Renesas ISL22512WFB8Z-TK

Overview

ISL22512WFB8Z-TK from Renesas Electronics (formerly Intersil) is a solid-state, non-volatile, push-button controlled digital potentiometer with 16 wiper tap points, 10kΩ end-to-end resistance, and low-power CMOS operation across 2.7V–5.5V supply. It features auto-increment/decrement timing modes, AUTOSTORE capability, and shutdown mode for power-sensitive volume or brightness control circuits.

For engineers reviewing the ISL22512WFB8Z-TK datasheet, ISL22512WFB8Z-TK pinout, ISL22512WFB8Z-TK application, or ISL22512WFB8Z-TK equivalent, this device serves as a drop-in replacement for mechanical potentiometers in analog biasing, LED dimming, and contrast adjustment where EEPROM retention, push-button simplicity, and extended industrial temperature range (-40°C to +125°C) are required.

Technical Context

The ISL22512WFB8Z-TK implements a 15-element resistor ladder with a digitally switched wiper driven by a 4-bit up/down counter and decoded via transfer gates. Its control logic includes hardware debounce (15–28ms), dual timing modes (slow/fast scan), and autonomous shutdown activation upon simultaneous PU/PD low assertion for ≥2s.

Non-volatile storage uses on-chip EEPROM with 1M-cycle endurance and 50-year data retention at ≤+55°C. The device operates in voltage divider or rheostat configurations, supports terminal voltages from 0 to VCC, and maintains ratiometric temperature coefficient of ±25ppm/°C in voltage divider mode.

Key Specifications

Pinout & Package

ISL22512WFB8Z-TK is housed in an 8-lead narrow-body SOIC package (M8.15 outline), RoHS-compliant, with 1.27mm lead pitch and 5.80mm × 4.00mm body dimensions.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digitally controlled potentiometer applications.

Compared with AD5170BRMZ-10 and MCP4017T-103I/OT, the ISL22512WFB8Z-TK uniquely combines push-button simplicity, AUTOSTORE persistence, and shutdown power gating - making it optimal for human-accessible analog controls where firmware dependency and continuous power draw must be minimized.

Availability

ISL22512WFB8Z-TK is available at Aetrix Electronics and suitable for volume control, LED brightness control, and contrast adjustment requiring stable component supply across automotive, industrial, and medical product lifecycles.

Supply support for ISL22512WFB8Z-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 Corporation is a global semiconductor leader delivering high-performance analog, power management, and embedded processing solutions for industrial, automotive, and infrastructure markets.

The ISL22512WFB8Z-TK belongs to Renesas' XDCP™ (eXternally Controlled Digital Potentiometer) family, designed specifically for replacing mechanical potentiometers in harsh-environment analog control applications where reliability, non-volatility, and tactile user interface are essential.

FAQ

What is the operating voltage range for the ISL22512WFB8Z-TK?

The ISL22512WFB8Z-TK operates from 2.7V to 5.5V on VCC. Terminal voltages (RH, RL, RW) must remain within 0V to VCC relative to VSS. This range supports both 3.3V and 5V systems without level-shifting, and the device maintains specified performance-including wiper resistance and INL-across the full supply range as verified in the datasheet's DC Electrical Specifications table.

Does the ISL22512WFB8Z-TK retain its wiper position after power loss?

Yes, the ISL22512WFB8Z-TK retains its last wiper position using on-chip EEPROM. When AUTOSTORE is enabled (ASE held LOW at power-up), the device automatically saves the wiper value after 2 seconds of inactivity on PU/PD. Manual store is also possible by pulsing ASE LOW. EEPROM endurance is rated at 1,000,000 cycles with 50-year data retention at ≤+55°C, ensuring long-term reliability in the ISL22512WFB8Z-TK.

How does the push-button timing work on the ISL22512WFB8Z-TK?

The ISL22512WFB8Z-TK implements dual-speed timing: a slow mode (100–390ms per step) for fine adjustment during brief button presses, and a fast mode (25–78ms per step) activated when PU or PD is held >1 second. Internal debounce (15–28ms) prevents false triggers from switch bounce. Both modes are fully hardware-based-no firmware or external timing components are needed for the ISL22512WFB8Z-TK to deliver responsive, reliable manual control.

Can the ISL22512WFB8Z-TK be used in rheostat mode?

Yes, the ISL22512WFB8Z-TK supports rheostat configuration by floating RH or connecting it to RW. In this mode, resistance is measured between RW and RL (or RW and RH), with RINL ≤±1.5 LSB and RDNL ≤±0.5 LSB over the full tap range. Wiper resistance remains 130–400Ω, and the device maintains monotonicity-making the ISL22512WFB8Z-TK suitable for current-setting applications like LED biasing or op-amp gain control.

What happens when both PU and PD are pressed simultaneously on the ISL22512WFB8Z-TK?

Holding both PU and PD LOW for ≥2 seconds activates Shutdown Mode: the RH terminal is disconnected from the resistor array, and the wiper is forced to the RL position to minimize power consumption. If PU and PD are pressed simultaneously but released before 2 seconds, all commands are ignored. To exit shutdown, hold any of PU, PD, or ASE LOW for >15ms-the ISL22512WFB8Z-TK then restores the pre-shutdown wiper position and resumes normal operation.