REF5025AIDG4 Equivalent & Substitute Parts

Part Overview

The REF5025AIDG4 is a Series Voltage Reference IC manufactured by Texas Instruments, delivering a fixed 2.5V output with ±0.1% tolerance and 10 mA output current in an 8-SOIC surface mount package. This part is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements. The REF5025AIDG4 operates across an input voltage range of 2.7V to 18V with a supply current of 1.2 mA and temperature coefficient of 8 ppm/°C, suitable for precision analog applications requiring stable voltage references.

Key Parameters

Parameter	Value	Unit
Output Voltage (Fixed)	2.5	V
Output Current	10	mA
Tolerance	±0.1	%
Temperature Coefficient	8	ppm/°C
Input Voltage Range	2.7 to 18	V
Supply Current	1.2	mA
Noise (0.1Hz to 10Hz)	7.5	µVpp/V
Operating Temperature Range	-40 to 125	°C
Package Type	8-SOIC	0.154" / 3.90mm Width
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	2 (1 Year)

Substitute Part Grouping Explanation

Substitution of the REF5025AIDG4 is determined by strict alignment of the following critical parameters:

Primary Substitution Criteria:

Fixed output voltage of 2.5V
Output current capability of 10 mA minimum
8-SOIC surface mount package (0.154" / 3.90mm width)
Operating temperature range of -40°C to 125°C
RoHS3 compliance and REACH unaffected status

Secondary Compatibility Parameters:

Tolerance specification (±0.1% preferred; ±0.2% acceptable with design verification)
Input voltage range compatibility (minimum 2.7V to 18V overlap required)
Temperature coefficient performance
Noise characteristics (0.1Hz to 10Hz)

Substitute parts are grouped into two categories based on tolerance matching:

Category A - Direct Tolerance Match (±0.1%): REF5025AID, ADR03BRZ, ADR03BRZ-REEL7, MAX873AESA+, MAX873AESA+T, MAX873BESA+, MAX873BESA+T

Category B - Relaxed Tolerance (±0.2%): ADR03ARZ, ADR03ARZ-REEL7, ADR03WARZ-RL

All substitute parts maintain the 2.5V fixed output, 10 mA output current, 8-SOIC package, and -40°C to 125°C operating temperature range. Packaging variants (Tube, Cut Tape & Digi-Reel, Tape & Reel) are interchangeable for component functionality but differ in supply format.

Parameter Comparison

Part Number	Manufacturer	Status	Output Voltage	Tolerance	Temp Coeff	Input Range	Supply Current	Noise (0.1-10Hz)	Temp Range	Package
REF5025AIDG4	Texas Instruments	Obsolete	2.5V	±0.1%	8 ppm/°C	2.7-18V	1.2 mA	7.5 µVpp/V	-40 to 125°C	8-SOIC
REF5025AID	Texas Instruments	Active	2.5V	±0.1%	8 ppm/°C	2.7-18V	1.2 mA	7.5 µVpp/V	-40 to 125°C	8-SOIC
ADR03ARZ	Analog Devices Inc.	Active	2.5V	±0.2%	10 ppm/°C	4.5-36V	1 mA	6 µVp-p	-40 to 125°C	8-SOIC
ADR03ARZ-REEL7	Analog Devices Inc.	Active	2.5V	±0.2%	10 ppm/°C	4.5-36V	1 mA	6 µVp-p	-40 to 125°C	8-SOIC
ADR03BRZ	Analog Devices Inc.	Active	2.5V	±0.1%	3 ppm/°C	4.5-36V	1 mA	6 µVp-p	-40 to 125°C	8-SOIC
ADR03BRZ-REEL7	Analog Devices Inc.	Active	2.5V	±0.1%	3 ppm/°C	4.5-36V	1 mA	6 µVp-p	-40 to 125°C	8-SOIC
ADR03WARZ-RL	Analog Devices Inc.	Active	2.5V	±0.2%	10 ppm/°C	4.5-26V	1 mA	6 µVp-p	-40 to 125°C	8-SOIC
MAX873AESA+	Analog Devices Inc./Maxim Integrated	Active	2.5V	±0.06%	7 ppm/°C	4.5-18V	600 µA	3.8 µVp-p	-40 to 85°C	8-SOIC
MAX873AESA+T	Analog Devices Inc./Maxim Integrated	Active	2.5V	±0.06%	7 ppm/°C	4.5-18V	600 µA	3.8 µVp-p	-40 to 85°C	8-SOIC
MAX873BESA+	Analog Devices Inc./Maxim Integrated	Active	2.5V	±0.1%	20 ppm/°C	4.5-18V	600 µA	3.8 µVp-p	-40 to 85°C	8-SOIC
MAX873BESA+T	Analog Devices Inc./Maxim Integrated	Active	2.5V	±0.1%	20 ppm/°C	4.5-18V	600 µA	3.8 µVp-p	-40 to 85°C	8-SOIC

