CDST-99-G Equivalent & Substitute Parts

Part Overview

The CDST-99-G is a general-purpose diode array manufactured by Comchip Technology, configured as 1 pair series connection with 70 V reverse voltage rating and 200 mA average rectified current per diode. The device is packaged in SOT-23-3 (TO-236-3, SC-59) surface mount configuration. This part is classified as obsolete, necessitating identification of active equivalent and substitute components for ongoing design requirements and procurement continuity.

Substiute Parts

CDST-99-G

Comchip TechnologyIn Stock: 1396CDST-99-G Datasheet

Current PartRFQ

BAV99-HF

Comchip TechnologyIn Stock: 16042BAV99-HF Datasheet

MFR RecommendedRFQ

CDST-99-HF

Comchip TechnologyIn Stock: 854CDST-99-HF Datasheet

Parametric EquivalentRFQ

BAV99 RFG

Taiwan Semiconductor CorporationIn Stock: 34017BAV99 RFG Datasheet

MFR RecommendedRFQ

BAV99_R1_00001

Panjit International Inc.In Stock: 3326BAV99_R1_00001 Datasheet

MFR RecommendedRFQ

SBAV199LT1G

onsemiIn Stock: 35310SBAV199LT1G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

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

Primary Compatibility Criteria:

• Diode configuration: 1 pair series connection
• Package type: SOT-23-3 (TO-236-3, SC-59) surface mount
• Voltage - DC Reverse (Vr) (Max): 70 V minimum
• Current - Average Rectified (Io) (per Diode): 200 mA minimum
• Voltage - Forward (Vf) (Max) @ If: 1.25 V @ 150 mA maximum
• Reverse Recovery Time (trr): 6 ns maximum
• Current - Reverse Leakage @ Vr: 2.5 µA @ 70 V maximum
• Operating Temperature - Junction (Max): 150°C minimum
• RoHS3 Compliance: Required
• MSL Rating: 1 (Unlimited)

Substitute parts are classified into two categories:

MFR Recommended Substitutes: Parts meeting all primary compatibility criteria with active product status and manufacturer endorsement.

Parametric Equivalents: Parts meeting all primary compatibility criteria with identical electrical specifications to the main part.

Parts with parameter deviations (higher voltage ratings, lower current ratings, or different speed classifications) are included only when all critical parameters remain within acceptable ranges for direct substitution.

Parameter Comparison

Engineering Selection Recommendations

BAV99-HF (Comchip Technology): This MFR recommended substitute is the primary choice for CDST-99-G replacement. It maintains identical electrical specifications (70 V, 200 mA, 1.25 V forward voltage, 6 ns recovery time) and is classified as active with high inventory availability (15,990 pcs). RoHS3 compliance and MSL 1 rating are confirmed. The fast recovery speed classification represents an enhancement over the original small signal classification, providing improved performance characteristics while maintaining full backward compatibility.

CDST-99-HF (Comchip Technology): This parametric equivalent offers identical electrical specifications to the CDST-99-G and is sourced from the same manufacturer. Product status is active with 787 pcs in stock. This option is suitable when maintaining the original manufacturer source is a design requirement. Electrical performance is equivalent to the main part.

BAV99 RFG (Taiwan Semiconductor Corporation): This MFR recommended substitute meets all critical parameters with 70 V reverse voltage and 200 mA current rating. Product status is active with substantial inventory (33,933 pcs). Operating temperature range extends to -55°C, providing enhanced low-temperature performance. RoHS3 and MSL 1 compliance are confirmed.

BAV99_R1_00001 (Panjit International Inc.): This MFR recommended substitute has a higher reverse voltage rating (75 V) and lower current rating (150 mA) compared to the CDST-99-G. This part is suitable only for applications where the 200 mA current requirement can be reduced or where the higher voltage rating is beneficial. Product status is active with 3,300 pcs available.

SBAV199LT1G (onsemi): This MFR recommended substitute maintains the 70 V reverse voltage and exceeds the current rating (215 mA). However, the reverse recovery time specification differs significantly (3 µs versus 6 ns), indicating standard recovery speed classification versus small signal classification. This part is suitable for applications where the extended recovery time does not impact circuit performance. Product status is active with high inventory (35,200 pcs). Operating temperature range extends to -65°C.

Recommendation Priority:

1. BAV99-HF for direct replacement with performance enhancement
2. CDST-99-HF for same-manufacturer continuity
3. BAV99 RFG for extended temperature range applications
4. SBAV199LT1G for applications tolerating standard recovery speed
5. BAV99_R1_00001 only when current reduction is acceptable

Frequently Asked Questions (FAQ)

Q: Can BAV99-HF directly replace CDST-99-G without circuit modification?

A: Yes. BAV99-HF maintains identical voltage (70 V), current (200 mA), forward voltage (1.25 V @ 150 mA), and reverse recovery time (6 ns) specifications. The fast recovery speed classification represents an enhancement. Pin configuration and SOT-23-3 package are identical. No circuit modification is required.

Q: What is the difference between CDST-99-HF and BAV99-HF?

A: Both parts are manufactured by Comchip Technology with identical electrical specifications. CDST-99-HF maintains the original CDST-99 base product number, while BAV99-HF uses the BAV99 base product number. Selection between these parts depends on manufacturer source preference and inventory availability.

Q: Why does SBAV199LT1G have a different reverse recovery time (3 µs)?

A: SBAV199LT1G is classified as standard recovery speed (>500ns, > 200mA), whereas CDST-99-G is classified as small signal (≤200mA, any speed). The 3 µs recovery time reflects this different speed classification. This part is suitable only for applications where extended recovery time does not degrade circuit performance.

Q: Is BAV99_R1_00001 suitable as a direct replacement?

A: BAV99_R1_00001 has a lower average rectified current rating (150 mA versus 200 mA) and higher reverse voltage (75 V versus 70 V). This part is suitable only when the circuit current requirement is 150 mA or less. The higher voltage rating does not provide additional benefit for 70 V applications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (BAV99-HF, CDST-99-HF, BAV99 RFG, BAV99_R1_00001, SBAV199LT1G) are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating. REACH status is unaffected for all parts.

Q: What is the inventory status of substitute parts?

A: BAV99-HF: 15,990 pcs; CDST-99-HF: 787 pcs; BAV99 RFG: 33,933 pcs; BAV99_R1_00001: 3,300 pcs; SBAV199LT1G: 35,200 pcs. All parts are classified as new original stock.

Q: Can I use SBAV199LT1G in a high-speed switching application?

A: SBAV199LT1G is classified as standard recovery speed with 3 µs recovery time, making it unsuitable for high-speed switching applications requiring fast recovery characteristics. BAV99-HF with 6 ns recovery time is the appropriate choice for such applications.

Q: Are the package designations SOT-23 and SOT-23-3 interchangeable?

A: SOT-23-3 and SOT-23 refer to the same three-lead surface mount package (TO-236-3, SC-59). Both designations are used interchangeably in industry documentation. All listed substitute parts are compatible with SOT-23-3 footprints.

Q: What is the operating temperature range for CDST-99-G?

A: CDST-99-G specifies a maximum junction temperature of 150°C. Substitute parts BAV99 RFG and BAV99_R1_00001 extend the operating range to -55°C, while SBAV199LT1G extends to -65°C. These extended ranges provide additional design flexibility for temperature-sensitive applications.