Equivalent & Substitute Parts for 2DA1774QLP-7

Part Overview

The 2DA1774QLP-7 is a PNP bipolar junction transistor manufactured by Diodes Incorporated, designed for surface mount applications in the 3-UFDFN package. This component is rated for 40 V collector-emitter breakdown voltage, 100 mA maximum collector current, and 250 mW power dissipation with a transition frequency of 100 MHz. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives that meet the same electrical and mechanical specifications for ongoing design support and production requirements.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Collector Current (Max)	100	mA
Collector-Emitter Breakdown Voltage (Max)	40	V
Power Dissipation (Max)	250	mW
Transition Frequency	100	MHz
Vce Saturation (Max)	200 mV @ 5 mA, 50 mA	—
DC Current Gain (hFE Min)	120 @ 1 mA, 6 V	—
Operating Temperature Range	−55 to 150	°C
Mounting Type	Surface Mount	—
Package	3-UFDFN (X1-DFN1006-3)	—
RoHS Status	ROHS3 Compliant	—
MSL Rating	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the 2DA1774QLP-7 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor type must be PNP
Collector current rating must be ≥100 mA
Collector-emitter breakdown voltage must be ≥40 V
Transition frequency must be ≥100 MHz
Operating temperature range must encompass −55 to 150 °C
RoHS3 compliance and MSL 1 rating required

Package Considerations: Substitutes are grouped into two categories based on package type: direct package equivalents (3-UFDFN) and alternative surface mount packages (SOT-883) that maintain electrical compatibility while offering different form factors and thermal characteristics.

Inventory and Product Status: Active product status with available inventory is prioritized for production continuity. The 2DA1774QLP-7B variant from Diodes Incorporated provides parametric equivalence with identical electrical specifications and active product status.

Parameter Comparison

Part Number	Manufacturer	Ic (Max)	Vce(br)	Power (Max)	Freq (Transition)	Package	Product Status	Compliance
2DA1774QLP-7	Diodes Incorporated	100 mA	40 V	250 mW	100 MHz	3-UFDFN	Discontinued	ROHS3, MSL 1
2DA1774QLP-7B	Diodes Incorporated	100 mA	40 V	250 mW	100 MHz	3-UFDFN	Active	ROHS3, MSL 1
2PA1774QM,315	Nexperia USA Inc.	100 mA	40 V	430 mW	100 MHz	SOT-883	Active	ROHS3, AEC-Q101
BC857AM,315	Nexperia USA Inc.	100 mA	45 V	150 mW	100 MHz	SOT-883	Active	ROHS3, AEC-Q101
BC857BM,315	Nexperia USA Inc.	100 mA	45 V	150 mW	100 MHz	SOT-883	Active	ROHS3, AEC-Q101
BC857CM,315	Nexperia USA Inc.	100 mA	45 V	150 mW	100 MHz	SOT-883	Active	ROHS3, AEC-Q101
PBSS3540MB,315	NXP USA Inc.	500 mA	40 V	250 mW	300 MHz	DFN1006B-3	Active	ROHS3
PMBT3906M,315	Nexperia USA Inc.	200 mA	40 V	590 mW	250 MHz	SOT-883	Active	ROHS3, AEC-Q101

Engineering Selection Recommendations

Direct Replacement (Identical Specifications): The 2DA1774QLP-7B from Diodes Incorporated is the primary substitute, offering identical electrical parameters and package configuration with active product status. This part maintains 100 mA collector current, 40 V breakdown voltage, 250 mW power rating, and 100 MHz transition frequency in the same 3-UFDFN package. ROHS3 compliance and MSL 1 rating are preserved.

Alternative Substitutes with Enhanced Specifications: The 2PA1774QM,315 (Nexperia) provides equivalent electrical performance with increased power dissipation (430 mW) in SOT-883 package. This part meets all minimum electrical requirements and includes AEC-Q101 automotive qualification.

The BC857 series (BC857AM,315, BC857BM,315, BC857CM,315) from Nexperia offers 45 V breakdown voltage (exceeding the 40 V requirement) with 100 mA collector current and 100 MHz transition frequency in SOT-883 package. These parts carry AEC-Q101 qualification and active product status. Differences in DC current gain (hFE) values distinguish the three variants.

The PMBT3906M,315 (Nexperia) provides enhanced current capability (200 mA) and higher transition frequency (250 MHz) with 40 V breakdown voltage and 590 mW power dissipation in SOT-883 package. AEC-Q101 qualification is included.

The PBSS3540MB,315 (NXP) offers significantly higher collector current (500 mA) and transition frequency (300 MHz) while maintaining 40 V breakdown voltage and 250 mW power rating in DFN1006B-3 package.

Product Status Consideration: All recommended substitutes maintain active product status with available inventory, ensuring long-term supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the 2DA1774QLP-7B be used as a direct replacement for the 2DA1774QLP-7?

A: Yes. The 2DA1774QLP-7B is a parametric equivalent with identical electrical specifications (100 mA Ic, 40 V Vce(br), 250 mW power, 100 MHz transition frequency) and package configuration (3-UFDFN). The primary difference is active product status and availability.

Q: What is the difference between the 3-UFDFN and SOT-883 packages?

A: The 3-UFDFN (X1-DFN1006-3) is a smaller form factor package used in the original 2DA1774QLP-7 and 2DA1774QLP-7B. The SOT-883 is a larger surface mount package used in the BC857 and 2PA1774QM series. Both are surface mount technologies; package selection depends on PCB layout constraints and thermal requirements.

Q: Are the BC857 variants (AM, BM, CM) interchangeable?

A: The BC857AM,315, BC857BM,315, and BC857CM,315 share identical electrical ratings (100 mA, 45 V, 100 MHz) but differ in DC current gain (hFE) specifications: AM has minimum 125 hFE, BM has minimum 220 hFE, and CM has minimum 420 hFE. Selection depends on circuit requirements for current gain.

Q: Can I use PMBT3906M,315 in place of 2DA1774QLP-7?

A: The PMBT3906M,315 meets all minimum electrical requirements (100 mA Ic, 40 V Vce(br), 100 MHz minimum transition frequency) and exceeds power dissipation capability (590 mW vs. 250 mW). However, it operates at 200 mA maximum collector current and 250 MHz transition frequency, which are enhanced specifications. Compatibility depends on circuit design margins and PCB layout accommodation of the SOT-883 package.

Q: What does AEC-Q101 qualification mean?

A: AEC-Q101 is an automotive qualification standard for discrete semiconductors. Parts carrying this qualification have undergone additional reliability testing and are suitable for automotive applications. The original 2DA1774QLP-7 does not carry this qualification, while several substitutes (BC857 series, 2PA1774QM, PMBT3906M) do.

Q: Is the PBSS3540MB,315 suitable as a substitute?

A: The PBSS3540MB,315 meets the minimum electrical requirements (40 V Vce(br), 100 MHz minimum transition frequency) with enhanced specifications (500 mA Ic, 300 MHz transition frequency). The primary consideration is the different package (DFN1006B-3 vs. 3-UFDFN), which requires PCB layout modification. This part is suitable only if the application can accommodate higher current capability and the alternative package footprint.

Q: What is MSL 1 rating and why is it important?

A: MSL (Moisture Sensitivity Level) 1 indicates unlimited shelf life without moisture control requirements. All recommended substitutes maintain MSL 1 rating, ensuring compatibility with standard storage and handling procedures.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant, matching the compliance status of the original 2DA1774QLP-7.

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