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Renesas ISL23418UFUZ-TK
- Part No.:
- ISL23418UFUZ-TK
- Manufacturer:
- Renesas
- Category:
- Digital Potentiometers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ISL23418UFUZ-TK.pdf
- Description:
- IC DGTL POT 50KOHM 128TAP 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,430
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Product details
Overview
ISL23418UFUZ-TK from Renesas (formerly Intersil) is a volatile, single-channel, 128-tap digitally controlled potentiometer (XDCP™) with SPI interface, 50kΩ end-to-end resistance, 10-lead µTQFN package, and extended industrial temperature range (–40°C to +125°C). It operates from 1.7V to 5.5V analog supply (VCC) and 1.2V to 5.5V logic supply (VLOGIC), enabling direct low-voltage bus interfacing without level shifters - ideal for gain adjustment in battery-powered medical instruments and LCD bias compensation.
For engineers reviewing the ISL23418UFUZ-TK datasheet, ISL23418UFUZ-TK pinout, ISL23418UFUZ-TK application, or ISL23418UFUZ-TK equivalent, key selection considerations include its 50kΩ resistance option, 70Ω typical wiper resistance at 3.3V, shutdown mode forcing RW-to-RL short via 2kΩ internal resistor, ±3mA max wiper current, and guaranteed monotonicity in both voltage divider and rheostat modes.
Technical Context
The ISL23418UFUZ-TK implements a monolithic CMOS resistor ladder with CMOS switch matrix controlled by an 8-bit volatile Wiper Register (WR), initialized to 64 (mid-scale) at power-on. Its SPI interface operates in Mode 0 (CPOL=0, CPHA=0), with data clocked in on SCK rising edge and out on falling edge, supporting daisy-chaining of multiple DCPs using shared SCK/CS lines.
It features dual independent supplies: VCC powers the analog resistor array and wiper switches (1.7V–5.5V), while VLOGIC powers digital logic and level-shifting circuitry (1.2V–5.5V), decoupling logic compatibility from analog rail constraints. Shutdown mode (via ACR[6]) disconnects RH–RL and shorts RW to RL through ~2kΩ, reducing total current to <2.8µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Total Resistance | 50kΩ - defines full-scale analog range for voltage division or rheostat use; matched to ISL23418UFUZ-TK ordering code "U" |
| Wiper Resistance | 70Ω typical @ VCC = 3.3V - directly impacts signal path insertion loss and thermal noise in precision gain control |
| Supply Range | VCC = 1.7V–5.5V; VLOGIC = 1.2V–5.5V - enables mixed-supply systems (e.g., 1.8V MCU + 3.3V analog rail) without external level shifters |
| Temperature Range | –40°C to +125°C - qualified for under-hood automotive, industrial power supplies, and portable medical equipment |
| Shutdown Current | <2.8µA max - preserves battery life in always-on instrumentation during idle periods |
| Integral Non-linearity | ±0.15 LSB (voltage divider mode) - ensures accurate 8-bit resolution across full tap range for calibration-critical applications |
| Settling Time | 1.5µs wiper response (U option) - supports dynamic reconfiguration in closed-loop bias control loops |
Pinout & Package
ISL23418UFUZ-TK uses a 10-lead 2.1mm × 1.6mm µTQFN package (RoHS-compliant, MSL Level 3 per JEDEC J-STD-020).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VLOGIC (Pin 10) | SPI logic supply input | Decouples digital interface voltage from analog VCC; enables 1.2V microcontroller compatibility |
| SCK (Pin 1) | SPI serial clock input | Edge-triggered master clock; rising edge clocks SDI data in, falling edge clocks SDO data out |
| SDO (Pin 9) | SPI serial data output | Configurable push-pull or open-drain; tri-stated when CS high to support daisy-chain topologies |
| SDI (Pin 2) | SPI serial data input | Receives instruction/data bytes; MSB-first protocol with 3-bit opcodes and 5-bit register addresses |
| CS (Pin 3) | Active-low chip select | Enables device communication; rising edge latches write operations and triggers read data output |
| RL (Pin 4) | DCP low terminal | Analog reference node; connected internally to RW during shutdown via ~2kΩ resistor |
