REF1112AIDBZRG4 Equivalent & Substitute Parts

Part Overview

The REF1112AIDBZRG4 is a shunt 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 component is classified as obsolete, making equivalent substitute parts necessary for new designs and production continuity. The part operates across the industrial temperature range of -40°C to 125°C and is ROHS3 compliant with unlimited moisture sensitivity rating.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Fixed
Voltage - Output (Min/Fixed)	1.25V
Current - Output	5 mA
Tolerance	±0.2%
Temperature Coefficient	15ppm/°C Typical
Noise - 0.1Hz to 10Hz	25µVp-p
Current - Cathode	1.2 µA
Operating Temperature	-40°C ~ 125°C (TA)
Package / Case	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the REF1112AIDBZRG4 is determined by the following critical parameters:

Reference Output Voltage: 1.25V fixed
Package Type: SOT-23-3 surface mount
Tolerance: ±0.2% (primary specification)
Output Current Capability: 5 mA minimum
Temperature Range: -40°C to 125°C minimum
Compliance: ROHS3 and REACH requirements

Substitute parts are grouped into two categories:

Category 1 - Direct Parametric Equivalents (Texas Instruments REF1112 Series) Parts REF1112AIDBZR and REF1112AIDBZT maintain identical electrical specifications including 1.25V output, ±0.2% tolerance, 5 mA output current, and 15ppm/°C temperature coefficient. These differ only in product status (active vs. obsolete) and packaging format (Digi-Reel vs. standard tape).

Category 2 - Functional Equivalents with Parameter Deviations (Analog Devices MAX6006 Series) Parts MAX6006AEUR+T and MAX6006BEUR+T provide 1.25V fixed output in SOT-23-3 packaging but with reduced output current (2 mA vs. 5 mA), higher temperature coefficients (30-75ppm/°C vs. 15ppm/°C), and limited temperature range (-40°C to 85°C vs. 125°C). These are suitable only when application requirements permit the specified deviations.

Parameter Comparison

Parameter	REF1112AIDBZRG4 (Main)	REF1112AIDBZR	REF1112AIDBZT	MAX6006AEUR+T	MAX6006BEUR+T
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated
Product Status	Obsolete	Active	Active	Active	Active
Voltage - Output (Min/Fixed)	1.25V	1.25V	1.25V	1.25V	1.25V
Current - Output	5 mA	5 mA	5 mA	2 mA	2 mA
Tolerance	±0.2%	±0.2%	±0.2%	±0.2%	±0.5%
Temperature Coefficient	15ppm/°C Typical	15ppm/°C Typical	15ppm/°C Typical	30ppm/°C	75ppm/°C
Noise - 0.1Hz to 10Hz	25µVp-p	25µVp-p	25µVp-p	30µVp-p	30µVp-p
Current - Cathode	1.2 µA	1.2 µA	1.2 µA	1 µA	1 µA
Operating Temperature	-40°C ~ 125°C (TA)	-40°C ~ 125°C (TA)	-40°C ~ 125°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Package / Case	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Direct Replacement (Preferred)

REF1112AIDBZR and REF1112AIDBZT are the primary substitutes for REF1112AIDBZRG4. Both maintain identical electrical performance across all critical parameters including 1.25V output, ±0.2% tolerance, 5 mA output current, and 15ppm/°C temperature coefficient. Both are active products with ROHS3 compliance and unlimited MSL rating. REF1112AIDBZR is available in higher inventory (20,310 pcs) compared to REF1112AIDBZT (2,058 pcs), making it the preferred choice for production continuity.

For Constrained Applications

MAX6006AEUR+T and MAX6006BEUR+T from Analog Devices are functional alternatives when application requirements permit deviations in output current (2 mA vs. 5 mA), temperature coefficient (30-75ppm/°C vs. 15ppm/°C), and maximum operating temperature (85°C vs. 125°C). MAX6006AEUR+T maintains ±0.2% tolerance matching the original specification, while MAX6006BEUR+T operates at ±0.5% tolerance. Both are active products with ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can REF1112AIDBZR directly replace REF1112AIDBZRG4 without circuit modifications?

A: Yes. REF1112AIDBZR is a direct parametric equivalent with identical output voltage (1.25V), tolerance (±0.2%), output current (5 mA), temperature coefficient (15ppm/°C), and operating temperature range (-40°C to 125°C). The only differences are product status (active vs. obsolete) and packaging format. No circuit modifications are required.

Q: What are the key differences between REF1112AIDBZT and REF1112AIDBZR?

A: Both parts are electrically identical with matching 1.25V output, ±0.2% tolerance, 5 mA output current, and 15ppm/°C temperature coefficient. The difference lies in ECCN classification (5A991B1 vs. EAR99) and packaging format. REF1112AIDBZR is available in higher quantities.

Q: When should MAX6006AEUR+T be considered as a substitute?

A: MAX6006AEUR+T is suitable when the application can tolerate reduced output current (2 mA instead of 5 mA), higher temperature coefficient (30ppm/°C instead of 15ppm/°C), and maximum operating temperature limited to 85°C instead of 125°C. The ±0.2% tolerance matches the original specification.

Q: What is the difference between MAX6006AEUR+T and MAX6006BEUR+T?

A: Both parts share identical output current (2 mA), temperature range (-40°C to 85°C), and package type (SOT-23-3). The primary difference is tolerance: MAX6006AEUR+T operates at ±0.2% while MAX6006BEUR+T operates at ±0.5%. MAX6006BEUR+T also has a significantly higher temperature coefficient (75ppm/°C vs. 30ppm/°C).

Q: Are all substitute parts ROHS3 compliant?

A: Yes. REF1112AIDBZR, REF1112AIDBZT, MAX6006AEUR+T, and MAX6006BEUR+T are all ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1), matching the original REF1112AIDBZRG4 specification.

Q: Can these parts be used in high-temperature applications above 85°C?

A: REF1112AIDBZR and REF1112AIDBZT are rated to 125°C and are suitable for high-temperature applications. MAX6006AEUR+T and MAX6006BEUR+T are limited to 85°C maximum operating temperature and are not suitable for applications requiring operation above this threshold.

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