STTH1202DI Equivalent & Substitute Parts

Part Overview

The STTH1202DI is a general-purpose fast recovery rectifier diode manufactured by STMicroelectronics, rated for 200 V DC reverse voltage and 12 A average rectified current in a TO-220AC insulated through-hole package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The STTH1202DI operates with a maximum forward voltage of 1.1 V at 12 A and features a reverse recovery time of 35 ns, suitable for fast recovery applications. The device is RoHS3 compliant and REACH unaffected, with unlimited moisture sensitivity rating (MSL 1).

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	200	V
Current - Average Rectified (Io)	12	A
Voltage - Forward (Vf) (Max) @ If	1.1 @ 12 A	V
Reverse Recovery Time (trr)	35	ns
Current - Reverse Leakage @ Vr	10	µA @ 200 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Mounting Type	Through Hole	—
Package / Case	TO-220-2 Insulated (TO-220AC)	—
Operating Temperature - Junction (Max)	175	°C
RoHS Status	ROHS3 Compliant	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the STTH1202DI is determined by the following critical parameters:

Voltage Rating: All substitute parts must maintain a minimum DC reverse voltage rating of 200 V to ensure equivalent reverse bias protection.

Current Rating: The STTH1202DI is rated for 12 A average rectified current. Substitute parts may have equal or higher current ratings (8 A, 10 A, 15 A, or 20 A) without functional degradation in applications requiring 12 A or less.

Speed Classification: All substitute parts must be classified as fast recovery diodes with reverse recovery time ≤ 500 ns and forward current > 200 mA to maintain switching performance characteristics.

Mounting and Package: All substitute parts use through-hole mounting in TO-220-2 or TO-220AC packages, ensuring mechanical and thermal compatibility with the original design.

Compliance: All substitute parts are RoHS3 compliant and REACH unaffected, matching the environmental and regulatory status of the original component.

Substitute parts are grouped by current rating capability: 8 A (MUR820-BP, MUR820G, BYW29-200G, BYW80-200G), 10 A (DPG10I200PA), 15 A (DPG15I200PA, MUR1520G), and 20 A (MUR2020RG).

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [V]	trr [ns]	Ir @ Vr [µA]	Package	Tj (Max) [°C]	Status
STTH1202DI	STMicroelectronics	200	12	1.1 @ 12 A	35	10 @ 200 V	TO-220AC	175	Obsolete
MUR820-BP	Micro Commercial Co	200	8	0.975 @ 8 A	35	5 @ 200 V	TO-220AC	150	Active
MUR820G	onsemi	200	8	0.975 @ 8 A	35	5 @ 200 V	TO-220-2	175	Active
BYW29-200G	onsemi	200	8	1.3 @ 20 A	35	5 @ 200 V	TO-220-2	175	Active
BYW80-200G	onsemi	200	8	1.25 @ 22 A	35	10 @ 200 V	TO-220-2	175	Active
DPG10I200PA	IXYS	200	10	1.27 @ 10 A	35	1 @ 200 V	TO-220AC	175	Active
DPG15I200PA	IXYS	200	15	1.26 @ 15 A	35	1 @ 200 V	TO-220AC	175	Active
MUR1520G	onsemi	200	15	1.05 @ 15 A	35	10 @ 200 V	TO-220-2	175	Active
MUR2020RG	onsemi	200	20	1.1 @ 20 A	95	50 @ 200 V	TO-220-2	175	Active

Engineering Selection Recommendations

For Direct Current Rating Match (12 A):

No single substitute part is rated exactly at 12 A. Selection must be based on application requirements and thermal design considerations.

For Closest Performance Match:

DPG15I200PA and MUR1520G both provide 15 A current ratings with 200 V reverse voltage and 35 ns reverse recovery time. Both are active products with full RoHS3 compliance. DPG15I200PA offers lower reverse leakage current (1 µA vs. 10 µA) and maintains the TO-220AC package format. MUR1520G provides lower forward voltage (1.05 V @ 15 A) and extended temperature range (-65°C to 175°C).

For Conservative Thermal Design:

MUR2020RG provides 20 A capability with 200 V rating and 1.1 V forward voltage at 20 A, matching the original forward voltage specification. This part accepts higher reverse recovery time (95 ns vs. 35 ns) and higher reverse leakage (50 µA vs. 10 µA), requiring verification against application switching frequency and thermal constraints.

For Lower Current Applications (≤ 8 A):

MUR820G and BYW80-200G both provide 8 A ratings with 200 V reverse voltage, 35 ns recovery time, and active product status. MUR820G maintains full temperature range (-65°C to 175°C) and lower forward voltage (0.975 V @ 8 A). Both are RoHS3 compliant.

Compliance Verification:

All recommended substitute parts are RoHS3 compliant and REACH unaffected, matching the regulatory status of the obsolete STTH1202DI. All parts are classified as fast recovery diodes meeting the ≤ 500 ns speed requirement.

Frequently Asked Questions (FAQ)

Q: Can I use an 8 A rated diode in place of the 12 A STTH1202DI?

A: An 8 A rated diode (MUR820G, BYW80-200G, BYW29-200G, or MUR820-BP) is suitable only if the application circuit operates at or below 8 A average rectified current. The 12 A rating of the original part indicates the design margin for that application. Verify actual circuit current requirements before substitution.

Q: What is the difference between TO-220-2 and TO-220AC packages?

A: Both are through-hole TO-220 packages with two leads. TO-220AC denotes an insulated version with isolation between the mounting tab and the semiconductor die. TO-220-2 is the standard designation. Mechanical compatibility is maintained across both variants for PCB mounting and heatsinking.

Q: Why does MUR2020RG have a longer reverse recovery time (95 ns vs. 35 ns)?

A: MUR2020RG is optimized for higher current handling (20 A) at the expense of switching speed. The 95 ns recovery time remains within the fast recovery classification (≤ 500 ns) but may impact efficiency in high-frequency switching applications. Verify switching frequency compatibility before selection.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are RoHS3 compliant and REACH unaffected, matching the environmental compliance status of the STTH1202DI.

Q: Which substitute provides the lowest forward voltage drop?

A: MUR820-BP and MUR820G both provide 0.975 V forward voltage at 8 A, the lowest among listed substitutes. MUR1520G provides 1.05 V at 15 A. Forward voltage selection impacts thermal dissipation and efficiency in rectifier circuits.

Q: Can I use DPG10I200PA as a direct replacement?

A: DPG10I200PA provides 10 A current rating, which is below the original 12 A specification. It is suitable for applications requiring 10 A or less. It maintains 200 V reverse voltage, 35 ns recovery time, TO-220AC package format, and 175°C maximum junction temperature, providing close electrical compatibility within its current rating.

Q: What is the temperature range difference between substitutes?

A: The STTH1202DI operates to 175°C maximum junction temperature. MUR820-BP is limited to 150°C maximum. All other substitutes support the full 175°C rating. Some onsemi parts (MUR820G, BYW29-200G, BYW80-200G, MUR1520G, MUR2020RG) extend the minimum operating temperature to -65°C, compared to -55°C for IXYS parts and -55°C for MUR820-BP.

Q: Is reverse leakage current a critical selection parameter?

A: Reverse leakage current affects standby power dissipation and DC bias stability. The STTH1202DI specifies 10 µA @ 200 V. DPG10I200PA and DPG15I200PA provide significantly lower leakage (1 µA), reducing standby losses. MUR2020RG specifies 50 µA, increasing standby dissipation. Selection depends on application duty cycle and thermal budget.

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