Equivalent & Substitute Parts for 2DA1774S-7-F

Part Overview

The 2DA1774S-7-F is a PNP bipolar junction transistor manufactured by Diodes Incorporated, designed for surface mount applications in the SOT-523 package. This component operates at 50 V collector-emitter breakdown voltage with a maximum collector current of 150 mA and 150 mW power dissipation. The part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility within specified electrical and mechanical parameters.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	50	V
Current - Collector (Ic) (Max)	150	mA
Power - Max	150	mW
Frequency - Transition	140	MHz
Vce Saturation (Max) @ Ib, Ic	500mV @ 5mA, 50mA	—
DC Current Gain (hFE) (Min) @ Ic, Vce	270 @ 1mA, 6V	—
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOT-523	—

Substitute Part Grouping Explanation

Substitution of the 2DA1774S-7-F is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Transistor polarity (PNP)
Collector-emitter breakdown voltage rating (50 V minimum)
Maximum collector current (150 mA minimum)
Power dissipation capability (150 mW minimum)
Transition frequency (140 MHz minimum)
Saturation voltage characteristics (500mV @ 5mA, 50mA)
Operating temperature range (-55°C to 150°C minimum)

Secondary Compatibility Factors:

Surface mount mounting type
RoHS3 compliance
Moisture sensitivity level (MSL 1)

Substitute parts are grouped into two categories:

Category A - Direct Package Equivalents (SOT-523): Parts maintaining identical SOT-523 packaging with full parameter compliance.

Category B - Functional Equivalents (Alternative Packages): Parts meeting all electrical specifications but utilizing different surface mount packages (SOT-323, SOT-416, SOT-883), suitable for applications where package footprint substitution is permissible.

Parameter Comparison

Part Number	Manufacturer	Product Status	Ic (Max) mA	Vce(br) V	Power mW	Freq MHz	hFE @ 1mA, 6V	Package	Temp Range °C
2DA1774S-7-F	Diodes Incorporated	Obsolete	150	50	150	140	270	SOT-523	-55 to 150
2DA1774R-7-F	Diodes Incorporated	Active	150	50	150	140	180	SOT-523	-55 to 150
2SA1774T1G	onsemi	Active	100	50	150	140	120	SOT-416	-55 to 150
2PA1576Q,115	NXP Semiconductors	Active	150	50	200	100	120	SOT-323	-55 to 150
2PA1576Q,135	Nexperia USA Inc.	Active	150	50	200	100	120	SOT-323	-55 to 150
2PA1576R,115	Nexperia USA Inc.	Active	150	50	200	100	180	SOT-323	-55 to 150
2PA1576R,135	Nexperia USA Inc.	Active	150	50	200	100	180	SOT-323	-55 to 150
2PA1576S,115	Nexperia USA Inc.	Active	150	50	200	100	270	SOT-323	-55 to 150
2PA1576S,135	NXP USA Inc.	Active	150	50	200	100	270	SOT-323	-55 to 150
2PA1774SM,315	NXP Semiconductors	Active	100	40	430	100	270	SOT-883	-55 to 150

Engineering Selection Recommendations

Direct Package Replacement (SOT-523):

The 2DA1774R-7-F from Diodes Incorporated is the primary direct substitute for the obsolete 2DA1774S-7-F. Both components share identical SOT-523 packaging, matching electrical specifications for collector current (150 mA), breakdown voltage (50 V), power dissipation (150 mW), and transition frequency (140 MHz). The 2DA1774R-7-F maintains active product status with RoHS3 compliance and unlimited moisture sensitivity rating. The DC current gain (hFE) of 180 @ 1mA, 6V is lower than the original part's 270, but remains within functional operating parameters for PNP transistor applications.