Engineering Selection Recommendations

Primary Recommendation: REF5025AID

The REF5025AID is the direct active equivalent to the obsolete REF5025AIDG4. Both parts are manufactured by Texas Instruments and share identical electrical specifications: 2.5V fixed output, ±0.1% tolerance, 8 ppm/°C temperature coefficient, 2.7V to 18V input range, and 1.2 mA supply current. The REF5025AID maintains active product status with 6950 pieces in stock, ensuring supply continuity. This part is RoHS3 compliant and REACH unaffected, matching the compliance profile of the original component. Packaging is available in Tube format. Selection of REF5025AID eliminates design modification requirements and provides the highest compatibility assurance.

Secondary Recommendation: ADR03BRZ / ADR03BRZ-REEL7

The ADR03BRZ series from Analog Devices Inc. provides ±0.1% tolerance matching the REF5025AIDG4 specification. The ADR03BRZ demonstrates superior temperature coefficient performance at 3 ppm/°C compared to the original 8 ppm/°C, resulting in improved long-term stability. Input voltage range extends to 4.5V to 36V, providing broader supply compatibility. Supply current is reduced to 1 mA, offering lower power consumption. Both tube (ADR03BRZ) and reel (ADR03BRZ-REEL7) packaging options are available with 6134 and 6732 pieces in stock respectively. This part is RoHS3 compliant with MSL rating of 1 (Unlimited), indicating superior moisture resistance. The ADR03BRZ is suitable for applications where enhanced temperature stability and extended input voltage range provide design advantages.

Alternative Recommendation: MAX873BESA+ / MAX873BESA+T

The MAX873BESA+ series from Analog Devices Inc./Maxim Integrated offers ±0.1% tolerance with enhanced noise performance (3.8 µVp-p versus 7.5 µVpp/V). Supply current is reduced to 600 µA, providing significant power savings in battery-powered applications. However, the operating temperature range is limited to -40°C to 85°C, which is narrower than the REF5025AIDG4 specification of -40°C to 125°C. This limitation restricts use in high-temperature environments. The MAX873BESA+ is suitable only for applications operating within the -40°C to 85°C range where lower noise and reduced power consumption are prioritized. Tube (MAX873BESA+) and reel (MAX873BESA+T) packaging options are available with 2429 and 4440 pieces in stock respectively.

Relaxed Tolerance Alternative: ADR03ARZ / ADR03ARZ-REEL7

The ADR03ARZ series provides ±0.2% tolerance, representing a relaxation from the original ±0.1% specification. This part is suitable only for applications where ±0.2% tolerance is acceptable within the system design margin. The ADR03ARZ offers extended input voltage range (4.5V to 36V) and reduced supply current (1 mA). Both tube (ADR03ARZ) and reel (ADR03ARZ-REEL7) packaging options are available with 1433 and 16200 pieces in stock respectively. Selection of this part requires design verification to confirm tolerance compatibility.

Automotive Grade Option: ADR03WARZ-RL

The ADR03WARZ-RL is designated for automotive applications with ±0.2% tolerance and Tape & Reel packaging. Input voltage range is 4.5V to 26V. This part is suitable only for automotive designs where the relaxed tolerance specification is acceptable. Limited inventory of 762 pieces is available.

Frequently Asked Questions (FAQ)

Q1: Can REF5025AID directly replace REF5025AIDG4 without circuit modification?

