BCX19_D87Z Equivalent & Substitute Parts

Part Overview

The BCX19_D87Z is an NPN bipolar junction transistor manufactured by onsemi, rated for 45 V collector-emitter breakdown voltage and 500 mA maximum collector current in a surface mount SOT-23-3 package. This component is classified as obsolete, indicating discontinuation from active production. Identification of equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this transistor topology.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Collector Current (Max)	500	mA
Collector-Emitter Breakdown Voltage (Max)	45	V
Power Dissipation (Max)	300	mW
DC Current Gain (hFE Min) @ Ic, Vce	100 @ 100mA, 1V	—
Vce Saturation (Max) @ Ib, Ic	620mV @ 50mA, 500mA	—
Collector Cutoff Current (Max)	100	nA
Operating Temperature Range	−55 to 150	°C
Package Type	SOT-23-3 (TO-236)	—
Mounting Type	Surface Mount	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the BCX19_D87Z is determined by electrical and mechanical parameter compatibility within the NPN bipolar transistor category. The critical parameters governing substitution are:

Electrical Compatibility Criteria:

Collector current rating: minimum 500 mA
Collector-emitter breakdown voltage: minimum 45 V
Power dissipation: minimum 300 mW
DC current gain (hFE): minimum 100 @ 100mA, 1V
Collector cutoff current: maximum 100 nA
Operating temperature range: minimum −55°C to 150°C

Mechanical Compatibility Criteria:

Package type: SOT-23-3 (TO-236)
Mounting type: Surface Mount
Moisture sensitivity level: 1 (Unlimited)

Substitute parts are classified into two categories:

Direct Substitutes: Parts meeting or exceeding all electrical parameters of the BCX19_D87Z with identical or superior specifications. These parts are pin-compatible and functionally equivalent for direct replacement.

Similar Parts: Parts meeting core electrical parameters but with variations in secondary characteristics such as transition frequency, DC current gain range, or automotive qualification. These parts require design review to confirm suitability for specific application requirements.

Parameter Comparison

Part Number	Manufacturer	Product Status	Ic (Max) mA	Vce(br) (Max) V	Vce Sat (Max) mV	hFE (Min) @ Ic, Vce	Power (Max) mW	Freq Trans MHz	Temp Range °C	Package	RoHS
BCX19_D87Z	onsemi	Obsolete	500	45	620 @ 50mA, 500mA	100 @ 100mA, 1V	300	—	−55 to 150	SOT-23-3	—
BC817-16LT1G	onsemi	Active	500	45	700 @ 50mA, 500mA	100 @ 100mA, 1V	300	100	−65 to 150	SOT-23-3	ROHS3
BCX19LT1G	onsemi	Active	500	45	620 @ 50mA, 500mA	100 @ 100mA, 1V	300	—	−55 to 150	SOT-23-3	ROHS3
SBC817-16LT3G	onsemi	Active	500	45	700 @ 50mA, 500mA	100 @ 100mA, 1V	300	100	−65 to 150	SOT-23-3	ROHS3
SBCX19LT1G	onsemi	Active	500	45	620 @ 50mA, 500mA	100 @ 100mA, 1V	300	—	−55 to 150	SOT-23-3	ROHS3
BC817-16LT3G	onsemi	Active	500	45	700 @ 50mA, 500mA	100 @ 100mA, 1V	300	100	−65 to 150	SOT-23-3	ROHS3
BC817-40LT1G	onsemi	Active	500	45	700 @ 50mA, 500mA	250 @ 100mA, 1V	300	100	−65 to 150	SOT-23-3	ROHS3
BC817-40LT3G	onsemi	Active	500	45	700 @ 50mA, 500mA	250 @ 100mA, 1V	300	100	−65 to 150	SOT-23-3	ROHS3
BC847BLT3G	onsemi	Active	100	45	600 @ 5mA, 100mA	200 @ 2mA, 5V	300	100	−55 to 150	SOT-23-3	ROHS3
BC847CLT1G	onsemi	Active	100	45	600 @ 5mA, 100mA	420 @ 2mA, 5V	300	100	−55 to 150	SOT-23-3	ROHS3
BC847CLT3G	onsemi	Active	100	45	600 @ 5mA, 100mA	420 @ 2mA, 5V	300	100	−55 to 150	SOT-23-3	ROHS3

Engineering Selection Recommendations

Direct Substitutes (Recommended for Pin-Compatible Replacement):

The BCX19LT1G and SBCX19LT1G are direct functional equivalents to the BCX19_D87Z. Both parts maintain identical electrical specifications including 500 mA collector current, 45 V breakdown voltage, 620 mV saturation voltage at rated conditions, and 100 mA minimum DC current gain. Both are active products with ROHS3 compliance and unlimited moisture sensitivity rating. The BCX19LT1G is available in Cut Tape & Digi-Reel packaging, while SBCX19LT1G is supplied in Tape & Reel format with automotive AEC-Q101 qualification.

