CUD10-02 BK Equivalent & Substitute Parts

Part Overview

The CUD10-02 BK is a general-purpose rectifier diode manufactured by Central Semiconductor Corp, rated for 200 V DC reverse voltage and 10 A average rectified current in a surface mount DPAK package. This component is classified as obsolete, making identification of equivalent substitute parts necessary for ongoing design support and procurement continuity. The part features fast recovery characteristics with a reverse recovery time of 35 ns and is RoHS3 compliant.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	200 V
Current - Average Rectified (Io)	10 A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 10 A
Reverse Recovery Time (trr)	35 ns
Current - Reverse Leakage @ Vr	10 µA @ 200 V
Speed Classification	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Mounting Type	Surface Mount
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63
Operating Temperature - Junction	-65°C ~ 150°C
RoHS Status	RoHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the CUD10-02 BK is based on the following critical parameters that define functional equivalence:

Current Rating: Both the main part and substitute maintain 10 A average rectified current capacity, ensuring identical load-handling capability.

Package Compatibility: Both components use the TO-252-3 DPAK package with identical pinout configuration (2 Leads + Tab), enabling direct PCB footprint compatibility without layout modifications.

Speed Classification: Both parts are classified as fast recovery diodes with reverse recovery time of 35 ns, maintaining switching performance characteristics.

Reverse Voltage Rating: The substitute part (STTH1003SB-TR) is rated for 300 V, which exceeds the 200 V requirement of the original part. This higher rating provides design margin and is acceptable for direct substitution in applications requiring 200 V or lower reverse voltage operation.

Compliance Standards: Both parts are RoHS3 compliant and carry MSL 1 rating, meeting identical environmental and handling requirements.

Parameter Comparison

Parameter	CUD10-02 BK	STTH1003SB-TR	Notes
Manufacturer	Central Semiconductor Corp	STMicroelectronics	Different manufacturers
Product Status	Obsolete	Active	Substitute is in active production
Voltage - DC Reverse (Vr) (Max)	200 V	300 V	Substitute rated higher; acceptable for 200 V applications
Current - Average Rectified (Io)	10 A	10 A	Identical rating
Voltage - Forward (Vf) (Max) @ If	950 mV @ 10 A	1.3 V @ 10 A	Substitute has higher forward voltage drop
Reverse Recovery Time (trr)	35 ns	35 ns	Identical specification
Current - Reverse Leakage @ Vr	10 µA @ 200 V	10 µA @ 300 V	Leakage measured at different voltages; substitute measured at higher voltage
Speed Classification	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Identical classification
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63	TO-252-3, DPAK (2 Leads + Tab), SC-63	Identical package; direct footprint compatibility
Operating Temperature - Junction	-65°C ~ 150°C	175°C (Max)	Substitute supports higher maximum junction temperature
RoHS Status	RoHS3 Compliant	RoHS3 Compliant	Identical compliance
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Identical MSL rating

Engineering Selection Recommendations

The STTH1003SB-TR from STMicroelectronics is a qualified substitute for the obsolete CUD10-02 BK based on the following engineering criteria:

Package Compatibility: Both components use identical TO-252-3 DPAK packaging, enabling direct replacement without PCB redesign or layout modifications.

Electrical Performance: The substitute maintains the 10 A current rating and 35 ns reverse recovery time, preserving switching performance in fast recovery applications. The 300 V reverse voltage rating of the substitute exceeds the 200 V requirement, providing additional design margin for applications operating at or below 200 V.

Compliance and Certification: Both parts are RoHS3 compliant and carry MSL 1 (Unlimited) ratings, meeting identical environmental and moisture sensitivity requirements. The substitute is manufactured by STMicroelectronics, an active producer with established supply chain availability.

Product Status: The CUD10-02 BK is obsolete with limited remaining inventory. The STTH1003SB-TR is in active production status, ensuring long-term availability and supply continuity.

Design Considerations: The substitute exhibits a higher forward voltage drop (1.3 V versus 950 mV at 10 A), which may result in increased power dissipation in high-current applications. Thermal analysis is required if the original design operated near maximum junction temperature limits.

Frequently Asked Questions (FAQ)

Q: Can the STTH1003SB-TR directly replace the CUD10-02 BK without PCB modifications?

A: Yes. Both components use the TO-252-3 DPAK package with identical pinout configuration (2 Leads + Tab). Direct PCB footprint compatibility is confirmed, requiring no layout changes.

Q: What is the significance of the higher 300 V reverse voltage rating on the substitute?

A: The STTH1003SB-TR is rated for 300 V maximum reverse voltage, compared to 200 V for the original part. This higher rating is acceptable for applications requiring 200 V or lower operation and provides additional design margin. No circuit modifications are necessary.

Q: How does the higher forward voltage drop of the substitute affect circuit performance?

A: The STTH1003SB-TR exhibits 1.3 V forward voltage drop at 10 A, compared to 950 mV for the CUD10-02 BK. This 350 mV difference results in increased power dissipation. Thermal analysis is required for applications operating at maximum current to confirm that junction temperature remains within acceptable limits.

Q: Are both parts RoHS3 compliant?

A: Yes. Both the CUD10-02 BK and STTH1003SB-TR are RoHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity ratings, meeting identical environmental and handling requirements.

Q: What is the availability status of each part?

A: The CUD10-02 BK is classified as obsolete. The STTH1003SB-TR is in active production status with established supply chain availability through STMicroelectronics.

Q: Are the reverse recovery time specifications identical?

A: Yes. Both components specify 35 ns reverse recovery time and are classified as fast recovery diodes with speed ≤ 500 ns for currents > 200 mA, maintaining identical switching performance characteristics.

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