STTH30R03CG Equivalent & Substitute Parts

Part Overview

The STTH30R03CG is a diode array rectifier manufactured by STMicroelectronics, configured as a 1 Pair Common Cathode design rated for 300 V DC reverse voltage and 15 A average rectified current per diode. The component is housed in a TO-263-3 D2PAK surface mount package with 2 leads plus tab configuration. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating the same physical package footprint.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	300	V
Current - Average Rectified (Io) (per Diode)	15	A
Voltage - Forward (Vf) (Max) @ If	1.9 V @ 15 A	V
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
Diode Configuration	1 Pair Common Cathode	—
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 eligibility for the STTH30R03CG is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 300 V
Diode Configuration: Must be 1 Pair Common Cathode
Package / Case: Must be TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
Mounting Type: Must be Surface Mount
Current - Average Rectified (Io) (per Diode): Must equal or exceed 15 A

Performance Alignment Criteria:

Reverse Recovery Time (trr): Must support Fast Recovery classification (≤ 500ns, > 200mA)
Operating Temperature - Junction: Must support minimum 175°C operation
RoHS Status: Must maintain ROHS3 Compliance

Substitute parts are grouped into two categories based on current rating alignment:

Category A - Direct Current Rating Match (15 A): Parts with 15 A average rectified current per diode provide direct electrical equivalence with minimal circuit redesign.

Category B - Higher Current Rating (20 A and above): Parts with current ratings exceeding 15 A provide enhanced current handling capability and are electrically compatible for applications requiring the STTH30R03CG specification.

Category C - Lower Current Rating (6 A to 10 A): Parts with current ratings below 15 A do not meet the mandatory current requirement and are not suitable substitutes for the STTH30R03CG.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io per Diode [A]	Vf (Max) @ If [V]	trr [ns]	Tj (Max) [°C]	Technology	Product Status	Package
STTH30R03CG	STMicroelectronics	300	15	1.9 @ 15 A	35	175	Standard	Obsolete	TO-263-3, D2PAK
DPG30C300PC-TRL	IXYS	300	15	1.26 @ 15 A	35	175	Standard	Active	TO-263-3, D2PAK
SDURB3030CT	SMC Diode Solutions	300	15	1.25 @ 15 A	45	150	Standard	Active	TO-263-3, D2PAK
SBR40U300CTB-13	Diodes Incorporated	300	20	0.92 @ 20 A	50	175	Super Barrier	Active	TO-263-3, D2PAK
SBR40U300CTB	Diodes Incorporated	300	20	0.92 @ 20 A	50	175	Super Barrier	Active	TO-263-3, D2PAK
LQA20B300C	Power Integrations	300	10	1.9 @ 10 A	12.6	150	Standard	Active	TO-263-3, D2PAK
LQA12B300C	Power Integrations	300	6	1.9 @ 6 A	11.5	150	Schottky	Active	TO-263-3, D2PAK

Engineering Selection Recommendations

Recommended Substitutes (Direct Equivalence):

DPG30C300PC-TRL (IXYS) is the primary recommended substitute. This part maintains identical voltage (300 V), current (15 A), and temperature (175°C) specifications as the STTH30R03CG. The DPG30C300PC-TRL is Active status, ROHS3 Compliant, and features improved forward voltage characteristics (1.26 V vs. 1.9 V @ 15 A), resulting in lower power dissipation. Reverse recovery time matches at 35 ns. This part is available in Tape & Reel packaging.

SDURB3030CT (SMC Diode Solutions) provides direct current and voltage equivalence (300 V, 15 A) with Active product status and ROHS3 Compliance. Forward voltage is 1.25 V @ 15 A, offering improved efficiency. Operating temperature maximum is 150°C, which is 25°C lower than the original specification. Reverse recovery time is 45 ns. This part is suitable for applications where the reduced junction temperature rating is acceptable.

