2SC2859-O(TE85L,F) Equivalent & Substitute Parts

Part Overview

The 2SC2859-O(TE85L,F) is an NPN bipolar junction transistor manufactured by Toshiba Semiconductor and Storage, rated for 30V collector-emitter breakdown voltage and 500mA maximum collector current. This device is packaged in a surface mount S-Mini (SOT-23-3) configuration and operates at a maximum junction temperature of 125°C with a transition frequency of 300MHz.

The 2SC2859-O(TE85L,F) is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this transistor topology.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	30	V
Current - Collector (Ic) (Max)	500	mA
Vce Saturation (Max) @ Ib, Ic	250mV @ 10mA, 100mA	—
Current - Collector Cutoff (Max)	100	nA
DC Current Gain (hFE) (Min) @ Ic, Vce	70 @ 100mA, 1V	—
Power - Max	150	mW
Frequency - Transition	300	MHz
Operating Temperature (TJ)	125	°C
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the 2SC2859-O(TE85L,F) is determined by the following critical parameters:

Mandatory Compatibility Parameters:

Transistor Type: NPN
Voltage - Collector Emitter Breakdown (Max): 30V minimum
Package / Case: TO-236-3, SC-59, SOT-23-3 (surface mount)
Mounting Type: Surface Mount

Performance Parameters (Application-Dependent):

Current - Collector (Ic) (Max): 500mA or greater
DC Current Gain (hFE): Minimum 70 at specified operating point
Frequency - Transition: 300MHz or greater
Power - Max: 150mW or greater
Vce Saturation: 250mV or lower at rated conditions

Substitute parts are grouped into two categories based on current handling capability:

Category 1: Direct Current Rating Match (500mA) Parts with Ic(Max) ≥ 500mA provide equivalent or superior current handling without circuit redesign.

Category 2: Reduced Current Rating (100mA) Parts with Ic(Max) = 100mA are suitable for applications where the full 500mA rating is not required. These substitutes maintain voltage, package, and frequency specifications but operate within lower current envelopes.

All substitute parts maintain the SOT-23-3 package footprint, surface mount configuration, and 30V voltage rating. Active product status and RoHS3 compliance are preferred for new designs.

Parameter Comparison

Part Number	Manufacturer	Ic (Max)	Vce(Br)	hFE (Min)	Vce Sat (Max)	Freq (fT)	Power (Max)	Tj (Max)	Status
2SC2859-O(TE85L,F)	Toshiba	500mA	30V	70 @ 100mA, 1V	250mV @ 10mA, 100mA	300MHz	150mW	125°C	Obsolete
2SD2657KT146	Rohm	1.5A	30V	270 @ 100mA, 2V	350mV @ 50mA, 1A	330MHz	200mW	150°C	Active
BC848A-7-F	Diodes Inc.	100mA	30V	110 @ 2mA, 5V	600mV @ 5mA, 100mA	300MHz	300mW	150°C	Active
BC848A-TP	Micro Commercial Co	100mA	30V	110 @ 2mA, 5V	500mV @ 5mA, 100mA	100MHz	225mW	150°C	Active
BC848ALT1G	onsemi	100mA	30V	110 @ 2mA, 5V	600mV @ 5mA, 100mA	100MHz	300mW	150°C	Active
BC848B,215	Nexperia	100mA	30V	200 @ 2mA, 5V	600mV @ 5mA, 100mA	100MHz	250mW	150°C	Active
BC848B,235	Nexperia	100mA	30V	200 @ 2mA, 5V	600mV @ 5mA, 100mA	100MHz	250mW	150°C	Active
BC848B-13-F	Diodes Inc.	100mA	30V	450 @ 2mA, 5V	600mV @ 5mA, 100mA	300MHz	310mW	150°C	Active
BC848B-7-F	Diodes Inc.	100mA	30V	200 @ 2mA, 5V	600mV @ 5mA, 100mA	300MHz	300mW	150°C	Active
BC848B-TP	Micro Commercial Co	100mA	30V	200 @ 2mA, 5V	500mV @ 5mA, 100mA	100MHz	225mW	150°C	Active
BC848BE6327HTSA1	Infineon	100mA	30V	200 @ 2mA, 5V	600mV @ 5mA, 100mA	250MHz	330mW	150°C	Last Time Buy

Engineering Selection Recommendations

For Direct Replacement (Full Current Capability):

The 2SD2657KT146 (Rohm Semiconductor) is the primary substitute for applications requiring the full 500mA collector current specification. This part exceeds the original 2SC2859-O(TE85L,F) in all critical parameters: 1.5A maximum collector current, 330MHz transition frequency, 200mW power rating, and 150°C maximum junction temperature. The 2SD2657KT146 is active product status with RoHS3 compliance and REACH unaffected designation, supporting long-term supply chain continuity.

