ZXRE4041CFTC Equivalent & Substitute Parts

Part Overview

The ZXRE4041CFTC is a shunt voltage reference IC manufactured by Diodes Incorporated, providing a fixed 1.225V output with ±0.5% tolerance in a SOT-23-3 surface mount package. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design requirements and production continuity. The part operates across -40°C to 125°C and delivers 12 mA output current with 100 ppm/°C temperature coefficient.

Key Parameters

Parameter	Value
Manufacturer Part Number	ZXRE4041CFTC
Manufacturer	Diodes Incorporated
Reference Type	Shunt
Output Voltage (Fixed)	1.225V
Output Current	12 mA
Tolerance	±0.5%
Temperature Coefficient	100 ppm/°C
Noise (10Hz to 10kHz)	60 µVrms
Cathode Current	30 µA
Operating Temperature Range	-40°C to 125°C
Package / Case	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the ZXRE4041CFTC is determined by the following critical parameters:

Primary Substitution Criteria:

Reference Type: Shunt (fixed requirement)
Output Voltage: 1.225V (fixed requirement)
Package / Case: TO-236-3, SC-59, SOT-23-3 (mechanical compatibility)
Mounting Type: Surface Mount (assembly compatibility)
Output Current: 12 mA (functional requirement)
Temperature Coefficient: 100 ppm/°C (performance specification)

Secondary Compatibility Parameters:

Tolerance: ±0.5% or better (±0.1%, ±0.2% are acceptable improvements)
Operating Temperature Range: -40°C to 125°C or equivalent
Noise Performance: 60 µVrms or better
RoHS3 Compliance: Required for regulatory alignment

Substitute parts are grouped into two categories: parametric equivalents (identical specifications) and manufacturer-recommended alternatives (improved tolerance or performance characteristics while maintaining core functionality).

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Tolerance	Temp Coeff	Noise (10Hz-10kHz)	Cathode Current	Temp Range	Package	Status
ZXRE4041CFTC	Diodes Inc.	1.225V	12 mA	±0.5%	100 ppm/°C	60 µVrms	30 µA	-40 to 125°C	SOT-23-3	Obsolete
ZXRE4041CFTA	Diodes Inc.	1.225V	12 mA	±0.5%	100 ppm/°C	60 µVrms	30 µA	-40 to 125°C	SOT-23-3	Active
LM4041A12IDBZR	Texas Instruments	1.225V	12 mA	±0.1%	100 ppm/°C	20 µVrms	80 µA	-40 to 85°C	SOT-23-3	Active
LM4041A12IDBZT	Texas Instruments	1.225V	12 mA	±0.1%	100 ppm/°C	20 µVrms	80 µA	-40 to 85°C	SOT-23-3	Active
LM4041AEM3-1.2+T	Analog Devices Inc./Maxim	1.225V	12 mA	±0.1%	100 ppm/°C	20 µVrms	60 µA	-40 to 125°C	SOT-23-3	Active
LM4041AIM3-1.2+T	Analog Devices Inc./Maxim	1.225V	20 mA	±0.1%	100 ppm/°C	20 µVrms	60 µA	-40 to 85°C	SOT-23-3	Active
LM4041AIM3-1.2/NOPB	Texas Instruments	1.225V	12 mA	±0.1%	100 ppm/°C	20 µVrms	65 µA	-40 to 85°C	SOT-23-3	Active
LM4041AIM3X-1.2/NOPB	Texas Instruments	1.225V	12 mA	±0.1%	100 ppm/°C	20 µVrms	65 µA	-40 to 85°C	SOT-23-3	Active
LM4041B12IDBZR	Texas Instruments	1.225V	12 mA	±0.2%	100 ppm/°C	20 µVrms	80 µA	-40 to 85°C	SOT-23-3	Active
LM4041B12IDBZT	Texas Instruments	1.225V	12 mA	±0.2%	100 ppm/°C	20 µVrms	80 µA	-40 to 85°C	SOT-23-3	Active
LM4041BEM3-1.2+T	Analog Devices Inc./Maxim	1.225V	N/A	N/A	N/A	N/A	N/A	-40 to 125°C	SOT-23-3	Active

Engineering Selection Recommendations

Direct Parametric Equivalent: ZXRE4041CFTA is the primary replacement for ZXRE4041CFTC. Both parts are manufactured by Diodes Incorporated with identical electrical specifications (1.225V, ±0.5%, 12 mA, 100 ppm/°C). The key difference is product status: ZXRE4041CFTA is active with 496,708 units in stock, ensuring long-term availability. This part maintains full compatibility with existing designs without performance trade-offs.

