PT6405D DC DC Converter 3.3V Equivalent & Substitute Parts

Part Overview

The PT6405D is a non-isolated Point-of-Load (PoL) module DC DC converter manufactured by Texas Instruments, designed to deliver 3.3V output at 3A from a 4.5V to 5.5V input supply. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new design implementations. The PT6405D operates across a commercial temperature range of 0°C to 70°C with 85% efficiency and is packaged in a 12-SIP module format with through-hole, right-angle mounting configuration.

Substiute Parts

PT6405D

Texas InstrumentsIn Stock: 771PT6405D Datasheet

Current PartRFQ

R-733.3D

Recom PowerIn Stock: 60046R-733.3D Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete PT6405D is determined by strict alignment of the following critical electrical and mechanical parameters:

Electrical Compatibility Requirements:

• Single output configuration delivering 3.3V nominal output voltage
• Maximum output current rating of 3A or greater
• Input voltage range that encompasses the PT6405D minimum specification of 4.5V
• Non-isolated PoL module topology

Mechanical Compatibility Requirements:

• 12-SIP module package format
• Through-hole, right-angle mounting configuration
• Physical dimensions compatible with existing PCB layouts

Regulatory and Environmental Requirements:

• ROHS3 compliance
• MSL rating of 1 (Unlimited)
• Commercial-grade temperature operation capability

The R-733.3D from Recom Power satisfies all substitution criteria through equivalent electrical output specifications, identical package format, and compatible mounting orientation.

Parameter Comparison

Engineering Selection Recommendations

The R-733.3D represents a direct functional substitute for the obsolete PT6405D based on electrical and mechanical parameter equivalence. Both components deliver identical 3.3V output at 3A maximum current and share the same 12-SIP module package with through-hole, right-angle mounting configuration.

The R-733.3D is currently in active production status, ensuring availability for replacement and new design applications. Both components maintain ROHS3 compliance and MSL rating of 1 (Unlimited), satisfying regulatory requirements for commercial-grade applications.

The R-733.3D provides enhanced performance characteristics relative to the PT6405D, including higher efficiency (94% versus 85%), extended operating temperature range (-40°C to 85°C versus 0°C to 70°C), and expanded input voltage tolerance (4.5V to 28V versus 4.5V to 5.5V). These enhanced specifications do not introduce incompatibility and support broader application flexibility.

Frequently Asked Questions (FAQ)

Q: Can the R-733.3D directly replace the PT6405D in existing designs?

A: Yes. The R-733.3D provides identical 3.3V output voltage, 3A maximum output current, and 12-SIP module package format with through-hole, right-angle mounting. No PCB layout modifications are required for direct substitution.

Q: What is the significance of the expanded input voltage range on the R-733.3D?

A: The R-733.3D accepts input voltages from 4.5V to 28V, compared to the PT6405D specification of 4.5V to 5.5V. This expanded range provides design flexibility for applications with variable input supplies. In systems constrained to the original 4.5V to 5.5V input range, both converters operate identically.

Q: Are there differences in control features between these converters?

A: The R-733.3D includes Remote On/Off and Short Circuit Protection (SCP) features with Enable control (Active High). The PT6405D specifications do not document these control features. Designs not utilizing these functions experience no operational difference.

Q: How do the efficiency ratings compare?

A: The R-733.3D operates at 94% efficiency compared to the PT6405D at 85%. This 9% improvement reduces thermal dissipation and power loss in the converter, benefiting overall system thermal management and power budget performance.

Q: Are both components suitable for the same temperature operating environments?

A: The PT6405D operates from 0°C to 70°C, while the R-733.3D operates from -40°C to 85°C. The R-733.3D supports the full PT6405D temperature range and extends capability to lower and higher temperature extremes. Applications limited to 0°C to 70°C operation experience no thermal performance difference.

Q: Do packaging and mounting configurations differ between these parts?

A: Both components use identical 12-SIP module packaging with through-hole, right-angle mounting. Physical dimensions are compatible, and no mechanical redesign is necessary for substitution.

Q: What is the compliance status of both converters?

A: Both the PT6405D and R-733.3D are ROHS3 compliant with MSL rating of 1 (Unlimited). Both satisfy regulatory requirements for commercial-grade ITE applications.