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Texas Instruments LSF0108QPWRQ1
- Part No.:
- LSF0108QPWRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
LSF0108QPWRQ1.pdf
- Description:
- IC TRANSLATOR BIDIR 20TSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LSF0108QPWRQ1 from Texas Instruments is an AEC-Q100 qualified automotive 8-channel bidirectional multi-voltage level translator IC. It enables voltage translation between 0.65 V ↔ 1.8/2.5/3.3/5 V (RKS only), 0.95 V ↔ 1.8–5 V, and 1.2–3.3 V ↔ higher rails without direction control, supports up to 100 MHz down-translation at ≤30-pF load, and operates from –40°C to +125°C in TSSOP-20 (PW) or VQFN-20 (RKS) packages.
For engineers reviewing the LSF0108QPWRQ1 datasheet, LSF0108QPWRQ1 pinout, LSF0108QPWRQ1 application, or LSF0108QPWRQ1 equivalent, key selection considerations include its auto-bidirectional operation, channel-specific reference voltage support (Vref_A/Vref_B), EN-controlled high-impedance state, 5-V-tolerant I/Os, and wettable-flank VQFN option for AOI-compatible solder joint inspection.
Technical Context
The LSF0108QPWRQ1 implements passive FET-based switch architecture with no internal level-shifting buffers - translation relies on external pull-up resistors and controlled on-resistance (RON). Its dual-reference design allows independent Vref_A (0.65–5.5 V, RKS only; 0.95–5.5 V, PW) and Vref_B (1.8–5.5 V) supplies per channel group, enabling mixed-rail interfaces like 1.8 V I²C to 3.3 V PMBus.
Operation is governed by real-time voltage comparison: when either A-side or B-side port is driven LOW, the corresponding FET switch turns ON (low RON ≈ 3–15 Ω depending on rail combination), establishing a low-impedance path; when both sides are HIGH, the switch turns OFF and clamps the low-voltage side to Vref_A. EN pin ties directly to Vref_B and requires biasing via 200-kΩ resistor to enable translation or drive LOW for Hi-Z mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 8 independent bidirectional data channels (A1–A8 / B1–B8) |
| Max Translation Speed | 100 MHz down-translation (≤30-pF load); 40 MHz up/down (50-pF load) |
| Vref_A Range | 0.95 V to 5.5 V (PW package); supports 0.65 V only in RKS package |
| Vref_B Range | 1.8 V to 5.5 V across both packages |
| On-State Resistance | 3 Ω typical (Vref_A = 3.3 V, Vref_B = 5 V, IO = 32 mA, PW package) |
| ESD Rating | HBM ±2000 V, CDM ±1000 V (AEC-Q100 qualified) |
| Operating Temp | –40°C to +125°C ambient, junction-rated to 150°C |
Pinout & Package
LSF0108QPWRQ1 is available in PW (TSSOP-20) package, 6.5 mm × 6.4 mm, with wettable flanks not supported in this variant. Pin numbering follows standard TSSOP top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Common return path for all internal switches and bias circuitry; must be low-inductance connection |
| Vref_A (Pin 2) | Low-side reference supply | Sets clamping voltage for A-side I/Os; determines minimum logic HIGH threshold on A ports |
| A1–A8 (Pins 3–10) | Low-voltage data I/O | Bidirectional signal terminals tied to Vref_A domain; tolerate 5 V when Vref_A ≤ 3.3 V |
| B1–B8 (Pins 11–18) | High-voltage data I/O | Bidirectional signal terminals tied to Vref_B domain; 5-V tolerant regardless of Vref_B |
| Vref_B (Pin 19) | High-side reference supply | Sets operating point for B-side drivers; must be ≥ Vref_A + 0.6 V for translation |
| EN (Pin 20) | Enable control input | Must be tied directly to Vref_B and pulled up via 200-kΩ resistor; LOW forces all I/Os into Hi-Z |
Key Features
| Feature | Design Value |
|---|---|
| Auto-bidirectional translation | Eliminates DIR pin requirement - detects direction dynamically via voltage differential, simplifying I²C/SMBus GPIO routing |
| Channel-specific voltage mapping | Each A/B pair independently configurable via Vref_A/Vref_B; enables mixed-interface systems (e.g., 1.8 V sensor + 3.3 V MCU) |
| Hot-insertion support | Hi-Z state on power-up/power-down (via EN control) prevents bus contention during live insertion into backplane or module systems |
| Low signal distortion | RON < 10 Ω (typical) and <1.5 ns propagation delay ensure integrity for 40+ MHz digital signals with minimal rise/fall time degradation |