Alternative Package Substitutes (SOT-323):

The 2PA1576 series from NXP Semiconductors and Nexperia USA Inc. provides functional equivalence with enhanced power dissipation (200 mW versus 150 mW). These components maintain 50 V breakdown voltage and 150 mA collector current ratings. Multiple variants exist with different DC current gain specifications:

2PA1576Q,115 and 2PA1576Q,135: hFE 120 @ 1mA, 6V
2PA1576R,115 and 2PA1576R,135: hFE 180 @ 1mA, 6V
2PA1576S,115 and 2PA1576S,135: hFE 270 @ 1mA, 6V

All 2PA1576 variants carry AEC-Q101 automotive qualification and active product status. Transition frequency is 100 MHz, lower than the original 140 MHz specification. SOT-323 package substitution requires PCB layout modification.

Alternative Package Substitutes (SOT-416):

The 2SA1774T1G from onsemi operates at 50 V breakdown voltage with 100 mA maximum collector current and 140 MHz transition frequency, matching the original frequency specification. This component is packaged in SOT-416 (SC-75) format and carries active product status with RoHS3 compliance. The reduced collector current rating (100 mA versus 150 mA) limits application scope to circuits requiring lower current handling.

Alternative Package Substitutes (SOT-883):

The 2PA1774SM,315 from NXP Semiconductors provides the highest power dissipation (430 mW) among available substitutes. However, this component operates at 40 V breakdown voltage (below the original 50 V specification) and 100 mA maximum collector current. The 100 MHz transition frequency is lower than the original 140 MHz. This part carries AEC-Q101 automotive qualification and active product status. Selection of this component is appropriate only for applications with reduced voltage and current requirements.

Frequently Asked Questions (FAQ)

Q: Can the 2DA1774R-7-F directly replace the 2DA1774S-7-F without PCB modification?

A: Yes. The 2DA1774R-7-F maintains identical SOT-523 packaging and pin configuration. No PCB layout changes are required. Both components share the same base product number (2DA1774) and electrical specifications for voltage, current, and power ratings.

Q: What is the significance of the different DC current gain (hFE) values among substitute parts?

A: DC current gain determines the base current required to achieve a specified collector current. The original 2DA1774S-7-F specifies hFE 270 @ 1mA, 6V. Substitutes with lower hFE values (120 or 180) require proportionally higher base drive current to achieve the same collector current. Circuit designs must accommodate this difference through base resistor adjustment or alternative biasing schemes.

Q: Why do the 2PA1576 series parts have lower transition frequency (100 MHz) compared to the original (140 MHz)?

A: Transition frequency is an inherent characteristic of transistor design and manufacturing. The 2PA1576 series is optimized for different performance parameters, including higher power dissipation (200 mW). Applications requiring the full 140 MHz bandwidth should select the 2SA1774T1G or maintain the 2DA1774R-7-F.

Q: Are the 2PA1576 series parts suitable for automotive applications?

A: Yes. All 2PA1576 variants carry AEC-Q101 automotive qualification and are manufactured by automotive-qualified suppliers (NXP Semiconductors, Nexperia USA Inc.). These parts are appropriate for automotive-grade circuit designs.

Q: What is the impact of package change from SOT-523 to SOT-323?

A: SOT-323 and SOT-523 are both three-terminal surface mount packages with different physical dimensions and land patterns. Substitution requires PCB redesign to accommodate the new footprint. Pin functionality remains identical (base, collector, emitter). Electrical performance is not affected by package change.

Q: Can the 2PA1774SM,315 be used as a direct substitute despite the 40 V breakdown voltage rating?

A: The 2PA1774SM,315 operates at 40 V breakdown voltage, which is below the original 50 V specification. This component is suitable only for applications where the actual circuit voltage does not exceed 40 V. Use of this part in circuits designed for 50 V operation creates reliability risk and is not recommended.

Q: What does RoHS3 compliance indicate?

A: RoHS3 compliance indicates the component meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, hexavalent chromium, and specified brominated flame retardants. All substitute parts listed carry RoHS3 compliance, ensuring environmental and regulatory compatibility.

Q: Are there inventory considerations when selecting substitute parts?

A: Yes. The 2PA1576S,135 maintains the highest inventory availability (270,749 pieces), followed by 2PA1774SM,315 (150,118 pieces). The 2DA1774R-7-F (6,400 pieces) and 2SA1774T1G (2,780 pieces) have more limited availability. Inventory levels should be confirmed with suppliers for production planning.

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