REF3125AIDBZRG4 Equivalent & Substitute Parts

Part Overview

The REF3125AIDBZRG4 is a series voltage reference IC from Texas Instruments, delivering a fixed 2.5V output with ±0.2% tolerance in a compact SOT-23-3 surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The device operates across a -40°C to 125°C temperature range with 10 mA output current capability and is fully RoHS3 compliant.

Key Parameters

Parameter	Value
Manufacturer Part Number	REF3125AIDBZRG4
Manufacturer	Texas Instruments
Output Voltage (Fixed)	2.5V
Output Current	10 mA
Tolerance	±0.2%
Temperature Coefficient	20 ppm/°C
Input Voltage Range	2.55V ~ 5.5V
Supply Current	135 µA
Operating Temperature	-40°C ~ 125°C
Package	SOT-23-3
Product Status	Obsolete
RoHS Status	RoHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the REF3125AIDBZRG4 is determined by the following critical parameters:

Primary Substitution Criteria:

Fixed output voltage of 2.5V
Tolerance of ±0.2% or tighter
SOT-23-3 package compatibility
Surface mount mounting type
RoHS3 compliance

Substitution Categories:

Category 1: Parametric Equivalents (Texas Instruments REF3125 Series) Parts REF3125AIDBZR and REF3125AIDBZT are direct parametric equivalents with identical electrical specifications. REF3125AQDBZRQ1 is an automotive-grade variant (AEC-Q100 qualified) with the same core parameters but extended qualification for automotive applications.

Category 2: Manufacturer Recommended Alternatives (Analog Devices LT1460 Series) The LT1460HCS3-2.5#TRMPBF, LT1460HCS3-2.5#TRPBF, LT1460JCS3-2.5#TRMPBF, LT1460JCS3-2.5#TRPBF, LT1460KCS3-2.5#TRMPBF, and LT1460KCS3-2.5#TRPBF variants share the 2.5V fixed output and SOT-23-3 package. These parts differ in output current capability (40 mA vs. 10 mA), tolerance grades (±0.2% to ±0.5%), and input voltage range (3.4V ~ 20V vs. 2.55V ~ 5.5V).

Category 3: Manufacturer Recommended Alternative (Analog Devices MAX6025AEUR+T) The MAX6025AEUR+T provides 2.5V fixed output with ±0.2% tolerance and SOT-23-3 packaging. It differs in output current (500 µA vs. 10 mA), input voltage range (2.7V ~ 12.6V), and supply current (35 µA vs. 135 µA).

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Tolerance	Temp Coeff	Input Voltage	Supply Current	Operating Temp	Package	Status
REF3125AIDBZRG4	Texas Instruments	2.5V	10 mA	±0.2%	20 ppm/°C	2.55V ~ 5.5V	135 µA	-40°C ~ 125°C	SOT-23-3	Obsolete
REF3125AIDBZR	Texas Instruments	2.5V	10 mA	±0.2%	20 ppm/°C	2.55V ~ 5.5V	135 µA	-40°C ~ 125°C	SOT-23-3	Active
REF3125AIDBZT	Texas Instruments	2.5V	10 mA	±0.2%	20 ppm/°C	2.55V ~ 5.5V	135 µA	-40°C ~ 125°C	SOT-23-3	Active
REF3125AQDBZRQ1	Texas Instruments	2.5V	10 mA	±0.2%	20 ppm/°C	2.55V ~ 5.5V	135 µA	-40°C ~ 125°C	SOT-23-3	Active
LT1460HCS3-2.5#TRMPBF	Analog Devices Inc.	2.5V	40 mA	±0.2%	20 ppm/°C	3.4V ~ 20V	175 µA	0°C ~ 70°C	SOT-23-3	Active
LT1460HCS3-2.5#TRPBF	Analog Devices Inc.	2.5V	40 mA	±0.2%	20 ppm/°C	3.4V ~ 20V	175 µA	0°C ~ 70°C	SOT-23-3	Active
LT1460JCS3-2.5#TRMPBF	Analog Devices Inc.	2.5V	40 mA	±0.4%	20 ppm/°C	3.4V ~ 20V	175 µA	0°C ~ 70°C	SOT-23-3	Active
LT1460JCS3-2.5#TRPBF	Analog Devices Inc.	2.5V	40 mA	±0.4%	20 ppm/°C	3.4V ~ 20V	175 µA	0°C ~ 70°C	SOT-23-3	Active
LT1460KCS3-2.5#TRMPBF	Analog Devices Inc.	2.5V	40 mA	±0.5%	50 ppm/°C	3.4V ~ 20V	175 µA	0°C ~ 70°C	SOT-23-3	Active
LT1460KCS3-2.5#TRPBF	Analog Devices Inc.	2.5V	40 mA	±0.5%	50 ppm/°C	3.4V ~ 20V	175 µA	0°C ~ 70°C	SOT-23-3	Active
MAX6025AEUR+T	Analog Devices Inc./Maxim Integrated	2.5V	500 µA	±0.2%	20 ppm/°C	2.7V ~ 12.6V	35 µA	-40°C ~ 85°C	SOT-23-3	Active

