ZXRE4041ER Equivalent & Substitute Parts

Part Overview

The ZXRE4041ER is a shunt voltage reference IC manufactured by Diodes Incorporated, designed for precision voltage reference applications requiring fixed 1.225V output. This Surface Mount device in SOT-23-3 packaging delivers 12 mA output current with ±2% tolerance and operates across -40°C to 125°C. The product is currently obsolete, making equivalent substitutes necessary for ongoing design support and production requirements. Substitute parts maintain the same output voltage, current rating, and core reference functionality while offering improved tolerance specifications and active product status from alternative manufacturers.

Key Parameters

Parameter	ZXRE4041ER
Manufacturer	Diodes Incorporated
Reference Type	Shunt
Output Voltage (Fixed)	1.225V
Output Current	12 mA
Tolerance	±2%
Temperature Coefficient	100 ppm/°C
Noise (10Hz to 10kHz)	60 µVrms
Cathode Current	30 µA
Operating Temperature Range	-40°C to 125°C
Mounting Type	Surface Mount
Package	SOT-23-3
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the ZXRE4041ER is determined by the following critical parameters that must remain constant or improve:

Output Voltage: Must be 1.225V fixed
Output Current: Must be 12 mA
Reference Type: Must be Shunt
Output Type: Must be Fixed
RoHS & REACH Compliance: Must maintain ROHS3 Compliant and REACH Unaffected status

Substitute parts are grouped by tolerance specification, which represents the primary performance differentiator. All listed substitutes maintain identical output voltage and current specifications. The ZXRE4041ER's ±2% tolerance can be replaced by parts with equal or tighter tolerance (±0.1%, ±0.2%, ±0.5%, or ±1%). Package changes from Surface Mount (SOT-23-3) to Through Hole (TO-92-3) are acceptable substitutions provided circuit board layout accommodates the different form factor. Operating temperature range differences are noted but do not prevent substitution when the application operates within the substitute part's specified range.

Parameter Comparison

Parameter	ZXRE4041ER	LM4041AIZ-1.2/NOPB	LM4041BIZ-1.2/NOPB	LM4041C12ILP	LM4041CIZ-1.2/NOPB	LM4041D12ILP	LM4041D12ILPE3	LM4041DIZ-1.2/NOPB
Manufacturer	Diodes Inc.	Texas Instruments	National Semiconductor	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Output Voltage	1.225V	1.225V	1.225V	1.225V	1.225V	1.225V	1.225V	1.225V
Output Current	12 mA	12 mA	12 mA	12 mA	12 mA	12 mA	12 mA	12 mA
Tolerance	±2%	±0.1%	±0.2%	±0.5%	±0.5%	±1%	±1%	±1%
Temperature Coefficient	100 ppm/°C	100 ppm/°C	100 ppm/°C	100 ppm/°C	100 ppm/°C	150 ppm/°C	150 ppm/°C	150 ppm/°C
Noise (10Hz to 10kHz)	60 µVrms	20 µVrms	20 µVrms	20 µVrms	20 µVrms	20 µVrms	20 µVrms	20 µVrms
Cathode Current	30 µA	65 µA	65 µA	80 µA	65 µA	80 µA	80 µA	70 µA
Operating Temperature	-40°C to 125°C	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C
Mounting Type	Surface Mount	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package	SOT-23-3	TO-92-3	TO-92-3	TO-92-3	TO-92-3	TO-92-3	TO-92-3	TO-92-3
Product Status	Obsolete	Active	Active	Active	Active	Active	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: LM4041AIZ-1.2/NOPB

This Texas Instruments part offers the tightest tolerance specification (±0.1%) with active product status and full ROHS3 compliance. It provides superior performance margin over the obsolete ZXRE4041ER. The trade-off is package conversion from Surface Mount to Through Hole (TO-92-3), requiring circuit board redesign. Cathode current is higher at 65 µA versus 30 µA, and operating temperature maximum is reduced to 85°C. This part is suitable for applications where tolerance precision is critical and board layout can accommodate through-hole mounting.

Secondary Recommendation: LM4041BIZ-1.2/NOPB

National Semiconductor's LM4041BIZ-1.2/NOPB provides ±0.2% tolerance with active product status and ROHS3 compliance. This represents a balanced alternative with improved tolerance over the original part while maintaining reasonable performance specifications. Cathode current is 65 µA and operating temperature range is -40°C to 85°C. Package is TO-92-3 (Through Hole).

Tertiary Recommendation: LM4041DIZ-1.2/NOPB

Texas Instruments LM4041DIZ-1.2/NOPB offers ±1% tolerance with active product status and ROHS3 compliance. This part most closely matches the original tolerance specification while providing modern active product support. Cathode current is 70 µA and operating temperature range is -40°C to 85°C. Package is TO-92-3 (Through Hole).

Alternative for Tight Tolerance Requirements: LM4041CIZ-1.2/NOPB

Texas Instruments LM4041CIZ-1.2/NOPB provides ±0.5% tolerance with active product status. This part bridges the gap between the ±2% original specification and the tightest tolerance options. Cathode current is 65 µA and operating temperature range is -40°C to 85°C. Package is TO-92-3 (Through Hole).

Avoid: LM4041D12ILPE3

This part carries obsolete product status, making it unsuitable for new designs despite meeting electrical specifications. Use active alternatives instead.

Frequently Asked Questions (FAQ)

Q: Can I use a Through Hole package (TO-92-3) substitute on a board designed for Surface Mount (SOT-23-3)?

A: No. Through Hole and Surface Mount packages require different PCB footprints and assembly processes. Circuit board redesign is necessary to accommodate TO-92-3 packages. Alternatively, use an adapter or breakout board if the original design cannot be modified.

Q: What is the significance of tolerance differences between ±2%, ±1%, ±0.5%, ±0.2%, and ±0.1%?

A: Tolerance specifies the maximum deviation of the output voltage from the nominal 1.225V value. The ZXRE4041ER allows ±2.45mV deviation. LM4041AIZ-1.2/NOPB allows only ±0.1225mV deviation. Tighter tolerance provides more stable reference voltage for precision analog circuits. Select tolerance based on application requirements.

Q: Why do substitute parts have higher cathode current specifications?

A: Cathode current represents the minimum current required to maintain regulation. Substitute parts generally require 65-80 µA versus the original 30 µA. Circuit designs must ensure adequate bias current supply to the reference IC. Review application schematics to confirm bias current availability.

Q: Is the reduced operating temperature range (-40°C to 85°C vs. -40°C to 125°C) a problem?

A: This depends on application requirements. If the circuit operates only within -40°C to 85°C, substitute parts are fully compatible. If the application requires operation above 85°C, substitute parts are not suitable. Verify actual operating temperature requirements before selection.

Q: What is the impact of noise specification differences (60 µVrms vs. 20 µVrms)?

A: Lower noise indicates cleaner reference voltage output. Substitute parts provide 3x lower noise, which improves performance in sensitive analog applications. This is a performance improvement, not a compatibility issue.

Q: Are all substitute parts RoHS and REACH compliant?

A: Yes. All listed substitute parts maintain ROHS3 Compliant and REACH Unaffected status, matching the original ZXRE4041ER compliance profile.

Q: Can I mix different substitute parts in the same design?

A: Yes, provided all parts meet the application's tolerance, temperature, and current requirements. However, using identical parts throughout a production run ensures consistent performance and simplifies inventory management.

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