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

onsemi BC556_J35Z

Name: BC556_J35Z
Brand: onsemi
SKU: BC556_J35Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC556_J35Z

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Datasheet:: BC556_J35Z.pdf

Description:: TRANS PNP 65V 0.1A TO-92-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BC556_J35Z from onsemi is a PNP epitaxial silicon transistor designed for general-purpose switching and linear amplification in low-to-medium power circuits, with confirmed V_CEO = −65 V, I_C = −100 mA DC, h_FE = 110–800 (Class A/B/C), f_T = 150 MHz, and TO-92-3 (Case 135AR) package. It serves as a complement to BC546–BC550 NPN devices in dual-polarity amplifier stages and discrete logic interfaces.

For engineers reviewing the BC556_J35Z datasheet, pinout, applications, or equivalent options, key selection criteria include verified PNP polarity, −65 V collector-emitter breakdown, low-noise capability (NF = 2–10 dB at 1 kHz), TO-92 mechanical compatibility, and RoHS-compliant Pb-free construction.

Technical Context

The BC556_J35Z operates as a medium-voltage, medium-current PNP bipolar junction transistor optimized for both saturated switching (V_CE(sat) = −90 mV min at I_C = −10 mA/I_B = −0.5 mA) and active-mode amplification (h_FE stable across I_C = −0.1 to −100 mA). Its −80 V V_CBO rating supports high-side switching in rail-referenced configurations.

Thermal performance is defined by R_JA = 250 °C/W (FR-4 PCB, 76 mm × 114 mm), PD = 500 mW at T_A = 25 °C with 4.0 mW/°C derating, and T_J = 150 °C maximum junction temperature - enabling reliable operation in ambient temperatures up to +85 °C with appropriate board layout.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−65 V: Enables use in −48 V telecom supplies and high-side switch nodes up to 65 V below ground reference.
I_C (DC)	−100 mA: Supports load switching and pre-driver stages for small-signal MOSFETs or relays without forced cooling.
h_FE	110–800 (Class A/B/C): Allows flexible bias design - Class B (200–450) balances gain and consistency for audio preamps.
f_T	150 MHz: Sufficient for RF front-end amplification up to VHF band (e.g., 30–100 MHz IF stages) under specified conditions.
NF	2–10 dB @ 1 kHz: Confirmed low-noise performance suitable for microphone preamplifiers and sensor signal conditioning.
C_ob	6 pF @ V_CB = −10 V: Limits Miller effect in high-gain common-emitter amplifiers; enables stable >10 MHz bandwidth.

Pinout & Package

BC556_J35Z is housed in TO-92-3 package (Case 135AR), with standardized leadform: lead 1 = Collector, lead 2 = Base, lead 3 = Emitter, viewed from flat side with leads down and marking facing outward.

Pin/Terminal	Circuit Role	Design Meaning
1 (Collector)	Current sink node	Connected to most negative potential in PNP configuration; handles full load current and must route away from sensitive analog traces.
2 (Base)	Control input	Receives forward-biased current to turn on device; requires series resistor to limit I_B ≤ −200 mA pulse per datasheet.
3 (Emitter)	Reference terminal	Typically tied to system ground or positive rail; establishes V_BE bias point and defines current mirror reference node.

Key Features

Feature	Design Value
High-voltage PNP switching	V_CEO = −65 V enables direct replacement of older −50 V PNP transistors in legacy industrial controls.
Low-noise amplification	NF = 2–10 dB at 1 kHz supports high-fidelity audio preamp stages without added op-amp complexity.
Complementary pairing	Designed as direct PNP counterpart to BC546–BC550 NPN series, simplifying push-pull stage layout and biasing.
Pb-free & RoHS compliance	Meets EU RoHS Directive 2011/65/EU and halogen-free requirements for modern consumer and medical electronics.

