REF3140AIDBZRG4 Equivalent & Substitute Parts

Part Overview

The REF3140AIDBZRG4 is a series voltage reference IC manufactured by Texas Instruments, delivering a fixed 4.096V output with ±0.2% tolerance in a SOT-23-3 surface mount package. This precision voltage reference is designed for applications requiring stable reference voltages with low noise characteristics. The part is currently listed as obsolete, making identification of equivalent and substitute components essential for design continuity and procurement planning.

Key Parameters

Parameter	Value
Manufacturer Part Number	REF3140AIDBZRG4
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Voltage (Fixed)	4.096V
Output Current	10 mA
Tolerance	±0.2%
Temperature Coefficient	20ppm/°C
Noise (0.1Hz to 10Hz)	53µVp-p
Noise (10Hz to 10kHz)	78µVrms
Input Voltage Range	4.146V ~ 5.5V
Supply Current	135µA
Operating Temperature	-40°C ~ 125°C
Package / Case	TO-236-3, SC-59, SOT-23-3
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the REF3140AIDBZRG4 is determined by the following critical parameters:

Primary Substitution Criteria:

Fixed output voltage of 4.096V
Output current capability of 10 mA or greater
Tolerance of ±0.2% or better
Temperature coefficient of 20ppm/°C or lower
SOT-23-3 package compatibility
Operating temperature range covering -40°C to 125°C

Substitution Categories:

Parametric Equivalents maintain identical electrical specifications and differ only in packaging format or product status. These parts are direct replacements with no design modifications required.

Manufacturer Recommended Alternatives provide the same 4.096V output and ±0.2% tolerance but may have different output current capabilities, input voltage ranges, or operating temperature limits. These require design verification for specific application parameters.

Cross-Manufacturer Alternatives from Analog Devices Inc./Maxim Integrated and Xicor offer equivalent functionality with variations in noise performance, supply current, or tolerance specifications.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Tolerance	Temp Coeff	Input Voltage	Supply Current	Operating Temp	Product Status	Packaging
REF3140AIDBZRG4	Texas Instruments	4.096V	10 mA	±0.2%	20ppm/°C	4.146V ~ 5.5V	135µA	-40°C ~ 125°C	Obsolete	SOT-23-3
REF3140AIDBZR	Texas Instruments	4.096V	10 mA	±0.2%	20ppm/°C	4.146V ~ 5.5V	135µA	-40°C ~ 125°C	Active	SOT-23-3
REF3140AIDBZT	Texas Instruments	4.096V	10 mA	±0.2%	20ppm/°C	4.146V ~ 5.5V	135µA	-40°C ~ 125°C	Active	SOT-23-3
REF3140AQDBZRQ1	Texas Instruments	4.096V	10 mA	±0.2%	20ppm/°C	4.146V ~ 5.5V	135µA	-40°C ~ 125°C	Active	SOT-23-3
MAX6041AEUR+T	Analog Devices Inc./Maxim Integrated	4.096V	500 µA	±0.2%	20ppm/°C	4.296V ~ 12.6V	35µA	-40°C ~ 85°C	Active	SOT-23-3
MAX6064AEUR+T	Analog Devices Inc./Maxim Integrated	4.096V	5 mA	±0.2%	20ppm/°C	4.296V ~ 12.6V	125µA	-40°C ~ 85°C	Active	SOT-23-3
MAX6064BEUR+T	Analog Devices Inc./Maxim Integrated	4.096V	5 mA	±0.4%	30ppm/°C	4.296V ~ 12.6V	125µA	-40°C ~ 85°C	Active	SOT-23-3
X60003CIG3Z-41T1	Xicor-Division of Intersil	4.096V	10 mA	±0.06%	20ppm/°C	4.5V ~ 9V	900nA	-40°C ~ 85°C	Active	SOT-23-3

Engineering Selection Recommendations

Direct Replacement (Parametric Equivalents):

REF3140AIDBZR and REF3140AIDBZT are parametric equivalents of the obsolete REF3140AIDBZRG4. Both maintain identical electrical specifications and operating parameters. REF3140AIDBZR is available in Cut Tape and Digi-Reel packaging with 20,300 units in stock. REF3140AIDBZT is available in Cut Tape and Digi-Reel packaging with 6,070 units in stock. Both parts are active products with ROHS3 compliance and unlimited moisture sensitivity rating.

