ZHCS500QTA Equivalent & Substitute Parts

Part Overview

The ZHCS500QTA is an active Schottky rectifier diode manufactured by Diodes Incorporated, designed for surface mount applications in the SOT-23-3 package. This component operates at a maximum reverse voltage of 40 V with an average rectified current rating of 1 A and features fast recovery characteristics with a reverse recovery time of 10 ns. The device is qualified to AEC-Q101 automotive standards and maintains RoHS3 compliance. Substitute parts are identified to provide alternative sourcing options when the primary part number becomes unavailable or when inventory constraints require component alternatives that meet equivalent electrical and mechanical specifications.

Substiute Parts

ZHCS500QTA

Diodes IncorporatedIn Stock: 12789ZHCS500QTA Datasheet

Current PartRFQ

SBAS40LT1G

onsemiIn Stock: 26812SBAS40LT1G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the ZHCS500QTA is determined by strict alignment of electrical and mechanical parameters. The primary substitution criteria are:

Mandatory Matching Parameters:

• Technology classification: Schottky diode
• Package type: SOT-23-3 (TO-236-3, SC-59)
• Mounting configuration: Surface Mount
• Voltage rating: 40 V DC reverse maximum
• RoHS compliance: ROHS3 Compliant
• Moisture sensitivity: MSL 1 (Unlimited)

Current Rating Consideration: The ZHCS500QTA is rated for 1 A average rectified current. Substitute parts must support the application's current requirements. Parts with lower current ratings (such as 120 mA) are suitable only for applications where the actual circuit current does not exceed the substitute part's maximum rating.

Recovery Characteristics: The ZHCS500QTA exhibits fast recovery characteristics (≤ 500 ns, > 200 mA). Substitute parts classified as small signal devices may have different recovery profiles and are selected based on specific application switching speed requirements.

Parameter Comparison

Engineering Selection Recommendations

SBAS40LT1G Substitution Criteria:

The SBAS40LT1G manufactured by onsemi is electrically and mechanically compatible with the ZHCS500QTA for applications where the circuit current requirement does not exceed 120 mA. Both devices share identical 40 V reverse voltage ratings, SOT-23-3 package geometry, surface mount configuration, and RoHS3 compliance status. Both components maintain MSL 1 moisture sensitivity classification and are classified as active products.

Current Rating Limitation:

The SBAS40LT1G is rated for 120 mA average rectified current, compared to the ZHCS500QTA's 1 A rating. Direct substitution is valid only when the application circuit operates within the 120 mA maximum current specification of the onsemi device. Applications requiring sustained currents above 120 mA must retain the ZHCS500QTA or identify alternative parts with higher current ratings.

Temperature Operating Range:

The SBAS40LT1G specifies an operating junction temperature range of −55°C to 150°C, providing extended low-temperature operation compared to the ZHCS500QTA's 125°C maximum junction temperature specification. This difference does not preclude substitution but should be noted for applications operating at elevated temperatures near or exceeding 125°C.

Compliance and Qualification:

Both parts maintain ROHS3 compliance and unlimited moisture sensitivity classification, ensuring compatibility with standard surface mount assembly processes and storage requirements. The ZHCS500QTA carries AEC-Q101 automotive qualification; the SBAS40LT1G qualification status is not specified in the provided parameters.

Frequently Asked Questions (FAQ)

Q: Can the SBAS40LT1G replace the ZHCS500QTA in all applications?

A: The SBAS40LT1G is a valid substitute only for applications where the circuit current does not exceed 120 mA. The ZHCS500QTA is rated for 1 A, providing significantly higher current capacity. Applications requiring sustained currents above 120 mA must use the ZHCS500QTA or identify alternative parts with equivalent or higher current ratings.

Q: Are the package dimensions identical between these two parts?

A: Both the ZHCS500QTA and SBAS40LT1G use the SOT-23-3 package (also designated TO-236-3 or SC-59). The physical dimensions and pin configurations are identical, allowing direct board-level substitution without PCB redesign.

Q: What is the difference in forward voltage characteristics?

A: The ZHCS500QTA specifies a maximum forward voltage of 550 mV at 500 mA, while the SBAS40LT1G specifies 1 V at 40 mA. These measurements are taken at different current levels and reflect the different current ratings of each device. Forward voltage characteristics should be evaluated based on the actual operating current of the application circuit.

Q: Do both parts meet automotive qualification standards?

A: The ZHCS500QTA carries AEC-Q101 automotive qualification. The SBAS40LT1G qualification status is not specified in the available technical parameters. Applications requiring automotive-grade components should confirm qualification requirements with the component supplier.

Q: Are there any differences in reverse leakage current?

A: The ZHCS500QTA exhibits 40 µA reverse leakage at 30 V, while the SBAS40LT1G exhibits 1 µA reverse leakage at 25 V. The SBAS40LT1G demonstrates lower reverse leakage characteristics. Both values are within typical Schottky diode specifications and do not preclude substitution for standard applications.

Q: What is the significance of the different capacitance ratings?

A: The ZHCS500QTA specifies 20 pF at 25 V and 1 MHz, while the SBAS40LT1G specifies 5 pF at 1 V and 1 MHz. The SBAS40LT1G exhibits lower junction capacitance. For high-frequency switching applications, the lower capacitance of the SBAS40LT1G may provide improved performance characteristics.

Q: Can these parts be used interchangeably on the same PCB assembly?

A: Yes, both parts use identical SOT-23-3 package geometry and pin configuration. PCB footprints designed for one part accommodate the other without modification. However, the current rating difference must be considered during circuit design and validation.

Q: What is the moisture sensitivity classification for both parts?

A: Both the ZHCS500QTA and SBAS40LT1G are classified as MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. These components do not require special moisture control during storage, handling, or assembly processes.