Equivalent & Substitute Parts for 2DA1774Q-7

Part Overview

The 2DA1774Q-7 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 transition frequency of 140 MHz. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives that maintain electrical and mechanical compatibility within specified parameter tolerances.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Collector Current (Max)	150	mA
Collector-Emitter Breakdown Voltage (Max)	50	V
Vce Saturation (Max)	500	mV @ 5mA, 50mA
Collector Cutoff Current (Max)	100	nA
DC Current Gain (hFE Min)	120	@ 1mA, 6V
Power Dissipation (Max)	150	mW
Transition Frequency	140	MHz
Operating Temperature Range	−55 to 150	°C
Mounting Type	Surface Mount	—
Package	SOT-523	—
RoHS Status	ROHS3 Compliant	—
MSL Rating	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the 2DA1774Q-7 are classified into three categories based on electrical parameter alignment and package compatibility:

Category 1: Parametric Equivalents (Identical Electrical Specifications, Same Package) Parts in this category maintain all critical electrical parameters within the specified tolerances of the original component and utilize the same SOT-523 package. These substitutes are direct replacements without circuit redesign requirements.

Category 2: Direct Manufacturer Equivalents (Identical Electrical Specifications, Alternative Package) Parts in this category match all electrical specifications but employ different surface mount packages (EMT3, SC-75, SOT-416). These substitutes require PCB layout modifications to accommodate the alternative package footprint.

Category 3: Manufacturer Recommended Alternatives (Modified Electrical Specifications) Parts in this category are manufacturer-recommended substitutes with variations in specific parameters such as power dissipation, transition frequency, or DC current gain. These alternatives maintain functional compatibility within the application's operating envelope but may require circuit validation.

Key Parameters Determining Substitution Eligibility:

Transistor Type: PNP (mandatory match)
Collector Current (Max): 150 mA minimum
Collector-Emitter Breakdown Voltage: 50 V minimum
Vce Saturation: 500 mV maximum @ specified bias conditions
DC Current Gain (hFE): 120 minimum @ 1mA, 6V
Operating Temperature: −55°C to 150°C minimum range
RoHS3 Compliance and MSL 1 rating

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce(br) V	Vce Sat mV	hFE Min	Power mW	Freq MHz	Package	Status
2DA1774Q-7	Diodes Inc.	150	50	500	120	150	140	SOT-523	Discontinued
2DA1774Q-7-F	Diodes Inc.	150	50	500	120	150	140	SOT-523	Active
2SA1774TLQ	Rohm Semi.	150	50	500	120	150	140	EMT3	Active
2PA1576Q,115	NXP Semi.	150	50	500	120	200	100	SOT-323	Active
2PA1576Q,135	Nexperia USA	150	50	500	120	200	100	SOT-323	Active
2PA1576R,115	Nexperia USA	150	50	500	180	200	100	SOT-323	Active
2PA1576R,135	Nexperia USA	150	50	500	180	200	100	SOT-323	Active
2PA1774SM,315	NXP Semi.	100	40	200	270	430	100	SOT-883	Active
2SA1774T1G	onsemi	100	50	500	120	150	140	SC-75	Active
2SA2029FHAT2LQ	Rohm Semi.	150	50	500	120	150	140	VMT3	Active

Engineering Selection Recommendations

Primary Recommendation: 2DA1774Q-7-F The 2DA1774Q-7-F from Diodes Incorporated is the optimal substitute, providing identical electrical specifications and package compatibility with the discontinued 2DA1774Q-7. This part maintains all critical parameters including 150 mA collector current, 50 V breakdown voltage, 140 MHz transition frequency, and SOT-523 surface mount package. The part is currently in active production status with substantial inventory availability (36,300 units). RoHS3 compliance and MSL 1 rating are maintained. No circuit modifications or PCB layout changes are required.

Secondary Recommendation: 2SA1774TLQ The 2SA1774TLQ from Rohm Semiconductor provides identical electrical specifications with active product status and high inventory availability (90,200 units). This part requires PCB footprint modification due to the EMT3 package (SC-75, SOT-416) substitution for the original SOT-523. All electrical parameters including 150 mA collector current, 50 V breakdown voltage, and 140 MHz transition frequency are maintained. RoHS3 compliance and MSL 1 rating apply.

