UG18ACT-E3/45 Equivalent & Substitute Parts

Part Overview

The UG18ACT-E3/45 is a diode array rectifier manufactured by Vishay General Semiconductor - Diodes Division, configured as a 1 Pair Common Cathode design rated for 50 V DC reverse voltage and 18 A average rectified current per diode. The device is packaged in a Through Hole TO-220-3 case and features fast recovery characteristics with a 30 ns reverse recovery time.

This part is classified as Obsolete, necessitating identification of equivalent and substitute components for ongoing design requirements and procurement needs. Active alternative parts are available that maintain functional compatibility within specified electrical and mechanical parameters.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io) (per Diode)	18	A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 9 A	V @ A
Reverse Recovery Time (trr)	30	ns
Current - Reverse Leakage @ Vr	10	µA @ 50 V
Diode Configuration	1 Pair Common Cathode	—
Mounting Type	Through Hole	—
Package / Case	TO-220-3	—
Operating Temperature - Junction	-65°C ~ 150°C	°C
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the UG18ACT-E3/45 are evaluated based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 50 V
Current - Average Rectified (Io): Must equal or exceed 18 A per diode
Diode Configuration: Must maintain 1 Pair Common Cathode topology
Mounting Type: Must be Through Hole
Package / Case: Must be TO-220-3 or compatible TO-220 variant
Speed Classification: Must maintain Fast Recovery characteristics (≤ 500ns, > 200mA)
Operating Temperature Range: Must support junction operation within specified limits
RoHS Compliance: Must maintain ROHS3 Compliant status

Substitute Classification:

Group 1 - Direct Functional Equivalent (Active Status): The SF2001GHC0G meets or exceeds all primary compatibility criteria with enhanced current rating (20 A vs. 18 A) and improved reverse leakage characteristics. This part is classified as Active with Automotive grade qualification (AEC-Q101).

Group 2 - Voltage-Elevated Substitute (Active Status): The STTH1602CT maintains the 1 Pair Common Cathode configuration and TO-220-3 package but operates at elevated voltage rating (200 V vs. 50 V). Current rating is reduced to 10 A per diode, making this substitute suitable only for applications where voltage margin is prioritized over current capacity.

Parameter Comparison

Parameter	UG18ACT-E3/45 (Main)	SF2001GHC0G (Substitute)	STTH1602CT (Substitute)
Manufacturer	Vishay General Semiconductor	Taiwan Semiconductor Corporation	STMicroelectronics
Product Status	Obsolete	Active	Active
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	200 V
Current - Average Rectified (Io) (per Diode)	18 A	20 A	10 A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 9 A	975 mV @ 10 A	1.1 V @ 8 A
Reverse Recovery Time (trr)	30 ns	35 ns	26 ns
Current - Reverse Leakage @ Vr	10 µA @ 50 V	5 µA @ 50 V	6 µA @ 200 V
Diode Configuration	1 Pair Common Cathode	Single Diode	1 Pair Common Cathode
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-3	TO-220AB	TO-220-3
Operating Temperature - Junction	-65°C ~ 150°C	-55°C ~ 150°C	Max 175°C
Speed Classification	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Inventory Status	814 Pcs New Original	797 Pcs New Original	44200 Pcs New Original

Engineering Selection Recommendations

SF2001GHC0G Selection Criteria:

The SF2001GHC0G is recommended as the primary substitute for the UG18ACT-E3/45 in applications requiring direct functional replacement. This part maintains the 50 V voltage rating and exceeds the 18 A current requirement with a 20 A rating. The device is classified as Active with Automotive grade qualification (AEC-Q101), ensuring long-term availability and supply chain stability. Forward voltage characteristics are improved (975 mV @ 10 A vs. 1.1 V @ 9 A), and reverse leakage is reduced to 5 µA @ 50 V. The TO-220AB package is mechanically compatible with TO-220-3 footprints. ROHS3 compliance is maintained.

STTH1602CT Selection Criteria:

The STTH1602CT is suitable as a substitute only in applications where the 50 V voltage requirement can be exceeded without circuit impact. This part maintains the 1 Pair Common Cathode configuration and TO-220-3 package, ensuring mechanical and electrical interface compatibility. However, the reduced current rating (10 A per diode vs. 18 A) restricts its use to lower-current applications. The elevated voltage rating (200 V) provides additional design margin for transient protection. This part is classified as Active with extensive inventory availability (44200 Pcs). ROHS3 compliance is maintained.

Compliance Considerations:

Both substitute parts maintain ROHS3 compliance, Moisture Sensitivity Level 1 (Unlimited), and REACH Unaffected status, matching the regulatory profile of the original UG18ACT-E3/45. Both are classified as Through Hole mounting devices suitable for PCB assembly processes compatible with the original design.

Frequently Asked Questions (FAQ)

Q: Can the SF2001GHC0G directly replace the UG18ACT-E3/45 in existing designs?

A: The SF2001GHC0G maintains electrical compatibility at the 50 V / 18+ A operating point. The TO-220AB package is mechanically compatible with TO-220-3 footprints. However, the SF2001GHC0G is a single diode configuration, whereas the UG18ACT-E3/45 is a 1 Pair Common Cathode array. Circuit topology must be evaluated to confirm compatibility with the single-diode configuration.

Q: What is the key difference between the SF2001GHC0G and STTH1602CT substitutes?

A: The SF2001GHC0G maintains the 50 V voltage rating with enhanced 20 A current capacity, suitable for direct current-level replacement. The STTH1602CT provides elevated voltage rating (200 V) but reduced current capacity (10 A), making it suitable only for applications where voltage margin is required and current demand is lower than the original 18 A specification.

Q: Is the STTH1602CT suitable for 18 A applications?

A: No. The STTH1602CT is rated for 10 A average rectified current per diode, which is below the UG18ACT-E3/45 requirement of 18 A. This part is suitable only for applications with current demands at or below 10 A.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both the SF2001GHC0G and STTH1602CT are ROHS3 Compliant, matching the regulatory status of the original UG18ACT-E3/45.

Q: What is the operating temperature range difference between the main part and substitutes?

A: The UG18ACT-E3/45 operates from -65°C to 150°C. The SF2001GHC0G operates from -55°C to 150°C, with a 10°C lower minimum temperature limit. The STTH1602CT specifies a maximum junction temperature of 175°C without a defined minimum. Applications requiring operation below -55°C must use the original UG18ACT-E3/45 or equivalent parts with matching temperature specifications.

Q: Does the SF2001GHC0G package compatibility affect PCB layout?

A: The SF2001GHC0G uses a TO-220AB package variant, which is mechanically compatible with TO-220-3 footprints. Pin assignments and thermal characteristics are equivalent for standard Through Hole PCB applications. No layout modifications are required for package substitution.

Q: What is the reverse recovery time difference, and does it affect circuit performance?

A: The UG18ACT-E3/45 has a 30 ns reverse recovery time. The SF2001GHC0G has 35 ns, and the STTH1602CT has 26 ns. All three parts are classified as Fast Recovery (≤ 500ns, > 200mA). The 5-9 ns variation is within the Fast Recovery classification and does not affect standard rectifier circuit performance.

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