Equivalent & Substitute Parts for 2SA1774G

Part Overview

The 2SA1774G is a PNP bipolar junction transistor manufactured by onsemi, designed for surface mount applications in the SC-75 (SOT-416) package. This component operates at a maximum collector current of 100 mA, collector-emitter breakdown voltage of 50 V, and maximum power dissipation of 150 mW. The 2SA1774G is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and production continuity. Active alternatives with identical or superior electrical characteristics are available from multiple manufacturers.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) Max	100	mA
Voltage - Collector Emitter Breakdown (Max)	50	V
Vce Saturation (Max) @ Ib, Ic	500 mV @ 5 mA, 50 mA	—
DC Current Gain (hFE) Min @ Ic, Vce	120 @ 1 mA, 6 V	—
Power - Max	150	mW
Frequency - Transition	140	MHz
Operating Temperature (TJ)	150	°C
Mounting Type	Surface Mount	—
Package / Case	SC-75, SOT-416	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the 2SA1774G are classified into two categories based on electrical and mechanical compatibility:

Direct Equivalents maintain identical electrical specifications, package form factor, and operational characteristics. These parts are pin-compatible and can replace the 2SA1774G without circuit modification.

Parametric Equivalents provide the same core electrical performance (collector current, breakdown voltage, power dissipation, transition frequency, and DC current gain) but may differ in secondary characteristics such as operating temperature range or cutoff current specifications. These parts function identically in typical applications.

Similar Substitutes share the same transistor type (PNP), voltage rating (50 V), and transition frequency (140 MHz) but differ in one or more of the following parameters: collector current rating, power dissipation, package form factor, or DC current gain. Selection of similar substitutes requires verification that the application does not depend on the differing parameters.

The critical parameters determining substitution eligibility are:

Transistor Type: PNP
Collector-Emitter Breakdown Voltage: 50 V minimum
Transition Frequency: 140 MHz minimum
DC Current Gain (hFE): 120 minimum @ 1 mA, 6 V
Vce Saturation: 500 mV maximum @ 5 mA, 50 mA

Parameter Comparison

Part Number	Manufacturer	Product Status	Ic (Max) mA	Vce(br) V	Power (Max) mW	Frequency MHz	hFE (Min)	Package	Packaging Type
2SA1774G	onsemi	Obsolete	100	50	150	140	120	SC-75, SOT-416	Cut Tape (CT) & Digi-Reel®
2SA1774T1G	onsemi	Active	100	50	150	140	120	SC-75, SOT-416	Tape & Reel (TR)
S2SA1774G	onsemi	Active	100	50	150	140	120	SC-75, SOT-416	Tape & Reel (TR)
2DA1774R-7-F	Diodes Incorporated	Active	150	50	150	140	180	SOT-523	Tape & Reel (TR)
2DA1774Q-7-F	Diodes Incorporated	Active	150	50	150	140	120	SOT-523	Cut Tape (CT)
2PA1774QM,315	Nexperia USA Inc.	Active	100	40	430	100	120	SC-101, SOT-883	Tape & Reel (TR)
2SA1774TLQ	Rohm Semiconductor	Active	150	50	150	140	120	SC-75, SOT-416	Cut Tape (CT) & Digi-Reel®
CMUT5087E TR PBFREE	Central Semiconductor Corp	Active	100	50	350	100	390	SC-89, SOT-490	Tape & Reel (TR)

Engineering Selection Recommendations

Direct Replacement (Recommended for Obsolescence Mitigation)

The 2SA1774T1G and S2SA1774G are direct functional equivalents to the 2SA1774G. Both parts are manufactured by onsemi, maintain identical electrical specifications, and are housed in the SC-75 (SOT-416) package. Both parts carry Active product status and ROHS3 compliance. The 2SA1774T1G is supplied in Tape & Reel packaging, while the S2SA1774G offers extended operating temperature range (-55°C to 150°C) compared to the 2SA1774G specification of 150°C maximum. Selection between these two depends on thermal operating requirements and packaging format availability.

Package-Compatible Alternatives

The 2SA1774TLQ from Rohm Semiconductor provides identical electrical performance with 50 V breakdown voltage, 140 MHz transition frequency, and 120 minimum hFE. This part increases collector current rating to 150 mA and is available in the same SC-75 (SOT-416) package form factor. The 2SA1774TLQ is supplied in Cut Tape & Digi-Reel® format, matching the original packaging type of the 2SA1774G.

