2N4919 PNP Bipolar Transistor Equivalent & Substitute Parts

Part Overview

The 2N4919 is an obsolete PNP bipolar junction transistor manufactured by onsemi, rated for 60 V collector-emitter breakdown voltage and 1 A maximum collector current in a TO-126 through-hole package. The device is designed for general-purpose switching and amplification applications with a maximum power dissipation of 30 W and operating temperature range of -65°C to 150°C.

Due to its obsolete product status, locating original 2N4919 components presents supply chain challenges. Equivalent and substitute parts are available from active product lines that maintain electrical and mechanical compatibility within specified parameter tolerances.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	60	V
Current - Collector (Ic) (Max)	1	A
Power - Max	30	W
Vce Saturation (Max) @ Ib, Ic	600mV @ 100mA, 1A	—
DC Current Gain (hFE) (Min) @ Ic, Vce	30 @ 500mA, 1V	—
Frequency - Transition	3	MHz
Operating Temperature	-65 to 150	°C
Mounting Type	Through Hole	—
Package / Case	TO-126-3	—

Substitute Part Grouping Explanation

Substitution of the 2N4919 is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Transistor Type: PNP (required for circuit polarity)
Voltage - Collector Emitter Breakdown: 60 V minimum (electrical stress rating)
Mounting Type: Through Hole (mechanical installation requirement)
Package / Case: TO-126-3 (physical form factor)

Performance Parameters:

Current - Collector (Ic) (Max): 1 A or greater (current handling capacity)
Power - Max: 30 W or greater (thermal dissipation capability)
Operating Temperature: -65°C to 150°C or compatible range (thermal operating window)

Substitute parts are grouped into two categories:

Direct Equivalents: Parts maintaining identical electrical specifications within the 2N4919 parameter envelope (2N4919G).

Functional Substitutes: Parts exceeding 2N4919 specifications in collector current and/or power rating while maintaining voltage rating, package type, and through-hole mounting. These parts are electrically compatible for applications designed around 2N4919 specifications (BD13810STU, BD13816STU, KSB1151YS, KSB1151YSTU).

Parameter Comparison

Part Number	Manufacturer	Ic (Max)	Vce(br)eo	Power (Max)	hFE (Min)	Package	Product Status	RoHS Status
2N4919	onsemi	1 A	60 V	30 W	30 @ 500mA, 1V	TO-126-3	Obsolete	Non-compliant
2N4919G	onsemi	1 A	60 V	30 W	30 @ 500mA, 1V	TO-126-3	Last Time Buy	ROHS3 Compliant
BD13810STU	Fairchild Semiconductor	1.5 A	60 V	1.25 W	63 @ 150mA, 2V	TO-126-3	Active	Not specified
BD13816STU	onsemi	1.5 A	60 V	1.25 W	100 @ 150mA, 2V	TO-126-3	Last Time Buy	ROHS3 Compliant
KSB1151YS	Fairchild Semiconductor	5 A	60 V	1.3 W	100 @ 2A, 1V	TO-126-3	Active	Not specified
KSB1151YSTU	Fairchild Semiconductor	5 A	60 V	1.3 W	160 @ 2A, 1V	TO-126-3	Active	Not specified

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

The 2N4919G is the primary direct equivalent, manufactured by onsemi with identical electrical specifications to the 2N4919. The 2N4919G is ROHS3 compliant and carries Last Time Buy status, indicating continued availability with defined end-of-life timeline. This part is suitable for applications requiring exact parameter matching and is recommended as the first substitution choice.

For Functional Substitution (Enhanced Specifications):

The BD13810STU and BD13816STU are functionally compatible substitutes with 1.5 A collector current rating, exceeding the 2N4919 specification of 1 A. Both maintain the 60 V voltage rating and TO-126-3 package. The BD13816STU is ROHS3 compliant with Last Time Buy status. These parts are suitable for applications where increased current capacity provides design margin without circuit modification.

The KSB1151YS and KSB1151YSTU are functionally compatible substitutes with 5 A collector current rating. Both maintain the 60 V voltage rating and TO-126-3 package and carry Active product status, indicating long-term availability. These parts are suitable for applications requiring significantly higher current capacity or where design flexibility permits use of enhanced specifications.

Compliance Considerations:

For applications requiring RoHS3 compliance, the 2N4919G, BD13816STU, KSB1151YS, and KSB1151YSTU are suitable selections. The 2N4919 original part is RoHS non-compliant and should not be used in new designs subject to RoHS requirements.

Supply Chain Considerations:

Parts with Active product status (BD13810STU, KSB1151YS, KSB1151YSTU) offer the longest supply availability. Parts with Last Time Buy status (2N4919G, BD13816STU) have defined end-of-life dates and should be evaluated for long-term production requirements.

Frequently Asked Questions (FAQ)

Q: Can the 2N4919G be used as a direct replacement for the 2N4919?

A: Yes. The 2N4919G maintains identical electrical specifications including 1 A collector current, 60 V breakdown voltage, 30 W power rating, and TO-126-3 package. The primary differences are product status (Last Time Buy versus Obsolete) and RoHS3 compliance. Electrical performance and circuit behavior are equivalent.

Q: What is the difference between the 2N4919 and BD13810STU?

A: The BD13810STU has a higher maximum collector current rating (1.5 A versus 1 A) and lower maximum power dissipation (1.25 W versus 30 W). Both maintain 60 V breakdown voltage and TO-126-3 package. The BD13810STU is suitable for applications requiring higher current capacity. The lower power rating reflects different thermal design characteristics and does not indicate reduced reliability at equivalent operating points.

Q: Are the KSB1151YS and KSB1151YSTU interchangeable?

A: Both parts are electrically compatible with identical 5 A collector current, 60 V breakdown voltage, and TO-126-3 package. The KSB1151YSTU has a higher minimum DC current gain (160 versus 100 at 2A, 1V). Both carry Active product status. Selection between these parts depends on specific circuit gain requirements and supplier availability.

Q: Can I use a substitute part with higher current rating in place of the 2N4919?

A: Yes, provided the circuit design does not depend on the 2N4919 current limitation for circuit operation. Parts with higher current ratings (BD13810STU at 1.5 A, KSB1151YS/KSB1151YSTU at 5 A) are electrically compatible for applications designed around the 2N4919 1 A specification. The higher current rating provides design margin and does not create circuit incompatibility.

Q: What is the significance of the TO-126-3 package designation?

A: The TO-126-3 package is a three-lead through-hole component with standardized pin configuration and physical dimensions. All listed substitute parts use this identical package, ensuring mechanical compatibility with existing printed circuit board layouts and component mounting equipment. No board redesign is required when substituting between parts with TO-126-3 package designation.

Q: Why do some substitute parts have lower power ratings than the 2N4919?

A: The BD13810STU, BD13816STU, KSB1151YS, and KSB1151YSTU have lower maximum power dissipation ratings (1.25 W or 1.3 W) compared to the 2N4919 (30 W). This reflects different thermal design and package thermal characteristics, not reduced device reliability. These parts are suitable for applications operating within their specified power envelope. Applications requiring sustained 30 W dissipation should use the 2N4919G or evaluate thermal management requirements for substitute parts.

Q: Is RoHS compliance required for my application?

A: RoHS compliance requirements depend on application jurisdiction and customer specifications. For applications subject to RoHS3 requirements, the 2N4919G, BD13816STU, KSB1151YS, and KSB1151YSTU are compliant options. The original 2N4919 is RoHS non-compliant and should not be used in new designs requiring RoHS certification.

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