ZR40402R41 Equivalent & Substitute Parts

Part Overview

The ZR40402R41 is a shunt voltage reference IC manufactured by Diodes Incorporated, designed to provide a fixed 4.096V output with ±2% tolerance. This component is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design support and production requirements. Shunt voltage reference ICs in the 4.096V fixed output category serve critical roles in precision analog circuits, power management systems, and measurement applications where stable reference voltages are essential.

Key Parameters

Parameter	Value
Manufacturer Part Number	ZR40402R41
Manufacturer	Diodes Incorporated
Reference Type	Shunt
Output Voltage (Fixed)	4.096V
Output Current	15 mA
Tolerance	±2%
Temperature Coefficient	100 ppm/°C
Noise (10Hz to 10kHz)	90 µVrms
Cathode Current	60 µA
Operating Temperature Range	-40°C to 85°C
Package Type	TO-92-3 (TO-226AA)
Mounting Type	Through Hole
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the ZR40402R41 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Output voltage: 4.096V (fixed)
Output current capability: 15 mA
Package/Case: TO-92-3 (TO-226AA) through-hole configuration
Operating temperature range: -40°C to 85°C

Tolerance Considerations: The ZR40402R41 specifies ±2% tolerance. Substitute parts with equal or tighter tolerance specifications (±0.1%, ±0.2%, ±0.5%, ±1%) are electrically compatible and functionally superior. Parts with looser tolerance specifications are not suitable substitutes.

Secondary Parameters: Temperature coefficient, noise characteristics, and cathode current variations within the substitute group do not preclude substitution but may influence selection based on application-specific precision requirements.

Compliance Status: The original part is RoHS non-compliant and obsolete. Active substitute options with ROHS3 compliance are available, providing improved environmental and regulatory alignment for new designs and production continuity.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Tolerance	Temp Coeff	Noise (10Hz-10kHz)	Cathode Current	Package	Status	RoHS
ZR40402R41	Diodes Inc.	4.096V	15 mA	±2%	100 ppm/°C	90 µVrms	60 µA	TO-92-3	Obsolete	Non-compliant
LM4040AIZ-4.1/NOPB	Texas Instruments	4.096V	15 mA	±0.1%	100 ppm/°C	80 µVrms	73 µA	TO-92-3	Active	ROHS3 Compliant
LM4040BIZ-4.1/NOPB	National Semiconductor	4.096V	15 mA	±0.2%	100 ppm/°C	80 µVrms	73 µA	TO-92-3	Obsolete	ROHS3 Compliant
LM4040C41ILP	Texas Instruments	4.096V	15 mA	±0.5%	100 ppm/°C	80 µVrms	88 µA	TO-92-3	Active	ROHS3 Compliant
LM4040CIZ-4.1/NOPB	National Semiconductor	4.096V	15 mA	±0.5%	100 ppm/°C	80 µVrms	73 µA	TO-92-3	Obsolete	ROHS3 Compliant
LM4040D41ILP	Texas Instruments	4.096V	15 mA	±1%	150 ppm/°C	80 µVrms	88 µA	TO-92-3	Active	ROHS3 Compliant
LM4040D41ILPE3	Texas Instruments	4.096V	15 mA	±1%	150 ppm/°C	80 µVrms	88 µA	TO-92-3	Obsolete	ROHS3 Compliant
LM4040DIZ-4.1/NOPB	Texas Instruments	4.096V	15 mA	±1%	150 ppm/°C	80 µVrms	78 µA	TO-92-3	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation for New Designs: LM4040AIZ-4.1/NOPB (Texas Instruments) is the preferred substitute. This part is currently active in production, ROHS3 compliant, and offers superior tolerance specification (±0.1%) compared to the original ZR40402R41 (±2%). The tighter tolerance provides enhanced precision for applications requiring stable reference voltages. Inventory availability is substantial at 2545 units.

Alternative for Cost-Optimized Applications: LM4040DIZ-4.1/NOPB (Texas Instruments) provides functional equivalence with ±1% tolerance and active product status. This option balances performance with cost considerations while maintaining ROHS3 compliance and adequate inventory levels (1989 units).

Secondary Options: LM4040C41ILP and LM4040CIZ-4.1/NOPB both offer ±0.5% tolerance specifications. LM4040C41ILP maintains active status with ROHS3 compliance, while LM4040CIZ-4.1/NOPB is obsolete but carries substantial inventory (526,994 units), suitable for legacy production support.

Obsolete Part Considerations: LM4040BIZ-4.1/NOPB and LM4040D41ILPE3 are obsolete but ROHS3 compliant. These should be considered only when existing inventory must be consumed or when design continuity with legacy systems is required.

Frequently Asked Questions (FAQ)

Q: Can LM4040AIZ-4.1/NOPB directly replace ZR40402R41 in existing designs? A: Yes. Both parts share identical output voltage (4.096V), output current (15 mA), operating temperature range (-40°C to 85°C), and TO-92-3 package configuration. The LM4040AIZ-4.1/NOPB offers superior tolerance (±0.1% vs ±2%), making it a direct functional upgrade.

Q: What is the significance of tolerance differences between substitute options? A: Tolerance specifies the maximum deviation of output voltage from the nominal 4.096V value. The ZR40402R41 allows ±81.92mV deviation. LM4040AIZ-4.1/NOPB limits deviation to ±4.096mV. Applications requiring precise reference voltages benefit from tighter tolerance specifications; applications with relaxed precision requirements can utilize parts with ±1% or ±0.5% tolerance.

Q: Are all substitute parts pin-compatible with the original ZR40402R41? A: Yes. All listed substitutes use the TO-92-3 (TO-226AA) package configuration with identical pinout and through-hole mounting characteristics, enabling direct socket replacement without PCB modifications.

Q: Why is RoHS compliance important for substitute selection? A: RoHS3 compliance indicates adherence to current environmental and hazardous substance restrictions. The original ZR40402R41 is RoHS non-compliant. Selecting ROHS3-compliant substitutes ensures compatibility with modern manufacturing standards, supply chain requirements, and regulatory frameworks for new production runs.

Q: What is the difference between active and obsolete product status? A: Active parts are in current production with guaranteed long-term availability and manufacturer support. Obsolete parts are no longer manufactured; substitution is necessary for ongoing production. All recommended primary options are active status parts.

Q: How do temperature coefficient variations affect circuit performance? A: Temperature coefficient (ppm/°C) quantifies output voltage drift across the operating temperature range. The ZR40402R41 specifies 100 ppm/°C. Most LM4040 substitutes maintain this specification; LM4040D41ILP and LM4040DIZ-4.1/NOPB specify 150 ppm/°C. For applications operating across the full -40°C to 85°C range, the higher coefficient results in approximately 7.5mV additional drift, which may be significant in precision measurement circuits.

Q: Can substitute parts with ±1% tolerance be used in applications designed for ±2% tolerance? A: Yes. Tighter tolerance specifications are always compatible with designs specified for looser tolerances. A ±1% part satisfies any requirement for ±2% tolerance performance.

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