| Wettable flank option (RKS only) | VQFN-20 package includes side-wettable leads for automated optical inspection (AOI) of solder fillets - not applicable to PW (TSSOP) variant |
Applications
| Infotainment & Cluster | Body Electronics & Lighting |
|---|---|
Use Scenario: Interfacing 1.8 V display controller with 3.3 V audio processor and 5 V CAN transceiver in central infotainment unit. IC Role / Device Role / Timing Role: Bidirectional level translator for I²C and GPIO lines between mixed-supply subsystems. Use Value: Enables single-chip translation across three voltage domains without direction control or timing skew penalties. | Use Scenario: Connecting 0.95 V microcontroller GPIOs to 12 V LED driver inputs and 5 V LIN transceivers in door module. IC Role / Device Role / Timing Role: Voltage translator for PWM dimming signals and status feedback on shared bus lines. Use Value: Supports 40 MHz PWM edge rates while maintaining <1.5 ns channel-to-channel skew across all 8 channels. |
| ADAS Camera Interface | Hybrid Powertrain Control |
Use Scenario: Bridging MIPI D-PHY sub-lanes (1.2 V) to 3.3 V image signal processor in rear-view camera ECU. IC Role / Device Role / Timing Role: Low-distortion bidirectional translator for clock and data lanes in camera link interface. Use Value: Maintains signal integrity at 100 MHz down-translation with ≤30-pF trace capacitance, meeting ADAS latency requirements. | Use Scenario: Isolating 1.8 V battery management system (BMS) MCU from 5 V motor control gateway over SMBus. IC Role / Device Role / Timing Role: Automotive-grade level shifter for fault-reporting and configuration commands in safety-critical powertrain network. Use Value: AEC-Q100 qualification and –40°C to +125°C operation ensure reliability under under-hood thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional level translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LSF0204QPWRQ1 | 4-channel version; identical architecture, same Vref_A/Vref_B ranges and speed specs; smaller TSSOP-14 package | Suitable where fewer channels reduce PCB area and cost; not scalable to 8-signal buses | Select when system requires ≤4 bidirectional lines and space-constrained layout |
| TXS0108EQPWRQ1 | Buffer-based (not switch-based); includes internal charge pump; supports 1.2–3.6 V → 1.65–5.5 V; higher ICC (20 µA vs. 0.05 µA) | Better for weak-drive or high-capacitance buses; less suitable for ultra-low-power always-on nodes | Choose when driving >50-pF loads or when external pull-ups cannot be used |
Compared with LSF0204QPWRQ1, the LSF0108QPWRQ1 provides double the channel count in same footprint family but consumes identical quiescent current; versus TXS0108EQPWRQ1, it delivers lower power and tighter propagation delay control but requires careful external pull-up design and cannot drive high-capacitance buses without signal degradation.
Availability
LSF0108QPWRQ1 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera links, body electronics modules, and hybrid powertrain control systems requiring stable component supply across extended temperature and AEC-Q100-compliant production cycles.
Supply support for LSF0108QPWRQ1 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 delivering analog and embedded processing solutions, with deep expertise in automotive-grade IC design, functional safety, and long-term product longevity.
The LSF0108QPWRQ1 belongs to TI's LSF family of auto-bidirectional level translators, engineered specifically for automotive mixed-voltage interface bridging - targeting I²C, SMBus, PMBus, MDIO, and GPIO interconnects in harsh-temperature, safety-conscious environments.
FAQ
What is the maximum capacitive load supported by LSF0108QPWRQ1 at 100 MHz translation speed?
The LSF0108QPWRQ1 supports up to 100 MHz down-translation only when the total capacitive load (including trace + receiver input) is ≤30 pF. At 50-pF load, maximum reliable speed drops to 40 MHz for both up- and down-translation. Exceeding these limits increases propagation delay variation and may cause setup/hold violations in high-speed interfaces like SDIO or MDIO. The LSF0108QPWRQ1 datasheet specifies these values under switching characteristics tables 6.7 and 6.8.
