UGF12J Equivalent & Substitute Parts

Part Overview

The UGF12J is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 600 V DC reverse voltage and 12 A average rectified current in a through-hole TO-220-2 Full Pack configuration. This component is classified as Active product status and complies with ROHS3 and REACH standards. Equivalent and substitute parts are identified when design requirements necessitate alternative sourcing, higher current ratings, automotive qualification, or different manufacturer availability while maintaining electrical and mechanical compatibility within specified parameters.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	600	V
Current - Average Rectified (Io)	12	A
Voltage - Forward (Vf) (Max) @ If	2	V @ 12 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	-
Reverse Recovery Time (trr)	20	ns
Current - Reverse Leakage @ Vr	5	µA @ 600 V
Operating Temperature - Junction	-55 to 150	°C
Mounting Type	Through Hole	-
Package / Case	TO-220-2 Full Pack	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitute parts for the UGF12J are classified based on electrical parameter compatibility and mechanical interchangeability. The primary substitution criteria are:

Parametric Equivalents: Parts with identical or superior electrical ratings across all critical parameters (voltage, current, forward voltage, recovery time, leakage current) and matching package configuration (TO-220-2 Full Pack, through-hole mounting).

Similar Substitutes: Parts with the same reverse voltage rating (600 V) and fast recovery technology but with variations in current rating, forward voltage characteristics, or recovery time. These parts maintain mechanical compatibility but operate at different current levels or thermal characteristics.

The following parameters determine substitution validity:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 600 V
Mounting Type: Must be Through Hole
Package / Case: Must be TO-220-2 Full Pack or compatible variant
Technology: Must be Standard with Fast Recovery characteristics
RoHS Status: Must maintain ROHS3 Compliance

Parameter Comparison

Parameter	UGF12J	UGF12JH	BYC20X-600PQ	VS-ETL1506FP-M3
Manufacturer	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation	WeEn Semiconductors	Vishay General Semiconductor - Diodes Division
Voltage - DC Reverse (Vr) (Max)	600 V	600 V	600 V	600 V
Current - Average Rectified (Io)	12 A	12 A	20 A	15 A
Voltage - Forward (Vf) (Max) @ If	2 V @ 12 A	2 V @ 12 A	2.5 V @ 20 A	1.07 V @ 15 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr)	20 ns	20 ns	35 ns	210 ns
Current - Reverse Leakage @ Vr	5 µA @ 600 V	5 µA @ 600 V	10 µA @ 600 V	15 µA @ 600 V
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-2 Full Pack	TO-220-2 Full Pack	TO-220-2 Full Pack, Isolated Tab	TO-220-2 Full Pack
Operating Temperature - Junction	-55 to 150°C	-55 to 150°C	Max 175°C	-65 to 175°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active
Qualification	-	AEC-Q101	-	-

Engineering Selection Recommendations

UGF12JH (Parametric Equivalent): This part is a direct parametric equivalent to the UGF12J, manufactured by Taiwan Semiconductor Corporation with identical electrical specifications. The UGF12JH carries AEC-Q101 automotive qualification, making it suitable for applications requiring automotive-grade components. Both parts maintain identical voltage, current, and recovery time characteristics. Selection of UGF12JH is appropriate when automotive qualification is a design requirement or when sourcing from the same manufacturer is preferred.

BYC20X-600PQ (Similar Substitute - Higher Current Rating): This WeEn Semiconductors part maintains the 600 V reverse voltage rating and fast recovery technology but is rated for 20 A average rectified current compared to the 12 A rating of the UGF12J. The forward voltage is 2.5 V at 20 A, and reverse recovery time is 35 ns. The BYC20X-600PQ features an isolated tab variant of the TO-220-2 Full Pack. This part is suitable for applications requiring higher current capacity within the same voltage class and package form factor.

VS-ETL1506FP-M3 (Similar Substitute - Mid-Range Current Rating): This Vishay General Semiconductor part is rated for 15 A average rectified current at 600 V reverse voltage. The forward voltage is 1.07 V at 15 A, representing lower forward voltage drop compared to the UGF12J. The reverse recovery time is 210 ns, which is longer than the UGF12J. The operating temperature range extends to 175°C maximum junction temperature. This part is suitable for applications requiring moderate current increase with improved forward voltage characteristics.

All substitute parts maintain ROHS3 compliance and through-hole TO-220-2 Full Pack mounting compatibility. Selection should be based on specific circuit current requirements, thermal management capabilities, and any automotive qualification mandates.

Frequently Asked Questions (FAQ)

Q: Can the UGF12JH be used as a direct replacement for the UGF12J?

A: Yes. The UGF12JH is a parametric equivalent with identical electrical specifications: 600 V reverse voltage, 12 A current rating, 2 V forward voltage at 12 A, and 20 ns reverse recovery time. Both parts use the same TO-220-2 Full Pack through-hole package. The primary difference is that UGF12JH carries AEC-Q101 automotive qualification.

Q: What is the difference between the UGF12J and BYC20X-600PQ?

A: The BYC20X-600PQ is rated for 20 A average rectified current versus 12 A for the UGF12J, while maintaining the same 600 V reverse voltage rating. The forward voltage is higher at 2.5 V (compared to 2 V), and the reverse recovery time is longer at 35 ns (compared to 20 ns). Both use through-hole TO-220-2 Full Pack mounting. The BYC20X-600PQ is suitable for higher current applications.

Q: Is the VS-ETL1506FP-M3 compatible with the UGF12J in terms of package and mounting?

A: Yes. The VS-ETL1506FP-M3 uses the same TO-220-2 Full Pack through-hole mounting configuration as the UGF12J. However, it is rated for 15 A average rectified current (versus 12 A) and features a lower forward voltage of 1.07 V at 15 A. The reverse recovery time is significantly longer at 210 ns compared to 20 ns for the UGF12J.

Q: What are the key parameters that determine if a part can substitute for the UGF12J?

A: The critical parameters are: (1) Voltage - DC Reverse rating must be 600 V or higher, (2) Mounting Type must be Through Hole, (3) Package must be TO-220-2 Full Pack or compatible variant, (4) Technology must be Standard with Fast Recovery characteristics, and (5) RoHS Status must maintain ROHS3 Compliance. Current rating, forward voltage, and recovery time may vary depending on application requirements.

Q: Can I use a substitute part with a higher current rating in place of the UGF12J?

A: Yes, provided the application circuit design accommodates the different electrical characteristics. Parts with higher current ratings (such as BYC20X-600PQ at 20 A or VS-ETL1506FP-M3 at 15 A) can be used in circuits designed for the 12 A UGF12J, as they maintain the same 600 V reverse voltage rating and through-hole package compatibility. However, forward voltage and recovery time differences must be evaluated for the specific application.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts (UGF12JH, BYC20X-600PQ, and VS-ETL1506FP-M3) maintain ROHS3 Compliance status, matching the compliance level of the UGF12J.

Q: What is the significance of the isolated tab variant in the BYC20X-600PQ?

A: The BYC20X-600PQ features an isolated tab variant of the TO-220-2 Full Pack. This means the tab is electrically isolated from the diode terminals, which may be required in certain circuit configurations where the mounting tab must not be connected to either terminal. The standard UGF12J does not specify this isolation feature.

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