Equivalent & Substitute Parts for 12A02CH-TL-E

Part Overview

The 12A02CH-TL-E is a PNP bipolar junction transistor manufactured by onsemi, rated for 12 V collector-emitter breakdown voltage and 1 A maximum collector current. This device is designed for surface mount applications in the SC-96 package and operates at frequencies up to 450 MHz with a maximum power dissipation of 700 mW. The part is classified as obsolete, making equivalent and substitute components necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	12	V
Current - Collector (Ic) (Max)	1	A
Power - Max	700	mW
Frequency - Transition	450	MHz
Vce Saturation (Max) @ Ib, Ic	240 mV @ 20 mA, 400 mA	—
DC Current Gain (hFE) (Min) @ Ic, Vce	300 @ 10 mA, 2 V	—
Operating Temperature (TJ)	150	°C
Mounting Type	Surface Mount	—
Package / Case	SC-96	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the 12A02CH-TL-E is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor Type: PNP (mandatory match)
Voltage - Collector Emitter Breakdown (Max): 12 V or higher
Current - Collector (Ic) (Max): 1 A or higher
Mounting Type: Surface Mount
Operating Temperature: 150°C or higher
RoHS Status: ROHS3 Compliant

Secondary Compatibility Factors:

Power dissipation capability
Frequency response characteristics
Vce saturation voltage
DC current gain (hFE)
Package compatibility for board layout

Substitute parts are grouped into two categories based on package type compatibility:

Category A - SC-96 Package (Direct Mechanical Replacement): Parts maintaining the original SC-96 package footprint for direct PCB substitution without layout modification.

Category B - SMT3/SOT-23-3 Package (Functional Equivalents): Parts with equivalent electrical performance but different surface mount packages (TO-236-3, SC-59, SOT-23-3), requiring PCB layout adjustment.

Parameter Comparison

Parameter	12A02CH-TL-E	2SB1705TL	FMMTL717TA	2SB1690KT146	2SB1590KT146Q	2SA2119KT146
Manufacturer	onsemi	Rohm Semiconductor	Diodes Incorporated	Rohm Semiconductor	Rohm Semiconductor	Rohm Semiconductor
Transistor Type	PNP	PNP	PNP	PNP	PNP	PNP
Voltage - Collector Emitter Breakdown (Max)	12 V	12 V	12 V	12 V	15 V	12 V
Current - Collector (Ic) (Max)	1 A	3 A	1.25 A	2 A	1 A	500 mA
Power - Max	700 mW	500 mW	500 mW	200 mW	200 mW	200 mW
Frequency - Transition	450 MHz	280 MHz	205 MHz	360 MHz	200 MHz	260 MHz
Vce Saturation (Max) @ Ib, Ic	240 mV @ 20 mA, 400 mA	250 mV @ 30 mA, 1.5 A	290 mV @ 50 mA, 1.25 A	180 mV @ 50 mA, 1 A	300 mV @ 20 mA, 400 mA	250 mV @ 10 mA, 200 mA
DC Current Gain (hFE) (Min) @ Ic, Vce	300 @ 10 mA, 2 V	270 @ 500 mA, 2 V	300 @ 100 mA, 2 V	270 @ 200 mA, 2 V	120 @ 500 mA, 2 V	270 @ 10 mA, 2 V
Operating Temperature (TJ)	150°C	150°C	-55°C ~ 150°C	150°C	150°C	150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	SC-96	SC-96	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	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Mechanical Replacement (SC-96 Package):

The 2SB1705TL from Rohm Semiconductor is the primary substitute for direct PCB replacement without layout modification. This part maintains the SC-96 package footprint identical to the 12A02CH-TL-E. The 2SB1705TL exceeds the original specifications with 3 A maximum collector current (versus 1 A), 12 V breakdown voltage match, and 500 mW power dissipation. The transition frequency of 280 MHz is lower than the original 450 MHz but remains suitable for most applications. The part is active in production status with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1).

Functional Equivalents (SMT3/SOT-23-3 Packages):

For applications where PCB layout modification is acceptable, three active alternatives provide functional equivalence with different performance characteristics:

FMMTL717TA (Diodes Incorporated): Offers the closest electrical match with 1.25 A collector current, 12 V breakdown voltage, and 500 mW power dissipation. DC current gain of 300 @ 100 mA matches the original specification. Operating temperature range extends to -55°C, providing broader thermal coverage. Transition frequency of 205 MHz is lower than the original. This part has the highest inventory availability (56,100 pcs).

