78SR112SC DC DC Converter 12V Equivalent & Substitute Parts

Part Overview

The Texas Instruments 78SR112SC is a non-isolated Point-of-Load (PoL) module DC DC converter designed for commercial ITE applications. This component delivers a fixed 12V output at 1.5A maximum current from a 14.5V to 30V input range. The 78SR112SC is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility while meeting current supply chain requirements.

Substiute Parts

78SR112SC

Texas InstrumentsIn Stock: 87578SR112SC Datasheet

Current PartRFQ

R-78T12-1.0/FC-TRAY

Recom PowerIn Stock: 757R-78T12-1.0/FC-TRAY Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete 78SR112SC is determined by the following critical parameters:

Output Voltage Compatibility: The substitute must provide a fixed 12V output to maintain circuit functionality.

Input Voltage Range: The substitute must accept the system input voltage range. The 78SR112SC operates from 14.5V to 30V. Substitute components with input ranges that encompass or exceed this specification are functionally compatible.

Output Current Capacity: The 78SR112SC delivers 1.5A maximum. Substitutes with equal or greater current ratings maintain or exceed performance capability.

Mounting and Package Type: Surface mount configuration with compatible SMD module form factor ensures mechanical and electrical integration into existing PCB layouts.

Operating Temperature Range: The -40°C to 85°C specification must be maintained or exceeded for thermal compatibility.

Regulatory Compliance: RoHS3 compliance and REACH unaffected status are mandatory for commercial ITE applications.

The Recom Power R-78T12-1.0/FC-TRAY meets these substitution criteria with compatible output voltage, expanded input voltage range, and active product status.

Parameter Comparison

Engineering Selection Recommendations

Substitution Feasibility: The R-78T12-1.0/FC-TRAY is a direct functional substitute for the obsolete 78SR112SC. Both components share identical output voltage (12V), matching operating temperature range (-40°C to 85°C), and equivalent regulatory compliance (RoHS3, REACH unaffected).

Product Status Advantage: The R-78T12-1.0/FC-TRAY maintains active product status with current manufacturing and supply chain availability, eliminating obsolescence risk associated with the 78SR112SC.

Input Voltage Consideration: The R-78T12-1.0/FC-TRAY accepts a wider input voltage range (15V to 42V) compared to the 78SR112SC (14.5V to 30V). The minimum input voltage differs by 0.5V (15V versus 14.5V). Applications operating at the lower boundary of the original specification (14.5V to 15V) require verification of system input voltage stability.

Output Current Derating: The R-78T12-1.0/FC-TRAY provides 1A maximum output current, compared to 1.5A for the 78SR112SC. Applications requiring the full 1.5A output capacity must evaluate alternative substitutes or implement load management strategies.

Efficiency Improvement: The R-78T12-1.0/FC-TRAY delivers 95% efficiency versus 90% for the 78SR112SC, resulting in reduced thermal dissipation and improved power conversion performance.

Package Geometry: The R-78T12-1.0/FC-TRAY (25.0mm x 23.0mm x 10.0mm) is slightly larger than the 78SR112SC (23.9mm x 22.9mm x 8.6mm). PCB layout verification is required to confirm mechanical fit within existing component placement constraints.

Frequently Asked Questions (FAQ)

Q: Can the R-78T12-1.0/FC-TRAY directly replace the 78SR112SC without circuit modifications?

A: The R-78T12-1.0/FC-TRAY provides the same 12V output voltage and operating temperature range as the 78SR112SC. However, three factors require evaluation: (1) the minimum input voltage is 15V instead of 14.5V; (2) maximum output current is 1A instead of 1.5A; (3) physical dimensions are slightly larger. Circuit modifications are not required if system input voltage remains above 15V and load current does not exceed 1A.

Q: What is the impact of the 0.5V difference in minimum input voltage?

A: The 78SR112SC operates from 14.5V minimum, while the R-78T12-1.0/FC-TRAY requires 15V minimum. If the system input voltage can drop below 15V under normal operating conditions, the R-78T12-1.0/FC-TRAY will not function within specification. System input voltage stability analysis is necessary to confirm compatibility.

Q: How does the 1A output current limit of the R-78T12-1.0/FC-TRAY compare to the 1.5A rating of the 78SR112SC?

A: The R-78T12-1.0/FC-TRAY is rated for 1A maximum output current, which is 33% lower than the 78SR112SC. Applications drawing more than 1A at 12V output will exceed the substitute component's current rating. Load analysis is required to confirm that system current demand does not exceed 1A.

Q: Are there mechanical compatibility concerns with the larger package size of the R-78T12-1.0/FC-TRAY?

A: The R-78T12-1.0/FC-TRAY measures 25.0mm x 23.0mm x 10.0mm, compared to 23.9mm x 22.9mm x 8.6mm for the 78SR112SC. The substitute is approximately 1.1mm longer, 0.1mm wider, and 1.4mm taller. PCB layout review is required to confirm that the larger footprint and height do not conflict with adjacent components or enclosure constraints.

Q: Do both components share the same regulatory compliance status?

A: Yes. Both the 78SR112SC and R-78T12-1.0/FC-TRAY are RoHS3 compliant and REACH unaffected, meeting commercial ITE application requirements.

Q: What is the advantage of the R-78T12-1.0/FC-TRAY in terms of efficiency?

A: The R-78T12-1.0/FC-TRAY operates at 95% efficiency compared to 90% for the 78SR112SC. This 5% efficiency improvement reduces power dissipation and thermal load on the converter, resulting in lower operating temperatures and extended component life.

Q: Is the R-78T12-1.0/FC-TRAY available in the same packaging format?

A: The R-78T12-1.0/FC-TRAY is supplied in Tray packaging. The 78SR112SC packaging format is not specified in the provided data. Both components use surface mount technology with SMD module construction, ensuring compatibility with automated assembly processes.