The BC817-16LT1G and BC817-16LT3G provide electrical equivalence with the addition of 100 MHz transition frequency specification. These parts meet all core electrical requirements and are available in active production status with ROHS3 compliance. The BC817-16LT1G is supplied in Cut Tape & Digi-Reel packaging, while BC817-16LT3G is supplied in Tape & Reel format.

The SBC817-16LT3G is an automotive-qualified variant (AEC-Q101) of the BC817-16LT3G, suitable for applications requiring automotive-grade components.

Similar Parts (Require Design Verification):

The BC817-40LT1G and BC817-40LT3G feature higher DC current gain (250 minimum @ 100mA, 1V) compared to the BCX19_D87Z (100 minimum). These parts are suitable for applications where increased current gain provides design margin or improved performance characteristics.

The BC847BLT3G and BC847CLT1G/BC847CLT3G are not direct substitutes due to reduced maximum collector current (100 mA versus 500 mA). These parts are suitable only for applications with collector current requirements not exceeding 100 mA.

Compliance and Availability:

All recommended substitute parts are manufactured by onsemi and carry ROHS3 compliance certification. The BCX19_D87Z is classified as obsolete; therefore, transition to an active product is necessary for new designs and ongoing production support. BCX19LT1G and SBCX19LT1G maintain the BCX19 base product number and are the preferred direct replacements. BC817 series variants provide additional performance characteristics and are widely available in high inventory quantities.

Frequently Asked Questions (FAQ)

Q: Can BC817-16LT1G be used as a direct replacement for BCX19_D87Z?

A: Yes. The BC817-16LT1G meets all electrical specifications of the BCX19_D87Z, including 500 mA collector current, 45 V breakdown voltage, and 100 mA minimum DC current gain. The addition of 100 MHz transition frequency does not affect compatibility. Both parts use identical SOT-23-3 packaging and surface mount technology.

Q: What is the difference between BCX19LT1G and BC817-16LT1G?

A: Both parts are electrically equivalent to the BCX19_D87Z. The primary difference is that BC817-16LT1G specifies 100 MHz transition frequency, while BCX19LT1G does not specify this parameter. For applications not requiring transition frequency specification, BCX19LT1G provides direct equivalence to the original part number. BC817-16LT1G is suitable when transition frequency performance is required.

Q: Are automotive-qualified versions available?

A: Yes. The SBC817-16LT3G and SBCX19LT1G are automotive-grade variants carrying AEC-Q101 qualification. These parts are suitable for automotive applications requiring qualified component status. Both maintain electrical equivalence to the BCX19_D87Z while meeting automotive qualification requirements.

Q: Can BC847CLT1G replace BCX19_D87Z?

A: No. The BC847CLT1G has a maximum collector current rating of 100 mA, compared to 500 mA for the BCX19_D87Z. This part is suitable only for applications with collector current requirements not exceeding 100 mA. For applications requiring 500 mA collector current capability, BC847 series parts are not suitable.

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in two packaging formats: Cut Tape & Digi-Reel (CT) and Tape & Reel (TR). All parts use SOT-23-3 (TO-236) surface mount package. Selection between packaging formats depends on production volume and assembly process requirements. Cut Tape & Digi-Reel format is suitable for lower-volume applications, while Tape & Reel format is optimized for high-volume automated assembly.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All recommended substitute parts carry ROHS3 compliance certification. The original BCX19_D87Z does not specify RoHS status. All active production alternatives meet current environmental compliance requirements.

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

A: All substitute parts maintain MSL 1 (Unlimited) moisture sensitivity rating, identical to the BCX19_D87Z. This indicates no moisture sensitivity precautions are required during storage, handling, or assembly.

Q: Can BC817-40LT1G be used in place of BCX19_D87Z?

A: Yes, with design consideration. The BC817-40LT1G meets all electrical requirements and provides higher DC current gain (250 minimum versus 100 minimum). The increased current gain may improve circuit performance or provide additional design margin. Electrical verification is recommended to confirm suitability for specific application requirements.

Q: What is the inventory status of substitute parts?

A: BCX19LT1G has 110,100 units in stock. BC817-16LT1G has 305,400 units in stock. BC817-16LT3G has 55,100 units in stock. BC817-40LT1G has 305,000 units in stock. SBCX19LT1G has 3,398 units in stock. All substitute parts are available in active production with established supply chains.

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