REF3040AIDBZR Equivalent & Substitute Parts

Part Overview

The REF3040AIDBZR is a Series Voltage Reference IC manufactured by Texas Instruments, designed to provide a fixed 4.096V output with ±0.2% tolerance in a compact SOT-23-3 surface mount package. This component is classified as Active product status and is widely used in precision analog applications requiring stable voltage references.

Substitute parts become necessary when the primary part experiences supply constraints, obsolescence, or when design requirements demand alternative electrical characteristics such as lower temperature coefficients, reduced noise, or different output current capabilities.

Substiute Parts

REF3040AIDBZR

Texas InstrumentsIn Stock: 59499REF3040AIDBZR Datasheet

Current PartRFQ

REF3040AIDBZT

Texas InstrumentsIn Stock: 5137REF3040AIDBZT Datasheet

Parametric EquivalentRFQ

REF3040AIDBZTG4

Texas InstrumentsIn Stock: 3067REF3040AIDBZTG4 Datasheet

Parametric EquivalentRFQ

ISL21010CFH341Z-TK

Renesas Electronics CorporationIn Stock: 2480ISL21010CFH341Z-TK Datasheet

MFR RecommendedRFQ

ISL21080CIH315Z-TK

Renesas Electronics CorporationIn Stock: 64777ISL21080CIH315Z-TK Datasheet

MFR RecommendedRFQ

MAX6041AEUR+T

Analog Devices Inc./Maxim IntegratedIn Stock: 1964MAX6041AEUR+T Datasheet

MFR RecommendedRFQ

MAX6064AEUR+T

Analog Devices Inc./Maxim IntegratedIn Stock: 2901MAX6064AEUR+T Datasheet

MFR RecommendedRFQ

MAX6064BEUR+T

Analog Devices Inc./Maxim IntegratedIn Stock: 2418MAX6064BEUR+T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

• Output voltage matching (4.096V fixed)
• Tolerance specification (±0.2% or tighter)
• Package compatibility (SOT-23-3)
• Operating temperature range (-40°C ~ 125°C minimum)
• Input voltage range compatibility (4.146V ~ 5.5V minimum)

Parts are grouped into two categories:

Parametric Equivalents (Texas Instruments): REF3040AIDBZT and REF3040AIDBZTG4 maintain identical electrical specifications to the primary part, differing only in packaging format (Cut Tape vs. Tape & Reel) and product status.

Manufacturer Recommended Alternatives: ISL21010CFH341Z-TK, ISL21080CIH315Z-TK, MAX6041AEUR+T, MAX6064AEUR+T, and MAX6064BEUR+T provide equivalent or superior performance characteristics while meeting the core substitution criteria. These parts are sourced from Renesas Electronics Corporation and Analog Devices Inc./Maxim Integrated.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitution (Identical Specifications):

REF3040AIDBZT is the primary equivalent to REF3040AIDBZR, maintaining all electrical and thermal characteristics. Both parts are Active status and ROHS3 compliant. Selection between these two depends solely on packaging preference: Cut Tape & Digi-Reel® format for the original part versus alternative supplier packaging for REF3040AIDBZT.

REF3040AIDBZTG4 shares identical electrical specifications but carries Obsolete product status. This part is suitable only for legacy system maintenance or when existing inventory must be depleted.

Enhanced Performance Alternatives:

ISL21010CFH341Z-TK (Renesas) provides superior temperature coefficient performance (50ppm/°C vs. 75ppm/°C) while maintaining ±0.2% tolerance and 4.096V output. Operating temperature range extends to -40°C ~ 125°C, matching the primary part. This substitution improves long-term stability in temperature-sensitive applications.

MAX6064AEUR+T (Analog Devices) offers the lowest temperature coefficient (20ppm/°C) and reduced noise characteristics (50µVrms vs. 128µVrms). However, output current is limited to 5 mA compared to 25 mA, and maximum operating temperature is -40°C ~ 85°C. This part is suitable for low-current precision applications where thermal stability is critical.

MAX6041AEUR+T (Analog Devices) provides 500 µA output current with superior temperature coefficient (20ppm/°C) and extended input voltage range (4.296V ~ 12.6V). Operating temperature maximum is -40°C ~ 85°C. This part accommodates higher current loads while maintaining precision.

Not Recommended for Direct Substitution:

ISL21080CIH315Z-TK produces 1.5V output, incompatible with 4.096V requirement. This part is listed in the substitute database but does not meet the core voltage specification.

MAX6064BEUR+T has relaxed tolerance (±0.4% vs. ±0.2%), making it unsuitable for applications requiring ±0.2% accuracy.

Frequently Asked Questions (FAQ)

Q: Can REF3040AIDBZT replace REF3040AIDBZR directly?

A: Yes. Both parts are electrically identical with matching output voltage (4.096V), tolerance (±0.2%), temperature coefficient (75ppm/°C), and operating temperature range (-40°C ~ 125°C). Differences exist only in packaging format and inventory source.

Q: What is the key limitation when substituting with MAX6064AEUR+T?

A: Output current is reduced from 25 mA to 5 mA, and maximum operating temperature is limited to -40°C ~ 85°C instead of -40°C ~ 125°C. Applications requiring higher current output or extended temperature operation must use alternative parts.

Q: Does ISL21010CFH341Z-TK provide better performance than the primary part?

A: ISL21010CFH341Z-TK improves temperature coefficient performance (50ppm/°C vs. 75ppm/°C) while maintaining identical output voltage, tolerance, and operating temperature range. This results in superior long-term stability across temperature variations.

Q: Why is ISL21080CIH315Z-TK listed as a substitute if it has different output voltage?

A: ISL21080CIH315Z-TK is included in the manufacturer's substitute database but produces 1.5V output instead of 4.096V. This part is not suitable for direct substitution in applications requiring 4.096V reference voltage.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH Unaffected status, matching the environmental and regulatory requirements of the primary part.

Q: What packaging formats are available across substitute options?

A: REF3040AIDBZR and REF3040AIDBZT use Cut Tape (CT) & Digi-Reel® packaging. REF3040AIDBZTG4, ISL21010CFH341Z-TK, MAX6041AEUR+T, MAX6064AEUR+T, and MAX6064BEUR+T use Tape & Reel (TR) packaging. ISL21080CIH315Z-TK uses Cut Tape (CT) & Digi-Reel® packaging. All parts use SOT-23-3 case format.