REF3140AQDBZRQ1 is an automotive-qualified variant (AEC-Q100) with identical electrical specifications. This part is suitable for applications requiring automotive-grade components and carries a 2-year moisture sensitivity rating. Inventory availability is 3,202 units.

Alternative Selections with Design Considerations:

MAX6041AEUR+T provides ±0.2% tolerance and 20ppm/°C temperature coefficient matching the original specification. However, output current is limited to 500µA compared to the 10mA requirement, and operating temperature range is restricted to -40°C to 85°C. This part is suitable only for applications with lower current demands and reduced temperature range requirements.

MAX6064AEUR+T delivers ±0.2% tolerance and 20ppm/°C temperature coefficient with 5mA output current. Operating temperature range is -40°C to 85°C. This part requires verification that 5mA output current is sufficient for the application.

MAX6064BEUR+T has ±0.4% tolerance and 30ppm/°C temperature coefficient, representing degraded performance compared to the original specification. This part is not recommended for applications requiring ±0.2% tolerance.

X60003CIG3Z-41T1 offers superior tolerance of ±0.06% and exceptionally low supply current of 900nA. However, input voltage range is restricted to 4.5V to 9V, and operating temperature range is limited to -40°C to 85°C. This part is suitable for applications where the narrower input voltage and temperature ranges are acceptable and where superior tolerance is beneficial.

Frequently Asked Questions (FAQ)

Q: Can REF3140AIDBZR be used as a direct replacement for REF3140AIDBZRG4?

A: Yes. REF3140AIDBZR is a parametric equivalent with identical electrical specifications. The primary difference is product status (active versus obsolete) and packaging format. No design modifications are required.

Q: What is the difference between REF3140AIDBZR and REF3140AIDBZT?

A: Both parts are parametric equivalents with identical electrical specifications. The difference lies in packaging format and inventory availability. REF3140AIDBZR is available in Cut Tape and Digi-Reel format with higher stock levels. REF3140AIDBZT is also available in Cut Tape and Digi-Reel format with lower stock levels.

Q: Is REF3140AQDBZRQ1 suitable for automotive applications?

A: REF3140AQDBZRQ1 carries AEC-Q100 automotive qualification and is designed for automotive-grade applications. It maintains identical electrical specifications to the original part and carries a 2-year moisture sensitivity rating compared to unlimited for standard variants.

Q: Why do MAX6064 parts have lower output current than the original specification?

A: MAX6064AEUR+T and MAX6064BEUR+T are designed for applications requiring lower output current (5mA). These parts are suitable only if the application current requirement does not exceed 5mA. Verify application requirements before selection.

Q: What are the key differences between MAX6064AEUR+T and MAX6064BEUR+T?

A: MAX6064AEUR+T maintains ±0.2% tolerance and 20ppm/°C temperature coefficient. MAX6064BEUR+T has degraded specifications with ±0.4% tolerance and 30ppm/°C temperature coefficient. MAX6064AEUR+T is the preferred choice for applications requiring ±0.2% tolerance.

Q: Can X60003CIG3Z-41T1 replace the REF3140AIDBZRG4 in all applications?

A: X60003CIG3Z-41T1 offers superior tolerance (±0.06%) and lower supply current (900nA). However, input voltage range is restricted to 4.5V to 9V compared to 4.146V to 5.5V for the original part, and operating temperature range is limited to -40°C to 85°C. Verify that these parameter restrictions are acceptable for the specific application before selection.

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

A: All substitute parts listed maintain SOT-23-3 package compatibility, ensuring mechanical and electrical pin compatibility. No PCB layout modifications are required for direct substitution.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed are ROHS3 compliant, meeting environmental and regulatory requirements equivalent to the original part.

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