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

onsemi BSS64

Name: BSS64
Brand: onsemi
SKU: BSS64
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BSS64

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: BSS64.pdf

Description:: TRANS NPN 80V 0.2A SOT-23-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BSS64 from ON Semiconductor is an NPN general-purpose amplifier optimized for high-voltage amplification and gas discharge display driving, featuring V_CEO = 80 V, V_CBO = 120 V, I_C = 200 mA continuous, h_FE = 20 at I_C = 10 mA/V_CE = 1.0 V, and f_T = 60 MHz - deployed in industrial indicator drivers and HV bias circuits.

For engineers reviewing the BSS64 datasheet, pinout, applications, or equivalent options, key selection considerations include its SOT-23 package, 150°C max junction temperature, low V_CE(sat) (0.15 V @ 4 mA/400 µA), Cob = 5.0 pF, and suitability for pulsed HV switching where thermal derating above 25°C must be applied.

Technical Context

The BSS64 is a silicon NPN bipolar junction transistor fabricated on Fairchild's Process 16, designed for stable DC amplification and moderate-frequency switching up to 60 MHz. Its high V_CBO (120 V) and V_CEO (80 V) support operation in elevated-voltage bias rails, while its 350 mW power dissipation at 25°C and 2.8 mW/°C derating enable use in thermally constrained SOT-23 layouts.

It exhibits predictable gain behavior across temperature (–40°C to +125°C), with h_FE maintained ≥20 under specified conditions and V_BE(sat) = 1.2 V at I_C = 4 mA/IB = 400 µA. The device is not rated for life-support or implantable medical applications per ON Semiconductor's policy.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	80 V - supports collector-emitter bias up to 80 V without breakdown, suitable for HV display anode drivers.
I_C (continuous)	200 mA - enables direct drive of medium-current loads like neon indicators or small relays without external buffering.
h_FE	20 min @ I_C = 10 mA, V_CE = 1.0 V - provides predictable current amplification for linear biasing networks.
f_T	60 MHz - allows use in low-to-moderate frequency signal amplification and fast-switching applications up to ~10 MHz.
V_CE(sat)	0.15 V @ I_C = 4 mA / I_B = 400 µA - minimizes conduction loss in saturated-switch configurations.
R_θJA	357 °C/W - requires careful PCB copper area design (e.g., 40 mm × 40 mm FR-4 pad) to maintain T_J ≤ 150°C.

Pinout & Package

SOT-23 plastic surface-mount package (3-pin, standard JEDEC MO-178AA); marked "U3"; lead-free and RoHS compliant per ON Semiconductor documentation.

Pin/Terminal	Circuit Role	Design Meaning
E (Emitter)	Current sink terminal	Connected to ground or low-side return path; sets reference for base bias and collector current flow.
B (Base)	Control input	Receives forward-biased current to turn on transistor; requires series resistor to limit I_B per h_FE target.
C (Collector)	High-voltage output terminal	Drives load between V_CC (up to 80 V) and collector; handles full I_C and associated power dissipation.

Key Features

Feature	Design Value
High V_CBO (120 V)	Enables safe operation with collector-base reverse bias in HV common-emitter configurations.
Low V_CE(sat) (0.15 V)	Reduces power loss and self-heating during saturation, critical for thermally limited SOT-23 designs.
150°C max junction temperature	Supports deployment in industrial environments with extended ambient temperature ranges.
60 MHz f_T	Permits use in audio preamplifiers, pulse generators, and display scan drivers requiring bandwidth beyond DC.

