ZXRE4041EFTC Shunt Voltage Reference IC – Equivalent & Substitute Parts

Part Overview

The ZXRE4041EFTC is a fixed shunt voltage reference IC manufactured by Diodes Incorporated, designed for precision voltage regulation applications. This device generates a fixed 1.225V output with ±2% tolerance and operates across the industrial temperature range of -40°C to 125°C. The part is classified as obsolete, making equivalent and substitute components necessary for ongoing design support and production continuity. Substitute parts maintain the same output voltage, package form factor (SOT-23-3), and core functionality while offering improved specifications or active product status.

Key Parameters

Parameter	ZXRE4041EFTC
Reference Type	Shunt
Output Type	Fixed
Voltage - Output (Min/Fixed)	1.225V
Current - Output	12 mA
Tolerance	±2%
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
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the ZXRE4041EFTC is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Output voltage: 1.225V (fixed)
Package type: SOT-23-3 (TO-236-3, SC-59)
Reference type: Shunt
Output type: Fixed
Mounting type: Surface Mount
RoHS compliance: ROHS3 Compliant
MSL rating: 1 (Unlimited)

Allowable Variations:

Tolerance: ±2% or better (±0.1%, ±0.2% acceptable)
Current - Output: 12 mA or higher (20 mA acceptable)
Current - Cathode: 30 µA or higher
Operating temperature: -40°C to 85°C minimum (extended to 125°C acceptable)
Noise specification: 60µVrms or lower
Product status: Active preferred for obsolete parts

All substitute parts listed maintain identical output voltage, package configuration, and core shunt reference functionality. Improvements in tolerance, noise performance, and product status are permitted within the substitution framework.

Parameter Comparison

Part Number	Manufacturer	Voltage Output	Current Output	Tolerance	Noise (10Hz-10kHz)	Cathode Current	Temp Range	Product Status
ZXRE4041EFTC	Diodes Incorporated	1.225V	12 mA	±2%	60µVrms	30 µA	-40°C ~ 125°C	Obsolete
LM4041A12IDBZR	Texas Instruments	1.225V	12 mA	±0.1%	20µVrms	80 µA	-40°C ~ 85°C	Active
LM4041A12IDBZT	Texas Instruments	1.225V	12 mA	±0.1%	20µVrms	80 µA	-40°C ~ 85°C	Active
LM4041AEM3-1.2+T	Analog Devices Inc./Maxim Integrated	1.225V	12 mA	±0.1%	20µVrms	60 µA	-40°C ~ 125°C	Active
LM4041AIM3-1.2+T	Analog Devices Inc./Maxim Integrated	1.225V	20 mA	±0.1%	20µVrms	60 µA	-40°C ~ 85°C	Active
LM4041AIM3-1.2/NOPB	Texas Instruments	1.225V	12 mA	±0.1%	20µVrms	65 µA	-40°C ~ 85°C	Active
LM4041AIM3X-1.2/NOPB	Texas Instruments	1.225V	12 mA	±0.1%	20µVrms	65 µA	-40°C ~ 85°C	Active
LM4041B12IDBZR	Texas Instruments	1.225V	12 mA	±0.2%	20µVrms	80 µA	-40°C ~ 85°C	Active
LM4041B12IDBZT	Texas Instruments	1.225V	12 mA	±0.2%	20µVrms	80 µA	-40°C ~ 85°C	Active
LM4041BEM3-1.2+T	Analog Devices Inc./Maxim Integrated	1.225V	12 mA	±0.2%	20µVrms	60 µA	-40°C ~ 125°C	Active
LM4041BIM3-1.2+T	Analog Devices Inc./Maxim Integrated	1.225V	20 mA	±0.2%	20µVrms	60 µA	-40°C ~ 85°C	Active

Engineering Selection Recommendations

Primary Recommendation for Extended Temperature Range: LM4041AEM3-1.2+T and LM4041BEM3-1.2+T maintain the full -40°C to 125°C operating range of the original ZXRE4041EFTC while offering improved tolerance specifications (±0.1% and ±0.2% respectively) and reduced noise performance. Both parts are manufactured by Analog Devices Inc./Maxim Integrated and carry active product status with full ROHS3 compliance and MSL 1 rating.

Primary Recommendation for Standard Temperature Range: LM4041A12IDBZR and LM4041A12IDBZT (Texas Instruments) provide the tightest tolerance specification (±0.1%) with significantly reduced noise (20µVrms versus 60µVrms) and active product status. These parts operate across -40°C to 85°C and are suitable for applications not requiring extended high-temperature operation.

Alternative with Relaxed Tolerance: LM4041B12IDBZR and LM4041B12IDBZT offer ±0.2% tolerance with identical noise and current specifications to the LM4041A series, providing cost optimization while maintaining superior performance relative to the obsolete ZXRE4041EFTC.

All recommended substitutes maintain ROHS3 compliance, MSL 1 rating, and SOT-23-3 package compatibility. Selection should prioritize active product status and compliance certifications for long-term supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can LM4041A and LM4041B series parts directly replace the ZXRE4041EFTC? A: Yes. All listed substitute parts maintain identical 1.225V fixed output voltage, 12 mA output current (or higher), SOT-23-3 package configuration, and shunt reference topology. Electrical and mechanical compatibility is confirmed across all parameters.

Q: What is the significance of tolerance differences (±2%, ±0.1%, ±0.2%)? A: Tolerance defines the maximum deviation of output voltage from the nominal 1.225V specification. The ZXRE4041EFTC permits ±2% deviation (1.2025V to 1.2475V). Substitute parts with ±0.1% or ±0.2% tolerance provide tighter voltage regulation, reducing circuit design margins and improving overall system accuracy. Selection depends on application precision requirements.

Q: Why do some substitutes specify higher cathode current (80 µA versus 30 µA)? A: Cathode current represents the minimum operating current required to maintain regulation. Higher cathode current specifications indicate the device requires more bias current for stable operation. This parameter must be verified against circuit design to ensure adequate current sourcing capability.

Q: What is the difference between Cut Tape (CT) & Digi-Reel® and Tape & Reel (TR) packaging? A: Both are surface-mount tape formats suitable for automated assembly. Cut Tape & Digi-Reel® is supplied in smaller quantities on cut tape reels, while Tape & Reel (TR) is supplied in full production reels. Package selection depends on production volume and inventory management requirements. Electrical and mechanical specifications remain identical.

Q: Are LM4041AEM3-1.2+T and LM4041BEM3-1.2+T suitable for applications requiring -40°C to 125°C operation? A: Yes. Both parts explicitly specify -40°C to 125°C operating temperature range, matching the original ZXRE4041EFTC specification. These are the only substitute options that maintain full extended temperature range capability.

Q: Do all substitute parts comply with RoHS and REACH regulations? A: Yes. All listed substitute parts carry ROHS3 Compliant status and REACH Unaffected designation, matching the compliance profile of the original ZXRE4041EFTC.

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