BC858CW-7-F Equivalent & Substitute Parts

Part Overview

The BC858CW-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 in a compact SOT-323 package. The part is currently in active production status with substantial inventory availability (30,400 pieces). Equivalent and substitute parts are identified to support design flexibility, supply chain continuity, and application-specific performance requirements where the original part becomes unavailable or where alternative electrical characteristics better suit specific circuit demands.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Collector-Emitter Breakdown Voltage (Max)	30	V
Collector Current (Max)	100	mA
Power Dissipation (Max)	200	mW
Transition Frequency	200	MHz
DC Current Gain (hFE Min) @ Ic, Vce	420 @ 2mA, 5V	—
Vce Saturation (Max) @ Ib, Ic	650mV @ 5mA, 100mA	—
Collector Cutoff Current (Max)	15	nA
Operating Temperature Range	-65 to 150	°C
Package Type	SOT-323 (SC-70)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the BC858CW-7-F is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor type must be PNP
Collector-emitter breakdown voltage must be 30 V or greater
Maximum collector current must be 100 mA or greater
Package must be SOT-323 (SC-70) or compatible surface mount form factor
Mounting type must be surface mount
Operating temperature range must encompass the application requirements
RoHS3 compliance required

Secondary Compatibility Factors:

Power dissipation of 200 mW or greater supports direct substitution
Transition frequency of 100 MHz or greater is acceptable for general-purpose applications
DC current gain (hFE) minimum of 125 or greater maintains circuit performance
Vce saturation characteristics within specified limits ensure switching behavior

Substitute parts are grouped into two categories: Direct SOT-323 Equivalents (maintaining identical package and form factor) and Alternative Package Options (SOT-23 variants with enhanced electrical performance but requiring PCB layout modification).

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce(br) V	Power mW	fT MHz	hFE Min @ 2mA, 5V	Package	Status
BC858CW-7-F	Diodes Inc.	100	30	200	200	420	SOT-323	Active
BC859CW,115	Nexperia USA	100	30	200	100	420	SOT-323	Active
BC859CW,135	NXP Semiconductors	100	30	200	100	420	SOT-323	Active
BC858AWT1G	onsemi	100	30	150	100	125	SOT-323	Active
BC858BE6327HTSA1	Infineon	100	30	330	250	220	SOT-23	Last Time Buy
BC858BE6433HTMA1	Infineon	100	30	330	250	220	SOT-23	Last Time Buy
BC858BW-G	Comchip Technology	100	30	150	100	220	SOT-323	Active
BC858BWT1G	onsemi	100	100	150	100	220	SOT-323	Active
BC858W,115	Nexperia USA	100	30	200	100	125	SOT-323	Active
BC858W,135	NXP USA	100	30	200	100	125	SOT-323	Active
BC859CE6327HTSA1	Infineon	100	30	330	250	420	SOT-23	Last Time Buy

Engineering Selection Recommendations

Direct Substitutes (SOT-323 Package, No Layout Modification Required):

BC859CW,115 and BC859CW,135 are direct electrical equivalents to the BC858CW-7-F. Both maintain identical collector current (100 mA), breakdown voltage (30 V), and saturation characteristics. The transition frequency is reduced to 100 MHz, which is acceptable for general-purpose switching applications. Both parts carry active product status and are manufactured by Nexperia/NXP with AEC-Q101 automotive qualification. BC859CW,135 offers higher inventory availability (60,782 pieces) in bulk packaging.

BC858BWT1G (onsemi) and BC858W,115 (Nexperia USA) provide SOT-323 compatibility with active status. BC858BWT1G maintains 220 mA hFE minimum at specified conditions with 150 mW power rating. BC858W,115 delivers 200 mW power dissipation matching the original part, with AEC-Q101 qualification and automotive-grade designation.

BC858BW-G (Comchip Technology) operates at 100 MHz transition frequency with 150 mW power dissipation and 220 mA hFE minimum. This part maintains active status with full temperature range coverage (-65°C to 150°C).

Alternative Package Options (SOT-23, PCB Layout Modification Required):

BC858BE6327HTSA1 and BC858BE6433HTMA1 (Infineon) provide enhanced electrical performance with 250 MHz transition frequency and 330 mW power dissipation. Both parts carry Last Time Buy status, indicating discontinued production. These parts require PCB layout modification due to SOT-23 package geometry differing from SOT-323. Selection of these alternatives is appropriate only when higher frequency performance or increased power handling is required and inventory constraints permit.