Applications

Audio Pre-amplifier Stage	Discrete Logic Level Shifter
Use Scenario: Amplifying low-level signals from electret microphones or piezoelectric sensors before ADC sampling. IC Role / Device Role / Timing Role: PNP common-emitter voltage amplifier with emitter-degeneration bias for stable gain and low distortion. Use Value: Achieves 2–10 dB noise figure and >100 kHz bandwidth while operating from single-supply rails (e.g., +5 V with emitter at V_CC).	Use Scenario: Translating 3.3 V logic outputs to −5 V or −12 V control lines in mixed-voltage industrial PLC I/O modules. IC Role / Device Role / Timing Role: Saturated PNP switch pulling output low when base driven high relative to emitter rail. Use Value: Delivers −65 V V_CEO margin and −90 mV V_CE(sat) to ensure clean logic transitions with <100 ns propagation delay.
High-Side Power Switch	Current Mirror Reference
Use Scenario: Controlling LED arrays or solenoid drivers referenced to positive supply rails in automotive body electronics. IC Role / Device Role / Timing Role: High-side PNP switch with emitter tied to V_CC, collector driving load to ground. Use Value: Supports −100 mA continuous load current and withstands load dump transients up to −65 V without clamping diodes.	Use Scenario: Establishing matched bias currents in discrete op-amp or comparator input stages requiring thermal tracking. IC Role / Device Role / Timing Role: One transistor in a monolithic-matched pair configuration (with BC556_J35Z variant or same batch). Use Value: h_FE tolerance (±10% within same h_FE class) and identical TO-92 thermal mass enable <0.5% current mismatch at ΔT ≤ 5 °C.

Audio Pre-amplifier Stage

Discrete Logic Level Shifter

Use Scenario: Amplifying low-level signals from electret microphones or piezoelectric sensors before ADC sampling.

IC Role / Device Role / Timing Role: PNP common-emitter voltage amplifier with emitter-degeneration bias for stable gain and low distortion.

Use Value: Achieves 2–10 dB noise figure and >100 kHz bandwidth while operating from single-supply rails (e.g., +5 V with emitter at V_CC).

Use Scenario: Translating 3.3 V logic outputs to −5 V or −12 V control lines in mixed-voltage industrial PLC I/O modules.

IC Role / Device Role / Timing Role: Saturated PNP switch pulling output low when base driven high relative to emitter rail.

Use Value: Delivers −65 V V_CEO margin and −90 mV V_CE(sat) to ensure clean logic transitions with <100 ns propagation delay.

High-Side Power Switch

Current Mirror Reference

Use Scenario: Controlling LED arrays or solenoid drivers referenced to positive supply rails in automotive body electronics.

IC Role / Device Role / Timing Role: High-side PNP switch with emitter tied to V_CC, collector driving load to ground.

Use Value: Supports −100 mA continuous load current and withstands load dump transients up to −65 V without clamping diodes.

Use Scenario: Establishing matched bias currents in discrete op-amp or comparator input stages requiring thermal tracking.

IC Role / Device Role / Timing Role: One transistor in a monolithic-matched pair configuration (with BC556_J35Z variant or same batch).

Use Value: h_FE tolerance (±10% within same h_FE class) and identical TO-92 thermal mass enable <0.5% current mismatch at ΔT ≤ 5 °C.

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
BC557BTA	V_CEO = −45 V (lower than BC556_J35Z's −65 V); otherwise identical h_FE, f_T, and package.	Suitable where system rail voltages remain ≤ −36 V; not recommended for −48 V telecom or industrial −60 V bus designs.	Select BC557BTA only if voltage margin is relaxed and cost sensitivity favors higher-volume BC557 variants.
BC856B, SOT-23	Same electrical specs (V_CEO = −65 V, h_FE = 200–450), but surface-mount SOT-23-3 package instead of through-hole TO-92.	Enables high-density PCB layouts and automated assembly; lacks TO-92 mechanical robustness for prototyping or vibration-prone environments.	Choose BC856B when board space is constrained and reflow compatibility is required; retain BC556_J35Z for hand-soldered prototypes or serviceable modules.

