MMBTA14_D87Z Equivalent & Substitute Parts

Part Overview

The MMBTA14_D87Z is an NPN Darlington bipolar junction transistor manufactured by onsemi, designed for surface mount applications in the SOT-23-3 package. This component operates at a maximum collector current of 1.2 A and collector-emitter breakdown voltage of 30 V, with a maximum power dissipation of 350 mW. 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 offering active product status and current availability.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN - Darlington	—
Current - Collector (Ic) (Max)	1.2	A
Voltage - Collector Emitter Breakdown (Max)	30	V
Vce Saturation (Max) @ Ib, Ic	1.5V @ 100µA, 100mA	—
Current - Collector Cutoff (Max)	100nA	ICBO
DC Current Gain (hFE) (Min) @ Ic, Vce	20000 @ 100mA, 5V	—
Power - Max	350	mW
Frequency - Transition	125	MHz
Operating Temperature	-55 to 150	°C (TJ)
Mounting Type	Surface Mount	—
Package / Case	SOT-23-3	—

Substitute Part Grouping Explanation

Substitution of the MMBTA14_D87Z is determined by strict adherence to the following electrical and mechanical parameters:

Critical Parameters for Direct Substitution:

Transistor Type: NPN - Darlington configuration
Current - Collector (Ic) (Max): 1.2 A minimum
Voltage - Collector Emitter Breakdown (Max): 30 V minimum
Package / Case: SOT-23-3 (TO-236-3, SC-59)
Mounting Type: Surface Mount
Operating Temperature Range: -55°C to 150°C (TJ)

Parameters Allowing Variation:

Frequency - Transition: May exceed 125 MHz
Vce Saturation: May be lower than 1.5V
Power - Max: May exceed 350 mW
DC Current Gain (hFE): May exceed 20000

Parts are classified into two categories:

Direct Equivalents: Parts meeting or exceeding all critical parameters with identical or superior electrical characteristics and active product status.
Functional Substitutes: Parts with reduced current rating (below 1.2 A) or other parameter variations that require circuit design verification but maintain core Darlington functionality and package compatibility.

Parameter Comparison

Part Number	Manufacturer	Product Status	Ic (Max) A	Vce(br) V	Vce Sat (Max) V	hFE (Min)	Power (Max) mW	Freq (MHz)	Package	RoHS
MMBTA14_D87Z	onsemi	Obsolete	1.2	30	1.5	20000	350	125	SOT-23-3	—
BCV27	onsemi	Active	1.2	30	1.0	20000	350	220	SOT-23-3	ROHS3
MMBTA13LT1G	onsemi	Active	0.3	30	1.5	10000	225	125	SOT-23-3	ROHS3
MMBTA13LT3G	onsemi	Active	0.3	30	1.5	10000	225	125	SOT-23-3	ROHS3
MMBTA14LT1G	onsemi	Active	0.3	30	1.5	20000	225	125	SOT-23-3	ROHS3
SMMBTA14LT1G	onsemi	Active	0.3	30	1.5	20000	225	125	SOT-23-3	ROHS3
SMMBTA14LT3G	onsemi	Active	0.3	30	1.5	20000	225	125	SOT-23-3	ROHS3
2SD1383KT146B	Rohm Semiconductor	Active	0.3	32	1.5	5000	200	250	SOT-23-3	ROHS3
2SD2142KT146	Rohm Semiconductor	Active	0.3	30	1.5	10000	200	200	SOT-23-3	ROHS3
BCV27,215	Nexperia USA Inc.	Active	0.5	30	1.0	20000	250	220	SOT-23-3	ROHS3
MMBTA14-7-F	Diodes Incorporated	Active	0.3	30	1.5	20000	300	125	SOT-23-3	ROHS3

Engineering Selection Recommendations

Direct Equivalent (Full Current Rating Maintained):

BCV27 is the primary direct equivalent for MMBTA14_D87Z. This part maintains the 1.2 A maximum collector current specification, 30 V collector-emitter breakdown voltage, and SOT-23-3 package compatibility. BCV27 offers active product status with ROHS3 compliance and improved transition frequency (220 MHz versus 125 MHz), providing superior high-frequency performance. The lower saturation voltage (1.0 V versus 1.5 V) represents an electrical improvement. This part is suitable for direct substitution in existing designs without circuit modification.

