CDST-99-HF Equivalent & Substitute Parts

Part Overview

The CDST-99-HF is a general-purpose diode array manufactured by Comchip Technology, configured as 1 pair series connection in a surface mount SOT-23-3 package. This component is rated for 70 V DC reverse voltage with 200 mA average rectified current per diode and is currently in active production status with 787 pieces in stock.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained within the specified parameter ranges. The CDST-99-HF operates as a small signal diode with reverse recovery time of 6 ns, making it suitable for high-frequency switching applications.

Substiute Parts

CDST-99-HF

Comchip TechnologyIn Stock: 854CDST-99-HF Datasheet

Current PartRFQ

SBAV199LT1G

onsemiIn Stock: 35310SBAV199LT1G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CDST-99-HF is determined by the following critical parameters:

Electrical Compatibility Requirements:

• Voltage - DC Reverse (Vr) (Max): Must equal or exceed 70 V
• Current - Average Rectified (Io) (per Diode): Must equal or exceed 200 mA
• Voltage - Forward (Vf) (Max) @ If: Must not exceed 1.25 V @ 150 mA
• Diode Configuration: Must be 1 Pair Series Connection

Mechanical Compatibility Requirements:

• Package / Case: Must be TO-236-3, SC-59, or SOT-23-3
• Mounting Type: Must be Surface Mount

Compliance Requirements:

• RoHS Status: Must be ROHS3 Compliant
• Product Status: Must be Active

The SBAV199LT1G meets all substitution criteria with equivalent reverse voltage (70 V), higher current rating (215 mA), matching forward voltage specification (1.25 V @ 150 mA), identical package type (SOT-23-3), and active product status with ROHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

SBAV199LT1G (onsemi) as Primary Substitute:

The SBAV199LT1G is qualified as a direct substitute for the CDST-99-HF based on matching electrical specifications and mechanical compatibility. Both components are ROHS3 compliant, active production status, and identical SOT-23-3 package configuration.

The SBAV199LT1G provides equal or superior performance in all critical parameters: reverse voltage rating (70 V), forward voltage (1.25 V @ 150 mA), and current capacity (215 mA exceeds the 200 mA requirement). The substitute component demonstrates lower reverse leakage current (5 nA versus 2.5 µA) and extended operating temperature range (-65°C to 150°C versus 150°C maximum).

The difference in reverse recovery time (3 µs for SBAV199LT1G versus 6 ns for CDST-99-HF) reflects different speed classifications. The SBAV199LT1G is classified as standard recovery (>500 ns, >200 mA), while the CDST-99-HF is classified as small signal (≤200 mA). This distinction does not preclude substitution in applications where the original part's small signal classification was not a critical design requirement.

Both components maintain identical package footprint and pinout, enabling direct PCB-level replacement without layout modification.

Frequently Asked Questions (FAQ)

Q: Can SBAV199LT1G replace CDST-99-HF in all applications?

A: SBAV199LT1G meets all electrical and mechanical substitution criteria. However, applications requiring the small signal speed classification (6 ns reverse recovery time) of the CDST-99-HF should be evaluated against the standard recovery speed (3 µs) of the SBAV199LT1G. In high-frequency switching circuits where reverse recovery time is critical to performance, the substitute may not be suitable.

Q: Are the packages physically identical?

A: Yes. Both CDST-99-HF and SBAV199LT1G use the TO-236-3 / SC-59 / SOT-23-3 surface mount package with identical pinout and footprint. Direct PCB replacement is possible without layout changes.

Q: What is the difference in current rating between these parts?

A: The CDST-99-HF is rated for 200 mA average rectified current per diode, while the SBAV199LT1G is rated for 215 mA. The substitute provides 7.5% higher current capacity, making it suitable for applications requiring the original part's current specification.

Q: Do both parts meet the same compliance standards?

A: Yes. Both CDST-99-HF and SBAV199LT1G are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99. Both components carry MSL 1 (Unlimited) moisture sensitivity rating.

Q: What is the significance of reverse recovery time difference?

A: The CDST-99-HF has 6 ns reverse recovery time (small signal classification), while SBAV199LT1G has 3 µs (standard recovery classification). Reverse recovery time affects switching speed in high-frequency applications. Applications operating below the frequency threshold where this parameter becomes critical will not be affected by this difference.

Q: Can I use SBAV199LT1G in a circuit designed for CDST-99-HF?

A: SBAV199LT1G is electrically and mechanically compatible with CDST-99-HF. Substitution is valid provided the application does not depend on the small signal speed classification of the original part. Verify that the standard recovery speed of the substitute does not degrade circuit performance in your specific application.