2SD1819ASL Equivalent & Substitute Parts

Part Overview

The 2SD1819ASL is an NPN bipolar junction transistor manufactured by Panasonic Electronic Components in the SMini3-G1 surface mount package. This device is rated for 50 V collector-emitter breakdown voltage with a maximum collector current of 100 mA and operates at frequencies up to 150 MHz. The part is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility within the specified parameter ranges while accommodating modern manufacturing and supply chain availability.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	50	V
Current - Collector (Ic) (Max)	100	mA
Vce Saturation (Max) @ Ib, Ic	300 mV @ 10 mA, 100 mA	—
DC Current Gain (hFE) (Min) @ Ic, Vce	290 @ 2 mA, 10 V	—
Power - Max	150	mW
Frequency - Transition	150	MHz
Operating Temperature (TJ)	150	°C
Mounting Type	Surface Mount	—
Package / Case	SC-70, SOT-323	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the 2SD1819ASL is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

Transistor type must be NPN
Collector-emitter breakdown voltage must be greater than or equal to 50 V
Maximum collector current must be greater than or equal to 100 mA
DC current gain (hFE) must support the application requirements
Transition frequency must support the operating frequency range
Power dissipation capability must be adequate for the application

Mechanical Compatibility Criteria:

Surface mount packaging in SC-70 or SOT-323 footprint
Moisture sensitivity level of 1 (Unlimited) or equivalent

Substitution Categories:

Direct Substitutes (Electrical Equivalence with Enhanced Specifications): Parts that meet or exceed all electrical parameters of the 2SD1819ASL while maintaining package compatibility. These include the 2PD601ASW,115 from NXP USA Inc., which provides 50 V breakdown voltage, 100 mA collector current, and enhanced saturation characteristics.

Compatible Alternatives (Reduced Voltage Rating with Full Current Capability): Parts rated at 45 V collector-emitter breakdown voltage with 100 mA collector current capability. These include BC847 and BC850 series devices from multiple manufacturers. While the voltage rating is reduced by 5 V, these parts remain suitable for applications where the 2SD1819ASL operates below 45 V. This category includes BC847AW RFG, BC847AW,115, BC847AWT1G, BC847BW-TP, BC847CW,115, BC847CWT3G, BC850AW RFG, BC850BW,135, and BC850CW,115.

Parameter Comparison

Parameter	2SD1819ASL	2PD601ASW,115	BC847AW RFG	BC847AW,115	BC847AWT1G	BC847BW-TP	BC847CW,115	BC847CWT3G	BC850AW RFG	BC850BW,135	BC850CW,115
Manufacturer	Panasonic	NXP USA Inc.	Taiwan Semiconductor	NXP Semiconductors	onsemi	Micro Commercial Co	Nexperia USA Inc.	onsemi	Taiwan Semiconductor	Nexperia USA Inc.	Nexperia USA Inc.
Transistor Type	NPN	NPN	NPN	NPN	NPN	NPN	NPN	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	50 V	50 V	45 V	45 V	45 V	45 V	45 V	45 V	45 V	45 V	45 V
Current - Collector (Ic) (Max)	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA
Vce Saturation (Max) @ Ib, Ic	300 mV @ 10 mA, 100 mA	250 mV @ 10 mA, 100 mA	600 mV @ 5 mA, 100 mA	400 mV @ 5 mA, 100 mA	600 mV @ 5 mA, 100 mA	600 mV @ 5 mA, 100 mA	400 mV @ 5 mA, 100 mA	600 mV @ 5 mA, 100 mA	600 mV @ 5 mA, 100 mA	600 mV @ 5 mA, 100 mA	600 mV @ 5 mA, 100 mA
DC Current Gain (hFE) (Min) @ Ic, Vce	290 @ 2 mA, 10 V	290 @ 2 mA, 10 V	110 @ 2 mA, 5 V	110 @ 2 mA, 5 V	110 @ 2 mA, 5 V	200 @ 2 mA, 5 V	420 @ 2 mA, 5 V	420 @ 2 mA, 5 V	110 @ 2 mA, 5 V	200 @ 2 mA, 5 V	420 @ 2 mA, 5 V
Power - Max	150 mW	200 mW	200 mW	200 mW	150 mW	—	200 mW	150 mW	200 mW	200 mW	200 mW
Frequency - Transition	150 MHz	100 MHz	100 MHz	100 MHz	100 MHz	100 MHz	100 MHz	100 MHz	100 MHz	100 MHz	100 MHz
Operating Temperature (TJ)	150°C	150°C	-55°C ~ 150°C	150°C	-55°C ~ 150°C	-65°C ~ 150°C	150°C	-55°C ~ 150°C	-55°C ~ 150°C	150°C	150°C
Package / Case	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Direct Substitute:

The 2PD601ASW,115 from NXP USA Inc. is the primary direct substitute for the 2SD1819ASL. This part maintains the 50 V collector-emitter breakdown voltage specification and 100 mA collector current rating. The 2PD601ASW,115 provides improved saturation characteristics (250 mV versus 300 mV) and enhanced power dissipation capability (200 mW versus 150 mW). The part is active in production status and carries AEC-Q101 automotive qualification, ensuring long-term availability and supply chain stability. The identical DC current gain specification (290 @ 2 mA, 10 V) ensures direct functional equivalence in gain-dependent applications.

Secondary Compatible Alternatives:

For applications where the 50 V breakdown voltage specification is not critical and operation is confirmed below 45 V, the BC847 and BC850 series devices from multiple manufacturers provide active, readily available alternatives. These parts are manufactured by NXP Semiconductors, Nexperia USA Inc., onsemi, Taiwan Semiconductor Corporation, and Micro Commercial Co, ensuring supply chain diversity.

