UC3524D Equivalent & Substitute Parts

Part Overview

The UC3524D is an active Power Management IC (PMIC) manufactured by Texas Instruments, designed as a multi-topology DC-DC controller supporting Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, and Push-Pull topologies. The device outputs a transistor driver signal with dual outputs and operates across an 8V to 40V supply range with a maximum duty cycle of 45%. Currently in active production status with 2,816 units in stock, the UC3524D serves applications requiring step-up and step-up/step-down conversion with positive output configuration. Equivalent and substitute parts are identified based on matching electrical specifications, package compatibility, and functional topology support.

Substiute Parts

UC3524D

Texas InstrumentsIn Stock: 2847UC3524D Datasheet

Current PartRFQ

LM3524DM/NOPB

Texas InstrumentsIn Stock: 1408LM3524DM/NOPB Datasheet

MFR RecommendedRFQ

LM3524DMX/NOPB

Texas InstrumentsIn Stock: 2939LM3524DMX/NOPB Datasheet

MFR RecommendedRFQ

SG3524P

STMicroelectronicsIn Stock: 9360SG3524P Datasheet

DirectRFQ

SG3524P013TR

STMicroelectronicsIn Stock: 2731SG3524P013TR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the UC3524D is determined by the following critical parameters:

Primary Matching Criteria:

• Package / Case: 16-SOIC (0.154", 3.90mm Width) — ensures mechanical and electrical pin compatibility
• Voltage - Supply (Vcc/Vdd): 8V ~ 40V — maintains power supply compatibility
• Output Type: Transistor Driver — confirms functional output capability
• Mounting Type: Surface Mount — ensures assembly process compatibility
• RoHS Status: ROHS3 Compliant — meets environmental and regulatory requirements

Functional Topology Compatibility: Substitutes must support at least one topology from the UC3524D's supported set (Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull) or provide equivalent step-up/step-up-down functionality.

Identified Substitute Groups:

Group 1 — Texas Instruments LM3524 Series (MFR Recommended) LM3524DM/NOPB and LM3524DMX/NOPB share the same 16-SOIC package, identical supply voltage range (8V ~ 40V), and transistor driver output type. Both are active products with ROHS3 compliance. These parts support Buck and Boost topologies with positive or negative output configuration, providing functional equivalence for boost conversion applications.

Group 2 — STMicroelectronics SG3524 Series (Direct Substitutes) SG3524P and SG3524P013TR are direct functional equivalents manufactured by STMicroelectronics. Both maintain the 16-SOIC package, 8V ~ 40V supply voltage range, 300kHz switching frequency, and 45% maximum duty cycle. These parts support Flyback and Push-Pull topologies with positive output configuration and dual outputs, matching the UC3524D's core specifications.

Parameter Comparison

Engineering Selection Recommendations

Texas Instruments LM3524 Series (MFR Recommended Substitutes)

The LM3524DM/NOPB and LM3524DMX/NOPB are manufacturer-recommended alternatives. Both maintain full ROHS3 compliance and active production status. The LM3524DM/NOPB is packaged in Tube format with 1,300 units in stock, while the LM3524DMX/NOPB is supplied in Cut Tape (CT) & Digi-Reel® format with 2,883 units available. These parts support Buck and Boost topologies and feature an extended operating temperature range (0°C ~ 125°C TJ) compared to the UC3524D. The maximum duty cycle specification of 49% exceeds the UC3524D's 45%, and both offer improved moisture sensitivity (MSL 1, Unlimited) versus the UC3524D (MSL 2, 1 Year). Selection between these two depends on packaging requirements: Tube for standard component handling or Cut Tape & Digi-Reel® for automated assembly processes.

STMicroelectronics SG3524 Series (Direct Functional Equivalents)

The SG3524P and SG3524P013TR are direct functional equivalents with identical electrical specifications to the UC3524D, including 300kHz switching frequency, 45% maximum duty cycle, and dual output configuration. Both maintain ROHS3 compliance and active production status. The SG3524P is supplied in Tube format with 9,252 units in stock, while the SG3524P013TR is available in Cut Tape (CT) & Digi-Reel® format with 2,700 units. These parts support Flyback and Push-Pull topologies with positive output configuration. Moisture sensitivity is rated MSL 3 (168 Hours), which is more restrictive than the UC3524D. Selection depends on packaging preference and topology requirements within the Flyback and Push-Pull family.

Selection Criteria Summary

For applications requiring extended temperature operation and improved moisture handling, the LM3524 series is preferred. For applications requiring exact topology matching (Flyback, Push-Pull) and identical switching frequency, the SG3524 series is appropriate. All substitutes maintain the critical 16-SOIC package format and 8V ~ 40V supply voltage range, ensuring direct pin-compatible replacement capability.

Frequently Asked Questions (FAQ)

Q: Can the LM3524DM/NOPB replace the UC3524D in all applications?

A: The LM3524DM/NOPB is electrically compatible within the 8V ~ 40V supply range and shares the 16-SOIC package. However, it supports Buck and Boost topologies rather than the UC3524D's multi-topology support (Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull). Substitution is valid only for applications using Boost topology. The extended operating temperature range (0°C ~ 125°C) and improved moisture sensitivity (MSL 1) provide additional design margin.

Q: What is the difference between SG3524P and SG3524P013TR?

A: Both parts are functionally identical with matching electrical specifications, package format (16-SOIC), and topology support (Flyback, Push-Pull). The primary difference is packaging: SG3524P is supplied in Tube format, while SG3524P013TR is supplied in Cut Tape (CT) & Digi-Reel® format. Selection depends on assembly process requirements and component handling methodology.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, all identified substitutes (LM3524DM/NOPB, LM3524DMX/NOPB, SG3524P, and SG3524P013TR) are ROHS3 compliant, matching the UC3524D's environmental compliance status.

Q: What is the significance of the Moisture Sensitivity Level (MSL) difference?

A: The UC3524D is rated MSL 2 (1 Year), meaning the component must be used within one year of the moisture barrier bag opening. The LM3524 series is rated MSL 1 (Unlimited), requiring no time restriction after bag opening. The SG3524 series is rated MSL 3 (168 Hours), requiring use within 168 hours of bag opening. For applications with extended storage or delayed assembly, the LM3524 series offers superior handling flexibility.

Q: Can the LM3524DMX/NOPB be used interchangeably with LM3524DM/NOPB?

A: Yes, both parts are electrically and functionally identical. The difference is packaging format: LM3524DM/NOPB is supplied in Tube, while LM3524DMX/NOPB is supplied in Cut Tape (CT) & Digi-Reel®. Both are active products with identical specifications and can be selected based on assembly process requirements.

Q: What topologies does each substitute support?

A: The UC3524D supports Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, and Push-Pull topologies. The LM3524 series supports Buck and Boost topologies. The SG3524 series supports Flyback and Push-Pull topologies. Substitution must match the intended application topology.

Q: Are there any differences in control features between the UC3524D and its substitutes?

A: The UC3524D includes Current Limit, Enable, Frequency Control, and Ramp control features. The LM3524 series includes Current Limit, Enable, and Frequency Control. The SG3524 series includes Enable control only. Applications requiring Ramp control must use the UC3524D or verify compatibility with the selected substitute's control feature set.