Tertiary Recommendation: 2SA2029FHAT2LQ The 2SA2029FHAT2LQ from Rohm Semiconductor maintains all electrical specifications of the original part with AEC-Q101 automotive qualification. This part requires PCB footprint modification due to the VMT3 package (SOT-723) substitution. Inventory availability is adequate (7,215 units). RoHS3 compliance and MSL 1 rating are maintained.

Alternative Consideration: 2PA1576 Series (Q,115 / Q,135 / R,115 / R,135) The 2PA1576 series from NXP Semiconductors and Nexperia USA Inc. provides manufacturer-recommended alternatives with active product status. These parts maintain 150 mA collector current and 50 V breakdown voltage specifications. Variations include increased power dissipation (200 mW versus 150 mW), reduced transition frequency (100 MHz versus 140 MHz), and modified DC current gain (120 or 180 hFE). These parts require PCB footprint modification due to SOT-323 package substitution. AEC-Q101 automotive qualification is available for Q,135 and R series variants.

Not Recommended: 2PA1774SM,315 The 2PA1774SM,315 exhibits reduced collector current (100 mA versus 150 mA) and reduced collector-emitter breakdown voltage (40 V versus 50 V), making it unsuitable for direct substitution in applications requiring the full 150 mA current capability or 50 V voltage rating.

Frequently Asked Questions (FAQ)

Q: Can the 2DA1774Q-7-F be used as a direct replacement for the 2DA1774Q-7 without any modifications? A: Yes. The 2DA1774Q-7-F maintains identical electrical specifications and the same SOT-523 package footprint. No circuit modifications or PCB layout changes are required. The part is a direct pin-compatible substitute.

Q: What is the primary difference between the 2DA1774Q-7 and the 2SA1774TLQ? A: Both parts maintain identical electrical specifications (150 mA, 50 V, 140 MHz, 150 mW). The primary difference is the package: the 2DA1774Q-7 uses SOT-523, while the 2SA1774TLQ uses EMT3 (SC-75, SOT-416). PCB layout modification is required to accommodate the different footprint.

Q: Are the 2PA1576 series parts suitable substitutes for the 2DA1774Q-7? A: The 2PA1576 series maintains the critical electrical parameters of 150 mA collector current and 50 V breakdown voltage. However, these parts exhibit reduced transition frequency (100 MHz versus 140 MHz) and increased power dissipation (200 mW versus 150 mW). They are manufacturer-recommended alternatives suitable for applications where the reduced frequency specification is acceptable. PCB layout modification is required due to SOT-323 package substitution.

Q: What does the hFE variation between 2PA1576Q and 2PA1576R series indicate? A: The 2PA1576Q series specifies a minimum DC current gain (hFE) of 120 @ 1mA, 6V, while the 2PA1576R series specifies 180 @ 1mA, 6V. Both values exceed the original 2DA1774Q-7 specification of 120 minimum. The higher hFE in the R series indicates improved current amplification characteristics. Selection between these variants depends on circuit biasing requirements.

Q: Why is the 2PA1774SM,315 not recommended as a substitute? A: The 2PA1774SM,315 exhibits reduced maximum collector current (100 mA versus 150 mA) and reduced collector-emitter breakdown voltage (40 V versus 50 V). These reductions make it unsuitable for applications requiring the full 150 mA current capability or 50 V voltage rating of the original part.

Q: Are all recommended substitutes RoHS3 compliant? A: Yes. All recommended substitute parts maintain RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, consistent with the original 2DA1774Q-7 specifications.

Q: What packaging options are available for substitutes? A: Substitute parts are available in multiple surface mount packages: SOT-523 (2DA1774Q-7-F), EMT3/SC-75/SOT-416 (2SA1774TLQ), VMT3/SOT-723 (2SA2029FHAT2LQ), and SOT-323/SC-70 (2PA1576 series). Package selection depends on PCB design constraints and available footprint space.

Q: Do any substitute parts include automotive qualification? A: Yes. The 2PA1576 series (Q,135 and R variants) and 2SA2029FHAT2LQ include AEC-Q101 automotive qualification. These parts are suitable for automotive applications requiring formal qualification documentation.

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