CURB206-G Equivalent & Substitute Parts Reference

Part Overview

The CURB206-G is a general-purpose rectifier diode manufactured by Comchip Technology, rated for 800 V DC reverse voltage and 2 A average rectified current in a Surface Mount DO-214AA (SMB) package. This component is classified as Active product status with fast recovery characteristics (≤500 ns). Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained across the same package form factor, enabling direct replacement in circuit applications without design modification.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	800	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	1.7 @ 2 A	V
Speed Classification	Fast Recovery ≤500 ns	-
Reverse Recovery Time (trr)	75	ns
Current - Reverse Leakage @ Vr	5 @ 800 V	µA
Package / Case	DO-214AA, SMB	-
Mounting Type	Surface Mount	-
Operating Temperature - Junction (Max)	150	°C
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution eligibility for the CURB206-G is determined by strict equivalence in the following parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 800 V (exact match required)
Current - Average Rectified (Io): 2 A (exact match required)
Package / Case: DO-214AA, SMB (exact match required)
Mounting Type: Surface Mount (exact match required)

Secondary Compatibility Factors:

Voltage - Forward (Vf) (Max) @ If: Must not exceed application circuit requirements
Speed Classification: Fast Recovery (≤500 ns) preferred for switching applications; Standard Recovery (>500 ns) acceptable for linear rectification
Reverse Recovery Time (trr): Lower values indicate faster switching capability
Current - Reverse Leakage @ Vr: Lower values indicate superior blocking characteristics
Operating Temperature - Junction: Must accommodate application thermal environment
RoHS and REACH Compliance: Must match regulatory requirements

Identified Substitutes:

S2K (Diotec Semiconductor): Meets primary criteria with 800 V, 2 A, DO-214AA SMB package. Forward voltage 1.15 V @ 2 A (lower than CURB206-G). Standard Recovery speed (>500 ns) differs from fast recovery classification. Operating temperature range -50°C to 150°C. ROHS3 compliant.

S5KB R5G (Taiwan Semiconductor Corporation): Meets voltage and package criteria (800 V, DO-214AA SMB) but current rating is 5 A, exceeding the 2 A specification. Fast Recovery speed (≤500 ns) matches CURB206-G. Product status Discontinued at DiGi Electronics. Operating temperature range -55°C to 150°C. ROHS3 compliant.

STTH208U (STMicroelectronics): Meets all primary criteria with 800 V, 2 A, DO-214AA SMB package. Forward voltage 1.65 V @ 2 A (within tolerance). Fast Recovery speed (≤500 ns) matches CURB206-G. Reverse recovery time 75 ns (identical to CURB206-G). Operating temperature maximum 175°C (higher than CURB206-G). ROHS3 compliant. Active product status.

Parameter Comparison

Parameter	CURB206-G (Comchip)	S2K (Diotec)	S5KB R5G (TSC)	STTH208U (STMicroelectronics)
Voltage - DC Reverse (Vr) (Max)	800 V	800 V	800 V	800 V
Current - Average Rectified (Io)	2 A	2 A	5 A	2 A
Voltage - Forward (Vf) (Max) @ If	1.7 V @ 2 A	1.15 V @ 2 A	1.1 V @ 5 A	1.65 V @ 2 A
Speed Classification	Fast Recovery ≤500 ns	Standard Recovery >500 ns	Fast Recovery ≤500 ns	Fast Recovery ≤500 ns
Reverse Recovery Time (trr)	75 ns	1.5 µs	Not specified	75 ns
Current - Reverse Leakage @ Vr	5 µA @ 800 V	5 µA @ 800 V	10 µA @ 800 V	5 µA @ 800 V
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Operating Temperature - Junction (Max)	150°C	150°C	150°C	175°C
Product Status	Active	Active	Discontinued at DiGi Electronics	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

STTH208U (STMicroelectronics) is the primary substitute for CURB206-G. This part maintains exact equivalence in voltage (800 V), current (2 A), and package (DO-214AA SMB). Forward voltage (1.65 V @ 2 A) and reverse recovery time (75 ns) are identical to the original part. Fast Recovery speed classification matches the CURB206-G specification. Operating temperature maximum of 175°C exceeds the CURB206-G rating of 150°C, providing thermal margin. Product status is Active with ROHS3 compliance and REACH Unaffected designation. Inventory availability is 20,300 pieces.

