ZXRE4041DFTC Equivalent & Substitute Parts

Part Overview

The ZXRE4041DFTC is a shunt voltage reference IC manufactured by Diodes Incorporated, designed to provide a fixed 1.225V output with ±1% 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 production continuity. The part operates across -40°C to 125°C and delivers 12 mA output current, suitable for precision voltage reference applications in power management circuits.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Fixed
Voltage - Output (Min/Fixed)	1.225V
Current - Output	12 mA
Tolerance	±1%
Temperature Coefficient	100ppm/°C
Noise - 10Hz to 10kHz	60µVrms
Current - Cathode	30 µA
Operating Temperature	-40°C ~ 125°C (TA)
Package / Case	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the ZXRE4041DFTC is determined by strict adherence to the following electrical and mechanical parameters:

Critical Parameters for Substitution:

Reference Type: Shunt
Output Type: Fixed
Voltage - Output: 1.225V
Package / Case: TO-236-3, SC-59, SOT-23-3
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Allowable Variations:

Tolerance: ±1% or better (±0.1%, ±0.2% acceptable)
Current - Output: 12 mA or higher
Operating Temperature: Must include -40°C to 125°C range or subset thereof
Noise - 10Hz to 10kHz: 60µVrms or lower
Current - Cathode: 30 µA or higher

Substitute parts are grouped into two categories: parametric equivalents (identical specifications) and manufacturer-recommended alternatives (enhanced performance characteristics with compatible electrical and mechanical interfaces).

Parameter Comparison

Part Number	Manufacturer	Voltage Output	Current Output	Tolerance	Temp Coeff	Noise 10Hz-10kHz	Cathode Current	Temp Range	Package	Status
ZXRE4041DFTC	Diodes Inc.	1.225V	12 mA	±1%	100ppm/°C	60µVrms	30 µA	-40 to 125°C	SOT-23-3	Obsolete
ZXRE4041DFTA	Diodes Inc.	1.225V	12 mA	±1%	100ppm/°C	60µVrms	30 µA	-40 to 125°C	SOT-23-3	Active
LM4041A12IDBZR	Texas Instruments	1.225V	12 mA	±0.1%	100ppm/°C	20µVrms	80 µA	-40 to 85°C	SOT-23-3	Active
LM4041A12IDBZT	Texas Instruments	1.225V	12 mA	±0.1%	100ppm/°C	20µVrms	80 µA	-40 to 85°C	SOT-23-3	Active
LM4041AEM3-1.2+T	Analog Devices/Maxim	1.225V	12 mA	±0.1%	100ppm/°C	20µVrms	60 µA	-40 to 125°C	SOT-23-3	Active
LM4041AIM3-1.2+T	Analog Devices/Maxim	1.225V	20 mA	±0.1%	100ppm/°C	20µVrms	60 µA	-40 to 85°C	SOT-23-3	Active
LM4041AIM3-1.2/NOPB	Texas Instruments	1.225V	12 mA	±0.1%	100ppm/°C	20µVrms	65 µA	-40 to 85°C	SOT-23-3	Active
LM4041AIM3X-1.2/NOPB	Texas Instruments	1.225V	12 mA	±0.1%	100ppm/°C	20µVrms	65 µA	-40 to 85°C	SOT-23-3	Active
LM4041B12IDBZR	Texas Instruments	1.225V	12 mA	±0.2%	100ppm/°C	20µVrms	80 µA	-40 to 85°C	SOT-23-3	Active
LM4041B12IDBZT	Texas Instruments	1.225V	12 mA	±0.2%	100ppm/°C	20µVrms	80 µA	-40 to 85°C	SOT-23-3	Active
LM4041BEM3-1.2+T	Analog Devices/Maxim	1.225V	N/A	N/A	N/A	N/A	N/A	N/A	SOT-23-3	Active

Engineering Selection Recommendations

Parametric Equivalent (Direct Replacement): ZXRE4041DFTA is the direct parametric equivalent to ZXRE4041DFTC. Both parts share identical electrical specifications (1.225V, ±1% tolerance, 12 mA output, 100ppm/°C temperature coefficient, 60µVrms noise). ZXRE4041DFTA is active and available in higher inventory quantities, making it the preferred choice for obsolescence mitigation.

Enhanced Performance Alternatives: Texas Instruments LM4041A12IDBZR, LM4041A12IDBZT, and LM4041AIM3-1.2/NOPB offer improved tolerance (±0.1%) and reduced noise (20µVrms) compared to the original specification. These parts are suitable for applications requiring tighter voltage accuracy. Operating temperature range is -40°C to 85°C, which covers standard industrial applications but does not extend to the full 125°C upper limit of the original part.

Analog Devices LM4041AEM3-1.2+T provides ±0.1% tolerance with extended operating temperature range (-40°C to 125°C), matching the original part's thermal envelope while delivering superior voltage accuracy and lower noise performance.

Compliance Considerations: All substitute parts maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can I use LM4041A12IDBZR as a direct replacement for ZXRE4041DFTC? A: Electrically, yes. The LM4041A12IDBZR maintains the same 1.225V output, 12 mA current, and SOT-23-3 package. However, it operates only to 85°C maximum, whereas the original part extends to 125°C. Verify your application's temperature requirements before substitution.

Q: What is the difference between ZXRE4041DFTA and ZXRE4041DFTC? A: Both parts are parametrically identical. The primary difference is product status: ZXRE4041DFTC is obsolete while ZXRE4041DFTA is active. ZXRE4041DFTA is available in higher quantities and is the recommended replacement for the obsolete variant.

Q: Why do some substitute parts have lower noise specifications? A: Improved manufacturing processes and tighter tolerance grades (±0.1% vs. ±1%) inherently produce lower noise performance. Parts like LM4041A12IDBZR achieve 20µVrms noise compared to the original 60µVrms, providing superior signal integrity in precision applications.

Q: Are all substitute parts available in the same packaging options? A: All listed substitutes use SOT-23-3 surface mount packaging. Packaging variants (Cut Tape, Tape & Reel) differ by part number suffix but do not affect electrical compatibility. Verify your procurement requirements for tape format and reel specifications.

Q: Can I use LM4041AIM3-1.2+T if my circuit requires operation above 85°C? A: No. LM4041AIM3-1.2+T is rated to 85°C maximum. For applications requiring 125°C operation, use LM4041AEM3-1.2+T, which maintains the extended temperature range while providing ±0.1% tolerance.

Q: What does the tolerance rating mean for my circuit design? A: Tolerance specifies the maximum deviation of the output voltage from the nominal 1.225V value. ±1% tolerance allows ±12.25mV deviation; ±0.1% tolerance allows ±1.225mV deviation. Tighter tolerance parts reduce voltage regulation errors in precision reference applications.

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