2SC24050RL Equivalent & Substitute Parts

Part Overview

The 2SC24050RL is an NPN bipolar junction transistor manufactured by Panasonic Electronic Components, designed for small-signal switching and amplification applications. This device features a 35 V collector-emitter breakdown voltage, 50 mA maximum collector current, and 200 mW power dissipation in a surface mount Mini3-G1 package. The part is classified as obsolete, necessitating identification of functionally equivalent alternatives from active manufacturers for new designs and ongoing production requirements.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	35	V
Current - Collector (Ic) (Max)	50	mA
Power - Max	200	mW
Frequency - Transition	200	MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	180 @ 2mA, 5V	—
Vce Saturation (Max) @ Ib, Ic	600mV @ 10mA, 100mA	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Mounting Type	Surface Mount	—
Operating Temperature (Max)	150	°C
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the 2SC24050RL is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

Transistor type must be NPN
Collector-emitter breakdown voltage (VCEO) must be greater than or equal to 35 V
Maximum collector current (Ic) must be greater than or equal to 50 mA
Maximum power dissipation must be greater than or equal to 200 mW
DC current gain (hFE) must support the intended bias conditions
Transition frequency should be sufficient for the application bandwidth

Mechanical Compatibility Criteria:

Package must be TO-236-3, SC-59, or SOT-23-3 (surface mount)
Mounting type must be surface mount
Pin configuration must be compatible with the original footprint

Compliance Considerations:

RoHS compliance status differs between the main part (non-compliant) and active substitutes (ROHS3 compliant)
Product status transitions from obsolete to active alternatives

The substitute parts listed below meet or exceed the electrical specifications of the 2SC24050RL while maintaining package and mounting compatibility. Substitutes with higher voltage ratings, current ratings, or power dissipation provide design margin and are functionally acceptable. Substitutes with lower transition frequencies remain suitable for applications not requiring the full 200 MHz bandwidth.

Parameter Comparison

Part Number	Manufacturer	Ic (Max)	VCEO (Max)	Power (Max)	fT	hFE (Min)	Package	Product Status	RoHS
2SC24050RL	Panasonic	50 mA	35 V	200 mW	200 MHz	180 @ 2mA, 5V	SOT-23-3	Obsolete	Non-compliant
2SD2657KT146	Rohm Semiconductor	1.5 A	30 V	200 mW	330 MHz	270 @ 100mA, 2V	SOT-23-3	Active	ROHS3 Compliant
BC848ALT1G	onsemi	100 mA	30 V	300 mW	100 MHz	110 @ 2mA, 5V	SOT-23-3	Active	ROHS3 Compliant
BC848B,215	Nexperia USA Inc.	100 mA	30 V	250 mW	100 MHz	200 @ 2mA, 5V	SOT-23-3	Active	ROHS3 Compliant
BC848B,235	Nexperia USA Inc.	100 mA	30 V	250 mW	100 MHz	200 @ 2mA, 5V	SOT-23-3	Active	ROHS3 Compliant
BC848B-7-F	Diodes Incorporated	100 mA	30 V	300 mW	300 MHz	200 @ 2mA, 5V	SOT-23-3	Active	ROHS3 Compliant
BC848BE6327HTSA1	Infineon Technologies	100 mA	30 V	330 mW	250 MHz	200 @ 2mA, 5V	SOT-23-3	Last Time Buy	ROHS3 Compliant
BC848BLT1G	onsemi	100 mA	30 V	300 mW	100 MHz	200 @ 2mA, 5V	SOT-23-3	Active	ROHS3 Compliant
BC848C-7-F	Diodes Incorporated	100 mA	30 V	300 mW	300 MHz	420 @ 2mA, 5V	SOT-23-3	Active	ROHS3 Compliant
BC848CLT1G	onsemi	100 mA	30 V	300 mW	100 MHz	420 @ 2mA, 5V	SOT-23-3	Active	ROHS3 Compliant
BC849B,215	Nexperia USA Inc.	100 mA	30 V	250 mW	100 MHz	200 @ 2mA, 5V	SOT-23-3	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes for Active Production:

The BC848BLT1G (onsemi) and BC848B,215 (Nexperia USA Inc.) are recommended as primary substitutes. Both devices are in active production status with ROHS3 compliance, ensuring long-term availability and regulatory alignment. These parts exceed the 2SC24050RL specifications in collector current (100 mA vs. 50 mA) and power dissipation (300 mW and 250 mW respectively vs. 200 mW), providing design margin. The 30 V collector-emitter breakdown voltage is lower than the original 35 V specification but remains suitable for applications designed within this constraint.

Secondary Substitutes with Enhanced Performance:

The BC848B-7-F (Diodes Incorporated) and BC848C-7-F (Diodes Incorporated) offer higher transition frequencies (300 MHz vs. 200 MHz) and extended operating temperature ranges (-65°C to 150°C), supporting applications requiring broader thermal performance. The BC848C-7-F variant provides higher DC current gain (420 vs. 200), beneficial for low-bias-current applications.

