FJC790TF Equivalent & Substitute Parts

Part Overview

The FJC790TF is a PNP bipolar junction transistor manufactured by onsemi, rated for 40 V collector-emitter breakdown voltage and 2 A maximum collector current in a surface mount SOT-89-3 package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The FJC790TF delivers 500 mW maximum power dissipation with a minimum DC current gain of 300 at 10 mA collector current and 2 V collector-emitter voltage.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) (Max)	2	A
Voltage - Collector Emitter Breakdown (Max)	40	V
Vce Saturation (Max) @ Ib, Ic	450 mV @ 50 mA, 2 A	—
Current - Collector Cutoff (Max)	100	nA
DC Current Gain (hFE) (Min) @ Ic, Vce	300 @ 10 mA, 2 V	—
Power - Max	500	mW
Operating Temperature (TJ)	150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-243AA	—
Supplier Device Package	SOT-89-3	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the FJC790TF are classified based on electrical parameter compatibility within the allowed operating ranges. The primary substitution criteria are:

Direct Electrical Compatibility (Tier 1): Parts maintaining identical or superior ratings across all critical parameters: 40 V collector-emitter breakdown voltage, 2 A minimum collector current capability, 300 minimum DC current gain at specified conditions, and SOT-89-3 package configuration.

Functional Compatibility with Parameter Derating (Tier 2): Parts with reduced voltage or current ratings that remain suitable for applications operating below the FJC790TF maximum specifications, provided all other electrical characteristics remain compatible.

Key Parameters for Substitution Assessment:

Transistor type (PNP)
Collector-emitter breakdown voltage (40 V or higher)
Maximum collector current (2 A or higher)
DC current gain (hFE minimum 300 or higher at comparable conditions)
Package type (SOT-89-3 or TO-243AA equivalent)
Surface mount configuration
Operating temperature range (150°C maximum junction temperature)

Parameter Comparison

Parameter	FJC790TF (onsemi)	FCX790ATA (Diodes Inc.)	2SAR512P5T100 (Rohm)	2SAR542PT100 (Rohm)	ZXTP25040DZTA (Diodes Inc.)
Transistor Type	PNP	PNP	PNP	PNP	PNP
Current - Collector (Ic) (Max)	2 A	2 A	2 A	5 A	3 A
Voltage - Collector Emitter Breakdown (Max)	40 V	40 V	30 V	30 V	40 V
Vce Saturation (Max) @ Ib, Ic	450 mV @ 50 mA, 2 A	450 mV @ 50 mA, 2 A	400 mV @ 35 mA, 700 mA	400 mV @ 100 mA, 5 A	350 mV @ 350 mA, 3.5 A
Current - Collector Cutoff (Max)	100 nA	100 nA	1 µA	1 µA	50 nA
DC Current Gain (hFE) (Min) @ Ic, Vce	300 @ 10 mA, 2 V	300 @ 10 mA, 2 V	200 @ 100 mA, 2 V	200 @ 500 mA, 2 V	300 @ 10 mA, 2 V
Power - Max	500 mW	2 W	500 mW	2 W	2.4 W
Operating Temperature (TJ)	150°C	-55°C ~ 150°C	150°C	150°C	-55°C ~ 150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-243AA	TO-243AA	TO-243AA	TO-243AA	TO-243AA
Supplier Device Package	SOT-89-3	SOT-89-3	MPT3	MPT3	SOT-89-3
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

FCX790ATA (Diodes Incorporated) is the primary direct substitute for the FJC790TF. This part maintains identical electrical specifications across all critical parameters: 40 V collector-emitter breakdown voltage, 2 A maximum collector current, 300 minimum DC current gain at 10 mA and 2 V, and 450 mV saturation voltage at rated conditions. The FCX790ATA is packaged in SOT-89-3 configuration and is ROHS3 compliant with active product status, ensuring long-term availability and supply chain continuity. The extended operating temperature range (-55°C to 150°C) provides additional thermal margin compared to the FJC790TF specification.

