Equivalent & Substitute Parts Reference: PTB48540CAS

Part Overview

Texas Instruments PTB48540CAS is an isolated PoE DC-DC converter module with a 12V output at up to 850mA and 10W power capability. It supports an input voltage range of 36V to 57V and is equipped with remote On/Off control and multiple protection features. The PTB48540CAS is now designated as Obsolete. Alternative models are required for new designs and for continued manufacturing support due to its obsolete status and non-compliance with RoHS.

Key Parameters

Manufacturer Part Number	Manufacturer	Type	Number of Outputs	Voltage - Input (Min)	Voltage - Input (Max)	Voltage - Output 1	Current - Output (Max)	Power (Watts)	Voltage - Isolation	Efficiency	Mounting Type	Package / Case	Size / Dimension	Operating Temperature	RoHS Status	Product Status
PTB48540CAS	Texas Instruments	Isolated PoE Module	1	36V	57V	12V	850mA	10 W	1.5 kV	85%	Surface Mount	13-SMD Module	1.62" x 1.49" x 0.38" (41.2mm x 38.0mm x 9.6mm)	-40°C ~ 85°C	RoHS non-compliant	Obsolete
RP12-4812SA/SMD	Recom Power	Isolated Module	1	36V	75V	12V	1A	12 W	1.6 kV	87%	Surface Mount	24-SMD Module, 18 Leads	1.26" x 0.80" x 0.44" (32.0mm x 20.3mm x 11.2mm)	-40°C ~ 85°C	ROHS3 Compliant	Active

Substitute Part Grouping Explanation

Substitution is determined strictly by matching the following parameters: Isolated module topology, number of outputs, input voltage range, output voltage, output current, power rating, isolation voltage, efficiency, mounting type, operating temperature range, and package type. The substitute part RP12-4812SA/SMD matches these required criteria for electrical and mechanical compatibility. Product status and environmental compliance further support the selection.

Parameter Comparison

Parameter	PTB48540CAS	RP12-4812SA/SMD
Manufacturer	Texas Instruments	Recom Power
Type	Isolated PoE Module	Isolated Module
Number of Outputs	1	1
Voltage - Input (Min)	36V	36V
Voltage - Input (Max)	57V	75V
Voltage - Output 1	12V	12V
Current - Output (Max)	850mA	1A
Power (Watts)	10 W	12 W
Voltage - Isolation	1.5 kV	1.6 kV
Efficiency	85%	87%
Mounting Type	Surface Mount	Surface Mount
Package / Case	13-SMD Module	24-SMD Module, 18 Leads
Size / Dimension	1.62" x 1.49" x 0.38"	1.26" x 0.80" x 0.44"
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
RoHS Status	RoHS non-compliant	ROHS3 Compliant
Product Status	Obsolete	Active

Engineering Selection Recommendations

The primary driver for selecting RP12-4812SA/SMD as a substitute for PTB48540CAS is the obsolete status and RoHS non-compliance of the PTB48540CAS. RP12-4812SA/SMD is listed as active and ROHS3 compliant, which aligns with regulatory requirements and ongoing support for manufacturing and compliance. All relevant certifications such as REACH unaffected and ECCN status are equivalent in both models.

Frequently Asked Questions (FAQ)

Q1: What are the electrical parameters required for substituting PTB48540CAS?
A1: Substitute parts must match the number of outputs (1), input voltage range (36V minimum), output voltage (12V), minimum output current (850mA), power rating (at least 10W), and isolation voltage (at least 1.5 kV).

Q2: Is the RP12-4812SA/SMD compatible in terms of input and output range?
A2: RP12-4812SA/SMD matches 36V minimum input and provides a 12V output up to 1A, meeting all required ranges.

Q3: Are there differences in packaging and mounting type that affect substitution?
A3: Both models are surface mount DC-DC converter modules. Refer to size and package details for PCB layout compatibility.

Q4: How do RoHS and product status affect part selection?
A4: PTB48540CAS is obsolete and RoHS non-compliant. RP12-4812SA/SMD is active and ROHS3 compliant, supporting current environmental and supply chain requirements.

Q5: Are there temperature or efficiency concerns when substituting?
A5: Both parts operate within -40°C to +85°C, and the RP12-4812SA/SMD offers a slightly higher efficiency than PTB48540CAS.

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