STTH112 Equivalent & Substitute Parts

Part Overview

The STTH112 is a general-purpose rectifier diode manufactured by STMicroelectronics, rated for 1200 V DC reverse voltage and 1 A average rectified current in a DO-41 through-hole axial package. This device features fast recovery characteristics with a reverse recovery time of 75 nanoseconds, making it suitable for standard rectification applications requiring moderate switching speeds.

The STTH112 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this component.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	1200	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.9 V @ 1 A	V
Reverse Recovery Time (trr)	75	ns
Current - Reverse Leakage @ Vr	5	µA @ 1200 V
Mounting Type	Through Hole
Package / Case	DO-204AL, DO-41, Axial
Operating Temperature - Junction (Max)	175	°C
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the STTH112 are selected based on the following critical electrical and mechanical parameters:

Primary Matching Criteria:

Voltage - DC Reverse (Vr) rating of 1200 V or higher
Current - Average Rectified (Io) rating of 1 A or higher
Through-hole axial mounting configuration (DO-41 or DO-204AL package)
RoHS3 compliance and REACH unaffected status

Secondary Compatibility Factors:

Forward voltage (Vf) characteristics within acceptable operating ranges
Reverse recovery time (trr) and speed classification
Reverse leakage current specifications
Operating temperature range compatibility

The substitute parts identified are all manufactured by Vishay General Semiconductor - Diodes Division and belong to the SUPERECTIFIER® series. These devices maintain electrical compatibility with the STTH112 while offering active product status and improved availability.

Parameter Comparison

Parameter	STTH112 (Main)	GI1-1200GP-E3/54	GP10N-E3/54	GP10Q-E3/73	GP10T-E3/54	GP10T-E3/73
Manufacturer	STMicroelectronics	Vishay General Semiconductor	Vishay General Semiconductor	Vishay General Semiconductor	Vishay General Semiconductor	Vishay General Semiconductor
Product Status	Obsolete	Active	Active	Active	Active	Active
Voltage - DC Reverse (Vr) (Max)	1200 V	1200 V	1100 V	1200 V	1300 V	1300 V
Current - Average Rectified (Io)	1 A	1 A	1 A	1 A	1 A	1 A
Voltage - Forward (Vf) (Max) @ If	1.9 V @ 1 A	1.1 V @ 1 A	1.2 V @ 1 A	1.2 V @ 1 A	1.3 V @ 1 A	1.3 V @ 1 A
Reverse Recovery Time (trr)	75 ns	1.5 µs	3 µs	3 µs	3 µs	3 µs
Speed Classification	Fast Recovery ≤ 500ns, > 200mA	Standard Recovery >500ns, > 200mA	Standard Recovery >500ns, > 200mA	Standard Recovery >500ns, > 200mA	Standard Recovery >500ns, > 200mA	Standard Recovery >500ns, > 200mA
Current - Reverse Leakage @ Vr	5 µA @ 1200 V	10 µA @ 1200 V	5 µA @ 1100 V	5 µA @ 1200 V	5 µA @ 1300 V	5 µA @ 1300 V
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AL, DO-41, Axial	DO-204AC, DO-15, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial
Operating Temperature - Junction	175°C (Max)	-65°C ~ 175°C	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement):

GP10Q-E3/73 and GP10T-E3/73 are the preferred substitutes for the STTH112. Both devices maintain the 1200 V DC reverse voltage rating, 1 A average rectified current, and DO-204AL (DO-41) axial package configuration. These parts are classified as active products with full RoHS3 compliance and REACH unaffected status, ensuring long-term supply chain availability and regulatory compliance.

Secondary Substitutes (Voltage-Rated Alternatives):

GP10T-E3/54 provides a higher voltage rating of 1300 V, offering additional design margin for applications with voltage transient considerations. This device maintains the same current rating, package type, and compliance certifications.

