UG18DCTHE3/45 Equivalent & Substitute Parts

Part Overview

The UG18DCTHE3/45 is a general-purpose diode array featuring a 1 pair common cathode configuration rated for 200 V DC reverse voltage and 18 A average rectified current per diode. Manufactured by Vishay General Semiconductor - Diodes Division, this component is packaged in a Through Hole TO-220-3 format and qualified to AEC-Q101 automotive standards.

The UG18DCTHE3/45 is classified as obsolete. Locating equivalent or substitute parts is necessary to support ongoing production requirements, maintenance operations, and design continuity where this component is specified in existing applications.

Substiute Parts

UG18DCTHE3/45

Vishay General Semiconductor - Diodes DivisionIn Stock: 882UG18DCTHE3/45 Datasheet

Current PartRFQ

STTH1602CT

STMicroelectronicsIn Stock: 44259STTH1602CT Datasheet

MFR RecommendedRFQ

UGF2004GHC0G

Taiwan Semiconductor CorporationIn Stock: 702UGF2004GHC0G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the UG18DCTHE3/45 is determined by the following critical parameters:

Mandatory Matching Criteria:

• Diode Configuration: 1 Pair Common Cathode
• Voltage - DC Reverse (Vr) (Max): 200 V
• Mounting Type: Through Hole
• Package / Case: TO-220-3 or compatible variant

Allowable Variation Criteria:

• Current - Average Rectified (Io): Substitute parts must meet or exceed 18 A per diode
• Voltage - Forward (Vf): Substitute parts must not exceed 1.1 V @ rated current
• Reverse Recovery Time (trr): Substitute parts must support fast recovery characteristics
• Operating Temperature Range: Substitute parts must support the application's thermal requirements
• Product Status: Active parts are preferred for long-term availability

Two substitute parts meet these criteria and are presented below.

Parameter Comparison

Engineering Selection Recommendations

STTH1602CT (STMicroelectronics)

The STTH1602CT is an active product with identical voltage rating and diode configuration. This part carries a lower current rating of 10 A per diode compared to the 18 A specification of the UG18DCTHE3/45. The STTH1602CT is suitable for applications where the actual operating current does not exceed 10 A per diode. This part is not qualified to AEC-Q101 and carries a standard grade classification, making it appropriate for non-automotive applications or where automotive qualification is not required. The part is available in high inventory volume (44,200 pcs).

UGF2004GHC0G (Taiwan Semiconductor Corporation)

The UGF2004GHC0G is an active product with identical voltage rating and diode configuration. This part exceeds the current rating of the UG18DCTHE3/45 with a 20 A per diode specification, providing margin for applications requiring the full 18 A capability. The UGF2004GHC0G carries AEC-Q101 automotive qualification and automotive grade classification, matching the compliance profile of the original part. The package variant is TO-220-3 Full Pack with Isolated Tab (ITO-220AB), which provides electrical isolation of the tab from the common cathode. This configuration is directly compatible with applications requiring isolated tab functionality. The operating temperature range extends to 175°C maximum junction temperature, exceeding the original part's 150°C upper limit.

Frequently Asked Questions (FAQ)

Q: Can the STTH1602CT replace the UG18DCTHE3/45 in all applications?

A: The STTH1602CT is suitable only for applications where the actual operating current per diode does not exceed 10 A. If the application requires the full 18 A capability of the original part, the STTH1602CT is not appropriate. Additionally, the STTH1602CT lacks AEC-Q101 qualification, limiting its use in automotive applications requiring this certification.

Q: What is the difference between the UGF2004GHC0G and the UG18DCTHE3/45?

A: Both parts share identical voltage ratings (200 V), diode configuration (1 Pair Common Cathode), and mounting type (Through Hole TO-220-3). The UGF2004GHC0G provides a higher current rating (20 A vs. 18 A per diode), lower forward voltage drop (950 mV vs. 1.1 V), faster reverse recovery time (20 ns vs. 30 ns), and maintains AEC-Q101 automotive qualification. The UGF2004GHC0G package includes an isolated tab feature (ITO-220AB variant), which may require verification against the original application's PCB layout and thermal management design.

Q: Is the isolated tab on the UGF2004GHC0G compatible with my existing design?

A: The isolated tab feature (ITO-220AB) electrically isolates the tab from the common cathode connection. If the original UG18DCTHE3/45 design uses a standard TO-220-3 package with a connected tab, the isolated tab variant requires confirmation that the PCB layout and thermal management strategy do not depend on tab-to-cathode electrical continuity. Physical dimensions and mounting hole spacing remain compatible with standard TO-220-3 footprints.

Q: Why is the UG18DCTHE3/45 classified as obsolete?

A: The UG18DCTHE3/45 is no longer in active production by Vishay General Semiconductor - Diodes Division. Existing inventory is limited (847 pcs). Active substitute parts with equivalent or superior electrical characteristics are available from alternative manufacturers to support continued system production and maintenance.

Q: Are both substitute parts RoHS3 compliant?

A: Yes. Both the STTH1602CT and UGF2004GHC0G are ROHS3 compliant, matching the compliance status of the original UG18DCTHE3/45.

Q: Which substitute part should I select for a new automotive design?

A: The UGF2004GHC0G is the appropriate selection for new automotive designs. It carries AEC-Q101 qualification and automotive grade classification, matching the original part's compliance requirements. The higher current rating (20 A) and improved electrical characteristics (lower forward voltage, faster recovery time) provide design margin and performance enhancement.