REF02BUG4 Equivalent & Substitute Parts

Part Overview

The REF02BUG4 is a series voltage reference IC manufactured by Texas Instruments, delivering a fixed 5V output with ±0.2% tolerance in an 8-SOIC surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The REF02BUG4 operates across an input voltage range of 8V to 40V with a maximum output current of 21 mA and a temperature coefficient of 10 ppm/°C. It is RoHS3 compliant with MSL-3 moisture sensitivity rating.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	5V
Output Tolerance	±0.2%
Output Current	21 mA
Temperature Coefficient	10 ppm/°C
Input Voltage Range	8V ~ 40V
Supply Current	1.4 mA
Operating Temperature	-40°C ~ 85°C
Package	8-SOIC (0.154", 3.90mm Width)
Noise (0.1Hz to 10Hz)	4 µVp-p
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the REF02BUG4 is determined by the following critical parameters:

Output Voltage: Must be fixed at 5V
Package Type: Must be 8-SOIC (0.154", 3.90mm Width)
Mounting Type: Must be Surface Mount
Output Tolerance: ±0.2% or better
Output Current: Minimum 21 mA capability
Input Voltage Range: Must accommodate 8V ~ 40V operation
Temperature Range: Must support -40°C ~ 85°C minimum
Compliance: RoHS3 compliant

Substitute parts are grouped into two categories:

Category 1: Direct Equivalents (Texas Instruments REF02 Series)

REF02BU: Active product status, identical electrical specifications, tube packaging
REF02CSZ-REEL, REF02CSZ-REEL7, REF02CSA+: Alternative packaging configurations of compatible REF02 series devices

Category 2: Cross-Manufacturer Alternatives (Analog Devices ADR02 Series)

ADR02ARZ, ADR02ARZ-REEL, ADR02ARZ-REEL7: Enhanced tolerance (±0.1%), reduced output current (10 mA), improved temperature range (-40°C ~ 125°C)
ADR02BRZ, ADR02BRZ-REEL7: Superior tolerance (±0.06%), reduced temperature coefficient (3 ppm/°C), reduced output current (10 mA)

Category 3: Tolerance-Relaxed Alternatives (REF02 Series, ±1%)

REF02CESA+, REF02CESA+T, REF02CSA+, REF02CSA+T: Wider tolerance (±1%), higher temperature coefficient (65 ppm/°C), suitable for applications with relaxed accuracy requirements

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Tolerance	Output Current	Temp Coeff	Input Range	Op Temp	Package	Status
REF02BUG4	Texas Instruments	5V	±0.2%	21 mA	10 ppm/°C	8V ~ 40V	-40°C ~ 85°C	8-SOIC	Obsolete
REF02BU	Texas Instruments	5V	±0.2%	21 mA	10 ppm/°C	8V ~ 40V	-40°C ~ 85°C	8-SOIC	Active
ADR02ARZ	Analog Devices	5V	±0.1%	10 mA	10 ppm/°C	7V ~ 36V	-40°C ~ 125°C	8-SOIC	Active
ADR02ARZ-REEL	Analog Devices	5V	±0.1%	10 mA	10 ppm/°C	7V ~ 36V	-40°C ~ 125°C	8-SOIC	Active
ADR02ARZ-REEL7	Analog Devices	5V	±0.1%	10 mA	10 ppm/°C	7V ~ 36V	-40°C ~ 125°C	8-SOIC	Active
ADR02BRZ	Analog Devices	5V	±0.06%	10 mA	3 ppm/°C	7V ~ 36V	-40°C ~ 125°C	8-SOIC	Active
ADR02BRZ-REEL7	Analog Devices	5V	±0.06%	10 mA	3 ppm/°C	7V ~ 36V	-40°C ~ 125°C	8-SOIC	Active
REF02CESA+	Analog Devices/Maxim	5V	±1%	21 mA	65 ppm/°C	8V ~ 30V	-40°C ~ 85°C	8-SOIC	Active
REF02CESA+T	Analog Devices/Maxim	5V	±1%	21 mA	65 ppm/°C	8V ~ 30V	-40°C ~ 85°C	8-SOIC	Active
REF02CSA+	Analog Devices/Maxim	5V	±1%	21 mA	65 ppm/°C	8V ~ 30V	0°C ~ 70°C	8-SOIC	Active
REF02CSA+T	Analog Devices/Maxim	5V	±1%	21 mA	65 ppm/°C	8V ~ 30V	0°C ~ 70°C	8-SOIC	Active

