ZXRE125FRSTZ Equivalent & Substitute Parts

Part Overview

The ZXRE125FRSTZ 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 part is currently listed as obsolete, making identification of suitable substitutes essential for ongoing design support and production continuity.

Substiute Parts

ZXRE125FRSTZ

Diodes IncorporatedIn Stock: 728ZXRE125FRSTZ Datasheet

Current PartRFQ

ZXRE125FFTA

Diodes IncorporatedIn Stock: 5006ZXRE125FFTA Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ZXRE125FRSTZ is determined by strict equivalence across the following critical parameters:

• Reference Type: Shunt
• Output Type: Fixed
• Voltage - Output: 1.22V
• Current - Output: 20 mA
• Tolerance: ±3%
• Temperature Coefficient: 75 ppm/°C
• Noise - 10Hz to 10kHz: 60 µVrms
• Current - Cathode: 8 µA
• Operating Temperature Range: -40°C to 85°C
• Base Product Number: ZXRE125
• RoHS Status: ROHS3 Compliant

The ZXRE125FFTA qualifies as a direct functional equivalent, sharing identical electrical specifications. The primary difference is the mounting technology: the substitute transitions from through-hole (E-Line) to surface-mount (SOT-23-3) packaging. This change requires PCB layout modification but does not alter the core electrical performance or compliance profile.

Parameter Comparison

Engineering Selection Recommendations

The ZXRE125FFTA is the manufacturer-recommended substitute for the obsolete ZXRE125FRSTZ. Both components maintain identical electrical specifications and regulatory compliance (ROHS3, REACH Unaffected, EAR99 classification). The transition from through-hole to surface-mount packaging requires PCB redesign but does not compromise functional performance or environmental compliance.

Selection of the ZXRE125FFTA is appropriate for new designs and production continuity where surface-mount assembly is feasible. The active product status of the substitute ensures long-term availability and supply chain stability compared to the obsolete original part.

Frequently Asked Questions (FAQ)

Q: Can the ZXRE125FFTA be used as a direct replacement for the ZXRE125FRSTZ?

A: Yes, electrically. Both parts deliver identical voltage output (1.22V), current capability (20 mA), tolerance (±3%), temperature coefficient (75 ppm/°C), and noise performance (60 µVrms). The difference is packaging: the substitute uses SOT-23-3 surface-mount instead of E-Line through-hole. PCB layout modification is required.

Q: What is the primary reason for substitution?

A: The ZXRE125FRSTZ is obsolete. The ZXRE125FFTA is the active equivalent from the same manufacturer, ensuring continued availability and supply chain support.

Q: Are there compliance differences between the two parts?

A: No. Both parts are ROHS3 compliant, REACH unaffected, and classified as EAR99. Moisture sensitivity level is identical (MSL 1 - Unlimited).

Q: What PCB changes are necessary when switching from ZXRE125FRSTZ to ZXRE125FFTA?

A: The footprint changes from a three-pin through-hole E-Line package to a three-pin SOT-23-3 surface-mount package. Pin functionality remains the same. Trace routing and solder pad geometry must be updated accordingly.

Q: Is the ZXRE125FFTA available in higher volumes?

A: Yes. The substitute has significantly higher inventory availability (4905 pcs in stock versus 699 pcs for the obsolete part), supporting production scaling and long-term supply continuity.