor side so the OE and DIR logic thresholds match the low-voltage GPIO bank, and verify propagation delay at the operating capacitive load for high-speed parallel links.
Recommended
Industrial PLC I/O Modules
Programmable logic controller I/O cards commonly interface a 3.3V microcontroller or FPGA with 5V field-side sensors and actuators. The SN74LVC8T245QPWRQ1 handles this translation across eight channels, and its -40C to +125C AEC-Q100 rating comfortably exceeds industrial temperature classes, giving extra margin near enclosures and power stages. The DIR pin allows a single card design to switch between input modules (B-to-A) and output modules (A-to-B) under firmware control, reducing SKU count. Inputs tolerate up to 5.5V regardless of the supply, providing robustness against field-wiring overvoltages within the device rating. Tie OE through a pull-down resistor so the module powers up disconnected from the field bus, and add series resistors on B-port lines to limit fault current during wiring errors.
Recommended
Hot-Insertion Board and Blade Systems
Server blades, removable cards, and telecom line cards are inserted into backplanes that remain powered, so every bus crossing the connector needs Ioff protection. The SN74LVC8T245QPWRQ1 provides Ioff circuitry and power-up 3-state outputs, meaning its I/O pins stay high-impedance while VCCA or VCCB is unpowered, preventing backplane corruption during insertion. Its 5.5V-tolerant inputs also protect against partial-rail conditions during the ramp sequence. Use the OE pin driven by the card-insertion (PRESENT) signal so the transceiver connects to the bus only after both supplies are stable. Because this automotive-qualified part is available in tape-and-reel, high-volume blade manufacturers can run standard SMT assembly. Add 100nF plus 10uF decoupling per rail to absorb the inrush of backplane bus charging.
Recommended
Mixed-Voltage MCU-to-Peripheral Interfaces
Embedded designs frequently pair a 1.8V microcontroller with 3.3V memories, sensors, and communication ICs. The SN74LVC8T245QPWRQ1 bridges eight signals in one direction-controlled package: set VCCA to 1.8V at the MCU bank and VCCB to 3.3V or 5V at the peripheral bank, and the device produces clean full-swing logic on both sides. Control thresholds for DIR and OE are referenced to VCCA, so the low-voltage GPIO can switch direction mid-transaction, useful for bidirectional parallel interfaces such as memory-style data buses or bit-banged protocols. At 3.3V operation the LVC family delivers fast propagation times suitable for multi-MHz parallel buses. Keep traces short and matched on both sides to minimize skew, and confirm the peripheral's input capacitance stays within the drive capability at the target data rate.
Recommended
Test and Measurement Equipment
Bench instruments and automated test equipment must stimulate and monitor devices spanning 1.8V, 2.5V, 3.3V, and 5V logic families. The SN74LVC8T245QPWRQ1 lets one probe or driver channel bank adapt to the device-under-test supply by simply re-powering VCCA or VCCB from programmable rails in the 1.65V to 5.5V range, with no firmware change to the translation logic. The 3-state outputs disconnect the driver from the DUT node during measurement-only phases via OE, avoiding load contamination. The AEC-Q100 rating provides the ruggedness margin test houses value for thermally cycled racks. For signal integrity, place the translator physically close to the DUT connector and use ground pins 10 and the TSSOP pad pattern as a low-inductance return; verify overshoot on 5V rails with an oscilloscope during fast edge driving.
Recommended
Recommended Products Summary
Engineering reference data for SN74LVC8T245QPWRQ1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SN74LVC8T245PWR | SN74LVC8T245QPWRG4Q1 | SN74LXC8T245PWR | SN74AVC8T245PWR |
|---|---|---|---|---|---|
| Package | 24-TSSOP (PW) | 24-TSSOP (PW) - same | 24-TSSOP (PW) - same | 24-TSSOP (PW) - same | 24-TSSOP (PW) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| AEC-Q100 Qualification | Qualified (-40C to +125C) | Not qualified (standard grade) | Qualified (-40C to +125C) | Not qualified (standard grade) | Not qualified (standard grade) |
| Output Type | 3-State | 3-State | 3-State | 3-State | 3-State |
| Direction Control | DIR pin (VCCA referenced) | DIR pin (VCCA referenced) | DIR pin (VCCA referenced) | DIR pin | DIR pin |
| Hot Insertion / Ioff | Yes (Ioff + power-up 3-state) | Yes (Ioff + power-up 3-state) | Yes (Ioff + power-up 3-state) | Yes | Yes (partial power-down Ioff) |
| Drive / Speed Class | LVC family, fast tpd at 3.3 V | LVC family, identical die class | LVC family, identical die class | LXC family, comparable drive | AVC family, stronger drive / faster tpd |
| Packaging | Tape & Reel | Tape & Reel | Tape & Reel | Tape & Reel | Tape & Reel |
Key Differentiators
- Automotive AEC-Q100 qualification (vs SN74LVC8T245PWR)
- Trade-off: standard-grade savings (vs SN74LVC8T245PWR)
- Deterministic DIR-controlled direction (vs TXS0108EQPWRQ1)
- Performance upgrade path in same footprint (vs SN74AVC8T245PWR)
Design Notes
The DIR and OE control pins are referenced to VCCA, not VCCB. Always define OE with a 10k pull resistor at power-up so the outputs remain in 3-state until the MCU asserts direction; an undriven OE during VCCA ramp can momentarily back-drive the A-side bus. Also ensure VCCA is present before DIR toggles, otherwise the transceiver direction is undefined and bus contention on a shared 5V bus can occur. This applies equally to the non-automotive SN74LVC8T245PWR drop-in variant.
Decouple both supplies independently: 100nF ceramic capacitor within 2mm of VCCA (pin 24) and VCCB (pin 20), plus one 10uF bulk capacitor per rail per group of translators. Icc for the LVC family is small, but during simultaneous 8-bit switching, dynamic supply current spikes appear on both rails independently because the two domains switch asynchronously. Do not tie VCCA and VCCB together even when translating same-voltage domains unless the datasheet configuration for that mode is followed, or the translation function and DIR thresholds are compromised.
Keep A-side and B-side traces short and route each 8-bit bus as a group with a continuous ground reference to minimize skew, which matters for parallel buses above roughly 10 MHz. The 24-pin TSSOP (PW) has a 0.65mm pitch; use 0.2mm-wide traces and 0.2mm clearance for reliable etch and assembly. For hot-insertion systems, rely on the Ioff and power-up 3-state features but still sequence OE after both rails are stable using an RC delay or supervisor IC, since backplane capacitance can charge through partially enabled drivers during marginal ramp conditions.
Compliance Information
AEC-Q100 qualified per TI product page and distributor listings. RoHS compliant and lead-free per datasheets.com and Arrow listings. REACH, halogen-free and conflict-minerals declarations should be confirmed on the TI product page.