ZXTP25040DZTA (Diodes Incorporated) is a compatible substitute with enhanced current handling capability. This device maintains the 40 V collector-emitter breakdown voltage and 300 minimum DC current gain at 10 mA and 2 V, but provides 3 A maximum collector current and 2.4 W power dissipation. The ZXTP25040DZTA is suitable for applications requiring higher current capacity within the same voltage class and is ROHS3 compliant with active product status.

2SAR512P5T100 (Rohm Semiconductor) and 2SAR542PT100 (Rohm Semiconductor) are functional substitutes with reduced voltage ratings. Both parts operate at 30 V collector-emitter breakdown voltage, which is 10 V below the FJC790TF specification. These parts are suitable only for applications operating at or below 30 V. The 2SAR512P5T100 maintains 2 A collector current with 500 mW power dissipation, while the 2SAR542PT100 provides 5 A collector current and 2 W power dissipation. Both are ROHS3 compliant with active product status.

All substitute parts maintain TO-243AA package equivalence and surface mount configuration compatibility. Selection should be based on application voltage requirements, current demands, and thermal dissipation needs.

Frequently Asked Questions (FAQ)

Q: Can the FCX790ATA directly replace the FJC790TF without circuit modification?

A: Yes. The FCX790ATA maintains identical electrical specifications for collector-emitter breakdown voltage (40 V), maximum collector current (2 A), DC current gain (300 minimum at 10 mA, 2 V), and saturation voltage (450 mV at 50 mA, 2 A). Both devices use SOT-89-3 packaging with TO-243AA case configuration, enabling direct pin-compatible substitution.

Q: What is the key difference between the FCX790ATA and ZXTP25040DZTA?

A: Both parts maintain 40 V collector-emitter breakdown voltage and 300 minimum DC current gain. The primary difference is maximum collector current: FCX790ATA is rated for 2 A, while ZXTP25040DZTA is rated for 3 A. The ZXTP25040DZTA also provides higher power dissipation (2.4 W versus 2 W). Selection depends on application current requirements.

Q: Why are the 2SAR512P5T100 and 2SAR542PT100 listed as substitutes if they have lower voltage ratings?

A: These parts are classified as functional substitutes for applications operating at or below 30 V collector-emitter voltage. While they do not match the FJC790TF 40 V specification, they provide equivalent or superior current handling and are suitable for designs with reduced voltage requirements. They are not suitable for applications requiring the full 40 V rating.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (FCX790ATA, ZXTP25040DZTA, 2SAR512P5T100, and 2SAR542PT100) are ROHS3 compliant. The original FJC790TF does not specify RoHS status due to its obsolete classification.

Q: What is the difference between SOT-89-3 and MPT3 packaging?

A: Both SOT-89-3 and MPT3 are surface mount packages with TO-243AA case equivalence. The FCX790ATA and ZXTP25040DZTA use SOT-89-3 designation, while the Rohm parts (2SAR512P5T100 and 2SAR542PT100) use MPT3 designation. Both package types are mechanically and electrically compatible for the FJC790TF application.

Q: Can I use the 2SAR542PT100 in a circuit designed for the FJC790TF?

A: The 2SAR542PT100 can be used only if the application operates at or below 30 V collector-emitter voltage. The part provides superior current handling (5 A versus 2 A) and power dissipation (2 W versus 500 mW), but the reduced voltage rating makes it unsuitable for circuits requiring the full 40 V specification of the FJC790TF.

Q: What is the operating temperature range for each substitute?

A: The FCX790ATA and ZXTP25040DZTA both specify -55°C to 150°C junction temperature range. The 2SAR512P5T100 and 2SAR542PT100 specify 150°C maximum junction temperature. All parts meet or exceed the FJC790TF 150°C maximum specification.

Q: Are there inventory considerations for selecting a substitute?

A: Yes. The FCX790ATA has 25,611 pieces in stock, ZXTP25040DZTA has 25,100 pieces, 2SAR512P5T100 has 680,300 pieces, and 2SAR542PT100 has 114,300 pieces. All substitutes have substantial inventory availability, supporting production continuity for the obsolete FJC790TF.

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