BCV27_D87Z Equivalent & Substitute Parts

Part Overview

The BCV27_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 with a 30 V collector-emitter breakdown voltage and delivers 350 mW maximum power dissipation. The device is classified as obsolete, necessitating identification of active equivalent and substitute components for ongoing design requirements and production continuity.

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 V @ 100 µA, 100 mA	—
DC Current Gain (hFE) (Min) @ Ic, Vce	20000 @ 100 mA, 5 V	—
Power - Max	350	mW
Frequency - Transition	220	MHz
Operating Temperature Range	-55 to 150	°C
Package / Case	SOT-23-3 (TO-236-3, SC-59)	—
Mounting Type	Surface Mount	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the BCV27_D87Z is determined by the following critical parameters:

Primary Substitution Criteria:

Transistor type: NPN - Darlington configuration
Package compatibility: SOT-23-3 surface mount form factor
Voltage rating: Minimum 30 V collector-emitter breakdown voltage
Current capability: Minimum 1.2 A collector current for direct replacement; lower current ratings (0.3 A to 0.5 A) acceptable for current-limited applications
DC current gain (hFE): Minimum 10000 at specified test conditions
Operating temperature range: -55°C to 150°C minimum

Substitution Categories:

Category 1 - Parametric Equivalent (Full Replacement): Parts with identical or superior electrical specifications across all critical parameters, enabling direct substitution without circuit modification.

Category 2 - Similar Substitute (Current-Limited Applications): Parts with reduced maximum collector current (0.3 A to 0.5 A) but matching voltage ratings, saturation characteristics, and package form factor. These substitutes are applicable in circuits where collector current does not exceed the substitute part's rating.

Category 3 - Cross-Manufacturer Alternatives: Parts from alternative manufacturers (Rohm Semiconductor, Nexperia USA Inc., Diodes Incorporated) meeting equivalent electrical and mechanical specifications with SOT-23-3 packaging.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) [A]	Vce(br) [V]	Vce Sat @ Ib, Ic [V]	hFE (Min) @ Ic, Vce	Power [mW]	fT [MHz]	Package	Status
BCV27_D87Z	onsemi	1.2	30	1.0 @ 100µA, 100mA	20000 @ 100mA, 5V	350	220	SOT-23-3	Obsolete
BCV27	onsemi	1.2	30	1.0 @ 100µA, 100mA	20000 @ 100mA, 5V	350	220	SOT-23-3	Active
BCV27,215	Nexperia USA Inc.	0.5	30	1.0 @ 100µA, 100mA	20000 @ 100mA, 5V	250	220	SOT-23-3	Active
MMBTA14LT1G	onsemi	0.3	30	1.5 @ 100µA, 100mA	20000 @ 100mA, 5V	225	125	SOT-23-3	Active
MMBTA14-7-F	Diodes Incorporated	0.3	30	1.5 @ 100µA, 100mA	20000 @ 100mA, 5V	300	125	SOT-23-3	Active
MMBTA13LT1G	onsemi	0.3	30	1.5 @ 100µA, 100mA	10000 @ 100mA, 5V	225	125	SOT-23-3	Active
2SD2142KT146	Rohm Semiconductor	0.3	30	1.5 @ 100µA, 100mA	10000 @ 100mA, 5V	200	200	SOT-23-3	Active
2SD1383KT146B	Rohm Semiconductor	0.3	32	1.5 @ 400µA, 200mA	5000 @ 100mA, 5V	200	250	SOT-23-3	Active
SMMBTA14LT1G	onsemi	0.3	30	1.5 @ 100µA, 100mA	20000 @ 100mA, 5V	225	125	SOT-23-3	Active
SMMBTA14LT3G	onsemi	0.3	30	1.5 @ 100µA, 100mA	20000 @ 100mA, 5V	225	125	SOT-23-3	Active
MMBTA13LT3G	onsemi	0.3	30	1.5 @ 100µA, 100mA	10000 @ 100mA, 5V	225	125	SOT-23-3	Active

Engineering Selection Recommendations

Direct Replacement (Parametric Equivalent):

The BCV27 (onsemi, active status) is the direct parametric equivalent to BCV27_D87Z. This part maintains identical electrical specifications including 1.2 A maximum collector current, 30 V breakdown voltage, 20000 hFE minimum gain, and 220 MHz transition frequency. The BCV27 is available in active production status with RoHS3 compliance and AEC-Q101 automotive qualification, ensuring supply chain continuity and regulatory compliance.

Current-Limited Substitutes (0.3 A to 0.5 A Range):

For applications where collector current does not exceed 0.5 A, the BCV27,215 (Nexperia USA Inc.) provides a suitable alternative with matching 30 V voltage rating, identical saturation characteristics, and 220 MHz transition frequency. This part carries AEC-Q101 automotive qualification and active production status.

