CS51033YDR8G Equivalent & Substitute Parts

Part Overview

The CS51033YDR8G is a buck regulator positive output step-down DC-DC controller IC manufactured by onsemi in an 8-SOIC package. This device functions as a transistor driver for step-down topology applications with a single output phase. The part is currently classified as obsolete, making identification of equivalent and substitute components essential for ongoing design support, production continuity, and system maintenance.

Substiute Parts

CS51033YDR8G

onsemiIn Stock: 842CS51033YDR8G Datasheet

Current PartRFQ

MAX1649ESA+T

Analog Devices Inc./Maxim IntegratedIn Stock: 863MAX1649ESA+T Datasheet

Parametric EquivalentRFQ

MAX1651ESA+T

Analog Devices Inc./Maxim IntegratedIn Stock: 3712MAX1651ESA+T Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CS51033YDR8G are identified based on strict electrical and mechanical parameter alignment within the buck regulator controller category. The substitution criteria are:

Critical Matching Parameters:

• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Function: Step-Down
• Output Type: Transistor Driver
• Topology: Buck
• Number of Outputs: 1
• Output Phases: 1
• Voltage - Supply (Vcc/Vdd): 3V ~ 16V
• Operating Temperature: -40°C ~ 85°C (TA)
• Mounting Type: Surface Mount

The identified substitute parts MAX1649ESA+T and MAX1651ESA+T meet all critical electrical and mechanical parameters. Both devices are manufactured by Analog Devices Inc./Maxim Integrated, maintain active product status, and are available in the same 8-SOIC package configuration. These substitutes support the same supply voltage range and operating temperature specifications as the original CS51033YDR8G.

Parameter Comparison

Engineering Selection Recommendations

Both MAX1649ESA+T and MAX1651ESA+T are suitable substitutes for the obsolete CS51033YDR8G based on parameter equivalence. Selection between these two alternatives should be based on availability and inventory requirements:

MAX1649ESA+T: 800 pieces available in stock. Active product status with ROHS3 compliance certification.

MAX1651ESA+T: 3639 pieces available in stock. Active product status with ROHS3 compliance certification. Higher inventory availability supports extended production runs and supply chain continuity.

Both substitutes maintain identical electrical specifications for supply voltage range, operating temperature, package configuration, and functional topology. The increased maximum switching frequency (300kHz versus 200kHz) and higher maximum duty cycle (96.5% versus 83.3%) in the substitute parts provide enhanced design flexibility for step-down regulator applications.

Frequently Asked Questions (FAQ)

Q: Why is the CS51033YDR8G classified as obsolete? A: The CS51033YDR8G has reached end-of-life status with onsemi. Substitute parts ensure continued availability for maintenance, repair, and new production requirements.

Q: Are MAX1649ESA+T and MAX1651ESA+T pin-compatible with CS51033YDR8G? A: Both substitute parts share the identical 8-SOIC package configuration (0.154", 3.90mm Width) and are designed for the same buck regulator controller application topology. Pin compatibility must be verified against specific application schematics and PCB layouts.

Q: What is the difference between MAX1649ESA+T and MAX1651ESA+T? A: Both devices meet the electrical and mechanical parameters required for CS51033YDR8G substitution. The primary distinction is inventory availability, with MAX1651ESA+T offering significantly higher stock levels (3639 pieces versus 800 pieces).

Q: Do the substitute parts support the same supply voltage range? A: Yes. Both MAX1649ESA+T and MAX1651ESA+T support the 3V ~ 16V supply voltage range specified for the CS51033YDR8G.

Q: Are the substitute parts RoHS compliant? A: Yes. Both MAX1649ESA+T and MAX1651ESA+T are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the operating temperature range for the substitute parts? A: Both substitute parts operate across the -40°C ~ 85°C (TA) temperature range, matching the original CS51033YDR8G specification.