STTH2003CG Equivalent & Substitute Parts

Part Overview

The STTH2003CG is a general-purpose diode array manufactured by STMicroelectronics, configured as a 1 Pair Common Cathode with 300 V reverse voltage rating and 10 A average rectified current per diode. The device is housed in a TO-263-3 D2PAK surface mount package with 2 leads plus tab. This part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility within system designs.

Key Parameters

Parameter	Value	Unit
Diode Configuration	1 Pair Common Cathode	—
Voltage - DC Reverse (Vr) (Max)	300	V
Current - Average Rectified (Io) (per Diode)	10	A
Voltage - Forward (Vf) (Max) @ If	1.25 V @ 10 A	—
Reverse Recovery Time (trr)	35	ns
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	20	µA @ 300 V
Operating Temperature - Junction (Max)	175	°C
Package / Case	TO-263-3, D2PAK (2 Leads + Tab), TO-263AB	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the STTH2003CG is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Diode Configuration: 1 Pair Common Cathode
Voltage - DC Reverse (Vr) (Max): 300 V minimum
Current - Average Rectified (Io) (per Diode): 10 A minimum
Package / Case: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
Mounting Type: Surface Mount
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)

Substitution Categories:

Direct Parametric Equivalents maintain identical electrical specifications and package configuration. These parts are interchangeable without circuit modification.

Higher Current Rating Substitutes exceed the 10 A current specification while maintaining all other critical parameters. These parts provide enhanced current handling capability and are suitable for applications where the original 10 A rating is marginal.

Technology Variants employ different semiconductor technologies (Schottky, Super Barrier, HiPerFRED) while maintaining the core voltage and current specifications. These variants introduce different forward voltage and reverse recovery characteristics.

Lower Voltage Rating Substitutes do not qualify for direct substitution due to insufficient reverse voltage rating below 300 V.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io (per Diode) [A]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [µA]	Tj (Max) [°C]	Technology	Product Status	Package
STTH2003CG	STMicroelectronics	300	10	1.25 @ 10 A	35	20 @ 300 V	175	Standard	Obsolete	TO-263-3, D2PAK
VS-20CTH03S-M3	Vishay General Semiconductor - Diodes Division	300	10	1.25 @ 10 A	35	20 @ 300 V	175	Standard	Active	TO-263-3, D2PAK
LQA20B300C	Power Integrations	300	10	1.9 @ 10 A	12.6	25 @ 300 V	150	Standard	Active	TO-263-3, D2PAK
LQA12B300C	Power Integrations	300	6	1.9 @ 6 A	11.5	25 @ 300 V	150	Schottky	Active	TO-263-3, D2PAK
DPG30C300PC-TRL	IXYS	300	15	1.26 @ 15 A	35	1 @ 300 V	175	Standard	Active	TO-263-3, D2PAK
DPG60C300PC-TRL	IXYS	300	30	1.35 @ 30 A	35	1 @ 300 V	175	Standard	Active	TO-263-3, D2PAK
SBR40U300CTB-13	Diodes Incorporated	300	20	0.92 @ 20 A	50	100 @ 300 V	175	Super Barrier	Active	TO-263-3, D2PAK
SBR40U300CTB	Diodes Incorporated	300	20	0.92 @ 20 A	50	100 @ 300 V	175	Super Barrier	Active	TO-263-3, D2PAK
SDURB2030CT	SMC Diode Solutions	300	—	1.3 @ 10 A	45	30 @ 300 V	150	Standard	Active	TO-263-3, D2PAK
MURB1620CTT4G	onsemi	200	8	0.975 @ 8 A	35	5 @ 200 V	175	Standard	Active	TO-263-3, D2PAK

Engineering Selection Recommendations

Direct Parametric Equivalent (Recommended for Direct Replacement):

VS-20CTH03S-M3 (Vishay General Semiconductor - Diodes Division) is the direct parametric equivalent to STTH2003CG. This part maintains identical electrical specifications across all critical parameters: 300 V reverse voltage, 10 A average rectified current, 1.25 V forward voltage at 10 A, 35 ns reverse recovery time, and 20 µA reverse leakage current. The part is ROHS3 compliant, MSL 1 rated, and carries active product status. This substitution requires no circuit modification and provides pin-for-pin compatibility in the TO-263-3 D2PAK package.

Higher Current Capacity Substitutes (For Enhanced Performance):

DPG30C300PC-TRL (IXYS, 15 A rating) and DPG60C300PC-TRL (IXYS, 30 A rating) provide increased current handling while maintaining 300 V reverse voltage and identical package configuration. Both parts are ROHS3 compliant with active product status. These substitutes are suitable for applications where thermal margin or current headroom is required. The DPG30C300PC-TRL maintains 35 ns reverse recovery time matching the original specification.