Higher Current Capability Alternatives

The 2DA1774R-7-F and 2DA1774Q-7-F from Diodes Incorporated both provide 150 mA collector current capability (versus 100 mA in the 2SA1774G) while maintaining 50 V breakdown voltage and 140 MHz transition frequency. These parts are housed in the SOT-523 package, which differs from the SC-75 form factor. The 2DA1774R-7-F offers 180 minimum hFE, exceeding the 120 minimum specification of the 2SA1774G. These parts are suitable for applications requiring higher current handling with different PCB layout considerations.

Voltage-Reduced Alternative

The 2PA1774QM,315 from Nexperia USA Inc. operates at 40 V maximum breakdown voltage (versus 50 V in the 2SA1774G) and 100 MHz transition frequency (versus 140 MHz). This part provides significantly higher power dissipation capability (430 mW versus 150 mW) and carries AEC-Q101 automotive qualification. This part is suitable only for applications where the 40 V voltage rating is sufficient and the reduced transition frequency does not impact performance. The SOT-883 package differs from the SC-75 form factor.

Extended Temperature Range Alternative

The CMUT5087E TR PBFREE from Central Semiconductor Corp maintains 50 V breakdown voltage and 100 mA collector current but operates across -65°C to 150°C temperature range. This part provides 350 mW power dissipation and 100 MHz transition frequency. The SOT-523 package differs from the SC-75 form factor. This part is suitable for applications requiring extended low-temperature operation.

Frequently Asked Questions (FAQ)

Q: Can the 2SA1774T1G directly replace the 2SA1774G without circuit modification?

A: Yes. The 2SA1774T1G is electrically and mechanically identical to the 2SA1774G. Both parts are PNP transistors with 100 mA collector current, 50 V breakdown voltage, 150 mW power dissipation, 140 MHz transition frequency, and 120 minimum hFE. Both are housed in the SC-75 (SOT-416) package. The primary difference is packaging format (Tape & Reel versus Cut Tape & Digi-Reel®) and product status (Active versus Obsolete).

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

A: Both parts are onsemi PNP transistors with identical electrical specifications and SC-75 (SOT-416) packaging. The S2SA1774G specifies an extended operating temperature range of -55°C to 150°C, compared to the 2SA1774T1G specification of 150°C maximum. Selection depends on whether the application requires operation at temperatures below 0°C.

Q: Can I use the 2DA1774R-7-F as a substitute for the 2SA1774G?

A: The 2DA1774R-7-F is functionally compatible for applications where collector current does not exceed 100 mA and the SOT-523 package is acceptable. The 2DA1774R-7-F provides 150 mA collector current capability, 50 V breakdown voltage, 140 MHz transition frequency, and 180 minimum hFE. The SOT-523 package differs from the SC-75 form factor, requiring PCB layout modification. The higher hFE specification (180 versus 120) may affect circuit biasing in applications with tight gain tolerance requirements.

Q: Why does the 2PA1774QM,315 have a lower voltage rating than the 2SA1774G?

A: The 2PA1774QM,315 is specified for 40 V maximum breakdown voltage, compared to 50 V in the 2SA1774G. This part is suitable only for applications where the circuit operates below 40 V. The 2PA1774QM,315 provides compensating advantages including higher power dissipation (430 mW versus 150 mW) and automotive qualification (AEC-Q101). The reduced transition frequency (100 MHz versus 140 MHz) may limit high-frequency performance.

Q: What package considerations apply when selecting substitute parts?

A: The 2SA1774G is housed in the SC-75 (SOT-416) package. Direct package-compatible substitutes include the 2SA1774T1G, S2SA1774G, and 2SA1774TLQ. Substitutes using different packages (SOT-523, SOT-883, SOT-490) require PCB layout modification, including different pad spacing, trace routing, and thermal management considerations. Package selection affects assembly compatibility and thermal performance.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed in this reference are ROHS3 compliant. The 2SA1774G and all equivalent and substitute parts meet RoHS3 requirements for hazardous substance restrictions.

Q: What is the significance of the Moisture Sensitivity Level (MSL) rating?

A: All parts listed, including the 2SA1774G and all substitutes, carry MSL 1 (Unlimited) rating. This indicates that these components have unlimited shelf life and do not require special moisture control during storage or handling. No baking or desiccant storage is required prior to assembly.

Q: Can the CMUT5087E TR PBFREE be used in applications requiring 140 MHz transition frequency?

A: The CMUT5087E TR PBFREE is specified for 100 MHz transition frequency, compared to 140 MHz in the 2SA1774G. This part is suitable only for applications where the circuit operates at or below 100 MHz. Applications requiring 140 MHz or higher transition frequency must use parts meeting or exceeding this specification, such as the 2SA1774T1G, S2SA1774G, 2DA1774R-7-F, 2DA1774Q-7-F, or 2SA1774TLQ.

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