S8550 Equivalent & Substitute Parts

Part Overview

The S8550 is a PNP bipolar junction transistor (BJT) manufactured by UMW, designed for general-purpose switching and amplification applications. This Surface Mount device in SOT-23 packaging operates at 25V maximum collector-emitter breakdown voltage with a maximum collector current of 500mA and power dissipation of 300mW. The S8550 maintains an active product status with extensive inventory availability of 1,169,200 pieces in stock. Equivalent and substitute parts are identified to support design flexibility, supply chain continuity, and application-specific requirements where alternative manufacturers or enhanced specifications are beneficial.

Substiute Parts

S8550

UMWIn Stock: 1169243S8550 Datasheet

Current PartRFQ

MMS8550HE3-L-TP

Micro Commercial CoIn Stock: 6953MMS8550HE3-L-TP Datasheet

Parametric EquivalentRFQ

S8550

EVVO SemiIn Stock: 1169306S8550 Datasheet

Parametric EquivalentRFQ

S9012

EVVO SemiIn Stock: 545489S9012 Datasheet

Parametric EquivalentRFQ

S9013

EVVO SemiIn Stock: 365311S9013 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the S8550 are identified based on strict parametric equivalence across electrical and mechanical specifications. The primary substitution criteria include transistor type (PNP), maximum collector-emitter breakdown voltage (25V), maximum collector current (500mA), power dissipation (300mW), transition frequency (150MHz), saturation voltage characteristics, DC current gain, and Surface Mount SOT-23 packaging.

Parametric Equivalent Parts (PNP Type):

• MMS8550HE3-L-TP (Micro Commercial Co)
• S8550 (EVVO Semi)
• S9012 (EVVO Semi)

These parts maintain identical electrical specifications to the primary S8550 part and are directly interchangeable in circuit applications requiring PNP transistor functionality.

Non-Equivalent Part (Different Transistor Type):

• S9013 (EVVO Semi) — NPN type transistor

The S9013 shares identical electrical ratings (25V, 500mA, 300mW, 150MHz) and SOT-23 packaging but operates as an NPN transistor. This part is not a direct substitute for PNP applications and requires circuit topology modification.

Parameter Comparison

Engineering Selection Recommendations

Direct PNP Substitutes (Recommended for Pin-Compatible Replacement):

The MMS8550HE3-L-TP, S8550 (EVVO Semi), and S9012 are parametrically equivalent to the primary S8550 part. All three maintain identical electrical specifications across voltage, current, power, and frequency parameters. Selection among these three parts is based on availability, packaging format preference (Tape & Reel versus Cut Tape), and supply chain requirements. The MMS8550HE3-L-TP includes AEC-Q101 automotive qualification and extended operating temperature range (-55°C to 150°C), making it suitable for automotive and extended-temperature applications. The EVVO Semi variants (S8550 and S9012) provide equivalent performance with standard industrial temperature range specifications.

Inventory and Availability:

The primary S8550 (UMW) maintains the highest inventory level at 1,169,200 pieces. The S8550 (EVVO Semi) provides equivalent availability at 1,169,200 pieces. The S9012 (EVVO Semi) offers 545,400 pieces in stock. The MMS8550HE3-L-TP provides 6,928 pieces with automotive qualification.

Non-Equivalent Alternative (NPN Type):

The S9013 is not a direct substitute for PNP applications. This NPN transistor shares identical electrical ratings and SOT-23 packaging but requires circuit topology modification and is suitable only for applications requiring NPN functionality.

Compliance and Regulatory Status:

All identified parts maintain ROHS3 compliance, MSL Level 1 (Unlimited moisture sensitivity), and REACH unaffected status. The MMS8550HE3-L-TP additionally carries AEC-Q101 automotive qualification for applications requiring automotive-grade components.

Frequently Asked Questions (FAQ)

Q: Can the MMS8550HE3-L-TP replace the S8550 in existing designs?

A: Yes. The MMS8550HE3-L-TP is a parametric equivalent with identical electrical specifications (25V, 500mA, 300mW, 150MHz) and SOT-23 packaging. The primary differences are packaging format (Tape & Reel versus Cut Tape) and extended operating temperature range (-55°C to 150°C versus 0°C to 150°C). Pin configuration and electrical performance are identical.

Q: What is the difference between S9012 and S9013?

A: S9012 is a PNP transistor while S9013 is an NPN transistor. Both share identical electrical ratings (25V, 500mA, 300mW, 150MHz) and SOT-23 packaging. These are not interchangeable without circuit modification due to opposite polarity requirements.

Q: Is the S9013 suitable as a substitute for the S8550?

A: No. The S9013 is an NPN transistor while the S8550 is a PNP transistor. Although electrical ratings are identical, the opposite transistor type requires circuit topology changes and is not a direct pin-compatible substitute.

Q: What are the packaging differences among substitute parts?

A: The S8550 (UMW) and S9012 are supplied in Cut Tape (CT) & Digi-Reel format. The MMS8550HE3-L-TP is supplied in Tape & Reel (TR) format. All three use identical SOT-23-3 package geometry and are mechanically compatible with standard surface mount assembly processes.

Q: Does the MMS8550HE3-L-TP offer advantages over the standard S8550?

A: The MMS8550HE3-L-TP provides AEC-Q101 automotive qualification and extended operating temperature range (-55°C to 150°C). These features are beneficial for automotive applications and environments requiring operation below 0°C. Electrical performance is identical to the standard S8550.

Q: Are all substitute parts RoHS compliant?

A: Yes. All identified substitute parts (MMS8550HE3-L-TP, S8550 EVVO Semi, S9012, and S9013) are ROHS3 compliant with MSL Level 1 (Unlimited) moisture sensitivity rating.

Q: What inventory levels are available for each substitute part?

A: S8550 (UMW): 1,169,200 pieces; S8550 (EVVO Semi): 1,169,200 pieces; S9012 (EVVO Semi): 545,400 pieces; MMS8550HE3-L-TP (Micro Commercial Co): 6,928 pieces.