REF2940AIDBZRG4 Equivalent & Substitute Parts

Part Overview

The REF2940AIDBZRG4 is a Series Voltage Reference IC from Texas Instruments, delivering a fixed 4.096V output with ±2% tolerance in a SOT-23-3 surface mount package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design requirements and production continuity. The device operates across -40°C to 125°C with 25 mA output current capability and 59 µA supply current, making it suitable for precision analog applications requiring stable voltage references.

Substiute Parts

REF2940AIDBZRG4

Texas InstrumentsIn Stock: 7633REF2940AIDBZRG4 Datasheet

Current PartRFQ

REF2940AIDBZR

Texas InstrumentsIn Stock: 9707REF2940AIDBZR Datasheet

Parametric EquivalentRFQ

REF2940AIDBZT

Texas InstrumentsIn Stock: 1213REF2940AIDBZT 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

Key Parameters

Substitute Part Grouping Explanation

Substitution of the REF2940AIDBZRG4 is determined by the following critical parameters: output voltage (4.096V fixed), output current capability (25 mA), tolerance specification (±2%), package type (SOT-23-3), and operating temperature range (-40°C to 125°C). Parts are grouped into two categories:

Parametric Equivalents (Direct Substitutes): Parts with identical electrical specifications and packaging. These include REF2940AIDBZR and REF2940AIDBZT, which differ only in packaging format (Cut Tape vs. Tape & Reel) but maintain all electrical parameters.

Manufacturer Recommended Alternatives: Parts from alternative manufacturers (Renesas Electronics Corporation) that provide the same 4.096V output voltage and SOT-23-3 package but with enhanced specifications (tighter tolerance, lower temperature coefficient, reduced noise). These parts are suitable where improved performance margins are acceptable within the design.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement: REF2940AIDBZR and REF2940AIDBZT are the primary substitutes, offering identical electrical performance and active product status. Selection between these two depends on packaging requirements: REF2940AIDBZR is supplied in Cut Tape format, while REF2940AIDBZT is supplied in Tape & Reel format. Both maintain ROHS3 compliance and MSL Level 1 rating.

For Enhanced Performance Applications: ISL21010CFH341Z-TK from Renesas Electronics provides superior specifications with ±0.2% tolerance (versus ±2%), 50 ppm/°C temperature coefficient (versus 100 ppm/°C), and lower noise characteristics (56 µVrms versus 128 µVrms in the 10Hz to 10kHz band). This part is suitable for applications requiring tighter voltage accuracy and improved temperature stability. The increased supply current (100 µA versus 59 µA) and slightly higher input voltage floor (4.2V versus 4.146V) must be evaluated against design constraints.

All recommended substitutes maintain SOT-23-3 packaging, surface mount compatibility, and compliance certifications equivalent to the original part.

Frequently Asked Questions (FAQ)

Q: Can REF2940AIDBZR and REF2940AIDBZT be used interchangeably with REF2940AIDBZRG4?

A: Yes. These parts are parametric equivalents with identical electrical specifications. The suffix differences indicate packaging format only: G denotes Digi-Reel packaging (original), R denotes Cut Tape, and T denotes Tape & Reel. All three maintain the same 4.096V output, ±2% tolerance, and SOT-23-3 package footprint.

Q: Is ISL21010CFH341Z-TK a direct substitute?

A: ISL21010CFH341Z-TK is a functional substitute with the same 4.096V output voltage and SOT-23-3 package, but with enhanced electrical specifications. It is not a direct pin-for-pin replacement in terms of performance characteristics. The tighter tolerance (±0.2% versus ±2%) and lower temperature coefficient (50 ppm/°C versus 100 ppm/°C) make it suitable for precision applications. However, the increased supply current (100 µA versus 59 µA) must be considered in power budget calculations.

Q: What are the key parameters that determine substitutability?

A: The critical parameters are: fixed output voltage (4.096V), output current capability (25 mA), SOT-23-3 package type, and operating temperature range (-40°C to 125°C). Parts meeting these specifications are considered functionally compatible. Tolerance, temperature coefficient, and noise specifications may vary between substitutes and should be evaluated against application requirements.

Q: Are all recommended substitutes RoHS compliant?

A: Yes. REF2940AIDBZR, REF2940AIDBZT, and ISL21010CFH341Z-TK are all ROHS3 compliant with MSL Level 1 rating, matching the compliance profile of the original REF2940AIDBZRG4.

Q: What is the difference between Cut Tape and Tape & Reel packaging?

A: Cut Tape (CT) and Tape & Reel (TR) are distribution formats for surface mount components. Cut Tape is supplied in smaller quantities on individual tape segments, suitable for prototyping and low-volume production. Tape & Reel is supplied in continuous reel format for high-volume automated assembly. Both formats contain identical components; the choice depends on production volume and assembly equipment compatibility.