BSP19TA Equivalent & Substitute Parts

Part Overview

The BSP19TA is an NPN bipolar junction transistor manufactured by Diodes Incorporated, designed for surface mount applications in the SOT-223-3 package. This device operates at a maximum collector voltage of 350 V with a collector current rating of 500 mA and a maximum power dissipation of 2 W. The BSP19TA is classified as obsolete, necessitating the identification of equivalent and substitute components for ongoing design requirements and production continuity. Substitute parts are selected based on electrical performance parameters, mechanical compatibility, and package specifications that allow direct or near-direct replacement in circuit applications.

Key Parameters

Parameter	BSP19TA	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	350	V
Current - Collector (Ic) (Max)	500	mA
Power - Max	2	W
Frequency - Transition	70	MHz
Vce Saturation (Max) @ Ib, Ic	500mV @ 4mA, 50mA	—
DC Current Gain (hFE) (Min) @ Ic, Vce	50 @ 100mA, 5V	—
Current - Collector Cutoff (Max)	20	nA
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-261-4, TO-261AA	—
Supplier Device Package	SOT-223-3	—
Product Status	Obsolete	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitute parts for the BSP19TA are identified based on the following electrical and mechanical criteria:

Primary Selection Criteria:

Transistor Type: NPN configuration
Package Compatibility: SOT-223 surface mount package (TO-261-4, TO-261AA)
Voltage Rating: Collector-Emitter breakdown voltage equal to or greater than 350 V (for direct replacement) or lower voltage ratings for reduced-stress applications
Current Rating: Collector current capacity of 500 mA or greater (for direct replacement) or lower ratings for current-limited applications
Power Dissipation: Maximum power rating of 2 W or greater
Frequency Response: Transition frequency of 70 MHz or greater
Saturation Characteristics: Vce saturation performance suitable for switching applications

Substitution Logic:

Substitute parts are grouped into two categories based on electrical compatibility:

Direct Electrical Equivalents (BSP19,115): Parts maintaining the 350 V voltage rating and 70 MHz transition frequency, with reduced current and power ratings suitable for lower-current applications.
Reduced-Voltage Substitutes (BF720,115 and BF720T1G): Parts with 300 V voltage ratings, suitable for applications where the full 350 V rating is not required, offering active product status and automotive qualification.
High-Current Substitutes (PZTA42T1G): Parts with 500 mA current rating matching the original specification but with reduced voltage rating (300 V), suitable for applications prioritizing current handling over voltage margin.
Low-Current Substitutes (PZTA42,115, BF720,115, BF720T1G): Parts with 100 mA current ratings, suitable for signal-level switching and low-power applications.
Non-Equivalent Part (PBSS4350Z,135): This part exhibits significantly different electrical characteristics (50 V, 3 A) and is not suitable as a substitute for the BSP19TA despite package compatibility.

Parameter Comparison

Parameter	BSP19TA	BSP19,115	BF720,115	BF720T1G	PZTA42,115	PZTA42T1G	PBSS4350Z,135
Manufacturer	Diodes Inc.	Nexperia USA Inc.	Nexperia USA Inc.	onsemi	Nexperia USA Inc.	onsemi	Nexperia USA Inc.
Transistor Type	NPN	NPN	NPN	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	350 V	350 V	300 V	300 V	300 V	300 V	50 V
Current - Collector (Ic) (Max)	500 mA	100 mA	100 mA	100 mA	100 mA	500 mA	3 A
Power - Max	2 W	1.2 W	1.2 W	1.5 W	1.2 W	1.5 W	2 W
Frequency - Transition	70 MHz	70 MHz	60 MHz	60 MHz	50 MHz	50 MHz	100 MHz
Vce Saturation (Max) @ Ib, Ic	500mV @ 4mA, 50mA	500mV @ 4mA, 50mA	600mV @ 5mA, 30mA	600mV @ 5mA, 30mA	500mV @ 2mA, 20mA	500mV @ 2mA, 20mA	290mV @ 200mA, 2A
DC Current Gain (hFE) (Min) @ Ic, Vce	50 @ 100mA, 5V	40 @ 20mA, 10V	50 @ 25mA, 20V	50 @ 25mA, 20V	40 @ 30mA, 10V	40 @ 30mA, 10V	100 @ 2A, 2V
Current - Collector Cutoff (Max)	20 nA	20 nA	10 nA	10 nA	20 nA	100 nA	100 nA
Operating Temperature Range	-55 to 150°C	150°C	150°C	-65 to 150°C	150°C	150°C	150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-261-4, TO-261AA	TO-261-4, TO-261AA	TO-261-4, TO-261AA	TO-261-4, TO-261AA	TO-261-4, TO-261AA	TO-261-4, TO-261AA	TO-261-4, TO-261AA
Supplier Device Package	SOT-223-3	SOT-223	SOT-223	SOT-223 (TO-261)	SOT-223	SOT-223 (TO-261)	SOT-223
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Automotive Grade	—	AEC-Q101	AEC-Q101	—	AEC-Q101	—	AEC-Q100

Engineering Selection Recommendations

For Direct Voltage and Frequency Equivalence:

BSP19,115 (Nexperia USA Inc.) maintains the 350 V collector-emitter breakdown voltage and 70 MHz transition frequency of the original BSP19TA. This part is suitable for applications requiring the full voltage rating and frequency response. The BSP19,115 carries AEC-Q101 automotive qualification and is RoHS3 compliant, addressing regulatory requirements not met by the obsolete original part. The reduced current rating (100 mA versus 500 mA) limits this substitute to lower-current applications.