S2K (Diotec Semiconductor) is a secondary substitute suitable for applications where Standard Recovery speed is acceptable. This part meets voltage (800 V), current (2 A), and package (DO-214AA SMB) requirements. Forward voltage is lower at 1.15 V @ 2 A, reducing power dissipation. Reverse recovery time of 1.5 µs indicates slower switching compared to CURB206-G. Product status is Active with ROHS3 compliance. Operating temperature range extends to -50°C, providing wider thermal operation. Inventory availability is 3,535 pieces. Selection of S2K requires confirmation that Standard Recovery speed does not compromise circuit performance in switching applications.

S5KB R5G (Taiwan Semiconductor Corporation) is not recommended as a direct substitute. Although voltage (800 V) and package (DO-214AA SMB) match, the current rating of 5 A exceeds the 2 A specification of CURB206-G. This part is classified as Discontinued at DiGi Electronics, limiting long-term supply assurance. Selection of S5KB R5G is appropriate only when higher current capacity is required by circuit redesign.

Frequently Asked Questions (FAQ)

Q: Can STTH208U replace CURB206-G in existing circuit designs without modification?

A: Yes. STTH208U meets all primary substitution criteria: 800 V reverse voltage, 2 A average rectified current, and DO-214AA SMB package. Forward voltage (1.65 V @ 2 A) and reverse recovery time (75 ns) are equivalent to CURB206-G. Fast Recovery speed classification matches the original part. No circuit redesign is required.

Q: What is the difference between Fast Recovery and Standard Recovery speed classifications?

A: Fast Recovery diodes (≤500 ns) exhibit shorter reverse recovery time, enabling faster switching transitions with reduced switching losses. Standard Recovery diodes (>500 ns) have longer reverse recovery time, suitable for linear rectification and lower-frequency applications. S2K is classified as Standard Recovery (1.5 µs), while CURB206-G and STTH208U are Fast Recovery (75 ns). Selection depends on circuit switching frequency and performance requirements.

Q: Why is S5KB R5G listed as a substitute if the current rating is 5 A instead of 2 A?

A: S5KB R5G is listed in the original substitute field but does not qualify as a direct equivalent substitute due to current rating mismatch (5 A vs. 2 A). This part is appropriate only when circuit requirements are modified to utilize higher current capacity. The 5 A rating does not prevent physical installation in the same DO-214AA SMB footprint, but electrical performance differs significantly.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. CURB206-G, S2K, S5KB R5G, and STTH208U are all ROHS3 compliant. All parts meet environmental and regulatory requirements for lead-free manufacturing and restricted substance limitations.

Q: What is the impact of forward voltage differences between substitute parts?

A: Forward voltage affects power dissipation in the diode. CURB206-G: 1.7 V @ 2 A; S2K: 1.15 V @ 2 A; STTH208U: 1.65 V @ 2 A. Lower forward voltage reduces heat generation. S2K exhibits the lowest forward voltage (1.15 V), resulting in reduced power dissipation. STTH208U (1.65 V) is nearly equivalent to CURB206-G (1.7 V). Selection should consider thermal design and power budget requirements.

Q: Is operating temperature range a critical factor in substitution?

A: Operating temperature range affects component reliability in thermal environments. CURB206-G maximum junction temperature is 150°C. STTH208U maximum is 175°C, providing 25°C thermal margin. S2K operating range is -50°C to 150°C, extending low-temperature operation. S5KB R5G range is -55°C to 150°C. Selection should match application thermal environment and thermal management design.

Q: What is the significance of reverse leakage current specifications?

A: Reverse leakage current indicates blocking quality when the diode is reverse-biased. CURB206-G, S2K, and STTH208U all specify 5 µA @ 800 V, indicating equivalent blocking performance. S5KB R5G specifies 10 µA @ 800 V, indicating slightly higher leakage. Lower leakage current is preferred for precision rectification and low-current applications.

Q: Can S2K be used in high-frequency switching applications?

A: S2K is classified as Standard Recovery (>500 ns) with reverse recovery time of 1.5 µs. This classification indicates suitability for linear rectification and lower-frequency applications. For high-frequency switching applications, Fast Recovery diodes such as CURB206-G or STTH208U are preferred to minimize switching losses and electromagnetic interference. Use of S2K in high-frequency circuits requires circuit analysis to confirm acceptable performance.

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