STTH1512D Equivalent & Substitute Parts

Part Overview

The STTH1512D is a general-purpose fast recovery rectifier diode manufactured by STMicroelectronics, rated for 1200 V DC reverse voltage and 15 A average rectified current in a TO-220AC through-hole package. This device is classified as obsolete, indicating it has reached end-of-life status and is no longer in active production. Locating 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)	15	A
Voltage - Forward (Vf) (Max) @ If	2.1 V @ 15 A	V
Reverse Recovery Time (trr)	105	ns
Current - Reverse Leakage @ Vr	15	µA @ 1200 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Mounting Type	Through Hole	—
Package / Case	TO-220-2	—
Supplier Device Package	TO-220AC	—
Operating Temperature - Junction (Max)	175	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the STTH1512D are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Mandatory Matching Criteria:

Voltage - DC Reverse (Vr) (Max): 1200 V
Mounting Type: Through Hole
Package / Case: TO-220-2
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)

Allowable Variation Criteria:

Current - Average Rectified (Io): Substitute parts may equal or exceed the 15 A rating
Voltage - Forward (Vf) (Max) @ If: Substitute parts may vary within acceptable forward voltage ranges for the respective current ratings
Reverse Recovery Time (trr): Substitute parts may be equal to or faster than 105 ns
Current - Reverse Leakage @ Vr: Substitute parts may vary based on manufacturer specifications
Operating Temperature - Junction: Substitute parts must support the application's thermal requirements

Substitute parts identified for the STTH1512D include devices from IXYS, onsemi, and Vishay General Semiconductor - Diodes Division, all meeting the core electrical and mechanical requirements while offering active product status or extended inventory availability.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [V]	trr [ns]	Ir @ Vr [µA]	Package	Product Status
STTH1512D	STMicroelectronics	1200	15	2.1 @ 15 A	105	15 @ 1200 V	TO-220AC	Obsolete
STTH1212D	STMicroelectronics	1200	12	2.2 @ 12 A	100	10 @ 1200 V	TO-220AC	Active
DSEI20-12A	IXYS	1200	17	2.15 @ 12 A	60	750 @ 1200 V	TO-220AC	Active
DSEP29-12A	IXYS	1200	30	2.75 @ 30 A	40	250 @ 1200 V	TO-220AC	Active
DSEP8-12A	IXYS	1200	10	2.94 @ 10 A	40	60 @ 1200 V	TO-220AC	Active
RHRP15120	onsemi	1200	15	3.2 @ 15 A	75	100 @ 1200 V	TO-220-2L	Last Time Buy
VS-8ETU12HN3	Vishay General Semiconductor - Diodes Division	1200	8	2.55 @ 8 A	144	55 @ 1200 V	TO-220AC	Active

Engineering Selection Recommendations

Direct Current Rating Match: The RHRP15120 from onsemi provides an exact current rating match of 15 A at 1200 V. However, this part is classified as Last Time Buy, indicating limited future availability. The RHRP15120 is ROHS3 compliant and suitable for applications requiring identical current specifications.

Higher Current Rating Substitutes: The DSEI20-12A (17 A) and DSEP29-12A (30 A) from IXYS exceed the original 15 A specification and are classified as active products with full production support. These devices are suitable for applications where higher current capacity provides design margin or future upgrade potential. Both are ROHS3 compliant.

Lower Current Rating Substitutes: The STTH1212D from STMicroelectronics (12 A) and DSEP8-12A from IXYS (10 A) provide reduced current ratings. These are applicable only in applications where the circuit design permits operation at lower current levels. Both are ROHS3 compliant and active products.

Automotive-Qualified Option: The VS-8ETU12HN3 from Vishay General Semiconductor - Diodes Division carries AEC-Q101 automotive qualification and is suitable for automotive applications requiring this certification. This device is active and ROHS3 compliant.

Compliance Considerations: All identified substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the regulatory posture of the original STTH1512D. All devices support the 175°C maximum junction temperature requirement or exceed it.

Frequently Asked Questions (FAQ)

Q: Can the STTH1212D (12 A) be used as a direct replacement for the STTH1512D (15 A)?

A: The STTH1212D is electrically compatible at 1200 V reverse voltage and uses the same TO-220AC package. However, it is rated for 12 A average rectified current versus the original 15 A. This substitute is applicable only if the circuit design operates at or below 12 A. The forward voltage characteristics are similar (2.2 V @ 12 A versus 2.1 V @ 15 A), and the reverse recovery time is faster (100 ns versus 105 ns).

Q: What is the advantage of using DSEI20-12A or DSEP29-12A over the original STTH1512D?

A: Both IXYS devices provide higher current ratings (17 A and 30 A respectively) while maintaining 1200 V reverse voltage and TO-220AC packaging. These parts are active products with ongoing production support, addressing the obsolescence of the STTH1512D. The DSEI20-12A offers a 17 A rating with faster recovery time (60 ns), and the DSEP29-12A provides 30 A capacity with the fastest recovery time (40 ns) among all substitutes.

Q: Is the RHRP15120 a suitable replacement for the STTH1512D?

A: The RHRP15120 matches the 15 A current rating and 1200 V reverse voltage specification. Both use TO-220-2 package variants (TO-220AC versus TO-220-2L). However, the RHRP15120 is classified as Last Time Buy, indicating limited future availability. The forward voltage is higher (3.2 V @ 15 A versus 2.1 V @ 15 A), which may affect circuit performance in applications sensitive to forward voltage drop.

Q: Can the VS-8ETU12HN3 be used in non-automotive applications?

A: Yes. The VS-8ETU12HN3 is an active product rated for 1200 V and 8 A in a TO-220AC package. While it carries AEC-Q101 automotive qualification, this certification does not restrict its use in non-automotive applications. The 8 A rating is lower than the original 15 A, so it is applicable only in circuits designed for this current level or lower.

Q: What are the package compatibility considerations?

A: All substitute parts use TO-220-2 package variants (TO-220AC or TO-220-2L). These are mechanically and thermally compatible with the original STTH1512D TO-220AC package. Pin configurations are identical, allowing direct board-level substitution without layout modifications. Thermal performance characteristics remain consistent across all identified substitutes.

Q: How do reverse recovery times compare across substitute options?

A: The original STTH1512D has a reverse recovery time of 105 ns. Substitute parts range from 40 ns (DSEP29-12A and DSEP8-12A) to 144 ns (VS-8ETU12HN3). Faster recovery times reduce switching losses and electromagnetic interference in high-frequency applications. Selection should be based on circuit operating frequency and thermal management requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All identified substitute parts are ROHS3 compliant and REACH unaffected, matching the regulatory compliance of the original STTH1512D. This ensures compatibility with procurement and environmental regulations applicable to the original design.

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