REF3333AIDCKR Equivalent & Substitute Parts

Part Overview

The REF3333AIDCKR is a series voltage reference IC manufactured by Texas Instruments, designed to provide a fixed 3.3V output with ±0.15% tolerance. This component is classified as a Power Management (PMIC) device and is actively produced. The REF3333AIDCKR is essential in precision analog circuits requiring stable voltage references for data acquisition systems, analog-to-digital converters, and precision measurement applications. Substitute parts may be required due to inventory constraints, supply chain considerations, or specific application requirements while maintaining electrical and mechanical compatibility.

Substiute Parts

REF3333AIDCKR

Texas InstrumentsIn Stock: 17312REF3333AIDCKR Datasheet

Current PartRFQ

REF3333AIDCKT

Texas InstrumentsIn Stock: 15813REF3333AIDCKT Datasheet

Parametric EquivalentRFQ

MAX6034AEXR33+T

Analog Devices Inc./Maxim IntegratedIn Stock: 2903MAX6034AEXR33+T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the REF3333AIDCKR are identified based on strict electrical and mechanical parameter matching. The critical parameters that determine substitution eligibility are:

• Fixed output voltage of 3.3V
• SC-70 / SOT-323 package compatibility
• Surface mount mounting type
• Input voltage range of 4.6V ~ 5.5V
• Operating temperature range of -40°C to 125°C (or compatible subset)
• Active product status
• ROHS3 compliance

Substitutes are grouped into two categories: parametric equivalents (identical electrical specifications) and manufacturer-recommended alternatives (functionally compatible with minor parameter variations within acceptable tolerances for the application).

Parameter Comparison

Engineering Selection Recommendations

REF3333AIDCKT is a parametric equivalent to REF3333AIDCKR, manufactured by Texas Instruments with identical electrical specifications. Both devices maintain ±0.15% voltage tolerance, 30 ppm/°C temperature coefficient, and 8.5 µA supply current. The REF3333AIDCKT differs only in packaging designation (Digi-Reel versus Cut Tape), making it suitable for direct substitution in applications where packaging format is interchangeable. Both parts are Active status products with ROHS3 compliance.

MAX6034AEXR33+T is a manufacturer-recommended alternative from Analog Devices Inc./Maxim Integrated. This device maintains the same 3.3V fixed output, SC-70 package, and input voltage range. The MAX6034AEXR33+T exhibits a ±0.2% voltage tolerance (compared to ±0.15%), lower noise floor at 0.1Hz to 10Hz (73 µVp-p versus 92 µVp-p), but operates at higher supply current (125 µA versus 8.5 µA). The operating temperature range is limited to -40°C ~ 85°C. This substitute is appropriate for applications where the reduced upper temperature limit and higher supply current are acceptable, and where the improved noise performance provides benefit.

Frequently Asked Questions (FAQ)

Q: Can REF3333AIDCKT be used as a direct replacement for REF3333AIDCKR?

A: Yes. REF3333AIDCKT is a parametric equivalent with identical electrical specifications, including output voltage, tolerance, temperature coefficient, and supply current. The parts differ only in packaging format (Cut Tape versus Digi-Reel), which does not affect electrical performance or PCB-level compatibility.

Q: What are the key differences between REF3333AIDCKR and MAX6034AEXR33+T?

A: The primary differences are voltage tolerance (±0.15% versus ±0.2%), supply current (8.5 µA versus 125 µA), noise performance (92 µVp-p versus 73 µVp-p at 0.1Hz to 10Hz), and maximum operating temperature (125°C versus 85°C). Both maintain 3.3V output and SC-70 package compatibility.

Q: Is the MAX6034AEXR33+T suitable for high-temperature applications?

A: The MAX6034AEXR33+T operates to a maximum of 85°C, which is lower than the REF3333AIDCKR specification of 125°C. Applications requiring operation above 85°C require the REF3333AIDCKR or REF3333AIDCKT.

Q: Does the higher supply current of MAX6034AEXR33+T affect circuit design?

A: The MAX6034AEXR33+T draws 125 µA compared to 8.5 µA for the REF3333AIDCKR. In battery-powered or low-power applications, this difference may be significant. Power budget calculations should account for this 15× increase in quiescent current.

Q: Are all three parts pin-compatible?

A: Yes. All three parts use the SC-70 / SOT-323 package with identical pinout, enabling direct PCB-level substitution without layout modifications.

Q: What is the moisture sensitivity level (MSL) difference between these parts?

A: REF3333AIDCKR and REF3333AIDCKT are rated MSL 2 (1 Year), while MAX6034AEXR33+T is rated MSL 1 (Unlimited). MSL 1 provides superior moisture tolerance for extended storage and humid environments.