LM5027AMH/NOPB Equivalent & Substitute Parts

Part Overview

The LM5027AMH/NOPB is a Forward Converter Regulator controller IC manufactured by Texas Instruments, designed for positive, isolation-capable output step-up/step-down DC-DC conversion applications. This device operates as a transistor driver with integrated frequency control, ramp, and soft start features across a wide supply voltage range of 13V to 90V.

The LM5027AMH/NOPB is classified as obsolete, making substitute parts necessary for new designs and ongoing production requirements. The primary substitute is the LM5025AMTC/NOPB, which maintains core forward converter functionality while offering enhanced features and improved availability.

Substiute Parts

LM5027AMH/NOPB

Texas InstrumentsIn Stock: 914LM5027AMH/NOPB Datasheet

Current PartRFQ

LM5025AMTC/NOPB

Texas InstrumentsIn Stock: 1960LM5025AMTC/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM5027AMH/NOPB is determined by the following critical parameters:

Core Functional Requirements:

• Topology: Forward Converter
• Output Type: Transistor Driver
• Output Configuration: Positive, Isolation Capable
• Function: Step-Up/Step-Down DC-DC control

Electrical Compatibility Criteria:

• Operating Temperature Range: -40°C ~ 125°C (TJ)
• RoHS3 Compliance
• REACH Unaffected status
• Surface Mount technology

Mechanical Compatibility:

• Package form factor compatibility with 20-pin TSSOP family

The LM5025AMTC/NOPB qualifies as a substitute based on matching forward converter topology, transistor driver output type, positive isolation-capable configuration, and identical operating temperature and compliance certifications. While the LM5025AMTC/NOPB operates with a reduced supply voltage range (8V ~ 15V) and different output count (2 outputs versus 3), it maintains the core forward converter control architecture and meets all regulatory and environmental requirements.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The LM5027AMH/NOPB is classified as obsolete, necessitating transition to active alternatives. The LM5025AMTC/NOPB carries a Last Time Buy status, indicating limited future availability. Both devices maintain ROHS3 compliance and REACH unaffected certification, meeting current regulatory requirements for new designs.

Compliance & Certification: Both the main part and substitute meet identical environmental and regulatory standards: ROHS3 compliance, REACH unaffected status, and unlimited moisture sensitivity level (MSL 1). This ensures equivalent reliability and regulatory acceptance in equivalent applications.

Supply Voltage Consideration: The primary design constraint for substitution is the supply voltage range differential. The LM5027AMH/NOPB operates across 13V to 90V, while the LM5025AMTC/NOPB is limited to 8V to 15V. Selection must verify that the target application supply voltage falls within the 8V to 15V window for LM5025AMTC/NOPB compatibility.

Output Configuration: The LM5027AMH/NOPB provides 3 outputs, while the LM5025AMTC/NOPB provides 2 outputs. Application designs requiring 3-output capability cannot use the LM5025AMTC/NOPB as a direct substitute without circuit redesign.

Frequently Asked Questions (FAQ)

Q: Can the LM5025AMTC/NOPB directly replace the LM5027AMH/NOPB in all applications?

A: Direct replacement is possible only when the application supply voltage operates within the 8V to 15V range and requires no more than 2 outputs. Applications requiring the full 13V to 90V supply range or 3-output capability require circuit redesign.

Q: What are the key differences between these parts?

A: The primary differences are supply voltage range (LM5027AMH/NOPB: 13V ~ 90V versus LM5025AMTC/NOPB: 8V ~ 15V), output count (3 versus 2), switching frequency (310kHz versus 200kHz ~ 580kHz), maximum duty cycle (72.5% versus 80%), and clock synchronization capability (not available versus available). Both maintain forward converter topology and identical operating temperature range.

Q: Are there package compatibility concerns?

A: The LM5027AMH/NOPB uses a 20-PowerTSSOP package, while the LM5025AMTC/NOPB uses a 16-TSSOP package. These are different pin counts and physical dimensions, requiring PCB layout redesign for substitution.

Q: Do both parts meet current regulatory requirements?

A: Yes. Both the LM5027AMH/NOPB and LM5025AMTC/NOPB are ROHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited) moisture sensitivity ratings, meeting current environmental and regulatory standards.

Q: What is the significance of the product status difference?

A: The LM5027AMH/NOPB is obsolete with no further availability. The LM5025AMTC/NOPB is Last Time Buy, indicating limited remaining inventory. For new designs, neither part should be selected; instead, consult Texas Instruments for current forward converter controller alternatives.