2SA1797-Q-TP Equivalent & Substitute Parts

Part Overview

The 2SA1797-Q-TP is a PNP bipolar junction transistor manufactured by Micro Commercial Co, designed for surface mount applications in the SOT-89 package. This component operates at a maximum collector current of 2 A, collector-emitter breakdown voltage of 50 V, and maximum power dissipation of 500 mW with a transition frequency of 200 MHz. The part is classified as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. Substitute parts must maintain electrical compatibility across critical parameters including voltage ratings, current capacity, and thermal characteristics while accommodating modern active product availability.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) Max	2	A
Voltage - Collector Emitter Breakdown (Max)	50	V
Power - Max	500	mW
Frequency - Transition	200	MHz
Package / Case	TO-243AA	—
Mounting Type	Surface Mount	—
Operating Temperature Range	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the 2SA1797-Q-TP is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Transistor polarity: PNP configuration
Maximum collector current: 2 A minimum
Collector-emitter breakdown voltage: 50 V minimum
Package type: TO-243AA (SOT-89 supplier designation)
Mounting technology: Surface mount
RoHS compliance: ROHS3 Compliant

Acceptable Variation Parameters:

Transition frequency: Equal to or greater than 200 MHz
Maximum power dissipation: Equal to or greater than 500 mW
DC current gain (hFE): Equal to or greater than specified minimum values
Vce saturation: Lower values indicate improved performance
Operating temperature maximum: Equal to or greater than 150°C

The substitute parts 2SA2153-TD-E and PBSS5250X,115 meet all critical matching parameters and are therefore electrically and mechanically compatible with the 2SA1797-Q-TP in applications where the original part is no longer available.

Parameter Comparison

Parameter	2SA1797-Q-TP	2SA2153-TD-E	PBSS5250X,115	Unit
Manufacturer	Micro Commercial Co	onsemi	Nexperia USA Inc.	—
Product Status	Obsolete	Active	Active	—
Transistor Type	PNP	PNP	PNP	—
Current - Collector (Ic) Max	2	2	2	A
Voltage - Collector Emitter Breakdown (Max)	50	50	50	V
Vce Saturation (Max)	350 @ 50mA, 1A	400 @ 50mA, 1A	320 @ 200mA, 2A	mV
Current - Collector Cutoff (Max)	100	1	100	nA
DC Current Gain (hFE) Min	120 @ 500mA, 2V	200 @ 100mA, 2V	200 @ 1A, 2V	—
Power - Max	500	3.5	1	W
Frequency - Transition	200	420	100	MHz
Operating Temperature Max	150	150	150	°C
Package / Case	TO-243AA	TO-243AA	TO-243AA	—
Supplier Device Package	SOT-89	PCP	SOT-89	—
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	—

Engineering Selection Recommendations

2SA2153-TD-E (onsemi)

The 2SA2153-TD-E is an active product with enhanced electrical performance characteristics. This substitute provides superior transition frequency (420 MHz versus 200 MHz), increased maximum power dissipation (3.5 W versus 500 mW), and improved DC current gain (200 minimum versus 120 minimum). The part maintains identical voltage and current ratings with the same TO-243AA package footprint. ROHS3 compliance and unlimited moisture sensitivity level ensure regulatory and environmental compatibility. This substitute is suitable for applications requiring higher frequency operation or improved thermal performance.

PBSS5250X,115 (Nexperia USA Inc.)

The PBSS5250X,115 is an active automotive-grade product qualified to AEC-Q100 standards. This substitute maintains the original 2SA1797-Q-TP electrical specifications with identical maximum collector current (2 A) and collector-emitter breakdown voltage (50 V). The part features improved Vce saturation characteristics (320 mV at 2 A versus 350 mV at 1 A) and equivalent DC current gain performance. The SOT-89 supplier device package provides direct footprint compatibility. ROHS3 compliance, unlimited moisture sensitivity level, and automotive qualification make this substitute appropriate for applications requiring enhanced reliability and traceability.

Both substitutes are electrically and mechanically compatible with the 2SA1797-Q-TP. Selection between them depends on application-specific requirements for frequency response, power dissipation, and automotive qualification status.

Frequently Asked Questions (FAQ)

Q: Can the 2SA2153-TD-E directly replace the 2SA1797-Q-TP in existing designs?

A: Yes. The 2SA2153-TD-E maintains identical maximum collector current (2 A), collector-emitter breakdown voltage (50 V), and TO-243AA package configuration. The enhanced transition frequency (420 MHz) and power dissipation (3.5 W) provide performance margins above the original specification. Pin configuration and footprint compatibility are maintained.

Q: What is the difference between the SOT-89 and PCP package designations?

A: SOT-89 and PCP are supplier device package designations for the same TO-243AA case outline. Both refer to the identical physical package with three leads in a surface mount configuration. The different designations reflect manufacturer nomenclature conventions and do not affect mechanical or electrical compatibility.

Q: Is the PBSS5250X,115 suitable for automotive applications?

A: Yes. The PBSS5250X,115 carries AEC-Q100 automotive qualification and is designated as automotive grade. This qualification indicates compliance with automotive reliability and testing standards. The 2SA2153-TD-E and original 2SA1797-Q-TP do not carry automotive qualification designations.

Q: How do the DC current gain specifications compare across the three parts?

A: The 2SA1797-Q-TP specifies minimum hFE of 120 at 500 mA and 2 V. The 2SA2153-TD-E specifies minimum hFE of 200 at 100 mA and 2 V. The PBSS5250X,115 specifies minimum hFE of 200 at 1 A and 2 V. Both substitutes provide equal or superior current gain performance at their respective test conditions.

Q: What is the significance of the collector cutoff current (ICBO) differences?

A: The 2SA1797-Q-TP and PBSS5250X,115 specify ICBO of 100 nA, while the 2SA2153-TD-E specifies 1 µA. Lower collector cutoff current indicates reduced leakage in the off state. The 2SA2153-TD-E value remains within acceptable limits for most applications and does not preclude substitution.

Q: Are all three parts RoHS3 compliant?

A: Yes. The 2SA1797-Q-TP, 2SA2153-TD-E, and PBSS5250X,115 are all ROHS3 compliant. All parts carry unlimited moisture sensitivity level (MSL 1), indicating no special moisture handling requirements during storage or assembly.

Q: Why is the 2SA1797-Q-TP classified as obsolete?

A: Obsolete status indicates the part is no longer manufactured or supported by the original supplier. The substitute parts 2SA2153-TD-E and PBSS5250X,115 are active products with current manufacturing and supply availability, making them appropriate alternatives for new designs and ongoing production requirements.

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