ZXRE125FRSTOB Equivalent & Substitute Parts

Part Overview

The ZXRE125FRSTOB is a shunt voltage reference IC manufactured by Diodes Incorporated, designed to provide a fixed 1.22V output with ±3% 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 product is currently obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity.

Substiute Parts

ZXRE125FRSTOB

Diodes IncorporatedIn Stock: 810ZXRE125FRSTOB Datasheet

Current PartRFQ

ZXRE125FFTA

Diodes IncorporatedIn Stock: 5006ZXRE125FFTA Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ZXRE125FRSTOB is determined by electrical and mechanical compatibility across the following critical parameters:

• Fixed output voltage of 1.22V
• Output current capability of 20 mA
• Tolerance specification of ±3%
• Temperature coefficient of 75 ppm/°C
• Noise performance of 60 µVrms (10Hz to 10kHz)
• Cathode current of 8 µA
• Operating temperature range of -40°C to 85°C
• Shunt reference type and fixed output configuration

The ZXRE125FFTA qualifies as a direct electrical substitute, maintaining identical electrical specifications. However, it differs in mounting technology (surface mount SOT-23-3 versus through-hole E-Line), which requires PCB design modification.

Parameter Comparison

Engineering Selection Recommendations

The ZXRE125FFTA is the manufacturer-recommended substitute for the obsolete ZXRE125FRSTOB. Both components maintain identical electrical specifications and regulatory compliance (ROHS3, REACH Unaffected, EAR99 classification).

The primary consideration for selection is the package transition from through-hole E-Line to surface-mount SOT-23-3. This substitution is appropriate for new designs or PCB revisions that accommodate surface-mount technology. For applications requiring through-hole mounting without PCB redesign, alternative shunt reference ICs with identical electrical parameters in E-Line packaging from other manufacturers may be necessary.

The ZXRE125FFTA offers the advantage of active product status with higher inventory availability (4905 pcs versus 799 pcs for the obsolete main part), supporting long-term supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can the ZXRE125FFTA be used as a direct pin-for-pin replacement for the ZXRE125FRSTOB?

A: No. While electrically equivalent, the ZXRE125FFTA uses SOT-23-3 surface-mount packaging versus the E-Line through-hole package of the ZXRE125FRSTOB. Pin-for-pin compatibility does not apply due to different mounting technologies and physical footprints.

Q: What are the key electrical parameters that define substitution eligibility?

A: Substitution is determined by matching: fixed output voltage (1.22V), output current (20 mA), tolerance (±3%), temperature coefficient (75 ppm/°C), noise performance (60 µVrms at 10Hz to 10kHz), cathode current (8 µA), and operating temperature range (-40°C to 85°C).

Q: Are there compliance differences between the main part and substitute?

A: No. Both components are ROHS3 compliant, REACH unaffected, and classified as EAR99 for export control purposes.

Q: What design considerations apply when transitioning from ZXRE125FRSTOB to ZXRE125FFTA?

A: PCB layout modification is required to accommodate the SOT-23-3 surface-mount footprint. Trace routing, thermal management, and solder reflow processes differ from through-hole assembly. Component placement density may improve due to the smaller package size.

Q: Is the ZXRE125FFTA suitable for all applications currently using the ZXRE125FRSTOB?

A: Electrical performance is identical. Suitability depends on PCB design flexibility and manufacturing capability to support surface-mount assembly. Applications with fixed through-hole designs require alternative solutions.