Yes. The REF5025AID is the active equivalent manufactured by Texas Instruments with identical electrical specifications, package type (8-SOIC), and operating parameters. No circuit modification is required. The part is pin-compatible and functionally equivalent.

Q2: What is the key difference between Category A (±0.1% tolerance) and Category B (±0.2% tolerance) substitutes?

Category A substitutes (REF5025AID, ADR03BRZ, MAX873BESA+) maintain the original ±0.1% tolerance specification, ensuring equivalent accuracy performance. Category B substitutes (ADR03ARZ, ADR03WARZ-RL) have relaxed ±0.2% tolerance, which may impact system accuracy depending on application requirements. Category B parts require design verification to confirm tolerance compatibility before implementation.

Q3: Why do some substitutes have different input voltage ranges?

Input voltage range differences reflect manufacturer design choices. The original REF5025AIDG4 operates from 2.7V to 18V. Analog Devices ADR03 series extends to 4.5V to 36V, providing broader supply compatibility. Maxim MAX873 series is limited to 4.5V to 18V. Selection depends on the actual supply voltage available in the application circuit. If the supply voltage is below 4.5V, only REF5025AID or REF5025AIDG4 are suitable.

Q4: What is the significance of the temperature coefficient difference between parts?

Temperature coefficient (ppm/°C) indicates how much the output voltage changes per degree Celsius. The original REF5025AIDG4 has 8 ppm/°C. The ADR03BRZ offers superior 3 ppm/°C, meaning better stability across temperature variations. The MAX873BESA+ has 20 ppm/°C, indicating greater temperature sensitivity. For applications requiring high temperature stability over wide operating ranges, lower temperature coefficient is preferred.

Q5: Can MAX873AESA+ be used in applications requiring -40°C to 125°C operation?

No. The MAX873AESA+ is rated only to 85°C maximum operating temperature, making it unsuitable for applications requiring operation up to 125°C. The REF5025AID, ADR03BRZ, and ADR03ARZ all support the full -40°C to 125°C range and are appropriate for high-temperature applications.

Q6: What is the difference between Tube, Cut Tape & Digi-Reel, and Tape & Reel packaging?

These are supply format variations of the same component:

Tube: Components packaged in plastic tubes, typically 50-100 pieces per tube, suitable for manual assembly or small production runs.
Cut Tape & Digi-Reel: Components on tape that can be cut to length or supplied on a reel, offering flexibility for semi-automated assembly.
Tape & Reel (TR): Components on continuous reel format, optimized for high-speed automated pick-and-place assembly equipment.

All three formats contain functionally identical components. Selection depends on assembly process requirements, not electrical performance.

Q7: Are all substitute parts RoHS3 compliant?

Yes. All listed substitute parts are RoHS3 compliant and REACH unaffected, matching the environmental compliance profile of the original REF5025AIDG4. This ensures regulatory compliance for new designs.

Q8: Which substitute offers the lowest power consumption?

The MAX873AESA+ and MAX873BESA+ series offer the lowest supply current at 600 µA, compared to 1.2 mA for REF5025AIDG4 and 1 mA for ADR03 series. However, this advantage is offset by the limited operating temperature range (-40°C to 85°C) and higher temperature coefficient in the MAX873BESA+ variant.

Q9: What is the MSL (Moisture Sensitivity Level) rating and why does it matter?

MSL rating indicates moisture sensitivity for surface mount components. REF5025AIDG4 has MSL 2 (1 Year), meaning it must be used within one year of packaging opening. ADR03 and MAX873 series have MSL 1 (Unlimited), indicating superior moisture resistance with no time restriction after opening. For long-term inventory management, MSL 1 rated parts offer operational flexibility.

Q10: If I need the lowest noise performance, which substitute should I select?

The MAX873AESA+ and MAX873BESA+ series offer the lowest noise at 3.8 µVp-p (0.1Hz to 10Hz), compared to 7.5 µVpp/V for REF5025AIDG4 and 6 µVp-p for ADR03 series. However, the MAX873 series is limited to -40°C to 85°C operation. For applications requiring both low noise and full -40°C to 125°C temperature range, the ADR03BRZ at 6 µVp-p is the optimal choice.

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