UG12HT-E3/45 Equivalent & Substitute Parts

Part Overview

The UG12HT-E3/45 is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 500 V DC reverse voltage and 12 A average rectified current in a Through Hole TO-220AC package. This component is classified as Obsolete, necessitating identification of equivalent substitute parts for ongoing design requirements and procurement needs. Substitute parts must maintain electrical and mechanical compatibility while meeting current product availability and compliance standards.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	500 V
Current - Average Rectified (Io)	12 A
Voltage - Forward (Vf) (Max) @ If	1.75 V @ 12 A
Reverse Recovery Time (trr)	50 ns
Current - Reverse Leakage @ Vr	30 µA @ 500 V
Mounting Type	Through Hole
Package / Case	TO-220-2
Operating Temperature - Junction (Max)	150°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the UG12HT-E3/45 are selected based on the following electrical and mechanical compatibility criteria:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) rating must equal or exceed 500 V
Current - Average Rectified (Io) rating must equal or exceed 12 A
Mounting Type must be Through Hole
Package / Case must be TO-220-2 (TO-220AC supplier device package)
Technology classification must be Standard
Speed classification must be Fast Recovery (≤ 500ns, > 200mA)

Secondary Compliance Criteria:

RoHS3 Compliance required
Moisture Sensitivity Level (MSL) of 1 (Unlimited) preferred
REACH Unaffected status preferred

Parts meeting these criteria are electrically and mechanically interchangeable within the specified application envelope.

Parameter Comparison

Parameter	UG12HT-E3/45	VS-ETH1506-M3	STTH12R06D
Manufacturer	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	STMicroelectronics
Voltage - DC Reverse (Vr) (Max)	500 V	600 V	600 V
Current - Average Rectified (Io)	12 A	15 A	12 A
Voltage - Forward (Vf) (Max) @ If	1.75 V @ 12 A	2.45 V @ 15 A	2.9 V @ 12 A
Reverse Recovery Time (trr)	50 ns	29 ns	45 ns
Current - Reverse Leakage @ Vr	30 µA @ 500 V	15 µA @ 600 V	45 µA @ 600 V
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-2	TO-220-2	TO-220-2
Operating Temperature - Junction (Max)	150°C	175°C	175°C
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

VS-ETH1506-M3 (Vishay General Semiconductor - Diodes Division): This substitute provides enhanced electrical performance with 600 V reverse voltage rating and 15 A current capacity, exceeding the original UG12HT-E3/45 specifications. The part is Active status with current manufacturing support. Operating temperature range extends to 175°C, providing improved thermal margin. Reverse recovery time of 29 ns represents faster switching performance. RoHS3 compliance and REACH Unaffected status are maintained. This part is suitable for applications requiring direct replacement with performance headroom.

STTH12R06D (STMicroelectronics): This substitute maintains the 12 A current rating of the original part while providing 600 V reverse voltage rating. The part is Active status with high inventory availability (31,400 pcs). Operating temperature maximum of 175°C exceeds the original specification. Reverse recovery time of 45 ns is comparable to the original 50 ns specification. RoHS3 compliance and REACH Unaffected status are maintained. This part is suitable for direct current-matched replacement with voltage margin improvement.

Both substitute parts satisfy the mandatory electrical and mechanical compatibility requirements for the UG12HT-E3/45 and are available from active manufacturing sources.

Frequently Asked Questions (FAQ)

Q: Can VS-ETH1506-M3 be used as a direct replacement for UG12HT-E3/45?

A: Yes. The VS-ETH1506-M3 meets all mandatory substitution criteria: TO-220-2 package, Through Hole mounting, Fast Recovery technology, 600 V reverse voltage (exceeds 500 V requirement), and 15 A current capacity (exceeds 12 A requirement). Both parts are RoHS3 compliant with MSL 1 rating.

Q: Can STTH12R06D be used as a direct replacement for UG12HT-E3/45?

A: Yes. The STTH12R06D meets all mandatory substitution criteria: TO-220-2 package, Through Hole mounting, Fast Recovery technology, 600 V reverse voltage (exceeds 500 V requirement), and 12 A current capacity (matches original specification). Both parts are RoHS3 compliant with MSL 1 rating.

Q: What is the primary difference between the two substitute parts?

A: VS-ETH1506-M3 provides higher current capacity (15 A vs. 12 A) and faster reverse recovery time (29 ns vs. 45 ns). STTH12R06D maintains the original 12 A current rating with comparable reverse recovery performance. Both provide 600 V reverse voltage rating.

Q: Are there package or mounting differences between the original and substitute parts?

A: No. All three parts use identical TO-220-2 package configuration with Through Hole mounting type, ensuring mechanical compatibility in existing PCB designs.

Q: Do the substitute parts maintain compliance certifications?

A: Yes. Both VS-ETH1506-M3 and STTH12R06D are RoHS3 compliant, REACH Unaffected, and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the original UG12HT-E3/45 compliance profile.

Q: What is the impact of higher forward voltage in STTH12R06D?

A: The STTH12R06D forward voltage of 2.9 V @ 12 A exceeds the original 1.75 V @ 12 A specification. This parameter affects power dissipation and thermal performance in the application circuit and must be evaluated against thermal design margins.

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