2SB1690KT146 (Rohm Semiconductor): Provides 2 A collector current capability with 12 V breakdown voltage and 360 MHz transition frequency, approaching the original frequency performance. Vce saturation of 180 mV @ 50 mA, 1 A represents superior saturation characteristics. Power dissipation is limited to 200 mW, which may constrain applications requiring the full 700 mW capability of the original part.

2SB1590KT146Q (Rohm Semiconductor): Rated for 15 V breakdown voltage, providing voltage margin above the 12 V specification. Maintains 1 A collector current matching the original. Power dissipation is limited to 200 mW. DC current gain of 120 @ 500 mA is significantly lower than the original 300 @ 10 mA, affecting circuit biasing requirements.

2SA2119KT146 (Rohm Semiconductor): Rated for 500 mA maximum collector current, which is below the original 1 A specification. This part is suitable only for applications with reduced current requirements. Power dissipation of 200 mW and transition frequency of 260 MHz are lower than the original.

All substitute parts are ROHS3 compliant, REACH unaffected, and classified as active products with established supply chains.

Frequently Asked Questions (FAQ)

Q: Can the 2SB1705TL directly replace the 12A02CH-TL-E without PCB modification?

A: Yes. The 2SB1705TL maintains the SC-96 package footprint identical to the 12A02CH-TL-E, enabling direct PCB substitution without layout changes. Both parts are surface mount devices with the same package dimensions and pin configuration.

Q: What is the primary limitation when substituting with SMT3/SOT-23-3 package alternatives?

A: The SMT3 and SOT-23-3 packages (FMMTL717TA, 2SB1690KT146, 2SB1590KT146Q, 2SA2119KT146) have different footprints than the original SC-96 package. PCB layout modification is required to accommodate the alternative package geometry. Pin-to-pin electrical compatibility exists, but physical placement differs.

Q: Which substitute part has the highest collector current rating?

A: The 2SB1705TL is rated for 3 A maximum collector current, exceeding the original 1 A specification. This provides design margin for applications requiring higher current handling.

Q: Is the reduced transition frequency of substitute parts a concern?

A: The original 12A02CH-TL-E operates at 450 MHz transition frequency. Substitute parts range from 200 MHz to 360 MHz. For applications operating below these frequencies, the reduced transition frequency does not impact performance. Applications requiring operation near or above 450 MHz may experience performance degradation with lower-frequency substitutes.

Q: Which substitute part offers the broadest operating temperature range?

A: The FMMTL717TA from Diodes Incorporated specifies an operating temperature range of -55°C to 150°C, compared to 150°C maximum for other substitutes. This extended lower temperature limit provides thermal coverage for cold environment applications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed (2SB1705TL, FMMTL717TA, 2SB1690KT146, 2SB1590KT146Q, 2SA2119KT146) are ROHS3 compliant and REACH unaffected, matching the environmental compliance status of the original 12A02CH-TL-E.

Q: What is the impact of lower power dissipation ratings in substitute parts?

A: The original 12A02CH-TL-E is rated for 700 mW maximum power dissipation. Most substitute parts (2SB1690KT146, 2SB1590KT146Q, 2SA2119KT146) are limited to 200 mW, while 2SB1705TL and FMMTL717TA are rated for 500 mW. Applications requiring continuous operation at or near 700 mW power dissipation must verify that substitute parts can accommodate the thermal load through circuit design adjustments or thermal management enhancements.

Q: Can the 2SA2119KT146 be used as a direct substitute?

A: The 2SA2119KT146 is electrically compatible as a PNP transistor with 12 V breakdown voltage and ROHS3 compliance. However, the 500 mA maximum collector current is below the original 1 A specification. This part is suitable only for applications with collector current requirements not exceeding 500 mA.

Q: What is the significance of Vce saturation voltage differences between parts?

A: Vce saturation voltage affects the voltage drop across the transistor in saturation mode, influencing circuit efficiency and heat dissipation. The 2SB1690KT146 exhibits the lowest saturation voltage (180 mV @ 50 mA, 1 A), while the 2SB1590KT146Q exhibits the highest (300 mV @ 20 mA, 400 mA). For switching applications, lower saturation voltage reduces power loss.

Q: Are all substitute parts available in active production status?

A: Yes. All substitute parts (2SB1705TL, FMMTL717TA, 2SB1690KT146, 2SB1590KT146Q, 2SA2119KT146) are classified as active products. The original 12A02CH-TL-E is obsolete, making these active alternatives necessary for ongoing procurement and design support.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message