GI1-1200GP-E3/54 matches the 1200 V voltage specification but uses a DO-204AC (DO-15) package variant. This substitute is suitable only for applications where the DO-15 axial package footprint is acceptable. The forward voltage characteristic (1.1 V @ 1 A) is lower than the STTH112, indicating improved efficiency in rectification circuits.

Voltage-Derating Substitute:

GP10N-E3/54 operates at 1100 V maximum reverse voltage, representing a 100 V reduction from the STTH112 specification. This device is suitable only for applications where the lower voltage rating does not compromise circuit performance or safety margins.

Compliance and Availability:

All substitute parts maintain ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements. All identified substitutes are active products with documented inventory availability, ensuring reliable procurement for production and replacement applications.

Frequently Asked Questions (FAQ)

Q: Can GP10N-E3/54 be used as a direct replacement for STTH112?

A: GP10N-E3/54 is electrically compatible with the STTH112 for current and mounting requirements but operates at a reduced maximum reverse voltage of 1100 V compared to the STTH112's 1200 V rating. This substitute is suitable only for applications where the lower voltage specification does not create circuit reliability or safety concerns. Verify that the application's maximum reverse voltage stress does not exceed 1100 V before selecting this part.

Q: What is the primary difference between GP10Q-E3/73 and GP10T-E3/73?

A: Both GP10Q-E3/73 and GP10T-E3/73 share identical electrical specifications: 1200 V reverse voltage, 1 A average rectified current, and DO-204AL (DO-41) package configuration. The primary difference is packaging format: GP10Q-E3/73 is supplied in standard packaging, while GP10T-E3/73 is supplied in cut tape format. Selection between these variants depends on procurement and assembly process requirements.

Q: Why does GI1-1200GP-E3/54 use a different package designation (DO-204AC/DO-15) compared to other substitutes?

A: GI1-1200GP-E3/54 uses the DO-204AC (DO-15) package, which is a different axial diode package variant from the DO-204AL (DO-41) used by the STTH112 and most other substitutes. While both are through-hole axial packages, they have different physical dimensions and lead spacing. This substitute is compatible only with circuit board layouts designed for DO-15 package dimensions.

Q: How does the reverse recovery time difference affect circuit performance?

A: The STTH112 features a fast recovery time of 75 nanoseconds, while all Vishay substitute parts operate with standard recovery times of 1.5 to 3 microseconds. In high-frequency switching applications, the longer recovery time of substitute parts may increase switching losses and heat generation. For applications operating at frequencies below 100 kHz, this difference is typically negligible. For higher-frequency applications, circuit performance and thermal characteristics should be evaluated.

Q: Are all substitute parts suitable for the same operating temperature range as the STTH112?

A: The STTH112 specifies a maximum junction temperature of 175°C. Substitute parts GP10Q-E3/73, GP10T-E3/54, and GP10T-E3/73 specify a maximum junction temperature of 150°C, representing a 25°C reduction. GI1-1200GP-E3/54 and GP10N-E3/54 specify operating ranges of -65°C to 175°C and -65°C to 150°C respectively. For applications operating near the upper temperature limit, verify that the substitute part's thermal rating is adequate for the intended application.

Q: What is the significance of the forward voltage differences between the STTH112 and substitute parts?

A: The STTH112 specifies a maximum forward voltage of 1.9 V @ 1 A, while substitute parts range from 1.1 V to 1.3 V @ 1 A. Lower forward voltage indicates reduced power dissipation during conduction. For rectification circuits, the lower forward voltage of substitute parts results in improved efficiency and reduced heat generation. This difference becomes significant in high-current or continuous-duty applications where thermal management is critical.

Q: Can substitute parts with higher voltage ratings (1300 V) be used in place of the STTH112 (1200 V)?

A: Yes. GP10T-E3/54 and GP10T-E3/73, both rated for 1300 V maximum reverse voltage, are fully compatible with the STTH112 specification. The higher voltage rating provides additional design margin and protection against voltage transients without compromising circuit functionality. These parts are direct electrical substitutes with identical current ratings and package configurations.

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