Texas Instruments REF5025SKGD1

Overview

REF5025SKGD1 from Texas Instruments is a high-precision, low-noise, very-low-drift voltage reference in Known-Good-Die (KGD) form, designed for sourcing and sinking ±7 mA with 2.5 V nominal output, 40 ppm/°C max drift over –55°C to +210°C, and 7.5 μV_PP (0.1–10 Hz) noise - deployed in aerospace-grade data acquisition systems requiring extended temperature operation.

For engineers reviewing the REF5025SKGD1 datasheet, REF5025SKGD1 pinout, REF5025SKGD1 application, or REF5025SKGD1 equivalent, this page delivers verified package mapping (XCEPT KGD), validated terminal functions (VOUT, VIN, GND, TEMP, TRIM/NR), confirmed military-temperature electrical specs, and real-world design constraints including ESR-sensitive load capacitance (1–50 μF) and bandgap noise filtering via TRIM/NR.

Technical Context

The REF5025SKGD1 implements a proprietary bandgap core with buffered output amplifier enabling bidirectional current delivery (±7 mA), while its TRIM/NR pin provides direct access to the internal bandgap node for external RC filtering - a 1 μF capacitor here reduces broadband noise by −21 dB and cuts 0.1–10 Hz output noise nearly in half. Its TEMP pin delivers a calibrated 2.64 mV/°C analog temperature signal referenced to GND with ~60 kΩ source impedance.

Designed for extreme environments, the device operates across –55°C to +210°C with guaranteed 40 ppm/°C max drift (box method), 0.9% initial accuracy at 25°C, and 1.2 mA typical quiescent current. It requires input bypassing (1–10 μF) and stable output loading (1–50 μF, ESR 1–1.5 Ω) to avoid gain peaking and maintain <38.5 μV_RMS noise performance in 80 kHz bandwidths.

Key Specifications

Pinout & Package

REF5025SKGD1 is supplied as Known-Good-Die (KGD) in XCEPT format, with die dimensions 2.04 mm × 1.676 mm and 12 bond pads. The functional terminals are mapped per TI SBOS502F: VOUT (pads 10 & 11), VIN (pad 3), GND (pads 6 & 7), TEMP (pad 5), TRIM/NR (pad 8), and NC/DNC (pads 1, 2, 4, 9, 12).

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF5025-HT, REF5025SKGD1 offers identical precision but enables custom hybrid packaging and tighter thermal management; compared with ADR4525B, it trades some drift/noise performance for extreme-temperature operation, integrated TEMP sensing, and bandgap noise filtering - making it irreplaceable in aerospace and energy exploration.

Availability

REF5025SKGD1 is available at Aetrix Electronics and suitable for high-reliability applications in aerospace instrumentation, downhole oilfield tools, and military power monitoring systems requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for REF5025SKGD1 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

Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in precision analog, high-reliability ICs, and space-qualified components.

The REF5025 family was engineered specifically for high-accuracy, low-drift voltage referencing in mission-critical systems operating beyond commercial temperature limits - targeting avionics, oilfield, and defense electronics where failure is not an option.

FAQ

What is the maximum operating temperature of the REF5025SKGD1?

The REF5025SKGD1 is fully specified and qualified for continuous operation from –55°C to +210°C junction temperature. This rating is validated per TI's military-temperature qualification process and supported by life-derating data in Figure 1 of SBOS502F. Operation above +210°C is not guaranteed and may impact long-term reliability. REF5025SKGD1 must be mounted with appropriate thermal interface to sustain this range in actual systems.

Does REF5025SKGD1 require an external capacitor on the TRIM/NR pin?

No, the TRIM/NR pin is optional: it can be left open for fixed 2.5 V output, or used for ±15 mV adjustment or noise reduction. When used for noise filtering, a 1 μF capacitor to GND creates a ~14.5 Hz low-pass filter that cuts 0.1–10 Hz output noise by >50%. REF5025SKGD1 remains fully functional without it, but achieves lowest noise only with this external component.

Can REF5025SKGD1 drive a 10 μF ceramic capacitor directly?

Yes, but only if its ESR falls within 1–1.5 Ω. Low-ESR ceramic capacitors (<100 mΩ) cause gain peaking near 9 kHz and increase measured noise (e.g., 37.1 μV_RMS vs 23.2 μV_RMS with 47 μF tantalum). REF5025SKGD1's stability depends on combined ESR and CL; TI recommends verifying noise and transient response with actual capacitor type and layout before final design sign-off.

What is the function of the TEMP pin on REF5025SKGD1?

The TEMP pin outputs a linear analog voltage (575 mV at 25°C + 2.64 mV/°C) proportional to die temperature, with ~60 kΩ source impedance. It is intended for thermal compensation or overtemperature warning - not precision measurement. REF5025SKGD1's TEMP pin must be buffered with a low-drift op-amp (e.g., OPA333) before connection to an ADC; direct loading degrades accuracy but does not affect VOUT stability.

Is REF5025SKGD1 pin-compatible with other REF50xx variants?

No - REF5025SKGD1 is a bare die (XCEPT KGD) with 12 bond pads and no standardized pinout like packaged versions. It shares functional terminals (VOUT, VIN, GND, etc.) with REF5025-HT, but physical mapping differs entirely. REF5025SKGD1 requires custom die attach and wire bonding; it is not a drop-in replacement for HKJ/HKQ packages. System integration must follow TI's KGD handling and mounting guidelines.