REF02AU/2K5 Equivalent & Substitute Parts

Part Overview

The REF02AU/2K5 is a Series Voltage Reference IC manufactured by Texas Instruments, delivering a fixed 5V output with ±0.3% tolerance in an 8-SOIC surface mount package. This active product operates across an input voltage range of 8V to 40V and supplies 21 mA output current, making it suitable for precision analog applications requiring stable voltage references. Substitute parts are identified based on matching output voltage, package type, mounting configuration, and electrical performance parameters that maintain functional compatibility within system designs.

Key Parameters

Parameter	REF02AU/2K5
Manufacturer	Texas Instruments
Output Voltage (Fixed)	5V
Output Current	21 mA
Tolerance	±0.3%
Temperature Coefficient	15 ppm/°C
Input Voltage Range	8V ~ 40V
Supply Current	1.4 mA
Operating Temperature	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the REF02AU/2K5 are qualified based on the following criteria:

Primary Compatibility Requirements:

Fixed 5V output voltage
8-SOIC surface mount package (0.154", 3.90mm Width)
Active product status
ROHS3 compliance

Secondary Electrical Parameters:

Output current capacity (minimum 10 mA; REF02AU/2K5 requires 21 mA)
Tolerance specification (±0.3% or better)
Temperature coefficient performance
Input voltage range overlap (minimum 8V to 40V compatibility window)
Operating temperature range (-40°C to 85°C minimum)

Substitute parts are grouped into three categories based on tolerance and performance characteristics: precision grade (±0.06% to ±0.1%), standard grade (±1%), and performance-matched alternatives with enhanced output current capability.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Tolerance	Temp Coeff	Input Range	Supply Current	Operating Temp	Package	Product Status
REF02AU/2K5	Texas Instruments	5V	21 mA	±0.3%	15 ppm/°C	8V ~ 40V	1.4 mA	-40°C ~ 85°C	8-SOIC	Active
ADR02ARZ-REEL	Analog Devices Inc.	5V	10 mA	±0.1%	10 ppm/°C	7V ~ 36V	1 mA	-40°C ~ 125°C	8-SOIC	Active
ADR02ARZ-REEL7	Analog Devices Inc.	5V	10 mA	±0.1%	10 ppm/°C	7V ~ 36V	1 mA	-40°C ~ 125°C	8-SOIC	Active
ADR02BRZ	Analog Devices Inc.	5V	10 mA	±0.06%	3 ppm/°C	7V ~ 36V	1 mA	-40°C ~ 125°C	8-SOIC	Active
ADR02BRZ-REEL7	Analog Devices Inc.	5V	10 mA	±0.06%	3 ppm/°C	7V ~ 36V	1 mA	-40°C ~ 125°C	8-SOIC	Active
MAX6175AASA+	Analog Devices Inc./Maxim Integrated	5V	30 mA	±0.06%	3 ppm/°C	7V ~ 40V	700 µA	-40°C ~ 125°C	8-SOIC	Active
REF02CESA+	Analog Devices Inc./Maxim Integrated	5V	21 mA	±1%	65 ppm/°C	8V ~ 30V	1.6 mA	-40°C ~ 85°C	8-SOIC	Active
REF02CESA+T	Analog Devices Inc./Maxim Integrated	5V	21 mA	±1%	65 ppm/°C	8V ~ 30V	1.6 mA	-40°C ~ 85°C	8-SOIC	Active
REF02CSA+	Analog Devices Inc./Maxim Integrated	5V	21 mA	±1%	65 ppm/°C	8V ~ 30V	1.6 mA	0°C ~ 70°C	8-SOIC	Active
REF02CSA+T	Analog Devices Inc./Maxim Integrated	5V	21 mA	±1%	65 ppm/°C	8V ~ 30V	1.6 mA	0°C ~ 70°C	8-SOIC	Active
REF02CSZ	Analog Devices Inc.	5V	10 mA	±1%	65 ppm/°C	8V ~ 36V	1.6 mA	-40°C ~ 85°C	8-SOIC	Active

Engineering Selection Recommendations

Direct Functional Equivalents (Matched Output Current): REF02CESA+, REF02CESA+T, REF02CSA+, and REF02CSA+T deliver the same 21 mA output current as the REF02AU/2K5. These parts maintain compatibility with applications requiring full current capacity. REF02CESA+ and REF02CESA+T operate across -40°C to 85°C, matching the original temperature range. REF02CSA+ and REF02CSA+T operate within 0°C to 70°C, suitable for commercial temperature applications. All are ROHS3 compliant and active products.