Can LSF0108QPWRQ1 translate between 0.65 V and 3.3 V logic levels?
No - the 0.65 V Vref_A capability applies exclusively to the RKS (VQFN-20) package variant of the LSF0108-Q1 family. The LSF0108QPWRQ1 uses the PW (TSSOP-20) package, which supports Vref_A from 0.95 V to 5.5 V only. Therefore, LSF0108QPWRQ1 cannot operate with Vref_A = 0.65 V; minimum valid Vref_A is 0.95 V. This distinction is explicitly stated in revision history and electrical characteristics sections of the TI datasheet SDLS967H.
How should the EN pin be configured for proper operation of LSF0108QPWRQ1?
The EN pin of LSF0108QPWRQ1 must be tied directly to Vref_B and pulled up to Vref_B through a 200-kΩ bias resistor. This ensures the device enters active translation mode when Vref_B is powered. Driving EN LOW places all A/B I/Os in high-impedance state - critical for hot-plug scenarios. EN must never be left floating or driven by logic-level signals incompatible with Vref_B; incorrect EN biasing causes undefined channel behavior or failure to translate. This configuration is mandatory per Section 8.3.2 of the LSF0108QPWRQ1 datasheet.
Does LSF0108QPWRQ1 require external pull-up resistors, and if so, where?
Yes - LSF0108QPWRQ1 requires external pull-up resistors on the B-side (high-voltage side) for all up-translation scenarios, and optionally on the A-side if interfacing with open-drain drivers or receivers with >1 µA leakage. Pull-ups are not needed on the A-side for push-pull-to-push-pull down-translation with low-leakage receivers. Resistor value impacts max speed: 250 Ω enables ~100 MHz with 30-pF load, while 1 kΩ limits to ~40 MHz at 50-pF. These guidelines are detailed in Section 8.4.1 and Figure 8-3 of the LSF0108QPWRQ1 datasheet.
Is LSF0108QPWRQ1 pin-compatible with other members of the LSF-Q1 family?
LSF0108QPWRQ1 shares identical pinout and function mapping with LSF0108RKSQ1 (VQFN-20), including GND, Vref_A, A1–A8, B1–B8, Vref_B, and EN assignments. However, it is not pin-compatible with 4-channel variants (e.g., LSF0204QPWRQ1 uses TSSOP-14) or buffer-based alternatives (e.g., TXS0108EQPWRQ1 has different EN and VCC pin placements). Always verify package mechanical drawings and signal mapping before PCB reuse - the LSF0108QPWRQ1 pin configuration is defined in Figure 5-1 of its datasheet.
LSF0108QPWRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Translator Type:
- Voltage Level
- Channel Type:
- Bidirectional
- Number of Circuits:
- 1
- Channels per Circuit:
- 8
- Voltage - VCCA:
- 0.95 V ~ 4.5 V
- Voltage - VCCB:
- 1.8 V ~ 5.5 V
- Input Signal:
- -
- Output Signal:
- -
- Output Type:
- Open Drain, Push-Pull
- Data Rate:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- -
- Features:
- Auto-Direction Sensing
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP (0.173", 4.40mm Width)
LSF0108QPWRQ1 FAQ
1.How can I place an order for LSF0108QPWRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LSF0108QPWRQ1 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 LSF0108QPWRQ1 reliable?
The price and inventory of LSF0108QPWRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LSF0108QPWRQ1 is usually 5 days.
3.What payment methods are accepted for LSF0108QPWRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LSF0108QPWRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LSF0108QPWRQ1?
LSF0108QPWRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LSF0108QPWRQ1 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 LSF0108QPWRQ1?
For technical support, including LSF0108QPWRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LSF0108QPWRQ1 requirements.
6.How does Aetrix verify that LSF0108QPWRQ1 is sourced from the original manufacturer or authorized distributors?
All LSF0108QPWRQ1 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 LSF0108QPWRQ1 meets industry standards.
7.What is the process for return or replacement of LSF0108QPWRQ1?
All LSF0108QPWRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LSF0108QPWRQ1, 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 LSF0108QPWRQ1 part is unused and in its original packaging.
Return procedure for LSF0108QPWRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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