2SA1774T1 PNP Bipolar Junction Transistor Equivalent & Substitute Parts

Part Overview

The 2SA1774T1 is an obsolete PNP bipolar junction transistor manufactured by onsemi, rated for 50 V collector-emitter breakdown voltage and 100 mA maximum collector current. The device is packaged in SC-75 (SOT-416) surface mount configuration with 150 mW power dissipation capability and 140 MHz transition frequency. Due to its obsolete product status, equivalent and substitute parts are necessary for ongoing production and design continuity. Active alternatives with identical or enhanced electrical characteristics are available from onsemi and other manufacturers.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Collector Current (Max)	100	mA
Collector-Emitter Breakdown Voltage (Max)	50	V
Vce Saturation (Max)	500	mV @ 5mA, 50mA
DC Current Gain (hFE Min)	120	@ 1mA, 6V
Power Dissipation (Max)	150	mW
Transition Frequency	140	MHz
Mounting Type	Surface Mount	—
Package	SC-75, SOT-416	—
Operating Temperature (Max)	150	°C

Substitute Part Grouping Explanation

Substitution of the 2SA1774T1 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Parameters for Direct Substitution:

Transistor type: PNP
Collector-emitter breakdown voltage: 50 V (minimum requirement)
Collector current rating: 100 mA or greater
Vce saturation: 500 mV @ 5mA, 50mA
DC current gain (hFE): 120 or greater @ 1mA, 6V
Power dissipation: 150 mW or greater
Transition frequency: 140 MHz or greater
Mounting type: Surface mount
Package compatibility: SC-75 (SOT-416) or equivalent footprint

Substitute Categories:

Direct Manufacturer Equivalent: Parts with identical electrical specifications and same base product number (2SA1774) from onsemi, differing only in packaging format (Tape & Reel vs. bulk).

Parametric Equivalent: Parts with identical electrical specifications and compatible package footprint, including alternative manufacturer variants with enhanced compliance status.

Similar Substitute: Parts with enhanced collector current rating (150 mA vs. 100 mA) or alternative package configurations (SOT-523, EMT3) that maintain all critical electrical parameters and are pin-compatible or functionally equivalent.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce(br) V	hFE (Min)	Package	Product Status	RoHS Compliance
2SA1774T1	onsemi	100	50	120	SC-75, SOT-416	Obsolete	Non-compliant
2SA1774T1G	onsemi	100	50	120	SC-75, SOT-416	Active	ROHS3 Compliant
S2SA1774G	onsemi	100	50	120	SC-75, SOT-416	Active	ROHS3 Compliant
2DA1774Q-7-F	Diodes Incorporated	150	50	120	SOT-523	Active	ROHS3 Compliant
2DA1774R-7-F	Diodes Incorporated	150	50	180	SOT-523	Active	ROHS3 Compliant
2SA1774TLQ	Rohm Semiconductor	150	50	120	EMT3	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications and Package):

The 2SA1774T1G is the primary recommended substitute. This part is manufactured by onsemi under the same base product number (2SA1774) with identical electrical specifications to the obsolete 2SA1774T1. The key advantage is ROHS3 compliance and active product status, ensuring long-term availability. The only difference is packaging format (Tape & Reel vs. bulk), which does not affect electrical performance or PCB assembly compatibility.

The S2SA1774G offers an alternative from onsemi with identical electrical specifications and package footprint. This part provides extended operating temperature range (-55°C to 150°C vs. 0°C to 150°C) and active product status with ROHS3 compliance.

For Enhanced Current Capability:

The 2DA1774Q-7-F and 2DA1774R-7-F from Diodes Incorporated provide 150 mA collector current rating (50% higher than the original 100 mA specification) while maintaining all other critical electrical parameters. These parts use the SOT-523 package, which requires PCB layout modification but offers superior current handling. The 2DA1774R-7-F additionally provides higher DC current gain (180 vs. 120), improving circuit efficiency.

The 2SA1774TLQ from Rohm Semiconductor similarly provides 150 mA collector current with the EMT3 package variant. This part maintains the same electrical specifications as the original while offering enhanced current capacity and active product status.

Compliance Considerations:

All recommended substitutes carry ROHS3 compliance certification, addressing regulatory requirements for new designs. The original 2SA1774T1 is RoHS non-compliant and obsolete; migration to any active substitute ensures compliance with current environmental standards.

Frequently Asked Questions (FAQ)

Q: Can the 2SA1774T1G be used as a direct drop-in replacement for the 2SA1774T1?

A: Yes. The 2SA1774T1G is electrically identical to the 2SA1774T1 with the same SC-75 (SOT-416) package footprint. The only difference is packaging format (Tape & Reel). No circuit modifications are required.

Q: What is the difference between the 2SA1774T1G and S2SA1774G?

A: Both parts are electrically identical with 100 mA collector current and 50 V breakdown voltage. The S2SA1774G provides an extended operating temperature range (-55°C to 150°C) compared to the standard range. Select S2SA1774G if your application requires operation below 0°C.

Q: Can I use the 2DA1774Q-7-F or 2DA1774R-7-F as substitutes?

A: Yes, with PCB layout modification. These Diodes Incorporated parts provide 150 mA collector current (vs. 100 mA) and maintain all critical electrical parameters. However, they use the SOT-523 package instead of SC-75 (SOT-416), requiring different PCB footprint and trace routing. The 2DA1774R-7-F offers higher DC current gain (180 vs. 120).

Q: What is the advantage of the 2SA1774TLQ from Rohm Semiconductor?

A: The 2SA1774TLQ provides 150 mA collector current with the EMT3 package variant. It maintains identical electrical specifications to the original 2SA1774T1 while offering enhanced current capacity. Package compatibility depends on your PCB design; verify EMT3 footprint compatibility before selection.

Q: Are all substitute parts RoHS compliant?

A: Yes. All recommended substitutes (2SA1774T1G, S2SA1774G, 2DA1774Q-7-F, 2DA1774R-7-F, and 2SA1774TLQ) carry ROHS3 compliance certification. The original 2SA1774T1 is RoHS non-compliant.

Q: Which substitute should I select for a new design?

A: For new designs requiring identical package footprint and specifications, select 2SA1774T1G or S2SA1774G. If your application requires higher collector current capacity and can accommodate package changes, select 2DA1774R-7-F (higher current gain) or 2SA1774TLQ (alternative package option).

Q: What is the inventory status of these substitutes?

A: 2SA1774T1G has 2,780 units in stock. S2SA1774G has 4,564 units. 2DA1774Q-7-F has 36,300 units. 2DA1774R-7-F has 6,400 units. 2SA1774TLQ has 90,200 units in stock.

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