BCW30 Equivalent & Substitute Parts

Part Overview

The BCW30 is a PNP bipolar junction transistor manufactured by onsemi, housed in a SOT-23-3 surface mount package. This device is rated for 32 V collector-emitter breakdown voltage and 500 mA maximum collector current, with a maximum power dissipation of 350 mW. The BCW30 is classified as an obsolete product, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. Substitute parts must maintain electrical compatibility within the specified parameter ranges while accommodating modern active product availability.

Key Parameters

Parameter	BCW30 Specification	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	32	V
Current - Collector (Ic) (Max)	500	mA
Power - Max	350	mW
Vce Saturation (Max) @ Ib, Ic	300mV @ 500µA, 10mA	V
DC Current Gain (hFE) (Min) @ Ic, Vce	215 @ 2mA, 5V	—
Current - Collector Cutoff (Max)	100	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

Substitute parts for the BCW30 are categorized based on electrical parameter compatibility and product status. The substitution logic follows these criteria:

Direct Substitutes (Electrical Equivalents): Parts that maintain the same voltage rating (32 V), saturation voltage characteristics, and DC current gain specifications, with reduced current ratings acceptable for lower-power applications.

Similar Substitutes (Reduced Voltage Rating): Parts rated at 30 V collector-emitter breakdown voltage, which is 2 V lower than the BCW30. These parts are suitable for applications where the 32 V rating is not a critical design constraint. Current ratings vary from 100 mA to 1 A depending on the specific part.

Key Parameters for Substitution Determination:

Collector-emitter breakdown voltage (32 V or 30 V)
Maximum collector current (500 mA or higher)
Saturation voltage characteristics
DC current gain (hFE) minimum specifications
Operating temperature range
SOT-23-3 package compatibility
Product status (Active preferred over Obsolete)

Parameter Comparison

Part Number	Manufacturer	Vce(BR) Max (V)	Ic Max (mA)	Power Max (mW)	Vce Sat @ Ib, Ic	hFE Min @ Ic, Vce	Temp Range (°C)	Product Status	Package
BCW30	onsemi	32	500	350	300mV @ 500µA, 10mA	215 @ 2mA, 5V	-55 to 150	Obsolete	SOT-23-3
BCW30LT1G	onsemi	32	100	300	300mV @ 500µA, 10mA	215 @ 2mA, 5V	-65 to 150	Active	SOT-23-3
SBCW30LT1G	onsemi	32	100	300	300mV @ 500µA, 10mA	215 @ 2mA, 5V	-55 to 150	Active	SOT-23-3
BC858ALT1G	onsemi	30	100	300	650mV @ 5mA, 100mA	125 @ 2mA, 5V	-55 to 150	Active	SOT-23-3
BC858BLT1G	onsemi	30	100	300	650mV @ 5mA, 100mA	220 @ 2mA, 5V	-55 to 150	Active	SOT-23-3
BC858CLT3G	onsemi	30	100	300	650mV @ 5mA, 100mA	420 @ 2mA, 5V	-55 to 150	Active	SOT-23-3
FMMT549	onsemi	30	1000	500	750mV @ 200mA, 2A	100 @ 500mA, 2V	-55 to 150	Active	SOT-23-3
NSS30100LT1G	onsemi	30	1000	310	650mV @ 200mA, 2A	100 @ 500mA, 2V	-55 to 150	Active	SOT-23-3
NSVBC858CLT1G	onsemi	30	100	300	650mV @ 5mA, 100mA	420 @ 2mA, 5V	-55 to 150	Active	SOT-23-3
NSVMMBT589LT1G	onsemi	30	1000	310	650mV @ 200mA, 2A	100 @ 500mA, 2V	-55 to 150	Active	SOT-23-3
2SA1182-Y,LF	Toshiba Semiconductor and Storage	30	500	150	250mV @ 10mA, 100mA	120 @ 100mA, 1V	-55 to 125	Active	SOT-23-3

Engineering Selection Recommendations

For Direct Voltage Rating Compatibility (32 V):

BCW30LT1G and SBCW30LT1G are the primary active alternatives maintaining the 32 V collector-emitter breakdown voltage specification. Both devices are manufactured by onsemi and housed in SOT-23-3 packages. BCW30LT1G is available in Tape & Reel packaging with extended lower temperature rating (-65°C). SBCW30LT1G carries AEC-Q101 automotive qualification and is suitable for automotive applications requiring the 32 V rating.

