REF3112AIDBZRG4 Equivalent & Substitute Parts

Part Overview

The REF3112AIDBZRG4 is a series voltage reference IC from Texas Instruments, delivering a fixed 1.25V 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 device operates across a 1.8V to 5.5V input range with 10 mA output current capability and is suitable for precision analog applications requiring stable voltage references.

Key Parameters

Parameter	Value
Manufacturer Part Number	REF3112AIDBZRG4
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Voltage (Fixed)	1.25V
Tolerance	±0.2%
Output Current	10 mA
Input Voltage Range	1.8V ~ 5.5V
Supply Current	135µA
Temperature Coefficient	20ppm/°C
Operating Temperature	-40°C ~ 125°C
Package / Case	TO-236-3, SC-59, SOT-23-3
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the REF3112AIDBZRG4 is determined by the following critical parameters:

Output Voltage: Must be 1.25V fixed
Tolerance: ±0.2% or tighter
Output Current: Minimum 10 mA capability
Input Voltage Range: Must support 1.8V ~ 5.5V
Package: SOT-23-3 surface mount
Temperature Range: Operating across -40°C ~ 125°C

Substitute parts are grouped into two categories:

Category 1: Direct Texas Instruments Equivalents – Parts with identical electrical specifications and active product status, differing only in packaging format (tape & reel vs. bulk).

Category 2: Cross-Manufacturer Alternatives – Parts from Renesas Electronics and Analog Devices that meet the core functional requirements but may have variations in secondary parameters such as temperature coefficient, noise characteristics, or supply current.

Parameter Comparison

Parameter	REF3112AIDBZRG4	REF3112AIDBZR	REF3112AIDBZT	REF3112AQDBZRQ1	ISL60002DIH312Z-T7A	MAX6018AEUR12+T	MAX6018BEUR12+T
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Renesas Electronics	Analog Devices/Maxim	Analog Devices/Maxim
Output Voltage	1.25V	1.25V	1.25V	1.25V	1.25V	1.263V	1.263V
Tolerance	±0.2%	±0.2%	±0.2%	±0.2%	±0.4%	±0.2%	±0.4%
Output Current	10 mA	10 mA	10 mA	10 mA	7 mA	1 mA	1 mA
Input Voltage Range	1.8V ~ 5.5V	1.8V ~ 5.5V	1.8V ~ 5.5V	1.8V ~ 5.5V	2.7V ~ 5.5V	1.8V ~ 5.5V	1.8V ~ 5.5V
Supply Current	135µA	135µA	135µA	135µA	900nA	6µA	6µA
Temperature Coefficient	20ppm/°C	20ppm/°C	20ppm/°C	20ppm/°C	20ppm/°C	50ppm/°C	50ppm/°C
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: REF3112AIDBZR or REF3112AIDBZT

Both parts are direct functional equivalents from Texas Instruments with active product status. REF3112AIDBZR is available in Cut Tape and Digi-Reel packaging (29,101 units in stock), while REF3112AIDBZT is available in Cut Tape and Digi-Reel packaging (1,355 units in stock). These parts maintain identical electrical specifications to the obsolete REF3112AIDBZRG4, including 1.25V output, ±0.2% tolerance, 10 mA output current, and -40°C to 125°C operating range. Selection between these two should be based on packaging requirements and inventory availability.

Secondary Recommendation: REF3112AQDBZRQ1

This Texas Instruments part is qualified to AEC-Q100 automotive standards and carries the same electrical specifications as the primary recommendations. It is suitable for applications requiring automotive-grade components. Moisture Sensitivity Level is rated at 2 (1 Year) compared to MSL 1 for other variants. This part has 21,100 units in stock.

Alternative Consideration: ISL60002DIH312Z-T7A (Renesas Electronics)

This part provides functional substitution with the same 1.25V output and ±0.4% tolerance. Key differences include reduced output current (7 mA vs. 10 mA), narrower input voltage range (2.7V ~ 5.5V vs. 1.8V ~ 5.5V), and reduced operating temperature range (-40°C ~ 85°C vs. -40°C ~ 125°C). This option is suitable only for applications that do not require the full 10 mA output current or extended high-temperature operation above 85°C.

Alternative Consideration: MAX6018AEUR12+T or MAX6018BEUR12+T (Analog Devices/Maxim)

These parts offer significantly reduced supply current (6µA vs. 135µA) and are suitable for ultra-low-power applications. However, they have critical limitations: output current is only 1 mA (vs. 10 mA), output voltage is 1.263V (vs. 1.25V), operating temperature range is limited to -40°C ~ 85°C, and temperature coefficient is higher at 50ppm/°C. These parts are suitable only for low-current reference applications where the voltage offset and reduced temperature range are acceptable.

Frequently Asked Questions (FAQ)

Q: Can REF3112AIDBZR directly replace REF3112AIDBZRG4 in existing designs?

A: Yes. REF3112AIDBZR is electrically and functionally identical to REF3112AIDBZRG4. The primary difference is product status (active vs. obsolete) and packaging format. No circuit modifications are required.

Q: What is the difference between REF3112AIDBZR and REF3112AIDBZT?

A: Both parts have identical electrical specifications. The difference is in packaging format and supplier reel configuration. REF3112AIDBZR is available in Cut Tape and Digi-Reel format, while REF3112AIDBZT is also available in Cut Tape and Digi-Reel format. Selection should be based on procurement and assembly requirements.

Q: Is REF3112AQDBZRQ1 suitable for automotive applications?

A: Yes. REF3112AQDBZRQ1 is qualified to AEC-Q100 automotive standards and maintains the same electrical specifications as other REF3112 variants. It is specifically designed for automotive-grade applications.

Q: Can ISL60002DIH312Z-T7A be used as a drop-in replacement?

A: ISL60002DIH312Z-T7A is not a true drop-in replacement. While it provides the same 1.25V output voltage, it has reduced output current (7 mA vs. 10 mA), a narrower input voltage range (2.7V ~ 5.5V vs. 1.8V ~ 5.5V), and a limited operating temperature range (-40°C ~ 85°C vs. -40°C ~ 125°C). Use this part only if your application does not require the full 10 mA output current or extended high-temperature operation.

Q: Why do MAX6018AEUR12+T and MAX6018BEUR12+T have lower supply current?

A: The MAX6018 series is designed for ultra-low-power applications with supply current of only 6µA compared to 135µA for the REF3112 series. This comes at the cost of significantly reduced output current (1 mA vs. 10 mA) and higher temperature coefficient (50ppm/°C vs. 20ppm/°C). These parts are suitable only for low-current reference applications.

Q: What is the significance of the ±0.2% vs. ±0.4% tolerance difference?

A: Tolerance specifies the accuracy of the output voltage at room temperature. ±0.2% tolerance (REF3112AIDBZR, REF3112AIDBZT, REF3112AQDBZRQ1, MAX6018AEUR12+T) provides tighter voltage accuracy than ±0.4% tolerance (ISL60002DIH312Z-T7A, MAX6018BEUR12+T). Applications requiring high precision voltage references should use ±0.2% parts.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the difference between operating temperature ranges?

A: REF3112 variants operate from -40°C to 125°C, while ISL60002 and MAX6018 variants operate from -40°C to 85°C. Applications requiring operation above 85°C must use REF3112 series parts. For applications limited to 85°C or below, all parts are suitable.

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