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Renesas ISL95811UFUZ
- Part No.:
- ISL95811UFUZ
- Manufacturer:
- Renesas
- Category:
- Digital Potentiometers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ISL95811UFUZ.pdf
- Description:
- IC DGTL POT 50KOHM 256TAP 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,561
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Product details
Overview
ISL95811UFUZ from Renesas (formerly Intersil) is a single-channel, I²C-compatible digitally controlled potentiometer (XDCP™) with 256-tap resolution, 50 kΩ end-to-end resistance, non-volatile wiper position storage, and integrated 5-byte general-purpose EEPROM. It operates from 2.7V to 5.5V and supports industrial temperature range (−40°C to +125°C), enabling precise analog trimming in power supply feedback loops, sensor calibration circuits, and programmable gain stages.
For engineers reviewing the ISL95811UFUZ datasheet, ISL95811UFUZ pinout, ISL95811UFUZ application, or ISL95811UFUZ equivalent, key selection criteria include its 50 kΩ total resistance option, MSOP-8 package, ±0.5 LSB DNL in voltage divider mode, 70 Ω typical wiper resistance at 3.3 V, and hardware write protection via WP pin.
Technical Context
The ISL95811UFUZ implements a monolithic CMOS resistor ladder with CMOS switch matrix, supporting both three-terminal potentiometer and two-terminal rheostat configurations. Its wiper position is controlled by an 8-bit volatile Wiper Register (WR), which loads the non-volatile Initial Value Register (IVR) at power-up.
It features I²C interface compliance with 400 kHz maximum clock frequency, open-drain SDA/SCL with external pull-ups, and hardware write protection via active-low WP pin. The device integrates five general-purpose non-volatile bytes and guarantees 1,000,000 write cycles and 50-year data retention at ≤+55°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Total Resistance | 50 kΩ - defines maximum adjustable resistance between RH and RL terminals; selected for higher-impedance biasing and low-current trimming applications. |
| Resolution | 256 taps (8-bit) - enables 0.4% step resolution; supports fine-grained analog adjustments without DAC interpolation. |
| Wiper Resistance | 70 Ω typical @ 3.3 V - limits insertion loss and signal distortion when used as variable resistor in signal paths. |
| DNL (Voltage Divider) | ±0.5 LSB - ensures monotonic output and predictable linearity across all tap positions for closed-loop control stability. |
| Supply Range | 2.7 V to 5.5 V - compatible with both 3.3 V and 5 V logic/system rails without level-shifting. |
| Standby Current | 10 µA max @ 5.5 V - enables low-power operation in battery-backed or always-on monitoring systems. |
| I²C Clock Frequency | 400 kHz - supports standard-mode Fast I²C, allowing integration into existing microcontroller-based configuration buses. |
| Temperature Range | −40°C to +125°C - qualified for extended industrial environments including automotive under-hood and industrial motor drives. |
Pinout & Package
ISL95811UFUZ is packaged in an 8-lead MSOP (Mini Small Outline Package), Pb-free and RoHS-compliant, with dimensions 3.0 mm × 4.9 mm × 1.1 mm (MDP0043 drawing). Exposed pad is internally connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (WP) | Hardware Write Protect | Active-low input that disables all I²C write operations-including non-volatile memory writes-when pulled low; prevents accidental configuration changes during system operation. |
| 2 (SCL) | I²C Serial Clock Input | Asynchronous clock input for I²C communication; requires external pull-up; timing-critical for 400 kHz operation and ACK generation. |
| 3 (SDA) | I²C Serial Data I/O | Open-drain bidirectional data line; requires external pull-up; carries device address, register addresses, and data bytes per I²C protocol. |
| 4 (GND) | Ground Reference | Primary return path for digital and analog circuitry; must be low-impedance and tied to system ground plane for noise immunity. |
| 5 (RW) | Wiper Terminal | Movable terminal of the DCP; connects to intermediate node of resistor ladder; output voltage varies linearly with WR register value in divider mode. |
| 6 (RL) | Low Terminal | Fixed terminal referenced to lowest potential in potentiometer configuration; forms one end of the 50 kΩ resistive element. |
| 7 (RH) | High Terminal | Fixed terminal referenced to highest potential in potentiometer configuration; forms other end of the 50 kΩ resistive element. |
