REF2933AIDBZTG4 Equivalent & Substitute Parts

Part Overview

The REF2933AIDBZTG4 is a series voltage reference IC from Texas Instruments, delivering a fixed 3.3V output with ±2% tolerance in a SOT-23-3 surface mount package. This component is classified as discontinued at DiGi Electronics, necessitating identification of active equivalent and substitute parts for ongoing production and design requirements. The part operates across -40°C to 125°C with 25 mA output current capability and is ROHS3 compliant with MSL 1 rating.

Substiute Parts

REF2933AIDBZTG4

Texas InstrumentsIn Stock: 4310REF2933AIDBZTG4 Datasheet

Current PartRFQ

REF2933AIDBZR

Texas InstrumentsIn Stock: 32479REF2933AIDBZR Datasheet

Parametric EquivalentRFQ

REF2933AIDBZT

Texas InstrumentsIn Stock: 1282REF2933AIDBZT Datasheet

Parametric EquivalentRFQ

ISL21080CIH315Z-TK

Renesas Electronics CorporationIn Stock: 64777ISL21080CIH315Z-TK Datasheet

MFR RecommendedRFQ

ISL21080CIH333Z-TK

Renesas Electronics CorporationIn Stock: 1262ISL21080CIH333Z-TK Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters: output voltage (3.3V fixed), package type (SOT-23-3), mounting method (surface mount), and compliance certifications (ROHS3, REACH Unaffected). Parts are grouped into two categories:

Parametric Equivalents (REF2933 Series): REF2933AIDBZR and REF2933AIDBZT share identical electrical specifications with the main part—3.3V fixed output, ±2% tolerance, 25 mA output current, 100ppm/°C temperature coefficient, and SOT-23-3 packaging. These parts differ only in product status (active vs. discontinued) and packaging format (Digi-Reel vs. tube).

Manufacturer Recommended Alternatives (ISL21080 Series): ISL21080CIH315Z-TK and ISL21080CIH333Z-TK are Renesas Electronics alternatives with the same SOT-23-3 package and surface mount configuration. ISL21080CIH333Z-TK matches the 3.3V output voltage but offers superior tolerance (±0.2% vs. ±2%) and lower temperature coefficient (50ppm/°C vs. 100ppm/°C). ISL21080CIH315Z-TK provides a 1.5V output and is not a direct voltage substitute.

Parameter Comparison

Engineering Selection Recommendations

Direct Replacement (Parametric Equivalents): REF2933AIDBZR and REF2933AIDBZT are functionally identical to the discontinued REF2933AIDBZTG4. Both are active products with identical electrical performance, tolerance, and temperature characteristics. REF2933AIDBZR offers higher inventory availability (32,400 pcs) compared to REF2933AIDBZT (1,267 pcs). Selection between these two should be based on packaging preference and supply chain availability.

Enhanced Performance Alternative: ISL21080CIH333Z-TK provides superior performance specifications with ±0.2% tolerance and 50ppm/°C temperature coefficient, compared to ±2% and 100ppm/°C of the original part. However, this substitute has reduced output current capability (7 mA vs. 25 mA) and narrower operating temperature range (-40°C to 85°C vs. -40°C to 125°C). This part is suitable only for applications where lower output current and reduced temperature range are acceptable.

Not Recommended: ISL21080CIH315Z-TK outputs 1.5V and is not a voltage substitute for the 3.3V requirement.

Frequently Asked Questions (FAQ)

Q: Can REF2933AIDBZR or REF2933AIDBZT be used as direct replacements for REF2933AIDBZTG4?

A: Yes. Both parts are parametric equivalents with identical output voltage (3.3V), tolerance (±2%), output current (25 mA), temperature coefficient (100ppm/°C), and SOT-23-3 packaging. The only differences are product status (active vs. discontinued) and packaging format. No circuit modifications are required.

Q: What are the limitations of ISL21080CIH333Z-TK as a substitute?

A: ISL21080CIH333Z-TK has reduced output current (7 mA vs. 25 mA) and a narrower operating temperature range (-40°C to 85°C vs. -40°C to 125°C). Applications requiring the full 25 mA output or operation above 85°C cannot use this part. However, it offers superior tolerance and lower temperature coefficient for precision applications within its operating limits.

Q: Are all substitute parts available in the same SOT-23-3 package?

A: Yes. All listed substitute parts use the SOT-23-3 (TO-236-3, SC-59) surface mount package, ensuring mechanical and electrical compatibility with existing PCB layouts.

Q: Do all parts meet the same compliance requirements?

A: Yes. All parts listed are ROHS3 compliant, REACH unaffected, and have MSL 1 (unlimited) moisture sensitivity rating, matching the compliance profile of the original REF2933AIDBZTG4.

Q: Which substitute should I select for new designs?

A: For direct replacement with identical performance, select REF2933AIDBZR or REF2933AIDBZT based on inventory and packaging availability. For applications requiring higher precision and lower temperature drift within the reduced current and temperature range, ISL21080CIH333Z-TK is suitable.