Applications

Gas Discharge Display Driver	High-Voltage Bias Amplifier
Use Scenario: Driving individual segments of neon or Nixie tube displays requiring 60–100 V anode voltage and 1–5 mA segment current. IC Role / Device Role / Timing Role: NPN switch amplifying microcontroller GPIO logic to control HV segment current. Use Value: Leverages V_CEO = 80 V and I_C = 200 mA to directly source segment current without external HV transistors.	Use Scenario: Generating stable, adjustable bias voltages (e.g., 40–75 V) for photomultiplier tubes or vacuum sensor grids. IC Role / Device Role / Timing Role: Linear amplifier in emitter-follower or common-emitter configuration with precision base bias network. Use Value: Uses h_FE = 20 and low V_CE(sat) to minimize regulation error and improve load regulation under varying current draw.
Industrial Indicator Interface	Pulsed HV Switching Circuit
Use Scenario: Isolating and amplifying PLC output signals to drive 24–48 V LED stacks or incandescent pilot lamps. IC Role / Device Role / Timing Role: General-purpose switching transistor interfacing low-voltage logic to higher-power indicators. Use Value: Delivers reliable 200 mA switching with robust ESD tolerance and 150°C operating range for factory-floor reliability.	Use Scenario: Generating short-duration HV pulses (e.g., for spark-gap triggers or piezo actuators) with <10 µs rise time. IC Role / Device Role / Timing Role: Fast-switching NPN in grounded-emitter topology with minimal Cob (5.0 pF) to preserve edge fidelity. Use Value: Achieves 60 MHz f_T and low C_ob to support clean pulse edges up to ~5 MHz repetition rates.

Gas Discharge Display Driver

High-Voltage Bias Amplifier

Use Scenario: Driving individual segments of neon or Nixie tube displays requiring 60–100 V anode voltage and 1–5 mA segment current.

IC Role / Device Role / Timing Role: NPN switch amplifying microcontroller GPIO logic to control HV segment current.

Use Value: Leverages V_CEO = 80 V and I_C = 200 mA to directly source segment current without external HV transistors.

Use Scenario: Generating stable, adjustable bias voltages (e.g., 40–75 V) for photomultiplier tubes or vacuum sensor grids.

IC Role / Device Role / Timing Role: Linear amplifier in emitter-follower or common-emitter configuration with precision base bias network.

Use Value: Uses h_FE = 20 and low V_CE(sat) to minimize regulation error and improve load regulation under varying current draw.

Industrial Indicator Interface

Pulsed HV Switching Circuit

Use Scenario: Isolating and amplifying PLC output signals to drive 24–48 V LED stacks or incandescent pilot lamps.

IC Role / Device Role / Timing Role: General-purpose switching transistor interfacing low-voltage logic to higher-power indicators.

Use Value: Delivers reliable 200 mA switching with robust ESD tolerance and 150°C operating range for factory-floor reliability.

Use Scenario: Generating short-duration HV pulses (e.g., for spark-gap triggers or piezo actuators) with <10 µs rise time.

IC Role / Device Role / Timing Role: Fast-switching NPN in grounded-emitter topology with minimal Cob (5.0 pF) to preserve edge fidelity.

Use Value: Achieves 60 MHz f_T and low C_ob to support clean pulse edges up to ~5 MHz repetition rates.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN general-purpose amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBT6427	V_CEO = 60 V (lower than BSS64's 80 V); h_FE = 35 min; SOT-23 package identical.	Limited to ≤60 V collector circuits; better suited for lower-voltage logic-level switching.	Select when V_CC ≤ 60 V and higher h_FE is prioritized over HV capability.
ZTX653	V_CEO = 100 V (higher); I_C = 1 A (much higher); TO-92 package (not SOT-23).	Requires PCB layout change; supports higher current but larger footprint and thermal mass.	Choose only if >200 mA drive or >80 V operation is required and SOT-23 size constraint is relaxed.

Compared with MMBT6427 and ZTX653, the BSS64 uniquely balances 80 V rating, SOT-23 compactness, and 200 mA capability - making it optimal for space-constrained HV indicator and display driver designs where neither lower-voltage nor through-hole alternatives suffice.

