REF3140AIDBZTG4 Equivalent & Substitute Parts

Part Overview

The REF3140AIDBZTG4 is a series voltage reference IC from Texas Instruments, delivering a fixed 4.096V output with ±0.2% tolerance in a SOT-23-3 surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The part operates across -40°C to 125°C and supplies up to 10 mA output current with low noise characteristics suitable for precision analog applications.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Voltage (Fixed)	4.096V
Output Current	10 mA
Tolerance	±0.2%
Temperature Coefficient	20ppm/°C
Input Voltage Range	4.146V ~ 5.5V
Supply Current	135µA
Operating Temperature	-40°C ~ 125°C
Package	SOT-23-3 (TO-236-3, SC-59)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the REF3140AIDBZTG4 is determined by the following critical parameters: fixed output voltage of 4.096V, output current capability, voltage tolerance, temperature coefficient, input voltage range, operating temperature range, and SOT-23-3 package compatibility. Substitute parts are grouped into three categories based on their relationship to the main part specifications:

Parametric Equivalents (Texas Instruments REF3140 Series): Parts REF3140AIDBZR, REF3140AIDBZT, and REF3140AQDBZRQ1 maintain identical electrical specifications to the main part, differing only in packaging format (Cut Tape, Digi-Reel, or Tape & Reel) and product status (Active vs. Obsolete). These are direct functional replacements.

Manufacturer Recommended Alternatives (Analog Devices/Maxim): MAX6041AEUR+T, MAX6064AEUR+T, and MAX6064BEUR+T provide 4.096V fixed output in SOT-23-3 packages but with variations in output current (500µA to 5mA), input voltage range (4.296V ~ 12.6V), and operating temperature (limited to -40°C ~ 85°C). These are suitable where output current requirements are lower and extended temperature operation above 85°C is not required.

Manufacturer Recommended Alternatives (Microchip & Xicor): MCP1541T-I/TT and X60003CIG3Z-41T1 deliver 4.096V output in SOT-23-3 packages with trade-offs in tolerance (±1% vs. ±0.2%), output current capability, and input voltage specifications. X60003CIG3Z-41T1 offers superior tolerance (±0.06%) and lower supply current (900nA) but operates within a narrower input voltage window (4.5V ~ 9V).

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Tolerance	Temp Coeff	Input Voltage	Supply Current	Op Temp Range	Product Status	Package
REF3140AIDBZTG4	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/Maxim	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/Maxim	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/Maxim	4.096V	5 mA	±0.4%	30ppm/°C	4.296V ~ 12.6V	125µA	-40°C ~ 85°C	Active	SOT-23-3
MCP1541T-I/TT	Microchip Technology	4.096V	2 mA	±1%	50ppm/°C	4.3V ~ 5.5V	120µA	-40°C ~ 85°C	Active	SOT-23-3
X60003CIG3Z-41T1	Xicor/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 (Recommended for Obsolete Part Transition): REF3140AIDBZR, REF3140AIDBZT, and REF3140AQDBZRQ1 are active Texas Instruments parts with identical electrical and thermal specifications. REF3140AQDBZRQ1 includes AEC-Q100 automotive qualification and is suitable for applications requiring automotive-grade reliability. All three maintain the full -40°C to 125°C operating range and 10 mA output current of the original part.

Alternative for Standard Industrial Applications: MAX6064AEUR+T maintains ±0.2% tolerance and 20ppm/°C temperature coefficient but limits output current to 5 mA and operating temperature to -40°C ~ 85°C. This part is suitable for applications not requiring the full 10 mA output or extended high-temperature operation. MAX6064BEUR+T offers the same current and temperature range but with relaxed tolerance (±0.4%) and higher temperature coefficient (30ppm/°C).

Alternative for Low-Power Applications: MAX6041AEUR+T provides the lowest supply current (35µA) and highest input voltage range (4.296V ~ 12.6V) but limits output current to 500µA. This part is appropriate for battery-powered or low-power reference applications where output current demand is minimal.

Alternative for Precision Applications: X60003CIG3Z-41T1 delivers superior tolerance (±0.06%) and extremely low supply current (900nA) while maintaining 10 mA output capability. However, the narrower input voltage range (4.5V ~ 9V) and -40°C ~ 85°C operating limit must be verified against system requirements.

Not Recommended for Direct Substitution: MCP1541T-I/TT exhibits relaxed tolerance (±1%) and higher temperature coefficient (50ppm/°C), making it unsuitable for precision reference applications requiring ±0.2% accuracy.

Frequently Asked Questions (FAQ)

Q: Can REF3140AIDBZR, REF3140AIDBZT, or REF3140AQDBZRQ1 be used as direct replacements for the obsolete REF3140AIDBZTG4?

A: Yes. All three parts are parametric equivalents with identical output voltage (4.096V), tolerance (±0.2%), temperature coefficient (20ppm/°C), output current (10 mA), and operating temperature range (-40°C ~ 125°C). Differences are limited to packaging format and product status. REF3140AQDBZRQ1 includes automotive qualification (AEC-Q100) if required.

Q: What is the key difference between the Texas Instruments REF3140 series and the Analog Devices MAX6064 series?

A: The primary differences are output current capability (10 mA vs. 5 mA), input voltage range (4.146V ~ 5.5V vs. 4.296V ~ 12.6V), and maximum operating temperature (125°C vs. 85°C). MAX6064 parts are suitable for applications with lower output current requirements and narrower supply voltage specifications.

Q: Can MAX6041AEUR+T replace REF3140AIDBZTG4 in all applications?

A: No. MAX6041AEUR+T limits output current to 500µA compared to the original part's 10 mA capability. It is suitable only for applications where output current demand does not exceed 500µA. Additionally, the maximum operating temperature is limited to 85°C.

Q: Is X60003CIG3Z-41T1 a better choice than REF3140AIDBZR due to its superior tolerance (±0.06%)?

A: X60003CIG3Z-41T1 offers tighter tolerance but operates within a narrower input voltage range (4.5V ~ 9V) and maximum temperature of 85°C. Selection depends on whether the application requires the extended temperature range and input voltage flexibility of the original part. Verify input supply voltage compatibility before substitution.

Q: What packaging options are available for the REF3140 series?

A: REF3140AIDBZR is supplied in Cut Tape (CT) & Digi-Reel format. REF3140AIDBZT is supplied in Cut Tape (CT) & Digi-Reel format. REF3140AQDBZRQ1 is supplied in Tape & Reel (TR) format. All maintain the SOT-23-3 package specification.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant. REF3140AQDBZRQ1 has MSL rating of 2 (1 Year); all other parts have MSL rating of 1 (Unlimited).

Q: Which substitute part has the lowest supply current?

A: X60003CIG3Z-41T1 has the lowest supply current at 900nA, compared to 135µA for the original REF3140AIDBZTG4. This makes it suitable for ultra-low-power applications, provided the input voltage range (4.5V ~ 9V) and operating temperature limit (85°C) are compatible with system requirements.

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