REF02AU/2K5G4 Equivalent & Substitute Parts

Part Overview

The REF02AU/2K5G4 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 part is discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing production and maintenance applications. The REF02AU/2K5G4 operates across an input voltage range of 8V to 40V with a maximum output current of 21 mA and is suitable for precision voltage reference applications requiring low noise and stable temperature performance across industrial temperature ranges (-40°C to 85°C).

Key Parameters

Parameter	REF02AU/2K5G4
Output Voltage (Fixed)	5V
Output Tolerance	±0.3%
Output Current	21 mA
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	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/2K5G4 is determined by the following critical parameters:

Package Compatibility: All substitutes must use the 8-SOIC (0.154", 3.90mm Width) surface mount package
Output Voltage: Fixed 5V output is mandatory
Mounting Type: Surface mount configuration required
Electrical Compatibility: Output current capability must meet or exceed 21 mA; input voltage range must encompass or exceed 8V ~ 40V
Compliance: RoHS3 compliance required; REACH unaffected status required

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

Category A - Enhanced Performance Substitutes (ADR02 Series): Analog Devices ADR02ARZ-REEL, ADR02ARZ-REEL7, ADR02BRZ, and ADR02BRZ-REEL7 offer superior tolerance (±0.1% to ±0.06%), lower temperature coefficient (10 ppm/°C to 3 ppm/°C), and extended operating temperature range (-40°C to 125°C). These parts provide tighter output voltage regulation and lower noise characteristics. Output current is 10 mA, which is lower than the original part but sufficient for many applications.

Category B - Direct Functional Equivalents (REF02 Series): Analog Devices/Maxim Integrated REF02CESA+, REF02CESA+T, REF02CSA+, REF02CSA+T, REF02CSZ, and REF02CSZ-REEL maintain the REF02 base product number and deliver 21 mA output current matching the original specification. These parts are available in active production status with various packaging options.

Parameter Comparison

Parameter	REF02AU/2K5G4	ADR02ARZ-REEL	ADR02ARZ-REEL7	ADR02BRZ	ADR02BRZ-REEL7	REF02CESA+	REF02CESA+T	REF02CSA+	REF02CSA+T	REF02CSZ	REF02CSZ-REEL
Manufacturer	Texas Instruments	Analog Devices	Analog Devices	Analog Devices	Analog Devices	Analog Devices/Maxim	Analog Devices/Maxim	Analog Devices/Maxim	Analog Devices/Maxim	Analog Devices	Analog Devices
Output Voltage	5V	5V	5V	5V	5V	5V	5V	5V	5V	5V	5V
Output Tolerance	±0.3%	±0.1%	±0.1%	±0.06%	±0.06%	±1%	±1%	±1%	±1%	±1%	±1%
Output Current	21 mA	10 mA	10 mA	10 mA	10 mA	21 mA	21 mA	21 mA	21 mA	10 mA	10 mA
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	12 µVp-p	12 µVp-p	12 µVp-p	12 µVp-p	15 µVp-p	15 µVp-p
Input Voltage Range	8V ~ 40V	7V ~ 36V	7V ~ 36V	7V ~ 36V	7V ~ 36V	8V ~ 30V	8V ~ 30V	8V ~ 30V	8V ~ 30V	8V ~ 36V	8V ~ 36V
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	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C
Package	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Product Status	Discontinued	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
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

For applications requiring 21 mA output current with maintained tolerance specifications:

REF02CSA+ and REF02CSZ are the primary direct functional equivalents. Both deliver the full 21 mA output current and maintain 5V fixed output in 8-SOIC packaging. REF02CSA+ operates across 0°C to 70°C and is available in tube packaging with 75,450 units in stock. REF02CSZ extends the operating temperature range to -40°C to 85°C, matching the original part's temperature specification, and is available in tube packaging with 24,220 units in stock. Both are ROHS3 compliant and REACH unaffected.

For tape and reel packaging requirements, REF02CSZ-REEL (2,000 units) and REF02CSA+T (3,242 units) provide the same electrical specifications with alternative packaging configurations.

For applications where 10 mA output current is acceptable with enhanced performance:

ADR02ARZ-REEL and ADR02ARZ-REEL7 offer ±0.1% tolerance with 10 ppm/°C temperature coefficient and extended operating range to -40°C to 125°C. These parts provide superior voltage regulation stability. ADR02BRZ and ADR02BRZ-REEL7 deliver the tightest tolerance at ±0.06% with 3 ppm/°C temperature coefficient, ideal for precision applications. All ADR02 variants are ROHS3 compliant with MSL rating of 1 (Unlimited).

For cost-optimized applications with relaxed tolerance requirements:

REF02CESA+ and REF02CESA+T deliver 21 mA output current with ±1% tolerance. These parts are suitable for applications where tighter tolerance is not critical. REF02CESA+ operates across -40°C to 85°C in tube packaging (3,704 units in stock), while REF02CESA+T provides cut tape and Digi-Reel packaging (1,430 units in stock).

All recommended substitutes maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original part.

Frequently Asked Questions (FAQ)

Q: Can ADR02 series parts with 10 mA output current replace the REF02AU/2K5G4 in all applications?

A: ADR02 series substitution depends on circuit load requirements. The REF02AU/2K5G4 provides 21 mA maximum output current. If your application draws more than 10 mA from the reference output, ADR02 parts are not suitable. For applications drawing 10 mA or less, ADR02 parts offer superior performance with tighter tolerance and lower temperature coefficient.

Q: What is the difference between REF02CSZ and REF02CSA+ in terms of operating temperature?

A: REF02CSZ operates across -40°C to 85°C, matching the original REF02AU/2K5G4 temperature range. REF02CSA+ operates across 0°C to 70°C, a narrower range. For applications requiring full industrial temperature coverage, REF02CSZ is the appropriate choice.

Q: Are all substitute parts available in the same packaging options?

A: No. Packaging varies by part number. REF02CSZ and REF02CSA+ are available in tube packaging. REF02CSZ-REEL and REF02CSA+T are available in cut tape and Digi-Reel or tape and reel configurations. ADR02 parts are available in cut tape and Digi-Reel (ARZ-REEL variants) or tube (BRZ) packaging. Verify packaging availability against your assembly requirements.

Q: What is the significance of MSL rating differences between the original part and substitutes?

A: The REF02AU/2K5G4 has MSL rating 3 (168 hours), requiring moisture bake-out before reflow soldering if exposed to humidity. All substitute parts have MSL rating 1 (Unlimited), eliminating moisture sensitivity concerns and simplifying handling and storage procedures.

Q: Can I use ADR02BRZ instead of ADR02ARZ-REEL if I need the same electrical performance?

A: ADR02BRZ and ADR02ARZ-REEL have identical electrical specifications (±0.1% tolerance, 10 ppm/°C temperature coefficient, 10 mA output current). The difference is packaging: ADR02BRZ is supplied in tube packaging, while ADR02ARZ-REEL is supplied in cut tape and Digi-Reel format. Select based on your assembly process requirements.

Q: What is the input voltage range compatibility for substitutes?

A: The original REF02AU/2K5G4 accepts 8V to 40V input. REF02CSZ and REF02CSA+ accept 8V to 36V, which covers most applications but has a 4V lower maximum. ADR02 series accepts 7V to 36V. If your circuit supplies above 36V, verify the substitute part's input range before selection.

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