MMS8550-L-TP Equivalent & Substitute Parts

Part Overview

The MMS8550-L-TP is an active PNP bipolar junction transistor manufactured by Micro Commercial Co, designed for surface mount applications in SOT-23 packaging. This component operates at 25 V collector-emitter breakdown voltage with a maximum collector current of 500 mA and 300 mW power dissipation. The transistor is specified for general-purpose switching and amplification circuits requiring PNP functionality in compact form factors. Equivalent and substitute parts are identified based on matching electrical characteristics and mechanical compatibility within the SOT-23 package family.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) Max	500	mA
Voltage - Collector Emitter Breakdown (Max)	25	V
Vce Saturation (Max) @ Ib, Ic	600 mV @ 50 mA, 500 mA	—
Current - Collector Cutoff (Max)	100	nA
DC Current Gain (hFE) Min @ Ic, Vce	120 @ 50 mA, 1 V	—
Power - Max	300	mW
Frequency - Transition	150	MHz
Operating Temperature Range	-55 to 150	°C
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the MMS8550-L-TP are classified based on electrical parameter equivalence and mechanical compatibility. The substitution logic is determined by the following criteria:

Primary Equivalence Parameters:

Transistor Type: PNP
Collector Current (Ic) Max: 500 mA
Collector-Emitter Breakdown Voltage: 25 V
Power Dissipation: 300 mW
Package Type: SOT-23 (TO-236-3, SC-59, SOT-23-3)
Mounting: Surface Mount

Secondary Compatibility Parameters:

Operating Temperature Range: -55°C to 150°C
RoHS3 Compliance
Vce Saturation characteristics
DC Current Gain (hFE) minimum specifications

Parts meeting all primary equivalence parameters are classified as direct substitutes. Variations in transition frequency (100 MHz vs. 150 MHz) and DC current gain specifications do not preclude substitution when all electrical ratings and package requirements are satisfied.

Parameter Comparison

Parameter	MMS8550-L-TP (Micro Commercial Co)	BC808-25LT1G (onsemi)	S8550 (EVVO Semi)	S9012 (EVVO Semi)
Transistor Type	PNP	PNP	PNP	PNP
Current - Collector (Ic) Max	500 mA	500 mA	500 mA	500 mA
Voltage - Collector Emitter Breakdown (Max)	25 V	25 V	25 V	25 V
Vce Saturation (Max) @ Ib, Ic	600 mV @ 50 mA, 500 mA	700 mV @ 50 mA, 500 mA	600 mV @ 50 mA, 500 mA	600 mV @ 50 mA, 500 mA
Current - Collector Cutoff (Max)	100 nA	100 nA	100 nA	100 nA
DC Current Gain (hFE) Min @ Ic, Vce	120 @ 50 mA, 1 V	160 @ 100 mA, 1 V	120 @ 50 mA, 1 V	120 @ 50 mA, 1 V
Power - Max	300 mW	300 mW	300 mW	300 mW
Frequency - Transition	150 MHz	100 MHz	150 MHz	150 MHz
Operating Temperature Range	-55°C to 150°C	-55°C to 150°C	-55°C to 150°C	-55°C to 150°C
Package / Case	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Parametric Equivalents:

The S8550 (EVVO Semi) and S9012 (EVVO Semi) are direct parametric equivalents to the MMS8550-L-TP. Both parts satisfy all primary electrical specifications, including collector current, breakdown voltage, power dissipation, and saturation characteristics. Both are ROHS3 compliant and operate across the full -55°C to 150°C temperature range. The S8550 and S9012 are available in higher inventory quantities and alternative packaging formats (Cut Tape and Digi-Reel).

Compatible Substitute with Parameter Variation:

The BC808-25LT1G (onsemi) is a compatible substitute that meets all primary electrical and mechanical requirements. This part exhibits a higher Vce saturation specification (700 mV vs. 600 mV) and lower transition frequency (100 MHz vs. 150 MHz). The BC808-25LT1G is ROHS3 compliant and operates within the specified temperature range. Selection of this part is appropriate for applications where the higher saturation voltage and reduced transition frequency do not impact circuit performance.

Compliance and Certification:

All identified substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the MMS8550-L-TP. All parts are classified under ECCN EAR99 and share the same HTSUS commodity code classification.

Frequently Asked Questions (FAQ)

Q: Can the BC808-25LT1G replace the MMS8550-L-TP in all applications?

A: The BC808-25LT1G is electrically compatible for applications where the higher Vce saturation voltage (700 mV vs. 600 mV) and lower transition frequency (100 MHz vs. 150 MHz) are acceptable. Both parts share identical collector current, breakdown voltage, and power dissipation ratings. Verification of circuit performance is necessary when saturation voltage or switching speed are critical design parameters.

Q: What is the difference between the S8550 and S9012?

A: The S8550 and S9012 are parametrically equivalent PNP transistors with identical electrical specifications. Both are manufactured by EVVO Semi and meet the MMS8550-L-TP requirements. The primary difference is inventory availability and series designation. Both parts are suitable for direct substitution.

Q: Are all substitute parts available in SOT-23 packaging?

A: Yes. All identified substitute parts are packaged in SOT-23 (TO-236-3, SC-59, SOT-23-3) surface mount configuration. The BC808-25LT1G is supplied as SOT-23-3 (TO-236). The S8550 and S9012 are supplied as SOT-23. All packages are mechanically and electrically compatible for PCB assembly.

Q: Do the substitute parts meet RoHS and REACH requirements?

A: All substitute parts are ROHS3 compliant and REACH unaffected, matching the compliance status of the MMS8550-L-TP. All parts are suitable for applications requiring environmental compliance certification.

Q: What is the significance of the DC Current Gain (hFE) variation between parts?

A: The MMS8550-L-TP, S8550, and S9012 specify a minimum hFE of 120 at 50 mA collector current. The BC808-25LT1G specifies a minimum hFE of 160 at 100 mA collector current. These specifications define the minimum current amplification at different operating points. Selection depends on circuit bias conditions and required gain characteristics at the intended operating current.

Q: Can these parts be used interchangeably in tape and reel packaging?

A: The MMS8550-L-TP is supplied in Tape & Reel (TR) format. The S8550 and S9012 are supplied in Cut Tape (CT) and Digi-Reel format. The BC808-25LT1G is supplied in Tape & Reel format. Packaging format selection depends on assembly equipment compatibility and production volume requirements. All formats contain identical electrical components.

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