For 30 V Rated Applications:

When a 2 V reduction in breakdown voltage is acceptable, the BC858 series (BC858ALT1G, BC858BLT1G, BC858CLT3G) and NSV variants (NSVBC858CLT1G) provide active product status with 100 mA current capability. These parts feature 100 MHz transition frequency and are available in multiple packaging formats. DC current gain varies across the BC858 series, with BC858CLT3G offering the highest hFE (420 minimum).

For Higher Current Applications (1 A):

FMMT549, NSS30100LT1G, and NSVMMBT589LT1G support 1 A maximum collector current with 30 V breakdown voltage. These parts are suitable for applications requiring higher current handling than the BCW30's 500 mA rating. All three maintain 100 MHz transition frequency and are available in active product status.

For Non-onsemi Alternatives:

2SA1182-Y,LF from Toshiba Semiconductor and Storage provides 30 V breakdown voltage with 500 mA current capability, matching the BCW30's current rating. This part features 200 MHz transition frequency and lower saturation voltage (250 mV) but reduced maximum power dissipation (150 mW) and narrower upper operating temperature limit (125°C).

Compliance and Certification:

All recommended substitute parts carry RoHS3 compliance and REACH Unaffected status. SBCW30LT1G includes AEC-Q101 automotive qualification for applications requiring automotive-grade components. All parts maintain Moisture Sensitivity Level 1 (Unlimited).

Frequently Asked Questions (FAQ)

Q: Can BCW30LT1G directly replace BCW30 in all applications?

A: BCW30LT1G maintains the same 32 V breakdown voltage, saturation voltage characteristics, and DC current gain specifications as the BCW30. The primary difference is reduced maximum collector current (100 mA versus 500 mA). Direct replacement is suitable for applications where collector current does not exceed 100 mA. BCW30LT1G is an active product with improved availability compared to the obsolete BCW30.

Q: What is the impact of using a 30 V rated part instead of 32 V?

A: A 2 V reduction in collector-emitter breakdown voltage reduces the maximum voltage the transistor can withstand between collector and emitter terminals. Substitution with 30 V rated parts is acceptable only when the circuit design ensures collector-emitter voltage remains below 30 V under all operating conditions, including transient events. Circuit analysis is required to confirm voltage margins.

Q: Are BC858 series parts suitable replacements for BCW30?

A: BC858 series parts (BC858ALT1G, BC858BLT1G, BC858CLT3G) are similar substitutes with 30 V breakdown voltage and 100 mA current capability. These parts feature higher transition frequency (100 MHz) and different saturation voltage characteristics (650 mV versus 300 mV). Substitution requires verification that the 30 V rating and higher saturation voltage are compatible with circuit requirements.

Q: What is the difference between FMMT549 and NSS30100LT1G?

A: Both parts support 1 A maximum collector current and 30 V breakdown voltage. FMMT549 offers 500 mW maximum power dissipation, while NSS30100LT1G is rated for 310 mW. FMMT549 has higher saturation voltage (750 mV) compared to NSS30100LT1G (650 mV). NSS30100LT1G provides better thermal performance in power-limited applications.

Q: Is SBCW30LT1G suitable for automotive applications?

A: SBCW30LT1G carries AEC-Q101 automotive qualification and maintains the 32 V breakdown voltage and saturation voltage specifications of the BCW30. This part is specifically qualified for automotive-grade applications requiring component reliability and traceability standards. Use SBCW30LT1G when automotive qualification is a design requirement.

Q: Can 2SA1182-Y,LF replace BCW30 in high-frequency applications?

A: 2SA1182-Y,LF features 200 MHz transition frequency compared to the BCW30's unspecified transition frequency. This part maintains 500 mA current capability and 30 V breakdown voltage. However, the maximum power dissipation is reduced to 150 mW, and the upper operating temperature is limited to 125°C. Substitution is suitable for high-frequency applications where thermal and temperature constraints are acceptable.

Q: What packaging options are available for BCW30 substitutes?

A: All substitute parts are housed in SOT-23-3 (TO-236-3, SC-59) surface mount packages, maintaining mechanical compatibility with BCW30 footprints. Packaging formats vary: BCW30LT1G and SBCW30LT1G are supplied in Tape & Reel; BC858ALT1G and BC858BLT1G are supplied in Cut Tape & Digi-Reel; BC858CLT3G, NSS30100LT1G, NSVBC858CLT1G, and NSVMMBT589LT1G are supplied in Tape & Reel. Verify packaging requirements for automated assembly processes.

Q: Are all substitute parts RoHS compliant?

A: All recommended substitute parts carry RoHS3 compliance and REACH Unaffected status, meeting environmental and regulatory requirements for electronic components. Moisture Sensitivity Level 1 (Unlimited) applies to all parts, indicating no moisture sensitivity precautions are required during storage and handling.

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