Engineering Selection Recommendations

Direct Replacement (Identical Specifications): REF3125AIDBZR and REF3125AIDBZT are active production equivalents with identical electrical and thermal characteristics to the obsolete REF3125AIDBZRG4. Both maintain the same input voltage range (2.55V ~ 5.5V), output current (10 mA), tolerance (±0.2%), and operating temperature range (-40°C ~ 125°C). These are the preferred substitutes for direct board-level replacement.

Automotive-Grade Alternative: REF3125AQDBZRQ1 is an AEC-Q100 qualified automotive variant with identical core specifications. This part is suitable for applications requiring automotive qualification and extended temperature performance.

Higher Output Current Alternatives: The LT1460 series (HCS3, JCS3, KCS3 variants) provides 40 mA output current compared to the original 10 mA specification. These parts are suitable only when higher output current is required or acceptable. The LT1460HCS3-2.5 variants maintain ±0.2% tolerance matching the original part. The LT1460JCS3-2.5 variants have ±0.4% tolerance, and LT1460KCS3-2.5 variants have ±0.5% tolerance with 50 ppm/°C temperature coefficient. All LT1460 variants operate at 0°C ~ 70°C, which is narrower than the original -40°C ~ 125°C range.

Low Supply Current Alternative: The MAX6025AEUR+T offers the lowest supply current (35 µA vs. 135 µA) with ±0.2% tolerance and 2.5V output. This part is suitable for power-sensitive applications. The output current is 500 µA, significantly higher than the original 10 mA specification. Operating temperature range is -40°C ~ 85°C.

All substitute parts are RoHS3 compliant and available in SOT-23-3 packaging.

Frequently Asked Questions (FAQ)

Q: Can I use REF3125AIDBZR as a direct replacement for REF3125AIDBZRG4? A: Yes. REF3125AIDBZR is an active production equivalent with identical electrical specifications, including 2.5V output, ±0.2% tolerance, 10 mA output current, and -40°C ~ 125°C operating range. The only difference is product status (active vs. obsolete).

Q: What is the difference between REF3125AIDBZR and REF3125AIDBZT? A: Both parts are parametric equivalents with identical electrical characteristics. The difference is in packaging format: REF3125AIDBZR is available in Cut Tape (CT) & Digi-Reel format, while REF3125AIDBZT is also available in Cut Tape & Digi-Reel format. Electrical performance is identical.

Q: When should I use REF3125AQDBZRQ1 instead of REF3125AIDBZR? A: Use REF3125AQDBZRQ1 when your application requires automotive-grade components with AEC-Q100 qualification. It maintains identical electrical specifications but includes automotive qualification documentation.

Q: Can I substitute an LT1460 series part for the REF3125AIDBZRG4? A: LT1460 series parts share the 2.5V output and SOT-23-3 package but have different operating characteristics. The LT1460 provides 40 mA output current (vs. 10 mA), operates at 0°C ~ 70°C (vs. -40°C ~ 125°C), and has a higher input voltage minimum of 3.4V (vs. 2.55V). Use LT1460 only if your circuit can accommodate these differences.

Q: What is the difference between LT1460HCS3-2.5, LT1460JCS3-2.5, and LT1460KCS3-2.5? A: These variants differ in tolerance and temperature coefficient. LT1460HCS3-2.5 has ±0.2% tolerance with 20 ppm/°C. LT1460JCS3-2.5 has ±0.4% tolerance with 20 ppm/°C. LT1460KCS3-2.5 has ±0.5% tolerance with 50 ppm/°C. All other parameters are identical.

Q: Is MAX6025AEUR+T compatible with the REF3125AIDBZRG4? A: MAX6025AEUR+T shares the 2.5V output, ±0.2% tolerance, and SOT-23-3 package. However, it has significantly different operating characteristics: 500 µA output current (vs. 10 mA), 35 µA supply current (vs. 135 µA), and -40°C ~ 85°C operating range (vs. -40°C ~ 125°C). Use only if your application can accept these parameter differences.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts are RoHS3 compliant, matching the compliance status of the original REF3125AIDBZRG4.

Q: What packaging formats are available for the substitute parts? A: REF3125AIDBZR and REF3125AIDBZT are available in Cut Tape (CT) & Digi-Reel format. LT1460 series parts are available in Tape & Reel (TR) format. MAX6025AEUR+T is available in Cut Tape (CT) & Digi-Reel format. All are surface mount SOT-23-3 packages.

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