2SC3265-O-TP Equivalent & Substitute Parts

Part Overview

The 2SC3265-O-TP is an NPN bipolar junction transistor manufactured by Micro Commercial Co, designed for surface mount applications in the SOT-23 package. This component operates at a maximum collector current of 800 mA with a 30 V collector-emitter breakdown voltage and 200 mW power dissipation capability. The device is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and production continuity. Substitute parts must maintain functional compatibility within the specified electrical and mechanical parameters while offering active product status and continued availability.

Key Parameters

Parameter	2SC3265-O-TP	Unit
Transistor Type	NPN	—
Current - Collector (Ic) Max	800	mA
Voltage - Collector Emitter Breakdown (Max)	30	V
Power - Max	200	mW
Frequency - Transition	120	MHz
DC Current Gain (hFE) Min @ Ic, Vce	100 @ 100mA, 1V	—
Operating Temperature Range	-55 to 150	°C
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the 2SC3265-O-TP are selected based on strict electrical and mechanical parameter compatibility. The primary substitution criteria are:

Mandatory Matching Parameters:

Transistor Type: NPN
Package / Case: TO-236-3, SC-59, SOT-23-3 (surface mount)
Mounting Type: Surface Mount
Current - Collector (Ic) Max: 800 mA or greater
Voltage - Collector Emitter Breakdown (Max): 30 V or greater
Power - Max: 200 mW or greater
DC Current Gain (hFE) Min: 100 or greater
Operating Temperature Range: -55°C to 150°C or equivalent upper limit
RoHS Status: ROHS3 Compliant

Substitute parts are grouped into two categories:

Category A - Direct Electrical Equivalents (800 mA Current Rating): Parts maintaining the 800 mA collector current specification with equal or superior voltage and power ratings.

Category B - Functional Substitutes (600 mA Current Rating): Parts with reduced collector current (600 mA) but superior voltage ratings (40 V) and enhanced frequency performance, suitable for applications where the full 800 mA capability is not required.

All substitute parts listed maintain active product status, ensuring continued availability and supply chain reliability.

Parameter Comparison

Part Number	Manufacturer	Ic Max (mA)	Vce Breakdown (V)	Power Max (mW)	Frequency (MHz)	hFE Min @ Ic, Vce	Temp Range (°C)	Product Status
2SC3265-O-TP	Micro Commercial Co	800	30	200	120	100 @ 100mA, 1V	-55 to 150	Obsolete
2SD1781KT146Q	Rohm Semiconductor	800	32	200	150	120 @ 100mA, 3V	-55 to 150	Active
BCW65ALT1G	onsemi	800	32	225	100	100 @ 100mA, 1V	-55 to 150	Active
BSR14	onsemi	800	40	350	300	100 @ 150mA, 10V	-55 to 150	Active
MMBT2222A-G	Comchip Technology	600	40	300	300	100 @ 150mA, 10mV	-55 to 150	Active
MMBT2222ALT1G	onsemi	600	40	225	300	100 @ 150mA, 10V	-55 to 150	Active
MMBT2222ALT3G	onsemi	600	40	300	300	100 @ 150mA, 10V	-55 to 150	Active
MMBT2222LT1G	onsemi	600	30	300	250	100 @ 150mA, 10V	-55 to 150	Active
PMBT2222,235	NXP USA Inc.	600	30	250	250	100 @ 150mA, 10V	-55 to 150	Active
PMBT4401,215	Nexperia USA Inc.	600	40	250	250	100 @ 150mA, 1V	-55 to 150	Active
SST4401T116	Rohm Semiconductor	600	40	200	250	100 @ 150mA, 1V	-55 to 150	Active

Engineering Selection Recommendations

Category A - Direct Current Rating Equivalents (800 mA):

The 2SD1781KT146Q (Rohm Semiconductor) and BCW65ALT1G (onsemi) maintain the 800 mA collector current specification of the 2SC3265-O-TP. Both parts are active products with ROHS3 compliance and full operating temperature range support (-55°C to 150°C). The 2SD1781KT146Q provides enhanced transition frequency (150 MHz versus 120 MHz) and improved saturation characteristics. The BCW65ALT1G offers increased power dissipation capability (225 mW) and maintains identical DC current gain specifications at the reference condition.

The BSR14 (onsemi) represents an enhanced substitute with 800 mA current capability, 40 V breakdown voltage, and superior frequency performance (300 MHz). This part accommodates applications requiring higher voltage margins and enhanced switching speed.

