MP1586EN-LF-Z Equivalent & Substitute Parts

Part Overview

The MP1586EN-LF-Z is a buck switching regulator IC from Monolithic Power Systems designed for positive adjustable output applications. It delivers 3A output current with an input voltage range of 4.5V to 28V and adjustable output from 0.8V to 25V. The device is packaged in 8-SOIC (0.154", 3.90mm Width) with exposed pad for surface mount applications.

This part carries a "Not For New Designs" status, indicating it is obsolete or being phased out. Identifying suitable substitute components is necessary for ongoing production support, design updates, and long-term supply chain continuity.

Key Parameters

Parameter	Value
Manufacturer	Monolithic Power Systems
Function	Step-Down (Buck)
Output Configuration	Positive Adjustable
Number of Outputs	1
Input Voltage Range	4.5V – 28V
Output Voltage Range	0.8V – 25V
Output Current	3A
Switching Frequency	50kHz – 400kHz
Operating Temperature	-20°C – 85°C (TA)
Package Type	8-SOIC (0.154", 3.90mm Width) Exposed Pad
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the MP1586EN-LF-Z is based on the following core electrical and mechanical parameters:

Topology & Function: Buck switching regulator with step-down capability
Output Configuration: Positive adjustable output
Electrical Specifications: 3A output current capability, input voltage range 4.5V–28V minimum, adjustable output voltage
Switching Frequency: Operation within or compatible with 50kHz–400kHz range
Package Compatibility: Surface mount devices with compatible pinout and thermal characteristics
Compliance: ROHS3 compliance and EAR99 classification

The MP2338GTL-Z qualifies as a manufacturer-recommended substitute based on these parameters while offering improved specifications and active product status.

Parameter Comparison

Parameter	MP1586EN-LF-Z	MP2338GTL-Z
Manufacturer	Monolithic Power Systems	Monolithic Power Systems Inc.
Function	Step-Down	Step-Down
Output Configuration	Positive Adjustable	Positive Adjustable
Number of Outputs	1	1
Input Voltage (Min)	4.5V	4.5V
Input Voltage (Max)	28V	28V
Output Voltage (Min)	0.8V	0.5V
Output Voltage (Max)	25V	26.6V
Output Current	3A	3A
Switching Frequency	50kHz – 400kHz	450kHz
Synchronous Rectifier	No	Yes
Operating Temperature	-20°C – 85°C (TA)	-40°C – 125°C (TJ)
Package Type	8-SOIC (0.154", 3.90mm Width) Exposed Pad	SOT-583
Mounting Type	Surface Mount	Surface Mount
Product Status	Not For New Designs	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	2A (4 Weeks)	1 (Unlimited)

Engineering Selection Recommendations

The MP2338GTL-Z is the manufacturer-recommended substitute for the MP1586EN-LF-Z. Both devices maintain identical input voltage specifications (4.5V–28V) and 3A output current capability, ensuring functional compatibility in buck regulator applications.

The MP2338GTL-Z offers several advantages:

Active Product Status: Designated as an active product, ensuring long-term availability and supply chain support
Extended Temperature Range: Operating range of -40°C to 125°C versus -20°C to 85°C provides broader thermal operating capability
Improved Output Voltage Range: Minimum output voltage of 0.5V versus 0.8V enables lower voltage rail applications
Synchronous Rectification: Integrated synchronous rectifier improves efficiency compared to the asynchronous MP1586EN-LF-Z
Higher Switching Frequency: 450kHz operation reduces external component size requirements
Superior Moisture Sensitivity: MSL rating of 1 (Unlimited) versus 2A (4 Weeks) simplifies storage and handling

Both devices maintain ROHS3 compliance and EAR99 classification. Package differences (8-SOIC versus SOT-583) require PCB layout modification but do not affect electrical compatibility.

Frequently Asked Questions (FAQ)

Q: Can the MP2338GTL-Z directly replace the MP1586EN-LF-Z without circuit modifications?

A: Electrical substitution is valid based on matching input voltage range (4.5V–28V), output current (3A), and adjustable output configuration. However, package differences (8-SOIC versus SOT-583) require PCB layout redesign. The improved output voltage range (0.5V minimum) and synchronous rectification may allow circuit optimization but are not required for basic compatibility.

Q: What are the key differences in switching frequency between these devices?

A: The MP1586EN-LF-Z operates across 50kHz–400kHz with programmable frequency selection. The MP2338GTL-Z operates at a fixed 450kHz. The higher fixed frequency of the MP2338GTL-Z reduces external inductor and capacitor sizes, potentially improving board density and cost.

Q: Are there compliance or certification differences?

A: Both devices are ROHS3 compliant and carry EAR99 classification. The MP2338GTL-Z has superior moisture sensitivity (MSL 1 Unlimited versus MSL 2A 4 Weeks), reducing handling and storage constraints.

Q: Why is the MP1586EN-LF-Z marked "Not For New Designs"?

A: This status indicates the part is obsolete or being phased out by the manufacturer. The MP2338GTL-Z is the active replacement, ensuring continued support for new product development and existing production lines.

Q: What is the impact of the synchronous rectifier in the MP2338GTL-Z?

A: Synchronous rectification replaces the internal diode with a MOSFET, reducing forward voltage drop and improving efficiency, particularly at lower output voltages and higher load currents. This is a performance enhancement with no negative compatibility impact.

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