BCX71K_D87Z Equivalent & Substitute Parts

Part Overview

The BCX71K_D87Z is a PNP 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 device is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and production continuity. The part operates across a temperature range of -55°C to 150°C and dissipates a maximum of 350 mW. Substitution is required for applications where continued sourcing of the BCX71K_D87Z is not feasible.

Key Parameters

Parameter	BCX71K_D87Z Value	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	45	V
Current - Collector (Ic) (Max)	500	mA
Power - Max	350	mW
Vce Saturation (Max) @ Ib, Ic	550mV @ 1.25mA, 50mA	V
DC Current Gain (hFE) (Min) @ Ic, Vce	380 @ 2mA, 5V	—
Current - Collector Cutoff (Max)	20	nA
Operating Temperature Range	-55 to 150	°C
Package / Case	SOT-23-3 (TO-236-3, SC-59)	—
Mounting Type	Surface Mount	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the BCX71K_D87Z is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor Type: PNP (mandatory match)
Voltage - Collector Emitter Breakdown (Max): 45 V or higher
Current - Collector (Ic) (Max): 500 mA or higher
Package / Case: SOT-23-3 (TO-236-3, SC-59) (mandatory match)
Mounting Type: Surface Mount (mandatory match)
Operating Temperature Range: -55°C to 150°C or compatible subset

Secondary Considerations:

Power dissipation capability (350 mW or higher preferred)
Vce saturation characteristics
DC current gain (hFE) specifications
Product status (active preferred over obsolete)

Substitute parts are grouped into two categories:

Category A - Direct Electrical Equivalents (500 mA, 45 V): Parts meeting or exceeding the primary electrical specifications of the BCX71K_D87Z with identical or superior current and voltage ratings.

Category B - Reduced Current Equivalents (100-200 mA, 45 V or 40 V): Parts with lower maximum collector current but compatible voltage ratings, suitable for applications not requiring full 500 mA capability.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce Breakdown (Max) V	Power (Max) mW	hFE (Min) @ Ic, Vce	Package	Product Status	RoHS / Compliance
BCX71K_D87Z	onsemi	500	45	350	380 @ 2mA, 5V	SOT-23-3	Obsolete	REACH Unaffected
NSVBCX17LT1G	onsemi	500	45	225	100 @ 100mA, 1V	SOT-23-3	Active	ROHS3 / AEC-Q101
2PB710ASL,215	Nexperia USA Inc.	500	50	250	170 @ 150mA, 10V	SOT-23-3	Active	ROHS3 / AEC-Q101
BC807-16,215	Nexperia USA Inc.	500	45	250	100 @ 100mA, 1V	SOT-23-3	Active	ROHS3 / AEC-Q101
BCW68GLT1G	onsemi	800	45	225	120 @ 10mA, 1V	SOT-23-3	Active	ROHS3
MMBT3906LT1G	onsemi	200	40	300	100 @ 10mA, 1V	SOT-23-3	Active	ROHS3
BC857BLT1G	onsemi	100	45	300	220 @ 2mA, 5V	SOT-23-3	Active	ROHS3
BC857CLT1G	onsemi	100	45	300	420 @ 2mA, 5V	SOT-23-3	Active	ROHS3
BCW70LT1G	onsemi	100	45	225	215 @ 2mA, 5V	SOT-23-3	Active	ROHS3
2PB709ART,235	Nexperia USA Inc.	100	45	250	120 @ 2mA, 10V	SOT-23-3	Active	ROHS3 / AEC-Q101
MMBT3906LT3G	onsemi	200	40	300	100 @ 10mA, 1V	SOT-23-3	Active	ROHS3

Engineering Selection Recommendations

For Direct Replacement (500 mA, 45 V Rating):

The NSVBCX17LT1G, 2PB710ASL,215, and BC807-16,215 are the primary active alternatives to the BCX71K_D87Z. All three maintain the 500 mA collector current specification and 45 V (or higher) breakdown voltage in the identical SOT-23-3 package.