| RW (Pin 5) | Wiper terminal | Variable output node; position determined by 8-bit WR register; supports ±3mA continuous current |
| RH (Pin 6) | DCP high terminal | High-side analog node; voltage must remain within 0V to VCC to avoid latch-up |
| VCC (Pin 7) | Analog power supply | Powers resistor ladder and wiper switches; independent of VLOGIC for mixed-rail designs |
| GND (Pin 8) | Analog/digital ground | Common reference for all analog and digital signals; requires low-impedance PCB connection |
Key Features
| Feature | Design Value |
|---|---|
| 128-tap resolution | Provides 8-bit granularity for precise analog parameter tuning (e.g., 0.78% step size in 50kΩ span) |
| SPI daisy-chaining | Enables multi-channel DCP control with single MCU SPI port - reduces GPIO count and simplifies layout |
| Independent VLOGIC supply | Eliminates need for external level shifters when interfacing 1.2V–1.8V MCUs with 3.3V/5V analog subsystems |
| Power-on mid-scale preset | Guarantees known initial state (64-tap) at startup - prevents undefined output transients in safety-critical systems |
| Shutdown mode with RW–RL short | Forces predictable low-impedance state during sleep; avoids floating wiper that could cause leakage or oscillation |
Applications
| Power Supply Margining | RF Power Amplifier Bias |
|---|---|
Use Scenario: Adjusting feedback resistors in DC-DC converter error amplifiers to validate stability margins across voltage/temp corners. IC Role / Device Role / Timing Role: Digitally programmable voltage divider setting reference voltage for regulation loop. Use Value: Enables automated margin testing without manual resistor changes; 50kΩ value matches common feedback network impedances. |
Use Scenario: Dynamically compensating gate bias voltage of GaAs FETs in cellular base station PA stages over temperature drift. IC Role / Device Role / Timing Role: Precision rheostat controlling current into bias network of RF transistor. Use Value: 70Ω wiper resistance minimizes insertion loss; ±0.15 LSB INL ensures repeatable bias point accuracy. |
| LCD Bias Compensation | Portable Medical Equipment Calibration |
Use Scenario: Fine-tuning VCOM voltage in TFT-LCD panels to maintain contrast uniformity across operating temperature range. IC Role / Device Role / Timing Role: Low-noise voltage divider generating adjustable common-mode reference. Use Value: 1.2V–5.5V VLOGIC allows direct connection to low-power display controllers; 125°C rating covers panel heating effects. |
Use Scenario: Calibrating sensor front-end gain in handheld ECG monitors during factory production and field recalibration. IC Role / Device Role / Timing Role: Digitally reconfigurable gain-setting element in instrumentation amplifier feedback path. Use Value: Volatile WR register enables secure calibration storage in MCU flash; shutdown mode isolates analog path during standby. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digitally controlled potentiometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD5175BRMZ-50 | Non-volatile EEPROM memory; 256-tap resolution; I²C interface; 10kΩ/50kΩ/100kΩ options | Retains wiper setting after power cycle; lacks VLOGIC independence (VDD only); no shutdown mode | Choose AD5175BRMZ-50 when persistent settings are required and I²C is preferred over SPI. |
| MCP41050-I/P | Volatile 256-tap DCP; SPI interface; single 50kΩ option; 8-pin PDIP/SOIC; no VLOGIC pin | Requires level shifting for sub-2.7V logic; higher wiper resistance (120Ω typ); wider temp range (–40°C to +125°C) | Choose MCP41050-I/P for cost-sensitive, through-hole designs where VLOGIC independence is not needed. |
Compared with ISL23418UFUZ-TK, AD5175BRMZ-50 offers non-volatility but sacrifices low-voltage logic compatibility and shutdown functionality, while MCP41050-I/P provides higher resolution at lower cost but lacks the critical VLOGIC/VCC separation essential for mixed-supply battery systems.
Availability
ISL23418UFUZ-TK is available at Aetrix Electronics and suitable for power supply margining, RF amplifier bias compensation, LCD bias adjustment, and portable medical calibration requiring stable component supply across extended temperature ranges and low-power operation.
