SS8550-C-BP Equivalent & Substitute Parts

Part Overview

The SS8550-C-BP is a PNP bipolar junction transistor manufactured by Micro Commercial Co, designed for general-purpose switching and amplification applications. It features a maximum collector current of 1.5 A, collector-emitter breakdown voltage of 25 V, and 1 W power dissipation capability in a Through Hole TO-92 package.

The SS8550-C-BP is classified as an obsolete product. Locating equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for legacy systems utilizing this component.

Substiute Parts

SS8550-C-BP

Micro Commercial CoIn Stock: 1164SS8550-C-BP Datasheet

Current PartRFQ

SS8550CBU

onsemiIn Stock: 21322SS8550CBU Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SS8550-C-BP are identified based on strict electrical and mechanical parameter matching within the allowed tolerances for PNP bipolar junction transistors in the TO-92 package category.

The substitution criteria are:

• Transistor Type: Must be PNP
• Current Rating: Collector current (Ic) must be ≥ 1.5 A
• Voltage Rating: Collector-emitter breakdown voltage must be ≥ 25 V
• Power Dissipation: Maximum power rating must be ≥ 1 W
• Frequency Response: Transition frequency must be ≥ 190 MHz
• DC Current Gain: hFE minimum must be ≥ 120 @ specified conditions
• Package Type: TO-92 Through Hole configuration
• Operating Temperature: Must support the required temperature range

Parts meeting these criteria are electrically and mechanically compatible for direct substitution in applications designed for the SS8550-C-BP.

Parameter Comparison

Engineering Selection Recommendations

The SS8550CBU manufactured by onsemi is a direct electrical and mechanical substitute for the SS8550-C-BP. Both parts share identical maximum ratings for collector current (1.5 A), collector-emitter breakdown voltage (25 V), power dissipation (1 W), and DC current gain specifications.

The SS8550CBU offers the following advantages:

• Active Product Status: The SS8550CBU is an active product with established supply chain availability (21,300 pcs in stock), whereas the SS8550-C-BP is obsolete.
• Improved Performance: The SS8550CBU demonstrates lower saturation voltage (500mV vs. 800mV) and higher transition frequency (200MHz vs. 190MHz), providing enhanced switching performance.
• Regulatory Compliance: Both parts are RoHS compliant. The SS8550CBU carries ROHS3 certification and is REACH unaffected, meeting current regulatory requirements.
• Identical Pinout and Package: Both transistors use the TO-92-3 package with identical pin configuration, enabling direct board-level substitution without layout modifications.

Selection of the SS8550CBU is supported by product availability, compliance status, and superior electrical performance characteristics within the specified parameter envelope.

Frequently Asked Questions (FAQ)

Q: Can the SS8550CBU be used as a direct replacement for the SS8550-C-BP without circuit modifications?

A: Yes. The SS8550CBU is electrically and mechanically compatible with the SS8550-C-BP. Both transistors share identical maximum ratings for current, voltage, power, and gain. The TO-92-3 package pinout is identical, permitting direct substitution on printed circuit boards without layout changes.

Q: What is the difference in saturation voltage between these parts?

A: The SS8550-C-BP has a maximum saturation voltage of 800mV at the specified bias conditions, while the SS8550CBU has a maximum saturation voltage of 500mV. The lower saturation voltage of the SS8550CBU results in reduced power dissipation during saturation operation and improved switching efficiency.

Q: Are both parts RoHS compliant?

A: Yes. The SS8550-C-BP is RoHS compliant. The SS8550CBU is ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards for electronic components.

Q: Why is the SS8550-C-BP classified as obsolete?

A: The SS8550-C-BP is no longer in active production. The SS8550CBU from onsemi serves as the active equivalent, with established manufacturing and distribution channels supporting ongoing supply requirements.

Q: Are there any frequency or speed differences between these transistors?

A: The SS8550CBU has a transition frequency of 200MHz compared to 190MHz for the SS8550-C-BP. This 10MHz difference is within the performance envelope for general-purpose switching applications and does not restrict substitution compatibility.

Q: What is the operating temperature range for each part?

A: The SS8550-C-BP operates from -55°C to 150°C junction temperature. The SS8550CBU specification indicates operation up to 150°C junction temperature. For applications requiring the full -55°C lower temperature limit, verification against the SS8550CBU datasheet is necessary.

Q: Is the SS8550CBU available in the same packaging as the SS8550-C-BP?

A: Yes. Both transistors are supplied in the TO-92-3 (TO-226AA) Through Hole package. The SS8550CBU is available in bulk packaging, suitable for production assembly and repair operations.