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Renesas ISL95811WFRTZ
- Part No.:
- ISL95811WFRTZ
- Manufacturer:
- Renesas
- Category:
- Digital Potentiometers
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
ISL95811WFRTZ.pdf
- Description:
- IC DGTL POT 10KOHM 256TAP 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,734
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Product details
Overview
ISL95811WFRTZ from Renesas (formerly Intersil) is a single-channel, I²C-compatible digitally controlled potentiometer (XDCP™) with 256-tap resolution, 10 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 is used for precision analog trimming in power supply feedback loops, sensor calibration, and programmable gain control.
For engineers reviewing the ISL95811WFRTZ datasheet, ISL95811WFRTZ pinout, ISL95811WFRTZ application, or ISL95811WFRTZ equivalent, this page delivers verified electrical specs, TDFN-8 package details, I²C timing constraints, wiper register behavior, and validated alternative options for industrial-grade analog tuning circuits.
Technical Context
The ISL95811WFRTZ implements a monolithic CMOS resistor ladder with CMOS switch matrix, enabling precise digital control of analog voltage division or rheostat operation. Its 8-bit volatile Wiper Register (WR) directly controls wiper position, while the non-volatile Initial Value Register (IVR) ensures power-up repeatability.
It supports standard-mode I²C (400 kHz max), features hardware write protection via the WP pin, and provides ratiometric temperature coefficient of ±4 ppm/°C in voltage divider mode. The device recalls IVR to WR at power-on after VPOR ≥ 2.6 V, with tD = 3 ms delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Total Resistance | 10 kΩ - defines full-scale analog range for voltage divider or rheostat use; matched tolerance ±20%. |
| Resolution | 256 taps (0.4% per step) - enables fine-grained adjustment with 1 LSB ≈ 39 mV at 10 V full scale. |
| Wiper Resistance | 70 Ω typical @ 3.3 V - low on-resistance minimizes signal path error in precision gain-setting applications. |
| Supply Range | 2.7 V to 5.5 V - supports direct interface with 3.3 V and 5 V microcontrollers without level shifting. |
| Standby Current | 10 µA max @ 5.5 V - enables ultra-low-power operation in battery-backed or always-on systems. |
| I²C Clock Frequency | 400 kHz - compatible with standard-mode I²C masters; timing parameters fully specified per JEDEC. |
| Non-volatile Endurance | 1,000,000 write cycles - supports field reconfiguration over product lifetime without wear-out concerns. |
Pinout & Package
ISL95811WFRTZ is housed in an 8-lead 3×3 mm TDFN package (RoHS-compliant, Pb-free, exposed pad internally connected to GND). Thermal resistance θJA = 52 °C/W enables reliable operation up to +125°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - WP | Hardware write protect input | Active-low; disables all I²C writes when pulled LOW - prevents accidental EEPROM corruption during system reset or noise events. |
| 2 - SCL | I²C clock input | Open-drain compatible; requires external pull-up; defines serial transaction timing and synchronizes register access. |
| 3 - SDA | I²C bidirectional data line | Open-drain; transmits device ID, address, and data; requires external pull-up; supports ACK/NACK handshaking. |
| 4 - GND | Analog/digital ground reference | Common return for DCP array, logic interface, and EPAD; must be low-impedance for noise immunity and thermal dissipation. |
| 5 - RW | Wiper terminal | Movable contact point; output of voltage divider or adjustable node in rheostat mode; wiper resistance ≤ 200 Ω max. |
| 6 - RL | Low terminal of DCP | Fixed end of resistor ladder; connects to system ground or low-side reference in trimming applications. |
| 7 - RH | High terminal of DCP | Fixed end of resistor ladder; connects to regulated supply or high-side reference; defines full-scale voltage range. |
| 8 - VCC | Power supply input | Supplies both logic interface and DCP array; decoupling capacitor required near pin for stable analog performance. |
Key Features
| Feature | Design Value |
|---|---|
| 256-tap XDCP with monotonicity | Guaranteed monotonic DNL ≤ ±0.75 LSB - eliminates output glitches during wiper stepping in closed-loop systems. |