For Current-Limited Applications (100mA Maximum):

When application requirements limit collector current to 100mA or less, multiple active substitutes are available:

BC848B-13-F (Diodes Incorporated): Offers 300MHz transition frequency matching the original specification, 310mW power rating, and 450 hFE minimum gain. Active status with RoHS3 compliance.
BC848B-7-F (Diodes Incorporated): Provides 300MHz transition frequency, 300mW power rating, and 200 hFE minimum gain. Active status with RoHS3 compliance and extended operating temperature range (-65°C to 150°C).
BC848B,215 and BC848B,235 (Nexperia): Both variants deliver 100mA current rating, 30V voltage rating, and AEC-Q101 automotive qualification. Active status with RoHS3 compliance. The ,215 variant uses Cut Tape packaging; the ,235 variant uses Tape & Reel packaging.
BC848ALT1G (onsemi): Provides 100mA current rating, 300mW power rating, and 100MHz transition frequency. Active status with RoHS3 compliance.

All substitute parts maintain the SOT-23-3 surface mount package footprint and 30V collector-emitter breakdown voltage. Selection between substitutes depends on specific application requirements for transition frequency, power dissipation, current gain, and saturation voltage characteristics.

Frequently Asked Questions (FAQ)

Q: Can the 2SC2859-O(TE85L,F) be replaced with a 100mA-rated transistor in my application?

A: Substitution with 100mA-rated parts is valid only if your circuit design operates the transistor at collector currents not exceeding 100mA. The 2SC2859-O(TE85L,F) is rated for 500mA maximum; therefore, applications utilizing the full current capability require substitutes with equivalent or higher current ratings, such as the 2SD2657KT146 (1.5A).

Q: Are all substitute parts compatible with the original SOT-23-3 footprint?

A: All listed substitute parts use the TO-236-3, SC-59, or SOT-23-3 package designation, which are mechanically and electrically equivalent surface mount packages. PCB footprints designed for the original 2SC2859-O(TE85L,F) accommodate all listed substitutes without modification.

Q: What is the difference between BC848A and BC848B variants?

A: The BC848A and BC848B variants differ in DC current gain (hFE) specifications. BC848A devices specify minimum hFE of 110 at 2mA, 5V. BC848B devices specify minimum hFE of 200 at 2mA, 5V. Both maintain identical voltage, current, and package specifications. Selection depends on circuit requirements for current gain characteristics.

Q: Which substitute offers the closest performance match to the original 2SC2859-O(TE85L,F)?

A: The 2SD2657KT146 provides the closest performance match, exceeding the original specification in collector current (1.5A vs. 500mA), transition frequency (330MHz vs. 300MHz), power rating (200mW vs. 150mW), and maximum junction temperature (150°C vs. 125°C). This part is active product status with full RoHS3 compliance.

Q: Can I use BC848 series transistors as direct substitutes for the 2SC2859-O(TE85L,F)?

A: BC848 series transistors are suitable substitutes only for applications where collector current does not exceed 100mA. The 2SC2859-O(TE85L,F) is rated for 500mA; therefore, BC848 variants are appropriate for reduced-current applications. For full 500mA capability, the 2SD2657KT146 is required.

Q: What is the significance of the "Last Time Buy" status for BC848BE6327HTSA1?

A: Last Time Buy status indicates that Infineon Technologies will discontinue this part after a specified date. While currently available, this part is not recommended for new designs. Active alternatives such as BC848B-7-F or BC848B-13-F are preferred for long-term supply chain security.

Q: Do all substitute parts meet RoHS3 compliance?

A: All listed substitute parts are RoHS3 compliant. The original 2SC2859-O(TE85L,F) is classified as obsolete and does not carry RoHS3 certification. Substitution with RoHS3-compliant parts ensures compliance with current environmental and regulatory requirements.

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in multiple packaging formats: Cut Tape (CT) & Digi-Reel®, Tape & Reel (TR), and individual reel configurations. Selection depends on procurement volume and assembly process requirements. All variants maintain identical electrical specifications and SOT-23-3 footprint compatibility.

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