LP3855ES-2.5/NOPB Equivalent & Substitute Parts

Part Overview

The LP3855ES-2.5/NOPB is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. This positive fixed output regulator delivers 1.5A at 2.5V with a maximum dropout voltage of 0.38V at full load, housed in a TO-263 (DDPAK-5) surface mount package. The device is currently in active production status with 699 units in stock.

Substitute parts are necessary when the primary part becomes unavailable, reaches end-of-life status, or when design requirements necessitate alternative electrical characteristics such as higher input voltage tolerance or different quiescent current specifications.

Substiute Parts

LP3855ES-2.5/NOPB

Texas InstrumentsIn Stock: 764LP3855ES-2.5/NOPB Datasheet

Current PartRFQ

TPS7A4525KTTR

Texas InstrumentsIn Stock: 7025TPS7A4525KTTR Datasheet

MFR RecommendedRFQ

LP3872ES-2.5/NOPB

Texas InstrumentsIn Stock: 2334LP3872ES-2.5/NOPB Datasheet

Parametric EquivalentRFQ

LP3962ES-2.5/NOPB

National SemiconductorIn Stock: 10266LP3962ES-2.5/NOPB Datasheet

Parametric EquivalentRFQ

LP3965ES-2.5/NOPB

Texas InstrumentsIn Stock: 1063LP3965ES-2.5/NOPB Datasheet

Parametric EquivalentRFQ

LP3965ES-2.5

Texas InstrumentsIn Stock: 2317LP3965ES-2.5 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LP3855ES-2.5/NOPB is determined by the following critical parameters:

• Output voltage fixed at 2.5V
• Output current capability of 1.5A
• Package type: TO-263 (DDPAK-5) surface mount
• Operating temperature range: -40°C to 125°C
• Control features: Enable function
• Protection features: Over Current, Over Temperature, Short Circuit

Substitute parts are grouped into two categories:

Manufacturer Recommended Substitute: TPS7A4525KTTR meets the core electrical specifications but operates with a higher maximum input voltage (20V vs. 7V) and exhibits different quiescent current and supply current characteristics. This part is designated as obsolete.

Parametric Equivalents: LP3872ES-2.5/NOPB, LP3962ES-2.5/NOPB, LP3965ES-2.5/NOPB, and LP3965ES-2.5 maintain identical output voltage and current ratings with matching package specifications. These parts share the same input voltage maximum (7V), operating temperature range, and protection features, with variations in dropout voltage and quiescent current within acceptable engineering tolerances.

Parameter Comparison

Engineering Selection Recommendations

For Active Production Designs:

LP3872ES-2.5/NOPB and LP3965ES-2.5/NOPB are preferred substitutes. Both maintain active product status, ROHS3 compliance, and identical input voltage specifications. LP3872ES-2.5/NOPB exhibits slightly lower quiescent current (5 mA) compared to LP3965ES-2.5/NOPB (9 mA), making it suitable for battery-powered applications where standby current is critical. Both parts accept the same input voltage range and package footprint as the primary part.

For Extended Availability:

LP3965ES-2.5 provides the highest inventory availability (2,300 units) but carries Last Time Buy status, indicating limited future procurement windows. This part is suitable for designs with extended production timelines where component availability must be secured immediately.

For Higher Input Voltage Applications:

TPS7A4525KTTR accommodates input voltages up to 20V, compared to 7V for the primary part. However, this substitute is obsolete and should only be selected if existing designs require the extended input voltage range and no redesign is feasible. Reverse polarity protection is included in this variant.

For Compliance-Critical Applications:

LP3962ES-2.5/NOPB is listed as REACH Affected, requiring verification against specific application compliance requirements before selection.

Frequently Asked Questions (FAQ)

Q: Can LP3872ES-2.5/NOPB be used as a direct replacement for LP3855ES-2.5/NOPB?

A: Yes, for applications where the increased dropout voltage (0.55V vs. 0.38V) is acceptable. Both parts deliver 1.5A at 2.5V in identical TO-263 packages with matching input voltage specifications (7V max) and operating temperature ranges. The primary difference is quiescent current (5 mA vs. 3 mA) and dropout voltage performance.

Q: What is the impact of higher quiescent current in LP3965ES-2.5/NOPB?

A: The 9 mA quiescent current in LP3965ES-2.5/NOPB is 3 times higher than the primary part's 3 mA specification. In applications with continuous operation, this results in approximately 6 mW additional standby power dissipation. For battery-powered or low-power standby applications, LP3872ES-2.5/NOPB (5 mA) is a better choice.

Q: Is TPS7A4525KTTR suitable for new designs?

A: No. TPS7A4525KTTR is obsolete and should not be selected for new production designs. It is listed only as a historical reference for existing designs that may require this part. For new applications, select from the active or Last Time Buy alternatives.

Q: Are all substitute parts pin-compatible?

A: Yes. All listed substitutes use the TO-263 (DDPAK-5) package with identical pinout and footprint, enabling direct PCB replacement without layout modifications.

Q: What is the difference between LP3965ES-2.5 and LP3965ES-2.5/NOPB?

A: Both parts are electrically identical with matching specifications. The "/NOPB" suffix indicates "No Lead (Pb)" RoHS compliance marking. LP3965ES-2.5 carries Last Time Buy status with higher inventory (2,300 units), while LP3965ES-2.5/NOPB is active. Verify packaging and labeling requirements for your application before selection.

Q: Can I use TPS7A4525KTTR if my circuit requires 20V input?

A: TPS7A4525KTTR supports 20V maximum input voltage, compared to 7V for other alternatives. However, this part is obsolete. If your design requires higher input voltage tolerance, consider redesigning the power supply circuit to operate within 7V specifications, or consult with component suppliers for extended availability options.