REF3033TB-GT3 Equivalent & Substitute Parts

Part Overview

The REF3033TB-GT3 is a series voltage reference IC manufactured by onsemi, designed to provide a fixed 3.3V output with ±0.2% tolerance in a compact SOT-23-3 surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part delivers 10 mA output current and operates across a -40°C to 85°C temperature range, suitable for precision analog applications requiring stable voltage references.

Substiute Parts

REF3033TB-GT3

onsemiIn Stock: 1102REF3033TB-GT3 Datasheet

Current PartRFQ

ISL21080CIH333Z-TK

Renesas Electronics CorporationIn Stock: 1262ISL21080CIH333Z-TK Datasheet

SimilarRFQ

REF3033AIDBZR

Texas InstrumentsIn Stock: 89236REF3033AIDBZR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the REF3033TB-GT3 are qualified based on the following electrical and mechanical parameters:

• Fixed output voltage of 3.3V
• Voltage tolerance of ±0.2%
• SOT-23-3 package compatibility
• Surface mount technology
• Operating temperature range of -40°C minimum to 85°C minimum
• Input voltage range overlap with 2.7V ~ 5.5V specification

The REF3033AIDBZR (Texas Instruments) and ISL21080CIH333Z-TK (Renesas Electronics Corporation) meet these core substitution criteria. Both parts maintain the same output voltage, tolerance, and package form factor while offering active product status and enhanced availability compared to the obsolete REF3033TB-GT3.

Parameter Comparison

Engineering Selection Recommendations

The REF3033AIDBZR from Texas Instruments is the primary substitute for the obsolete REF3033TB-GT3. This part maintains identical output voltage and tolerance specifications while offering active product status, ROHS3 compliance, and significantly higher inventory availability (89,200 pieces in stock). The extended operating temperature range to 125°C provides additional design margin for applications requiring higher temperature operation. The higher output current capability (25 mA versus 10 mA) ensures compatibility with designs requiring moderate load currents.

The ISL21080CIH333Z-TK from Renesas Electronics Corporation serves as an alternative substitute, particularly for applications prioritizing low supply current consumption (1.5 µA versus 30 µA). This part delivers superior noise performance (30 µVp-p at 0.1Hz to 10Hz) and maintains the same temperature coefficient as the original part. The lower output current rating (7 mA) is suitable for low-power reference applications.

Both substitute parts are available in active production status with REACH compliance and identical packaging specifications, ensuring direct mechanical and electrical compatibility with the REF3033TB-GT3 footprint.

Frequently Asked Questions (FAQ)

Q: Can the REF3033AIDBZR directly replace the REF3033TB-GT3 in existing designs?

A: Yes. Both parts share identical output voltage (3.3V), voltage tolerance (±0.2%), and SOT-23-3 package specifications. The REF3033AIDBZR is pin-compatible and functionally equivalent for applications requiring up to 10 mA output current.

Q: What is the key difference between the REF3033AIDBZR and ISL21080CIH333Z-TK substitutes?

A: The REF3033AIDBZR provides higher output current capability (25 mA) and extended temperature range (-40°C to 125°C), while the ISL21080CIH333Z-TK offers superior low-frequency noise performance (30 µVp-p) and significantly lower supply current (1.5 µA). Selection depends on application requirements for current delivery, temperature operation, and power consumption.

Q: Are there input voltage range differences between the original and substitute parts?

A: Yes. The REF3033TB-GT3 accepts input voltage from 2.7V, while both substitutes require minimum 3.35V (Texas Instruments) or 4.6V (Renesas). Applications operating below 3.35V input voltage cannot use the REF3033AIDBZR substitute.

Q: Do the substitute parts meet RoHS compliance requirements?

A: The REF3033AIDBZR is ROHS3 compliant. RoHS status for the ISL21080CIH333Z-TK is not specified in the provided data.

Q: What is the temperature coefficient difference impact?

A: The REF3033TB-GT3 and ISL21080CIH333Z-TK both specify 50 ppm/°C, while the REF3033AIDBZR specifies 75 ppm/°C. For a 100°C temperature swing, this represents a maximum voltage drift of 0.0075V (7.5 mV) for the Texas Instruments part versus 0.005V (5 mV) for the original and Renesas parts.