ZXRE4041FR Equivalent & Substitute Parts

Part Overview

The ZXRE4041FR is a shunt voltage reference IC manufactured by Diodes Incorporated, designed for precision voltage reference applications requiring a fixed 1.225V output. This Surface Mount device in SOT-23-3 packaging delivers 12 mA output current with ±3% tolerance and operates across the industrial temperature range of -40°C to 125°C. The product is currently obsolete, making equivalent substitutes necessary for new designs and ongoing production support.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution of the ZXRE4041FR is determined by the following core electrical and mechanical parameters:

Electrical Compatibility Requirements:

Fixed output voltage of 1.225V
Output current capability of 12 mA minimum
Shunt reference type
Temperature coefficient of 100ppm/°C or better
Operating temperature range supporting -40°C to 125°C minimum

Mechanical Compatibility Requirements:

Surface Mount or Through Hole mounting (both acceptable for circuit redesign)
SOT-23-3 or TO-92-3 packaging

Tolerance Considerations: Substitutes with equal or tighter tolerance (±3% or better) maintain or improve circuit performance. Substitutes with looser tolerance do not qualify.

The substitute parts listed below meet all core electrical requirements and are available in active product status or with documented inventory. Tolerance grades range from ±0.1% to ±1%, all superior to the original ±3% specification.

Parameter Comparison

Parameter	ZXRE4041FR	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
Reference Type	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt
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	±3%	±0.1%	±0.2%	±0.5%	±0.5%	±1%	±1%	±1%
Temperature Coefficient	100ppm/°C	100ppm/°C	100ppm/°C	100ppm/°C	100ppm/°C	150ppm/°C	150ppm/°C	150ppm/°C
Noise (10Hz-10kHz)	60µVrms	20µVrms	20µVrms	20µVrms	20µVrms	20µVrms	20µVrms	20µVrms
Cathode Current	30 µA	65 µA	65 µA	80 µA	65 µA	80 µA	80 µA	70 µA
Operating Temperature	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 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

For Active Production and New Designs:

LM4041AIZ-1.2/NOPB (Texas Instruments) is the primary recommended substitute. This part offers ±0.1% tolerance with 100ppm/°C temperature coefficient, matching the original temperature performance while providing superior accuracy. Active product status ensures long-term availability and supply chain stability. ROHS3 compliance and REACH unaffected status align with current regulatory requirements.

LM4041DIZ-1.2/NOPB (Texas Instruments) provides an alternative with ±1% tolerance and active product status. This option balances cost considerations with acceptable performance margins for applications where the tighter tolerance of the AIZ variant is not required.

For Tolerance-Critical Applications:

LM4041BIZ-1.2/NOPB (National Semiconductor) delivers ±0.2% tolerance with 100ppm/°C temperature coefficient and active product status, suitable for precision reference applications requiring intermediate accuracy between the AIZ and DIZ variants.

LM4041CIZ-1.2/NOPB and LM4041C12ILP (Texas Instruments) both provide ±0.5% tolerance with active product status and 100ppm/°C temperature coefficient, appropriate for general-purpose reference applications.

Temperature Range Consideration:

All substitute parts operate to -40°C to 85°C maximum, which is 40°C lower than the original ZXRE4041FR specification of -40°C to 125°C. Applications requiring operation above 85°C require circuit redesign or alternative reference architectures.

Packaging Transition:

The ZXRE4041FR uses Surface Mount SOT-23-3 packaging. All substitutes use Through Hole TO-92-3 packaging, requiring PCB layout modification. This transition is acceptable for production redesigns and provides improved thermal characteristics for through-hole mounting.

Frequently Asked Questions (FAQ)

Q: Can LM4041 series parts directly replace the ZXRE4041FR without circuit modification?

A: Electrical substitution is direct—all LM4041 variants maintain the 1.225V fixed output, 12 mA output current, and shunt reference topology. However, packaging differs: ZXRE4041FR is Surface Mount (SOT-23-3) while LM4041 substitutes are Through Hole (TO-92-3), requiring PCB layout changes.

Q: What is the significance of tolerance differences between substitute options?

A: Tolerance defines the initial accuracy of the 1.225V output at 25°C. The ZXRE4041FR specifies ±3%. Substitutes range from ±0.1% (LM4041AIZ-1.2/NOPB) to ±1% (LM4041D12ILP, LM4041D12ILPE3, LM4041DIZ-1.2/NOPB). Tighter tolerance improves circuit accuracy but may increase cost. All substitutes meet or exceed the original specification.

Q: Why do substitute parts have lower maximum operating temperature?

A: The ZXRE4041FR operates to 125°C; LM4041 substitutes operate to 85°C maximum. This 40°C difference reflects different design specifications between manufacturers. Applications requiring 125°C operation cannot use these substitutes without circuit redesign.

Q: What is the difference between temperature coefficient values of 100ppm/°C and 150ppm/°C?

A: Temperature coefficient describes output voltage drift per degree Celsius change. Lower values (100ppm/°C) indicate better temperature stability. LM4041AIZ-1.2/NOPB, LM4041BIZ-1.2/NOPB, and LM4041C variants maintain 100ppm/°C matching the original. LM4041D variants specify 150ppm/°C, resulting in greater voltage drift across temperature extremes.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitutes carry ROHS3 Compliant status and REACH Unaffected designation, meeting current environmental and regulatory requirements equivalent to the original ZXRE4041FR.

Q: What does "Active" versus "Obsolete" product status mean for part selection?

A: Active status indicates the manufacturer actively produces and supports the part with guaranteed long-term availability. Obsolete status indicates production has ended. For new designs and ongoing production, select Active parts: LM4041AIZ-1.2/NOPB, LM4041BIZ-1.2/NOPB, LM4041C12ILP, LM4041CIZ-1.2/NOPB, or LM4041DIZ-1.2/NOPB. LM4041D12ILPE3 is obsolete and should be avoided for new applications.

Q: How does cathode current affect circuit design?

A: Cathode current represents the minimum operating current required to maintain regulation. The ZXRE4041FR specifies 30 µA; substitutes range from 65 µA to 80 µA. Higher cathode current increases power consumption in the reference circuit. This parameter must be evaluated against the application's current budget and load requirements.

Q: Can I use LM4041D12ILPE3 despite its obsolete status?

A: LM4041D12ILPE3 is obsolete and carries supply risk. While 2,831 pieces are currently in inventory, future availability is not guaranteed. For new designs, select active alternatives. For legacy system support where this part is already deployed, current inventory may support limited production runs, but transition planning to an active substitute is recommended.

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