REF3033AIDBZRG4 Equivalent & Substitute Parts

Part Overview

The REF3033AIDBZRG4 is a series voltage reference IC manufactured by Texas Instruments, delivering a fixed 3.3V output with ±0.2% tolerance in a SOT-23-3 surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The REF3033AIDBZRG4 serves as a precision voltage reference in power management applications requiring stable output voltage with minimal drift across temperature and load conditions.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	25 mA
Tolerance	±0.2%
Temperature Coefficient	75ppm/°C
Input Voltage Range	3.35V ~ 5.5V
Supply Current	50µA
Operating Temperature	-40°C ~ 125°C
Package	SOT-23-3
Noise (0.1Hz to 10Hz)	36µVp-p
Noise (10Hz to 10kHz)	105µVrms

Substitute Part Grouping Explanation

Substitution of the REF3033AIDBZRG4 is determined by the following critical parameters: fixed output voltage of 3.3V, tolerance of ±0.2%, SOT-23-3 package compatibility, and operating temperature range of -40°C to 125°C. Parts meeting these core electrical and mechanical specifications are classified as direct substitutes. Parts with different output current ratings, temperature coefficients, or operating temperature ranges are classified as parametric equivalents, suitable only when application requirements permit relaxed specifications.

Direct Substitutes maintain identical output voltage, tolerance, package, and operating temperature range.

Parametric Equivalents share the 3.3V output and ±0.2% tolerance but differ in output current capability, temperature coefficient, supply current, or operating temperature range.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Tolerance	Temp Coefficient	Input Voltage	Supply Current	Operating Temp	Package	Product Status
REF3033AIDBZRG4	Texas Instruments	3.3V	25 mA	±0.2%	75ppm/°C	3.35V ~ 5.5V	50µA	-40°C ~ 125°C	SOT-23-3	Obsolete
REF3033AIDBZR	Texas Instruments	3.3V	25 mA	±0.2%	75ppm/°C	3.35V ~ 5.5V	50µA	-40°C ~ 125°C	SOT-23-3	Active
REF3033AIDBZT	Texas Instruments	3.3V	25 mA	±0.2%	75ppm/°C	3.35V ~ 5.5V	50µA	-40°C ~ 125°C	SOT-23-3	Active
ISL21010CFH333Z-TK	Renesas Electronics	3.3V	25 mA	±0.2%	50ppm/°C	3.4V ~ 5.5V	100µA	-40°C ~ 125°C	SOT-23-3	Active
ISL21080CIH333Z-TK	Renesas Electronics	3.3V	7 mA	±0.2%	50ppm/°C	4.6V ~ 5.5V	1.5µA	-40°C ~ 85°C	SOT-23-3	Active
LT1460HCS3-3.3#TRMPBF	Analog Devices Inc.	3.3V	40 mA	±0.2%	20ppm/°C	4.2V ~ 20V	220µA	0°C ~ 70°C	SOT-23-3	Active
LT1460HCS3-3.3#TRPBF	Analog Devices Inc.	3.3V	40 mA	±0.2%	20ppm/°C	4.2V ~ 20V	220µA	0°C ~ 70°C	SOT-23-3	Active
LT1460JCS3-3.3#TRMPBF	Analog Devices Inc.	3.3V	40 mA	±0.4%	20ppm/°C	4.2V ~ 20V	220µA	0°C ~ 70°C	SOT-23-3	Active
LT1460JCS3-3.3#TRPBF	Analog Devices Inc.	3.3V	40 mA	±0.4%	20ppm/°C	4.2V ~ 20V	220µA	0°C ~ 70°C	SOT-23-3	Active
LT1460KCS3-3.3#TRMPBF	Analog Devices Inc.	3.3V	40 mA	±0.5%	50ppm/°C	4.2V ~ 20V	220µA	0°C ~ 70°C	SOT-23-3	Active

Engineering Selection Recommendations

Direct Substitutes (Recommended Primary Options)

REF3033AIDBZR and REF3033AIDBZT are direct substitutes for the obsolete REF3033AIDBZRG4. Both parts are manufactured by Texas Instruments, maintain identical electrical specifications including 3.3V output, ±0.2% tolerance, 25 mA output current, and -40°C to 125°C operating temperature range. Both are ROHS3 compliant and carry active product status with established supply availability. REF3033AIDBZR is the manufacturer-recommended replacement with 89,200 units in stock.

