REF02AU Equivalent & Substitute Parts

Part Overview

The REF02AU is a series voltage reference IC manufactured by Texas Instruments, designed to provide a fixed 5V output with ±0.3% tolerance. This active product operates across an input voltage range of 8V to 40V and delivers 21 mA output current, making it suitable for precision analog applications requiring stable reference voltages. The 8-SOIC surface mount package enables integration into compact circuit designs. Substitute parts are identified when equivalent electrical performance, mechanical compatibility, and compliance certifications align with application requirements.

Key Parameters

Parameter	REF02AU Specification
Output Voltage (Fixed)	5V
Output Current	21 mA
Voltage Tolerance	±0.3%
Temperature Coefficient	15 ppm/°C
Noise (0.1Hz to 10Hz)	4 µVp-p
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
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution eligibility for the REF02AU is determined by the following critical parameters:

Fixed Output Voltage: All substitutes must provide 5V output to maintain circuit compatibility
Package / Case: All substitutes must use 8-SOIC form factor for mechanical interchangeability
Mounting Type: Surface mount requirement must be maintained
Output Current Capability: Substitutes must support minimum 21 mA output current or higher
Input Voltage Range: Substitutes must accommodate the 8V to 40V input specification or a compatible superset
Operating Temperature Range: Substitutes must cover at least the -40°C to 85°C range
Compliance: RoHS3 compliance and REACH unaffected status required

Substitute parts are grouped into two categories based on tolerance and performance characteristics:

Category A - Tighter Tolerance Substitutes (ADR02 Series): Analog Devices ADR02ARZ-REEL, ADR02ARZ-REEL7, ADR02BRZ, and ADR02BRZ-REEL7 offer improved tolerance (±0.1% to ±0.06%) and lower temperature coefficients. These parts support 10 mA output current, which is lower than the REF02AU's 21 mA specification. Input voltage range is 7V to 36V.

Category B - REF02 Series Substitutes: REF02CSZ, REF02CSZ-REEL, REF02CSA+, REF02CESA+, REF02CESA+T, and REF02CSA+T maintain the REF02 base product number with ±1% tolerance and 21 mA output current capability, matching the REF02AU's current output specification.

Parameter Comparison

Parameter	REF02AU	ADR02ARZ-REEL	ADR02ARZ-REEL7	ADR02BRZ	ADR02BRZ-REEL7	REF02CSZ	REF02CSZ-REEL	REF02CSA+	REF02CESA+	REF02CESA+T	REF02CSA+T
Output Voltage	5V	5V	5V	5V	5V	5V	5V	5V	5V	5V	5V
Output Current	21 mA	10 mA	10 mA	10 mA	10 mA	10 mA	10 mA	21 mA	21 mA	21 mA	21 mA
Voltage Tolerance	±0.3%	±0.1%	±0.1%	±0.06%	±0.06%	±1%	±1%	±1%	±1%	±1%	±1%
Temperature Coefficient	15 ppm/°C	10 ppm/°C	10 ppm/°C	3 ppm/°C	3 ppm/°C	65 ppm/°C	65 ppm/°C	65 ppm/°C	65 ppm/°C	65 ppm/°C	65 ppm/°C
Noise (0.1Hz to 10Hz)	4 µVp-p	10 µVp-p	10 µVp-p	10 µVp-p	10 µVp-p	15 µVp-p	15 µVp-p	12 µVp-p	12 µVp-p	12 µVp-p	12 µVp-p
Input Voltage Range	8V ~ 40V	7V ~ 36V	7V ~ 36V	7V ~ 36V	7V ~ 36V	8V ~ 36V	8V ~ 36V	8V ~ 30V	8V ~ 30V	8V ~ 30V	8V ~ 30V
Supply Current	1.4 mA	1 mA	1 mA	1 mA	1 mA	1.6 mA	1.6 mA	1.6 mA	1.6 mA	1.6 mA	1.6 mA
Operating Temperature	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

REF02 Series Substitutes (REF02CSZ, REF02CSZ-REEL, REF02CSA+, REF02CESA+, REF02CESA+T, REF02CSA+T)

These parts maintain full compatibility with the REF02AU in terms of output current (21 mA) and package form factor. All are active products with ROHS3 compliance and REACH unaffected status. Selection among these variants depends on packaging requirements (Tube, Cut Tape & Digi-Reel, or Tape & Reel) and operating temperature range. REF02CSA+ and REF02CSA+T operate within 0°C to 70°C, which is narrower than the REF02AU's -40°C to 85°C range. REF02CSZ and REF02CSZ-REEL maintain the full -40°C to 85°C operating range. REF02CESA+ and REF02CESA+T also support -40°C to 85°C operation.

ADR02 Series Substitutes (ADR02ARZ-REEL, ADR02ARZ-REEL7, ADR02BRZ, ADR02BRZ-REEL7)

These Analog Devices parts offer superior tolerance specifications (±0.1% to ±0.06%) and lower temperature coefficients (3 to 10 ppm/°C) compared to the REF02AU. However, output current is limited to 10 mA, which is below the REF02AU's 21 mA specification. These parts are suitable only for applications where the reduced output current is acceptable. All ADR02 variants support extended operating temperature range (-40°C to 125°C) and MSL rating of 1 (Unlimited), providing superior moisture handling. All are active products with ROHS3 compliance and REACH unaffected status.

Frequently Asked Questions (FAQ)

Q: Can ADR02 series parts directly replace REF02AU in all applications?

A: ADR02 parts are mechanically compatible (8-SOIC package) and electrically compatible for 5V fixed output applications. However, the 10 mA output current specification is lower than the REF02AU's 21 mA capability. Substitution is valid only if the application circuit draws 10 mA or less from the reference output.

Q: What is the difference between REF02CSZ and REF02CSZ-REEL?

A: Both parts are electrically identical with ±1% tolerance and 10 mA output current. The difference is packaging: REF02CSZ is supplied in Tube packaging, while REF02CSZ-REEL is supplied in Cut Tape & Digi-Reel format. Selection depends on assembly process requirements and inventory management preferences.

Q: Why do some REF02 substitutes have narrower operating temperature ranges?

A: REF02CSA+ and REF02CSA+T operate within 0°C to 70°C, which is narrower than the REF02AU's -40°C to 85°C range. These parts are suitable for applications with controlled thermal environments. For applications requiring the full -40°C to 85°C range, select REF02CSZ, REF02CSZ-REEL, REF02CESA+, or REF02CESA+T.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all listed substitute parts are ROHS3 compliant and REACH unaffected, matching the REF02AU's compliance status.

Q: What does MSL rating mean for these reference ICs?

A: Moisture Sensitivity Level (MSL) indicates the component's sensitivity to moisture absorption during storage. The REF02AU has MSL 3 (168 Hours), meaning it must be used within 168 hours of opening the moisture barrier bag. All substitute parts have MSL 1 (Unlimited), indicating superior moisture resistance and longer shelf life after opening.

Q: Can I use ADR02BRZ instead of ADR02ARZ-REEL for better accuracy?

A: Yes, ADR02BRZ offers tighter tolerance (±0.06% versus ±0.1%) and lower temperature coefficient (3 ppm/°C versus 10 ppm/°C). Both are electrically and mechanically compatible. The choice depends on accuracy requirements and packaging preference (Tube for ADR02BRZ versus Cut Tape & Digi-Reel for ADR02ARZ-REEL).

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