REF3025AIDBZRG4 Equivalent & Substitute Parts

Part Overview

The REF3025AIDBZRG4 is a series voltage reference IC from Texas Instruments, providing a fixed 2.5V output with ±0.2% tolerance in a SOT-23-3 surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The REF3025AIDBZRG4 serves applications requiring stable voltage references in power management circuits, analog signal conditioning, and precision measurement systems.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	REF3025AIDBZRG4
Category	Power Management (PMIC)
Product Status	Obsolete
Output Voltage	2.5V (Fixed)
Output Current	25 mA
Tolerance	±0.2%
Temperature Coefficient	75 ppm/°C
Input Voltage Range	2.55V ~ 5.5V
Supply Current	50 µA
Operating Temperature	-40°C ~ 125°C
Package	SOT-23-3 (TO-236-3, SC-59)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the REF3025AIDBZRG4 is determined by the following critical parameters:

Primary Substitution Criteria:

Output voltage: 2.5V fixed
Package type: SOT-23-3 surface mount
Tolerance: ±0.2% or better
Operating temperature range: -40°C ~ 125°C minimum
Input voltage compatibility: 2.55V ~ 5.5V or wider range

Substitution Categories:

Direct Equivalents (Texas Instruments REF3025 Series): Parts REF3025AIDBZR and REF3025AIDBZT maintain identical electrical specifications and package format. REF3025AIDBZR is actively manufactured, while REF3025AIDBZT is also active. These represent the primary replacement path for the obsolete REF3025AIDBZRG4.

Cross-Manufacturer Equivalents (Renesas ISL21010 Series): The ISL21010CFH325Z-TK from Renesas Electronics provides equivalent 2.5V output with ±0.2% tolerance in SOT-23-3 packaging. This part is actively produced and meets the same functional requirements, though with slightly different electrical characteristics (50 ppm/°C temperature coefficient versus 75 ppm/°C, and 100 µA supply current versus 50 µA).

Functional Alternatives (Analog Devices LT1460 Series): The LT1460HCS3-2.5#TRMPBF, LT1460HCS3-2.5#TRPBF, LT1460JCS3-2.5#TRMPBF, and LT1460JCS3-2.5#TRPBF provide 2.5V output in SOT-23-3 packaging with active product status. These parts offer higher output current capability (40 mA versus 25 mA) and superior temperature coefficient performance (20 ppm/°C). Tolerance varies between ±0.2% and ±0.4% depending on grade. Input voltage range extends to 20V, providing broader application flexibility. Operating temperature range is limited to 0°C ~ 70°C.

Limited Compatibility Alternative (Renesas ISL21080 Series): The ISL21080CIH315Z-TK provides a 1.5V fixed output with ±0.5% tolerance in SOT-23-3 packaging. This part is suitable only for applications where a lower reference voltage is acceptable and tolerance relaxation is permissible.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Tolerance	Output Current	Temp Coeff	Input Voltage	Supply Current	Operating Temp	Product Status
REF3025AIDBZRG4	Texas Instruments	2.5V	±0.2%	25 mA	75 ppm/°C	2.55V ~ 5.5V	50 µA	-40°C ~ 125°C	Obsolete
REF3025AIDBZR	Texas Instruments	2.5V	±0.2%	25 mA	75 ppm/°C	2.55V ~ 5.5V	50 µA	-40°C ~ 125°C	Active
REF3025AIDBZT	Texas Instruments	2.5V	±0.2%	25 mA	75 ppm/°C	2.55V ~ 5.5V	50 µA	-40°C ~ 125°C	Active
REF3025AIDBZTG4	Texas Instruments	2.5V	±0.2%	25 mA	75 ppm/°C	2.55V ~ 5.5V	50 µA	-40°C ~ 125°C	Obsolete
ISL21010CFH325Z-TK	Renesas Electronics	2.5V	±0.2%	25 mA	50 ppm/°C	2.6V ~ 5.5V	100 µA	-40°C ~ 125°C	Active
ISL21080CIH315Z-TK	Renesas Electronics	1.5V	±0.5%	7 mA	50 ppm/°C	2.7V ~ 5.5V	1.5 µA	-40°C ~ 85°C	Active
LT1460HCS3-2.5#TRMPBF	Analog Devices Inc.	2.5V	±0.2%	40 mA	20 ppm/°C	3.4V ~ 20V	175 µA	0°C ~ 70°C	Active
LT1460HCS3-2.5#TRPBF	Analog Devices Inc.	2.5V	±0.2%	40 mA	20 ppm/°C	3.4V ~ 20V	175 µA	0°C ~ 70°C	Active
LT1460JCS3-2.5#TRMPBF	Analog Devices Inc.	2.5V	±0.4%	40 mA	20 ppm/°C	3.4V ~ 20V	175 µA	0°C ~ 70°C	Active
LT1460JCS3-2.5#TRPBF	Analog Devices Inc.	2.5V	±0.4%	40 mA	20 ppm/°C	3.4V ~ 20V	175 µA	0°C ~ 70°C	Active
LT1460KCS3-2.5#TRMPBF	Analog Devices Inc.	2.5V	±0.5%	40 mA	50 ppm/°C	3.4V ~ 20V	175 µA	0°C ~ 70°C	Active

Engineering Selection Recommendations

Tier 1 - Direct Replacement: REF3025AIDBZR is the recommended primary substitute. This part maintains identical electrical specifications and package format as the obsolete REF3025AIDBZRG4, with active manufacturing status ensuring long-term availability. Packaging is available in Cut Tape (CT) and Digi-Reel® formats. No circuit redesign is required.