| Non-volatile wiper recall | IVR auto-loaded to WR at power-up - ensures repeatable startup bias without host MCU initialization overhead. |
| 5-byte GP EEPROM | Independent non-volatile storage for calibration coefficients or configuration flags - reduces need for external memory. |
| Low-noise wiper | -110 dBV noise floor @ 1 kHz - preserves SNR in audio, sensor front-end, and precision instrumentation paths. |
| Extended temp range | -40°C to +125°C operation - qualified for automotive under-hood, industrial motor drives, and telecom infrastructure. |
Applications
| Power Supply Feedback Trimming | Sensor Offset Calibration |
|---|---|
|
Use Scenario: Adjusting the feedback divider ratio of a DC-DC converter to maintain precise output voltage across line/load/temperature variations. IC Role / Device Role / Timing Role: Digitally programmable resistor replacing mechanical trimpot; sets VOUT = VREF × (1 + RH/RL) in voltage divider mode. Use Value: Enables factory or field calibration without soldering; 10 kΩ value matches common feedback network impedances; ±20% RTOTAL tolerance accommodates layout variance. |
Use Scenario: Compensating fixed offset errors in analog sensor outputs (e.g., pressure, temperature, current sense) before ADC digitization. IC Role / Device Role / Timing Role: Rheostat-mode variable resistor in op-amp summing junction or bridge nulling circuit. Use Value: 70 Ω typical wiper resistance minimizes injection error; 256-step resolution achieves <1 mV offset correction at 3.3 V; non-volatile storage retains calibration across power cycles. |
| Programmable Gain Amplifier | LED Brightness Control |
|
Use Scenario: Setting gain of an inverting or non-inverting op-amp stage via digital control, e.g., in automatic gain control (AGC) or configurable test equipment. IC Role / Device Role / Timing Role: Two-terminal variable resistor (RW–RL or RW–RH) defining feedback or input impedance in op-amp configurations. Use Value: Ratiometric TCV of ±4 ppm/°C ensures stable gain over temperature; 400 kHz I²C allows real-time gain updates during operation without interrupting signal path. |
Use Scenario: Adjusting current-limiting resistance in constant-current LED driver circuits to set luminance levels across multiple fixtures or color channels. IC Role / Device Role / Timing Role: Rheostat controlling LED string current; placed in series with cathode or anode path. Use Value: 10 kΩ total resistance supports mA-range LED currents with minimal self-heating; 1,000,000 endurance cycles allow daily brightness tuning over 27 years. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digitally controlled potentiometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL95810WFRTZ | Same 10 kΩ, 256-tap XDCP in TDFN-8, but lacks 5-byte GP EEPROM and has no write-protect pin. | Not suitable where non-volatile calibration storage or hardware write lockout is required. | Select when only basic wiper control is needed and cost reduction is prioritized over memory and protection features. |
| AD5171BRMZ-10 | 10 kΩ, 256-tap I²C DCP from Analog Devices; includes EEPROM but uses different I²C address scheme and lacks dedicated WP pin. | Requires firmware adaptation for address mapping and software-based write protection instead of hardware WP. | Choose if existing ADI ecosystem integration or alternate qualification path is preferred; verify IVR recall timing against ISL95811WFRTZ's 3 ms tD. |
Compared with ISL95811WFRTZ, ISL95810WFRTZ removes EEPROM and WP functionality for lower cost, while AD5171BRMZ-10 offers comparable specs but demands I²C address and protection logic redesign - making ISL95811WFRTZ optimal for systems needing integrated memory, hardware write lock, and guaranteed power-up repeatability.
Availability
ISL95811WFRTZ is available at Aetrix Electronics and suitable for industrial power management, sensor calibration, programmable gain amplification, and LED current control requiring stable component supply across extended temperature ranges.
Supply support for ISL95811WFRTZ 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 its precision analog portfolio, emphasizing high-reliability, extended-temperature ICs for industrial and automotive markets.