SBR40U300CTB-13 and SBR40U300CTB (Diodes Incorporated, 20 A rating) employ Super Barrier technology, delivering lower forward voltage (0.92 V at 20 A) compared to the original 1.25 V specification. These parts are ROHS3 compliant with active product status and extended operating temperature range (-65°C to 175°C). The trade-off is increased reverse recovery time (50 ns versus 35 ns) and higher reverse leakage current (100 µA versus 20 µA).

Technology Variant Substitutes:

LQA20B300C (Power Integrations, 10 A rating) maintains the original 10 A current specification with identical 300 V reverse voltage and TO-263-3 D2PAK package. This part employs standard diode technology with significantly reduced reverse recovery time (12.6 ns versus 35 ns). Operating temperature maximum is 150°C versus 175°C for the original part. RoHS compliance is confirmed with MSL 2 rating (1 Year).

LQA12B300C (Power Integrations, 6 A rating) employs Schottky technology with 300 V reverse voltage rating. This part is not suitable for direct substitution due to reduced current rating (6 A versus 10 A) and higher forward voltage (1.9 V at 6 A versus 1.25 V at 10 A).

Not Recommended for Substitution:

MURB1620CTT4G (onsemi, 200 V rating) does not meet the minimum 300 V reverse voltage requirement and is unsuitable for direct substitution.

SDURB2030CT (SMC Diode Solutions) lacks specified average rectified current rating, preventing complete parametric verification.

Frequently Asked Questions (FAQ)

Q: Can VS-20CTH03S-M3 be used as a direct replacement for STTH2003CG?

A: Yes. VS-20CTH03S-M3 is a direct parametric equivalent with identical electrical specifications and package configuration. No circuit modification is required. Both parts maintain 300 V reverse voltage, 10 A average rectified current, 1.25 V forward voltage at 10 A, and 35 ns reverse recovery time. The substitute is ROHS3 compliant with active product status.

Q: What is the difference between the STTH2003CG and higher current-rated substitutes like DPG30C300PC-TRL?

A: DPG30C300PC-TRL is rated for 15 A average rectified current per diode compared to 10 A for STTH2003CG. Both maintain 300 V reverse voltage and identical package configuration. The higher current rating provides increased thermal margin and current headroom in applications where the original 10 A specification is marginal. Forward voltage characteristics remain comparable (1.26 V at 15 A versus 1.25 V at 10 A).

Q: Are there performance differences between standard and Super Barrier technology diodes in the 300 V, 20 A category?

A: Yes. SBR40U300CTB-13 employs Super Barrier technology, delivering lower forward voltage (0.92 V at 20 A) compared to standard technology equivalents. This reduces power dissipation in high-current applications. The trade-off is increased reverse recovery time (50 ns versus 35 ns for standard types) and higher reverse leakage current (100 µA versus 20 µA). Both technologies are ROHS3 compliant with active product status.

Q: Why is MURB1620CTT4G not suitable as a substitute?

A: MURB1620CTT4G is rated for 200 V maximum reverse voltage, which is below the 300 V requirement of STTH2003CG. This part does not meet the critical voltage specification and is unsuitable for direct substitution in circuits designed for 300 V operation.

Q: What packaging options are available for STTH2003CG substitutes?

A: All recommended substitutes are housed in the TO-263-3 D2PAK (2 Leads + Tab) surface mount package, maintaining mechanical and thermal compatibility with the original part. Packaging variants include Tape & Reel (TR), Cut Tape (CT) & Digi-Reel®, and Tube configurations, allowing selection based on procurement and assembly requirements.

Q: How do Schottky diodes like LQA12B300C compare to standard technology substitutes?

A: Schottky diodes exhibit significantly lower reverse recovery time (11.5 ns for LQA12B300C versus 35 ns for STTH2003CG) and higher forward voltage (1.9 V at 6 A versus 1.25 V at 10 A). LQA12B300C is rated for 6 A, making it unsuitable for direct substitution in 10 A applications. Schottky technology is beneficial in high-frequency switching applications where reverse recovery losses are critical.

Q: What is the significance of MSL (Moisture Sensitivity Level) ratings in component selection?

A: MSL 1 (Unlimited) indicates the component can be stored indefinitely without moisture absorption concerns, simplifying inventory management and assembly scheduling. MSL 2 (1 Year) requires controlled storage conditions and limits shelf life. STTH2003CG and most recommended substitutes carry MSL 1 rating, except LQA20B300C and LQA12B300C which are MSL 2 rated.

Q: Are all recommended substitutes ROHS3 compliant?

A: ROHS3 compliance is confirmed for STTH2003CG, VS-20CTH03S-M3, DPG30C300PC-TRL, DPG60C300PC-TRL, SBR40U300CTB-13, SBR40U300CTB, and MURB1620CTT4G. LQA20B300C and LQA12B300C carry standard RoHS compliance. SDURB2030CT is ROHS3 compliant but carries REACH Affected status, requiring verification for specific regulatory jurisdictions.

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