2SD1819AQL Equivalent & Substitute Parts

Part Overview

The 2SD1819AQL is an NPN bipolar junction transistor manufactured by Panasonic Electronic Components, designed for general-purpose switching and amplification applications. This device features a 50 V collector-emitter breakdown voltage, 100 mA maximum collector current, and 150 MHz transition frequency in a surface mount SMini3-G1 package (SC-70, SOT-323).

The 2SD1819AQL is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure component availability, and support ongoing production requirements. Substitute devices must maintain electrical compatibility within the specified parameter ranges while accommodating modern active component availability.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	50	V
Current - Collector (Ic) (Max)	100	mA
Power - Max	150	mW
Frequency - Transition	150	MHz
Vce Saturation (Max) @ Ib, Ic	300mV @ 10mA, 100mA	—
DC Current Gain (hFE) (Min) @ Ic, Vce	160 @ 2mA, 10V	—
Current - Collector Cutoff (Max)	100	µA
Operating Temperature (Max)	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 2SD1819AQL is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

Transistor Type: NPN configuration required
Voltage Rating: Collector-emitter breakdown voltage must be equal to or greater than 50 V
Current Rating: Maximum collector current must be equal to or greater than 100 mA
Power Dissipation: Maximum power rating must be equal to or greater than 150 mW
Frequency Response: Transition frequency must support the application requirements
Saturation Characteristics: Vce saturation and DC current gain must be compatible with circuit design

Mechanical Compatibility Criteria:

Package Type: Surface mount SC-70 or SOT-323 package required
Mounting Type: Surface mount configuration
Moisture Sensitivity: MSL 1 (Unlimited) preferred for handling compatibility

All substitute parts listed maintain NPN configuration and surface mount packaging. However, substitute devices operate at reduced voltage ratings (45 V maximum) compared to the original 2SD1819AQL (50 V maximum). This voltage reduction is acceptable for applications where the circuit design margin permits operation below 50 V. Substitute parts provide equal or superior current handling, power dissipation, and frequency response characteristics.

Parameter Comparison

Parameter	2SD1819AQL (Main)	BC847AW RFG	BC847AW-7-F	BC847AWT1G	BC847BW-TP	BC847CW,115	BC850AW RFG	BC850CW,115	SBC847CWT1G
Manufacturer	Panasonic	Taiwan Semiconductor	Diodes Incorporated	onsemi	Micro Commercial Co	Nexperia USA Inc.	Taiwan Semiconductor	Nexperia USA Inc.	onsemi
Transistor Type	NPN	NPN	NPN	NPN	NPN	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	50 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
Power - Max	150 mW	200 mW	200 mW	150 mW	—	200 mW	200 mW	200 mW	150 mW
Frequency - Transition	150 MHz	100 MHz	300 MHz	100 MHz	100 MHz	100 MHz	100 MHz	100 MHz	100 MHz
Vce Saturation (Max) @ Ib, Ic	300mV @ 10mA, 100mA	600mV @ 5mA, 100mA	600mV @ 5mA, 100mA	600mV @ 5mA, 100mA	600mV @ 5mA, 100mA	400mV @ 5mA, 100mA	600mV @ 5mA, 100mA	600mV @ 5mA, 100mA	600mV @ 5mA, 100mA
DC Current Gain (hFE) (Min) @ Ic, Vce	160 @ 2mA, 10V	110 @ 2mA, 5V	110 @ 2mA, 5V	110 @ 2mA, 5V	200 @ 2mA, 5V	420 @ 2mA, 5V	110 @ 2mA, 5V	420 @ 2mA, 5V	420 @ 2mA, 5V
Current - Collector Cutoff (Max)	100 µA	100 nA	20 nA	15 nA	100 nA	15 nA	100 nA	15 nA	15 nA
Operating Temperature (Max)	150°C	150°C	150°C	150°C	150°C	150°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
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Automotive Grade	—	—	—	—	—	—	—	AEC-Q101	AEC-Q101

Engineering Selection Recommendations

General-Purpose Applications: BC847AW RFG, BC847AW-7-F, BC847AWT1G, BC847BW-TP, BC847CW,115, BC850AW RFG, and BC850CW,115 are suitable for general-purpose switching and amplification applications. All substitute parts are active products with ROHS3 compliance, ensuring long-term availability and environmental regulatory adherence.