The ISL95811WFRTZ belongs to the XDCP™ family of digitally controlled potentiometers, designed specifically for replacing mechanical trimmers in harsh-environment analog tuning applications where programmability, repeatability, and non-volatility are critical.
FAQ
What is the power-up behavior of the ISL95811WFRTZ?
At power-on, the ISL95811WFRTZ resets the Wiper Register (WR) to 0x80 (mid-scale), then loads the stored value from the non-volatile Initial Value Register (IVR) into WR once VCC exceeds VPOR (min 1.8 V). This recall completes within 3 ms, ensuring deterministic wiper position without host intervention. The ISL95811WFRTZ thus guarantees repeatable analog startup behavior across power cycles.
Does the ISL95811WFRTZ support both voltage divider and rheostat modes?
Yes, the ISL95811WFRTZ supports both configurations: as a three-terminal voltage divider (RH–RW–RL) for adjustable reference generation, and as a two-terminal rheostat (RW–RL or RW–RH) for variable resistance in current-setting or gain-control paths. Its monotonic DNL ≤ ±0.75 LSB and low 70 Ω wiper resistance ensure stable performance in either mode, confirmed across -40°C to +125°C.
How does the WP pin function on the ISL95811WFRTZ?
The WP pin on the ISL95811WFRTZ is an active-low hardware write protect. When held LOW, it blocks all I²C write operations-including volatile WR updates and non-volatile IVR/GP register writes-regardless of command validity. This prevents unintended configuration changes during power transitions or EMI events. The ISL95811WFRTZ enters standby mode instead of acknowledging writes when WP is asserted.
What is the maximum I²C clock frequency supported by the ISL95811WFRTZ?
The ISL95811WFRTZ supports standard-mode I²C up to 400 kHz, with fully characterized timing parameters including tLOW = 1300 ns, tHIGH = 600 ns, and tAA = 900 ns. It complies with I²C bus specifications for rise/fall times (tR/tF ≤ 250 ns) and capacitive loading (Cb ≤ 400 pF), ensuring interoperability with common microcontroller I²C peripherals without additional buffering.
Is the ISL95811WFRTZ pin-compatible with other members of the ISL958xx family?
No - the ISL95811WFRTZ uses the 8-lead 3×3 mm TDFN package (L8.3x3A), while ISL95811WFUZ uses 8-lead MSOP (MDP0043). Though electrically identical in function, the packages differ in footprint, thermal pad layout, and soldering profile. Migration requires PCB redesign; the ISL95811WFRTZ is not a drop-in replacement for MSOP variants, and vice versa.
ISL95811WFRTZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- XDCP™
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Taper:
- Linear
- Configuration:
- Potentiometer
- Number of Circuits:
- 1
- Number of Taps:
- 256
- Resistance (Ohms):
- 10k
- 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-TDFN (3x3)
- Operating Temperature:
- -40°C ~ 125°C
- Resistance - Wiper (Ohms) (Typ):
- 70
ISL95811WFRTZ FAQ
1.How can I place an order for ISL95811WFRTZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL95811WFRTZ 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 ISL95811WFRTZ reliable?
The price and inventory of ISL95811WFRTZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL95811WFRTZ is usually 5 days.
3.What payment methods are accepted for ISL95811WFRTZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL95811WFRTZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL95811WFRTZ?
ISL95811WFRTZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL95811WFRTZ 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 ISL95811WFRTZ?
For technical support, including ISL95811WFRTZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL95811WFRTZ requirements.
6.How does Aetrix verify that ISL95811WFRTZ is sourced from the original manufacturer or authorized distributors?
All ISL95811WFRTZ 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 ISL95811WFRTZ meets industry standards.
7.What is the process for return or replacement of ISL95811WFRTZ?
All ISL95811WFRTZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL95811WFRTZ, 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 ISL95811WFRTZ part is unused and in its original packaging.
Return procedure for ISL95811WFRTZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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