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Renesas ISL23418UFUZ
- Part No.:
- ISL23418UFUZ
- Manufacturer:
- Renesas
- Category:
- Digital Potentiometers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ISL23418UFUZ.pdf
- Description:
- IC DGTL POT 50KOHM 128TAP 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
ISL23418UFUZ from Renesas (formerly Intersil) is a volatile, single-channel, 128-tap digitally controlled potentiometer (XDCP™) with SPI interface, 50kΩ total resistance, 10-lead MSOP package, and operation from 1.7V to 5.5V VCC and 1.2V to 5.5V VLOGIC. It delivers ±0.15 LSB INL in voltage divider mode and supports power supply margining in battery-powered instrumentation.
For engineers reviewing the ISL23418UFUZ datasheet, ISL23418UFUZ pinout, ISL23418UFUZ application, or ISL23418UFUZ equivalent, key selection criteria include wiper settling time (1.5 µs), shutdown current (<2.8 µA), ratiometric temperature coefficient (4 ppm/°C), and dual-supply independence for low-voltage logic interfacing without level shifters.
Technical Context
The ISL23418UFUZ implements a monolithic CMOS resistor ladder with CMOS wiper switches operating in "make-before-break" mode, controlled by an 8-bit volatile Wiper Register (WR) accessible via SPI Mode 0. Its architecture separates analog (VCC/GND/RH/RL/RW) and digital (VLOGIC/SCK/SDI/SDO/CS) domains to enable independent supply scaling.
It features dedicated shutdown functionality (ACR[6]) that forces RH–RL open-circuit while shorting RW to RL through ~2 kΩ, preserving WR contents across shutdown cycles. Power-on defaults WR to 40h (64 decimal), placing the wiper at mid-scale - a deterministic startup behavior critical for bias-critical applications like RF amplifier compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Total Resistance | 50 kΩ - defines full-scale adjustment range in gain/bias circuits; matched tolerance (±2%) ensures predictable scaling |
| Wiper Resistance | 70 Ω typical @ 3.3V - minimizes insertion error in precision voltage divider configurations |
| INL (Voltage Divider) | ±0.15 LSB - guarantees monotonicity and <0.04% full-scale linearity error for calibration-sensitive instruments |
| VLOGIC Range | 1.2 V to 5.5 V - enables direct connection to 1.2V/1.8V/3.3V/5V logic without external level shifters |
| Shutdown Current | <2.8 µA max - supports ultra-low-power sleep modes in portable medical and handheld equipment |
| Temp Range | −40°C to +125°C - qualified for under-hood automotive, industrial control, and high-reliability embedded systems |
| Ratiometric TC | 4 ppm/°C - ensures stable tap-to-tap ratio over temperature, critical for reference voltage trimming |
Pinout & Package
ISL23418UFUZ is housed in a RoHS-compliant 10-lead MSOP package (M10.118), 3.0 mm × 3.0 mm × 1.0 mm, with exposed pad for thermal enhancement. Pin numbering follows standard top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VLOGIC (Pin 1) | Digital supply input | Provides independent logic-level reference (1.2–5.5 V); decouples SPI signaling from analog VCC rail |
| SCK (Pin 2) | SPI clock input | Edge-triggered serial clock (up to 5 MHz); rising edge clocks SDI data, falling edge clocks SDO output |
| SDO (Pin 3) | SPI data output | Configurable push-pull or open-drain; tri-stated when CS is high to support daisy-chaining |
| SDI (Pin 4) | SPI data input | Accepts instruction + data bytes (MSB-first); requires setup/hold timing compliance per SPI Mode 0 |
| CS (Pin 5) | Chip select input | Active-low enable; rising edge latches write operations and triggers wiper update after settling |
| RL (Pin 6) | DCP low terminal | Analog ground reference point in voltage divider; connected internally to RW during shutdown |
| RW (Pin 7) | Wiper terminal | Adjustable output node; settles to new tap position within 1.5 µs after CS rising edge |
| RH (Pin 8) | DCP high terminal | Analog VCC reference in voltage divider; open-circuited during shutdown mode |
| VCC (Pin 9) | Analog supply | Powers resistor ladder and analog circuitry (1.7–5.5 V); sets DCP terminal voltage range (0–VCC) |
| GND (Pin 10) | Analog ground | Common return for RH/RL/RW; separate from digital ground to minimize noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| 128-tap resolution | Enables fine-grained analog tuning (e.g., 0.78% step size in 50kΩ divider) for high-accuracy calibration loops |
| Volatile Wiper Register | Allows dynamic real-time wiper updates via SPI without nonvolatile memory wear-out or write latency |
| Independent VLOGIC/VCC rails | Eliminates need for external level translators when interfacing with sub-1.8V microcontrollers or FPGAs |
| Mid-scale power-on default | Guarantees known, safe startup state (RW = 25 kΩ) - avoids undefined bias conditions in amplifiers or references |
| Daisy-chain SPI capability | Supports multi-potentiometer synchronization using single CS/SCK lines - reduces GPIO count in dense BOMs |
Applications
| Power Supply Margining | RF Power Amplifier Bias Compensation |
|---|---|
Use Scenario: Adjusting DC bias points of voltage regulators or LDOs during production test to validate stability margins across process/voltage/temperature corners. IC Role / Device Role / Timing Role: Digitally programmable resistance element in feedback network of adjustable regulator ICs. Use Value: Enables automated, repeatable margin testing without manual trimmer replacement; 50kΩ value matches typical feedback divider impedance. | Use Scenario: Compensating for temperature-induced drift in GaAs or LDMOS PA bias networks to maintain constant output power and efficiency. IC Role / Device Role / Timing Role: Precision ratiometric resistor in bias voltage divider feeding gate/base of RF transistor. Use Value: 4 ppm/°C ratiometric TC ensures stable bias point over −40°C to +125°C; low noise (49 nV/√Hz) prevents signal degradation. |
| LCD Bias Compensation | Portable Medical Equipment Calibration |
