AS13985H12-T Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The AS13985H12-T is a linear voltage regulator IC manufactured by ams-OSRAM USA INC., designed to deliver a fixed 1.2V output at 150mA in a surface-mount SOT-23-5 package. This device functions as a positive fixed output regulator with integrated enable control and thermal/overcurrent protection features.

The AS13985H12-T is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this regulator topology.

Substiute Parts

AS13985H12-T

ams-OSRAM USA INC.In Stock: 1190AS13985H12-T Datasheet

Current PartRFQ

LD39015M12R

STMicroelectronicsIn Stock: 1850LD39015M12R Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AS13985H12-T is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Fixed output voltage: 1.2V
• Output current rating: 150mA minimum
• Input voltage maximum: 5.5V
• Package type: SOT-23-5 (SC-74A)
• Output configuration: Positive fixed
• Control features: Enable function
• Protection: Over current and over temperature protection
• Operating temperature range: -40°C to +125°C
• Mounting: Surface mount

The LD39015M12R from STMicroelectronics meets all mandatory electrical and mechanical parameters required for direct substitution. Both devices share identical output voltage, current rating, input voltage specification, package footprint, and functional feature set.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: LD39015M12R (STMicroelectronics)

The LD39015M12R is the direct functional equivalent for the obsolete AS13985H12-T. Both devices are electrically and mechanically interchangeable for applications requiring a 1.2V, 150mA linear regulator in SOT-23-5 packaging.

Compliance and Availability Advantages:

The LD39015M12R carries active product status from STMicroelectronics, ensuring ongoing availability and supply chain support. The substitute part is ROHS3 compliant and carries REACH unaffected status, matching the regulatory profile of the original part.

Performance Characteristics:

The LD39015M12R demonstrates improved performance metrics compared to the AS13985H12-T in three areas: quiescent current (50 µA versus 130 µA), power supply rejection ratio (65dB–62dB versus 60dB–55dB), and moisture sensitivity level (MSL 1 unlimited versus MSL 3 at 168 hours). These improvements provide enhanced efficiency and reliability without compromising functional compatibility.

Selection Criteria:

Selection of the LD39015M12R is based on parameter equivalence, active product status, regulatory compliance, and superior performance characteristics. No design modifications are required for direct substitution in existing AS13985H12-T applications.

Frequently Asked Questions (FAQ)

Q: Can the LD39015M12R be used as a direct replacement for the AS13985H12-T without circuit modifications?

A: Yes. The LD39015M12R is a direct functional equivalent. Both devices share identical output voltage (1.2V), output current (150mA), input voltage rating (5.5V maximum), package type (SOT-23-5), and control/protection features. No circuit modifications are required.

Q: What is the significance of the AS13985H12-T being classified as obsolete?

A: Obsolete status indicates the part is no longer manufactured by ams-OSRAM USA INC. and existing inventory will eventually deplete. The LD39015M12R, with active product status from STMicroelectronics, provides a supported alternative for new designs and ongoing production.

Q: Are the package footprints identical between AS13985H12-T and LD39015M12R?

A: Yes. Both devices use the SOT-23-5 package type (SC-74A, SOT-753 designation). PCB footprints are identical, and no layout modifications are necessary.

Q: What are the key performance differences between these two regulators?

A: The LD39015M12R offers three measurable improvements: lower quiescent current (50 µA versus 130 µA), higher power supply rejection ratio (65dB–62dB versus 60dB–55dB at 1kHz–10kHz), and superior moisture sensitivity rating (MSL 1 unlimited versus MSL 3 at 168 hours). These differences enhance efficiency and reliability in production environments.

Q: Is the LD39015M12R compliant with current regulatory standards?

A: Yes. The LD39015M12R is ROHS3 compliant and carries REACH unaffected status, meeting current regulatory requirements for electronic components in most markets.

Q: What is the dropout voltage specification for the LD39015M12R?

A: The LD39015M12R has a maximum dropout voltage of 0.1V at 100mA output current. The AS13985H12-T dropout voltage specification is not provided in available documentation.

Q: Are there any supply chain considerations when transitioning from AS13985H12-T to LD39015M12R?

A: The LD39015M12R is available in active production with 1823 pieces in stock. The AS13985H12-T, with obsolete status, has limited remaining inventory (1096 pieces). Transition to the LD39015M12R is recommended to ensure long-term supply continuity.