STPS8L30B Equivalent & Substitute Parts

Part Overview

The STPS8L30B is a Schottky rectifier diode manufactured by STMicroelectronics, rated for 30 V DC reverse voltage and 8 A average rectified current in a Surface Mount DPAK package. This component is classified as Obsolete, necessitating identification of equivalent substitute parts for ongoing design requirements and procurement needs. Substitute parts must maintain functional compatibility within the specified electrical and mechanical parameters while offering active product status and continued availability.

Substiute Parts

STPS8L30B

STMicroelectronicsIn Stock: 12286STPS8L30B Datasheet

Current PartRFQ

MBRD835LT4G

onsemiIn Stock: 51490MBRD835LT4G Datasheet

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RB078BM30STL

Rohm SemiconductorIn Stock: 894RB078BM30STL Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the STPS8L30B is determined by the following critical parameters:

Primary Compatibility Criteria:

• Technology: Schottky diode
• Mounting Type: Surface Mount
• Package / Case: TO-252-3, DPAK (2 Leads + Tab), SC-63
• Voltage - DC Reverse (Vr) (Max): Equal to or greater than 30 V
• Current - Average Rectified (Io): Equal to or greater than 8 A
• Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

Substitute Parts Identified:

Group 1: Full Parameter Match (Recommended)

• MBRD835LT4G (onsemi): Meets all primary criteria with 35 V reverse voltage rating and 8 A current rating. Active product status. Identical package and thermal characteristics.

Group 2: Partial Parameter Match (Current Derating)

• RB078BM30STL (Rohm Semiconductor): Matches voltage and package specifications but rated for 5 A average rectified current, representing a 37.5% current derating relative to the STPS8L30B. Active product status. Suitable only for applications requiring ≤ 5 A operation.

Parameter Comparison

Engineering Selection Recommendations

MBRD835LT4G (onsemi) - Primary Substitute

The MBRD835LT4G is the recommended substitute for the obsolete STPS8L30B. This part maintains full electrical compatibility with identical 8 A current rating and exceeds the reverse voltage specification at 35 V. The MBRD835LT4G carries Active product status, ensuring long-term availability and supply chain continuity. Both components are ROHS3 Compliant with MSL 1 (Unlimited) ratings, confirming equivalent environmental and handling requirements. The forward voltage differential of 20 mV at 8 A is within acceptable engineering tolerance for most rectifier applications. Identical DPAK packaging and thermal characteristics enable direct board-level substitution without layout modifications.

RB078BM30STL (Rohm Semiconductor) - Secondary Substitute

The RB078BM30STL is suitable as a substitute only for applications where the average rectified current requirement does not exceed 5 A. This part matches the 30 V reverse voltage specification and maintains identical package geometry and thermal ratings. The RB078BM30STL carries Active product status and equivalent compliance certifications. The elevated forward voltage of 720 mV at 5 A represents a significant increase relative to the STPS8L30B and must be evaluated for thermal and efficiency impact in the target application. This substitute is not appropriate for designs requiring the full 8 A current capacity of the original component.

Frequently Asked Questions (FAQ)

Q: Can the MBRD835LT4G directly replace the STPS8L30B without circuit modifications?

A: Yes. The MBRD835LT4G maintains identical current rating (8 A), equivalent reverse voltage specification (35 V exceeds 30 V requirement), and identical DPAK package geometry. No circuit modifications are required for direct substitution.

Q: What is the significance of the 35 V rating on the MBRD835LT4G versus the 30 V rating on the STPS8L30B?

A: The higher reverse voltage rating on the MBRD835LT4G provides additional design margin and does not create compatibility issues. The part operates safely in circuits designed for 30 V maximum reverse voltage.

Q: Why is the RB078BM30STL listed as a secondary substitute if it has the same voltage rating?

A: The RB078BM30STL is rated for 5 A average rectified current, compared to 8 A for the STPS8L30B. This represents a 37.5% current derating and restricts its use to applications requiring ≤ 5 A operation. The elevated forward voltage (720 mV @ 5 A) also increases power dissipation relative to the primary substitute.

Q: Are there thermal or operating temperature differences between these parts?

A: All three parts share identical maximum junction operating temperature of 150°C. Thermal performance differences are determined by forward voltage characteristics and package thermal resistance, which are identical across the DPAK package variants.

Q: What compliance certifications apply to the substitute parts?

A: Both MBRD835LT4G and RB078BM30STL are ROHS3 Compliant with MSL 1 (Unlimited) ratings, matching the compliance profile of the STPS8L30B. Both are REACH Unaffected and classified as EAR99 for export control purposes.

Q: Can the STPS8L30B be used interchangeably with either substitute in existing inventory?

A: The STPS8L30B is classified as Obsolete and should not be specified for new designs. Existing inventory of the STPS8L30B may be used in current production until depletion, but the MBRD835LT4G is the recommended substitute for ongoing procurement and new design implementations.

Q: What is the impact of the forward voltage difference between STPS8L30B (490 mV) and MBRD835LT4G (510 mV)?

A: The 20 mV difference at 8 A represents a 4% increase in forward voltage drop. This results in proportionally increased power dissipation and thermal generation. For most rectifier applications, this differential is within acceptable engineering tolerance and does not require circuit redesign.

Q: Are the packaging and lead configurations identical across all three parts?

A: Yes. All three parts use the TO-252-3, DPAK (2 Leads + Tab), SC-63 package with identical pin configuration and board footprint. Direct PCB substitution is possible without layout modifications.