S8550 Equivalent & Substitute Parts Reference

Part Overview

The S8550 (Manufacturer Part Number: S8550, EVVO Semi) is a PNP bipolar junction transistor (BJT) designed for general-purpose amplification and switching applications. It features a maximum collector current of 500 mA, collector-emitter voltage of 25 V, and transition frequency of 150 MHz. The device is supplied in a surface-mount SOT-23 package and conforms to RoHS3 environmental requirements with an MSL rating of 1 (unlimited).

Finding alternative models with equivalent electrical and mechanical characteristics is necessary to ensure continuous supply, design flexibility, and qualification across multiple sources in high-volume or cross-platform designs.

Key Parameters

Parameter	Description
Transistor Type	PNP / NPN
Current - Collector (Ic) (Max)	Maximum collector current
Voltage - Collector Emitter Breakdown (Max)	Maximum allowed voltage across collector-emitter terminals
Vce Saturation (Max) @ Ib, Ic	Maximum collector-emitter saturation voltage at specified base and collector current
Current - Collector Cutoff (Max)	Maximum collector cutoff current
DC Current Gain (hFE) (Min) @ Ic, Vce	Minimum DC current gain at specified conditions
Power - Max	Maximum power dissipation
Frequency - Transition	Transition frequency (ft)
Operating Temperature	Maximum junction temperature
Mounting Type	Mechanical mounting method
Package / Case	Outline and footprint
Supplier Device Package	Vendor package reference
RoHS Status	Environmental compliance
Moisture Sensitivity Level (MSL)	MSL classification
Product Status	Lifecycle status

Substitute Part Grouping Explanation

Substitution is based on strict equivalence of primary electrical and mechanical parameters. The following fields are matched for all substitute transistors in this reference:

Transistor Type
Collector Current (Ic) Max
Collector-Emitter Breakdown Voltage (Vce Max)
Collector-Emitter Saturation Voltage (Vce(sat)), specified at Ib and Ic
Collector Cutoff Current Max
DC Current Gain (hFE) Min at defined test conditions
Maximum Power Dissipation
Transition Frequency (ft)
Operating Temperature Range
Mounting Type (Surface Mount)
Package/Case (TO-236-3, SC-59, SOT-23-3)
RoHS Compliance
MSL (Moisture Sensitivity Level)
Product Status (Active)

All substitutes listed meet these parameters exactly as specified in the provided input.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Transistor Type	Ic (Max)	Vce (Max)	Vce(sat) @ Ib, Ic	Ic Cutoff (Max)	hFE (Min) @ Ic, Vce	Power - Max	ft	Operating Temperature	Mounting Type	Package / Case	Supplier Device Package	RoHS Status	MSL	Product Status
S8550	EVVO Semi	PNP	500 mA	25 V	600 mV @ 50 mA, 500 mA	100 nA	120 @ 50 mA, 1 V	300 mW	150 MHz	150°C (TJ)	Surface Mount	TO-236-3, SC-59, SOT-23-3	SOT-23	ROHS3	1	Active
S9012	EVVO Semi	PNP	500 mA	25 V	600 mV @ 50 mA, 500 mA	100 nA	120 @ 50 mA, 1 V	300 mW	150 MHz	-55°C ~ 150°C (TJ)	Surface Mount	TO-236-3, SC-59, SOT-23-3	SOT-23	ROHS3	1	Active
S9013	EVVO Semi	NPN	500 mA	25 V	600 mV @ 50 mA, 500 mA	100 nA	120 @ 50 mA, 1 V	300 mW	150 MHz	-55°C ~ 150°C (TJ)	Surface Mount	TO-236-3, SC-59, SOT-23-3	SOT-23	ROHS3	1	Active
MMS8550HE3-L-TP	Micro Commercial Co	PNP	500 mA	25 V	600 mV @ 50 mA, 500 mA	100 nA	120 @ 50 mA, 1 V	300 mW	150 MHz	-55°C ~ 150°C (TJ)	Surface Mount	TO-236-3, SC-59, SOT-23-3	SOT-23	ROHS3	1	Active
S8550	EVVO Semi	PNP	500 mA	25 V	600 mV @ 50 mA, 500 mA	100 nA	120 @ 50 mA, 1 V	300 mW	150 MHz	150°C (TJ)	Surface Mount	TO-236-3, SC-59, SOT-23-3	SOT-23	ROHS3	1	Active

Engineering Selection Recommendations

All listed equivalents and substitute BJTs match the S8550 in terms of active product status, RoHS3 compliance, and Moisture Sensitivity Level (MSL 1). All substitutes are surface-mountable, meet the same mechanical outline (SOT-23 / TO-236-3 / SC-59), and have electrical parameters identical to the original device.

Frequently Asked Questions (FAQ)

Q1: What key parameters are used for S8550 transistor substitution?
A1: Substitution is based on transistor type, collector current (Ic max), collector-emitter voltage (Vce max), saturation voltage (Vce(sat)), cutoff current, DC current gain (hFE), power dissipation, transition frequency, package, mounting method, operating temperature, product status, RoHS compliance, and MSL rating.

Q2: Are all substitute parts offered in the same package?
A2: Yes. All substitutes are supplied in surface mount SOT-23 (TO-236-3, SC-59, SOT-23-3) packages.

Q3: Can an NPN transistor (such as S9013) be used as a substitute?
A3: Transistor type is a fundamental parameter. NPN and PNP transistors differ in polarity, so substitution is only possible if the circuit design can accommodate both types.

Q4: Are all substitutes RoHS compliant?
A4: Yes. All listed substitutes are RoHS3 Compliant.

Q5: Is there any difference in electrical performance among the substitutes?
A5: Based on the parameters provided, all substitutes have identical electrical specifications.

Q6: What should be considered regarding Moisture Sensitivity Level (MSL)?
A6: All parts are rated as MSL 1 (unlimited floor life), indicating identical handling requirements.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message