BC858BW-7-F Equivalent & Substitute Parts

Part Overview

The BC858BW-7-F is a PNP bipolar junction transistor manufactured by Diodes Incorporated, designed for general-purpose switching and amplification applications. This surface mount device operates at 30 V maximum collector-emitter voltage with a maximum collector current of 100 mA and delivers 200 mW power dissipation. The part is packaged in SOT-323 (SC-70) configuration and is currently in active production status with 10,600 units in stock.

Equivalent and substitute parts are necessary when the primary part becomes unavailable, when alternative manufacturers offer improved lead times, or when design requirements permit operation within the broader electrical and mechanical specifications of compatible devices. Substitution is valid only when all critical electrical parameters remain within acceptable operating ranges and package compatibility is maintained.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Collector Current (Max)	100	mA
Collector-Emitter Breakdown Voltage (Max)	30	V
Vce Saturation (Max) @ Ib, Ic	650 mV @ 5 mA, 100 mA	—
Collector Cutoff Current (Max)	15	nA
DC Current Gain (hFE Min) @ Ic, Vce	220 @ 2 mA, 5 V	—
Power Dissipation (Max)	200	mW
Transition Frequency	200	MHz
Operating Temperature Range	−65 to +150	°C
Package / Case	SC-70, SOT-323	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the BC858BW-7-F is determined by strict adherence to the following electrical and mechanical criteria:

Critical Substitution Parameters:

Transistor type must be PNP
Collector current rating must be ≥ 100 mA
Collector-emitter breakdown voltage must be ≥ 30 V
Vce saturation must not exceed 650 mV @ 5 mA, 100 mA
Collector cutoff current must not exceed 15 nA
DC current gain (hFE) minimum must be ≥ 125 @ 2 mA, 5 V
Power dissipation must be ≥ 150 mW
Package must be SOT-323 (SC-70) or SOT-23-3 (TO-236) surface mount configurations
Operating temperature range must support the application requirement
RoHS3 compliance and MSL 1 rating required

Substitute parts are grouped into two categories: Direct SOT-323 Substitutes (identical package) and Alternative Package Substitutes (SOT-23-3 package, larger footprint, higher power capability). Parts with obsolete or last-time-buy status are identified separately.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce(br) V	Vce Sat mV	hFE Min	Power mW	Freq MHz	Temp °C	Package	Status
BC858BW-7-F	Diodes Inc.	100	30	650	220	200	200	−65 to +150	SOT-323	Active
BC858BWT1G	onsemi	100	30	650	220	150	100	−55 to +150	SC-70-3	Active
BC858AWT1G	onsemi	100	30	650	125	150	100	−55 to +150	SC-70-3	Active
BC858BE6327HTSA1	Infineon	100	30	650	220	330	250	−40 to +150	SOT-23-3	Last Time Buy
BC858BLT3G	onsemi	100	30	650	220	300	100	−55 to +150	SOT-23-3	Active
BC858BW-G	Comchip	100	30	650	220	150	100	−65 to +150	SOT-323	Active
BC858BWH6327XTSA1	Infineon	100	30	650	220	250	250	−40 to +150	SOT-323	Obsolete
BC858CWH6327XTSA1	Infineon	100	30	650	420	250	250	−40 to +150	SOT-323	Last Time Buy
BC858W,115	Nexperia	100	30	600	125	200	100	−40 to +150	SOT-323	Active
BC858W,135	NXP USA	100	30	600	125	200	100	−40 to +150	SOT-323	Active
BC859B,215	NXP Semi.	100	30	650	220	250	100	−40 to +150	SOT-23-3	Active

Engineering Selection Recommendations

Direct SOT-323 Package Substitutes (Identical Footprint):

The following parts maintain the SOT-323 package configuration and are suitable for direct board-level replacement without layout modification:

BC858BWT1G (onsemi): Active status, meets all electrical parameters. Transition frequency reduced to 100 MHz and power rating reduced to 150 mW. Operating temperature minimum raised to −55°C. Suitable for applications not requiring the full 200 MHz bandwidth or 200 mW power capability of the original part.
BC858BW-G (Comchip): Active status, meets all electrical parameters. Maintains 150 mW power rating and 100 MHz transition frequency. Operating temperature range matches the original part (−65 to +150°C). Provides equivalent performance with alternative manufacturer sourcing.
BC858W,115 and BC858W,135 (Nexperia/NXP): Active status, automotive-qualified (AEC-Q101). Vce saturation reduced to 600 mV, providing improved switching characteristics. DC current gain reduced to 125 minimum. Operating temperature minimum raised to −40°C. Suitable for automotive applications requiring AEC-Q101 qualification.

Alternative SOT-23-3 Package Substitutes (Larger Footprint, Enhanced Capability):

These parts require PCB layout modification due to different package geometry but offer enhanced electrical performance:

BC858BLT3G (onsemi): Active status. SOT-23-3 package provides 300 mW power dissipation and maintains 100 MHz transition frequency. Meets all electrical parameters. Suitable for designs where increased power handling is beneficial and package size increase is acceptable.
BC859B,215 (NXP Semiconductors): Active status, automotive-qualified (AEC-Q101). SOT-23-3 package with 250 mW power rating. Meets all electrical parameters. Extensive inventory availability (9.5 million units). Suitable for high-volume automotive applications.

