LSF0108QPWRQ1 - Auto 8-Ch Bidirectional Level Shifter | TI
MPN: LSF0108QPWRQ1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.28 | $1.28 |
| 10 | $1.15 | $11.50 |
| 100 | $0.94 | $94.00 |
| 500 | $0.78 | $390.00 |
| 1,000 | $0.62 | $620.00 |
Drop-in alternatives for LSF0108QPWRQ1 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LSF0108PWR
✅ Drop-In✓ In Stock
$0.3 / Unit
View Datasheet →TXS0108EQPWRQ1
⚡ Same Package✓ In Stock
$0.39 / Unit
View Datasheet →TXB0108QPWRQ1
⚡ Same Package✓ In Stock
$0.68 / Unit
View Datasheet →TXS0108EPWR
⚡ Same Package✓ In Stock
$0.42 / Unit
View Datasheet →TXB0108PWR
⚡ Same Package✓ In Stock
$0.18 / Unit
View Datasheet →LSF0108QPWRQ1 Maximum Ratings & Electrical Characteristics
| Function | 8-channel bidirectional multi-voltage level translator |
| Channels | 8 |
| Translator Type | Voltage level, bidirectional, no direction pin |
| Input Voltage Range (VCCA) | 0.95 V to 4.5 V |
| Translation Range | 0.95 V to 5 V |
| Up-Translation Speed | up to 100 MHz (<=30 pF load) |
| Down-Translation Speed | greater than 100 MHz (<=30 pF load) |
| Speed at 50 pF Load | 40 MHz up/down |
| Signal Type Support | Open-drain and push-pull |
| Supply Type | Dual supply (VREF_A, VREF_B) |
| Operating Temperature | -40C to +125C |
| Qualification | AEC-Q100 automotive grade |
| Package | TSSOP (PW), 20 pins |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Series | LSF0108-Q1 |
LSF0108QPWRQ1 Pin Configuration
| Pin 1 | A1 — Channel 1, VREF_A side I/O |
| Pin 2 | A2 — Channel 2, VREF_A side I/O |
| Pin 3 | A3 — Channel 3, VREF_A side I/O |
| Pin 4 | A4 — Channel 4, VREF_A side I/O |
| Pin 5 | GND — Ground |
| Pin 6 | A5 — Channel 5, VREF_A side I/O |
| Pin 7 | A6 — Channel 6, VREF_A side I/O |
| Pin 8 | A7 — Channel 7, VREF_A side I/O |
| Pin 9 | A8 — Channel 8, VREF_A side I/O |
| Pin 10 | VREF_A — Low-voltage reference supply (0.95V-4.5V) |
| Pin 11 | EN — Enable input (high = pass gates on) |
| Pin 12 | VREF_B — High-voltage reference supply |
| Pin 13 | B8 — Channel 8, VREF_B side I/O |
| Pin 14 | B7 — Channel 7, VREF_B side I/O |
| Pin 15 | B6 — Channel 6, VREF_B side I/O |
| Pin 16 | B5 — Channel 5, VREF_B side I/O |
| Pin 17 | B4 — Channel 4, VREF_B side I/O |
| Pin 18 | B3 — Channel 3, VREF_B side I/O |
| Pin 19 | B2 — Channel 2, VREF_B side I/O |
| Pin 20 | B1 — Channel 1, VREF_B side I/O |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
LSF0108QPWRQ1 is suitable for 6 applications: Automotive Body Control Modules, MDIO Management Buses, I2C Sensor Interfaces, Automotive Infotainment, Mixed-Voltage Industrial Automation, Camera and Video Module Interfaces.
Automotive Body Control Modules
The LSF0108QPWRQ1's AEC-Q100 qualification and -40C to +125C rating make it ideal for body control modules where 3.3V MCUs must communicate with 5V switches, relays, and lamp drivers. Its 8 bidirectional channels consolidate multiple discrete MOSFET level shifters into one TSSOP-20 package, and the absence of a direction pin means shared control GPIO lines can be repurposed. With up to 100 MHz translation capability, it far exceeds the sub-1 MHz needs of lamp and load status monitoring, giving large timing margin.
Recommended
MDIO Management Buses
Ethernet PHY MDIO management interfaces commonly run at 2.5 MHz between a 1.8V MAC and 3.3V PHYs. The LSF0108QPWRQ1 supports up to 100 MHz translation at <=30 pF load, providing generous headroom for MDIO timing, and its open-drain support handles MDIO's shared bidirectional data line correctly with proper pull-ups. TI datasheet Rev. H explicitly lists MDIO as a supported telecom/consumer interface for the LSF family, making this a reference-backed fit.
