ZXRE1004FR Equivalent & Substitute Parts

Part Overview

The ZXRE1004FR is a shunt voltage reference IC manufactured by Diodes Incorporated, designed to provide a fixed 1.22V output with ±3% tolerance. This through-hole TO-92 packaged component is classified as obsolete, making equivalent substitutes necessary for new designs and production continuity. The part operates across -40°C to 85°C and delivers 20 mA output current, serving applications requiring stable voltage reference generation in power management circuits.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Fixed
Voltage - Output (Min/Fixed)	1.22V
Current - Output	20 mA
Tolerance	±3%
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
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Reference Type & Output Type: All substitutes must be shunt-type fixed voltage references
Output Voltage: Nominal 1.22V to 1.235V range acceptable (within typical application tolerance windows)
Output Current: 20 mA capability required
Mounting Type: Through-hole substitutes maintain direct PCB compatibility; surface-mount alternatives require board redesign
Operating Temperature Range: Must support minimum -40°C to 85°C envelope
Compliance: RoHS3 and REACH compliance required for regulatory alignment

Substitutes are grouped into two categories: direct through-hole replacements (ZXRE125FFTA requires packaging change to SOT-23 surface mount) and pin-compatible through-hole alternatives (LM285Z-1.2/NOPB, LM385BZ-1.2/NOPB, LM385Z-1.2/NOPB).

Parameter Comparison

Parameter	ZXRE1004FR	ZXRE125FFTA	LM285Z-1.2/NOPB	LM385BZ-1.2/NOPB	LM385Z-1.2/NOPB
Manufacturer	Diodes Incorporated	Diodes Incorporated	Texas Instruments	Texas Instruments	Texas Instruments
Reference Type	Shunt	Shunt	Shunt	Shunt	Shunt
Output Type	Fixed	Fixed	Fixed	Fixed	Fixed
Voltage - Output (Min/Fixed)	1.22V	1.22V	1.235V	1.235V	1.235V
Current - Output	20 mA	20 mA	20 mA	20 mA	20 mA
Tolerance	±3%	±3%	±1%	±1%	-2.43%, +2.02%
Temperature Coefficient	75ppm/°C	75ppm/°C	150ppm/°C	150ppm/°C	150ppm/°C
Noise - 10Hz to 10kHz	60µVrms	60µVrms	60µVrms	60µVrms	60µVrms
Current - Cathode	8 µA	8 µA	10 µA	15 µA	15 µA
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C
Mounting Type	Through Hole	Surface Mount	Through Hole	Through Hole	Through Hole
Package / Case	TO-92-3	SOT-23-3	TO-92-3	TO-92-3	TO-92-3
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Pin-Compatible Through-Hole Replacements:

LM285Z-1.2/NOPB and LM385Z-1.2/NOPB are pin-compatible through-hole alternatives with active product status. Both maintain the TO-92-3 package and support the full -40°C to 85°C operating range. LM285Z-1.2/NOPB offers superior tolerance (±1% vs ±3%) and lower cathode current (10 µA vs 8 µA). LM385Z-1.2/NOPB provides asymmetric tolerance (-2.43%, +2.02%) with 15 µA cathode current. Both are RoHS3 compliant and widely available.

Surface-Mount Alternative:

ZXRE125FFTA is the manufacturer-recommended substitute from Diodes Incorporated, maintaining identical electrical specifications (1.22V, ±3%, 75ppm/°C) and operating temperature range. This part requires PCB redesign due to SOT-23-3 surface-mount packaging but offers higher inventory availability (4905 units) and active product status.

Temperature Range Consideration:

LM385BZ-1.2/NOPB operates within 0°C to 70°C, which does not cover the full -40°C to 85°C envelope of the original part. This substitute is suitable only for applications with restricted temperature requirements.

Frequently Asked Questions (FAQ)

Q: Can LM285Z-1.2/NOPB directly replace ZXRE1004FR without circuit modification?

A: Yes. Both parts are shunt voltage references in TO-92-3 packages with identical pin configurations, 1.22V to 1.235V output range, and 20 mA output current. The ±1% tolerance of LM285Z-1.2/NOPB is tighter than the original ±3%, making it functionally compatible for existing designs.

Q: What is the difference between LM285Z-1.2/NOPB and LM385Z-1.2/NOPB?

A: Both are Texas Instruments shunt references with identical output voltage and current specifications. LM285Z-1.2/NOPB operates -40°C to 85°C with 10 µA cathode current and ±1% tolerance. LM385Z-1.2/NOPB operates 0°C to 70°C with 15 µA cathode current and -2.43%, +2.02% tolerance. Select LM285Z-1.2/NOPB for full temperature range applications.

Q: Why is ZXRE125FFTA listed as a substitute if it uses a different package?

A: ZXRE125FFTA is the manufacturer-recommended active equivalent from Diodes Incorporated with identical electrical performance (1.22V, ±3%, 75ppm/°C). The SOT-23-3 surface-mount package requires PCB layout changes but is suitable for new designs or redesigns prioritizing component availability and active product status.

Q: Are all substitutes RoHS3 compliant?

A: Yes. ZXRE125FFTA, LM285Z-1.2/NOPB, LM385BZ-1.2/NOPB, and LM385Z-1.2/NOPB are all RoHS3 compliant and REACH unaffected, meeting current regulatory requirements.

Q: Which substitute offers the best tolerance specification?

A: LM285Z-1.2/NOPB and LM385BZ-1.2/NOPB both provide ±1% tolerance, compared to the original ±3%. LM385Z-1.2/NOPB offers asymmetric tolerance (-2.43%, +2.02%). For applications requiring the tightest tolerance with full temperature range support, LM285Z-1.2/NOPB is the optimal choice.

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