BC847 Series Selection:

BC847AW RFG, BC847AW,115, BC847AWT1G: Lower gain variant (110 @ 2 mA, 5 V) suitable for general-purpose switching applications
BC847BW-TP: Mid-range gain variant (200 @ 2 mA, 5 V) with extended temperature range (-65°C to 150°C)
BC847CW,115, BC847CWT3G: Higher gain variant (420 @ 2 mA, 5 V) for applications requiring increased current amplification

BC850 Series Selection:

BC850AW RFG: Lower gain variant (110 @ 2 mA, 5 V) with extended temperature range (-55°C to 150°C)
BC850BW,135: Mid-range gain variant (200 @ 2 mA, 5 V) with AEC-Q101 automotive qualification
BC850CW,115: Higher gain variant (420 @ 2 mA, 5 V) with AEC-Q101 automotive qualification

Compliance and Qualification:

Multiple substitute parts carry AEC-Q101 automotive qualification (2PD601ASW,115, BC847AW,115, BC850BW,135, BC850CW,115), ensuring suitability for automotive and industrial applications requiring enhanced reliability standards. All listed substitutes maintain RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity ratings, supporting modern manufacturing and storage requirements.

Frequency Consideration:

The 2SD1819ASL operates at 150 MHz transition frequency, while all substitute parts operate at 100 MHz. For applications operating above 100 MHz, the 2SD1819ASL specifications must be retained. For applications operating at or below 100 MHz, substitute parts provide full functional compatibility.

Frequently Asked Questions (FAQ)

Q: Can the 2PD601ASW,115 directly replace the 2SD1819ASL in all applications?

A: The 2PD601ASW,115 provides direct electrical substitution for the 2SD1819ASL with identical voltage and current ratings, matching DC current gain specifications, and improved saturation characteristics. Both parts use the SC-70/SOT-323 surface mount package. The primary design consideration is transition frequency: the 2SD1819ASL operates at 150 MHz while the 2PD601ASW,115 operates at 100 MHz. Direct substitution is valid for applications operating at or below 100 MHz.

Q: What is the difference between BC847 and BC850 series devices?

A: The BC847 and BC850 series are both NPN small-signal transistors in the SC-70/SOT-323 package with identical voltage and current ratings. The primary distinction is DC current gain classification: BC847 devices are available in A, B, and C gain grades (110, 200, and 420 respectively), while BC850 devices follow the same gain classification. Selection between series depends on application gain requirements and manufacturer availability. Both series are functionally equivalent when matched by gain grade.

Q: Why do substitute parts show 45 V breakdown voltage instead of 50 V?

A: The BC847 and BC850 series devices are rated for 45 V collector-emitter breakdown voltage, which is 5 V lower than the 2SD1819ASL specification. These parts remain suitable for applications where the actual operating voltage does not exceed 45 V. For applications requiring the full 50 V rating, the 2PD601ASW,115 maintains the 50 V specification. Circuit design review is necessary to confirm that operating voltages remain within the 45 V limit when using BC847 or BC850 substitutes.

Q: Are all substitute parts available in the same packaging?

A: All listed substitute parts use the SC-70 or SOT-323 surface mount package, which is physically and electrically compatible with the 2SD1819ASL SMini3-G1 package. Printed circuit board layouts and reflow profiles require no modification for package substitution. Verify specific supplier device package designations (SOT-323 versus SC-70-3) with component datasheets, as some manufacturers use alternative nomenclature for the same physical package.

Q: What is the significance of AEC-Q101 qualification on substitute parts?

A: AEC-Q101 qualification indicates that a component meets automotive industry reliability and quality standards established by the Automotive Electronics Council. Parts carrying this qualification (2PD601ASW,115, BC847AW,115, BC850BW,135, BC850CW,115) are suitable for automotive applications and applications requiring enhanced reliability assurance. Non-qualified parts remain suitable for general industrial and consumer applications.

Q: How do DC current gain differences affect circuit performance?

A: DC current gain (hFE) determines the base current required to achieve a specified collector current. The 2SD1819ASL specifies 290 hFE @ 2 mA, 10 V. Substitute parts vary: BC847A/BC850A variants provide 110 hFE, BC847B/BC850B variants provide 200 hFE, and BC847C/BC850C variants provide 420 hFE. For circuits designed around the original 290 hFE specification, BC847B or BC850B variants (200 hFE) provide the closest match. Higher gain variants (C grade) reduce base current requirements, while lower gain variants (A grade) increase base current requirements. Circuit bias networks may require adjustment when substituting between gain grades.

Q: What temperature range considerations apply to substitute selection?

A: The 2SD1819ASL specifies maximum junction temperature of 150°C. Most substitute parts also specify 150°C maximum. However, some variants provide extended operating temperature ranges: BC847AWT1G, BC847BW-TP, and BC847CWT3G operate from -55°C to 150°C or -65°C to 150°C. For applications requiring operation below 0°C, these extended-range variants provide enhanced performance. Standard variants operating from 0°C to 150°C are suitable for most industrial applications.

Q: Can substitute parts be mixed within a single design?

A: All listed substitute parts maintain identical voltage and current specifications and use compatible packaging. However, mixing parts with different DC current gain grades (A, B, C variants) within a single design may result in circuit performance variations due to hFE differences. For designs requiring consistent performance across multiple units, maintain consistent gain grade selection. Designs using automatic gain control or feedback compensation tolerate gain variations more readily than open-loop amplifier configurations.

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