2N5190 Equivalent & Substitute Parts

Part Overview

The 2N5190 is an NPN bipolar junction transistor manufactured by onsemi, rated for 40 V collector-emitter breakdown voltage and 4 A maximum collector current in a TO-126 through-hole package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. The 2N5190 delivers 40 W maximum power dissipation with a 2 MHz transition frequency, suitable for general-purpose switching and amplification circuits operating within its specified electrical envelope.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) Max	4	A
Voltage - Collector Emitter Breakdown (Max)	40	V
Power - Max	40	W
Frequency - Transition	2	MHz
Vce Saturation (Max) @ Ib, Ic	1.4V @ 1A, 4A	V
DC Current Gain (hFE) Min @ Ic, Vce	25 @ 1.5A, 2V	—
Operating Temperature Range	-65 to 150	°C
Mounting Type	Through Hole	—
Package / Case	TO-126-3	—

Substitute Part Grouping Explanation

Substitution of the 2N5190 is determined by electrical parameter compatibility within the following criteria:

Direct Electrical Equivalence: Parts must maintain NPN transistor type, support minimum 4 A collector current, withstand minimum 40 V collector-emitter breakdown voltage, and deliver minimum 40 W power dissipation. These parameters define the functional operating envelope for direct replacement.

Package Compatibility: Through-hole mounting in TO-126 or TO-126-3 package variants ensures mechanical and thermal interface compatibility with existing PCB layouts and heat management infrastructure.

Saturation Characteristics: Vce saturation voltage at specified base and collector currents determines switching performance in saturated operation. Parts with comparable saturation behavior maintain circuit timing and efficiency characteristics.

Current Gain (hFE): Minimum DC current gain at specified operating points ensures adequate base drive requirements and circuit biasing stability.

Frequency Response: Transition frequency determines high-frequency performance limits. Parts with equal or higher transition frequency maintain or improve circuit bandwidth.

Compliance Status: RoHS and REACH compliance certifications determine suitability for regulated manufacturing environments and end-market applications.

Parameter Comparison

Parameter	2N5190	2N5190G	BD17510STU	BD135	BD437
Manufacturer	onsemi	onsemi	onsemi	STMicroelectronics	STMicroelectronics
Product Status	Obsolete	Active	Last Time Buy	Active	Not For New Designs
Transistor Type	NPN	NPN	NPN	NPN	NPN
Ic (Max) [A]	4	4	3	1.5	4
Vce Breakdown (Max) [V]	40	40	45	45	45
Power - Max [W]	40	40	30	1.25	36
Frequency - Transition [MHz]	2	2	3	—	3
Vce Saturation (Max) [V]	1.4 @ 1A, 4A	1.4 @ 1A, 4A	0.8 @ 0.1A, 1A	0.5 @ 0.05A, 0.5A	0.6 @ 0.2A, 2A
DC Current Gain (hFE) Min	25 @ 1.5A, 2V	25 @ 1.5A, 2V	63 @ 0.15A, 2V	40 @ 0.15A, 2V	30 @ 0.01A, 5V
Operating Temperature (Max) [°C]	150	150	150	150	150
Package / Case	TO-126-3	TO-126-3	TO-126-3	SOT-32-3	SOT-32-3
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole

Engineering Selection Recommendations

2N5190G (Direct Equivalent): The 2N5190G is the primary equivalent for the obsolete 2N5190. Both parts share identical electrical specifications: 4 A collector current, 40 V breakdown voltage, 40 W power dissipation, 2 MHz transition frequency, and 1.4 V saturation voltage at rated conditions. The 2N5190G maintains active product status with ROHS3 compliance, making it suitable for new production and regulated applications. Mechanical compatibility is assured through identical TO-126-3 packaging. This part is the direct replacement for legacy 2N5190 designs.

BD17510STU (Partial Electrical Compatibility): The BD17510STU provides higher voltage rating (45 V) and improved current gain (63 hFE minimum), but operates at reduced maximum collector current (3 A versus 4 A) and lower power dissipation (30 W versus 40 W). This part is suitable for applications where the 2N5190 operates below 3 A collector current and 30 W power levels. The BD17510STU carries ROHS3 compliance but holds Last Time Buy status, limiting long-term availability. Package compatibility is maintained through TO-126-3 configuration.

