MMS8550-H-TP Equivalent & Substitute Parts

Part Overview

The MMS8550-H-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 moderate frequency response up to 150 MHz. Equivalent and substitute parts are identified based on matching electrical characteristics, mechanical compatibility, and package specifications to ensure direct functional replacement in circuit designs.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) Max	500	mA
Voltage - Collector Emitter Breakdown (Max)	25	V
Power - Max	300	mW
Frequency - Transition	150	MHz
Package / Case	SOT-23-3 (TO-236)	—
Mounting Type	Surface Mount	—
Operating Temperature Range	-55 to 150	°C

Substitute Part Grouping Explanation

Substitution of the MMS8550-H-TP is determined by strict equivalence across the following electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor type: PNP configuration
Maximum collector current: 500 mA
Collector-emitter breakdown voltage: 25 V
Maximum power dissipation: 300 mW
Package type: SOT-23-3 (TO-236-3, SC-59)
Mounting configuration: Surface mount

Substitute Classification:

Similar Manufacturer Part (Functional Equivalent with Minor Variations):

BC808-25LT1G (onsemi): Matches all primary electrical specifications. Transition frequency is 100 MHz (lower than MMS8550-H-TP at 150 MHz). Vce saturation is 700 mV at specified conditions (higher than MMS8550-H-TP at 600 mV). DC current gain is 160 @ 100mA, 1V (higher than MMS8550-H-TP at 120 @ 50mA, 1V). Packaging and mounting are identical.

Parametric Equivalents (Full Electrical and Mechanical Match):

S8550 (EVVO Semi): Identical electrical specifications to MMS8550-H-TP including 150 MHz transition frequency, 600 mV Vce saturation, and 120 DC current gain. Packaging and mounting are identical. Packaging format differs (Cut Tape & Digi-Reel vs. Tape & Reel).
S9012 (EVVO Semi): Identical electrical specifications to MMS8550-H-TP including 150 MHz transition frequency, 600 mV Vce saturation, and 120 DC current gain. Packaging and mounting are identical. Packaging format differs (Cut Tape & Digi-Reel vs. Tape & Reel).

Parameter Comparison

Parameter	MMS8550-H-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 @ 50mA, 500mA	700 mV @ 50mA, 500mA	600 mV @ 50mA, 500mA	600 mV @ 50mA, 500mA
Current - Collector Cutoff (Max)	100 nA	100 nA	100 nA	100 nA
DC Current Gain (hFE) (Min) @ Ic, Vce	120 @ 50mA, 1V	160 @ 100mA, 1V	120 @ 50mA, 1V	120 @ 50mA, 1V
Power - Max	300 mW	300 mW	300 mW	300 mW
Frequency - Transition	150 MHz	100 MHz	150 MHz	150 MHz
Operating Temperature Range	-55 to 150 °C	-55 to 150 °C	-55 to 150 °C	-55 to 150 °C
Package / Case	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	Not specified	Not specified

Engineering Selection Recommendations

MMS8550-H-TP (Primary Component): Active product status with full RoHS3 compliance and REACH unaffected designation. Suitable for new designs and production applications requiring 150 MHz transition frequency performance.

S8550 and S9012 (Parametric Equivalents): Both parts provide complete electrical and mechanical equivalence to MMS8550-H-TP with identical transition frequency (150 MHz), saturation voltage (600 mV), and DC current gain specifications. Both are active products with RoHS3 compliance. Selection between these parts and MMS8550-H-TP depends on packaging format requirements (Cut Tape & Digi-Reel availability versus Tape & Reel) and supplier inventory considerations. Parametric equivalence ensures direct functional replacement without circuit redesign.

BC808-25LT1G (Functional Equivalent with Performance Variations): Active product with RoHS3 compliance and MSL Level 1 moisture sensitivity rating. Transition frequency is 100 MHz (50 MHz lower than MMS8550-H-TP), and Vce saturation is 700 mV (100 mV higher than MMS8550-H-TP). DC current gain is 160 @ 100mA, 1V (higher than MMS8550-H-TP). This part is suitable for applications where the lower transition frequency and higher saturation voltage are acceptable within circuit design margins. Applications requiring the full 150 MHz performance specification should not use BC808-25LT1G as a substitute.

Frequently Asked Questions (FAQ)

Q: Can BC808-25LT1G be used as a direct replacement for MMS8550-H-TP?

A: BC808-25LT1G is a functional equivalent with the same package, mounting type, and maximum ratings (25 V, 500 mA, 300 mW). However, it has a lower transition frequency (100 MHz versus 150 MHz) and higher Vce saturation voltage (700 mV versus 600 mV). It is suitable for applications where these performance differences fall within acceptable design margins. Applications specifically requiring 150 MHz frequency response should use S8550 or S9012 instead.

Q: What is the difference between S8550 and S9012?

A: S8550 and S9012 are parametric equivalents with identical electrical specifications including 150 MHz transition frequency, 600 mV Vce saturation, and 120 DC current gain. Both are manufactured by EVVO Semi and supplied in Cut Tape & Digi-Reel packaging. Selection between these parts is based on supplier availability and inventory requirements rather than electrical performance differences.

Q: Are all substitute parts available in the same packaging format?

A: MMS8550-H-TP is supplied in Tape & Reel (TR) format. BC808-25LT1G is supplied in Tape & Reel (TR) format. S8550 and S9012 are supplied in Cut Tape (CT) & Digi-Reel format. Packaging format differences do not affect electrical compatibility but may impact procurement and assembly processes. Verify packaging format requirements with your supply chain before component selection.

Q: Do all substitute parts meet the same compliance standards?

A: MMS8550-H-TP, BC808-25LT1G, S8550, and S9012 are all RoHS3 compliant. MMS8550-H-TP and BC808-25LT1G have REACH unaffected designation. S8550 and S9012 do not specify REACH status in provided documentation. All parts are classified under ECCN EAR99. Verify compliance requirements with your regulatory and procurement departments before final component selection.

Q: What are the key electrical parameters that determine substitution compatibility?

A: Substitution compatibility is determined by matching the following parameters: PNP transistor type, 500 mA maximum collector current, 25 V collector-emitter breakdown voltage, 300 mW maximum power dissipation, and SOT-23-3 surface mount package. Additional parameters including transition frequency, Vce saturation voltage, and DC current gain determine whether a substitute is a parametric equivalent (identical specifications) or a functional equivalent (acceptable performance variations). Applications with specific frequency or saturation voltage requirements must verify these parameters against design specifications.

Q: Can MMS8550-H-TP be used in high-frequency switching applications?

A: MMS8550-H-TP is specified for 150 MHz transition frequency, making it suitable for moderate-frequency switching applications. BC808-25LT1G, with 100 MHz transition frequency, is not recommended for applications requiring the full 150 MHz performance. S8550 and S9012 maintain the 150 MHz specification and are suitable alternatives for high-frequency switching applications requiring parametric equivalence.

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