TPS2551DRVT Equivalent & Substitute Parts

Part Overview

The TPS2551DRVT is an N-Channel power switch driver manufactured by Texas Instruments, designed for general-purpose high-side switching applications. This component operates with a 1:1 input-to-output ratio and delivers up to 1.1A output current across a 2.5V to 6.5V load voltage range. The device is classified as "Not For New Designs," indicating it has reached end-of-life status. Finding equivalent or substitute parts is necessary for ongoing production support, legacy system maintenance, and design flexibility when the primary part becomes unavailable.

Substiute Parts

TPS2551DRVT

Texas InstrumentsIn Stock: 1295TPS2551DRVT Datasheet

Current PartRFQ

TPS2550DRVT

Texas InstrumentsIn Stock: 2963TPS2550DRVT Datasheet

Parametric EquivalentRFQ

MIC2019YML-TR

Microchip TechnologyIn Stock: 6060MIC2019YML-TR Datasheet

MFR RecommendedRFQ

RT9728AHGQW

Richtek USA Inc.In Stock: 9454RT9728AHGQW Datasheet

MFR RecommendedRFQ

RT9728AHZQW

Richtek USA Inc.In Stock: 35391RT9728AHZQW Datasheet

MFR RecommendedRFQ

RT9728ALZQW

Richtek USA Inc.In Stock: 15626RT9728ALZQW Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TPS2551DRVT is determined by the following critical parameters:

• Output Type & Configuration: N-Channel or P-Channel high-side switching capability
• Current Rating: Maximum output current must meet or exceed 1.1A
• Voltage Range: Load voltage compatibility within or exceeding 2.5V ~ 6.5V
• On-Resistance (Rds On): Typical on-resistance at or below 100mOhm to maintain thermal and efficiency characteristics
• Package Compatibility: 6-WDFN or equivalent 6-pin surface-mount packages with exposed pad
• Fault Protection: Current limiting, over-temperature, and UVLO protection features
• Interface Type: On/Off control with non-inverting input logic

Substitute parts are grouped into two categories:

1. Parametric Equivalents (TPS2550DRVT): Identical electrical specifications and N-Channel topology, direct pin-compatible replacement
2. Functional Alternatives (MIC2019YML-TR, RT9728AHGQW, RT9728AHZQW, RT9728ALZQW): P-Channel topology with comparable or superior current ratings and protection features, requiring circuit topology evaluation

Parameter Comparison

Engineering Selection Recommendations

TPS2550DRVT is the direct parametric equivalent and preferred substitute. It maintains identical electrical specifications, N-Channel topology, and thermal operating range (-40°C ~ 150°C junction temperature). Both parts are classified as "Not For New Designs," but TPS2550DRVT offers higher inventory availability (2926 pcs vs. 1192 pcs). This part is suitable for direct replacement in existing designs without circuit modification.

MIC2019YML-TR (Microchip Technology) is an active-status alternative with superior current capacity (2A vs. 1.1A) and lower on-resistance (70mOhm vs. 100mOhm). However, it uses P-Channel topology and operates at a reduced maximum junction temperature (-40°C ~ 85°C ambient). Circuit topology must be re-evaluated for P-Channel operation. This part is recommended for new designs requiring higher current capability.

RT9728AHGQW, RT9728AHZQW, and RT9728ALZQW (Richtek USA Inc.) are active-status P-Channel alternatives with 1.3A current rating and integrated status flag functionality. All three variants share identical electrical specifications but differ in packaging format (RT9728AHZQW offers highest inventory at 35,300 pcs). These parts are suitable for applications requiring USB switch functionality and active product support. P-Channel topology requires circuit re-design.

All substitute parts maintain ROHS3 compliance and are suitable for applications requiring regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can TPS2550DRVT be used as a direct replacement for TPS2551DRVT?

A: Yes. TPS2550DRVT is a parametric equivalent with identical electrical specifications, N-Channel output type, 1.1A current rating, 100mOhm on-resistance, and 6-WDFN package. No circuit modification is required.

Q: What is the primary difference between N-Channel and P-Channel substitutes?

A: N-Channel devices (TPS2551DRVT, TPS2550DRVT) are configured for high-side switching with specific gate drive requirements. P-Channel devices (MIC2019YML-TR, RT9728 series) require different circuit topology and gate drive logic. Substitution between these types requires circuit re-design.

Q: Why do some substitutes have lower maximum operating temperature?

A: MIC2019YML-TR and RT9728 series are rated to -40°C ~ 85°C ambient temperature (TA), while TPS2551DRVT and TPS2550DRVT are rated to -40°C ~ 150°C junction temperature (TJ). Applications requiring operation above 85°C ambient require the Texas Instruments parts or thermal management evaluation.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (TPS2550DRVT, MIC2019YML-TR, RT9728AHGQW, RT9728AHZQW, RT9728ALZQW) are ROHS3 compliant and suitable for applications requiring regulatory compliance.

Q: What is the difference between RT9728AHGQW, RT9728AHZQW, and RT9728ALZQW?

A: These three variants are electrically identical with 1.3A current rating, 120mOhm on-resistance, and 6-WDFN package. The primary difference is packaging format: RT9728AHZQW is supplied in Cut Tape (CT) & Digi-Reel® format with highest inventory availability (35,300 pcs), while RT9728AHGQW and RT9728ALZQW have different packaging configurations with lower inventory levels.

Q: Can MIC2019YML-TR be used in applications requiring current above 1.1A?

A: Yes. MIC2019YML-TR is rated for 2A maximum output current, exceeding the 1.1A requirement of TPS2551DRVT. However, P-Channel topology and reduced operating temperature range (-40°C ~ 85°C ambient) must be evaluated for circuit compatibility.

Q: What fault protection features are common across all substitute parts?

A: All substitute parts include current limiting (adjustable) and over-temperature protection. TPS2551DRVT, TPS2550DRVT, and all RT9728 variants include UVLO (Under-Voltage Lock-Out) protection. MIC2019YML-TR includes current limiting and over-temperature protection without UVLO.