2SA1298-O-AP Equivalent & Substitute Parts

Part Overview

The 2SA1298-O-AP is a PNP 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, collector-emitter breakdown voltage of 30 V, and maximum power dissipation of 200 mW. The device is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing design requirements and production continuity. Active alternatives with compatible electrical and mechanical specifications are available from multiple manufacturers.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) (Max)	800	mA
Voltage - Collector Emitter Breakdown (Max)	30	V
Vce Saturation (Max) @ Ib, Ic	400mV @ 20mA, 500mA	—
Current - Collector Cutoff (Max)	100	nA
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 100mA, 1V	—
Power - Max	200	mW
Frequency - Transition	250	MHz
Operating Temperature	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the 2SA1298-O-AP is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Transistor Type: PNP configuration
Collector Current (Ic) (Max): 800 mA minimum
Collector-Emitter Breakdown Voltage (Vce(br)ceo): 25 V or greater
Power Dissipation (Max): 200 mW or greater
Mounting Type: Surface Mount
Package: SOT-23 or equivalent footprint (TO-236-3, SC-59, SOT-23-3)
RoHS Compliance: ROHS3 Compliant

Secondary Compatibility Parameters:

DC Current Gain (hFE): Minimum 100 at specified conditions
Saturation Voltage (Vce(sat)): Consistent with switching applications
Transition Frequency: 120 MHz or greater
Operating Temperature Range: Support for -55°C to 150°C or subset thereof

The substitute parts listed below meet all mandatory criteria and maintain electrical performance within acceptable ranges for direct replacement in existing designs.

Parameter Comparison

Parameter	2SA1298-O-AP (Main)	2SA1298-Y,LF	2SB1197KT146Q	2SB1197KT146R	PMBT2907,215
Manufacturer	Micro Commercial Co	Toshiba Semiconductor and Storage	Rohm Semiconductor	Rohm Semiconductor	NXP USA Inc.
Transistor Type	PNP	PNP	PNP	PNP	PNP
Current - Collector (Ic) (Max)	800 mA	800 mA	800 mA	800 mA	600 mA
Voltage - Collector Emitter Breakdown (Max)	30 V	25 V	32 V	32 V	40 V
Vce Saturation (Max) @ Ib, Ic	400mV @ 20mA, 500mA	400mV @ 20mA, 500mA	500mV @ 50mA, 500mA	500mV @ 50mA, 500mA	1.6V @ 50mA, 500mA
Current - Collector Cutoff (Max)	100 nA	100 nA	500 nA	500 nA	20 nA
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 100mA, 1V	160 @ 100mA, 1V	120 @ 100mA, 3V	180 @ 100mA, 3V	100 @ 150mA, 10V
Power - Max	200 mW	200 mW	200 mW	200 mW	250 mW
Frequency - Transition	250 MHz	120 MHz	200 MHz	200 MHz	200 MHz
Operating Temperature (Max)	150°C	150°C	150°C	150°C	150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	Not specified

Engineering Selection Recommendations

2SA1298-Y,LF (Toshiba Semiconductor and Storage)

This substitute is an active product with ROHS3 compliance and MSL 1 rating. It maintains 800 mA collector current and 200 mW power dissipation identical to the main part. The collector-emitter breakdown voltage is 25 V, which is 5 V lower than the 2SA1298-O-AP. This part is suitable for applications where the 30 V rating is not a critical design requirement. The transition frequency of 120 MHz is lower than the main part's 250 MHz. Inventory availability is substantial at 3721 pieces.

2SB1197KT146Q (Rohm Semiconductor)

This active substitute provides 32 V collector-emitter breakdown voltage, exceeding the main part specification. Collector current and power dissipation match at 800 mA and 200 mW respectively. The transition frequency is 200 MHz. DC current gain is 120 at 100 mA and 3 V. ROHS3 compliance and MSL 1 rating are confirmed. Inventory is high at 79802 pieces. This part is suitable for designs requiring voltage margin above 30 V.

2SB1197KT146R (Rohm Semiconductor)

This active substitute is functionally equivalent to the 2SB1197KT146Q with identical electrical specifications: 32 V breakdown voltage, 800 mA collector current, 200 mW power dissipation, and 200 MHz transition frequency. The DC current gain is higher at 180 at 100 mA and 3 V. ROHS3 compliance and MSL 1 rating are confirmed. Inventory availability is 102400 pieces. This variant offers improved current gain performance.

PMBT2907,215 (NXP USA Inc.)

This active substitute provides 40 V collector-emitter breakdown voltage, offering the highest voltage margin among all substitutes. However, the maximum collector current is 600 mA, which is 200 mA lower than the main part. Power dissipation is 250 mW, exceeding the main part specification. Transition frequency is 200 MHz. This part is suitable for applications where collector current does not exceed 600 mA and higher voltage rating is beneficial. Inventory is 354034 pieces. Automotive qualification (AEC-Q101) is available.

Frequently Asked Questions (FAQ)

Q: Can the 2SA1298-Y,LF directly replace the 2SA1298-O-AP in all applications?

A: The 2SA1298-Y,LF is compatible for applications where the collector-emitter breakdown voltage of 25 V is sufficient. If the design requires the full 30 V rating, this substitute is not appropriate. The lower transition frequency of 120 MHz versus 250 MHz may affect high-frequency performance. Electrical compatibility is otherwise maintained at 800 mA collector current and 200 mW power dissipation.

Q: What is the primary difference between 2SB1197KT146Q and 2SB1197KT146R?

A: Both parts are functionally equivalent with identical electrical specifications. The primary difference is the DC current gain: 2SB1197KT146Q provides 120 minimum at 100 mA and 3 V, while 2SB1197KT146R provides 180 minimum at the same conditions. Selection depends on whether higher current gain is required for the application.

Q: Is the PMBT2907,215 suitable as a substitute if the application requires 800 mA collector current?

A: No. The PMBT2907,215 has a maximum collector current rating of 600 mA, which is 200 mA below the 2SA1298-O-AP specification. This part is suitable only for applications where collector current does not exceed 600 mA. Using this part in an 800 mA application would exceed its maximum ratings.

Q: Are all substitute parts available in the same SOT-23 package?

A: Yes. All substitute parts listed are available in the TO-236-3, SC-59, SOT-23-3 package family, ensuring mechanical and footprint compatibility with the original 2SA1298-O-AP design.

Q: What is the significance of the RoHS3 compliance status?

A: ROHS3 compliance indicates that the part meets Restriction of Hazardous Substances Directive requirements, restricting the use of specific hazardous materials. All listed substitutes maintain ROHS3 compliance, ensuring regulatory compatibility with the original part for applications subject to these requirements.

Q: Why is the 2SA1298-O-AP classified as obsolete?

A: The 2SA1298-O-AP is marked as obsolete by the manufacturer, indicating that production has been discontinued. Active substitutes with equivalent or superior electrical specifications are available from multiple manufacturers, providing design continuity and supply chain reliability.

Q: Can saturation voltage differences affect circuit performance?

A: Yes. Saturation voltage differences between parts can affect switching speed and power dissipation in switching applications. The 2SA1298-O-AP specifies 400 mV at 20 mA and 500 mA, while substitutes specify 400 mV to 1.6 V depending on the part. Circuit designs sensitive to saturation voltage must account for these variations.

Q: What does MSL 1 (Unlimited) mean for moisture sensitivity?

A: MSL 1 indicates the lowest moisture sensitivity level, meaning the component can be stored indefinitely without special moisture control measures. All listed substitutes maintain MSL 1 rating, ensuring equivalent handling and storage requirements.

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