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

onsemi BC639-16ZL1

Name: BC639-16ZL1
Brand: onsemi
SKU: BC639-16ZL1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BC639-16ZL1

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-226-3, TO-92-3 Long Body, Formed Leads

Datasheet:: BC639-16ZL1.pdf

Description:: TRANS NPN 80V 1A TO92

Quantity:: RFQ Add To RFQ list

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Inventory:5,762

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Product details

Overview

BC639-16ZL1 from onsemi is an NPN silicon general-purpose bipolar junction transistor (BJT) rated for 80 V_CEO, 1.0 A continuous collector current, and 625 mW power dissipation at T_A = 25°C, commonly used in linear amplification and switching applications in industrial control and power supply circuits.

For engineers reviewing the BC639-16ZL1 datasheet, pinout, applications, or equivalent options, key selection criteria include its guaranteed h_FE ≥ 40 at I_C = 500 mA, V_CE(sat) ≤ 0.5 V, f_T ≥ 200 MHz, and TO-92 package compatibility with legacy through-hole designs.

Technical Context

This device operates as a medium-power NPN BJT optimized for high-current switching and analog amplification. Its V_(BR)CES = 120 V ensures robustness under inductive load switching, while its h_FE range of 40–250 supports stable biasing across production lots.

The BC639-16ZL1 exhibits low output capacitance (C_ob = 7.0 pF) and input capacitance (C_ib = 50 pF), enabling use in moderate-frequency amplifier stages up to ~200 MHz, with thermal resistance R_JA = 200°C/W confirming suitability for ambient-temperature-limited PCB layouts.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	80 V - Maximum safe collector-emitter voltage before breakdown in open-base configuration
I_C (continuous)	1.0 A - Sustained collector current without thermal derating at 25°C ambient
h_FE (min)	40 - Minimum DC current gain at I_C = 500 mA, V_CE = 2 V, ensuring predictable base drive requirements
V_CE(sat)	≤ 0.5 V - Low saturation voltage at I_C = 500 mA, I_B = 50 mA, minimizing conduction loss in switch mode
f_T	≥ 200 MHz - Current-gain bandwidth product defining usable frequency limit for small-signal amplification
R_JA	200 °C/W - Junction-to-ambient thermal resistance, requiring heatsinking or airflow above ~300 mW dissipation

Pinout & Package

BC639-16ZL1 uses the TO-92 (Case 29, Style 14) plastic package with 3 leads, designed for through-hole mounting and manual soldering. Pin 1 is Emitter, Pin 2 is Collector, Pin 3 is Base - confirmed by ON Semiconductor's official marking diagram and package outline.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current exit path for majority carriers	Connected to ground or low-impedance return node; sets reference for base-emitter bias
2 (Collector)	Current entry path for majority carriers	Typically tied to load or supply rail; carries full switched/amplified output current
3 (Base)	Control terminal for carrier injection	Receives current-limited drive signal; determines operating region (cutoff/active/saturation)

Key Features

Feature	Design Value
High V_(BR)CES	120 V enables reliable switching of inductive loads without snubber networks in 24–48 V systems
Guaranteed h_FE minimum	h_FE ≥ 40 at I_C = 500 mA ensures consistent base drive design across manufacturing batches
Pb-free packaging	ZL1 suffix confirms RoHS-compliant lead finish and halogen-free molding compound
Low V_CE(sat)	≤ 0.5 V reduces power loss and self-heating during saturated switching operation

Applications

Industrial Relay Drivers	DC Motor Control Stages
Use Scenario: Driving 12–24 V relay coils with microcontroller GPIO outputs. IC Role / Device Role / Timing Role: NPN switch amplifying logic-level signals to energize relay solenoids. Use Value: V_CE(sat) ≤ 0.5 V minimizes coil voltage drop; h_FE ≥ 40 ensures <5 mA base drive suffices for 100 mA coil current.	Use Scenario: H-bridge half-bridge stage controlling bidirectional 24 V brushed DC motors. IC Role / Device Role / Timing Role: High-side or low-side switching element in discrete motor driver topology. Use Value: V_(BR)CES = 120 V withstands back-EMF spikes; TO-92 footprint allows compact layout in space-constrained modules.
Linear Voltage Regulator Pass Elements	Audio Pre-amplifier Stages
Use Scenario: Series pass transistor in adjustable 3-terminal linear regulators delivering up to 800 mA. IC Role / Device Role / Timing Role: Current-controlled active element regulating output voltage via feedback loop. Use Value: 1.0 A I_C rating supports >500 mA load current; f_T ≥ 200 MHz ensures stability with common compensation networks.	Use Scenario: First-stage small-signal amplifier in battery-powered audio mixers or sensor front-ends. IC Role / Device Role / Timing Role: Common-emitter voltage amplifier with emitter degeneration for linearity. Use Value: C_ib = 50 pF and C_ob = 7.0 pF limit Miller effect; h_FE consistency enables repeatable gain calibration.

Industrial Relay Drivers

DC Motor Control Stages

Use Scenario: Driving 12–24 V relay coils with microcontroller GPIO outputs.

IC Role / Device Role / Timing Role: NPN switch amplifying logic-level signals to energize relay solenoids.

Use Value: V_CE(sat) ≤ 0.5 V minimizes coil voltage drop; h_FE ≥ 40 ensures <5 mA base drive suffices for 100 mA coil current.

Use Scenario: H-bridge half-bridge stage controlling bidirectional 24 V brushed DC motors.

IC Role / Device Role / Timing Role: High-side or low-side switching element in discrete motor driver topology.