Compliance Transition:

All recommended substitutes are ROHS3 compliant, addressing the non-compliant status of the obsolete 2SC24050RL. This transition is necessary for designs targeting markets with RoHS regulatory requirements.

Voltage Rating Consideration:

The 2SC24050RL operates at 35 V maximum collector-emitter breakdown voltage. All substitute parts operate at 30 V maximum. Circuit designs must confirm that the 5 V reduction in voltage rating does not exceed application requirements. For applications requiring 35 V or higher ratings, the 2SD2657KT146 (Rohm Semiconductor) at 30 V maximum also requires verification, though its 1.5 A collector current provides significant margin for higher-power applications.

Packaging and Mounting:

All substitute parts maintain the TO-236-3 / SC-59 / SOT-23-3 surface mount package, ensuring direct footprint compatibility without PCB redesign.

Frequently Asked Questions (FAQ)

Q: Can the BC848BLT1G directly replace the 2SC24050RL without circuit modification?

A: The BC848BLT1G is electrically compatible with the 2SC24050RL in applications where the 30 V collector-emitter breakdown voltage is sufficient. Both devices share the same SOT-23-3 package and surface mount configuration. However, circuit designs must confirm that operating voltages do not exceed 30 V. The higher collector current rating (100 mA vs. 50 mA) and power dissipation (300 mW vs. 200 mW) of the BC848BLT1G provide additional design margin.

Q: What is the significance of the voltage rating difference between the 2SC24050RL (35 V) and substitute parts (30 V)?

A: The 2SC24050RL is rated for 35 V maximum collector-emitter breakdown voltage, while most substitutes are rated at 30 V. This 5 V difference must be evaluated against the actual operating voltages in the circuit. If the circuit operates below 30 V, substitution is straightforward. If the circuit requires operation between 30 V and 35 V, the substitute part is not suitable without circuit redesign to reduce operating voltage.

Q: Are there differences in DC current gain (hFE) between the 2SC24050RL and substitute parts?

A: Yes. The 2SC24050RL specifies a minimum hFE of 180 at 2 mA and 5 V. Most BC848 variants specify 200 or higher at the same conditions, with BC848C variants reaching 420. Higher hFE values reduce base current requirements for a given collector current, which can improve circuit efficiency. Lower hFE values (such as BC848ALT1G at 110) require higher base drive but remain functionally acceptable if the circuit design accommodates this requirement.

Q: What is the difference between BC848B,215 and BC848B,235?

A: Both parts are identical in electrical specifications and performance. The difference is in packaging format: BC848B,215 is supplied in Cut Tape (CT) & Digi-Reel format, while BC848B,235 is supplied in Tape & Reel (TR) format. Selection between these variants depends on assembly line requirements and tape reel compatibility.

Q: Why is the 2SD2657KT146 listed as a substitute despite its 1.5 A collector current rating?

A: The 2SD2657KT146 exceeds the 2SC24050RL specifications in collector current (1.5 A vs. 50 mA), power dissipation (200 mW, same), and transition frequency (330 MHz vs. 200 MHz). While this part is suitable for applications requiring higher current handling, it is not necessary for designs limited to 50 mA operation. The 30 V collector-emitter breakdown voltage requires the same voltage rating verification as other substitutes.

Q: What does "Last Time Buy" status mean for the BC848BE6327HTSA1?

A: "Last Time Buy" indicates that the manufacturer (Infineon Technologies) has announced end-of-life for this part. While currently available, production will cease at a specified date. This part is suitable for immediate substitution but should not be selected for new long-term production designs. Active status parts such as BC848BLT1G or BC848B,215 are preferred for designs requiring extended component availability.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed are ROHS3 compliant, addressing the non-compliant status of the obsolete 2SC24050RL. This compliance is necessary for designs targeting markets with RoHS regulatory requirements, including the European Union and many other jurisdictions.

Q: What is the significance of transition frequency (fT) differences?

A: The 2SC24050RL specifies 200 MHz transition frequency. Substitute parts range from 100 MHz (BC848ALT1G, BC848BLT1G, BC848CLT1G, BC849B,215) to 330 MHz (2SD2657KT146). Higher transition frequencies support faster switching and higher-frequency amplification. Lower transition frequencies are suitable for applications not requiring the full 200 MHz bandwidth. Selection depends on the specific application frequency requirements.

Q: Can the BC849B,215 be used interchangeably with BC848 variants?

A: The BC849B,215 shares identical electrical specifications with BC848B variants (100 mA collector current, 30 V breakdown voltage, 250 mW power dissipation, 100 MHz transition frequency). The BC849 designation indicates a different internal design or manufacturing process, but electrical performance is equivalent. Both are suitable substitutes for the 2SC24050RL. Selection between BC848 and BC849 variants depends on component availability and supply chain preferences.

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