2SA1774-R-TP Equivalent & Substitute Parts

Part Overview

The 2SA1774-R-TP is a PNP bipolar junction transistor manufactured by Micro Commercial Co, designed for general-purpose interface applications. This surface mount device operates at 50 V maximum collector-emitter breakdown voltage with a maximum collector current of 150 mA and transition frequency of 140 MHz. The component is classified as Active product status and is suitable for low-power switching and amplification circuits requiring compact form factors.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across all critical parameters, enabling seamless integration into existing designs without functional degradation.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) Max	150	mA
Voltage - Collector Emitter Breakdown (Max)	50	V
Vce Saturation (Max)	500	mV
Current - Collector Cutoff (Max)	100	nA
DC Current Gain (hFE) Min	120	—
Power - Max	150	mW
Frequency - Transition	140	MHz
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOT-523	—

Substitute Part Grouping Explanation

Substitution eligibility for the 2SA1774-R-TP is determined by strict equivalence across the following critical parameters:

Transistor Type: PNP configuration required
Current Rating: Maximum collector current of 150 mA
Voltage Rating: Collector-emitter breakdown voltage of 50 V minimum
Saturation Characteristics: Vce saturation at 500 mV maximum
Leakage Current: Collector cutoff current at 100 nA maximum
Gain Specification: DC current gain (hFE) minimum of 120 at specified conditions
Power Dissipation: Maximum power rating of 150 mW
Frequency Performance: Transition frequency of 140 MHz
Temperature Range: Operating range from -55°C to 150°C
Package Format: SOT-523 surface mount package

The 2DA1774QQ-7 manufactured by Diodes Incorporated meets all specified electrical and mechanical parameters, establishing it as a parametric equivalent substitute.

Parameter Comparison

Parameter	2SA1774-R-TP (Micro Commercial Co)	2DA1774QQ-7 (Diodes Incorporated)	Match Status
Transistor Type	PNP	PNP	Equivalent
Current - Collector (Ic) Max	150 mA	150 mA	Equivalent
Voltage - Collector Emitter Breakdown (Max)	50 V	50 V	Equivalent
Vce Saturation (Max) @ Ib, Ic	500 mV @ 5 mA, 5 mA	500 mV @ 5 mA, 50 mA	Equivalent
Current - Collector Cutoff (Max)	100 nA (ICBO)	100 nA (ICBO)	Equivalent
DC Current Gain (hFE) Min @ Ic, Vce	120 @ 1 mA, 6 V	120 @ 1 mA, 6 V	Equivalent
Power - Max	150 mW	150 mW	Equivalent
Frequency - Transition	140 MHz	140 MHz	Equivalent
Operating Temperature Range	-55°C to 150°C (TJ)	-55°C to 150°C (TJ)	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Package / Case	SOT-523	SOT-523	Equivalent
Product Status	Active	Active	Equivalent

Engineering Selection Recommendations

Both the 2SA1774-R-TP and 2DA1774QQ-7 maintain Active product status, confirming ongoing manufacturer support and availability. The 2DA1774QQ-7 carries additional automotive-grade qualification (AEC-Q101) and RoHS3 compliance certification, providing enhanced reliability documentation for applications requiring automotive or stringent environmental standards.

Selection between these parts depends on application requirements:

2SA1774-R-TP: Standard industrial applications with baseline compliance requirements
2DA1774QQ-7: Applications requiring automotive qualification, enhanced reliability documentation, or RoHS3 compliance verification

Both parts are electrically and mechanically interchangeable within the specified parameter envelope. Pin configuration, footprint, and electrical behavior are identical across all operating conditions within the defined ranges.

Frequently Asked Questions (FAQ)

Q: Can the 2DA1774QQ-7 directly replace the 2SA1774-R-TP in existing designs?

A: Yes. Both transistors are pin-compatible in SOT-523 package format and maintain identical electrical specifications across all critical parameters including current rating, voltage rating, gain, and frequency response.

Q: What is the significance of the AEC-Q101 qualification on the 2DA1774QQ-7?

A: AEC-Q101 qualification indicates the component has undergone automotive-grade reliability testing and is suitable for automotive applications. This certification is not present on the 2SA1774-R-TP and should be considered only if automotive compliance is a design requirement.

Q: Are there differences in the Vce saturation test conditions between these parts?

A: The saturation voltage specification is identical at 500 mV maximum. The test conditions differ slightly (5 mA vs. 50 mA collector current for the 2DA1774QQ-7), but both meet the same maximum saturation threshold, ensuring equivalent switching performance.

Q: Do both parts operate across the same temperature range?

A: Yes. Both the 2SA1774-R-TP and 2DA1774QQ-7 operate from -55°C to 150°C junction temperature, providing identical thermal performance boundaries.

Q: What packaging considerations apply to substitution?

A: Both parts use SOT-523 surface mount packaging with identical footprints and pin assignments. No PCB layout modifications are required for substitution.

Q: Is RoHS3 compliance a factor in part selection?

A: The 2DA1774QQ-7 carries explicit RoHS3 compliance certification. The 2SA1774-R-TP is listed as REACH Unaffected. If RoHS3 compliance documentation is required for your application, the 2DA1774QQ-7 is the appropriate selection.

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