2SC2120-O-AP Equivalent & Substitute Parts

Part Overview

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

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) (Max)	800	mA
Voltage - Collector Emitter Breakdown (Max)	30	V
Vce Saturation (Max) @ Ib, Ic	500 mV @ 20 mA, 500 mA	—
Current - Collector Cutoff (Max)	100	nA
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 100 mA, 1 V	—
Power - Max	600	mW
Frequency - Transition	100	MHz
Operating Temperature (TJ)	150	°C
Mounting Type	Through Hole	—
Package / Case	TO-226-3, TO-92-3 (TO-226AA) Formed Leads	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the 2SC2120-O-AP is determined by electrical parameter compatibility within the following criteria:

Mandatory Compatibility Parameters:

Transistor Type: NPN configuration required
Mounting Type: Through Hole required
Package / Case: TO-92-3 (TO-226AA) Formed Leads required
Operating Temperature: 150°C (TJ) minimum required
RoHS Status: ROHS3 Compliant required

Electrical Performance Parameters:

Collector-Emitter Breakdown Voltage (Vceo): Must equal or exceed 30 V
Maximum Collector Current (Ic): Must equal or exceed 800 mA
Maximum Power Dissipation: Must equal or exceed 600 mW
DC Current Gain (hFE): Must meet or exceed 100 at specified conditions
Transition Frequency: Performance enhancement acceptable

Substitute parts KSP2222ATA, PN2222TA, and PN2222TF meet the mandatory package and compliance requirements. However, electrical parameter deviations exist and must be evaluated for specific application requirements.

Parameter Comparison

Parameter	2SC2120-O-AP	KSP2222ATA	PN2222TA	PN2222TF
Transistor Type	NPN	NPN	NPN	NPN
Current - Collector (Ic) (Max)	800 mA	600 mA	600 mA	600 mA
Voltage - Collector Emitter Breakdown (Max)	30 V	40 V	30 V	30 V
Vce Saturation (Max) @ Ib, Ic	500 mV @ 20 mA, 500 mA	1 V @ 50 mA, 500 mA	1 V @ 50 mA, 500 mA	1 V @ 50 mA, 500 mA
Current - Collector Cutoff (Max)	100 nA	10 nA	10 nA	10 nA
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 100 mA, 1 V	100 @ 150 mA, 10 V	100 @ 150 mA, 10 mV	100 @ 150 mA, 10 mV
Power - Max	600 mW	625 mW	625 mW	625 mW
Frequency - Transition	100 MHz	300 MHz	300 MHz	300 MHz
Operating Temperature (TJ)	150°C	150°C	150°C	150°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3
Product Status	Obsolete	Active	Last Time Buy	Active
RoHS Status	ROHS3 Compliant	Not specified	ROHS3 Compliant	Not specified

Engineering Selection Recommendations

KSP2222ATA (Fairchild Semiconductor)

KSP2222ATA is an active product with current manufacturing status and full inventory availability (55,200 pcs). This device provides enhanced electrical performance with 40 V collector-emitter breakdown voltage and 625 mW maximum power dissipation. The primary limitation is reduced maximum collector current (600 mA versus 800 mA). Applications requiring the full 800 mA collector current capability of the 2SC2120-O-AP cannot use KSP2222ATA as a direct substitute. RoHS compliance status is not specified in available documentation.

PN2222TA (onsemi)

PN2222TA is classified as Last Time Buy, indicating limited future availability. This device matches the 2SC2120-O-AP collector-emitter breakdown voltage (30 V) and provides equivalent power dissipation (625 mW). Maximum collector current is reduced to 600 mA. PN2222TA is ROHS3 compliant and carries MSL rating of Not Applicable. The Last Time Buy status requires evaluation of long-term supply chain requirements.

PN2222TF (Fairchild Semiconductor)

PN2222TF is an active product with the highest inventory availability (64,868 pcs) among substitute options. Electrical specifications match PN2222TA with 30 V collector-emitter breakdown voltage and 625 mW maximum power dissipation. Maximum collector current is 600 mA. RoHS compliance status is not specified. The active product status and superior inventory position support long-term design continuity.

Selection Criteria Summary

For applications operating at or below 600 mA collector current, PN2222TF is the preferred substitute based on active product status and maximum inventory availability. KSP2222ATA provides enhanced voltage rating (40 V) for applications requiring higher collector-emitter breakdown voltage margins. PN2222TA is suitable only when specific design requirements align with its Last Time Buy status and onsemi sourcing preferences.

Frequently Asked Questions (FAQ)

Q: Can KSP2222ATA directly replace 2SC2120-O-AP in all applications?

A: KSP2222ATA is electrically compatible for applications operating at collector currents of 600 mA or below. Applications requiring the full 800 mA maximum collector current capability of the 2SC2120-O-AP cannot use KSP2222ATA. The enhanced 40 V collector-emitter breakdown voltage provides additional design margin compared to the 30 V rating of the original device.

Q: What is the primary electrical difference between the substitute parts?

A: The maximum collector current is the primary electrical difference. The 2SC2120-O-AP supports 800 mA, while KSP2222ATA, PN2222TA, and PN2222TF are rated for 600 mA maximum. All substitute parts provide equal or superior power dissipation (625 mW versus 600 mW) and transition frequency performance (300 MHz versus 100 MHz).

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

A: Yes. All substitute parts use the TO-226-3, TO-92-3 (TO-226AA) Formed Leads package, ensuring mechanical and pin compatibility with the 2SC2120-O-AP. Through-hole mounting characteristics are identical across all devices.

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

A: PN2222TF (Fairchild Semiconductor) is the recommended choice for long-term availability, with active product status and 64,868 pcs in current inventory. PN2222TA carries Last Time Buy status, indicating limited future availability. KSP2222ATA is active but with lower inventory levels (55,200 pcs).

Q: Do all substitute parts meet RoHS3 compliance?

A: PN2222TA is explicitly ROHS3 compliant. RoHS compliance status for KSP2222ATA and PN2222TF is not specified in available technical documentation. Compliance verification with component suppliers is required for applications with mandatory RoHS requirements.

Q: What is the impact of reduced maximum collector current on circuit design?

A: Applications designed for 800 mA operation require circuit redesign or alternative component selection. Applications operating at 600 mA or below require no circuit modification. Thermal management and current distribution calculations must be re-evaluated for the substitute device specifications.

Q: Are the saturation voltage characteristics equivalent?

A: Saturation voltage differs between the original and substitute parts. The 2SC2120-O-AP specifies 500 mV maximum at 20 mA base current and 500 mA collector current. All substitute parts specify 1 V maximum at 50 mA base current and 500 mA collector current. Applications sensitive to saturation voltage performance require detailed circuit analysis.

Q: Can PN2222TA be used despite Last Time Buy status?

A: PN2222TA is electrically suitable for applications operating at 600 mA or below with 30 V collector-emitter breakdown voltage requirements. The Last Time Buy status indicates onsemi will discontinue production after a specified date. Current inventory (4,556 pcs) supports near-term production requirements. Long-term design strategies should prioritize PN2222TF or KSP2222ATA for sustained availability.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message