ZXRE125DRSTOB Equivalent & Substitute Parts

Part Overview

The ZXRE125DRSTOB is a shunt voltage reference IC manufactured by Diodes Incorporated, designed to provide a fixed 1.22V output with ±1% tolerance. This component is classified as a Power Management (PMIC) device and is packaged in an E-Line (TO-92 compatible) through-hole configuration. The part is currently listed as obsolete, making identification of suitable substitutes essential for ongoing design support and production continuity.

Substiute Parts

ZXRE125DRSTOB

Diodes IncorporatedIn Stock: 985ZXRE125DRSTOB Datasheet

Current PartRFQ

ZXRE125DFTA

Diodes IncorporatedIn Stock: 9109ZXRE125DFTA Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ZXRE125DRSTOB is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Equivalence Criteria:

• Reference Type: Shunt (fixed output topology)
• Output Voltage: 1.22V (fixed)
• Output Current: 20 mA
• Tolerance: ±1%
• Temperature Coefficient: 75 ppm/°C
• Noise Performance: 60 µVrms (10Hz to 10kHz)
• Cathode Current: 8 µA
• Operating Temperature Range: -40°C to 85°C

Mechanical Compatibility Criteria:

• Base Product Number: ZXRE125 (same functional series)
• Manufacturer: Diodes Incorporated (same source)
• Compliance: ROHS3 Compliant, REACH Unaffected

The ZXRE125DFTA qualifies as a direct electrical substitute, with identical electrical specifications. The primary difference is packaging: the substitute uses surface-mount SOT-23-3 technology instead of through-hole E-Line mounting.

Parameter Comparison

Engineering Selection Recommendations

The ZXRE125DFTA is the manufacturer-recommended substitute for the obsolete ZXRE125DRSTOB. Both components share identical electrical specifications and are manufactured by Diodes Incorporated under the same base product number (ZXRE125).

Selection Basis:

The substitute maintains full electrical equivalence across all specified parameters: fixed 1.22V output, ±1% tolerance, 75 ppm/°C temperature coefficient, 60 µVrms noise performance, and 20 mA output current capability. Both parts operate across the -40°C to 85°C temperature range and comply with ROHS3 and REACH requirements.

The primary design consideration is packaging transition: the ZXRE125DFTA uses surface-mount SOT-23-3 technology, whereas the original uses through-hole E-Line mounting. This substitution is appropriate for new designs or production runs where PCB layout can accommodate surface-mount assembly. For applications requiring through-hole mounting, alternative through-hole shunt reference devices from the same manufacturer or other qualified sources must be evaluated.

The ZXRE125DFTA is currently in active production status with higher inventory availability (9080 pcs), ensuring supply chain continuity compared to the obsolete original part.

Frequently Asked Questions (FAQ)

Q: Can the ZXRE125DFTA be used as a direct replacement for the ZXRE125DRSTOB?

A: Electrically, yes. Both parts deliver identical voltage output (1.22V), tolerance (±1%), temperature coefficient (75 ppm/°C), and noise performance (60 µVrms). The substitution is valid from an electrical standpoint. However, the mounting method differs: ZXRE125DRSTOB is through-hole (E-Line), while ZXRE125DFTA is surface-mount (SOT-23-3). PCB layout and assembly process must accommodate this change.

Q: What are the key parameters that determine substitution eligibility?

A: Substitution eligibility is determined by: reference type (shunt), output voltage (1.22V fixed), output current (20 mA), tolerance (±1%), temperature coefficient (75 ppm/°C), noise specification (60 µVrms at 10Hz to 10kHz), cathode current (8 µA), and operating temperature range (-40°C to 85°C). All these parameters must match for electrical equivalence.

Q: Are there compliance differences between the two parts?

A: No. Both the ZXRE125DRSTOB and ZXRE125DFTA are ROHS3 compliant and REACH unaffected. Compliance certifications are identical.

Q: What is the impact of switching from through-hole to surface-mount packaging?

A: The packaging change affects PCB design, assembly process, and handling procedures. Through-hole components (E-Line) are inserted into drilled holes and soldered on the opposite side. Surface-mount components (SOT-23-3) are placed directly on the PCB surface and reflow soldered. This requires different assembly equipment and PCB layout considerations but does not affect electrical performance.

Q: Is the ZXRE125DFTA the only available substitute?

A: The ZXRE125DFTA is the manufacturer-recommended substitute from Diodes Incorporated. Other shunt voltage reference devices with matching electrical specifications (1.22V fixed output, ±1% tolerance, 75 ppm/°C temperature coefficient) from qualified manufacturers may also be evaluated, but the ZXRE125DFTA is the direct equivalent within the Diodes Incorporated product line.