RC1587M33 Equivalent & Substitute Parts

Part Overview

The RC1587M33 is an obsolete Intel Pentium® II GTL+ Pro Voltage Regulator IC manufactured by onsemi. This converter IC delivers a fixed 3.3V output from a 5.1V to 7V input supply and is housed in a TO-263-3 (D2PAK) surface mount package. Due to its obsolete product status, identifying compatible substitute components is essential for system redesign, legacy system maintenance, and production continuity.

Substiute Parts

RC1587M33

onsemiIn Stock: 1483RC1587M33 Datasheet

Current PartRFQ

LD1085D2T33R

STMicroelectronicsIn Stock: 45271LD1085D2T33R Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The LD1085D2T33R from STMicroelectronics qualifies as a functional substitute based on the following critical parameters:

Matching Criteria:

• Fixed 3.3V output voltage
• Single output configuration
• D2PAK (TO-263) surface mount package
• MSL 1 (Unlimited) moisture sensitivity rating
• REACH Unaffected compliance status
• Active product status with current availability

Substitution Logic: The LD1085D2T33R is a linear voltage regulator with electrical and mechanical compatibility to the RC1587M33. Both devices deliver 3.3V fixed output in identical D2PAK packaging. The LD1085D2T33R operates across a wider input voltage range (up to 30V maximum) and supports higher output current (3A), making it suitable for applications requiring the RC1587M33's core functionality.

Parameter Comparison

Engineering Selection Recommendations

The LD1085D2T33R is the designated substitute for the obsolete RC1587M33 based on electrical and mechanical compatibility. Selection of the LD1085D2T33R is supported by:

• Active product status with established supply chain availability (45,200 pcs in stock)
• Identical fixed 3.3V output voltage and single-output configuration
• Mechanical compatibility with TO-263-3 D2PAK footprint
• Equivalent MSL 1 rating and REACH Unaffected compliance
• Extended operating temperature range (-40°C to 125°C) providing broader environmental coverage
• RoHS3 compliance certification

The LD1085D2T33R accommodates the RC1587M33's input voltage range (5.1V ~ 7V) within its maximum 30V specification and provides 3A output current capacity.

Frequently Asked Questions (FAQ)

Q: Can the LD1085D2T33R directly replace the RC1587M33 in existing PCB designs?

A: Yes. Both devices share identical TO-263-3 D2PAK pinout and footprint. The LD1085D2T33R pin configuration is mechanically and electrically compatible with the RC1587M33 layout.

Q: What is the primary reason for substitution?

A: The RC1587M33 is obsolete. The LD1085D2T33R is an active product with current manufacturing and supply availability.

Q: Are there compliance differences between the two parts?

A: Both parts carry MSL 1 (Unlimited) ratings and REACH Unaffected status. The LD1085D2T33R additionally carries RoHS3 compliance certification.

Q: Does the LD1085D2T33R support the same input voltage range?

A: Yes. The RC1587M33 input range of 5.1V ~ 7V falls within the LD1085D2T33R maximum input specification of 30V.

Q: What is the package difference between TO-263-3 and D2PAK?

A: TO-263-3 and D2PAK (2 Leads + Tab) refer to the same surface mount package family. Both the RC1587M33 and LD1085D2T33R use this identical package configuration.

Q: Is thermal performance affected by substitution?

A: Both devices operate across overlapping temperature ranges. The LD1085D2T33R extends the lower operating limit to -40°C, providing enhanced cold-temperature performance.