BC859CE6327HTSA1 (Infineon) offers 250 MHz transition frequency, 330 mW power dissipation, and 420 mA hFE minimum matching the original part's gain specification. This part also carries Last Time Buy status and requires SOT-23 package accommodation.

Recommended Selection Priority:

BC859CW,115 or BC859CW,135 for direct replacement with active product status and high inventory
BC858BWT1G for onsemi-preferred designs with active status and high availability (39,300 pieces)
BC858W,115 or BC858W,135 for automotive-qualified applications with AEC-Q101 certification
Infineon SOT-23 variants only when higher frequency performance is required and layout modification is feasible

Frequently Asked Questions (FAQ)

Q: Can BC859CW,115 directly replace BC858CW-7-F without circuit modification?

A: Yes. BC859CW,115 maintains identical electrical specifications for collector current (100 mA), breakdown voltage (30 V), saturation voltage (650 mV @ 5mA, 100mA), and current gain (420 mA hFE minimum). The transition frequency is reduced from 200 MHz to 100 MHz, which does not affect general-purpose switching applications. Both parts use SOT-323 packaging, eliminating layout changes.

Q: What is the difference between BC858 and BC859 series transistors?

A: The BC858 and BC859 series are both PNP general-purpose transistors with identical voltage and current ratings (30 V, 100 mA). Differences exist in transition frequency and hFE specifications across variants. The BC859 series typically offers lower transition frequency (100 MHz) compared to some BC858 variants (200 MHz). Selection depends on application frequency requirements and gain specifications.

Q: Are the Infineon SOT-23 parts (BC858BE6327HTSA1, BC858BE6433HTMA1) suitable for new designs?

A: These parts carry Last Time Buy status, indicating discontinued production. They are not recommended for new designs requiring long-term supply assurance. Use active-status alternatives such as BC859CW,115, BC858BWT1G, or BC858BW-G instead. SOT-23 variants are appropriate only for existing designs where inventory is available and layout modification is acceptable.

Q: What packaging differences exist between SOT-323 and SOT-23?

A: SOT-323 (SC-70) and SOT-23 (SC-59) are both three-terminal surface mount packages but differ in physical dimensions and pin spacing. SOT-323 is smaller and more compact. Direct substitution between these packages requires PCB layout modification, including trace routing and pad repositioning. Mechanical compatibility cannot be assumed.

Q: Which substitute part offers the highest current gain (hFE)?

A: BC858CW-7-F, BC859CW,115, BC859CW,135, and BC859CE6327HTSA1 all specify 420 mA hFE minimum at 2 mA collector current and 5 V Vce. These parts are preferred when maximum gain is required for low-signal amplification circuits.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification. All parts are also REACH unaffected and carry EAR99 ECCN classification.

Q: What is the significance of AEC-Q101 qualification on BC859CW,115 and BC858W,115?

A: AEC-Q101 qualification indicates the part meets automotive industry reliability standards established by the Automotive Electronics Council. This certification is required for automotive applications and demonstrates compliance with temperature cycling, thermal shock, and long-term reliability testing. Parts without this qualification are suitable for industrial and consumer applications but not automotive use.

Q: Can BC858AWT1G be used in high-frequency applications?

A: BC858AWT1G operates at 100 MHz transition frequency, which is suitable for general-purpose switching and low-frequency amplification. For applications requiring frequencies above 100 MHz, use BC858CW-7-F (200 MHz) or Infineon SOT-23 variants (250 MHz). Frequency capability must match application requirements.

Q: What is the operating temperature range difference between BC858CW-7-F and BC858BWT1G?

A: BC858CW-7-F operates from -65°C to 150°C, while BC858BWT1G operates from -55°C to 150°C. The BC858CW-7-F provides 10°C additional low-temperature capability. For applications requiring operation below -55°C, BC858CW-7-F or BC858BW-G must be selected.

Q: Is moisture sensitivity a concern for these parts?

A: All listed parts carry Moisture Sensitivity Level (MSL) 1, indicating unlimited moisture tolerance. These parts do not require special moisture-controlled storage or handling procedures and can be stored under standard industrial conditions.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message