REF3012AIDBZRG4 Equivalent & Substitute Parts

Part Overview

The REF3012AIDBZRG4 is a series voltage reference IC manufactured by 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 ongoing design support and procurement continuity. The device operates across a 1.8V to 5.5V input range with 25 mA output current capability and is suitable for precision analog applications requiring stable voltage references.

Key Parameters

Parameter	Value
Manufacturer Part Number	REF3012AIDBZRG4
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Voltage (Fixed)	1.25V
Output Current	25 mA
Tolerance	±0.2%
Temperature Coefficient	75 ppm/°C
Input Voltage Range	1.8V ~ 5.5V
Supply Current	50 µA
Operating Temperature	-40°C ~ 125°C
Package / Case	TO-236-3, SC-59, SOT-23-3
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the REF3012AIDBZRG4 is determined by the following critical parameters:

Primary Matching Criteria:

Output voltage: 1.25V fixed
Package type: SOT-23-3 surface mount
Reference type: Series voltage reference
Output type: Fixed

Secondary Compatibility Factors:

Tolerance specification (±0.2% or tighter)
Temperature coefficient performance
Input voltage range compatibility (minimum 1.8V to 5.5V)
Operating temperature range (-40°C to 125°C minimum)
Output current capability (minimum 25 mA)

Substitute parts are grouped into two categories: parametric equivalents from Texas Instruments with identical electrical specifications, and manufacturer-recommended alternatives from Renesas Electronics Corporation that meet the core functional requirements while offering enhanced performance characteristics in specific parameters such as tolerance, temperature coefficient, or supply current.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Tolerance	Temp Coeff	Input Range	Supply Current	Op Temp Range	Product Status
REF3012AIDBZRG4	Texas Instruments	1.25V	25 mA	±0.2%	75 ppm/°C	1.8V ~ 5.5V	50 µA	-40°C ~ 125°C	Obsolete
REF3012AIDBZR	Texas Instruments	1.25V	25 mA	±0.2%	75 ppm/°C	1.8V ~ 5.5V	50 µA	-40°C ~ 125°C	Active
REF3012AIDBZT	Texas Instruments	1.25V	25 mA	±0.2%	75 ppm/°C	1.8V ~ 5.5V	50 µA	-40°C ~ 125°C	Active
ISL21080DIH312Z-TK	Renesas Electronics	1.25V	7 mA	±0.6%	50 ppm/°C	2.7V ~ 5.5V	1.5 µA	-40°C ~ 85°C	Active
ISL60002DIH312Z-TK	Renesas Electronics	1.25V	7 mA	±0.2%	20 ppm/°C	2.7V ~ 5.5V	900 nA	-40°C ~ 85°C	Active
ISL60002DIH312Z-T7A	Renesas Electronics	1.25V	7 mA	±0.4%	20 ppm/°C	2.7V ~ 5.5V	900 nA	-40°C ~ 85°C	Active
ISL60002DIH311Z-TK	Renesas Electronics	1.2V	7 mA	±0.42%	20 ppm/°C	2.7V ~ 5.5V	900 nA	-40°C ~ 85°C	Active
ISL21080CIH315Z-TK	Renesas Electronics	1.5V	7 mA	±0.5%	50 ppm/°C	2.7V ~ 5.5V	1.5 µA	-40°C ~ 85°C	Active
ISL60002BIH312Z-TK	Renesas Electronics	1.25V	7 mA	±0.08%	20 ppm/°C	2.7V ~ 5.5V	900 nA	-40°C ~ 85°C	Active
ISL60002BIH311Z-TK	Renesas Electronics	1.2V	7 mA	±0.08%	20 ppm/°C	2.7V ~ 5.5V	900 nA	-40°C ~ 85°C	Active
ISL60002CIH312Z-TK	Renesas Electronics	1.25V	7 mA	±0.2%	20 ppm/°C	2.7V ~ 5.5V	900 nA	-40°C ~ 85°C	Active
ISL60002CIH311Z-TK	Renesas Electronics	1.2V	7 mA	±0.21%	20 ppm/°C	2.7V ~ 5.5V	900 nA	-40°C ~ 85°C	Active