Improved Tolerance Alternatives: Texas Instruments LM4041A12IDBZR, LM4041A12IDBZT, and LM4041AIM3-1.2/NOPB offer ±0.1% tolerance (superior to the original ±0.5%), reduced noise (20 µVrms vs. 60 µVrms), and identical 1.225V output with 12 mA current. These parts are suitable for applications requiring tighter voltage regulation. Operating temperature range is -40°C to 85°C, which covers the original -40°C to 125°C range except for the upper 40°C margin.

Extended Temperature Range Alternative: LM4041AEM3-1.2+T (Analog Devices Inc./Maxim) provides ±0.1% tolerance with -40°C to 125°C operating range, matching the original temperature specification. This part is recommended for designs requiring both improved tolerance and full temperature coverage.

Tolerance Trade-off Option: LM4041B12IDBZR and LM4041B12IDBZT offer ±0.2% tolerance (intermediate between original and A-grade parts) with improved noise performance (20 µVrms). These parts are suitable for cost-optimized designs where ±0.5% tolerance is not required but better performance than the original is desired.

All substitute parts maintain ROHS3 compliance and SOT-23-3 packaging, ensuring regulatory alignment and mechanical compatibility.

Frequently Asked Questions (FAQ)

Q: Can ZXRE4041CFTA directly replace ZXRE4041CFTC without circuit modifications? A: Yes. ZXRE4041CFTA is a parametric equivalent with identical electrical specifications (1.225V, ±0.5%, 12 mA, 100 ppm/°C) and package (SOT-23-3). No circuit changes are required. The only difference is product status: ZXRE4041CFTA is active with full availability.

Q: What is the difference between the LM4041A and LM4041B series? A: The primary difference is tolerance grade. LM4041A parts specify ±0.1% tolerance, while LM4041B parts specify ±0.2% tolerance. Both maintain 1.225V output, 12 mA current, and 100 ppm/°C temperature coefficient. LM4041A is recommended for applications requiring tighter voltage regulation; LM4041B is suitable for general-purpose applications with moderate tolerance requirements.

Q: Why do some substitutes have different operating temperature ranges? A: Texas Instruments LM4041A and LM4041B series are rated -40°C to 85°C, while Analog Devices Inc./Maxim LM4041AEM3-1.2+T extends to -40°C to 125°C. If your application requires operation above 85°C, select the Analog Devices part or the direct equivalent ZXRE4041CFTA.

Q: Are all substitute parts available in the same packaging options? A: All listed substitutes use SOT-23-3 package (TO-236-3, SC-59). Packaging variants differ by tape format: Cut Tape (CT) & Digi-Reel, Tape & Reel (TR), or unspecified. Verify packaging availability with your supplier based on assembly requirements.

Q: What is the significance of the cathode current specification? A: Cathode current (ranging from 30 µA to 80 µA across substitutes) represents the minimum operating current required to maintain regulation. The original ZXRE4041CFTC specifies 30 µA. Substitutes with higher cathode current (60-80 µA) require slightly more bias current but maintain the same output voltage and tolerance. This is not a limiting factor for most applications.

Q: Can I use LM4041AIM3-1.2+T (20 mA output) as a substitute for the 12 mA original? A: LM4041AIM3-1.2+T is not recommended as a direct substitute. While it maintains 1.225V output and ±0.1% tolerance, the 20 mA output current specification differs from the original 12 mA. Use this part only if your circuit design specifically requires 20 mA output capability.

Q: Are all substitutes RoHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance, ensuring regulatory alignment with the original ZXRE4041CFTC.

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