REF3040TB-GT3 Equivalent & Substitute Parts

Part Overview

The REF3040TB-GT3 is a series voltage reference IC manufactured by onsemi, designed to provide a fixed 4.096V output with ±0.2% tolerance. This component is classified as a Power Management (PMIC) device and is packaged in SOT-23-3 surface mount configuration. The part is currently listed as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.

Substiute Parts

REF3040TB-GT3

onsemiIn Stock: 808REF3040TB-GT3 Datasheet

Current PartRFQ

REF3040AIDBZR

Texas InstrumentsIn Stock: 59499REF3040AIDBZR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the REF3040TB-GT3 is determined by the following critical parameters:

Fixed Substitution Criteria:

• Output voltage: 4.096V (exact match required)
• Reference type: Series voltage reference
• Tolerance: ±0.2% (exact match required)
• Package: SOT-23-3 surface mount
• Mounting type: Surface mount

Allowable Parameter Variations:

• Output current: May exceed the original 10 mA specification
• Temperature coefficient: May be lower (better performance)
• Input voltage range: May be wider or narrower, provided the operating range is compatible with the application
• Supply current: May be lower (improved efficiency)
• Operating temperature range: May be wider or narrower, depending on application requirements
• Noise specifications: May be lower (improved performance)

The REF3040AIDBZR from Texas Instruments meets all fixed substitution criteria and represents a direct functional equivalent with enhanced performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The REF3040AIDBZR from Texas Instruments is the primary substitute for the obsolete REF3040TB-GT3. This selection is based on:

Product Status: The REF3040AIDBZR maintains active production status, ensuring long-term availability and supply chain stability compared to the obsolete onsemi part.

Compliance & Certifications: The REF3040AIDBZR is ROHS3 compliant and carries REACH Unaffected status, meeting current regulatory requirements for electronic components.

Functional Equivalence: Both parts share identical output voltage (4.096V), tolerance (±0.2%), reference type (series), and package configuration (SOT-23-3), ensuring direct functional compatibility.

Performance Enhancement: The substitute part offers improved noise performance (45 µVp-p vs. 50 µVp-p in the 0.1Hz to 10Hz band) and an extended operating temperature range (-40°C to 125°C vs. -40°C to 85°C), providing additional design margin.

Application Considerations: The REF3040AIDBZR has a higher minimum input voltage (4.146V vs. 2.7V) and increased supply current (50 µA vs. 30 µA). Verify that the application's input voltage supply and power budget accommodate these specifications before implementation.

Frequently Asked Questions (FAQ)

Q: Can the REF3040AIDBZR directly replace the REF3040TB-GT3 without circuit modifications?

A: Yes, the REF3040AIDBZR is a direct pin-compatible substitute in SOT-23-3 packaging. However, verify that your application's input voltage supply meets the minimum 4.146V requirement, as this is higher than the original part's 2.7V minimum.

Q: What is the primary reason for substitution?

A: The REF3040TB-GT3 is obsolete. The REF3040AIDBZR is an active production part from Texas Instruments that meets all critical electrical and mechanical specifications.

Q: Are there differences in output current capability?

A: Yes. The REF3040AIDBZR provides 25 mA output current compared to the original 10 mA. This higher capability does not affect compatibility; it simply provides greater current sourcing capability if required by the application.

Q: How do the temperature coefficients compare?

A: The REF3040TB-GT3 has a temperature coefficient of 50 ppm/°C, while the REF3040AIDBZR is specified at 75 ppm/°C. Both values are acceptable for series voltage reference applications; the difference is minimal for most practical designs.

Q: Is the extended operating temperature range of the substitute part a concern?

A: No. The REF3040AIDBZR's extended range (-40°C to 125°C vs. -40°C to 85°C) provides additional design margin and is not a compatibility issue. Use the temperature range appropriate for your application requirements.

Q: What packaging options are available for the substitute?

A: The REF3040AIDBZR is supplied in Cut Tape (CT) and Digi-Reel® packaging formats, both in SOT-23-3 configuration, matching the original part's surface mount package.