REF02BUE4 Equivalent & Substitute Parts

Part Overview

The REF02BUE4 is a series voltage reference IC manufactured by Texas Instruments, designed to provide a fixed 5V output with ±0.2% tolerance. This device operates across an input voltage range of 8V to 40V and delivers up to 21 mA output current, making it suitable for precision analog applications requiring stable reference voltages. The REF02BUE4 is classified as obsolete, necessitating identification of active equivalent and substitute parts for new designs and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	REF02BUE4
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Voltage (Fixed)	5V
Output Current	21 mA
Tolerance	±0.2%
Temperature Coefficient	10 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)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the REF02BUE4 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Output voltage: 5V fixed
Package type: 8-SOIC form factor
Mounting type: Surface mount
RoHS3 compliance

Performance Criteria for Direct Substitution:

Output current capability: minimum 21 mA
Tolerance: ±0.2% or better
Temperature coefficient: 10 ppm/°C or lower
Input voltage range: must encompass 8V ~ 40V
Operating temperature: -40°C ~ 85°C minimum

Acceptable Substitution Variants: Parts meeting the above electrical and mechanical requirements are grouped into two categories: direct replacements (REF02 series from Texas Instruments and Analog Devices) and enhanced-performance alternatives (ADR02 series with superior tolerance and temperature stability).

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Tolerance	Temp Coeff	Input Range	Operating Temp	Package	Status
REF02BUE4	Texas Instruments	5V	21 mA	±0.2%	10 ppm/°C	8V ~ 40V	-40°C ~ 85°C	8-SOIC	Obsolete
REF02BU	Texas Instruments	5V	21 mA	±0.2%	10 ppm/°C	8V ~ 40V	-40°C ~ 85°C	8-SOIC	Active
ADR02ARZ	Analog Devices Inc.	5V	10 mA	±0.1%	10 ppm/°C	7V ~ 36V	-40°C ~ 125°C	8-SOIC	Active
ADR02ARZ-REEL	Analog Devices Inc.	5V	10 mA	±0.1%	10 ppm/°C	7V ~ 36V	-40°C ~ 125°C	8-SOIC	Active
ADR02ARZ-REEL7	Analog Devices Inc.	5V	10 mA	±0.1%	10 ppm/°C	7V ~ 36V	-40°C ~ 125°C	8-SOIC	Active
ADR02BRZ	Analog Devices Inc.	5V	10 mA	±0.06%	3 ppm/°C	7V ~ 36V	-40°C ~ 125°C	8-SOIC	Active
ADR02BRZ-REEL7	Analog Devices Inc.	5V	10 mA	±0.06%	3 ppm/°C	7V ~ 36V	-40°C ~ 125°C	8-SOIC	Active
REF02CESA+	Analog Devices Inc./Maxim Integrated	5V	21 mA	±1%	65 ppm/°C	8V ~ 30V	-40°C ~ 85°C	8-SOIC	Active
REF02CESA+T	Analog Devices Inc./Maxim Integrated	5V	21 mA	±1%	65 ppm/°C	8V ~ 30V	-40°C ~ 85°C	8-SOIC	Active
REF02CSA+	Analog Devices Inc./Maxim Integrated	5V	21 mA	±1%	65 ppm/°C	8V ~ 30V	0°C ~ 70°C	8-SOIC	Active
REF02CSA+T	Analog Devices Inc./Maxim Integrated	5V	21 mA	±1%	65 ppm/°C	8V ~ 30V	0°C ~ 70°C	8-SOIC	Active

Engineering Selection Recommendations

Primary Recommendation: REF02BU

The REF02BU is the direct active equivalent to the REF02BUE4. It maintains identical electrical specifications (5V output, 21 mA current, ±0.2% tolerance, 10 ppm/°C temperature coefficient) and operates across the same input voltage range (8V ~ 40V) and temperature range (-40°C ~ 85°C). Both devices are packaged in 8-SOIC form factor and comply with ROHS3 standards. The REF02BU is currently in active production status with substantial inventory availability (9047 pcs), making it the optimal choice for direct replacement in existing designs.

Secondary Recommendation: ADR02 Series (ADR02ARZ, ADR02ARZ-REEL, ADR02ARZ-REEL7, ADR02BRZ, ADR02BRZ-REEL7)

The ADR02 series from Analog Devices Inc. offers enhanced performance characteristics suitable for applications requiring superior precision. The ADR02ARZ variants provide ±0.1% tolerance with identical 10 ppm/°C temperature coefficient, while the ADR02BRZ variants deliver ±0.06% tolerance with improved 3 ppm/°C temperature coefficient. These devices operate across 7V ~ 36V input range and -40°C ~ 125°C temperature range, providing extended operating temperature capability. However, output current is limited to 10 mA, which is insufficient for applications requiring the full 21 mA output of the REF02BUE4. The ADR02 series is suitable only when output current requirements do not exceed 10 mA.

Alternative Consideration: REF02CESA+ Series

The REF02CESA+ variants maintain the 21 mA output current capability and 8-SOIC package compatibility. However, tolerance is degraded to ±1% with temperature coefficient of 65 ppm/°C, and input voltage range is reduced to 8V ~ 30V. These parts are suitable only for applications where the original ±0.2% tolerance and 10 ppm/°C temperature coefficient are not critical requirements.

Frequently Asked Questions (FAQ)

Q: Can REF02BU be used as a direct replacement for REF02BUE4?

A: Yes. The REF02BU is electrically and mechanically identical to the REF02BUE4, with the same 5V output, 21 mA current capability, ±0.2% tolerance, and 8-SOIC package. The primary difference is product status: REF02BUE4 is obsolete while REF02BU is active production.

Q: Why do ADR02 parts show lower output current (10 mA vs 21 mA)?

A: The ADR02 series is designed with different internal architecture optimized for precision and temperature stability rather than high output current. Applications requiring 21 mA output current must use REF02BU or REF02CESA+ variants.

Q: What is the difference between ADR02ARZ and ADR02BRZ?

A: Both are 8-SOIC packaged 5V references with 10 mA output. The ADR02ARZ provides ±0.1% tolerance with 10 ppm/°C temperature coefficient. The ADR02BRZ offers superior ±0.06% tolerance with improved 3 ppm/°C temperature coefficient. Selection depends on precision requirements of the application.

Q: Are packaging variants (REEL, REEL7, Tube, Tape & Reel) electrically equivalent?

A: Yes. Packaging designations (REEL, REEL7, Tube, Tape & Reel, Cut Tape) indicate only the physical delivery format and quantity per reel. Electrical specifications and performance are identical across all packaging variants of the same base part number.

Q: Can REF02CESA+ be used if tolerance requirements are relaxed?

A: REF02CESA+ is suitable only for applications where ±1% tolerance and 65 ppm/°C temperature coefficient are acceptable. Input voltage range is also reduced to 8V ~ 30V compared to the original 8V ~ 40V. Verify application requirements before selection.

Q: What is the MSL (Moisture Sensitivity Level) difference between parts?

A: REF02BU and ADR02 series have MSL 1 (unlimited shelf life), while REF02BUE4 has MSL 3 (168 hours). MSL 1 provides superior moisture protection during storage and handling. REF02CESA+ variants have MSL 1, offering better moisture resistance than the original part.

Q: Is the extended temperature range of ADR02 (-40°C ~ 125°C) beneficial for all applications?

A: Extended temperature range is beneficial only for applications operating above 85°C. For standard -40°C ~ 85°C applications, the standard REF02BU is sufficient and more cost-effective.

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