LD2985AM15R Equivalent & Substitute Parts

Part Overview

The LD2985AM15R is a linear voltage regulator IC manufactured by STMicroelectronics, designed to deliver a fixed 1.5V 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 protection features including over-current and over-temperature monitoring.

The LD2985AM15R is classified as obsolete. Equivalent and substitute parts are necessary to support ongoing production requirements, maintenance operations, and design continuity where this component is specified in existing applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	LD2985AM15R
Manufacturer	STMicroelectronics
Category	Power Management (PMIC)
Output Voltage (Fixed)	1.5V
Output Current	150mA
Input Voltage (Max)	16V
Dropout Voltage (Max)	0.575V @ 150mA
Quiescent Current	150 µA
Package Type	SOT-23-5 (SC-74A)
Operating Temperature Range	-40°C to 125°C
Control Features	Enable
Protection Features	Over Current, Over Temperature
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the LD2985AM15R are selected based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

Output voltage: 1.5V fixed
Output current capability: minimum 150mA
Package type: SOT-23-5 surface mount
Input voltage rating: minimum 16V
Operating temperature range: -40°C to 125°C
Output configuration: Positive fixed regulator
Control features: Enable function
Protection: Over-current and over-temperature protection

Substitute parts are grouped into two categories:

Category A - Direct Current Equivalents (150mA Output): Parts with 150mA output current rating matching the original specification. These include the MIC5247-1.5YM5-TR from Microchip Technology.

Category B - Higher Current Capacity Substitutes (250mA+ Output): Parts with output current ratings exceeding 150mA, providing enhanced current delivery capability while maintaining all other critical parameters. These include LP2992 series variants from National Semiconductor and Texas Instruments, and the MAX8887EZK15+T from Analog Devices Inc./Maxim Integrated.

Category C - Lower Current Capacity Alternatives (100mA Output): Parts with 100mA output current rating, suitable for applications with reduced current requirements. These include LT1761 series variants from Analog Devices Inc.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage (Max)	Quiescent Current	Package	Operating Temp	Product Status
LD2985AM15R	STMicroelectronics	1.5V	150mA	16V	0.575V @ 150mA	150 µA	SOT-23-5	-40°C to 125°C	Obsolete
MIC5247-1.5YM5-TR	Microchip Technology	1.5V	150mA	6V	0.15V @ 150mA	150 µA	SOT-23-5	-40°C to 125°C	Active
LP2992AIM5-1.5/NOPB	National Semiconductor	1.5V	250mA	16V	0.85V @ 250mA	95 µA	SOT-23-5	-40°C to 125°C	Active
LP2992AIM5X-1.5/NOPB	National Semiconductor	1.5V	250mA	16V	0.85V @ 250mA	95 µA	SOT-23-5	-40°C to 125°C	Active
LP2992IM5-1.5/NOPB	Texas Instruments	1.5V	250mA	16V	0.85V @ 250mA	95 µA	SOT-23-5	-40°C to 125°C	Obsolete
LP2992IM5X-1.5/NOPB	Texas Instruments	1.5V	250mA	16V	0.85V @ 250mA	95 µA	SOT-23-5	-40°C to 125°C	Last Time Buy
LT1761ES5-1.5#TRMPBF	Analog Devices Inc.	1.5V	100mA	20V	0.45V @ 100mA	Not specified	TSOT-23-5	-40°C to 125°C	Active
LT1761ES5-1.5#TRPBF	Analog Devices Inc.	1.5V	100mA	20V	0.45V @ 100mA	Not specified	TSOT-23-5	-40°C to 125°C	Active
LT1761IS5-1.5#TRMPBF	Analog Devices Inc.	1.5V	100mA	20V	0.45V @ 100mA	Not specified	TSOT-23-5	-40°C to 125°C	Active
LT1761IS5-1.5#TRPBF	Analog Devices Inc.	1.5V	100mA	20V	0.45V @ 100mA	Not specified	TSOT-23-5	-40°C to 125°C	Active
MAX8887EZK15+T	Analog Devices Inc./Maxim Integrated	1.5V	300mA	5.5V	Not specified	100 µA	TSOT-23-5	-40°C to 85°C	Active

Engineering Selection Recommendations

For Direct Replacement (Matching 150mA Output Current):

The MIC5247-1.5YM5-TR from Microchip Technology is the primary direct equivalent. This part maintains the 150mA output current specification and operates across the full -40°C to 125°C temperature range. The MIC5247-1.5YM5-TR is classified as Active product status, ensuring long-term availability and supply continuity. This device is ROHS3 compliant and carries REACH Unaffected status, meeting current regulatory requirements.

