8550SS-C-BP Equivalent & Substitute Parts

Part Overview

The 8550SS-C-BP is a Bipolar (BJT) Transistor with PNP configuration manufactured by Micro Commercial Co. It is rated for 25 V collector-emitter breakdown voltage and 1.5 A maximum collector current in a Through Hole TO-92 package. The device operates across a temperature range of -55°C to 150°C and delivers 1 W maximum power dissipation with a transition frequency of 100 MHz.

This part is currently classified as Obsolete. Locating equivalent substitute components is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production or repair requirements for legacy systems utilizing this transistor.

Substiute Parts

8550SS-C-BP

Micro Commercial CoIn Stock: 7678550SS-C-BP Datasheet

Current PartRFQ

SS8550DBU

onsemiIn Stock: 80199SS8550DBU Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 8550SS-C-BP is determined by strict equivalence across the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Transistor Type: PNP configuration
• Current - Collector (Ic) Max: 1.5 A minimum
• Voltage - Collector Emitter Breakdown (Max): 25 V minimum
• Power - Max: 1 W minimum
• Vce Saturation characteristics: 500 mV @ 80 mA, 800 mA
• Current - Collector Cutoff (Max): 100 nA maximum

Mechanical Equivalence Criteria:

• Mounting Type: Through Hole
• Package / Case: TO-92-3 (TO-226AA)

Compliance Criteria:

• RoHS Status: RoHS Compliant or equivalent
• ECCN: EAR99
• HTSUS: 8541.29.0075

The substitute part SS8550DBU meets all mandatory electrical and mechanical parameters. Enhanced performance characteristics (higher transition frequency and DC current gain) do not disqualify substitution, as they represent improvements within the same functional category.

Parameter Comparison

Engineering Selection Recommendations

The SS8550DBU manufactured by onsemi is a direct functional substitute for the 8550SS-C-BP. Selection of this substitute is supported by the following engineering factors:

Product Status: The 8550SS-C-BP is Obsolete, while SS8550DBU is Active in production. This ensures long-term supply availability and continued manufacturer support for the substitute part.

Electrical Compatibility: All critical electrical parameters match or exceed the original specification. The substitute maintains identical maximum ratings for collector current (1.5 A), collector-emitter breakdown voltage (25 V), saturation characteristics, and cutoff current. Enhanced DC current gain (160 vs. 120 minimum) and transition frequency (200 MHz vs. 100 MHz) provide performance margin without introducing incompatibility.

Mechanical Compatibility: Both parts utilize identical Through Hole mounting and TO-92-3 package configuration, ensuring direct physical and electrical pin compatibility in existing circuit board layouts.

Compliance: Both parts carry EAR99 ECCN classification and HTSUS code 8541.29.0075. The substitute meets ROHS3 compliance, which supersedes the original RoHS Compliant status. REACH Unaffected status of the substitute indicates no regulatory restrictions on use.

Supply Chain: SS8550DBU maintains substantial inventory (80,155 pieces) in active stock, supporting immediate procurement for production or repair applications.

Frequently Asked Questions (FAQ)

Q: Can SS8550DBU be used as a direct replacement for 8550SS-C-BP in existing designs?

A: Yes. SS8550DBU meets all electrical and mechanical specifications required for direct substitution. Identical pin configuration, package type (TO-92-3), and electrical ratings ensure compatibility without circuit modification.

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

A: The primary differences are manufacturer (Micro Commercial Co vs. onsemi) and product status (Obsolete vs. Active). SS8550DBU offers enhanced performance with higher DC current gain (160 vs. 120 minimum) and transition frequency (200 MHz vs. 100 MHz). These improvements do not affect compatibility and provide additional design margin.

Q: Are there any temperature range limitations when substituting?

A: No. SS8550DBU operates to 150°C maximum junction temperature, covering the upper operating range of the original part. The original part specified -55°C to 150°C; the substitute covers the critical upper temperature boundary. For applications requiring the full -55°C lower limit, thermal performance should be verified against specific circuit requirements.

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

A: No. Higher transition frequency (200 MHz vs. 100 MHz) represents improved high-frequency performance and does not degrade operation in circuits designed for the original 100 MHz specification. This parameter is a maximum rating; actual circuit operation depends on circuit design, not on exceeding this specification.

Q: Are there any compliance or regulatory differences?

A: Both parts carry identical ECCN (EAR99) and HTSUS (8541.29.0075) classifications. SS8550DBU meets ROHS3 compliance, which is the current standard superseding the original RoHS Compliant designation. REACH Unaffected status indicates no additional regulatory restrictions.

Q: What is the inventory status for each part?

A: 8550SS-C-BP has 710 pieces in stock but is Obsolete with no ongoing production. SS8550DBU has 80,155 pieces in active stock with ongoing production support, ensuring long-term availability for future procurement.

Q: Can these parts be used interchangeably in high-frequency applications?

A: Yes. Both parts are rated for 100 MHz minimum transition frequency. SS8550DBU's 200 MHz rating provides additional margin for high-frequency operation. Pin-for-pin compatibility and identical electrical characteristics ensure interchangeable operation across the specified frequency range.