RP110L331B-TR Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The RP110L331B-TR is an active linear voltage regulator IC manufactured by Nisshinbo Micro Devices Inc. This positive fixed output regulator delivers 150mA at 3.3V with a maximum dropout voltage of 0.35V. The device is housed in a 4-XDFN exposed pad package and includes enable control and over-current protection features. The part is RoHS compliant and carries an MSL rating of 1 (unlimited moisture sensitivity).

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter ranges. The LD39020DTPU33R from STMicroelectronics serves as a direct functional equivalent with enhanced output current capability and extended operating temperature range.

Substiute Parts

RP110L331B-TR

Nisshinbo Micro Devices Inc.In Stock: 1202RP110L331B-TR Datasheet

Current PartRFQ

LD39020DTPU33R

STMicroelectronicsIn Stock: 6140LD39020DTPU33R Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RP110L331B-TR is determined by the following critical parameters:

Fixed Output Voltage: Both the main part and substitute must deliver 3.3V fixed output to maintain circuit compatibility.

Package Compatibility: The 4-XDFN exposed pad package is the mechanical standard. Substitute parts must use identical or functionally equivalent package geometry to ensure PCB footprint compatibility.

Output Current Rating: The substitute must meet or exceed the 150mA output current requirement. Higher current ratings do not disqualify a part; they provide design margin.

Dropout Voltage: Maximum dropout voltage of 0.35V at rated current ensures proper regulation within the specified input voltage range (5.25V maximum).

Control and Protection Features: Enable control and over-current protection are baseline requirements. Additional protection features in substitutes do not prevent substitution.

Regulatory Compliance: RoHS compliance status must be maintained for applications requiring environmental standards adherence.

The LD39020DTPU33R meets all substitution criteria with equivalent electrical performance and enhanced specifications in output current, operating temperature range, and protection features.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection (RP110L331B-TR): Select this part when the original design specification calls for the Nisshinbo RP110 series and when the 150mA output current and 2µA quiescent current are critical design parameters. This part is active and in stock with RoHS compliance certification.

Substitute Selection (LD39020DTPU33R): The STMicroelectronics LD39020DTPU33R is substitutable when:

• The application requires 150mA or greater output current delivery
• Operating temperature range of -40 to 125°C is acceptable
• Higher quiescent current (40µA versus 2µA) does not violate power budget constraints
• Enhanced protection features (over-temperature and soft-start) provide design benefits
• ROHS3 compliance meets regulatory requirements
• Extended input voltage acceptance (5.5V maximum) accommodates supply variations

Both parts maintain identical 3.3V fixed output voltage, 4-XDFN package footprint, enable control, and MSL 1 rating. The substitute provides superior thermal performance and additional circuit protection without compromising core functionality.

Frequently Asked Questions (FAQ)

Q: Can the LD39020DTPU33R replace the RP110L331B-TR in existing designs without PCB modification?

A: Yes. Both parts use the 4-XDFN exposed pad package with identical pinout and footprint geometry. No PCB layout changes are required for mechanical or electrical compatibility.

Q: What is the impact of the higher quiescent current in the LD39020DTPU33R?

A: The LD39020DTPU33R draws 40µA standby current compared to 2µA in the RP110L331B-TR. In applications where the regulator is continuously enabled, this represents a 38µA increase in system quiescent current. Battery-powered or ultra-low-power designs should evaluate this difference against power budget requirements.

Q: Are both parts suitable for industrial temperature applications?

A: The RP110L331B-TR operates from -40 to 85°C (TA). The LD39020DTPU33R extends this range to -40 to 125°C (TJ), providing superior thermal margin for high-temperature environments. Applications requiring operation above 85°C must use the LD39020DTPU33R.

Q: What additional protection does the LD39020DTPU33R provide?

A: The LD39020DTPU33R includes over-temperature protection and soft-start circuitry in addition to over-current protection. Over-temperature protection disables the regulator if junction temperature exceeds safe limits. Soft-start limits inrush current during power-up, reducing stress on input capacitors and downstream circuitry.

Q: Is the higher output current rating of the LD39020DTPU33R (200mA versus 150mA) a concern?

A: No. Higher current ratings indicate greater design margin and do not create compatibility issues. The substitute can deliver 200mA while the application requires only 150mA, providing headroom for transient loads or future design modifications.

Q: Do both parts meet the same regulatory compliance standards?

A: Both parts are RoHS compliant. The RP110L331B-TR carries RoHS Compliant status, while the LD39020DTPU33R carries ROHS3 Compliant status. ROHS3 represents the current regulatory standard and is fully backward compatible with RoHS requirements.

Q: What is the difference between the packaging designations TR and CT?

A: TR (Tape & Reel) and CT (Cut Tape) refer to supply format, not component specifications. Both formats contain identical parts; the difference is in how they are packaged for delivery and automated assembly. The electrical and mechanical specifications remain unchanged.