Functional Substitutes (Reduced Current Rating):

The following parts operate at reduced maximum collector current (0.3 A or 0.5 A) and are classified as functional substitutes:

MMBTA14LT1G, SMMBTA14LT1G, SMMBTA14LT3G: These onsemi parts maintain the 20000 hFE minimum gain specification and 30 V breakdown voltage with active product status and ROHS3 compliance. Current rating reduction to 0.3 A requires circuit design verification.
MMBTA13LT1G, MMBTA13LT3G: onsemi parts with 0.3 A current rating and 10000 hFE minimum gain. Suitable for applications with lower current requirements.
2SD2142KT146: Rohm Semiconductor part with 0.3 A current rating, 30 V breakdown voltage, and active status. Maintains 10000 hFE minimum gain.
2SD1383KT146B: Rohm Semiconductor part with 0.3 A current rating and 32 V breakdown voltage, offering slightly higher voltage margin. Transition frequency of 250 MHz exceeds original specification.
BCV27,215: Nexperia part with 0.5 A current rating, maintaining 30 V breakdown voltage and 20000 hFE gain. Automotive-qualified (AEC-Q101) with active status.
MMBTA14-7-F: Diodes Incorporated part with 0.3 A current rating, automotive qualification (AEC-Q101), and active status. Maintains 20000 hFE gain and 30 V breakdown voltage.

All substitute parts feature active product status and ROHS3 compliance, ensuring long-term availability and regulatory compliance for new designs.

Frequently Asked Questions (FAQ)

Q: Can BCV27 be used as a direct replacement for MMBTA14_D87Z?

A: Yes. BCV27 maintains the critical electrical parameters: 1.2 A maximum collector current, 30 V collector-emitter breakdown voltage, SOT-23-3 package, and -55°C to 150°C operating temperature range. BCV27 offers active product status and ROHS3 compliance, making it suitable for direct substitution.

Q: What is the primary difference between BCV27 and MMBTA14_D87Z?

A: The primary differences are product status (BCV27 is active versus MMBTA14_D87Z obsolete), transition frequency (220 MHz versus 125 MHz), and saturation voltage (1.0 V versus 1.5 V). These represent electrical improvements in the substitute part.

Q: Can parts with 0.3 A current rating replace the 1.2 A MMBTA14_D87Z?

A: Parts with 0.3 A current rating (MMBTA14LT1G, MMBTA13LT1G, 2SD2142KT146, MMBTA14-7-F, and others) are functional substitutes only for applications where the circuit design operates at or below 0.3 A collector current. These parts are not suitable for applications requiring the full 1.2 A capability without circuit redesign.

Q: Are all substitute parts RoHS compliant?

A: All active substitute parts listed are ROHS3 compliant. The original MMBTA14_D87Z does not specify RoHS status due to its obsolete classification.

Q: What is the difference between MMBTA14LT1G and MMBTA13LT1G?

A: Both parts are onsemi products with 0.3 A current rating and SOT-23-3 packaging. The primary difference is DC current gain: MMBTA14LT1G specifies 20000 hFE minimum, while MMBTA13LT1G specifies 10000 hFE minimum. MMBTA14LT1G is preferred when higher current gain is required.

Q: What packaging options are available for substitutes?

A: All substitute parts maintain the SOT-23-3 (TO-236-3, SC-59) surface mount package, ensuring mechanical and electrical compatibility with existing PCB layouts. Packaging variations (Cut Tape, Tape & Reel) affect supply format only, not component functionality.

Q: Are automotive-qualified parts available?

A: Yes. BCV27,215 (Nexperia), MMBTA14-7-F (Diodes Incorporated), and BCV27 (onsemi) offer automotive qualification. BCV27,215 and MMBTA14-7-F carry AEC-Q101 qualification, suitable for automotive applications.

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

A: Most substitute parts operate across -55°C to 150°C (TJ). The 2SD1383KT146B and 2SD2142KT146 specify maximum operating temperature of 150°C (TJ) without lower temperature specification in the provided data.

Q: Can I use BCV27,215 in place of BCV27?

A: BCV27,215 is a variant of BCV27 manufactured by Nexperia with automotive qualification (AEC-Q101). The electrical specifications are equivalent, with BCV27,215 offering 0.5 A current rating versus BCV27's 1.2 A. For applications requiring 1.2 A capability, standard BCV27 is preferred.

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