For applications limited to 0.3 A collector current, the following parts are applicable:

MMBTA14LT1G, MMBTA14LT3G, SMMBTA14LT1G, SMMBTA14LT3G (onsemi): All maintain 20000 hFE minimum gain with 30 V voltage rating and SOT-23-3 packaging. These parts are available in active production with RoHS3 compliance.
MMBTA14-7-F (Diodes Incorporated): Provides 20000 hFE minimum gain with 30 V voltage rating and AEC-Q101 automotive qualification in active production status.
MMBTA13LT1G, MMBTA13LT3G (onsemi): Offer 10000 hFE minimum gain with 30 V voltage rating and active production status. These parts are suitable for applications where lower current gain is acceptable.
2SD2142KT146 (Rohm Semiconductor): Delivers 10000 hFE minimum gain with 30 V voltage rating and 200 MHz transition frequency in active production status.

Cross-Manufacturer Alternative:

The 2SD1383KT146B (Rohm Semiconductor) provides a 32 V voltage rating with 250 MHz transition frequency, offering enhanced voltage margin. However, this part specifies 5000 hFE minimum gain and different saturation test conditions (400 µA, 200 mA), requiring circuit evaluation for compatibility.

Compliance and Production Status:

All recommended active substitutes carry RoHS3 compliance and MSL 1 (unlimited) moisture sensitivity rating. The MMBTA14-7-F and BCV27,215 include AEC-Q101 automotive qualification, suitable for automotive and high-reliability applications.

Frequently Asked Questions (FAQ)

Q: Can the BCV27_D87Z be directly replaced with the BCV27?

A: Yes. The BCV27 is the parametric equivalent with identical electrical specifications: 1.2 A maximum collector current, 30 V breakdown voltage, 20000 hFE minimum gain, and 220 MHz transition frequency. Both use SOT-23-3 packaging. The BCV27 is in active production status, whereas BCV27_D87Z is obsolete.

Q: What is the difference between MMBTA14LT1G and MMBTA13LT1G?

A: Both parts share identical electrical specifications except for DC current gain. MMBTA14LT1G specifies 20000 hFE minimum gain, while MMBTA13LT1G specifies 10000 hFE minimum gain. Both are rated for 0.3 A maximum collector current and 30 V breakdown voltage. Selection depends on circuit requirements for current gain.

Q: Can I use a 0.3 A rated part in place of the 1.2 A BCV27_D87Z?

A: Substitution is limited to applications where the actual collector current does not exceed 0.3 A. The 0.3 A rated parts (MMBTA14LT1G, MMBTA13LT1G, 2SD2142KT146, 2SD1383KT146B, MMBTA14-7-F, SMMBTA14LT1G, SMMBTA14LT3G) are suitable for current-limited circuits. For applications requiring full 1.2 A capability, use BCV27 or BCV27,215 (0.5 A minimum).

Q: What packaging options are available for substitutes?

A: All listed substitutes use SOT-23-3 (TO-236-3, SC-59) surface mount packaging, matching the BCV27_D87Z form factor. Packaging variants include Cut Tape (CT) & Digi-Reel®, Tape & Reel (TR), and standard supplier device packages. Verify specific packaging availability with your supplier for procurement requirements.

Q: Are there automotive-qualified alternatives?

A: Yes. The MMBTA14-7-F (Diodes Incorporated) and BCV27,215 (Nexperia USA Inc.) both carry AEC-Q101 automotive qualification. These parts are suitable for automotive and high-reliability applications requiring formal qualification documentation.

Q: What is the significance of the hFE (DC current gain) specification?

A: DC current gain determines the base current required to achieve a specified collector current. Higher hFE values (20000) require less base drive current than lower values (10000 or 5000). Circuit design must account for the minimum hFE specification of the selected substitute to ensure proper biasing and switching performance.

Q: How do saturation voltage specifications differ among substitutes?

A: The BCV27_D87Z and most substitutes specify 1.0 V to 1.5 V saturation voltage at different test conditions. The 2SD1383KT146B specifies 1.5 V at 400 µA base current and 200 mA collector current, differing from the standard 100 µA, 100 mA test condition. Verify saturation characteristics match your circuit's operating point requirements.

Q: What is the operating temperature range for substitutes?

A: The BCV27_D87Z operates from -55°C to 150°C. Most active substitutes maintain this range. The 2SD2142KT146 and 2SD1383KT146B specify maximum junction temperature of 150°C without explicit minimum temperature, but are suitable for standard industrial and automotive temperature ranges.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All listed active substitutes carry RoHS3 compliance certification, meeting environmental and regulatory requirements for lead-free manufacturing and hazardous substance restrictions.

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