ZTL431ACSTZ Equivalent & Substitute Parts

Part Overview

The ZTL431ACSTZ is a shunt voltage reference IC manufactured by Diodes Incorporated, designed for adjustable voltage regulation applications. This component provides a fixed 2.5V output with adjustable capability up to 20V, delivering 100mA output current with ±1% tolerance. The device is packaged in TO-92 through-hole configuration and is currently classified as obsolete. Due to its obsolete status and limited inventory availability (1020 pcs), identifying functionally equivalent substitute parts is essential for ongoing design support and production continuity.

Substiute Parts

ZTL431ACSTZ

Diodes IncorporatedIn Stock: 1111ZTL431ACSTZ Datasheet

Current PartRFQ

ZTL431AFTA

Diodes IncorporatedIn Stock: 23292ZTL431AFTA Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ZTL431ACSTZ is determined by electrical parameter equivalence across the following criteria:

• Reference type (Shunt)
• Output type (Adjustable)
• Voltage output range (2.5V minimum, 20V maximum)
• Current output capacity (100mA)
• Tolerance specification (±1%)
• Cathode current (600µA)
• Operating temperature range (-40°C ~ 125°C)
• Compliance certifications (ROHS3, REACH Unaffected)

The ZTL431AFTA meets all electrical and compliance requirements for direct substitution. The primary difference is packaging format: the main part uses through-hole TO-92 mounting, while the substitute uses surface-mount SOT-23-3 packaging. This distinction requires PCB layout modification but does not affect electrical performance or functional compatibility.

Parameter Comparison

Engineering Selection Recommendations

The ZTL431AFTA is the manufacturer-recommended substitute for the ZTL431ACSTZ. Both components share identical electrical specifications and compliance certifications. The ZTL431AFTA carries active product status with significantly higher inventory availability (23200 pcs), ensuring long-term supply chain reliability compared to the obsolete ZTL431ACSTZ.

Selection between these parts depends on PCB design constraints. The through-hole TO-92 package of the main part suits legacy designs and breadboard prototyping. The surface-mount SOT-23-3 package of the substitute supports modern high-density PCB layouts and automated assembly processes. Both packages deliver equivalent electrical performance and meet ROHS3 and REACH compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can ZTL431AFTA directly replace ZTL431ACSTZ without circuit modification?

A: Electrical substitution is direct. Pin functionality and electrical characteristics are identical. PCB layout modification is required due to package format differences (through-hole versus surface-mount).

Q: Are there any performance differences between the two parts?

A: No. Both components deliver identical voltage output range (2.5V to 20V), current capacity (100mA), tolerance (±1%), and operating temperature range (-40°C to 125°C).

Q: Why is the ZTL431ACSTZ classified as obsolete?

A: The manufacturer has transitioned production to the ZTL431AFTA surface-mount variant, which aligns with modern manufacturing standards and PCB assembly processes.

Q: What are the package compatibility considerations?

A: ZTL431ACSTZ uses TO-92-3 through-hole leads requiring drilled PCB holes and manual or wave soldering. ZTL431AFTA uses SOT-23-3 surface-mount pads compatible with reflow soldering and automated pick-and-place assembly.

Q: Are both parts RoHS and REACH compliant?

A: Yes. Both ZTL431ACSTZ and ZTL431AFTA are ROHS3 compliant and REACH unaffected, meeting environmental and regulatory requirements.

Q: Which part should be selected for new designs?

A: ZTL431AFTA is recommended for new designs due to active product status, higher inventory availability, and compatibility with contemporary PCB manufacturing processes.