| 8 (VCC) | Power Supply | Single positive supply input (2.7–5.5 V); powers internal logic, memory, and resistor ladder; decoupling capacitor required near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Non-volatile wiper recall | Automatically restores last programmed wiper position from IVR at power-up-eliminates need for host MCU reinitialization in fault-recovery or cold-start scenarios. |
| 5-byte GP EEPROM | Provides user-configurable storage for calibration coefficients, serial numbers, or board-specific settings-reduces BOM count by replacing discrete EEPROM. |
| ±0.5 LSB DNL (U-option) | Ensures monotonicity and minimal step error in voltage divider mode-critical for stable feedback in DC-DC converter compensation networks. |
| 70 Ω typical wiper resistance | Minimizes loading effect on high-impedance nodes (e.g., op-amp inputs or reference dividers), preserving signal integrity and accuracy. |
| Hardware WP pin | Enables fail-safe write protection independent of firmware state-prevents corruption during brown-out, reset, or software glitch conditions. |
| 250 kHz fCUTOFF (U-option) | Supports bandwidth-sensitive applications like audio-level control or sensor offset trimming where signal fidelity up to ~250 kHz must be preserved. |
Applications
| DC-DC Converter Feedback Trimming | Sensor Offset Calibration |
|---|---|
|
Use Scenario: Adjusting the resistive divider ratio in the feedback path of a buck/boost regulator to dynamically tune output voltage during system runtime. IC Role / Device Role / Timing Role: Digitally programmable resistor replacing fixed feedback network; wiper position set via I²C during power-up or thermal compensation routines. Use Value: Enables factory-programmed output voltage variants on same PCB; eliminates manual trimmer replacement and supports adaptive voltage scaling. |
Use Scenario: Compensating zero-point drift in precision analog sensors (e.g., pressure transducers, thermistors) by injecting calibrated offset into signal conditioning stage. IC Role / Device Role / Timing Role: Two-terminal rheostat configured between op-amp input and reference; wiper position updated once per calibration cycle via host MCU. Use Value: Achieves <±0.1% offset correction over −40°C to +125°C using stored IVR values-no external DAC or microcontroller ADC required. |
| Programmable Gain Amplifier | LED Current Bias Adjustment |
|
Use Scenario: Setting gain of instrumentation amplifier by configuring feedback resistor ratio using ISL95811UFUZ in three-terminal potentiometer mode. IC Role / Device Role / Timing Role: Voltage divider with RH = VREF, RL = GND, RW = amplifier input; wiper position determines attenuation before gain stage. Use Value: Provides 256 discrete, repeatable gain steps with <±0.5 LSB INL-enables auto-ranging and dynamic sensitivity switching in data acquisition systems. |
Use Scenario: Fine-tuning LED forward current in backlight or indicator circuits by adjusting series bias resistance in constant-current source path. IC Role / Device Role / Timing Role: Rheostat between current-sense resistor and op-amp input in transconductance loop; wiper position sets current setpoint. Use Value: Delivers stable, flicker-free dimming with <1% current variation across temperature-avoids thermal runaway in high-brightness LED arrays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digitally controlled potentiometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL95810UFUZ | Same 50 kΩ resistance, identical MSOP-8 package, but lacks 5-byte GP EEPROM and has no hardware WP pin. | Not suitable for systems requiring field-programmable calibration storage or robust write protection; limited to basic wiper control only. | Select when EEPROM and WP functionality are unnecessary and cost reduction is prioritized over configurability. |
| AD5175BRMZ-50 | 50 kΩ, 256-tap, SPI interface (not I²C), 20 ppm/°C TCR, no GP memory, 45 Ω wiper resistance. | Requires SPI host interface and different layout routing; lower wiper resistance benefits low-impedance loads but offers no non-volatile storage beyond wiper. | Choose for SPI-based platforms needing tighter TCR and lower wiper R, accepting loss of I²C compatibility and EEPROM capability. |
Compared with ISL95811UFUZ, ISL95810UFUZ removes EEPROM and WP for lower cost and simpler control, while AD5175BRMZ-50 trades I²C for SPI and omits GP memory but improves thermal stability and wiper resistance-making each alternative optimal only under specific interface, memory, or precision constraints.
