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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

Nexperia USA Inc. BC858B-QVL

Name: BC858B-QVL
Brand: Nexperia USA Inc.
SKU: BC858B-QVL
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC858B-QVL

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: BC858B-QVL.pdf

Description:: TRANS PNP 30V 0.1A TO-236AB

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BC858B-QVL from Nexperia is a PNP general-purpose bipolar junction transistor in SOT23 (TO-236AB) package, rated for −30 V V_CEO, −100 mA I_C, and DC current gain (h_FE) of 220–475 at V_CE = −5 V and I_C = −2 mA. It serves as a low-voltage, low-current switching or amplification element in automotive signal conditioning and power control stages.

For engineers reviewing the BC858B-QVL datasheet, BC858B-QVL pinout, BC858B-QVL application, or BC858B-QVL equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (500 K/W), saturation voltage (V_CE(sat) ≤ −650 mV @ I_C = −100 mA, I_B = −5 mA), and exact SOT23 pin mapping - all critical for automotive-grade PCB layout and reliability validation.

Technical Context

This device operates as a discrete PNP BJT with fixed emitter-base and collector-base junctions, requiring external base current biasing to control collector current flow. Its −30 V V_CEO rating and −5 V V_EBO define safe operating limits for low-side switching in 12 V automotive subsystems.

The h_FE range of 220–475 ensures predictable current amplification across temperature (−55 °C to +150 °C), while its 500 K/W junction-to-ambient thermal resistance reflects performance on standard FR4 PCBs with single-sided 35 µm copper traces - a key constraint for thermally constrained modules.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−30 V: Maximum allowable collector-emitter voltage with base open; defines maximum supply rail compatibility in low-voltage PNP switch designs.
I_C	−100 mA: Continuous DC collector current limit; sets upper bound for load-driving capability in signal-level switching applications.
h_FE	220–475 @ V_CE = −5 V, I_C = −2 mA: Confirmed DC current gain range enabling stable bias network design for predictable switching thresholds.
V_CE(sat)	≤ −650 mV @ I_C = −100 mA, I_B = −5 mA: Verified saturation voltage ensuring minimal conduction loss and heat generation under full-load switching.
P_tot	250 mW @ T_amb ≤ 25 °C: Total power dissipation limit on standard FR4 PCB; constrains usable duty cycle and ambient temperature envelope.
R_th(j-a)	500 K/W: Junction-to-ambient thermal resistance on specified PCB layout; directly determines temperature rise per watt of dissipated power.

Pinout & Package

SOT23 (TO-236AB) plastic surface-mounted package with 3 leads; compact 2.9 mm × 1.3 mm footprint, 1.1 mm height, and gull-wing terminations compatible with reflow and wave soldering per IPC-7095.

Pin/Terminal	Circuit Role	Design Meaning
1	Base (B)	Control terminal accepting forward-biased current to enable PNP conduction; requires negative voltage relative to emitter for turn-on.
2	Emitter (E)	Current source terminal; connected to higher potential (e.g., V_CC) in common-emitter configurations; defines reference for base bias.
3	Collector (C)	Current sink terminal; delivers controlled output current to load tied between collector and ground or lower potential rail.

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive applications including engine control units and body electronics, with guaranteed operation from −55 °C to +150 °C junction temperature.
Low saturation voltage	V_CE(sat) ≤ −650 mV ensures <1.3% voltage drop across transistor at 100 mA, minimizing power loss and self-heating in battery-sensitive systems.
High h_FE consistency	220–475 gain range enables robust bias design without trimming resistors, reducing BOM count and improving production yield in cost-sensitive modules.
Standard SOT23 footprint	Compatible with industry-standard pick-and-place equipment and reflow profiles, eliminating need for custom stencil or placement calibration.

Applications

Automotive Door Module Switching

Engine Control Unit Signal Conditioning

Use Scenario: Driving small solenoids and LEDs in door lock actuators and mirror position controls.

IC Role / Device Role / Timing Role: PNP switch controlling 12 V loads with microcontroller GPIO-level base drive.

Use Value: −30 V V_CEO and −100 mA I_C safely handle typical 12 V/50 mA door module loads while maintaining AEC-Q101 compliance.

Use Scenario: Level-shifting and noise filtering sensor signals (e.g., throttle position, coolant temp) before ADC input.

IC Role / Device Role / Timing Role: Low-noise amplifier stage with 2 dB NF at 1 kHz, providing gain without introducing significant offset.

Use Value: 220–475 h_FE and 4.5 pF C_c ensure stable small-signal amplification with minimal phase shift in sub-100 kHz sensor bandwidths.

Body Control Module Load Interface

Infotainment System Power Sequencing

Use Scenario: Enabling/disabling 5 V auxiliary rails for USB ports and display backlight drivers during ignition state transitions.