Use Value: V_(BR)CES = 120 V withstands back-EMF spikes; TO-92 footprint allows compact layout in space-constrained modules.

Linear Voltage Regulator Pass Elements

Audio Pre-amplifier Stages

Use Scenario: Series pass transistor in adjustable 3-terminal linear regulators delivering up to 800 mA.

IC Role / Device Role / Timing Role: Current-controlled active element regulating output voltage via feedback loop.

Use Value: 1.0 A I_C rating supports >500 mA load current; f_T ≥ 200 MHz ensures stability with common compensation networks.

Use Scenario: First-stage small-signal amplifier in battery-powered audio mixers or sensor front-ends.

IC Role / Device Role / Timing Role: Common-emitter voltage amplifier with emitter degeneration for linearity.

Use Value: C_ib = 50 pF and C_ob = 7.0 pF limit Miller effect; h_FE consistency enables repeatable gain calibration.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC639ZL1	Same TO-92 package, but V_CEO = 80 V and no guaranteed V_(BR)CES = 120 V rating; h_FE min = 40 at I_C = 150 mA only	Lacks guaranteed 120 V breakdown; less suitable for inductive switching with high flyback energy	Select BC639-16ZL1 when V_(BR)CES margin or high-current h_FE validation is required
MPSA42	Higher V_CEO = 300 V, lower I_C = 500 mA, TO-92 package, h_FE = 40–250 at I_C = 10 mA	Better for high-voltage, low-current applications; not rated for 1 A continuous operation	Choose MPSA42 only if voltage rating >100 V is primary requirement and current demand <500 mA

Compared with BC639ZL1 and MPSA42, BC639-16ZL1 uniquely combines 1 A current capability, 120 V V_(BR)CES, and validated h_FE ≥ 40 at 500 mA - making it optimal for robust, medium-power switching where both current and breakdown margin matter.

Availability

BC639-16ZL1 is available at Aetrix Electronics and suitable for industrial relay drivers, DC motor control stages, and linear voltage regulator pass elements requiring stable component supply and long-term manufacturability.

Supply support for BC639-16ZL1 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, sensors, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.

The BC639-16ZL1 belongs to onsemi's high-current general-purpose BJT family, engineered for reliability in industrial switching and linear amplification where cost-sensitive, through-hole-compatible transistors are needed.

FAQ

What is the maximum collector-emitter voltage rating for BC639-16ZL1?

The BC639-16ZL1 has a guaranteed V_CEO rating of 80 Vdc, meaning it can safely block up to 80 V between collector and emitter with the base open. This rating is confirmed in the Absolute Maximum Ratings table of the official ON Semiconductor datasheet (Rev. 5, September 2005).

Does BC639-16ZL1 have a specified collector-emitter breakdown voltage under saturation conditions?

Yes - the BC639-16ZL1 specifies V_(BR)CES = 120 Vdc (minimum) with base shorted to emitter, measured at I_C = 100 Adc. This parameter is explicitly listed in the OFF CHARACTERISTICS section and distinguishes BC639-16ZL1 from standard BC639 variants.

What is the DC current gain (h_FE) range for BC639-16ZL1 at 500 mA collector current?

The BC639-16ZL1 guarantees h_FE ≥ 40 at I_C = 500 mA, V_CE = 2.0 Vdc, with a typical value of 160 and maximum of 250. This specification appears in the ELECTRICAL CHARACTERISTICS table under "ON CHARACTERISTICS" and applies specifically to the -16 variant.

Is BC639-16ZL1 RoHS compliant and lead-free?

Yes - the "ZL1" suffix in BC639-16ZL1 denotes a Pb-free (RoHS-compliant) TO-92 package with halogen-free molding compound, as documented in ON Semiconductor's ordering information table and Pb-Free Packaging note on page 1 of the datasheet.

What is the thermal resistance from junction to ambient (R_JA) for BC639-16ZL1?

The BC639-16ZL1 has a maximum R_JA of 200°C/W when mounted on a standard FR-4 PCB with minimal copper area. This value is listed in the THERMAL CHARACTERISTICS table and defines the worst-case temperature rise per watt of dissipated power under natural convection.

BC639-16ZL1 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-226-3, TO-92-3 Long Body, Formed Leads

Packaging:: Tape & Box (TB)

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 1 A

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

Vce Saturation (Max) @ Ib, Ic:: 500mV @ 50mA, 500mA

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 150mA, 2V

Power - Max:: 625 mW

Frequency - Transition:: 200MHz

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92 (TO-226)

BC639-16ZL1 FAQ

1.How can I place an order for BC639-16ZL1 through Aetrix?

Please submit a Request for Quotation (RFQ) for BC639-16ZL1 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 BC639-16ZL1 reliable?

The price and inventory of BC639-16ZL1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC639-16ZL1 is usually 5 days.

3.What payment methods are accepted for BC639-16ZL1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC639-16ZL1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BC639-16ZL1?

BC639-16ZL1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BC639-16ZL1 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 BC639-16ZL1?

For technical support, including BC639-16ZL1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC639-16ZL1 requirements.

6.How does Aetrix verify that BC639-16ZL1 is sourced from the original manufacturer or authorized distributors?

All BC639-16ZL1 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 BC639-16ZL1 meets industry standards.

7.What is the process for return or replacement of BC639-16ZL1?

All BC639-16ZL1 units undergo pre-shipment inspection (PSI). If there is an issue with BC639-16ZL1, 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 BC639-16ZL1 part is unused and in its original packaging.

Return procedure for BC639-16ZL1:

1.Submit a request within 90 days.

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

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