ZXRE1004DR Shunt Voltage Reference IC - Equivalent & Substitute Parts

Part Overview

The ZXRE1004DR is a shunt voltage reference IC manufactured by Diodes Incorporated, designed to provide a fixed 1.22V output with ±1% tolerance. This component is classified as a Power Management (PMIC) device and is packaged in a TO-92 through-hole configuration. The product is currently obsolete, making identification of suitable substitute components essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Fixed
Voltage - Output (Min/Fixed)	1.22V
Current - Output	20 mA
Tolerance	±1%
Temperature Coefficient	75ppm/°C
Noise - 10Hz to 10kHz	60µVrms
Current - Cathode	8 µA
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Through Hole
Package / Case	TO-92-3

Substitute Part Grouping Explanation

Substitute components for the ZXRE1004DR must satisfy the following criteria:

Reference Type: Shunt voltage reference
Output Type: Fixed voltage output
Output Voltage: Nominal 1.2V range (1.22V ± tolerance band)
Current Rating: 20 mA output capability
Tolerance: ±1% or better
Package: TO-92-3 through-hole configuration
Operating Temperature Range: Minimum -40°C to 85°C coverage

The identified substitute parts meet these electrical and mechanical requirements while offering improved product status and compliance certifications.

Parameter Comparison

Parameter	ZXRE1004DR	LM285Z-1.2/NOPB	LM385BZ-1.2/NOPB
Manufacturer	Diodes Incorporated	Texas Instruments	Texas Instruments
Reference Type	Shunt	Shunt	Shunt
Output Type	Fixed	Fixed	Fixed
Voltage - Output (Min/Fixed)	1.22V	1.235V	1.235V
Current - Output	20 mA	20 mA	20 mA
Tolerance	±1%	±1%	±1%
Temperature Coefficient	75ppm/°C	150ppm/°C	150ppm/°C
Noise - 10Hz to 10kHz	60µVrms	60µVrms	60µVrms
Current - Cathode	8 µA	10 µA	15 µA
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-92-3	TO-92-3	TO-92-3
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

LM285Z-1.2/NOPB is the primary substitute for the ZXRE1004DR. This Texas Instruments component maintains full electrical compatibility with identical output current (20 mA), tolerance (±1%), and noise specifications (60µVrms). The operating temperature range (-40°C to 85°C) matches the original part exactly. The LM285Z-1.2/NOPB carries Active product status with ROHS3 compliance, ensuring long-term availability and regulatory alignment. The output voltage of 1.235V represents a 1.2% increase from the original 1.22V, which remains within typical system tolerance bands for 1.2V reference applications.

LM385BZ-1.2/NOPB serves as a secondary substitute option. This component shares identical electrical specifications with the LM285Z-1.2/NOPB but operates within a reduced temperature range (0°C to 70°C). Selection of the LM385BZ-1.2/NOPB is appropriate only for applications where the full -40°C to 85°C range is not required. The higher cathode current (15 µA versus 8 µA in the original) may impact circuit design in applications with strict power consumption constraints.

Both substitute parts are ROHS3 compliant and carry Active product status, providing superior long-term supply chain stability compared to the obsolete ZXRE1004DR.

Frequently Asked Questions (FAQ)

Q: Can the LM285Z-1.2/NOPB directly replace the ZXRE1004DR in existing designs?

A: Yes. Both components are shunt voltage references with identical TO-92-3 packaging, 20 mA output current, ±1% tolerance, and 60µVrms noise specifications. The output voltage difference (1.235V versus 1.22V) is within standard tolerance margins for 1.2V reference applications. The matching operating temperature range (-40°C to 85°C) ensures compatibility across all environmental conditions.

Q: What is the difference between the LM285Z-1.2/NOPB and LM385BZ-1.2/NOPB?

A: Both components provide identical electrical performance with 1.235V output, ±1% tolerance, and 60µVrms noise. The primary differences are operating temperature range and cathode current. The LM285Z-1.2/NOPB operates from -40°C to 85°C with 10 µA cathode current, while the LM385BZ-1.2/NOPB operates from 0°C to 70°C with 15 µA cathode current. Select the LM285Z-1.2/NOPB for applications requiring the full temperature range or lower power consumption.

Q: Why is the temperature coefficient higher in the substitute parts?

A: The LM285Z-1.2/NOPB and LM385BZ-1.2/NOPB both exhibit a temperature coefficient of 150ppm/°C, compared to 75ppm/°C in the ZXRE1004DR. This represents a 2x increase in temperature sensitivity. For applications where output voltage stability across temperature is critical, circuit-level compensation or selection of alternative reference architectures may be necessary.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both the LM285Z-1.2/NOPB and LM385BZ-1.2/NOPB are ROHS3 compliant. The original ZXRE1004DR is RoHS non-compliant. Substitution with either recommended part ensures regulatory compliance for new designs and updated manufacturing processes.

Q: What is the significance of the cathode current specification?

A: Cathode current represents the minimum operating current required to maintain regulation. The ZXRE1004DR requires 8 µA, while the LM285Z-1.2/NOPB requires 10 µA and the LM385BZ-1.2/NOPB requires 15 µA. In applications with very high impedance load paths or strict power budgets, the higher cathode current of the substitute parts may require circuit redesign to ensure adequate bias current.

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