SS8550-D-BP Equivalent & Substitute Parts

Part Overview

The SS8550-D-BP is a PNP bipolar junction transistor manufactured by Micro Commercial Co, rated for 25V collector-emitter breakdown voltage and 1.5A maximum collector current. This device is designed for general-purpose switching and amplification applications in through-hole TO-92 packaging.

The SS8550-D-BP carries an Obsolete product status. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for systems utilizing this component.

Substiute Parts

SS8550-D-BP

Micro Commercial CoIn Stock: 740SS8550-D-BP Datasheet

Current PartRFQ

SS8550DBU

onsemiIn Stock: 80199SS8550DBU Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SS8550-D-BP is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Matching Parameters:

• Transistor polarity: PNP
• Maximum collector current: 1.5A
• Maximum collector-emitter breakdown voltage: 25V
• Maximum power dissipation: 1W
• Mounting configuration: Through Hole
• Package type: TO-92-3 (TO-226AA)
• DC current gain minimum: 160 @ 100mA, 1V

Allowable Variations:

• Transition frequency may equal or exceed the original specification (190MHz minimum)
• Vce saturation may be equal to or lower than the original specification (800mV maximum)
• Operating temperature range may equal or exceed the original specification
• Product status may transition from Obsolete to Active
• RoHS and compliance certifications may be updated to current standards

The SS8550DBU manufactured by onsemi meets all critical matching parameters and allowable variation criteria, establishing it as a direct electrical and mechanical equivalent.

Parameter Comparison

Engineering Selection Recommendations

The SS8550DBU from onsemi is a direct substitute for the SS8550-D-BP based on the following engineering criteria:

Electrical Equivalence: All critical electrical parameters match or exceed the original specification. The SS8550DBU maintains identical maximum ratings for collector current (1.5A), collector-emitter breakdown voltage (25V), power dissipation (1W), and DC current gain (160 minimum). The transition frequency of 200MHz exceeds the original 190MHz specification, and the Vce saturation of 500mV is superior to the original 800mV specification.

Mechanical Compatibility: Both devices utilize identical through-hole TO-92-3 packaging, ensuring direct pin-for-pin compatibility in existing PCB layouts without modification.

Product Status and Compliance: The SS8550DBU carries Active product status, ensuring ongoing availability and manufacturing support. The device meets ROHS3 compliance and REACH unaffected status, satisfying current regulatory requirements for new designs and production runs.

Supply Chain Availability: The SS8550DBU maintains substantial inventory (80,155 pieces in stock) compared to the obsolete SS8550-D-BP, providing reliable sourcing for immediate and future requirements.

Frequently Asked Questions (FAQ)

Q: Can the SS8550DBU be used as a direct replacement for the SS8550-D-BP in existing designs?

A: Yes. The SS8550DBU is electrically and mechanically equivalent to the SS8550-D-BP. Both devices share identical maximum ratings for collector current, collector-emitter breakdown voltage, power dissipation, and DC current gain. The TO-92-3 package pinout is identical, enabling direct substitution without circuit modification.

Q: What are the key differences between these two parts?

A: The primary differences are product status and manufacturing source. The SS8550-D-BP is obsolete and manufactured by Micro Commercial Co. The SS8550DBU is active and manufactured by onsemi. The SS8550DBU offers improved performance characteristics: transition frequency of 200MHz versus 190MHz, and Vce saturation of 500mV versus 800mV. Both devices meet or exceed the original electrical specifications.

Q: Are there any compliance or certification differences?

A: The SS8550-D-BP is RoHS Compliant. The SS8550DBU is ROHS3 Compliant and REACH Unaffected, representing current regulatory standards. Both devices carry EAR99 ECCN classification and identical HTSUS codes.

Q: Does the improved transition frequency of the SS8550DBU affect circuit operation?

A: No. Higher transition frequency is a performance enhancement that does not negatively impact circuit operation. Circuits designed for 190MHz operation will function correctly with a 200MHz device. The higher frequency capability provides additional design margin for switching applications.

Q: Is the lower Vce saturation of the SS8550DBU beneficial?

A: Yes. Lower Vce saturation (500mV versus 800mV) reduces power dissipation during saturation operation, improving overall circuit efficiency. This represents a performance improvement over the original specification.

Q: What is the moisture sensitivity level of the SS8550DBU?

A: The SS8550DBU carries Not Applicable moisture sensitivity level, indicating no special moisture handling requirements during storage or assembly.