Supply support for ISL23418UFUZ-TK 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 continues to support its precision analog portfolio, including digitally controlled potentiometers, with focus on industrial, automotive, and medical applications.
The ISL23418UFUZ-TK belongs to Renesas' XDCP™ (eXternally Digital Controlled Potentiometer) family, designed specifically for replacing mechanical potentiometers in automated calibration, adaptive biasing, and low-power analog trimming systems.
FAQ
What is the total resistance value of the ISL23418UFUZ-TK?
The ISL23418UFUZ-TK has a nominal end-to-end resistance of 50kΩ, as indicated by the "U" in its part number per the Ordering Information table. This value is specified with ±2% tolerance over temperature and is optimized for precision voltage division and rheostat configurations in battery-powered instrumentation.
Does the ISL23418UFUZ-TK retain its wiper position after power cycling?
No, the ISL23418UFUZ-TK is a volatile DCP: its 8-bit Wiper Register (WR) resets to 64 (mid-scale) on every power-up. This behavior is guaranteed by internal power-on reset circuitry and ensures a known, safe default state - critical for systems where undefined analog outputs could cause malfunction.
Can the ISL23418UFUZ-TK operate with a 1.2V microcontroller SPI interface?
Yes - the ISL23418UFUZ-TK's dedicated VLOGIC pin accepts 1.2V to 5.5V, allowing direct connection to 1.2V, 1.8V, or 3.3V logic without external level shifters. Its input thresholds scale with VLOGIC (VIH = 0.7×VLOGIC), and SDO supports push-pull or open-drain output to match host requirements.
What happens to the wiper terminal (RW) during shutdown mode?
When the SHDN bit (ACR[6]) is cleared, the ISL23418UFUZ-TK forces RH–RL into open circuit and internally connects RW to RL via a ~2kΩ resistor. This provides a defined low-impedance path during sleep, preventing floating nodes that could induce noise or latch-up in sensitive analog circuits.
Is the ISL23418UFUZ-TK pin-compatible with other members of the ISL23418 family?
Yes - all ISL23418 variants (e.g., ISL23418TFUZ, ISL23418WFUZ) share identical 10-lead µTQFN pinouts and SPI command structure. Only the total resistance (10kΩ/50kΩ/100kΩ) and marking differ; firmware and PCB layout can be reused across variants with no hardware modification.
ISL23418UFUZ-TK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- XDCP™
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Taper:
- Linear
- Configuration:
- Potentiometer
- Number of Circuits:
- 1
- Number of Taps:
- 128
- Resistance (Ohms):
- 50k
- Interface:
- SPI
- Memory Type:
- Volatile
- Voltage - Supply:
- 1.2V ~ 5.5V, 1.7V ~ 5.5V
- Features:
- -
- Tolerance:
- ±20%
- Temperature Coefficient (Typ):
- 85ppm/°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 10-MSOP
- Operating Temperature:
- -40°C ~ 125°C
- Resistance - Wiper (Ohms) (Typ):
- 70
ISL23418UFUZ-TK FAQ
1.How can I place an order for ISL23418UFUZ-TK through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL23418UFUZ-TK 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 ISL23418UFUZ-TK reliable?
The price and inventory of ISL23418UFUZ-TK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL23418UFUZ-TK is usually 5 days.
3.What payment methods are accepted for ISL23418UFUZ-TK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL23418UFUZ-TK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL23418UFUZ-TK?
ISL23418UFUZ-TK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL23418UFUZ-TK 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 ISL23418UFUZ-TK?
For technical support, including ISL23418UFUZ-TK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL23418UFUZ-TK requirements.
6.How does Aetrix verify that ISL23418UFUZ-TK is sourced from the original manufacturer or authorized distributors?
All ISL23418UFUZ-TK 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 ISL23418UFUZ-TK meets industry standards.
7.What is the process for return or replacement of ISL23418UFUZ-TK?
All ISL23418UFUZ-TK units undergo pre-shipment inspection (PSI). If there is an issue with ISL23418UFUZ-TK, 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 ISL23418UFUZ-TK part is unused and in its original packaging.
Return procedure for ISL23418UFUZ-TK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISL23418UFUZ-TK Tags
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