BCV27TC Equivalent & Substitute Parts

Part Overview

The BCV27TC is an NPN Darlington bipolar junction transistor manufactured by Diodes Incorporated, designed for surface mount applications in the SOT-23-3 package. This device operates at a maximum collector current of 500 mA with a 30 V collector-emitter breakdown voltage and delivers 330 mW maximum power dissipation. The BCV27TC is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility within specified electrical and mechanical parameters.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN - Darlington	—
Current - Collector (Ic) Max	500	mA
Voltage - Collector Emitter Breakdown (Max)	30	V
Vce Saturation (Max) @ Ib, Ic	1 V @ 100 µA, 100 mA	—
DC Current Gain (hFE) Min @ Ic, Vce	20000 @ 100 mA, 5 V	—
Power - Max	330	mW
Frequency - Transition	170	MHz
Operating Temperature	-55 to 150	°C
Package / Case	SOT-23-3 (TO-236-3, SC-59)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the BCV27TC is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor Type: NPN - Darlington configuration
Package / Case: SOT-23-3 (TO-236-3, SC-59) or compatible surface mount package
Voltage - Collector Emitter Breakdown: minimum 30 V
Current - Collector (Ic) Max: minimum 500 mA for direct replacement; 300 mA for reduced-current applications
DC Current Gain (hFE): minimum 5000 @ 100 mA, 5 V
Operating Temperature Range: minimum -55°C to 150°C or subset thereof
RoHS Compliance: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Substitution Categories:

Category 1: Direct Electrical Equivalents (500 mA Current Rating) Parts meeting or exceeding the full 500 mA collector current specification with matching voltage and gain characteristics.

Category 2: Reduced-Current Equivalents (300 mA Current Rating) Parts with 300 mA maximum collector current, suitable for applications not requiring the full 500 mA specification. These parts maintain voltage, gain, and package compatibility.

Category 3: Enhanced Performance Variants Parts with higher current ratings (1.2 A) or improved frequency response that provide superior performance margins while maintaining backward compatibility.

Parameter Comparison

Part Number	Manufacturer	Product Status	Ic Max (mA)	Vce Breakdown (V)	Vce Sat @ 100µA, 100mA (V)	hFE Min @ 100mA, 5V	Power Max (mW)	Freq Trans (MHz)	Temp Range (°C)	Package
BCV27TC	Diodes Incorporated	Obsolete	500	30	1.0	20000	330	170	-55 to 150	SOT-23-3
BCV27	onsemi	Active	1200	30	1.0	20000	350	220	-55 to 150	SOT-23-3
BCV27,215	Nexperia USA Inc.	Active	500	30	1.0	20000	250	220	-55 to 150	TO-236AB
PMBTA14,215	NXP Semiconductors	Active	500	30	1.5	20000	250	125	-55 to 150	TO-236AB
PMBTA13,215	Nexperia USA Inc.	Active	500	30	1.5	10000	250	125	-55 to 150	TO-236AB
MMBTA14-7-F	Diodes Incorporated	Active	300	30	1.5	20000	300	125	-55 to 150	SOT-23-3
MMBTA14LT1G	onsemi	Active	300	30	1.5	20000	225	125	-55 to 150	SOT-23-3
SMMBTA14LT1G	onsemi	Active	300	30	1.5	20000	225	125	-55 to 150	SOT-23-3
SMMBTA14LT3G	onsemi	Active	300	30	1.5	20000	225	125	-55 to 150	SOT-23-3
2SD2142KT146	Rohm Semiconductor	Active	300	30	1.5	10000	200	200	-55 to 150	SMT3
2SD1383KT146B	Rohm Semiconductor	Active	300	32	1.5	5000	200	250	-55 to 150	SMT3

Engineering Selection Recommendations

For Direct Replacement (500 mA Applications):

The BCV27 manufactured by onsemi is the primary active equivalent. This part maintains the 500 mA collector current specification, 30 V breakdown voltage, and identical DC current gain of 20000 @ 100 mA, 5 V. The BCV27 offers enhanced performance with 1.2 A maximum current capability and 220 MHz transition frequency, providing superior operational margins. Operating temperature range matches the original specification (-55°C to 150°C). This part is in active production status with high inventory availability (107,836 units).

The BCV27,215 from Nexperia USA Inc. provides an alternative direct replacement with identical electrical specifications for the 500 mA current requirement. This part is AEC-Q101 qualified for automotive applications and maintains active product status.

For Reduced-Current Applications (300 mA or Less):

When application requirements do not exceed 300 mA collector current, the MMBTA14-7-F (Diodes Incorporated), MMBTA14LT1G (onsemi), SMMBTA14LT1G (onsemi), and SMMBTA14LT3G (onsemi) provide suitable alternatives. These parts maintain the 30 V breakdown voltage and 20000 hFE minimum gain specification. The MMBTA14-7-F is AEC-Q101 qualified for automotive-grade applications.

