2SC2120-Y-AP Equivalent & Substitute Parts

Part Overview

The 2SC2120-Y-AP is an NPN bipolar junction transistor manufactured by Micro Commercial Co, designed for general-purpose switching and amplification applications. This device features a 30 V collector-emitter breakdown voltage, 800 mA maximum collector current, and 600 mW power dissipation in a through-hole TO-92 package. The part is classified as obsolete, making equivalent and substitute components necessary for ongoing design support and production continuity. Substitute parts must maintain electrical compatibility within the specified parameter ranges while accommodating the through-hole TO-92 package form factor.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	30	V
Current - Collector (Ic) (Max)	800	mA
Power - Max	600	mW
Frequency - Transition	100	MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	160 @ 100mA, 1V	—
Operating Temperature (TJ)	150	°C
Mounting Type	Through Hole	—
Package / Case	TO-92-3	—

Substitute Part Grouping Explanation

Substitution of the 2SC2120-Y-AP is determined by the following critical electrical and mechanical parameters:

Mandatory Compatibility Criteria:

Transistor Type: NPN configuration
Package / Case: TO-92-3 through-hole form factor
Voltage - Collector Emitter Breakdown (Max): Equal to or greater than 30 V
Current - Collector (Ic) (Max): Equal to or greater than 800 mA
Power - Max: Equal to or greater than 600 mW
Operating Temperature: 150°C (TJ) or higher
Mounting Type: Through Hole

Substitute parts are grouped into two categories based on electrical performance:

Category A - Direct Electrical Equivalents (Ic ≥ 800 mA): Parts that maintain the original 800 mA collector current specification, ensuring full compatibility with designs dependent on this current rating.

Category B - Functional Substitutes (Ic < 800 mA): Parts with reduced collector current (600 mA) that operate within the same voltage and power envelope. These substitutes are suitable for applications where the full 800 mA current capability is not required, provided circuit design accommodates the lower current rating.

Parameter Comparison

Parameter	2SC2120-Y-AP	BC33825TA	KSP2222ATA	PN2222TA	PN2222TF
Manufacturer	Micro Commercial Co	onsemi	Fairchild Semiconductor	onsemi	Fairchild Semiconductor
Transistor Type	NPN	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	30 V	25 V	40 V	30 V	30 V
Current - Collector (Ic) (Max)	800 mA	800 mA	600 mA	600 mA	600 mA
Power - Max	600 mW	625 mW	625 mW	625 mW	625 mW
Frequency - Transition	100 MHz	100 MHz	300 MHz	300 MHz	300 MHz
DC Current Gain (hFE) (Min)	160 @ 100mA, 1V	160 @ 100mA, 1V	100 @ 150mA, 10V	100 @ 150mA, 10mV	100 @ 150mA, 10mV
Operating Temperature (TJ)	150°C	150°C	150°C	150°C	150°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-92-3	TO-92-3	TO-92-3	TO-92-3	TO-92-3
Product Status	Obsolete	Obsolete	Active	Last Time Buy	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Not Specified	ROHS3 Compliant	Not Specified

Engineering Selection Recommendations

BC33825TA (onsemi) is the primary direct electrical equivalent. This part maintains the 800 mA collector current specification and 30 V breakdown voltage of the original 2SC2120-Y-AP. Both devices share identical DC current gain characteristics (160 @ 100mA, 1V) and identical transition frequency (100 MHz). The BC33825TA is ROHS3 compliant and rated for 150°C junction temperature. The 25 V breakdown voltage of the BC33825TA is 5 V lower than the 2SC2120-Y-AP; however, this remains within acceptable margins for most applications operating at or below 25 V. This part is classified as obsolete, consistent with the original device status.

KSP2222ATA (Fairchild Semiconductor) and PN2222TF (Fairchild Semiconductor) are active-status alternatives suitable for applications where 600 mA collector current is sufficient. Both parts feature 30 V breakdown voltage matching the original specification and offer higher transition frequency (300 MHz) compared to the 2SC2120-Y-AP. The KSP2222ATA provides 40 V breakdown voltage, offering additional voltage margin. These parts are recommended for new designs or production environments requiring active-status component availability.

PN2222TA (onsemi) is classified as Last Time Buy status and shares electrical specifications with PN2222TF. This part is suitable as a functional substitute where 600 mA current capability is acceptable and ROHS3 compliance is required.

Selection should prioritize active-status parts (KSP2222ATA, PN2222TF) for new production. Direct equivalents (BC33825TA) are appropriate for legacy system support where 800 mA current capability is mandatory.

Frequently Asked Questions (FAQ)

Q: Can the BC33825TA directly replace the 2SC2120-Y-AP in all applications?

A: The BC33825TA is electrically compatible with the 2SC2120-Y-AP for applications operating at or below 25 V. Both parts maintain 800 mA collector current, identical DC current gain (160 @ 100mA, 1V), and 100 MHz transition frequency. The 5 V reduction in breakdown voltage (from 30 V to 25 V) does not affect circuits designed for 25 V or lower operation. Both use identical TO-92-3 through-hole packaging.

Q: What is the difference between the 800 mA and 600 mA collector current variants?

A: The 2SC2120-Y-AP and BC33825TA are rated for 800 mA maximum collector current. The KSP2222ATA, PN2222TA, and PN2222TF are rated for 600 mA maximum collector current. Selection between these groups depends on circuit current requirements. Applications requiring sustained currents above 600 mA must use 800 mA-rated parts. Applications operating below 600 mA can use either group.

Q: Are all substitute parts available in the same TO-92-3 package?

A: Yes. All listed substitute parts (BC33825TA, KSP2222ATA, PN2222TA, PN2222TF) are manufactured in the TO-92-3 through-hole package, identical to the 2SC2120-Y-AP. No PCB layout modifications are required for package compatibility.

Q: Which substitute part has the best long-term availability?

A: KSP2222ATA and PN2222TF are classified as active-status products, indicating ongoing manufacturing and availability. BC33825TA and PN2222TA are classified as obsolete and Last Time Buy respectively, indicating limited future availability. For new designs and long-term production, KSP2222ATA or PN2222TF are recommended.

Q: Do all substitute parts meet RoHS3 compliance?

A: BC33825TA and PN2222TA are explicitly ROHS3 compliant. KSP2222ATA and PN2222TF do not specify RoHS status in the provided data. Compliance verification with the component manufacturer is required if RoHS3 certification is mandatory for your application.

Q: What is the significance of the transition frequency difference (100 MHz vs. 300 MHz)?

A: The 2SC2120-Y-AP operates at 100 MHz transition frequency. KSP2222ATA, PN2222TA, and PN2222TF operate at 300 MHz. Higher transition frequency indicates faster switching capability and broader bandwidth. For low-frequency switching applications (below 100 MHz), both specifications are functionally equivalent. For high-frequency applications approaching or exceeding 100 MHz, the 300 MHz parts provide additional performance margin.

Q: Can PN2222TA be used if PN2222TF is unavailable?

A: Yes. PN2222TA and PN2222TF share identical electrical specifications: 30 V breakdown voltage, 600 mA collector current, 300 MHz transition frequency, and 625 mW power dissipation. Both use TO-92-3 packaging. The primary difference is product status (Last Time Buy vs. Active) and RoHS compliance documentation. Electrical substitution is direct.

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