For Reduced-Voltage Applications with Active Status:

BF720,115 (Nexperia USA Inc.) and BF720T1G (onsemi) both operate at 300 V, suitable for applications where the full 350 V rating is not required. Both parts are active products with RoHS3 compliance. BF720T1G offers an extended operating temperature range (-65 to 150°C) compared to BF720,115 (150°C maximum). Both parts carry 60 MHz transition frequency, slightly lower than the original 70 MHz specification. BF720T1G provides 1.5 W power dissipation versus 1.2 W for BF720,115.

For Current-Matched Substitution:

PZTA42T1G (onsemi) matches the 500 mA collector current rating of the BSP19TA while operating at 300 V. This part is suitable for applications prioritizing current handling capacity over voltage margin. The part is RoHS3 compliant and active. The 50 MHz transition frequency is lower than the original specification. Power dissipation is rated at 1.5 W.

For Signal-Level Applications:

PZTA42,115 (Nexperia USA Inc.) and BF720,115 (Nexperia USA Inc.) are suitable for low-current switching applications requiring 100 mA or less. Both parts carry AEC-Q101 automotive qualification and RoHS3 compliance. PZTA42,115 operates at 300 V with 50 MHz transition frequency. BF720,115 operates at 300 V with 60 MHz transition frequency.

Not Recommended:

PBSS4350Z,135 (Nexperia USA Inc.) exhibits fundamentally different electrical characteristics (50 V, 3 A) and is not suitable as a substitute for the BSP19TA despite package compatibility. This part is designed for low-voltage, high-current applications and does not meet the voltage or frequency requirements of the original specification.

Frequently Asked Questions (FAQ)

Q: Can BSP19,115 be used as a direct replacement for BSP19TA in all applications?

A: BSP19,115 maintains the 350 V voltage rating and 70 MHz transition frequency of the BSP19TA. However, the reduced current rating (100 mA versus 500 mA) restricts its use to applications drawing 100 mA or less. Circuit redesign may be required for applications utilizing the full 500 mA current capability of the original part.

Q: What is the primary difference between BF720,115 and BF720T1G?

A: Both parts operate at 300 V with 60 MHz transition frequency and 100 mA current rating. BF720T1G offers an extended operating temperature range (-65 to 150°C) compared to BF720,115 (150°C maximum). BF720T1G provides 1.5 W power dissipation versus 1.2 W for BF720,115.

Q: Is PZTA42T1G suitable for applications requiring 500 mA current at 350 V?

A: PZTA42T1G provides the 500 mA current rating but operates at a maximum of 300 V. This part is suitable only for applications where the operating voltage does not exceed 300 V. Applications requiring both 500 mA current and 350 V voltage rating cannot use this substitute.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all substitute parts listed are RoHS3 compliant. The original BSP19TA is RoHS non-compliant. Substitution with any of the listed parts addresses RoHS compliance requirements.

Q: Do the substitute parts carry automotive qualification?

A: BSP19,115, BF720,115, and PZTA42,115 carry AEC-Q101 automotive qualification. BF720T1G and PZTA42T1G do not carry automotive qualification. PBSS4350Z,135 carries AEC-Q100 automotive qualification but is not electrically equivalent to the BSP19TA.

Q: What is the significance of the SOT-223 package designation across all parts?

A: All parts, including the original BSP19TA, use the SOT-223 surface mount package (TO-261-4, TO-261AA case). This ensures mechanical and pin compatibility for direct board-level substitution without layout modifications.

Q: Can PBSS4350Z,135 be used in place of BSP19TA?

A: No. PBSS4350Z,135 is designed for low-voltage (50 V), high-current (3 A) applications. The 50 V rating is insufficient for applications requiring the 350 V capability of the BSP19TA. This part is not electrically equivalent despite package compatibility.

Q: Which substitute part is most suitable for new designs requiring automotive qualification?

A: BSP19,115, BF720,115, and PZTA42,115 all carry AEC-Q101 automotive qualification and RoHS3 compliance. Selection depends on specific voltage and current requirements. BSP19,115 is recommended for applications requiring 350 V operation. BF720,115 and PZTA42,115 are suitable for 300 V applications.

Q: What is the impact of reduced transition frequency in substitute parts?

A: BF720,115 and BF720T1G operate at 60 MHz (versus 70 MHz for BSP19TA). PZTA42,115 and PZTA42T1G operate at 50 MHz. These reductions may affect switching speed in high-frequency applications. Circuit performance analysis is required for applications operating near the transition frequency limits.

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