Parts Not Recommended for New Designs:

BC858BE6327HTSA1 (Infineon): Last Time Buy status. SOT-23-3 package with enhanced 330 mW power and 250 MHz transition frequency. Inventory limited to 1,014 units. Suitable only for existing design continuation.
BC858BWH6327XTSA1 (Infineon): Obsolete status. SOT-323 package with 250 mW power and 250 MHz transition frequency. Inventory limited to 817 units. Not recommended for new designs.
BC858CWH6327XTSA1 (Infineon): Last Time Buy status. SOT-323 package with elevated DC current gain (420 minimum). Inventory limited to 967 units. Not recommended for new designs.
BC858AWT1G (onsemi): Active status but reduced DC current gain (125 minimum) compared to original specification (220 minimum). Suitable only for applications with relaxed gain requirements.

Frequently Asked Questions (FAQ)

Q: Can BC858BWT1G be used as a direct replacement for BC858BW-7-F?

A: Yes, BC858BWT1G is electrically compatible for direct replacement in SOT-323 package applications. Both parts meet the critical electrical parameters: 100 mA collector current, 30 V breakdown voltage, 650 mV saturation voltage, and 220 minimum DC current gain. The primary differences are reduced transition frequency (100 MHz vs. 200 MHz) and reduced power rating (150 mW vs. 200 mW). Substitution is valid for applications not requiring the full bandwidth or power capability of the original part.

Q: What is the difference between SOT-323 and SOT-23-3 packages?

A: SOT-323 (SC-70) and SOT-23-3 (TO-236) are both three-terminal surface mount packages but differ in physical dimensions and power handling. SOT-323 is smaller with lower power dissipation capability (typically 150–200 mW). SOT-23-3 is larger with higher power dissipation capability (typically 250–330 mW). Parts in SOT-23-3 package require different PCB footprints and cannot be used as direct drop-in replacements without layout modification. However, SOT-23-3 substitutes provide enhanced thermal performance for power-sensitive applications.

Q: Are automotive-qualified versions available?

A: Yes. BC858W,115 and BC858W,135 (Nexperia/NXP) are automotive-qualified to AEC-Q101 standard in SOT-323 package. BC859B,215 (NXP Semiconductors) is automotive-qualified to AEC-Q101 standard in SOT-23-3 package. These parts are suitable for automotive applications requiring formal qualification documentation.

Q: What does "Last Time Buy" status mean?

A: Last Time Buy status indicates that the manufacturer has announced end-of-life for the part and will accept orders only until a specified cutoff date. After that date, the part will no longer be available. Parts with this status should not be selected for new designs. Existing designs using these parts should transition to active-status alternatives before the Last Time Buy deadline.

Q: What does "Obsolete" status mean?

A: Obsolete status indicates that the manufacturer has discontinued production and no longer accepts new orders. Parts with this status are available only from existing inventory held by distributors. Obsolete parts should not be used in new designs. Existing designs using obsolete parts must transition to active-status alternatives.

Q: Can I use BC859B,215 instead of BC858BW-7-F?

A: Yes, BC859B,215 is electrically compatible and meets all critical parameters. Both parts are PNP transistors with 100 mA collector current, 30 V breakdown voltage, and 650 mV saturation voltage. BC859B,215 is packaged in SOT-23-3 (larger footprint) instead of SOT-323, requiring PCB layout modification. BC859B,215 offers higher power dissipation (250 mW vs. 200 mW) and automotive qualification (AEC-Q101). Substitution is valid when the larger package footprint can be accommodated in the design.

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

A: DC current gain (hFE) determines the base current required to achieve a specified collector current. The BC858BW-7-F specifies minimum hFE of 220 @ 2 mA, 5 V. Some substitutes (BC858W,115, BC858W,135, BC858AWT1G) specify minimum hFE of 125, requiring approximately 1.76 times more base current for the same collector current. BC858CWH6327XTSA1 specifies minimum hFE of 420, requiring less base current. Designs with tight base current budgets must account for these differences.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are RoHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the original BC858BW-7-F specification. All parts are suitable for lead-free soldering processes.

Q: What is the operating temperature range consideration?

A: The BC858BW-7-F operates from −65°C to +150°C. Some substitutes have narrower ranges: onsemi parts (BC858BWT1G, BC858AWT1G, BC858BLT3G) operate from −55°C to +150°C; Nexperia/NXP and Infineon parts operate from −40°C to +150°C. For applications requiring operation below −55°C, only BC858BW-7-F and BC858BW-G are suitable. For applications operating above +150°C, no substitutes are available.

Q: Which substitute offers the best inventory availability?

A: BC859B,215 (NXP Semiconductors) offers the highest inventory availability with 9,498,645 units in stock. BC858W,135 (NXP USA) offers 20,400 units. BC858BLT3G (onsemi) offers 39,897 units. BC858BWT1G (onsemi) offers 39,300 units. For high-volume applications, BC859B,215 and BC858BLT3G provide the most reliable long-term supply.

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