Use Scenario: Fine-tuning VCOM or gamma reference voltages in TFT-LCD panels to correct grayscale inversion and color shift across viewing angles and temperature. IC Role / Device Role / Timing Role: Adjustable voltage divider setting reference potential for LCD source driver ICs. Use Value: 128-tap resolution provides sufficient granularity for gamma curve shaping; 1.2V VLOGIC compatibility enables integration with low-power display controllers. | Use Scenario: Calibrating sensor front-end gain/offset in handheld ECG or pulse oximeter modules during final test and field recalibration. IC Role / Device Role / Timing Role: Programmable gain-setting resistor in instrumentation amplifier feedback path. Use Value: ±0.15 LSB INL ensures traceable calibration accuracy; shutdown mode (<2.8 µA) extends battery life between calibration cycles. |
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 | Nonvolatile EEPROM storage; 256-tap resolution; 10-lead MSOP; 50kΩ; I²C interface only | Requires no host initialization at power-up; unsuitable for high-write-cycle dynamic tuning | Select for systems needing persistent wiper settings across power cycles; avoid where frequent SPI writes are required |
| MCP45HV51-503 | Volatile; 256-tap; 10-lead MSOP; 50kΩ; SPI interface; 12V tolerant RH/RL/RW pins | Supports higher analog voltage rails (up to 12V); larger wiper resistance (120 Ω typ) | Select for 5–12V analog systems; avoid in low-noise, low-insertion-error designs where 70 Ω wiper resistance is critical |
Compared with AD5175BRMZ-50 and MCP45HV51-503, the ISL23418UFUZ offers superior low-voltage logic compatibility (1.2V VLOGIC), lower wiper resistance (70 Ω), and faster wiper settling (1.5 µs), making it optimal for battery-powered, high-precision, dynamically tuned analog circuits.
Availability
ISL23418UFUZ is available at Aetrix Electronics and suitable for power supply margining, RF amplifier bias compensation, and portable medical equipment calibration requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ISL23418UFUZ 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, including digitally controlled potentiometers optimized for industrial, automotive, and medical applications.
The ISL23418UFUZ belongs to Renesas' XDCP™ (eXternally Digitally Controlled Potentiometer) family, designed specifically for replacing mechanical trimmers in high-reliability, low-power, and thermally demanding analog signal conditioning and bias control systems.
FAQ
What is the total resistance value of the ISL23418UFUZ?
The ISL23418UFUZ has a nominal total resistance (RH to RL) of 50 kΩ, with a guaranteed tolerance of ±2% across the full operating temperature range (−40°C to +125°C). This value is fixed per the ordering code 'U' in ISL23418UFUZ and is confirmed in the datasheet's Analog Specifications table on page 4.
Does the ISL23418UFUZ retain wiper position after power cycling?
No, the ISL23418UFUZ uses a volatile Wiper Register (WR) and resets to mid-scale (64-tap position, WR = 40h) on every power-up. It does not include nonvolatile memory. To restore a prior setting, the host MCU must reprogram the WR register via SPI after power-on - a behavior explicitly defined in the "Principles of Operation" section (page 13) of the FN7901 datasheet.
Can the ISL23418UFUZ operate with different VCC and VLOGIC supply voltages?
Yes, the ISL23418UFUZ supports independent supplies: VCC (1.7–5.5 V) powers the analog resistor ladder and wiper circuitry, while VLOGIC (1.2–5.5 V) powers the SPI interface logic. This allows direct connection to 1.2V or 1.8V microcontrollers without level shifters - a key feature highlighted in the datasheet's first paragraph and "Features" list (page 1).
What is the maximum SPI clock frequency supported by the ISL23418UFUZ?
The ISL23418UFUZ supports up to 5 MHz SCK frequency when VLOGIC ≥ 1.7 V, and up to 1 MHz when VLOGIC is 1.2–1.6 V. These limits are specified in the "Serial Interface Specification" table (page 7) and ensure reliable setup/hold timing for SDI/SDO transitions across voltage and temperature conditions.
How does the shutdown mode function in the ISL23418UFUZ?
In shutdown mode (enabled via ACR[6]), the ISL23418UFUZ opens the RH–RL path and internally connects RW to RL through a ~2 kΩ resistor. All WR register contents are preserved. Upon exit, the wiper returns to its pre-shutdown position after ≤1.5 µs settling time. This behavior is documented in Figures 25–26 and the "Shutdown Function" section (page 13) of FN7901.
ISL23418UFUZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- XDCP™
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for ISL23418UFUZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL23418UFUZ 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 reliable?
The price and inventory of ISL23418UFUZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL23418UFUZ is usually 5 days.
3.What payment methods are accepted for ISL23418UFUZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL23418UFUZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL23418UFUZ?
ISL23418UFUZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL23418UFUZ 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?
For technical support, including ISL23418UFUZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL23418UFUZ requirements.
6.How does Aetrix verify that ISL23418UFUZ is sourced from the original manufacturer or authorized distributors?
All ISL23418UFUZ 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 meets industry standards.
7.What is the process for return or replacement of ISL23418UFUZ?
All ISL23418UFUZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL23418UFUZ, 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 part is unused and in its original packaging.
Return procedure for ISL23418UFUZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISL23418UFUZ Tags
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MCP4018T-103E/LT
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MCP4018T-503E/LT
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MCP4011T-103E/SN
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MCP4021T-202E/SN
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