Enhanced Precision Alternatives (Higher Tolerance Performance): ADR02ARZ-REEL, ADR02ARZ-REEL7, ADR02BRZ, and ADR02BRZ-REEL7 offer superior tolerance specifications (±0.1% and ±0.06% respectively) compared to the REF02AU/2K5 (±0.3%). These Analog Devices parts deliver lower temperature coefficients and extended operating ranges to 125°C. Output current is limited to 10 mA, requiring circuit redesign if full 21 mA capacity is essential.

High Current Alternative: MAX6175AASA+ provides 30 mA output current with ±0.06% tolerance and 3 ppm/°C temperature coefficient, exceeding the REF02AU/2K5 performance envelope. Input voltage range extends to 40V, matching the original specification. Operating temperature extends to 125°C. This part is suitable for applications requiring enhanced current delivery and precision.

Lower Tolerance Substitute (Cost-Optimized): REF02CSZ operates within ±1% tolerance with 10 mA output current. This part maintains the -40°C to 85°C temperature range and 8V to 36V input compatibility. Selection is appropriate for applications where ±0.3% tolerance is not critical.

All substitute parts are active products with ROHS3 compliance and identical 8-SOIC packaging, ensuring mechanical and thermal compatibility.

Frequently Asked Questions (FAQ)

Q: Can ADR02ARZ-REEL or ADR02BRZ replace REF02AU/2K5 in all applications? A: These Analog Devices parts are electrically compatible for 5V reference applications but deliver only 10 mA output current versus 21 mA from the REF02AU/2K5. Substitution is valid only if the application circuit requires 10 mA or less. Both parts offer superior tolerance (±0.1% and ±0.06%) and lower temperature coefficients, making them suitable for precision-critical designs within current constraints.

Q: What is the difference between REF02CSA+ and REF02CSA+T? A: Both parts are electrically identical with 5V output, 21 mA current, and ±1% tolerance. REF02CSA+ is supplied in Tube packaging, while REF02CSA+T is supplied in Tape & Reel format. Operating temperature range differs: REF02CSA+ operates 0°C to 70°C (commercial), while REF02CSA+T also operates 0°C to 70°C. Selection depends on packaging requirements for assembly processes.

Q: Is MAX6175AASA+ a direct replacement for REF02AU/2K5? A: MAX6175AASA+ is mechanically and electrically compatible in the 8-SOIC package with 5V fixed output. It exceeds REF02AU/2K5 specifications with 30 mA output current, ±0.06% tolerance, and 3 ppm/°C temperature coefficient. Input voltage range (7V to 40V) and operating temperature (-40°C to 125°C) are compatible. This part is suitable as a direct replacement with enhanced performance characteristics.

Q: Why do some substitutes have lower output current ratings? A: ADR02 series parts (10 mA) and REF02CSZ (10 mA) are designed for lower current applications, reducing quiescent current consumption and thermal dissipation. These parts are suitable for precision reference circuits where load current is limited. Applications requiring the full 21 mA output of REF02AU/2K5 must use REF02CESA+, REF02CESA+T, REF02CSA+, REF02CSA+T, or MAX6175AASA+.

Q: Are all substitute parts ROHS3 compliant? A: All listed substitute parts are ROHS3 compliant and active products, meeting current environmental and regulatory requirements for electronic component manufacturing and distribution.

Q: What is the significance of packaging variants (REEL, REEL7, Tube, Tape & Reel)? A: Packaging variants indicate different supply formats for manufacturing assembly. Cut Tape (CT) & Digi-Reel® and Tape & Reel (TR) formats are used for automated pick-and-place assembly. Tube packaging is used for manual assembly or lower-volume applications. Electrical performance is identical across packaging variants; selection depends on production process requirements.

Q: Can REF02CSZ substitute for REF02AU/2K5 in temperature-critical applications? A: REF02CSZ operates within the same -40°C to 85°C temperature range as REF02AU/2K5 and maintains 8V to 36V input compatibility. However, it delivers only 10 mA output current and has ±1% tolerance versus ±0.3%. Substitution is valid for applications where reduced current and tolerance are acceptable.

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