Recommended
I2C Sensor Interfaces
Mixed-voltage I2C is the LSF family's signature use case: a 1.8V sensor hub connecting to 3.3V or 5V sensors. Because the LSF pass-gate supports wired-AND open-drain signaling, I2C arbitration and clock stretching work natively when external pull-ups are fitted on each rail. The >100 MHz down-translation spec at 30 pF easily covers I2C fast-mode plus (1 MHz), and all 8 channels allow shifting SDA/SCL on multiple independent buses through one device.
Recommended
Automotive Infotainment
Infotainment head units mix 1.8V application processors, 3.3V audio codecs, and 5V peripherals on shared I2C and GPIO buses. The LSF0108QPWRQ1 shifts eight of these lines simultaneously in one TSSOP-20 footprint, and its push-pull compatibility also covers SPI and UART console links up to 100 MHz. AEC-Q100 qualification addresses the harsh cabin temperature environment, while the passive architecture draws no dynamic current, minimizing impact on standby power budgets.
Recommended
Mixed-Voltage Industrial Automation
Industrial PLC and sensor modules routinely combine legacy 5V logic with modern 3.3V and 1.8V MCUs. The LSF0108QPWRQ1 bridges 1.8V/2.5V/3.3V/5V domains on eight bidirectional lines with automatic direction sensing, eliminating direction-control firmware and its associated latency. The 100 MHz capability covers industrial SPI, UART, and GPIO expansion buses, while the -40C rating supports unheated factory floor and outdoor installations.
Recommended
Camera and Video Module Interfaces
Automotive camera modules pair 1.8V image sensor processors with 3.3V control FPGAs or ASIL MCUs. The LSF0108QPWRQ1 shifts I2C control buses and slow GPIO (power-down, reset, trigger) between domains, while its AEC-Q100 rating suits exterior camera environments. Its passive MOSFET channels introduce no added jitter or skew to trigger lines, and the 0.95V low-side capability covers the latest sub-1.2V-core sensor interface rails through proper VREF selection.
Recommended
Recommended Products Summary
Engineering reference data for LSF0108QPWRQ1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LSF0108PWR | TXS0108EQPWRQ1 | TXB0108QPWRQ1 | TXS0108EPWR |
|---|---|---|---|---|---|
| Package | TSSOP-20 (PW) | TSSOP-20 (PW) - same | TSSOP-20 (PW) - same | TSSOP-20 (PW) - same | TSSOP-20 (PW) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Architecture | Pass-gate N-MOSFET, external pull-ups | Pass-gate N-MOSFET, external pull-ups | Auto-direction, one-shot edge accelerator | Auto-direction push-pull | Auto-direction, one-shot edge accelerator |
| Open-Drain (I2C) Support | Yes | Yes | Yes (limited) | No | Yes (limited) |
| Max Speed (<=30 pF) | 100 MHz up / >100 MHz down | 100 MHz up / >100 MHz down | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
| AEC-Q100 Qualification | Yes (-40C to +125C) | No (commercial grade) | Yes | Yes | No |
| External Pull-Ups Required | Yes | Yes | No (internal 10 kohm) | No | No (internal 10 kohm) |
| Translation Range | 0.95 V to 5 V | 0.95 V to 4.5 V (VCCA) | 1.2 V to 3.6 V | 1.2 V to 3.6 V | 1.2 V to 3.6 V |
Key Differentiators
- Native open-drain support with 0.95V low side (vs TXB0108QPWRQ1)
- Wider translation range than TXS/TXB families (vs TXS0108EQPWRQ1)
- Same die available in non-automotive grade (vs LSF0108PWR)
Design Notes
Place pull-up resistors close to the LSF0108QPWRQ1 channel pins and size them for bus capacitance: for I2C fast-mode plus at 1 MHz with 50 pF bus, 1 kohm to 2 kohm pull-ups are typical; slower buses can use 4.7 kohm to 10 kohm. Tie VREF_A to the lower rail and VREF_B to the higher rail with 0.1 uF decoupling capacitors directly at pins 10 and 12. Verify VREF_B - VREF_A exceeds one N-MOSFET threshold voltage per TI datasheet Rev. H.
Do not use TXB0108 as a substitute on open-drain buses - its active push-pull drivers conflict with wired-AND signaling and will fight arbitration. Also, the LSF pass-gate is resistive in the on state; large voltage swings combined with heavy capacitive loads slow edges, so check rise-time equations against your bus speed. The EN pin must be driven high for operation; floating EN leaves channels disabled and is a frequent bring-up failure.
The LSF architecture adds no active drive, so signal integrity depends entirely on pull-up selection and bus loading. Keep trace stubs short (under 5 cm for buses above 10 MHz) and place series damping only if ringing from long traces occurs. For I2C clock stretching and arbitration, confirm pull-up strength allows the low-level sink current of the weakest device to hold VOL below 0.4V.
Compliance Information
AEC-Q100 automotive qualified per TI product page and datasheet (Rev. H). RoHS and lead-free status per DigiKey listing. REACH and halogen-free status not stated in provided data.