Engineering Selection Recommendations

Direct Parametric Equivalents (Recommended Primary Choice):

REF3012AIDBZR and REF3012AIDBZT are direct parametric equivalents to the obsolete REF3012AIDBZRG4. Both parts maintain identical electrical specifications including 1.25V output, ±0.2% tolerance, 75 ppm/°C temperature coefficient, and 25 mA output current. Both are active products with ROHS3 compliance and unlimited moisture sensitivity rating. The primary difference is packaging format: REF3012AIDBZR is supplied in Cut Tape and Digi-Reel format, while REF3012AIDBZT is supplied in Cut Tape and Digi-Reel format. Selection between these two depends on procurement and assembly requirements.

Manufacturer-Recommended Alternatives (Renesas ISL Series):

The Renesas ISL60002 and ISL21080 series provide active alternatives with enhanced performance characteristics. ISL60002CIH312Z-TK matches the ±0.2% tolerance specification while offering superior temperature coefficient (20 ppm/°C versus 75 ppm/°C) and significantly lower supply current (900 nA versus 50 µA). However, output current is reduced to 7 mA and operating temperature range is limited to -40°C to 85°C. ISL60002BIH312Z-TK provides the tightest tolerance at ±0.08% with identical 1.25V output.

Compatibility Constraints:

Applications requiring the full 25 mA output current must use REF3012AIDBZR or REF3012AIDBZT, as Renesas alternatives are limited to 7 mA. Applications operating above 85°C must use Texas Instruments parts, which support -40°C to 125°C. Applications with minimum input voltage below 2.7V must use Texas Instruments parts, which support 1.8V minimum input.

Frequently Asked Questions (FAQ)

Q: Can ISL60002 series parts directly replace REF3012AIDBZRG4 in all applications?

A: Not universally. ISL60002 parts are limited to 7 mA output current compared to the 25 mA capability of REF3012AIDBZRG4. If your application requires output currents exceeding 7 mA, use REF3012AIDBZR or REF3012AIDBZT. Additionally, ISL60002 parts operate only to 85°C maximum, while REF3012 parts support 125°C.

Q: What is the difference between REF3012AIDBZR and REF3012AIDBZT?

A: Both parts are electrically identical with matching specifications. The difference is in packaging format. REF3012AIDBZR is supplied in Cut Tape and Digi-Reel format, while REF3012AIDBZT is also supplied in Cut Tape and Digi-Reel format. Selection depends on your procurement and assembly line requirements.

Q: Why do Renesas ISL60002 parts have lower supply current than REF3012?

A: The ISL60002 series uses advanced low-power design techniques, consuming only 900 nA supply current compared to 50 µA for REF3012. This is a design advantage for battery-powered or low-power applications, though it comes with reduced output current capability (7 mA maximum).

Q: Can I use ISL21080CIH315Z-TK as a substitute if my circuit uses 1.5V instead of 1.25V?

A: ISL21080CIH315Z-TK outputs 1.5V, not 1.25V. It is not a substitute for REF3012AIDBZRG4 unless your circuit design can accommodate the different output voltage. Verify your application's voltage requirements before selecting this part.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All parts listed—REF3012AIDBZR, REF3012AIDBZT, and all Renesas ISL series alternatives—are ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1).

Q: What is the minimum input voltage requirement for each substitute?

A: Texas Instruments REF3012 parts support 1.8V to 5.5V input range. Renesas ISL series parts support 2.7V to 5.5V input range. If your application operates below 2.7V input, you must use REF3012AIDBZR or REF3012AIDBZT.

Q: Which substitute offers the best temperature stability?

A: ISL60002 series parts offer superior temperature coefficient at 20 ppm/°C compared to 75 ppm/°C for REF3012 parts. For applications requiring minimal temperature drift, ISL60002CIH312Z-TK or ISL60002BIH312Z-TK are preferred, provided output current and temperature range requirements are met.

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