ST2111FX Equivalent & Substitute Parts

Part Overview

The ST2111FX is an NPN bipolar junction transistor manufactured by STMicroelectronics, rated for 700 V collector-emitter breakdown voltage and 12 A maximum collector current in an ISOWATT-218FX through-hole package. This device is classified as obsolete, necessitating identification of active equivalent components for ongoing design support and procurement continuity. The ST2111FX delivers 65 W maximum power dissipation and operates at junction temperatures up to 150°C.

Substiute Parts

ST2111FX

STMicroelectronicsIn Stock: 871ST2111FX Datasheet

Current PartRFQ

ST1510FX

STMicroelectronicsIn Stock: 2194ST1510FX Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ST2111FX is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

• Transistor type must be NPN
• Collector-emitter breakdown voltage must equal or exceed 700 V
• Maximum collector current must equal or exceed 12 A
• Maximum power dissipation must equal or exceed 65 W
• Operating temperature range must support 150°C junction temperature

Mechanical Compatibility Criteria:

• Package type must be ISOWATT218FX
• Mounting configuration must be through-hole

Regulatory Compliance Criteria:

• RoHS3 compliance required
• REACH unaffected status required

The ST1510FX meets all substitution criteria and is classified as an active product, providing long-term availability and supply chain stability.

Parameter Comparison

Engineering Selection Recommendations

The ST1510FX is the direct substitute for the ST2111FX based on the following engineering factors:

Product Status: The ST1510FX is classified as active, ensuring continued availability and manufacturing support. The ST2111FX is obsolete, creating supply chain risk for new designs and ongoing production.

Regulatory Compliance: Both devices maintain ROHS3 compliance and REACH unaffected status, satisfying environmental and regulatory requirements for industrial and commercial applications.

Electrical Performance: The ST1510FX provides superior electrical characteristics within the same package envelope. The 750 V breakdown voltage rating exceeds the 700 V requirement, providing additional design margin. The lower saturation voltage (2V versus 3V) and higher DC current gain (6.5 versus 4.5) improve switching efficiency and reduce power dissipation in practical applications.

Mechanical Compatibility: Identical ISOWATT218FX package and through-hole mounting configuration ensure direct board-level substitution without layout modifications.

Moisture Sensitivity: The ST1510FX carries MSL 1 (unlimited moisture sensitivity level) compared to MSL 3 for the ST2111FX, indicating superior moisture resistance and reduced handling constraints during storage and assembly.

Frequently Asked Questions (FAQ)

Q: Can the ST1510FX directly replace the ST2111FX in existing designs?

A: Yes. The ST1510FX is electrically and mechanically compatible with the ST2111FX. Both devices share identical ISOWATT218FX packaging, through-hole mounting configuration, and maximum collector current rating of 12 A. The ST1510FX provides higher breakdown voltage (750 V versus 700 V) and improved saturation characteristics, making it suitable for direct substitution.

Q: What is the significance of the higher breakdown voltage in the ST1510FX?

A: The ST1510FX breakdown voltage of 750 V exceeds the ST2111FX specification of 700 V. This provides additional design margin and protection against voltage transients in high-voltage switching applications. The substitute part maintains full compatibility with circuits designed for 700 V operation.

Q: How do the saturation voltage differences affect circuit performance?

A: The ST1510FX exhibits lower saturation voltage (2V at specified conditions versus 3V for the ST2111FX). Lower saturation voltage reduces power dissipation during the on-state, improving overall circuit efficiency. This characteristic is beneficial in high-current switching applications.

Q: Are there any packaging or pinout differences between these devices?

A: No. Both the ST2111FX and ST1510FX use the ISOWATT218FX package with identical through-hole mounting configuration and pinout. No PCB modifications are required for substitution.

Q: What is the impact of the different moisture sensitivity levels?

A: The ST1510FX carries MSL 1 (unlimited moisture sensitivity level) compared to MSL 3 for the ST2111FX. MSL 1 indicates superior moisture resistance and eliminates the 168-hour floor life limitation associated with MSL 3 components. This reduces handling constraints and storage requirements during manufacturing and assembly.

Q: Why is the ST2111FX classified as obsolete?

A: The ST2111FX is no longer in active production by STMicroelectronics. Obsolete status indicates that new inventory production has ceased, though existing stock may remain available through authorized distributors. The ST1510FX is the active equivalent for ongoing design support and procurement.

Q: Are both devices RoHS3 compliant?

A: Yes. Both the ST2111FX and ST1510FX are ROHS3 compliant and REACH unaffected, satisfying environmental and regulatory requirements for industrial applications in regulated markets.