BD437 (Partial Electrical Compatibility): The BD437 matches the 2N5190 in collector current (4 A) and approaches power dissipation (36 W versus 40 W), with higher voltage rating (45 V). However, the BD437 uses SOT-32-3 packaging instead of TO-126-3, requiring PCB layout modification. The part carries ROHS3 compliance but holds Not For New Designs status. The BD437 is suitable for legacy maintenance applications where package change is acceptable and current/power requirements remain within specification.

BD135 (Limited Compatibility): The BD135 is not recommended as a direct substitute. Maximum collector current is 1.5 A, significantly below the 2N5190 specification of 4 A. Power dissipation is 1.25 W, insufficient for 40 W applications. Package differs (SOT-32-3 versus TO-126-3). The BD135 is suitable only for applications requiring lower current and power levels than the 2N5190 design envelope.

Compliance Consideration: For new production and regulated markets, the 2N5190G is the only substitute offering both electrical equivalence and active ROHS3 compliance. Legacy applications may use BD17510STU or BD437 where electrical parameters remain within reduced specifications and compliance requirements permit.

Frequently Asked Questions (FAQ)

Q: Can the 2N5190G directly replace the 2N5190 without circuit modification?

A: Yes. The 2N5190G is electrically and mechanically identical to the 2N5190. All electrical parameters, including collector current (4 A), breakdown voltage (40 V), power dissipation (40 W), saturation voltage (1.4 V), and current gain (25 hFE minimum), are matched. Package configuration (TO-126-3) and mounting type (through-hole) are identical. No circuit modification is required.

Q: Why is the 2N5190 classified as obsolete?

A: The 2N5190 has reached end-of-life status with the manufacturer. The 2N5190G serves as the active replacement, offering identical electrical performance with modern RoHS3 compliance. Existing inventory of the 2N5190 remains available (2200 pcs), but new production designs should specify the 2N5190G.

Q: Can BD135 substitute for the 2N5190 in high-current applications?

A: No. The BD135 maximum collector current is 1.5 A, while the 2N5190 is rated for 4 A. The BD135 power dissipation is 1.25 W versus 40 W for the 2N5190. The BD135 is suitable only for applications requiring lower current and power levels than the original 2N5190 design.

Q: What is the impact of using BD437 instead of 2N5190?

A: The BD437 matches collector current (4 A) and approaches power dissipation (36 W). However, the package differs: BD437 uses SOT-32-3 while 2N5190 uses TO-126-3. This requires PCB layout modification and potential thermal management changes. The BD437 carries Not For New Designs status, limiting suitability for new production. Use only in legacy maintenance where package change is acceptable.

Q: Does BD17510STU provide better performance than the 2N5190?

A: The BD17510STU offers higher voltage rating (45 V versus 40 V) and superior current gain (63 hFE minimum versus 25 hFE minimum). However, maximum collector current is reduced to 3 A (versus 4 A) and power dissipation to 30 W (versus 40 W). The BD17510STU is suitable for applications operating below 3 A and 30 W. The part holds Last Time Buy status, limiting future availability.

Q: Are all substitute parts RoHS3 compliant?

A: No. The original 2N5190 is RoHS non-compliant. The 2N5190G, BD17510STU, BD135, and BD437 are all ROHS3 compliant. For regulated applications requiring RoHS compliance, use 2N5190G as the primary choice.

Q: What package considerations apply when selecting a substitute?

A: The 2N5190 and 2N5190G use TO-126-3 through-hole packaging, ensuring direct PCB compatibility. The BD17510STU also uses TO-126-3. The BD135 and BD437 use SOT-32-3 packaging, requiring PCB layout modification. Verify package footprint compatibility with existing designs before substitution.

Q: Can multiple substitute parts be used interchangeably in the same circuit?

A: No. Each substitute part has different electrical specifications. The 2N5190G is the only direct equivalent. BD17510STU, BD135, and BD437 have reduced current, power, or voltage ratings. Select the appropriate substitute based on the specific application's electrical requirements, not interchangeably.

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