Engineering Selection Recommendations

Primary Recommendation: REF02BU

REF02BU is the direct active equivalent to the obsolete REF02BUG4. It maintains identical electrical specifications (±0.2% tolerance, 21 mA output current, 10 ppm/°C temperature coefficient) and operates across the same input voltage range (8V ~ 40V) and temperature range (-40°C ~ 85°C). Both parts are RoHS3 compliant. The only difference is packaging format (tube versus unspecified for the original). This part is currently in active production status with 9,047 units in stock.

Secondary Recommendation: ADR02ARZ-REEL7

For applications requiring enhanced accuracy and extended temperature range, ADR02ARZ-REEL7 from Analog Devices provides ±0.1% tolerance and operates to -40°C ~ 125°C. However, this part delivers only 10 mA output current versus the 21 mA of the REF02BUG4. This substitution is valid only if the application's output current requirement does not exceed 10 mA. The part is RoHS3 compliant with MSL-1 rating (superior moisture handling). 41,509 units are in stock.

Tertiary Recommendation: ADR02BRZ-REEL7

For precision applications requiring superior temperature stability, ADR02BRZ-REEL7 offers ±0.06% tolerance and 3 ppm/°C temperature coefficient. Like the ADR02ARZ series, output current is limited to 10 mA. This part is suitable only for low-current applications. RoHS3 compliant with MSL-1 rating. 3,207 units are in stock.

Alternative for Relaxed Tolerance Applications: REF02CSA+

If the application can tolerate ±1% accuracy, REF02CSA+ maintains the 21 mA output current capability and 8-SOIC package. This part operates across 0°C ~ 70°C (narrower than the original -40°C ~ 85°C range) and has a higher temperature coefficient (65 ppm/°C). Input voltage range is limited to 8V ~ 30V. 75,450 units are in stock.

Frequently Asked Questions (FAQ)

Q: Can I use ADR02ARZ instead of REF02BUG4 if my circuit only draws 10 mA?

A: Yes, if your application's maximum output current requirement does not exceed 10 mA. ADR02ARZ provides superior tolerance (±0.1% versus ±0.2%) and extended operating temperature range (-40°C ~ 125°C). The 8-SOIC package is identical. Verify that your input voltage remains within 7V ~ 36V (slightly narrower than the original 8V ~ 40V specification).

Q: What is the difference between REF02BU and REF02BUG4?

A: REF02BU is the active production equivalent of the obsolete REF02BUG4. Electrical specifications are identical. The primary difference is product status: REF02BUG4 is obsolete while REF02BU is actively manufactured. Packaging format may differ (tube for REF02BU).

Q: Can I use REF02CSA+ as a direct replacement?

A: REF02CSA+ is a functional substitute only if your application tolerates ±1% output voltage accuracy (versus ±0.2% for the original). It maintains 21 mA output current and 8-SOIC packaging. However, the operating temperature range is narrower (0°C ~ 70°C versus -40°C ~ 85°C) and input voltage range is reduced (8V ~ 30V versus 8V ~ 40V). Use only if these specifications align with your application requirements.

Q: What does MSL-1 versus MSL-3 mean for my assembly process?

A: MSL (Moisture Sensitivity Level) indicates how long a component can be exposed to ambient conditions before soldering. MSL-3 (REF02BUG4) allows 168 hours of exposure. MSL-1 (ADR02 series) allows unlimited exposure. If your assembly process involves extended storage or delayed soldering, MSL-1 rated parts (ADR02 series) provide greater flexibility.

Q: Why do some substitute parts have lower output current ratings?

A: The ADR02 series from Analog Devices is optimized for precision voltage reference applications where output current is typically limited by design. These parts deliver 10 mA maximum, which is sufficient for most reference applications but insufficient for applications requiring 21 mA output. Verify your circuit's actual current draw before selecting a lower-rated substitute.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All parts listed—REF02BU, ADR02ARZ, ADR02ARZ-REEL, ADR02ARZ-REEL7, ADR02BRZ, ADR02BRZ-REEL7, REF02CESA+, REF02CESA+T, REF02CSA+, and REF02CSA+T—are RoHS3 compliant and REACH unaffected.

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