Parametric Equivalents (Application-Dependent Selection)

ISL21010CFH333Z-TK (Renesas Electronics) provides 3.3V output with ±0.2% tolerance and maintains the full -40°C to 125°C operating temperature range. This part features improved temperature coefficient (50ppm/°C versus 75ppm/°C) but requires higher supply current (100µA versus 50µA) and slightly higher minimum input voltage (3.4V versus 3.35V). Suitable for applications where lower temperature drift is beneficial and supply current increase is acceptable.

ISL21080CIH333Z-TK (Renesas Electronics) offers 3.3V output with ±0.2% tolerance and superior low-current performance (1.5µA supply current). Operating temperature range is limited to -40°C to 85°C, and output current is reduced to 7 mA. This part is suitable only for low-power applications within the restricted temperature range.

LT1460HCS3-3.3#TRMPBF and LT1460HCS3-3.3#TRPBF (Analog Devices Inc.) deliver 3.3V output with ±0.2% tolerance and superior temperature coefficient (20ppm/°C). Output current is increased to 40 mA. Operating temperature range is restricted to 0°C to 70°C, and minimum input voltage is raised to 4.2V. These parts are suitable for applications requiring higher output current and operating within the narrower temperature and input voltage specifications.

LT1460JCS3-3.3#TRMPBF and LT1460JCS3-3.3#TRPBF (Analog Devices Inc.) provide 3.3V output with relaxed ±0.4% tolerance and 40 mA output current. Temperature coefficient is 20ppm/°C. Operating temperature range is 0°C to 70°C with minimum input voltage of 4.2V. These parts are suitable only when ±0.4% tolerance is acceptable.

LT1460KCS3-3.3#TRMPBF (Analog Devices Inc.) delivers 3.3V output with ±0.5% tolerance and 40 mA output current. This part is suitable only when relaxed tolerance specifications are acceptable.

Frequently Asked Questions (FAQ)

Q: Can REF3033AIDBZR directly replace REF3033AIDBZRG4?

A: Yes. REF3033AIDBZR is the direct substitute. Both parts share identical electrical specifications: 3.3V fixed output, ±0.2% tolerance, 25 mA output current, 75ppm/°C temperature coefficient, and -40°C to 125°C operating temperature range. The primary difference is product status: REF3033AIDBZRG4 is obsolete while REF3033AIDBZR is active with established supply.

Q: What is the difference between REF3033AIDBZR and ISL21010CFH333Z-TK?

A: Both parts deliver 3.3V output with ±0.2% tolerance and support -40°C to 125°C operation. ISL21010CFH333Z-TK features lower temperature coefficient (50ppm/°C versus 75ppm/°C) but requires higher supply current (100µA versus 50µA) and slightly higher minimum input voltage (3.4V versus 3.35V). Selection depends on whether improved temperature stability justifies increased supply current.

Q: Can LT1460HCS3-3.3#TRMPBF replace REF3033AIDBZRG4 in all applications?

A: No. While LT1460HCS3-3.3#TRMPBF maintains 3.3V output with ±0.2% tolerance, it operates only within 0°C to 70°C, restricting use to applications not requiring the full -40°C to 125°C range. Minimum input voltage is also raised to 4.2V. Output current is increased to 40 mA, which may increase power dissipation. Use only when application temperature and input voltage specifications align.

Q: What does tolerance mean in voltage reference selection?

A: Tolerance specifies the maximum deviation of output voltage from the nominal 3.3V value at room temperature. ±0.2% tolerance means output voltage will remain within 3.297V to 3.303V. Tighter tolerance (lower percentage) provides more precise voltage reference. REF3033AIDBZRG4 and most direct substitutes specify ±0.2%, while some alternatives offer ±0.4% or ±0.5%, suitable only when relaxed precision is acceptable.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All parts listed are ROHS3 compliant and carry REACH Unaffected status, meeting environmental and regulatory requirements for industrial and commercial applications.

Q: What is the significance of package type SOT-23-3?

A: SOT-23-3 is a three-pin surface mount package (also designated TO-236-3 or SC-59). All listed parts use this identical package, ensuring mechanical and electrical compatibility on printed circuit boards. Pin configuration and footprint are interchangeable across all substitutes.

Q: How does temperature coefficient affect voltage reference performance?

A: Temperature coefficient (ppm/°C) quantifies output voltage drift per degree Celsius change. Lower values indicate better stability across temperature variations. REF3033AIDBZRG4 specifies 75ppm/°C. ISL21010CFH333Z-TK offers 50ppm/°C, and LT1460 series offers 20ppm/°C. Selection depends on application sensitivity to temperature-induced voltage drift.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message