BC818-25-TP Equivalent & Substitute Parts

Part Overview

The BC818-25-TP is an NPN bipolar junction transistor manufactured by Micro Commercial Co, designed for interface applications in surface mount configurations. This transistor operates at a maximum collector voltage of 25 V with a collector current rating of 500 mA and a transition frequency of 170 MHz. The device is packaged in SOT-23 (TO-236-3) surface mount format with a maximum power dissipation of 300 mW and operates across a temperature range of -55°C to 150°C. The BC818-25-TP maintains active product status with 806 units currently in stock. Equivalent and substitute parts are identified to provide design flexibility, accommodate supply chain variations, and support alternative sourcing strategies while maintaining functional compatibility within specified electrical and mechanical parameters.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Maximum Collector Current (Ic)	500	mA
Maximum Collector-Emitter Breakdown Voltage	25	V
Maximum Power Dissipation	300	mW
Transition Frequency (fT)	170	MHz
Operating Temperature Range	-55 to 150	°C
Package Type	SOT-23 (TO-236-3)	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the BC818-25-TP is determined by compatibility across the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

Transistor type must be NPN
Maximum collector current must be equal to or greater than 500 mA
Maximum collector-emitter breakdown voltage must be equal to or greater than 25 V
Maximum power dissipation must support the application requirements
Operating temperature range must encompass the application environment

Mechanical Compatibility Criteria:

Package type must be SOT-23 (TO-236-3) or equivalent surface mount configuration
Mounting type must be surface mount
Pin configuration must be compatible with TO-236-3 standard

Substitute Parts Identified:

BC818-40LT1G (onsemi) — Direct series equivalent with identical voltage and current ratings, matching package specification, and active product status
2SD2114KT146W (Rohm Semiconductor) — Functional equivalent with reduced voltage rating (20 V) but matching current rating and package type
2SD2114KT146V (Rohm Semiconductor) — Functional equivalent with reduced voltage rating (20 V) but matching current rating and package type

Parameter Comparison

Parameter	BC818-25-TP (Main)	BC818-40LT1G	2SD2114KT146W	2SD2114KT146V
Manufacturer	Micro Commercial Co	onsemi	Rohm Semiconductor	Rohm Semiconductor
Transistor Type	NPN	NPN	NPN	NPN
Maximum Collector Current (Ic)	500 mA	500 mA	500 mA	500 mA
Maximum Collector-Emitter Breakdown Voltage	25 V	25 V	20 V	20 V
Vce Saturation (Max) @ Ib, Ic	700 mV @ 50 mA, 500 mA	700 mV @ 50 mA, 500 mA	400 mV @ 20 mA, 500 mA	400 mV @ 20 mA, 500 mA
Maximum Power Dissipation	300 mW	225 mW	200 mW	200 mW
Transition Frequency (fT)	170 MHz	100 MHz	350 MHz	350 MHz
Operating Temperature Range	-55 to 150 °C	-55 to 150 °C	150 °C (TJ)	150 °C (TJ)
Package Type	SOT-23 (TO-236-3)	SOT-23-3 (TO-236)	SMT3	SMT3
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Active	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

BC818-40LT1G (onsemi) is the primary substitute for the BC818-25-TP. This part maintains identical electrical specifications for collector voltage (25 V) and collector current (500 mA), identical saturation voltage characteristics, and compatible operating temperature range (-55°C to 150°C). The BC818-40LT1G is packaged in SOT-23-3 (TO-236) format, which is mechanically equivalent to the original SOT-23 specification. Both devices share the BC818 base product number, indicating direct series compatibility. The BC818-40LT1G carries ROHS3 compliance and REACH Unaffected status, meeting current regulatory requirements. Inventory availability for BC818-40LT1G is 305,100 units.

2SD2114KT146W and 2SD2114KT146V (Rohm Semiconductor) function as secondary substitutes where voltage derating is acceptable. These parts maintain the 500 mA collector current rating and SOT-23 package compatibility but operate at a reduced maximum collector-emitter breakdown voltage of 20 V. Both variants are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited) and REACH Unaffected status. The 2SD2114KT146W variant has significantly higher inventory availability (234,300 units) compared to 2SD2114KT146V (45,200 units). Selection between these Rohm variants depends on DC current gain requirements: 2SD2114KT146W provides minimum hFE of 1200 at 10 mA and 3 V, while 2SD2114KT146V provides minimum hFE of 820 at 10 mA and 3 V.

Applications operating at collector voltages below 20 V may use the 2SD2114 series without functional limitation. Applications requiring the full 25 V rating must use BC818-40LT1G or the original BC818-25-TP.

Frequently Asked Questions (FAQ)

Q: Can BC818-40LT1G directly replace BC818-25-TP in all applications?

A: Yes. BC818-40LT1G maintains identical maximum collector voltage (25 V), collector current (500 mA), saturation voltage characteristics, and operating temperature range (-55°C to 150°C). The SOT-23-3 package is mechanically and electrically equivalent to SOT-23 (TO-236-3). Both devices are part of the BC818 series and share identical pin configuration.

Q: What is the key limitation of 2SD2114KT146W and 2SD2114KT146V substitutes?

A: The maximum collector-emitter breakdown voltage is reduced to 20 V compared to the original 25 V specification. These parts are suitable only for applications where the collector voltage does not exceed 20 V. Applications requiring operation at voltages between 20 V and 25 V must use BC818-40LT1G or BC818-25-TP.

Q: Are the Rohm 2SD2114 variants interchangeable with each other?

A: Both 2SD2114KT146W and 2SD2114KT146V share identical electrical specifications except for DC current gain (hFE). The 2SD2114KT146W provides higher minimum hFE (1200 @ 10 mA, 3 V) compared to 2SD2114KT146V (820 @ 10 mA, 3 V). Selection depends on circuit requirements for current gain. Both are packaged in SMT3 (SOT-23 equivalent) and operate across the same temperature range.

Q: Do all substitute parts meet current regulatory compliance?

A: BC818-40LT1G, 2SD2114KT146W, and 2SD2114KT146V all carry ROHS3 compliance and REACH Unaffected status. The original BC818-25-TP lists REACH Unaffected status with RoHS status not specified. All parts are classified under ECCN EAR99 and HTSUS 8541.21.0075.

Q: What are the package differences between substitute options?

A: BC818-25-TP and BC818-40LT1G are both specified in SOT-23 (TO-236-3) format. The 2SD2114KT146W and 2SD2114KT146V are specified in SMT3 format. SMT3 and SOT-23 are equivalent three-pin surface mount packages with identical pin spacing and footprint compatibility. All four parts are suitable for automated surface mount assembly.

Q: How do transition frequency differences affect substitution?

A: BC818-25-TP operates at 170 MHz transition frequency. BC818-40LT1G operates at 100 MHz, while 2SD2114KT146W and 2SD2114KT146V operate at 350 MHz. For applications operating below 100 MHz, all substitutes are suitable. For applications requiring operation between 100 MHz and 170 MHz, BC818-25-TP or 2SD2114 series (350 MHz) are appropriate. For applications requiring operation above 170 MHz, only 2SD2114 series (350 MHz) is suitable.

Q: What power dissipation considerations apply to substitutes?

A: BC818-25-TP is rated for 300 mW maximum power dissipation. BC818-40LT1G is rated for 225 mW, while 2SD2114KT146W and 2SD2114KT146V are rated for 200 mW. Applications requiring power dissipation above 225 mW must use BC818-25-TP. Applications operating between 200 mW and 225 mW may use BC818-40LT1G. Applications operating below 200 mW may use any substitute.

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