LP3891ET-1.8/NOPB Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP3891ET-1.8/NOPB is a linear voltage regulator IC from Texas Instruments designed for positive fixed 1.8V output applications with 800mA current capacity in a TO-220-5 package. This part is classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity. The LP3891ET-1.8/NOPB provides regulated 1.8V output with integrated protection features including over-current, over-temperature, and short-circuit protection.

Substiute Parts

LP3891ET-1.8/NOPB

Texas InstrumentsIn Stock: 889LP3891ET-1.8/NOPB Datasheet

Current PartRFQ

LP3852ET-1.8/NOPB

Texas InstrumentsIn Stock: 1143LP3852ET-1.8/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LP3891ET-1.8/NOPB is determined by the following critical parameters:

• Fixed output voltage of 1.8V
• TO-220-5 package compatibility
• Positive output configuration
• Operating temperature range of -40°C ~ 125°C
• ROHS3 compliance and REACH unaffected status
• Protection feature set including over-current and over-temperature protection

The LP3852ET-1.8/NOPB qualifies as a direct substitute based on matching output voltage, package type, temperature range, and compliance certifications. The substitute part maintains the same fixed 1.8V output and TO-220-5 form factor while offering enhanced current capacity and active product status.

Parameter Comparison

Engineering Selection Recommendations

The LP3852ET-1.8/NOPB is the qualified substitute for the obsolete LP3891ET-1.8/NOPB. Selection is based on the following engineering criteria:

• Both parts maintain identical fixed 1.8V output voltage specification
• Both parts use the same TO-220-5 package form factor, ensuring mechanical and electrical compatibility
• Both parts operate across the identical -40°C ~ 125°C temperature range
• Both parts carry ROHS3 compliance and REACH unaffected status, meeting regulatory requirements
• The LP3852ET-1.8/NOPB holds active product status, ensuring long-term availability and supply chain continuity
• The substitute part provides higher maximum input voltage (7V vs 5.5V) and increased output current capacity (1.5A vs 800mA), offering design flexibility for applications requiring higher current delivery

Frequently Asked Questions (FAQ)

Q: Can the LP3852ET-1.8/NOPB directly replace the LP3891ET-1.8/NOPB in existing designs?

A: Yes. Both parts share identical fixed 1.8V output voltage, TO-220-5 package configuration, and operating temperature range. Pin-to-pin compatibility and electrical interface are maintained. The substitute part's higher current capacity and input voltage rating do not create incompatibility issues in applications designed for the original part.

Q: What are the key differences between these two parts?

A: The LP3852ET-1.8/NOPB provides 1.5A output current versus 800mA in the LP3891ET-1.8/NOPB, accepts higher maximum input voltage (7V vs 5.5V), and maintains active product status. The LP3891ET-1.8/NOPB includes Under Voltage Lockout (UVLO) protection, which is not listed for the substitute part.

Q: Why is the LP3891ET-1.8/NOPB classified as obsolete?

A: Product obsolescence is determined by the manufacturer. The LP3852ET-1.8/NOPB, as an active product with superior specifications, represents the current generation replacement for this voltage regulator function.

Q: Are there any compliance or certification differences?

A: Both parts carry ROHS3 compliance and REACH unaffected status. Regulatory requirements are met by either part for applications subject to these standards.

Q: What packaging options are available?

A: The LP3891ET-1.8/NOPB is supplied in bulk form. The LP3852ET-1.8/NOPB is available in tube packaging. Both use the TO-220-5 Formed Leads case style.