2SA1791GRL Equivalent & Substitute Parts

Part Overview

The 2SA1791GRL is a PNP bipolar junction transistor manufactured by Panasonic Electronic Components, designed for surface mount applications in the SSMini3-F3 package. This device operates at a maximum collector voltage of 50 V with a maximum collector current of 50 mA and a transition frequency of 250 MHz. The part is classified as obsolete, making equivalent and substitute components necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	50	V
Current - Collector (Ic) (Max)	50	mA
Power - Max	125	mW
Frequency - Transition	250	MHz
Mounting Type	Surface Mount	—
Package / Case	SC-89, SOT-490	—
Operating Temperature (Max)	125	°C
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the 2SA1791GRL is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

Transistor type must be PNP
Voltage - Collector Emitter Breakdown rating must be equal to or greater than 50 V
Current - Collector (Ic) maximum rating must be equal to or greater than 50 mA
Power dissipation rating must be equal to or greater than 125 mW
Frequency - Transition must be equal to or greater than 250 MHz

Mechanical Compatibility Criteria:

Mounting type must be Surface Mount
Package / Case must be SC-89 or SOT-490 compatible
Moisture Sensitivity Level must be 1 (Unlimited) or equivalent

The substitute parts listed below meet or exceed all specified parameters, ensuring functional and physical compatibility with the original 2SA1791GRL design.

Parameter Comparison

Parameter	2SA1791GRL (Panasonic)	2SAR523EBTL (Rohm)	DTA043TEBTL (Rohm)
Transistor Type	PNP	PNP	PNP - Pre-Biased
Voltage - Collector Emitter Breakdown (Max)	50 V	50 V	50 V
Current - Collector (Ic) (Max)	50 mA	100 mA	100 mA
Power - Max	125 mW	150 mW	150 mW
Frequency - Transition	250 MHz	300 MHz	250 MHz
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	SC-89, SOT-490	SC-89, SOT-490	SC-89, SOT-490
Operating Temperature (Max)	125°C	150°C	150°C
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active	Active

Engineering Selection Recommendations

2SAR523EBTL (Rohm Semiconductor): This substitute provides direct electrical and mechanical compatibility with the 2SA1791GRL. The 2SAR523EBTL exceeds the original specifications in collector current (100 mA vs. 50 mA), power dissipation (150 mW vs. 125 mW), and transition frequency (300 MHz vs. 250 MHz). The device is classified as Active product status with ROHS3 compliance and REACH Unaffected designation. This part is suitable for applications requiring standard PNP transistor functionality without integrated biasing networks.

DTA043TEBTL (Rohm Semiconductor): This substitute is a pre-biased PNP transistor that meets the electrical and mechanical requirements of the 2SA1791GRL. The DTA043TEBTL includes an integrated 4.7 kOhms base resistor network, which differentiates it from the original part. This device is classified as Active product status with ROHS3 compliance and REACH Unaffected designation. Selection of this part is appropriate only when the integrated biasing network aligns with circuit design requirements. Direct substitution without circuit modification is not recommended if the original design does not account for the pre-biased configuration.

Both substitute parts are available in active production with superior availability compared to the obsolete 2SA1791GRL.

Frequently Asked Questions (FAQ)

Q: Can the 2SAR523EBTL directly replace the 2SA1791GRL without circuit modification?

A: Yes. The 2SAR523EBTL is a standard PNP transistor that meets or exceeds all electrical and mechanical parameters of the 2SA1791GRL. No circuit modification is required for direct substitution.

Q: Can the DTA043TEBTL directly replace the 2SA1791GRL without circuit modification?

A: No. The DTA043TEBTL is a pre-biased transistor with an integrated 4.7 kOhms base resistor. Direct substitution requires circuit design verification to confirm compatibility with the integrated biasing network. Use this part only when the circuit design accommodates the pre-biased configuration.

Q: Are the substitute parts available in the same package as the 2SA1791GRL?

A: Yes. Both substitute parts use the SC-89 / SOT-490 package designation, which is mechanically compatible with the original SSMini3-F3 package specification.

Q: What is the difference in collector current rating between the original and substitute parts?

A: The 2SA1791GRL has a maximum collector current of 50 mA. Both substitute parts (2SAR523EBTL and DTA043TEBTL) have a maximum collector current of 100 mA, providing additional current handling capacity.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both 2SAR523EBTL and DTA043TEBTL are ROHS3 compliant and REACH Unaffected, meeting current environmental and regulatory requirements.

Q: What is the moisture sensitivity level of the substitute parts?

A: Both substitute parts have Moisture Sensitivity Level (MSL) 1 (Unlimited), matching the original 2SA1791GRL specification.

Q: Which substitute part should be selected for new designs?

A: For new designs requiring a standard PNP transistor without integrated biasing, select the 2SAR523EBTL. For designs that benefit from integrated base biasing, select the DTA043TEBTL. Both parts are in active production with superior long-term availability.

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