FAN1587AMCX Equivalent & Substitute Parts

Part Overview

The FAN1587AMCX is a Power Management IC (PMIC) converter designed for Intel Pentium® GTL+ voltage regulation applications. Manufactured by onsemi, this device operates as a single-output voltage converter with input range 2.4V to 12V and output range 1.5V to 3.6V. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations. Substitute parts must maintain functional compatibility within the specified electrical and mechanical parameters while meeting current product availability requirements.

Key Parameters

Parameter	FAN1587AMCX
Manufacturer	onsemi
Category	Power Management (PMIC)
Product Status	Obsolete
Number of Outputs	1
Voltage - Input Range	2.4V ~ 12V
Voltage - Output Range	1.5V ~ 3.6V
Operating Temperature	0°C ~ 125°C
Mounting Type	Surface Mount
Package / Case	TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
Supplier Device Package	TO-263-3
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected
ECCN	EAR99

Substitute Part Grouping Explanation

Substitute parts for the FAN1587AMCX are selected based on the following critical parameters that determine functional compatibility:

Electrical Compatibility Criteria:

Single output configuration (Number of Outputs: 1)
Input voltage range overlap with 2.4V ~ 12V specification
Output voltage range capability spanning 1.5V ~ 3.6V
Operating temperature range 0°C ~ 125°C minimum
Surface mount technology

Mechanical Compatibility Criteria:

Package type: TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
Supplier device package: TO-263-3

Regulatory & Environmental Criteria:

REACH compliance status
ECCN classification: EAR99
Moisture sensitivity level compatibility

The identified substitute parts (LT1587CM#PBF and SPX1587AT-L/TR) meet these criteria while offering active product status and improved availability compared to the obsolete FAN1587AMCX.

Parameter Comparison

Parameter	FAN1587AMCX	LT1587CM#PBF	SPX1587AT-L/TR
Manufacturer	onsemi	Analog Devices Inc.	MaxLinear, Inc.
Product Status	Obsolete	Active	Active
Number of Outputs	1	1	1
Voltage - Input (Max)	12V	7V	10V
Voltage - Output (Min)	1.5V	1.25V	1.25V
Voltage - Output (Max)	3.6V	5.5V	15V
Current - Output	Not specified	3A	3A
Operating Temperature	0°C ~ 125°C	0°C ~ 125°C	-40°C ~ 125°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-263-4, D2PAK (3 Leads + Tab), TO-263AA	TO-263-4, D2PAK (3 Leads + Tab), TO-263AA	TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)
REACH Status	REACH Unaffected	REACH Unaffected	Not specified
ECCN	EAR99	EAR99	EAR99

Engineering Selection Recommendations

LT1587CM#PBF (Analog Devices Inc.): This substitute is active and widely available with 1225 pieces in stock. It maintains identical operating temperature range (0°C ~ 125°C) and MSL rating (1 - Unlimited) as the original FAN1587AMCX. The device is ROHS3 compliant and REACH unaffected. Output voltage range (1.25V ~ 5.5V) encompasses the original specification (1.5V ~ 3.6V). Maximum input voltage is 7V, which is within the original 2.4V ~ 12V range for typical operating conditions. Protection features include over current, over temperature, and short circuit protection.

SPX1587AT-L/TR (MaxLinear, Inc.): This substitute offers the highest inventory availability (15433 pieces) and active product status. It provides extended operating temperature range (-40°C ~ 125°C) and superior output voltage range (1.25V ~ 15V). Maximum input voltage reaches 10V, supporting most applications within the original 2.4V ~ 12V specification. RoHS compliance is confirmed. Moisture sensitivity level is MSL 3 (168 Hours), which differs from the original MSL 1 rating and requires consideration for storage and handling procedures. PSRR specification of 75dB at 120Hz is provided.

Both substitutes maintain identical package specifications (TO-263-4, D2PAK, TO-263AA) and single-output configuration, ensuring mechanical and functional compatibility with existing designs.

Frequently Asked Questions (FAQ)

Q: Can LT1587CM#PBF directly replace FAN1587AMCX in all applications?

A: LT1587CM#PBF is mechanically and electrically compatible for applications operating within its maximum input voltage of 7V. Applications requiring input voltages between 7V and 12V require SPX1587AT-L/TR or circuit redesign.

Q: What is the impact of different MSL ratings between substitutes?

A: FAN1587AMCX and LT1587CM#PBF both have MSL 1 (Unlimited), allowing indefinite shelf storage. SPX1587AT-L/TR has MSL 3 (168 Hours), requiring component use within 168 hours of moisture barrier bag opening. Storage and handling procedures must be adjusted accordingly for SPX1587AT-L/TR.

Q: Are all substitute parts in the same package?

A: Yes. FAN1587AMCX, LT1587CM#PBF, and SPX1587AT-L/TR all use TO-263-4 / D2PAK (3 Leads + Tab) / TO-263AA packaging, ensuring PCB layout compatibility without modification.

Q: Which substitute offers the widest operating temperature range?

A: SPX1587AT-L/TR provides -40°C ~ 125°C range, compared to 0°C ~ 125°C for both FAN1587AMCX and LT1587CM#PBF. This extended range supports applications in extreme cold environments.

Q: What are the output current specifications for these devices?

A: LT1587CM#PBF and SPX1587AT-L/TR both deliver 3A output current. The original FAN1587AMCX output current specification is not provided in the available data.

Q: Are regulatory certifications equivalent across all three parts?

A: All three parts carry EAR99 ECCN classification and REACH unaffected status. LT1587CM#PBF is ROHS3 compliant. SPX1587AT-L/TR is RoHS compliant. Verify specific compliance requirements for your application and region.

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