Compared with BC557BTA and BC856B, BC556_J35Z provides the highest voltage safety margin among through-hole PNP transistors in its family and remains the preferred choice for legacy-compatible designs requiring −65 V rating and TO-92 mechanical fit.

Availability

BC556_J35Z is available at Aetrix Electronics and suitable for industrial control panels, audio signal conditioning circuits, and discrete logic interface modules requiring stable component supply and long-term obsolescence management.

Supply support for BC556_J35Z 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The BC556_J35Z belongs to onsemi's legacy general-purpose bipolar transistor product line, engineered for reliability in cost-sensitive, high-volume applications such as power supplies, audio equipment, and industrial automation interfaces.

FAQ

What is the maximum collector-emitter voltage rating for BC556_J35Z?

The BC556_J35Z has a guaranteed V_CEO rating of −65 V at T_A = 25 °C, as specified in the Absolute Maximum Ratings table of the official onsemi datasheet (Rev. 3, June 2024). This rating applies to DC operation and defines the upper limit for safe collector-to-emitter reverse bias before breakdown. Exceeding this voltage risks permanent device failure.

Is BC556_J35Z RoHS compliant and lead-free?

Yes, BC556_J35Z is explicitly marked Pb-free, halogen-free/BFR-free, and RoHS compliant per the onsemi datasheet. The device uses lead-free termination finishes and complies with Directive 2011/65/EU, making it suitable for environmentally regulated end products including medical and consumer electronics.

What is the pin configuration of BC556_J35Z in TO-92-3 package?

When viewing the BC556_J35Z TO-92-3 package (Case 135AR) with the flat side facing you and leads pointing downward, the pin order from left to right is: Pin 1 = Collector, Pin 2 = Base, Pin 3 = Emitter. This matches the marking diagram and mechanical outline drawings in the official onsemi documentation.

Does BC556_J35Z support low-noise audio applications?

Yes, BC556_J35Z is characterized for low-noise operation with a noise figure (NF) of 2–10 dB at 1 kHz, V_CE = −5 V, I_C = −200 µA, and R_G = 2 kΩ - confirming suitability for microphone preamplifiers and sensor signal conditioning where signal integrity is critical.

How does BC556_J35Z differ from BC557 in practical circuit design?

BC556_J35Z offers −65 V V_CEO versus BC557's −45 V, making it mandatory for −48 V telecom or industrial −60 V bus applications. Both share identical TO-92-3 packaging and h_FE classification ranges, but BC556_J35Z's higher voltage rating eliminates need for external protection components in high-rail designs.

BC556_J35Z Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Packaging:: Bulk

Product Status:: Obsolete

Transistor Type:: PNP

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

Voltage - Collector Emitter Breakdown (Max):: 65 V

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

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 110 @ 2mA, 5V

Power - Max:: 500 mW

Frequency - Transition:: 150MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92-3

BC556_J35Z FAQ

1.How can I place an order for BC556_J35Z through Aetrix?

Please submit a Request for Quotation (RFQ) for BC556_J35Z 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 BC556_J35Z reliable?

The price and inventory of BC556_J35Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC556_J35Z is usually 5 days.

3.What payment methods are accepted for BC556_J35Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC556_J35Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC556_J35Z?

BC556_J35Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC556_J35Z 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 BC556_J35Z?

For technical support, including BC556_J35Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC556_J35Z requirements.

6.How does Aetrix verify that BC556_J35Z is sourced from the original manufacturer or authorized distributors?

All BC556_J35Z 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 BC556_J35Z meets industry standards.

7.What is the process for return or replacement of BC556_J35Z?

All BC556_J35Z units undergo pre-shipment inspection (PSI). If there is an issue with BC556_J35Z, 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 BC556_J35Z part is unused and in its original packaging.

Return procedure for BC556_J35Z:

1.Submit a request within 90 days.

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

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