PT6503C DC DC Converter Equivalent & Substitute Parts

Part Overview

The PT6503C is a non-isolated Point-of-Load (PoL) module DC DC converter manufactured by Texas Instruments, designed to deliver 2.5V at 8A output from a 4.5V to 6V input supply. This component is classified as obsolete, indicating it has been discontinued and is no longer in active production. The PT6503C operates across the commercial ITE (Information Technology Equipment) application space with integrated over-temperature protection (OTP) and short-circuit protection (SCP) features.

Due to its obsolete status, locating replacement inventory becomes increasingly difficult. Identifying equivalent substitute parts ensures design continuity and maintains supply chain reliability for applications currently utilizing the PT6503C.

Key Parameters

Parameter	PT6503C Value
Manufacturer	Texas Instruments
Product Status	Obsolete
Type	Non-Isolated PoL Module
Number of Outputs	1
Voltage - Input (Min)	4.5V
Voltage - Input (Max)	6V
Voltage - Output	2.5V
Current - Output (Max)	8A
Operating Temperature	-40°C ~ 85°C
Efficiency	83%
Mounting Type	Surface Mount
Package / Case	14-SMD Module
RoHS Status	ROHS3 Compliant
Applications	ITE (Commercial)

Substitute Part Grouping Explanation

Substitute parts for the PT6503C are selected based on the following critical parameters that determine functional compatibility:

Input Voltage Range Compatibility: The PT6503C operates with a 4.5V to 6V input. Substitute parts must accommodate this input range within their specified operating window.

Output Voltage Capability: The PT6503C delivers a fixed 2.5V output. Substitute parts must be capable of producing 2.5V within their programmable or fixed output voltage range.

Output Current Rating: The PT6503C provides 8A maximum output current. Substitute parts must meet or exceed this current requirement.

Mounting and Package Type: The PT6503C uses surface mount technology in a 14-SMD module form factor. Substitute parts must be compatible with surface mount assembly processes.

Operating Temperature Range: The PT6503C operates from -40°C to 85°C. Substitute parts must support this temperature envelope.

Regulatory Compliance: The PT6503C is ROHS3 compliant. Substitute parts must maintain equivalent compliance status.

Product Status: Active product status ensures ongoing availability and support, contrasting with the obsolete PT6503C.

Parameter Comparison

Parameter	PT6503C	PTH08T240WAZ	PTH04T240WAZ
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active
Type	Non-Isolated PoL Module	Non-Isolated PoL Module	Non-Isolated PoL Module
Number of Outputs	1	1	1
Voltage - Input (Min)	4.5V	4.5V	2.2V
Voltage - Input (Max)	6V	14V	5.5V
Voltage - Output	2.5V (Fixed)	0.69 ~ 5.5V (Programmable)	0.69 ~ 3.6V (Programmable)
Current - Output (Max)	8A	10A	10A
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Efficiency	83%	95%	94%
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	14-SMD Module	11-SMD Module	11-SMD Module
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Applications	ITE (Commercial)	ITE (Commercial)	ITE (Commercial)

Engineering Selection Recommendations

PTH08T240WAZ Substitution: The PTH08T240WAZ is an active product that accepts the PT6503C input voltage range of 4.5V to 6V and provides programmable output voltage capability spanning 0.69V to 5.5V, which includes the required 2.5V output. The PTH08T240WAZ delivers 10A maximum output current, exceeding the PT6503C requirement of 8A. Operating temperature range matches at -40°C to 85°C. The PTH08T240WAZ achieves 95% efficiency compared to the PT6503C at 83%, representing improved thermal performance. Both devices maintain ROHS3 compliance. The PTH08T240WAZ operates in an 11-SMD module package, reducing board footprint compared to the 14-SMD module of the PT6503C. Active product status ensures continued availability and manufacturer support.

PTH04T240WAZ Substitution: The PTH04T240WAZ is an active product with programmable output voltage capability spanning 0.69V to 3.6V, which includes the required 2.5V output. The input voltage range of 2.2V to 5.5V encompasses the PT6503C minimum input of 4.5V and maximum input of 6V. The PTH04T240WAZ delivers 10A maximum output current, exceeding the PT6503C requirement of 8A. Operating temperature range matches at -40°C to 85°C. The PTH04T240WAZ achieves 94% efficiency compared to the PT6503C at 83%. Both devices maintain ROHS3 compliance. The PTH04T240WAZ operates in an 11-SMD module package, reducing board footprint. Active product status ensures continued availability and manufacturer support.

Both substitute parts are manufactured by Texas Instruments, maintaining design ecosystem consistency. Selection between PTH08T240WAZ and PTH04T240WAZ depends on application-specific input voltage requirements and output voltage programming flexibility needs.

Frequently Asked Questions (FAQ)

Q: Can the PTH08T240WAZ directly replace the PT6503C without circuit modifications?

A: The PTH08T240WAZ requires output voltage programming to establish the 2.5V output level, whereas the PT6503C provides fixed 2.5V output. Circuit design modifications are necessary to implement the feedback network for voltage programming on the PTH08T240WAZ. The PTH08T240WAZ input voltage range of 4.5V to 14V fully accommodates the PT6503C input specification of 4.5V to 6V.

Q: What are the key differences between PTH08T240WAZ and PTH04T240WAZ?

A: The PTH08T240WAZ accepts input voltages from 4.5V to 14V and provides programmable output from 0.69V to 5.5V. The PTH04T240WAZ accepts input voltages from 2.2V to 5.5V and provides programmable output from 0.69V to 3.6V. Both deliver 10A maximum output current and operate across -40°C to 85°C. Selection depends on whether the application requires the extended input voltage range (PTH08T240WAZ) or operates within the lower voltage envelope (PTH04T240WAZ).

Q: How does the package size difference affect board layout?

A: The PT6503C uses a 14-SMD module measuring 1.71" L x 1.22" W x 0.42" H. Both substitute parts use an 11-SMD module measuring 0.87" L x 0.62" W x 0.36" H (PTH08T240WAZ) and 0.87" L x 0.62" W x 0.35" H (PTH04T240WAZ). The substitute parts occupy significantly smaller board area, enabling layout optimization and reduced thermal footprint.

Q: Are the substitute parts compatible with the PT6503C mounting footprint?

A: No. The PT6503C uses a 14-SMD module footprint, while both substitute parts use an 11-SMD module footprint. PCB layout modifications are required to accommodate the different pin configuration and physical dimensions of the substitute parts.

Q: What is the impact of higher efficiency on thermal design?

A: The PTH08T240WAZ operates at 95% efficiency and PTH04T240WAZ at 94% efficiency, compared to the PT6503C at 83%. Higher efficiency reduces power dissipation, lowering thermal load on the PCB and potentially eliminating or reducing thermal management requirements such as heat sinks or forced air cooling.

Q: Do the substitute parts maintain the same protection features?

A: The PT6503C includes over-temperature protection (OTP) and short-circuit protection (SCP). The PTH08T240WAZ and PTH04T240WAZ include remote on/off control, over-current protection (OCP), over-temperature protection (OTP), and under-voltage lockout (UVLO), providing enhanced protection functionality beyond the original part.

Q: What is the moisture sensitivity level difference?

A: The PT6503C has MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. The PTH08T240WAZ and PTH04T240WAZ have MSL 3 (168 Hours), requiring moisture control during storage and handling. Standard moisture barrier packaging and handling procedures address this requirement.

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