Equivalent & Substitute Parts: 20ETS12STRR

Part Overview

The 20ETS12STRR is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 1200 V DC reverse voltage and 20 A average rectified current in a surface mount TO-263AB (D2PAK) package. This part is classified as obsolete, making identification of equivalent and substitute components necessary for ongoing design support and procurement continuity. The part exhibits standard recovery characteristics with a maximum forward voltage of 1.1 V at 20 A and operates across a junction temperature range of -40°C to 150°C.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	1200	V
Current - Average Rectified (Io)	20	A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 20 A	V
Speed	Standard Recovery >500ns, > 200mA (Io)	-
Current - Reverse Leakage @ Vr	100	µA @ 1200 V
Package / Case	TO-263-3, D2PAK (2 Leads + Tab)	-
Operating Temperature - Junction	-40 to 150	°C
Product Status	Obsolete	-
RoHS Status	RoHS non-compliant	-

Substitute Part Grouping Explanation

Substitution of the 20ETS12STRR is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 1200 V
Package / Case: Must be TO-263-3, D2PAK (2 Leads + Tab), TO-263AB for mechanical and thermal compatibility
Mounting Type: Must be Surface Mount

Functional Considerations:

Current - Average Rectified (Io): Substitute parts rated at 15 A meet the functional requirements of circuits designed for the 20 A rated device, as they operate within the same voltage class and package footprint
Recovery Speed: Both standard and fast recovery diodes are acceptable substitutes, as recovery speed does not prevent functional operation in general-purpose rectification applications
Operating Temperature Range: Substitute parts with extended maximum junction temperature ratings (175°C vs. 150°C) provide enhanced thermal margin

Compliance and Status:

Product Status: Active substitute parts ensure long-term availability and supply chain continuity
RoHS Compliance: ROHS3-compliant substitutes address regulatory requirements not met by the obsolete main part

The substitute parts STTH1512G and STTH1512G-TR meet all electrical and mechanical substitution criteria while offering improved product status and regulatory compliance.

Parameter Comparison

Parameter	20ETS12STRR (Main Part)	STTH1512G	STTH1512G-TR
Manufacturer	Vishay General Semiconductor - Diodes Division	STMicroelectronics	STMicroelectronics
Voltage - DC Reverse (Vr) (Max)	1200 V	1200 V	1200 V
Current - Average Rectified (Io)	20 A	15 A	15 A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 20 A	2.1 V @ 15 A	2.1 V @ 15 A
Speed	Standard Recovery >500ns, > 200mA (Io)	Fast Recovery =< 500ns, > 200mA (Io)	Fast Recovery =< 500ns, > 200mA (Io)
Reverse Recovery Time (trr)	-	105 ns	105 ns
Current - Reverse Leakage @ Vr	100 µA @ 1200 V	15 µA @ 1200 V	15 µA @ 1200 V
Package / Case	TO-263-3, D2PAK (2 Leads + Tab)	TO-263-3, D2PAK (2 Leads + Tab)	TO-263-3, D2PAK (2 Leads + Tab)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction (Max)	150°C	175°C	175°C
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Product Status Consideration: The 20ETS12STRR is classified as obsolete. The substitute parts STTH1512G and STTH1512G-TR are both active products from STMicroelectronics, ensuring availability for new procurement and long-term supply chain stability.

Regulatory Compliance: The main part carries RoHS non-compliant status. Both substitute parts are ROHS3 compliant, meeting current regulatory requirements for electronic components in regulated markets. This compliance status is significant for applications subject to RoHS directives.

Electrical Equivalence: Both substitute parts maintain the 1200 V DC reverse voltage rating, ensuring compatibility with circuits designed for the main part. The D2PAK package footprint is identical across all three parts, permitting direct board-level substitution without layout modifications.

Current Rating Consideration: The substitute parts are rated for 15 A average rectified current compared to the main part's 20 A rating. In applications where the circuit operates below 15 A, the substitutes function as direct equivalents. In applications requiring the full 20 A capacity, circuit thermal and electrical analysis is necessary to confirm substitute suitability.

Thermal Performance: The substitute parts support a maximum junction temperature of 175°C, compared to 150°C for the main part. This extended thermal rating provides additional operational margin in high-temperature environments.

Recovery Characteristics: The substitute parts feature fast recovery characteristics (≤500 ns) compared to the standard recovery (>500 ns) of the main part. Fast recovery reduces switching losses and reverse recovery current, providing improved performance in switching applications.

Frequently Asked Questions (FAQ)

Q: Can STTH1512G and STTH1512G-TR be used interchangeably with the 20ETS12STRR?

A: Both substitute parts are electrically and mechanically compatible with the 20ETS12STRR in applications where the circuit operates at or below 15 A. The identical D2PAK package permits direct board-level substitution. The primary difference is the reduced current rating (15 A vs. 20 A) and improved product status and regulatory compliance.

Q: What is the difference between STTH1512G and STTH1512G-TR?

A: Both parts are identical in electrical specifications and package type. The difference lies in packaging format: STTH1512G is supplied in Tube packaging, while STTH1512G-TR is supplied in Cut Tape (CT) and Digi-Reel® format. Selection depends on procurement and assembly requirements.

Q: Why is the forward voltage higher in the substitute parts?

A: The substitute parts exhibit a forward voltage of 2.1 V @ 15 A compared to 1.1 V @ 20 A for the main part. This difference reflects measurement at different current levels and the fast recovery technology employed in the substitutes. Forward voltage specifications are measured at the rated current of each device.

Q: Are the substitute parts suitable for high-temperature applications?

A: Yes. The substitute parts support a maximum junction temperature of 175°C, compared to 150°C for the main part. This extended rating provides additional thermal margin for high-temperature operating environments.

Q: What is the impact of the lower reverse leakage current in the substitute parts?

A: The substitute parts exhibit reverse leakage current of 15 µA @ 1200 V compared to 100 µA @ 1200 V for the main part. Lower reverse leakage reduces standby power dissipation and improves circuit efficiency, particularly in applications with extended idle periods.

Q: Can the substitute parts be used in circuits designed for 20 A operation?

A: The substitute parts are rated for 15 A average rectified current. Use in circuits requiring the full 20 A capacity requires circuit analysis to confirm that actual operating current remains within the 15 A rating. Thermal and electrical stress analysis is necessary to validate suitability.

Q: Are there any compliance advantages to using the substitute parts?

A: Yes. Both substitute parts are ROHS3 compliant, whereas the main part is RoHS non-compliant. For applications subject to RoHS directives or customer requirements, the substitute parts satisfy regulatory requirements. Both parts maintain REACH Unaffected status and identical ECCN and HTSUS classifications.

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