ZXRE125FR Equivalent & Substitute Parts

Part Overview

The ZXRE125FR 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 identification of functionally equivalent alternatives essential for ongoing design support and production continuity. The part operates across the industrial temperature range of -40°C to 85°C and delivers 20 mA output current with low noise characteristics suitable for precision analog applications.

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
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the ZXRE125FR is determined by the following critical parameters: reference type (shunt), output type (fixed), nominal output voltage (1.22V ±tolerance band), output current capability (20 mA), and operating temperature range. The substitute parts are grouped into two categories based on mounting technology:

Surface Mount Alternative: ZXRE125FFTA maintains identical electrical specifications (1.22V, ±3%, 75ppm/°C, 20 mA) while transitioning to SOT-23-3 packaging. This part is manufactured by the same supplier (Diodes Incorporated) and carries active product status.

Through-Hole Alternatives: LM285Z-1.2/NOPB, LM385BZ-1.2/NOPB, and LM385Z-1.2/NOPB are Texas Instruments shunt voltage references with nominal output voltage of 1.235V (within the application tolerance band), 20 mA output current, and TO-92-3 packaging. These parts maintain the through-hole mounting requirement while offering improved tolerance specifications (±1% or -2.43%/+2.02%) and active product status.

Parameter Comparison

Parameter	ZXRE125FR	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

For Direct Through-Hole Replacement: LM285Z-1.2/NOPB, LM385BZ-1.2/NOPB, and LM385Z-1.2/NOPB are suitable direct substitutes in TO-92-3 packaging. All three maintain the 20 mA output current and 60µVrms noise specification. The Texas Instruments parts offer improved tolerance performance (±1% or -2.43%/+2.02%) compared to the original ±3% specification. LM285Z-1.2/NOPB supports the full -40°C to 85°C temperature range, while LM385BZ-1.2/NOPB and LM385Z-1.2/NOPB operate within 0°C to 70°C. All substitute parts carry active product status and ROHS3 compliance.

For Surface Mount Redesign: ZXRE125FFTA provides identical electrical performance to the original ZXRE125FR while enabling transition to surface mount assembly. This part maintains the same manufacturer (Diodes Incorporated), tolerance (±3%), temperature coefficient (75ppm/°C), and operating temperature range (-40°C to 85°C). ZXRE125FFTA carries active product status and ROHS3 compliance.

Temperature Range Consideration: Applications requiring operation below 0°C or above 70°C must use LM285Z-1.2/NOPB (supports -40°C to 85°C) or ZXRE125FFTA (supports -40°C to 85°C). LM385BZ-1.2/NOPB and LM385Z-1.2/NOPB are limited to 0°C to 70°C operation.

Frequently Asked Questions (FAQ)

Q: Can LM385BZ-1.2/NOPB or LM385Z-1.2/NOPB be used in applications requiring -40°C operation?

A: No. LM385BZ-1.2/NOPB and LM385Z-1.2/NOPB specify a minimum operating temperature of 0°C. Applications requiring -40°C operation must use LM285Z-1.2/NOPB or ZXRE125FFTA.

Q: What is the voltage difference between ZXRE125FR (1.22V) and the Texas Instruments alternatives (1.235V)?

A: The 15 mV difference represents a 1.2% variation. For applications with tight voltage tolerance requirements, verify that the substitute part's tolerance band encompasses the original design specification.

Q: Is ZXRE125FFTA a direct pin-for-pin replacement?

A: ZXRE125FFTA maintains identical electrical specifications and pin configuration but uses SOT-23-3 surface mount packaging instead of TO-92-3 through-hole packaging. PCB layout modification is required.

Q: Do all substitute parts meet RoHS3 compliance?

A: Yes. ZXRE125FFTA, LM285Z-1.2/NOPB, LM385BZ-1.2/NOPB, and LM385Z-1.2/NOPB all carry ROHS3 Compliant status.

Q: What is the significance of the different cathode current specifications?

A: Cathode current (8 µA for ZXRE125FR, 10 µA for LM285Z-1.2/NOPB, and 15 µA for LM385 variants) represents the minimum operating current. Applications must ensure bias current exceeds these minimums for stable operation.

Q: Are there differences in temperature coefficient between the original and substitute parts?

A: Yes. ZXRE125FR and ZXRE125FFTA specify 75ppm/°C, while all Texas Instruments alternatives (LM285Z-1.2/NOPB, LM385BZ-1.2/NOPB, LM385Z-1.2/NOPB) specify 150ppm/°C. This affects long-term voltage stability across temperature variations.

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