For Higher Current Applications (250mA Output Current):

The LP2992 series from National Semiconductor (LP2992AIM5-1.5/NOPB and LP2992AIM5X-1.5/NOPB) provides 250mA output current capability while maintaining 1.5V fixed output and 16V maximum input voltage rating. Both variants are classified as Active, ensuring availability. The LP2992IM5-1.5/NOPB and LP2992IM5X-1.5/NOPB from Texas Instruments offer identical electrical specifications but carry Obsolete and Last Time Buy status respectively, limiting their suitability for new designs.

For Enhanced Current Delivery (300mA Output Current):

The MAX8887EZK15+T from Analog Devices Inc./Maxim Integrated delivers 300mA output current in an Active product status. This device operates at a reduced maximum input voltage of 5.5V compared to the original 16V specification. The operating temperature range is limited to -40°C to 85°C, which is narrower than the original -40°C to 125°C range. Selection of this part requires verification that the application input voltage does not exceed 5.5V and that the reduced upper temperature limit is acceptable.

For Lower Current Requirements (100mA Output Current):

The LT1761 series from Analog Devices Inc. (LT1761ES5-1.5#TRMPBF, LT1761ES5-1.5#TRPBF, LT1761IS5-1.5#TRMPBF, and LT1761IS5-1.5#TRPBF) provides 100mA output current with a higher maximum input voltage rating of 20V. All variants are classified as Active. These parts are suitable for applications where the required output current does not exceed 100mA.

Compliance and Certification:

All recommended substitute parts are ROHS3 compliant and carry REACH Unaffected status, meeting current environmental and regulatory requirements. All parts operate across the -40°C to 125°C temperature range except the MAX8887EZK15+T, which is limited to -40°C to 85°C.

Frequently Asked Questions (FAQ)

Q: Can the LP2992 series parts directly replace the LD2985AM15R?

A: The LP2992 series parts are functionally compatible substitutes. They maintain the 1.5V fixed output voltage, 16V maximum input voltage, and SOT-23-5 package. The LP2992 series provides higher output current (250mA versus 150mA), which is a superset capability. Applications designed for 150mA operation will function correctly with LP2992 substitutes. The LP2992AIM5-1.5/NOPB and LP2992AIM5X-1.5/NOPB variants are recommended due to their Active product status.

Q: What is the difference between the LT1761 variants (ES5 versus IS5)?

A: The LT1761ES5 and LT1761IS5 variants differ in their temperature grade classification. Both operate across the -40°C to 125°C range and deliver 100mA output current at 1.5V. The primary difference lies in the packaging designation suffix (#TRMPBF versus #TRPBF), which indicates different tape and reel configurations. Both are functionally equivalent for circuit operation.

Q: Why does the MAX8887EZK15+T have a lower maximum input voltage (5.5V) compared to the original LD2985AM15R (16V)?

A: The MAX8887EZK15+T is designed for lower input voltage applications, typically in battery-powered or low-voltage supply systems. This device is not suitable for applications requiring the full 16V input voltage capability of the LD2985AM15R. Selection of this part requires confirmation that the application input voltage remains below 5.5V.

Q: Is the MIC5247-1.5YM5-TR a true 1:1 replacement for the LD2985AM15R?

A: The MIC5247-1.5YM5-TR is the closest direct equivalent, matching the 150mA output current specification and maintaining all critical electrical parameters. Both devices operate across -40°C to 125°C and are housed in SOT-23-5 packages. The MIC5247-1.5YM5-TR is classified as Active, providing superior long-term availability compared to the obsolete LD2985AM15R.

Q: Can I use a 250mA-rated regulator in place of a 150mA-rated regulator?

A: Yes. A regulator with higher current rating is a valid substitute for applications requiring lower current. The LP2992 series (250mA) can be used in circuits designed for 150mA operation. The higher current capability does not negatively impact circuit performance; it simply provides additional headroom for current delivery.

Q: What is the significance of "Last Time Buy" status for the LP2992IM5X-1.5/NOPB?

A: Last Time Buy status indicates that the manufacturer has announced the end of production for this part. Existing inventory may be available for a limited time, but no new production runs are planned. For new designs or long-term production requirements, Active status parts such as LP2992AIM5-1.5/NOPB or LP2992AIM5X-1.5/NOPB are recommended.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed in this reference are ROHS3 compliant and carry REACH Unaffected status, meeting current environmental and regulatory requirements for electronic components.

Q: What is the difference between SOT-23-5 and TSOT-23-5 packages?

A: TSOT-23-5 is a thin variant of the SOT-23-5 package. Both are mechanically and electrically compatible for PCB mounting and circuit operation. The primary difference is the reduced package height of the TSOT variant. Parts specified with either package designation can be used interchangeably in applications where the reduced height does not create mechanical constraints.

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