BC858B-7-F Equivalent & Substitute Parts

Part Overview

The BC858B-7-F is a PNP bipolar junction transistor manufactured by Diodes Incorporated, designed for small-signal switching and amplification applications. This surface-mount device operates at 30 V collector-emitter breakdown voltage with a maximum collector current of 100 mA and 300 mW power dissipation. The part is Active status and RoHS3 compliant, making it suitable for modern electronic designs requiring low-power PNP switching functionality in SOT-23-3 packaging.

Equivalent and substitute parts are identified when designs require alternative sourcing, higher current capacity, improved frequency response, or different packaging configurations while maintaining functional compatibility within the specified electrical parameters.

Key Parameters

Parameter	BC858B-7-F Value	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	30	V
Current - Collector (Ic) (Max)	100	mA
Power - Max	300	mW
Frequency - Transition	200	MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	220 @ 2mA, 5V	—
Vce Saturation (Max) @ Ib, Ic	650mV @ 5mA, 100mA	—
Current - Collector Cutoff (Max)	15	nA
Operating Temperature Range	-65 to 150	°C
Package / Case	SOT-23-3	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the BC858B-7-F are categorized based on electrical parameter compatibility and functional equivalence. The primary substitution criteria are:

Critical Parameters for Substitution:

Transistor Type: PNP (mandatory)
Voltage - Collector Emitter Breakdown: 30 V minimum
Current - Collector (Ic): 100 mA minimum
Package compatibility: SOT-23-3 or equivalent surface-mount footprint
DC Current Gain (hFE): 220 minimum @ specified conditions
Vce Saturation: 650 mV maximum @ rated conditions
RoHS3 Compliance: Required for modern applications

Grouping Categories:

Group 1: Direct Electrical Equivalents (100 mA, 30 V, SOT-23-3) Parts that maintain identical or superior electrical specifications within the same package footprint. These include BC858B,215 (Nexperia), BC858BLT1G (onsemi), BC859B,215 (NXP), and NSVBC858BLT1G (onsemi). These parts are pin-compatible and functionally interchangeable with the BC858B-7-F.

Group 2: Higher Current Capacity Substitutes (1 A to 2 A, 30 V) Parts that exceed the 100 mA collector current specification while maintaining 30 V breakdown voltage. These include 2SB1695KT146, 2SB1695TL, 2SB1706TL, and 2SB1710TL from Rohm Semiconductor. These parts require footprint verification but provide enhanced current handling for applications requiring higher switching capacity.

Group 3: Enhanced Performance Substitutes (Higher Frequency, Improved Saturation) Parts offering superior frequency response or improved saturation characteristics. The 30A02CH-TL-E from onsemi provides 520 MHz transition frequency and 220 mV saturation voltage, suitable for high-speed switching applications.

Group 4: Intermediate Current Capacity (700 mA to 1.5 A, 30 V) Parts providing moderate current increases. The 2STR2230 from STMicroelectronics offers 1.5 A capacity in SOT-23-3 packaging with extended temperature range (-65°C to 150°C).

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce Breakdown (Max) V	Power (Max) mW	Frequency (Transition) MHz	Vce Sat (Max) mV	hFE (Min)	Package	Temp Range °C
BC858B-7-F	Diodes Inc.	100	30	300	200	650	220	SOT-23-3	-65 to 150
BC858B,215	Nexperia	100	30	250	100	650	220	TO-236AB	-40 to 150
BC858BLT1G	onsemi	100	30	300	100	650	220	SOT-23-3	-55 to 150
BC859B,215	NXP	100	30	250	100	650	220	TO-236AB	-40 to 150
NSVBC858BLT1G	onsemi	100	30	300	100	650	220	SOT-23-3	-55 to 150
2SB1695KT146	Rohm	1500	30	200	280	370	270	SMT3	-40 to 150
2SB1695TL	Rohm	1500	30	500	280	370	270	TSMT3	-40 to 150
2SB1706TL	Rohm	2000	30	500	280	370	270	TSMT3	-40 to 150
2SB1710TL	Rohm	1000	30	500	320	350	270	TSMT3	-40 to 150
2STR2230	STMicroelectronics	1500	30	500	100	800	170	SOT-23-3	-65 to 150
30A02CH-TL-E	onsemi	700	30	700	520	220	200	3-CPH	-40 to 150

Engineering Selection Recommendations

For Direct Pin-Compatible Replacement: BC858BLT1G (onsemi) and NSVBC858BLT1G (onsemi) provide direct substitution with identical SOT-23-3 packaging and electrical specifications. Both parts maintain 100 mA collector current, 30 V breakdown voltage, and 300 mW power dissipation. These parts are Active status and RoHS3 compliant. BC858BLT1G offers extended temperature range (-55°C to 150°C) compared to the original part's -65°C minimum.

