BCX71J_D87Z Equivalent & Substitute Parts

Part Overview

The BCX71J_D87Z is a PNP bipolar junction transistor manufactured by onsemi, rated for 45 V collector-emitter breakdown voltage and 100 mA maximum collector current in a surface mount SOT-23-3 package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement needs. Substitute parts must maintain electrical compatibility within the specified parameter ranges while offering active product status and improved availability.

Key Parameters

Parameter	BCX71J_D87Z	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	45	V
Current - Collector (Ic) (Max)	100	mA
Power - Max	350	mW
Vce Saturation (Max) @ Ib, Ic	550mV @ 1.25mA, 50mA	V
DC Current Gain (hFE) (Min) @ Ic, Vce	250 @ 2mA, 5V	—
Current - Collector Cutoff (Max)	20	nA
Package / Case	SOT-23-3 (TO-236-3, SC-59)	—
Mounting Type	Surface Mount	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitute parts are grouped based on strict electrical parameter compatibility with the BCX71J_D87Z. The primary substitution criteria are:

Critical Parameters (Must Match or Exceed):

Transistor Type: PNP
Voltage - Collector Emitter Breakdown (Max): ≥ 45 V
Current - Collector (Ic) (Max): ≥ 100 mA
Package / Case: SOT-23-3 (TO-236-3, SC-59)
Mounting Type: Surface Mount

Secondary Parameters (Acceptable Variation):

Power - Max: ≥ 225 mW (minimum acceptable for thermal performance)
Vce Saturation: Comparable saturation characteristics
DC Current Gain (hFE): Minimum 100 at specified test conditions

Preferred Characteristics:

Product Status: Active (ensures ongoing availability)
RoHS Compliance: ROHS3 Compliant
Operating Temperature Range: -55°C to 150°C

Parts are classified into two categories: Direct Equivalents (matching all critical parameters with active status) and Functional Substitutes (meeting electrical requirements with potential parameter variations).

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce Breakdown (Max) V	Power (Max) mW	hFE (Min)	Package	Status	RoHS
BCX71J_D87Z	onsemi	100	45	350	250 @ 2mA, 5V	SOT-23-3	Obsolete	—
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
NSVBC857BLT3G	onsemi	100	45	225	220 @ 2mA, 5V	SOT-23-3	Active	ROHS3
BCX71J,215	Nexperia USA Inc.	100	45	250	250 @ 2mA, 5V	SOT-23-3	Active	ROHS3
2PB709ARL,215	Nexperia USA Inc.	100	45	250	210 @ 2mA, 10V	SOT-23-3	Active	ROHS3
2PB709ARL,235	Nexperia USA Inc.	100	45	250	210 @ 2mA, 10V	SOT-23-3	Active	ROHS3
BC807-16LT1G	onsemi	500	45	300	100 @ 100mA, 1V	SOT-23-3	Active	ROHS3
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
MMBT3906LT3G	onsemi	200	40	300	100 @ 10mA, 1V	SOT-23-3	Active	ROHS3

Engineering Selection Recommendations

Direct Equivalent (Recommended Primary Substitutes):

The BCX71J,215 manufactured by Nexperia USA Inc. is the direct equivalent replacement. It maintains identical electrical specifications to the BCX71J_D87Z, including 100 mA maximum collector current, 45 V breakdown voltage, and 250 mA DC current gain minimum at 2 mA and 5 V. This part carries active product status, ROHS3 compliance, and AEC-Q101 automotive qualification, ensuring long-term availability and regulatory compliance.

Primary Functional Substitutes (Matching Critical Parameters):

BC857CLT1G (onsemi) provides the closest electrical match among active onsemi alternatives. It matches the 100 mA collector current and 45 V breakdown voltage specifications. The higher DC current gain (420 @ 2mA, 5V) and 100 MHz transition frequency provide enhanced performance characteristics. Product status is active with ROHS3 compliance.

BCW70LT1G (onsemi) meets all critical electrical requirements with 100 mA collector current and 45 V breakdown voltage. The lower power rating (225 mW) remains acceptable for applications within the original 350 mW specification. Active product status and ROHS3 compliance are confirmed.

