REF1112AIDBZR Equivalent & Substitute Parts

Part Overview

The REF1112AIDBZR is a shunt voltage reference IC manufactured by Texas Instruments, designed for precision voltage reference applications requiring fixed 1.25V output with ±0.2% tolerance. This active product operates across the industrial temperature range of -40°C to 125°C and is packaged in SOT-23-3 surface mount configuration. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, design flexibility, or application-specific requirements.

Substiute Parts

REF1112AIDBZR

Texas InstrumentsIn Stock: 20336REF1112AIDBZR Datasheet

Current PartRFQ

REF1112AIDBZT

Texas InstrumentsIn Stock: 2090REF1112AIDBZT Datasheet

Parametric EquivalentRFQ

LM285D-1.2G

onsemiIn Stock: 1442LM285D-1.2G Datasheet

MFR RecommendedRFQ

MAX6006AEUR+T

Analog Devices Inc./Maxim IntegratedIn Stock: 2067MAX6006AEUR+T Datasheet

MFR RecommendedRFQ

MAX6006BEUR+T

Analog Devices Inc./Maxim IntegratedIn Stock: 2107MAX6006BEUR+T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the REF1112AIDBZR is determined by the following critical parameters:

Primary Substitution Criteria (Identical Parameters):

• Reference Type: Shunt
• Output Voltage: 1.25V fixed
• Tolerance: ±0.2%
• Package: SOT-23-3
• Mounting Type: Surface Mount
• Operating Temperature Range: -40°C to 125°C

Secondary Substitution Criteria (Allowable Variations):

• Output Current: Rated at 5 mA for REF1112AIDBZR; substitute parts may have different rated output currents provided the application does not exceed the substitute's maximum rating
• Temperature Coefficient: 15 ppm/°C for REF1112AIDBZR; higher values acceptable if application tolerance permits
• Noise Specifications: 25 µVp-p for REF1112AIDBZR; higher noise acceptable if application filtering is adequate

Non-Substitutable Parameters:

• Reference Type must remain Shunt
• Output Voltage must remain 1.25V
• Tolerance must not exceed ±0.2%
• Package must remain SOT-23-3
• Operating temperature range must encompass -40°C to 125°C

Parts that deviate from primary criteria are classified as functional alternatives requiring design review rather than direct substitutes.

Parameter Comparison

Engineering Selection Recommendations

Direct Parametric Equivalent: REF1112AIDBZT is a direct parametric equivalent to REF1112AIDBZR. Both parts are manufactured by Texas Instruments with identical electrical specifications (1.25V, ±0.2%, 5 mA, 15 ppm/°C) and package configuration (SOT-23-3). Both maintain the full operating temperature range of -40°C to 125°C and carry ROHS3 compliance. This substitute requires no design modification and is suitable for direct replacement.

Functional Equivalents with Design Considerations: MAX6006AEUR+T and MAX6006BEUR+T are manufactured by Analog Devices Inc./Maxim Integrated and share the 1.25V output voltage, SOT-23-3 package, and ROHS3 compliance. However, these parts operate only to 85°C maximum, reducing the upper temperature range by 40°C compared to the REF1112AIDBZR. Additionally, both MAX6006 variants are rated for 2 mA output current versus 5 mA for the REF1112AIDBZR. MAX6006AEUR+T maintains ±0.2% tolerance matching the primary part, while MAX6006BEUR+T has ±0.5% tolerance. These substitutes are suitable only for applications where the reduced temperature range and output current do not present constraints.

Alternative with Package Change: LM285D-1.2G manufactured by onsemi provides a shunt voltage reference with higher output current capability (20 mA) but requires package change from SOT-23-3 to 8-SOIC. The output voltage is 1.235V (within typical tolerance band of 1.25V nominal), tolerance is ±1%, and operating temperature range is -40°C to 85°C. This part is suitable only for applications permitting PCB layout modification and where the reduced tolerance and temperature range are acceptable.

Frequently Asked Questions (FAQ)

Q: Can REF1112AIDBZT be used as a direct replacement for REF1112AIDBZR? A: Yes. REF1112AIDBZT is a direct parametric equivalent with identical electrical specifications, package configuration, and operating temperature range. No design modification is required.

Q: What is the primary limitation of MAX6006AEUR+T and MAX6006BEUR+T as substitutes? A: Both MAX6006 variants operate only to 85°C maximum temperature, compared to 125°C for the REF1112AIDBZR. Applications requiring operation above 85°C cannot use these substitutes. Additionally, output current is limited to 2 mA versus 5 mA for the primary part.

Q: Can LM285D-1.2G replace REF1112AIDBZR without PCB modification? A: No. LM285D-1.2G uses an 8-SOIC package versus SOT-23-3 for the REF1112AIDBZR, requiring PCB layout changes. This part is suitable only for new designs or boards permitting package substitution.

Q: What tolerance specification should be verified when selecting a substitute? A: The REF1112AIDBZR specifies ±0.2% tolerance. Substitutes with equal or tighter tolerance (±0.2% or better) are directly compatible. Substitutes with looser tolerance (±0.5%, ±1%) require application-level tolerance analysis to confirm acceptability.

Q: Are all listed substitutes ROHS3 compliant? A: Yes. All substitute parts listed carry ROHS3 compliance matching the primary part REF1112AIDBZR.

Q: What is the significance of the temperature coefficient specification in substitute selection? A: Temperature coefficient (ppm/°C) indicates voltage drift over temperature. REF1112AIDBZR specifies 15 ppm/°C. Substitutes with higher temperature coefficients (30 ppm/°C, 75 ppm/°C, 80 ppm/°C) exhibit greater voltage variation across the operating range. Applications with tight voltage regulation requirements should prioritize substitutes with lower temperature coefficients.

Q: Can output current ratings be exceeded in substitute parts? A: No. Output current ratings represent maximum continuous current capability. Exceeding rated output current may cause device damage or performance degradation. Applications requiring 5 mA output current cannot use MAX6006 variants rated for 2 mA maximum.