Availability
ISL95811UFUZ is available at Aetrix Electronics and suitable for DC-DC converter trimming, sensor calibration, programmable gain amplification, and LED bias adjustment requiring stable component supply across extended temperature and long product lifecycles.
Supply support for ISL95811UFUZ 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
Renesas Electronics acquired Intersil in 2017 and maintains full technical and supply chain continuity for legacy Intersil precision analog products.
The ISL95811UFUZ belongs to the XDCP™ (eXternally Digitally Controlled Potentiometer) family, designed specifically for replacing mechanical trimmers in high-reliability industrial, automotive, and telecom systems where programmability, non-volatility, and long-term stability are critical.
FAQ
What is the total resistance value of the ISL95811UFUZ?
The ISL95811UFUZ has a nominal end-to-end resistance of 50 kΩ between RH and RL terminals, as confirmed by the Ordering Information table and Analog Specifications section of FN6759 Rev 1.00. This value is fixed for the "U" variant and distinct from the 10 kΩ "W" option.
Does the ISL95811UFUZ retain its wiper setting after power cycling?
Yes, the ISL95811UFUZ retains its wiper position after power cycling by loading the value stored in the non-volatile Initial Value Register (IVR) into the volatile Wiper Register (WR) during power-up. This behavior is explicitly defined in the Principles of Operation and Block Diagram sections of the datasheet.
Can the ISL95811UFUZ be used in rheostat mode?
Yes, the ISL95811UFUZ supports rheostat (two-terminal variable resistor) mode by connecting either RH or RL to the wiper (RW) and using the remaining terminal as the adjustable node. Performance specifications-including ±0.5 MI RDNL and ±1 MI RINL-are provided for this configuration in the datasheet.
What is the function of the WP pin on the ISL95811UFUZ?
The WP (Write Protect) pin on the ISL95811UFUZ is an active-low hardware lock that disables all I²C write operations-including volatile and non-volatile register writes-when held low. This feature prevents unintended configuration changes during system operation or power transitions.
Is the ISL95811UFUZ pin-compatible with other members of the ISL95811 family?
Yes, all ISL95811 variants-including ISL95811UFUZ, ISL95811WFUZ, and ISL95811UFRTZ-share identical 8-lead MSOP or TDFN pinouts and electrical pin functions. The only differences are total resistance (50 kΩ vs. 10 kΩ) and package type; no PCB redesign is needed when substituting within the same package footprint.
ISL95811UFUZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- XDCP™
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Taper:
- Linear
- Configuration:
- Potentiometer
- Number of Circuits:
- 1
- Number of Taps:
- 256
- Resistance (Ohms):
- 50k
- Interface:
- I2C
- Memory Type:
- Non-Volatile
- Voltage - Supply:
- 2.7V ~ 5.5V
- Features:
- -
- Tolerance:
- ±20%
- Temperature Coefficient (Typ):
- ±45ppm/°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-MSOP
- Operating Temperature:
- -40°C ~ 125°C
- Resistance - Wiper (Ohms) (Typ):
- 70
ISL95811UFUZ FAQ
1.How can I place an order for ISL95811UFUZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL95811UFUZ 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 ISL95811UFUZ reliable?
The price and inventory of ISL95811UFUZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL95811UFUZ is usually 5 days.
3.What payment methods are accepted for ISL95811UFUZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL95811UFUZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL95811UFUZ?
ISL95811UFUZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL95811UFUZ 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 ISL95811UFUZ?
For technical support, including ISL95811UFUZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL95811UFUZ requirements.
6.How does Aetrix verify that ISL95811UFUZ is sourced from the original manufacturer or authorized distributors?
All ISL95811UFUZ 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 ISL95811UFUZ meets industry standards.
7.What is the process for return or replacement of ISL95811UFUZ?
All ISL95811UFUZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL95811UFUZ, 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 ISL95811UFUZ part is unused and in its original packaging.
Return procedure for ISL95811UFUZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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