NSVBC857BLT3G (onsemi) offers equivalent electrical performance with 100 mA collector current, 45 V breakdown voltage, and comparable DC current gain (220 @ 2mA, 5V). Active status and ROHS3 compliance are confirmed.

2PB709ARL,215 and 2PB709ARL,235 (Nexperia USA Inc.) maintain the critical 100 mA and 45 V specifications with automotive-grade qualification (AEC-Q101). These parts are suitable for applications requiring automotive-level reliability.

Secondary Substitutes (Higher Current Capability):

BC807-16LT1G (onsemi) and BCW68GLT1G (onsemi) exceed the original 100 mA specification with 500 mA and 800 mA ratings respectively. These parts are suitable for applications requiring higher current capacity while maintaining the 45 V breakdown voltage and SOT-23-3 package compatibility. Both carry active status and ROHS3 compliance.

Not Recommended:

MMBT3906LT1G and MMBT3906LT3G (onsemi) have a reduced breakdown voltage specification of 40 V, which falls below the required 45 V minimum. These parts are not suitable for direct substitution in applications requiring the full 45 V rating.

Frequently Asked Questions (FAQ)

Q: Can BC857CLT1G directly replace BCX71J_D87Z in all applications?

A: BC857CLT1G meets all critical electrical parameters: 100 mA maximum collector current, 45 V breakdown voltage, and SOT-23-3 package. The higher DC current gain (420 vs. 250) and 100 MHz transition frequency represent performance improvements. Substitution is valid for applications within these specifications. Verify circuit design does not depend on the lower gain characteristics of the original part.

Q: What is the difference between BCX71J,215 and BCX71J_D87Z?

A: BCX71J,215 is the active equivalent manufactured by Nexperia USA Inc. Both parts share identical electrical specifications: 100 mA collector current, 45 V breakdown voltage, 250 mA DC current gain minimum, and SOT-23-3 package. The primary difference is product status: BCX71J_D87Z is obsolete, while BCX71J,215 is active with confirmed long-term availability and ROHS3 compliance.

Q: Can I use MMBT3906 as a substitute?

A: MMBT3906 variants (MMBT3906LT1G, MMBT3906LT3G) have a maximum breakdown voltage of 40 V, which is below the required 45 V specification. These parts are not suitable for direct substitution. Use only if your application operates at voltages below 40 V.

Q: What is the significance of the SOT-23-3 package compatibility?

A: All recommended substitutes use the SOT-23-3 (TO-236-3, SC-59) package, ensuring mechanical and electrical compatibility with existing PCB layouts and footprints. No redesign or rework is required for package-level integration.

Q: Are there differences between onsemi and Nexperia versions?

A: Both manufacturers produce equivalent parts meeting the same electrical specifications. Nexperia parts (BCX71J,215 and 2PB709ARL variants) carry AEC-Q101 automotive qualification, making them suitable for automotive applications. onsemi parts (BC857CLT1G, BCW70LT1G, NSVBC857BLT3G) are suitable for general industrial and consumer applications. Selection depends on application requirements and qualification standards.

Q: Why do some substitutes have higher current ratings (BC807-16LT1G at 500 mA, BCW68GLT1G at 800 mA)?

A: Higher current-rated parts maintain the 45 V breakdown voltage and SOT-23-3 package while providing increased collector current capacity. These parts are suitable for applications requiring higher current handling. Verify that circuit design does not depend on the lower current characteristics of the original 100 mA part.

Q: What does "Active" product status mean for substitution purposes?

A: Active product status indicates the manufacturer maintains ongoing production, quality control, and long-term availability. Obsolete parts like BCX71J_D87Z have discontinued production and limited remaining inventory. Substituting with active parts ensures reliable procurement for current and future production runs.

Q: Are all recommended substitutes RoHS compliant?

A: All recommended active substitutes carry ROHS3 compliance certification, meeting European Union Restriction of Hazardous Substances regulations. This compliance is mandatory for most commercial and industrial applications.

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