For Automotive-Grade Applications: BC858B,215 (Nexperia) and BC859B,215 (NXP) are qualified to AEC-Q101 automotive standards. Both maintain electrical compatibility with 100 mA collector current and 30 V breakdown voltage. These parts are suitable for automotive switching applications requiring qualification documentation.

For Enhanced Current Capacity (1 A Range): 2SB1710TL (Rohm Semiconductor) provides 1 A collector current with 320 MHz transition frequency and 500 mW power dissipation. This part requires PCB footprint modification due to TSMT3 packaging but offers improved current handling for applications exceeding 100 mA requirements.

For Maximum Current Capacity (1.5 A to 2 A): 2SB1695TL and 2SB1706TL (Rohm Semiconductor) provide 1.5 A and 2 A collector current respectively, with 500 mW power dissipation and 280 MHz transition frequency. These parts require significant PCB layout changes due to TSMT3 packaging but are suitable for high-current switching applications.

For High-Frequency Applications: 30A02CH-TL-E (onsemi) offers 520 MHz transition frequency with 700 mA collector current and superior saturation characteristics (220 mV). This part requires 3-CPH package footprint and is suitable for RF and high-speed switching circuits.

For Extended Temperature Range: 2STR2230 (STMicroelectronics) maintains SOT-23-3 packaging with -65°C to 150°C operating range, matching the original part's temperature specification while providing 1.5 A collector current capacity.

Frequently Asked Questions (FAQ)

Q: Can BC858BLT1G directly replace BC858B-7-F without PCB modifications? A: Yes. BC858BLT1G maintains identical SOT-23-3 packaging and pin configuration. Electrical specifications are compatible: 100 mA collector current, 30 V breakdown voltage, and 300 mW power dissipation. Both parts are RoHS3 compliant.

Q: What is the difference between BC858B,215 and BC858BLT1G? A: BC858B,215 (Nexperia) uses TO-236AB packaging with 250 mW power rating and 100 MHz transition frequency. BC858BLT1G (onsemi) uses SOT-23-3 packaging with 300 mW power rating and 100 MHz transition frequency. Both maintain 100 mA collector current and 30 V breakdown voltage. Package footprints differ; verify PCB compatibility.

Q: Can I use 2SB1710TL as a drop-in replacement for BC858B-7-F? A: No. 2SB1710TL uses TSMT3 packaging (SC-96), which differs from the BC858B-7-F SOT-23-3 footprint. PCB layout modification is required. However, electrical specifications are compatible: 1 A collector current (exceeds 100 mA requirement), 30 V breakdown voltage, and superior 320 MHz transition frequency.

Q: What are the key electrical parameters that determine substitution compatibility? A: Substitution compatibility is determined by: (1) Transistor Type (PNP required), (2) Voltage - Collector Emitter Breakdown (30 V minimum), (3) Current - Collector (100 mA minimum), (4) DC Current Gain (220 minimum @ 2mA, 5V), (5) Vce Saturation (650 mV maximum @ 5mA, 100mA), and (6) Package/footprint compatibility.

Q: Is BC859B,215 suitable for automotive applications? A: Yes. BC859B,215 (NXP) is qualified to AEC-Q101 automotive standard and carries Automotive grade designation. It maintains 100 mA collector current, 30 V breakdown voltage, and 250 mW power dissipation. Verify specific automotive qualification requirements for your application.

Q: What is the advantage of 30A02CH-TL-E over BC858B-7-F? A: 30A02CH-TL-E provides 520 MHz transition frequency (versus 200 MHz), 700 mA collector current (versus 100 mA), and superior saturation voltage of 220 mV (versus 650 mV). These characteristics suit high-speed switching and RF applications. However, 3-CPH packaging requires PCB footprint modification.

Q: Can I use 2STR2230 as a direct replacement? A: 2STR2230 maintains SOT-23-3 packaging and -65°C to 150°C temperature range, matching the original part's footprint and thermal specifications. However, it provides 1.5 A collector current with 800 mV saturation voltage and 170 hFE minimum, which differs from the BC858B-7-F specifications. Verify circuit requirements before substitution.

Q: What packaging types are used in these substitute parts? A: Substitute parts use the following packages: SOT-23-3 (BC858BLT1G, NSVBC858BLT1G, 2STR2230), TO-236AB (BC858B,215, BC859B,215), SMT3 (2SB1695KT146), TSMT3 (2SB1695TL, 2SB1706TL, 2SB1710TL), and 3-CPH (30A02CH-TL-E). Verify PCB footprint compatibility before selection.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All substitute parts listed are RoHS3 compliant, meeting modern environmental and regulatory requirements for electronic component manufacturing.

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