NSVBSP19AT1G Equivalent & Substitute Parts

Part Overview

The NSVBSP19AT1G is a Bipolar (BJT) NPN transistor manufactured by onsemi, designed for general-purpose switching and amplification applications. This device features a 350 V collector-emitter breakdown voltage rating, 100 mA maximum collector current, and 800 mW power dissipation capability in a surface mount SOT-223 package. The part is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and ongoing production requirements.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	350	V
Current - Collector (Ic) (Max)	100	mA
Power - Max	800	mW
Vce Saturation (Max) @ Ib, Ic	500mV @ 4mA, 50mA	—
DC Current Gain (hFE) (Min) @ Ic, Vce	40 @ 20mA, 10V	—
Frequency - Transition	70	MHz
Operating Temperature Range	-65 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-261-4, TO-261AA	—
Supplier Device Package	SOT-223	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the NSVBSP19AT1G is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

Transistor type must be NPN
Collector-emitter breakdown voltage must equal or exceed 350 V
Maximum collector current must equal or exceed 100 mA
Maximum power dissipation must equal or exceed 800 mW
Package and pinout must be compatible with TO-261-4 or TO-261AA footprints

Mechanical Compatibility Criteria:

Surface mount mounting type
SOT-223 package family compatibility
Moisture sensitivity level of 1 (Unlimited) or equivalent

The FJT44TF meets these substitution criteria with enhanced electrical ratings: 400 V breakdown voltage, 300 mA collector current capability, and 2 W power dissipation. Both devices share identical package specifications and mounting characteristics, enabling direct PCB-level substitution.

Parameter Comparison

Parameter	NSVBSP19AT1G	FJT44TF	Unit
Transistor Type	NPN	NPN	—
Voltage - Collector Emitter Breakdown (Max)	350	400	V
Current - Collector (Ic) (Max)	100	300	mA
Power - Max	800	2000	mW
Vce Saturation (Max) @ Ib, Ic	500mV @ 4mA, 50mA	750mV @ 5mA, 50mA	—
DC Current Gain (hFE) (Min) @ Ic, Vce	40 @ 20mA, 10V	50 @ 10mA, 10V	—
Operating Temperature Range	-65 to 150	150 (Max)	°C
Mounting Type	Surface Mount	Surface Mount	—
Package / Case	TO-261-4, TO-261AA	TO-261-4, TO-261AA	—
Supplier Device Package	SOT-223	SOT-223-4	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	—
Product Status	Obsolete	Active	—

Engineering Selection Recommendations

The FJT44TF is a direct substitute for the NSVBSP19AT1G based on the following factors:

Product Status: The NSVBSP19AT1G is classified as obsolete, while the FJT44TF maintains active product status with confirmed inventory availability (16,011 pieces in stock). This ensures long-term supply chain continuity and manufacturing support.

Electrical Ratings: The FJT44TF exceeds the minimum electrical requirements of the NSVBSP19AT1G across all critical parameters. The 400 V breakdown voltage provides 50 V additional margin over the 350 V requirement. The 300 mA collector current rating and 2 W power dissipation capability provide 3× and 2.5× headroom respectively, enabling operation in applications with higher current or power demands without performance degradation.

Compliance and Certifications: Both devices maintain identical REACH compliance status (REACH Unaffected) and ECCN classification (EAR99). The FJT44TF additionally carries RoHS3 compliance certification, meeting current regulatory requirements for electronic components in restricted substance directives.

Package Compatibility: Both devices utilize TO-261-4 and TO-261AA package specifications with SOT-223 family pinouts, enabling direct PCB-level substitution without layout modifications or design rework.

Frequently Asked Questions (FAQ)

Q: Can the FJT44TF directly replace the NSVBSP19AT1G on existing PCBs?

A: Yes. Both devices share identical TO-261-4 and TO-261AA package specifications with SOT-223 pinout compatibility. No PCB layout modifications are required for substitution.

Q: What are the key electrical differences between these devices?

A: The FJT44TF provides enhanced electrical ratings: 400 V breakdown voltage (versus 350 V), 300 mA maximum collector current (versus 100 mA), and 2 W power dissipation (versus 800 mW). These higher ratings ensure compatibility with applications requiring greater electrical headroom.

Q: Why is the NSVBSP19AT1G classified as obsolete?

A: The NSVBSP19AT1G is no longer in active production. The FJT44TF represents the active equivalent offering superior electrical performance and ongoing manufacturing support.

Q: Are there any thermal or operating temperature considerations?

A: The NSVBSP19AT1G specifies an operating temperature range of -65°C to 150°C. The FJT44TF specifies a maximum junction temperature of 150°C. Both devices maintain identical moisture sensitivity levels (MSL 1, Unlimited), indicating equivalent handling and storage requirements.

Q: What is the significance of the higher Vce saturation voltage in the FJT44TF?

A: The FJT44TF exhibits 750 mV saturation voltage at specified test conditions (5 mA base current, 50 mA collector current) compared to 500 mV for the NSVBSP19AT1G. This 250 mV difference reflects the FJT44TF's higher current capability and does not prevent substitution in switching applications where saturation voltage margins are adequate.

Q: Does the FJT44TF meet current regulatory compliance requirements?

A: Yes. The FJT44TF carries RoHS3 compliance certification in addition to REACH compliance (REACH Unaffected) and EAR99 ECCN classification, meeting current electronic component regulatory standards.

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