Availability

BSS64 is available at Aetrix Electronics and suitable for gas discharge display drivers, industrial indicator interfaces, and high-voltage bias amplifiers requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for BSS64 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

ON Semiconductor (formerly Fairchild Semiconductor) is a global semiconductor manufacturer specializing in power management, analog, sensors, and discrete devices for automotive, industrial, and consumer markets.

The BSS64 belongs to ON Semiconductor's general-purpose bipolar transistor product line, engineered for cost-effective, reliable HV amplification and switching in space-constrained industrial and display applications.

FAQ

What is the maximum collector-emitter voltage rating for the BSS64?

The BSS64 has a maximum collector-emitter voltage (V_CEO) rating of 80 V at T_A = 25°C. This rating ensures safe operation in high-voltage display driver and bias amplifier circuits. Exceeding this voltage risks avalanche breakdown. Derating is not specified for V_CEO, so 80 V remains the absolute limit across the full –55°C to +150°C junction temperature range. The BSS64 datasheet confirms this value under Absolute Maximum Ratings.

Does the BSS64 have a documented pinout for the SOT-23 package?

Yes, the BSS64 uses the standard SOT-23 pinout: Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector - confirmed by ON Semiconductor's official datasheet diagram and marking "U3" orientation. This matches JEDEC MO-178AA mechanical specifications. No alternate pinouts or variants are documented for the BSS64; all released revisions (Rev. G) consistently define this arrangement.

What is the thermal resistance (R_θJA) of the BSS64, and how does it affect PCB layout?

The BSS64 has a junction-to-ambient thermal resistance (R_θJA) of 357 °C/W when mounted on a 40 mm × 40 mm × 1.5 mm FR-4 PCB. This high value means even modest power dissipation (e.g., 100 mW) raises junction temperature significantly. To maintain T_J ≤ 150°C, designers must add thermal relief pads, copper pours, or reduce ambient temperature - especially since derating is 2.8 mW/°C above 25°C.

Can the BSS64 be used in linear amplifier configurations?

Yes, the BSS64 is characterized for linear operation with verified h_FE = 20 at I_C = 10 mA/V_CE = 1.0 V and stable gain vs. temperature curves. Its f_T = 60 MHz and low Cob = 5.0 pF support audio and low-MHz signal amplification. However, due to its 350 mW P_D limit and thermal resistance, linear use requires strict attention to quiescent power and heatsinking - unlike dedicated RF or audio transistors.

Is the BSS64 suitable for automotive applications?

The BSS64 is not AEC-Q101 qualified and lacks automotive-grade screening, temperature cycling, or failure-in-time (FIT) data in its official documentation. While its –55°C to +150°C operating range overlaps automotive under-hood requirements, ON Semiconductor explicitly states it is intended for industrial and general-purpose use - not safety-critical or automotive systems. For automotive designs, qualified alternatives like the NSS6427MUTX should be considered instead of the BSS64.

BSS64 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 200 mA

Voltage - Collector Emitter Breakdown (Max):: 80 V

Vce Saturation (Max) @ Ib, Ic:: 200mV @ 15mA, 50mA

Current - Collector Cutoff (Max):: 100nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 20 @ 10mA, 1V

Power - Max:: 350 mW

Frequency - Transition:: 60MHz

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

BSS64 FAQ

1.How can I place an order for BSS64 through Aetrix?

Please submit a Request for Quotation (RFQ) for BSS64 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 BSS64 reliable?

The price and inventory of BSS64 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BSS64 is usually 5 days.

3.What payment methods are accepted for BSS64?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BSS64 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BSS64?

BSS64 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BSS64 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 BSS64?

For technical support, including BSS64 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BSS64 requirements.

6.How does Aetrix verify that BSS64 is sourced from the original manufacturer or authorized distributors?

All BSS64 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 BSS64 meets industry standards.

7.What is the process for return or replacement of BSS64?

All BSS64 units undergo pre-shipment inspection (PSI). If there is an issue with BSS64, 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 BSS64 part is unused and in its original packaging.

Return procedure for BSS64:

1.Submit a request within 90 days.

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

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