2SC37570RL Equivalent & Substitute Parts

Part Overview

The 2SC37570RL is an NPN bipolar junction transistor manufactured by Panasonic Electronic Components, rated for 40 V collector-emitter breakdown voltage and 100 mA maximum collector current. This device is packaged in a Surface Mount Mini3-G1 case (TO-236-3/SC-59/SOT-23-3 footprint) and operates at a maximum junction temperature of 150°C with 200 mW power dissipation capability. The 2SC37570RL is classified as an obsolete product. Equivalent and substitute NPN transistors are necessary for applications requiring active production components with comparable electrical characteristics and identical mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	40	V
Current - Collector (Ic) (Max)	100	mA
Power - Max	200	mW
Frequency - Transition	450	MHz
Operating Temperature (Max)	150	°C
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Mounting Type	Surface Mount	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute NPN transistors for the 2SC37570RL are selected based on the following critical parameters:

Electrical Compatibility Requirements:

Transistor Type: NPN (mandatory match)
Voltage - Collector Emitter Breakdown (Max): Minimum 40 V (equal or greater)
Current - Collector (Ic) (Max): Minimum 100 mA (equal or greater)
Power - Max: Minimum 200 mW (equal or greater)
Operating Temperature (Max): 150°C (equal or greater)

Mechanical Compatibility Requirements:

Package / Case: TO-236-3, SC-59, or SOT-23-3 (identical footprint)
Mounting Type: Surface Mount (mandatory match)
Moisture Sensitivity Level (MSL): 1 (Unlimited) or equivalent

All substitute parts listed meet or exceed the electrical specifications of the 2SC37570RL while maintaining identical mechanical compatibility. Substitute parts with higher current ratings, voltage ratings, power dissipation, or frequency capability are electrically compatible and do not require design modification.

Parameter Comparison

Part Number	Manufacturer	Product Status	Ic (Max) mA	Vce Breakdown (Max) V	Power (Max) mW	Frequency MHz	Temp (Max) °C	Package
2SC37570RL	Panasonic Electronic Components	Obsolete	100	40	200	450	150	TO-236-3
BC817-16,215	Nexperia USA Inc.	Active	500	45	250	100	150	TO-236-3
BC817-16,235	Nexperia USA Inc.	Active	500	45	250	100	150	TO-236-3
BC817-16LT1G	onsemi	Active	500	45	300	100	150	TO-236-3
BC817-16LT3G	onsemi	Active	500	45	300	100	150	TO-236-3
BC817-25,215	NXP USA Inc.	Active	500	45	250	100	150	TO-236-3
BC817-25,235	Nexperia USA Inc.	Active	500	45	250	100	150	TO-236-3
BC817-25-7-F	Diodes Incorporated	Active	500	45	310	100	150	TO-236-3
BC817-25-TP	Micro Commercial Co	Active	800	45	310	100	150	TO-236-3
BC817-25LT1G	onsemi	Active	500	45	300	100	150	TO-236-3
BC817-25LT3G	onsemi	Active	500	45	300	100	150	TO-236-3

Engineering Selection Recommendations

All listed substitute parts are classified as Active products, ensuring continued availability and manufacturing support. The following factors apply to component selection:

Product Status Advantage: All substitute parts maintain Active product status, eliminating obsolescence risk associated with the 2SC37570RL. This ensures long-term supply chain stability and access to technical documentation and manufacturing support.

Compliance and Certifications: Multiple substitute options carry AEC-Q101 automotive qualification (BC817-16,215; BC817-16,235; BC817-25,215; BC817-25,235; BC817-25-7-F), indicating compliance with automotive-grade reliability standards. These parts are suitable for applications requiring automotive-level component qualification.

RoHS and Environmental Compliance: Substitute parts from Nexperia USA Inc., onsemi, and Diodes Incorporated carry ROHS3 compliance certification. Parts from Nexperia USA Inc. and onsemi also carry REACH Unaffected status, confirming compliance with European environmental regulations.

Electrical Margin: All substitute parts exceed the 2SC37570RL specifications in collector current (500 mA to 800 mA versus 100 mA), collector-emitter breakdown voltage (45 V versus 40 V), and power dissipation (250 mW to 310 mW versus 200 mW). These margins provide design flexibility and improved reliability in applications operating near maximum ratings.

Packaging and Mechanical Compatibility: All substitute parts utilize identical TO-236-3/SC-59/SOT-23-3 Surface Mount packaging, ensuring direct mechanical compatibility without PCB redesign or assembly process modification.

Frequently Asked Questions (FAQ)

Q: Can BC817 series transistors directly replace the 2SC37570RL without circuit modification?

A: Yes. All BC817 variants listed meet or exceed the electrical specifications of the 2SC37570RL while maintaining identical TO-236-3/SOT-23-3 Surface Mount packaging. No circuit modification is required for direct substitution in applications where the 2SC37570RL operates within its rated specifications.

Q: What is the difference between BC817-16 and BC817-25 variants?

A: The primary difference is DC Current Gain (hFE). BC817-16 variants specify hFE minimum of 100 @ 100mA, 1V. BC817-25 variants specify hFE minimum of 160 @ 100mA, 1V. Both variants are electrically compatible with the 2SC37570RL. Selection between variants depends on application requirements for current gain characteristics.

Q: Are there packaging differences between Nexperia, onsemi, and Diodes Incorporated BC817 parts?

A: All listed parts use TO-236-3/SC-59/SOT-23-3 Surface Mount packaging with identical mechanical footprints. Packaging designations differ by supplier (TO-236AB, SOT-23-3 (TO-236), SOT-23-3) but represent the same physical package. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for all parts, indicating no moisture sensitivity precautions are required.

Q: Which substitute part offers the highest power dissipation capability?

A: BC817-25-7-F (Diodes Incorporated) and BC817-25-TP (Micro Commercial Co) both offer 310 mW maximum power dissipation, compared to 200 mW for the 2SC37570RL. These parts provide the greatest thermal margin for applications with elevated power requirements.

Q: Do all substitute parts carry automotive qualification?

A: No. AEC-Q101 automotive qualification is specified for BC817-16,215; BC817-16,235; BC817-25,215; BC817-25,235; and BC817-25-7-F. onsemi BC817-16LT1G, BC817-16LT3G, BC817-25LT1G, and BC817-25LT3G do not list AEC-Q101 qualification. Micro Commercial Co BC817-25-TP does not list AEC-Q101 qualification. Component selection should consider automotive qualification requirements for specific applications.

Q: What is the significance of the packaging suffix (,215 versus ,235 versus LT1G)?

A: Packaging suffixes indicate supplier-specific packaging formats. Suffix ,215 indicates Cut Tape (CT) & Digi-Reel® packaging. Suffix ,235 indicates Tape & Reel (TR) packaging. Suffix LT1G and LT3G indicate onsemi-specific packaging designations. All represent identical electrical components in identical mechanical packages; selection depends on procurement and assembly process requirements.

Q: Can the 2SC37570RL be used in new designs, or should substitute parts be selected?

A: The 2SC37570RL is classified as Obsolete. New designs should utilize Active substitute parts to ensure long-term component availability, manufacturing support, and supply chain stability. All listed substitute parts are Active and suitable for new design implementation.

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