STTA212S Equivalent & Substitute Parts

Part Overview

The STTA212S is a general-purpose rectifier diode manufactured by STMicroelectronics, rated for 1200 V DC reverse voltage and 2 A average rectified current in a Surface Mount SMC (DO-214AB) package. This device is part of the TURBOSWITCH™ series and features fast recovery characteristics with a reverse recovery time of 115 ns.

The STTA212S 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)	2	A
Voltage - Forward (Vf) (Max) @ If	1.65	V @ 2 A
Reverse Recovery Time (trr)	115	ns
Current - Reverse Leakage @ Vr	20	µA @ 1200 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	-
Package / Case	DO-214AB, SMC	-
Mounting Type	Surface Mount	-
Operating Temperature - Junction (Max)	125	°C

Substitute Part Grouping Explanation

Substitute parts for the STTA212S are identified based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

Voltage - DC Reverse (Vr) (Max): 1200 V
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
Current - Average Rectified (Io): Equal to or greater than 2 A

Secondary Compatibility Factors:

Speed Classification: Fast Recovery or Standard Recovery
Reverse Recovery Time (trr): Dependent on application switching frequency requirements
Voltage - Forward (Vf) (Max): Affects power dissipation characteristics
Current - Reverse Leakage @ Vr: Influences standby power consumption
Operating Temperature - Junction: Determines thermal operating range
Product Status and Compliance: RoHS and REACH certifications

Substitute parts meeting the primary criteria are considered functionally compatible for the same circuit application, provided secondary factors align with design specifications.

Parameter Comparison

Parameter	STTA212S	STTH212S	S3N
Manufacturer	STMicroelectronics	STMicroelectronics	onsemi
Voltage - DC Reverse (Vr) (Max)	1200 V	1200 V	1200 V
Current - Average Rectified (Io)	2 A	2 A	3 A
Voltage - Forward (Vf) (Max) @ If	1.65 V @ 2 A	1.75 V @ 2 A	1.2 V @ 3 A
Reverse Recovery Time (trr)	115 ns	75 ns	2.5 µs
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	20 µA @ 1200 V	10 µA @ 1200 V	5 µA @ 1200 V
Package / Case	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction (Max)	125°C	175°C	150°C
Product Status	Obsolete	Active	Not For New Designs
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

STTH212S (STMicroelectronics)

The STTH212S is the primary substitute for the STTA212S. Both devices are manufactured by STMicroelectronics and share identical voltage and current ratings (1200 V, 2 A). The STTH212S is classified as Active, ensuring continued availability and supply chain support. The device exhibits improved performance characteristics: faster reverse recovery time (75 ns versus 115 ns), lower reverse leakage current (10 µA versus 20 µA), and higher maximum junction temperature (175°C versus 125°C). The STTH212S is ROHS3 compliant, addressing regulatory requirements that the obsolete STTA212S does not meet. Forward voltage is marginally higher (1.75 V versus 1.65 V), resulting in negligible additional power dissipation in most applications. The STTH212S is available in Cut Tape and Digi-Reel® packaging formats.

S3N (onsemi)

The S3N is a secondary substitute option from onsemi, rated for 1200 V and 3 A average rectified current. The higher current rating (3 A versus 2 A) provides design margin for applications with current headroom. The S3N exhibits superior reverse leakage characteristics (5 µA versus 20 µA) and lower forward voltage (1.2 V @ 3 A). However, the S3N employs standard recovery technology with a reverse recovery time of 2.5 µs, significantly longer than the STTA212S (115 ns). This characteristic makes the S3N unsuitable for high-frequency switching applications where fast recovery is required. The S3N is classified as Not For New Designs, limiting its suitability for new product development. The device is ROHS3 compliant and available in Tape & Reel packaging.

Frequently Asked Questions (FAQ)

Q: Can the STTH212S directly replace the STTA212S without circuit modifications?

A: Yes. The STTH212S is a direct substitute for the STTA212S. Both devices share identical voltage ratings (1200 V), current ratings (2 A), package type (DO-214AB, SMC), and mounting configuration (Surface Mount). The STTH212S exhibits improved electrical characteristics and is actively manufactured, making it the recommended replacement.

Q: What is the primary difference between the STTA212S and STTH212S?

A: The primary differences are product status and performance characteristics. The STTA212S is obsolete, while the STTH212S is active. The STTH212S features faster reverse recovery time (75 ns versus 115 ns), lower reverse leakage current (10 µA versus 20 µA), higher maximum junction temperature (175°C versus 125°C), and ROHS3 compliance. Forward voltage is marginally higher (1.75 V versus 1.65 V).

Q: Is the S3N suitable as a substitute for the STTA212S?

A: The S3N is functionally compatible from a voltage and package perspective but exhibits significant differences in recovery speed. The S3N uses standard recovery technology (2.5 µs trr) compared to the STTA212S fast recovery (115 ns trr). The S3N is appropriate only for low-frequency or DC rectification applications. For switching applications requiring fast recovery characteristics, the STTH212S is the appropriate choice. Additionally, the S3N is classified as Not For New Designs.

Q: What are the packaging differences between substitute parts?

A: The STTA212S and STTH212S are both available in Surface Mount SMC (DO-214AB) packages. The STTA212S is supplied in Tape & Reel (TR) format, while the STTH212S is available in Cut Tape (CT) and Digi-Reel® formats. The S3N is supplied in Tape & Reel (TR) format. All three devices use identical package geometry, ensuring mechanical compatibility on printed circuit boards.

Q: How do the thermal characteristics compare between substitute parts?

A: The STTH212S supports a maximum junction temperature of 175°C, compared to 125°C for the STTA212S and 150°C for the S3N. The higher thermal rating of the STTH212S provides improved performance margin in high-temperature operating environments. The S3N operating temperature range is specified as −55°C to 150°C.

Q: Are there compliance differences between the STTA212S and its substitutes?

A: Yes. The STTA212S is RoHS non-compliant, while both the STTH212S and S3N are ROHS3 compliant. All three devices are REACH unaffected and classified under ECCN EAR99. For applications requiring RoHS compliance, the STTH212S or S3N must be selected.

Q: Which substitute is recommended for new product designs?

A: The STTH212S is the recommended substitute for new product designs. It is actively manufactured, ROHS3 compliant, and offers superior electrical characteristics compared to the obsolete STTA212S. The S3N is classified as Not For New Designs and should not be selected for new development.

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