High-Frequency Applications: BC847AW-7-F provides the highest transition frequency at 300 MHz, exceeding the original 2SD1819AQL specification of 150 MHz. This device is appropriate for applications requiring enhanced frequency response.

Automotive Applications: BC850CW,115 and SBC847CWT1G carry AEC-Q101 automotive qualification. These devices are suitable for automotive-grade circuit designs requiring formal qualification documentation.

Power Dissipation Considerations: BC847AWT1G and SBC847CWT1G maintain the original 150 mW power rating. All other substitute parts provide 200 mW maximum power dissipation, offering increased thermal margin.

Voltage Margin Applications: All substitute parts operate at 45 V maximum collector-emitter breakdown voltage, which is 5 V lower than the original 2SD1819AQL (50 V). Circuit designs must accommodate this reduced voltage rating. Applications requiring the full 50 V rating cannot use these substitutes.

Current Gain Characteristics: BC847CW,115 and BC850CW,115 provide significantly higher DC current gain (420 minimum) compared to the original device (160 minimum). BC847BW-TP also provides elevated gain (200 minimum). Applications sensitive to current gain variation require evaluation of circuit performance with these higher values.

Frequently Asked Questions (FAQ)

Q: Can the 2SD1819AQL be directly replaced with any of the listed substitute parts?

A: Direct replacement is possible for applications where the circuit design operates below 45 V collector-emitter voltage. The substitute parts maintain identical NPN configuration, 100 mA current rating, and SC-70/SOT-323 package compatibility. However, applications requiring the full 50 V rating of the original device cannot use these substitutes.

Q: What is the primary difference between the 2SD1819AQL and the substitute parts?

A: The primary difference is the collector-emitter breakdown voltage rating. The 2SD1819AQL is rated at 50 V maximum, while all substitute parts are rated at 45 V maximum. All other electrical parameters (current, power, frequency, saturation characteristics) are compatible or superior.

Q: Are there differences in DC current gain among the substitute parts?

A: Yes. BC847AW RFG, BC847AW-7-F, BC847AWT1G, and BC850AW RFG provide 110 minimum DC current gain. BC847BW-TP provides 200 minimum. BC847CW,115, BC850CW,115, and SBC847CWT1G provide 420 minimum. Circuit designs must account for these variations in gain characteristics.

Q: Which substitute part offers the highest transition frequency?

A: BC847AW-7-F provides 300 MHz transition frequency, which exceeds the original 2SD1819AQL specification of 150 MHz. All other substitute parts provide 100 MHz transition frequency.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts are ROHS3 compliant, meeting current environmental regulatory requirements.

Q: Which substitute parts carry automotive qualification?

A: BC850CW,115 and SBC847CWT1G carry AEC-Q101 automotive qualification. These devices are suitable for automotive-grade applications requiring formal qualification documentation.

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

A: BC847 and BC850 series devices are both NPN transistors with identical electrical ratings in the substitute list. The primary distinction is the base product number designation. Both series are suitable for general-purpose applications.

Q: Can the substitute parts be used in the same PCB footprint as the 2SD1819AQL?

A: Yes. All substitute parts use the SC-70 or SOT-323 package, which maintains identical PCB footprint compatibility with the original 2SD1819AQL SMini3-G1 package.

Q: What is the moisture sensitivity level of the substitute parts?

A: All substitute parts maintain MSL 1 (Unlimited) moisture sensitivity level, identical to the original 2SD1819AQL, ensuring compatible handling and storage requirements.

Q: Which substitute part most closely matches the original 2SD1819AQL specifications?

A: BC847AWT1G and SBC847CWT1G most closely match the original specifications, maintaining the 150 mW power rating and 100 MHz transition frequency. Both devices are active products with full compliance documentation.

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