Category B - Functional Substitutes (600 mA Current Rating):

Parts with 600 mA maximum collector current are suitable for applications where the full 800 mA capability is not required. These substitutes offer active product status and enhanced performance characteristics:

MMBT2222ALT1G (onsemi) provides automotive-grade qualification (AEC-Q101) with 300 MHz transition frequency and 40 V breakdown voltage.
MMBT2222ALT3G (onsemi) offers identical electrical specifications to MMBT2222ALT1G with standard industrial qualification.
MMBT2222LT1G (onsemi) maintains the 30 V breakdown voltage matching the original part while providing 250 MHz transition frequency.
PMBT2222,235 (NXP USA Inc.) is automotive-qualified (AEC-Q101) with 30 V breakdown voltage and 250 MHz transition frequency.
PMBT4401,215 (Nexperia USA Inc.) is automotive-qualified (AEC-Q100) with 40 V breakdown voltage and 250 MHz transition frequency.
SST4401T116 (Rohm Semiconductor) provides 40 V breakdown voltage with 250 MHz transition frequency and 200 mW power rating matching the original specification.

All listed substitutes maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating. Selection between Category A and Category B depends on application current requirements and voltage margin specifications.

Frequently Asked Questions (FAQ)

Q: Can MMBT2222ALT1G replace 2SC3265-O-TP in all applications?

A: MMBT2222ALT1G is a functional substitute when the application current requirement does not exceed 600 mA. The part maintains identical DC current gain (100 minimum), superior voltage rating (40 V versus 30 V), and enhanced frequency performance (300 MHz versus 120 MHz). If the application requires the full 800 mA collector current capability, Category A substitutes (2SD1781KT146Q or BCW65ALT1G) are required.

Q: What is the difference between 2SD1781KT146Q and BCW65ALT1G?

A: Both parts maintain 800 mA collector current and are active products. The 2SD1781KT146Q offers higher transition frequency (150 MHz) and lower saturation voltage (400 mV @ 50 mA, 500 mA). The BCW65ALT1G provides higher power dissipation capability (225 mW) and maintains the original part's saturation voltage specification (500 mV @ 20 mA, 500 mA). Selection depends on specific application requirements for switching speed and power handling.

Q: Are all substitute parts available in the same package as 2SC3265-O-TP?

A: Yes. All listed substitute parts use the TO-236-3, SC-59, SOT-23-3 surface mount package. Supplier device packages may vary (SOT-23, SOT-23-3, SMT3, SST3, TO-236AB), but these represent equivalent physical and electrical package designations suitable for direct PCB footprint compatibility.

Q: Which substitute part offers the best voltage margin above the original 30 V specification?

A: BSR14 provides the highest voltage rating at 40 V breakdown, offering a 10 V margin above the original 2SC3265-O-TP specification. This part also delivers the highest transition frequency (300 MHz) and power dissipation capability (350 mW) among all listed substitutes.

Q: Do any substitute parts have automotive qualification?

A: Yes. MMBT2222ALT1G holds AEC-Q101 automotive qualification. PMBT2222,235 and PMBT4401,215 hold automotive qualifications (AEC-Q101 and AEC-Q100 respectively). These parts are suitable for automotive applications requiring formal qualification documentation.

Q: What is the minimum collector current at which DC current gain is specified?

A: The original 2SC3265-O-TP specifies DC current gain (hFE) at 100 mA collector current. Most Category B substitutes specify hFE at 150 mA collector current. For applications operating at lower collector currents, the original specification point should be verified against individual substitute part datasheets.

Q: Can BSR14 be used as a direct replacement without circuit modification?

A: BSR14 is electrically compatible with 2SC3265-O-TP for applications requiring 800 mA collector current. The higher voltage rating (40 V versus 30 V), enhanced frequency response (300 MHz versus 120 MHz), and increased power capability (350 mW versus 200 mW) make it a superior substitute. No circuit modification is required; however, the enhanced performance characteristics should be verified against application specifications to ensure no adverse effects from increased switching speed.

Q: What is the significance of the different saturation voltage specifications among substitutes?

A: Saturation voltage (Vce sat) affects power dissipation in saturated switching applications. Lower saturation voltage reduces heat generation. The 2SC3265-O-TP specifies 500 mV @ 20 mA, 500 mA. Substitutes vary from 400 mV (2SD1781KT146Q) to 1.6 V (MMBT2222LT1G). For linear amplifier applications, saturation voltage is less critical. For switching applications with high collector current, lower saturation voltage substitutes (2SD1781KT146Q, PMBT4401,215, SST4401T116) reduce power dissipation.

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