NSVBCX17LT1G (onsemi): Active product with AEC-Q101 automotive qualification. Matches the 45 V / 500 mA specification with 225 mW power rating. Suitable for automotive and industrial applications requiring qualification compliance.
2PB710ASL,215 (Nexperia USA Inc.): Active product with AEC-Q101 automotive qualification. Exceeds voltage specification at 50 V with 500 mA current rating and 250 mW power dissipation. Recommended for applications requiring higher voltage margin.
BC807-16,215 (Nexperia USA Inc.): Active product with AEC-Q101 automotive qualification. Matches 45 V / 500 mA specification with 250 mW power rating and 80 MHz transition frequency. Suitable for general-purpose switching applications.

For Reduced Current Applications (100-200 mA):

When application requirements permit lower collector current, the BC857BLT1G, BC857CLT1G, BCW70LT1G, and 2PB709ART,235 provide active alternatives with 45 V ratings in SOT-23-3 packages. These parts offer higher current gain and lower power dissipation.

For Increased Current Capability (800 mA):

The BCW68GLT1G provides 800 mA capability at 45 V in the SOT-23-3 package for applications requiring higher current handling than the original 500 mA specification.

Compliance Considerations:

All recommended active substitutes are ROHS3 compliant and REACH unaffected. Parts designated with AEC-Q101 qualification (NSVBCX17LT1G, 2PB710ASL,215, BC807-16,215, 2PB709ART,235) are suitable for automotive applications. Non-automotive qualified parts (BC857BLT1G, BC857CLT1G, BCW70LT1G, BCW68GLT1G, MMBT3906LT1G, MMBT3906LT3G) are suitable for industrial and consumer applications.

Frequently Asked Questions (FAQ)

Q: Can the BC857BLT1G replace the BCX71K_D87Z in all applications?

A: The BC857BLT1G is a direct package and voltage match (45 V, SOT-23-3) but is limited to 100 mA maximum collector current compared to the BCX71K_D87Z specification of 500 mA. Substitution is valid only for applications where the circuit current requirement does not exceed 100 mA.

Q: What is the primary difference between NSVBCX17LT1G and BC807-16,215?

A: Both parts match the BCX71K_D87Z electrical specification (500 mA, 45 V, SOT-23-3). The NSVBCX17LT1G is manufactured by onsemi with 225 mW power rating, while BC807-16,215 is manufactured by Nexperia with 250 mW power rating and 80 MHz transition frequency. Both carry AEC-Q101 automotive qualification.

Q: Is the 2PB710ASL,215 suitable as a direct replacement?

A: Yes. The 2PB710ASL,215 exceeds the BCX71K_D87Z specification with 50 V breakdown voltage (versus 45 V) and 500 mA current rating in the identical SOT-23-3 package. The higher voltage rating provides additional design margin. AEC-Q101 qualification is included.

Q: Can I use MMBT3906LT1G in place of BCX71K_D87Z?

A: The MMBT3906LT1G is suitable only for applications where collector current does not exceed 200 mA. The voltage rating is 40 V, which is 5 V lower than the BCX71K_D87Z specification of 45 V. Package and mounting type are identical (SOT-23-3, surface mount).

Q: What does AEC-Q101 qualification mean for substitution?

A: AEC-Q101 is an automotive electronics qualification standard. Parts carrying this designation (NSVBCX17LT1G, 2PB710ASL,215, BC807-16,215, 2PB709ART,235) have undergone reliability testing and are approved for automotive applications. Non-qualified parts are suitable for industrial and consumer applications but not automotive.

Q: Why does BCW68GLT1G have lower power rating (225 mW) than BCX71K_D87Z (350 mW) despite higher current capability?

A: Power dissipation is determined by both current and saturation voltage characteristics. The BCW68GLT1G achieves 800 mA capability through optimized transistor design but operates with different saturation voltage characteristics (1.5 V @ 30 mA, 300 mA) compared to the BCX71K_D87Z (550 mV @ 1.25 mA, 50 mA). The lower power rating reflects the typical operating point, not a limitation.

Q: Are all substitute parts available in the same packaging options as BCX71K_D87Z?

A: All listed substitute parts are available in SOT-23-3 surface mount packages. Packaging options (Cut Tape, Tape & Reel, Digi-Reel) vary by manufacturer and part number. Verify specific packaging availability with the supplier for your procurement requirements.

Q: What is the operating temperature range for substitute parts?

A: All substitute parts listed operate across the -55°C to 150°C temperature range, matching the BCX71K_D87Z specification. The 2PB709ART,235 specification indicates 150°C maximum, which is compatible with the full range requirement.

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