Renesas ISL21009DFB825Z-TK

Overview

ISL21009DFB825Z-TK from Intersil is a high-voltage-input, precision, low-noise voltage reference IC delivering 2.500V output with ±2.0mV initial accuracy, 10ppm/°C temperature coefficient, 4.5µV_P-P (0.1Hz–10Hz) output noise, and 180µA maximum supply current. It operates from 3.5V to 16.5V input and supports ±7.0mA output current, enabling use in high-resolution data converters and battery-powered instrumentation.

For engineers reviewing the ISL21009DFB825Z-TK datasheet, ISL21009DFB825Z-TK pinout, ISL21009DFB825Z-TK application, or ISL21009DFB825Z-TK equivalent, key selection criteria include its FGA™ floating-gate analog technology, guaranteed thermal hysteresis ≤50ppm, long-term stability of 50ppm, and SOIC-8 package compatibility with industrial (-40°C to +125°C) operation.

Technical Context

The ISL21009DFB825Z-TK uses Intersil's proprietary Floating Gate Analog (FGA™) technology to achieve ultra-low drift and micropower operation without bandgap or zener-based architectures. Its buffered output stage delivers stable 2.500V reference voltage while maintaining 4.5µV_P-P low-frequency noise and 2.2µV_RMS broadband noise (10Hz–1kHz).

It features a high-impedance TRIM pin enabling ±2.5% output adjustment via external potentiometer, and supports load regulation of 10–50µV/mA (sourcing) and 20–100µV/mA (sinking). Line regulation is specified at 10–50µV/V across 5.5V–16.5V input range, with PSRR ≥60dB at 10kHz.

Key Specifications

Pinout & Package

ISL21009DFB825Z-TK is housed in an 8-lead Pb-free SOIC package (JEDEC MS-012-AA, M8.15 drawing), with 1.27mm pitch, 4.80–5.00mm body width, and 3.80–4.00mm body length. Thermal resistance θ_JA = 115°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage reference applications.

Compared with ADR4525BRZ-R7 and REF5025AIDR, the ISL21009DFB825Z-TK trades 0.8–1.75mV initial accuracy and ~1–1.5ppm/°C tempco for >5× lower supply current, enabling true micropower designs without sacrificing industrial temperature range or SOIC-8 compatibility.

Availability

ISL21009DFB825Z-TK is available at Aetrix Electronics and suitable for high-resolution data acquisition, portable instrumentation, industrial sensor transmitters, and battery management systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ISL21009DFB825Z-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

Intersil Corporation, now part of Renesas Electronics, designs high-performance analog and mixed-signal ICs for precision, power management, and interface applications.

The ISL21009DFB825Z-TK belongs to Intersil's FGA™ voltage reference product line, engineered specifically for micropower, low-noise, high-accuracy applications in portable test equipment, industrial sensors, and energy-constrained embedded systems.

FAQ

What is the guaranteed initial accuracy of ISL21009DFB825Z-TK over temperature?

The ISL21009DFB825Z-TK guarantees ±2.0mV initial accuracy at +25°C. Over the full -40°C to +125°C operating range, total error includes tempco (10ppm/°C), thermal hysteresis (≤50ppm), and long-term stability (50ppm), resulting in worst-case deviation of approximately ±3.3mV from nominal 2.500V output.

Can ISL21009DFB825Z-TK drive a 10µF output capacitor directly?

No - ISL21009DFB825Z-TK is not optimized for heavy capacitive loads. Driving >1.0µF directly risks instability and excessive overshoot. For 10µF requirements, use the RC noise-reduction network shown in Figure 58: 2kΩ resistor in series with 0.01µF, then parallel 10µF, which maintains stability while reducing broadband noise.

Does ISL21009DFB825Z-TK require external trimming to achieve its specified accuracy?

No - ISL21009DFB825Z-TK achieves ±2.0mV initial accuracy at +25°C without external trimming. The TRIM pin is optional and provided for system-level calibration; leaving it unconnected maintains factory-trimmed performance. Trimming adds ±2.5% adjustability but introduces additional tempco uncertainty.

How does the FGA™ technology in ISL21009DFB825Z-TK differ from conventional bandgap references?

FGA™ uses charge stored on a floating gate to define reference voltage, eliminating reliance on silicon bandgap voltage or zener breakdown. This yields superior initial accuracy, lower tempco, and near-zero supply current drift - unlike bandgap references that require bias current scaling and suffer from curvature correction limitations.

What is the maximum continuous output current capability of ISL21009DFB825Z-TK?

The ISL21009DFB825Z-TK supports up to ±7.0mA output current - both sourcing and sinking - while maintaining specified load regulation (10–50µV/mA sourcing, 20–100µV/mA sinking) and output voltage accuracy within ±2.0mV at +25°C. Exceeding ±7mA may cause dropout or increased noise.