Tier 2 - Cross-Manufacturer Equivalent: ISL21010CFH325Z-TK from Renesas Electronics provides functional equivalence with identical 2.5V output, ±0.2% tolerance, and SOT-23-3 packaging. This part is actively produced and ROHS3 compliant. The slightly lower temperature coefficient (50 ppm/°C versus 75 ppm/°C) and higher supply current (100 µA versus 50 µA) are acceptable trade-offs for applications not requiring ultra-low power operation. No circuit redesign is required.

Tier 3 - Enhanced Performance Alternative: LT1460HCS3-2.5#TRMPBF and LT1460HCS3-2.5#TRPBF from Analog Devices offer superior temperature coefficient performance (20 ppm/°C) and higher output current capability (40 mA). These parts are actively produced and ROHS3 compliant. The operating temperature range is restricted to 0°C ~ 70°C, making them unsuitable for applications requiring the full -40°C ~ 125°C range of the original part. Input voltage range extends to 20V, providing broader application flexibility.

Tier 4 - Tolerance Trade-off Options: LT1460JCS3-2.5#TRMPBF and LT1460JCS3-2.5#TRPBF provide ±0.4% tolerance with the same performance benefits as Tier 3 parts. These are suitable for applications where relaxed tolerance is acceptable.

Not Recommended for Direct Substitution: ISL21080CIH315Z-TK provides a different output voltage (1.5V) and lower output current (7 mA), making it unsuitable as a direct replacement. This part is only applicable to designs requiring a 1.5V reference.

All recommended substitutes are ROHS3 compliant with MSL rating of 1 (Unlimited), matching the compliance profile of the original part.

Frequently Asked Questions (FAQ)

Q: Can REF3025AIDBZR be used as a direct drop-in replacement for REF3025AIDBZRG4?

A: Yes. REF3025AIDBZR is electrically and mechanically identical to REF3025AIDBZRG4, with the same 2.5V output, ±0.2% tolerance, 25 mA output current, and SOT-23-3 package. The primary difference is product status: REF3025AIDBZR is actively manufactured while REF3025AIDBZRG4 is obsolete. No circuit modifications are required.

Q: What is the difference between REF3025AIDBZR and REF3025AIDBZT?

A: Both parts are electrically identical with the same specifications. The difference is in packaging format: REF3025AIDBZR is supplied in Cut Tape (CT) and Digi-Reel® formats, while REF3025AIDBZT is supplied in Tape & Reel (TR) format. Selection depends on your procurement and assembly requirements.

Q: Can LT1460HCS3-2.5#TRMPBF replace REF3025AIDBZRG4 in all applications?

A: LT1460HCS3-2.5#TRMPBF provides 2.5V output with ±0.2% tolerance in SOT-23-3 packaging, making it functionally compatible. However, the operating temperature range is limited to 0°C ~ 70°C, compared to -40°C ~ 125°C for the original part. This part is unsuitable for applications requiring the full temperature range. Additionally, supply current is higher (175 µA versus 50 µA), which may impact power budget in battery-powered designs.

Q: Why does ISL21010CFH325Z-TK have higher supply current than REF3025AIDBZRG4?

A: ISL21010CFH325Z-TK draws 100 µA supply current compared to 50 µA for REF3025AIDBZRG4. This is an inherent characteristic of the Renesas design. For applications with strict power budgets, REF3025AIDBZR remains the preferred choice.

Q: Is ISL21080CIH315Z-TK a suitable substitute?

A: No. ISL21080CIH315Z-TK provides a 1.5V output, not 2.5V. It is only suitable for applications specifically designed for a 1.5V reference voltage. Output current is also limited to 7 mA. This part cannot replace REF3025AIDBZRG4 in standard 2.5V reference applications.

Q: What packaging formats are available for substitute parts?

A: REF3025AIDBZR is available in Cut Tape (CT) and Digi-Reel® formats. REF3025AIDBZT is available in Tape & Reel (TR) format. LT1460 series parts are supplied in Tape & Reel (TR) format. ISL21010CFH325Z-TK and ISL21080CIH315Z-TK are supplied in Tape & Reel (TR) format. Confirm packaging availability with your supplier based on assembly requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All recommended substitute parts listed are ROHS3 compliant with MSL rating of 1 (Unlimited), matching the compliance profile of REF3025AIDBZRG4.

Q: Which substitute offers the best temperature stability?

A: LT1460HCS3-2.5#TRMPBF and LT1460HCS3-2.5#TRPBF offer the lowest temperature coefficient at 20 ppm/°C, compared to 75 ppm/°C for REF3025AIDBZRG4 and 50 ppm/°C for ISL21010CFH325Z-TK. However, these parts are limited to 0°C ~ 70°C operating range.

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