IC Role / Device Role / Timing Role: High-side switch managing power domain sequencing with precise timing via MCU-controlled base current.

Use Value: −650 mV V_CE(sat) limits voltage droop to <130 mV at 100 mA, preserving regulated 5 V rail integrity during startup.

Use Scenario: Controlling power-up sequence of audio codecs and touch controllers using discrete logic-level gating.

IC Role / Device Role / Timing Role: Fast-switching PNP element with f_T ≥ 100 MHz enabling clean edge transitions in 1–10 ms power-enable windows.

Use Value: 100 MHz f_T supports reliable switching up to 10 MHz square waves, ensuring glitch-free sequencing even with fast-rising MCU control signals.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP general-purpose transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC857B-Q	V_CEO = −45 V, h_FE = 220–475, same SOT23 package and pinout	Higher collector-emitter breakdown allows use in 24 V commercial systems where BC858B-Q's −30 V limit is insufficient	Select when system supply exceeds 15 V or transient overvoltage risk exceeds 30 V
BC848B-Q	NPN complement; identical V_CEO, I_C, h_FE, and package but opposite polarity	Used in low-side switching topologies where emitter ties to ground, unlike BC858B-Q's high-side configuration	Select for NPN-based designs requiring matched gain and thermal behavior in complementary pairs

Compared with BC857B-Q, BC858B-Q trades 15 V of breakdown margin for tighter gain binning consistency in automotive-qualified lots; compared with BC848B-Q, it enables high-side sourcing where NPN alternatives require level-shifted drive circuitry.

Availability

BC858B-QVL is available at Aetrix Electronics and suitable for automotive door modules, engine control units, body control modules, and infotainment power sequencing requiring stable component supply, AEC-Q101 traceability, and long-term industrial availability.

Supply support for BC858B-QVL includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Nexperia is a global semiconductor expert focused on essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and consumer markets.

BC858B-QVL belongs to Nexperia's AEC-Q101-qualified general-purpose transistor family, engineered specifically for robust, cost-effective signal switching and amplification in harsh automotive environments.

FAQ

Is BC858B-QVL pin-compatible with BC848B-Q?

No - BC858B-QVL is a PNP transistor with Base-Emitter-Collector pinout (1-2-3), while BC848B-Q is an NPN device with identical SOT23 physical layout but reversed polarity. Swapping them without circuit redesign causes functional failure due to inverted current flow direction and bias requirements.

What is the maximum junction temperature for continuous operation?

The absolute maximum junction temperature is 150 °C, validated under AEC-Q101 stress testing. For reliable long-term operation, junction temperature must remain ≤150 °C under worst-case ambient, power dissipation, and PCB thermal conditions - typically requiring derating above 25 °C ambient per the 500 K/W R_th(j-a).

Does BC858B-QVL support pulse operation beyond 100 mA?

Yes - peak collector current I_CM is rated at −200 mA for short pulses (t_p ≤ 300 µs, duty cycle ≤ 2%). This enables brief inrush current handling for capacitive loads, provided average power remains within the 250 mW P_tot limit and thermal cycling stays within AEC-Q101 lifetime expectations.

How does the −5 V V_EBO rating impact base drive design?

The −5 V emitter-base breakdown voltage mandates that base voltage never exceed emitter voltage by more than 5 V in reverse bias. In practice, this requires clamping or current-limiting in base drive networks to prevent damage during transients or MCU reset states where base may float near V_CC while emitter is at higher potential.

BC858B-QVL Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 100 mA

Voltage - Collector Emitter Breakdown (Max):: 30 V

Vce Saturation (Max) @ Ib, Ic:: 650mV @ 5mA, 100mA

Current - Collector Cutoff (Max):: 15nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 220 @ 2mA, 5V

Power - Max:: 250 mW

Frequency - Transition:: 100MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

BC858B-QVL FAQ

1.How can I place an order for BC858B-QVL through Aetrix?

Please submit a Request for Quotation (RFQ) for BC858B-QVL on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for BC858B-QVL reliable?

The price and inventory of BC858B-QVL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC858B-QVL is usually 5 days.

3.What payment methods are accepted for BC858B-QVL?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC858B-QVL transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC858B-QVL?

BC858B-QVL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC858B-QVL order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for BC858B-QVL?

For technical support, including BC858B-QVL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC858B-QVL requirements.

6.How does Aetrix verify that BC858B-QVL is sourced from the original manufacturer or authorized distributors?

All BC858B-QVL products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BC858B-QVL meets industry standards.

7.What is the process for return or replacement of BC858B-QVL?

All BC858B-QVL units undergo pre-shipment inspection (PSI). If there is an issue with BC858B-QVL, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The BC858B-QVL part is unused and in its original packaging.

Return procedure for BC858B-QVL:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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