Texas Instruments REF5020MDREP

Overview

REF5020MDREP from Texas Instruments is a radiation-hardened, extended-temperature precision voltage reference delivering 2.048 V output with ±0.08% initial accuracy, 3 ppm/°C max temperature drift, 6 µV_PP (0.1–10 Hz) low-frequency noise, and ±10 mA sourcing/sinking capability in an SOIC-8 package. It serves as the stable reference for high-resolution ADCs in space-grade data acquisition systems requiring long-term stability under thermal cycling and ionizing radiation.

For engineers reviewing the REF5020MDREP datasheet, REF5020MDREP pinout, REF5020MDREP application, or REF5020MDREP equivalent, this page delivers verified specifications, military-grade thermal and noise performance data, TRIM/NR pin noise-reduction implementation guidance, TEMP pin temperature monitoring behavior, and validated alternatives for radiation-tolerant analog signal chains.

Technical Context

The REF5020MDREP implements a proprietary bandgap core with buffered output amplifier, enabling bidirectional current flow (±10 mA) while maintaining sub-10 µV_PP noise and <5 ppm/°C drift over –55°C to +125°C. Its TRIM/NR pin provides direct access to the bandgap node for external capacitor-based low-pass filtering-1 µF reduces broadband noise by 6 dB-and enables ±15 mV output adjustment via resistor divider.

Temperature monitoring is implemented via the TEMP pin (pin 3), delivering 575 mV at 25°C with 2.64 mV/°C slope and ~60 kΩ source impedance; buffering with a low-drift op amp (e.g., OPA335) is required for accurate readout. Input regulation requires VIN ≥ VOUT + 0.2 V (min 2.7 V for REF5020), with PSRR >80 dB up to 1 kHz and dropout voltage <0.2 V at full load.

Key Specifications

Pinout & Package

REF5020MDREP is housed in an 8-pin SOIC package (4.90 mm × 3.91 mm body size) with exposed pad for thermal enhancement. Pin 1 and Pin 8 are DNC (do not connect); Pin 7 is NC (no internal connection).

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF5020MDREP, REF5025MDREP offers higher nominal voltage and tighter initial accuracy but same thermal/noise behavior, while ADR4520B delivers superior noise performance in non-radiation environments but lacks TEMP monitoring and extended-lifecycle support.

Availability

REF5020MDREP is available at Aetrix Electronics and suitable for spaceborne data acquisition, high-accuracy automated test equipment, and industrial process control systems requiring stable component supply across extended temperature and radiation-exposed environments.

Supply support for REF5020MDREP 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 leader specializing in analog and embedded processing technologies, with decades of heritage in precision analog IC design and space-grade component qualification.

The REF50xx family-including REF5020MDREP-is engineered for high-precision data acquisition systems demanding ultra-low drift, low noise, and robustness across extreme environmental conditions including radiation, thermal cycling, and long-duration operation.

FAQ

What is the minimum input voltage required for stable operation of the REF5020MDREP?

The REF5020MDREP requires VIN ≥ 2.7 V for stable regulation, which is higher than the generic VOUT + 0.2 V rule due to its 2.048 V output. Below 2.7 V, output accuracy degrades and regulation may fail. This specification is confirmed in Section 6.3 (Recommended Operating Conditions) of the SBOS471B datasheet for REF5020MDREP.

Can the REF5020MDREP drive a 10 µF capacitive load directly at its VOUT pin?

Yes-the REF5020MDREP is specified for stable operation with 1–50 µF output capacitance, provided the capacitor's ESR is between 1 Ω and 1.5 Ω. Ceramic capacitors with low ESR (<100 mΩ) may cause gain peaking and increased noise; tantalum or polymer types meeting the ESR spec are preferred for optimal stability and noise performance in REF5020MDREP designs.

How does the TRIM/NR pin function in the REF5020MDREP, and what is its practical impact?

The TRIM/NR pin (Pin 5) of the REF5020MDREP provides access to the internal bandgap node. Connecting a 1 µF capacitor here creates a low-pass filter that reduces 0.1–10 Hz output noise by 50% (from 6 µV_PP to ~3 µV_PP). It also allows ±15 mV output adjustment using an external resistor divider-enabling fine-tuning for system-level calibration without trimming the reference itself.

Is the TEMP pin on the REF5020MDREP suitable for accurate temperature measurement?

No-the TEMP pin on the REF5020MDREP provides only relative temperature indication (575 mV @ 25°C, 2.64 mV/°C) with ±15°C accuracy and ~60 kΩ output impedance. It is intended for thermal trend monitoring or coarse compensation-not precision thermometry. Accurate reading requires buffering with a low-drift op amp (e.g., OPA335) to prevent loading errors, and calibration against a known reference is necessary for quantitative use.

What is the short-circuit current limit of the REF5020MDREP, and how does it behave during overload?

The REF5020MDREP limits short-circuit current to 25 mA (typical) when VOUT is forced to 0 V. During sustained overload, the device maintains thermal protection via internal junction temperature sensing and reduces output current to prevent damage. This behavior is documented in Section 6.6 (Electrical Characteristics: All Devices) of the REF5020MDREP datasheet and supports robust operation in fault-prone industrial interfaces.