The 2SD2142KT146 from Rohm Semiconductor operates at 300 mA with 30 V breakdown voltage and 200 MHz transition frequency. This part maintains RoHS3 compliance and unlimited moisture sensitivity rating.

For Enhanced Performance Requirements:

The 2SD1383KT146B from Rohm Semiconductor provides 32 V breakdown voltage (exceeding the 30 V specification) and 250 MHz transition frequency. This part is suitable for applications requiring higher voltage margins or improved high-frequency performance.

Compliance and Qualification:

All recommended substitutes maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating. Parts designated with automotive-grade qualification (MMBTA14-7-F, BCV27,215, PMBTA14,215, PMBTA13,215) carry AEC-Q101 certification, suitable for automotive and industrial applications requiring enhanced reliability standards.

Frequently Asked Questions (FAQ)

Q: Can the BCV27TC be directly replaced with the BCV27 from onsemi?

A: Yes. The BCV27 maintains identical electrical specifications for the primary parameters: 500 mA collector current, 30 V breakdown voltage, 1 V Vce saturation @ 100 µA/100 mA, and 20000 hFE minimum gain. Both devices use the SOT-23-3 package. The BCV27 is in active production status and provides superior performance margins with 1.2 A maximum current capability and 220 MHz transition frequency.

Q: What is the difference between the 500 mA and 300 mA substitute options?

A: The 500 mA options (BCV27, BCV27,215, PMBTA14,215, PMBTA13,215) are suitable for applications requiring the full current specification of the original BCV27TC. The 300 mA options (MMBTA14-7-F, MMBTA14LT1G, SMMBTA14LT1G, SMMBTA14LT3G, 2SD2142KT146, 2SD1383KT146B) are appropriate for circuits designed to operate at or below 300 mA collector current. Selection depends on the actual current requirements of the application.

Q: Are all substitute parts available in the same package as the BCV27TC?

A: The BCV27TC uses the SOT-23-3 package. Most substitutes are available in SOT-23-3 or compatible packages (TO-236-3, SC-59, TO-236AB, SMT3). These packages are mechanically and electrically compatible for surface mount PCB assembly. Verify PCB footprint compatibility before final selection.

Q: Which substitute parts carry automotive qualification?

A: The following parts are AEC-Q101 qualified: MMBTA14-7-F (Diodes Incorporated), BCV27,215 (Nexperia USA Inc.), PMBTA14,215 (NXP Semiconductors), and PMBTA13,215 (Nexperia USA Inc.). These parts are suitable for automotive and industrial applications requiring enhanced reliability certification.

Q: What is the significance of the Vce saturation voltage difference between substitutes?

A: The BCV27TC specifies 1.0 V Vce saturation @ 100 µA, 100 mA. Several substitutes specify 1.5 V under the same conditions. This 0.5 V difference affects power dissipation in saturated switching applications. For applications where the transistor operates in saturation (digital switching, relay drivers), the higher Vce saturation will result in increased power dissipation. For linear amplification applications, this difference is typically negligible.

Q: Can I use a 32 V rated part (2SD1383KT146B) in place of the 30 V BCV27TC?

A: Yes. The 2SD1383KT146B with 32 V breakdown voltage exceeds the 30 V specification of the BCV27TC. This provides additional voltage margin and is suitable for replacement. However, verify that the application circuit does not depend on the specific 30 V breakdown characteristic.

Q: What is the difference between MMBTA14LT1G, SMMBTA14LT1G, and SMMBTA14LT3G?

A: All three parts are manufactured by onsemi and share identical electrical specifications: 300 mA collector current, 30 V breakdown voltage, 20000 hFE minimum gain, and SOT-23-3 package. The designations LT1G and LT3G refer to different manufacturing date codes and tape reel configurations. Electrical performance is equivalent; selection depends on inventory availability and packaging requirements.

Q: Are there any temperature range limitations with the substitute parts?

A: The BCV27TC operates from -55°C to 150°C. All recommended substitutes maintain this full temperature range or a subset thereof. The BCV27, MMBTA14-7-F, MMBTA14LT1G, SMMBTA14LT1G, and SMMBTA14LT3G all specify -55°C to 150°C. The PMBTA14,215, PMBTA13,215, BCV27,215, 2SD2142KT146, and 2SD1383KT146B specify -55°C to 150°C or -40°C to 150°C. Verify the specific temperature range requirement of your application.

Q: What is the inventory status of these substitute parts?

A: The BCV27 from onsemi has the highest inventory availability (107,836 units). Other parts with substantial inventory include PMBTA14,215 (99,782 units), MMBTA14LT1G (125,300 units), 2SD1383KT146B (57,400 units), and SMMBTA14LT1G (15,400 units). The original BCV27TC (Diodes Incorporated) has 849 units available but is classified as obsolete. For long-term supply security, prioritize active-status parts with higher inventory levels.

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