Alternative Substitutes (Higher Current Capability):

SBR40U300CTB-13 and SBR40U300CTB (Diodes Incorporated) both provide 20 A current rating with 300 V voltage specification, exceeding the STTH30R03CG requirement. These parts feature Super Barrier technology with significantly lower forward voltage (0.92 V @ 20 A), reducing thermal load. Operating temperature range extends to 175°C. Both parts are Active status and ROHS3 Compliant. The -13 suffix indicates Tape & Reel packaging; the non-suffixed version is supplied in Tube. These parts are suitable for designs requiring enhanced current margin or reduced power dissipation.

Not Recommended (Insufficient Current Rating):

LQA20B300C (Power Integrations) and LQA12B300C (Power Integrations) do not meet the mandatory 15 A current requirement, with ratings of 10 A and 6 A respectively. These parts are not suitable substitutes for the STTH30R03CG.

Frequently Asked Questions (FAQ)

Q: Can the STTH30R03CG be replaced with a lower current-rated part such as LQA20B300C (10 A)?

A: No. The STTH30R03CG is rated for 15 A average rectified current per diode. Substituting with a 10 A part violates the mandatory current compatibility criterion and creates risk of component thermal stress and circuit failure.

Q: What is the primary advantage of DPG30C300PC-TRL over the original STTH30R03CG?

A: The DPG30C300PC-TRL maintains identical electrical specifications (300 V, 15 A, 175°C) while offering reduced forward voltage (1.26 V vs. 1.9 V @ 15 A). This results in lower power dissipation and improved thermal efficiency. The part is Active status, ensuring long-term availability.

Q: Are SBR40U300CTB and SBR40U300CTB-13 interchangeable?

A: Both parts are electrically and mechanically identical. The difference is packaging format: SBR40U300CTB-13 is supplied in Tape & Reel (TR), while SBR40U300CTB is supplied in Tube. Selection depends on assembly process requirements and procurement volume.

Q: Can the STTH30R03CG be replaced with SBR40U300CTB-13 (20 A rating)?

A: Yes. The SBR40U300CTB-13 meets all mandatory compatibility criteria: 300 V voltage rating, 1 Pair Common Cathode configuration, TO-263-3 D2PAK package, and Surface Mount mounting. The 20 A current rating exceeds the 15 A requirement, providing additional current margin. Forward voltage is lower (0.92 V vs. 1.9 V), reducing power dissipation. This substitution is electrically valid.

Q: What is the impact of SDURB3030CT's 150°C maximum junction temperature compared to the STTH30R03CG's 175°C?

A: The SDURB3030CT has a 25°C lower maximum junction temperature rating. This part is suitable for applications where the circuit design maintains junction temperatures below 150°C. For designs requiring operation near 175°C, the DPG30C300PC-TRL or SBR40U300CTB-13 are preferred.

Q: Are all substitute parts ROHS3 Compliant?

A: All recommended substitutes (DPG30C300PC-TRL, SDURB3030CT, SBR40U300CTB-13, SBR40U300CTB) are ROHS3 Compliant. The lower-rated parts (LQA20B300C, LQA12B300C) are RoHS Compliant but not ROHS3 Compliant. Compliance status should be verified against specific design requirements.

Q: What is the significance of the TO-263-3 D2PAK package specification?

A: The TO-263-3 D2PAK package is a surface mount configuration with 2 leads plus a thermal tab. All substitute parts must use this identical package to ensure PCB footprint compatibility, thermal management characteristics, and assembly process alignment. Package compatibility is a mandatory substitution criterion.

Q: Does reverse recovery time affect substitution suitability?

A: Reverse recovery time (trr) is a performance parameter that affects switching characteristics and EMI behavior. The STTH30R03CG specifies 35 ns. Substitute parts with equal or slightly higher trr values (DPG30C300PC-TRL at 35 ns, SDURB3030CT at 45 ns, SBR40U300CTB-13 at 50 ns) are compatible. Significantly lower trr values indicate different diode technology but do not preclude substitution if other electrical parameters align.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message