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

onsemi KST06MTF

Name: KST06MTF
Brand: onsemi
SKU: KST06MTF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: KST06MTF

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: KST06MTF.pdf

Description:: TRANS NPN 80V 0.5A SOT-23-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

KST06MTF from ON Semiconductor is an NPN epitaxial silicon transistor in SOT-23 package, rated for 80 V collector-emitter voltage (V_CEO), 500 mA continuous collector current (I_C), and 350 mW power dissipation. It delivers DC current gain (h_FE) ≥50 at I_C = 10 mA and V_CE = 1 V, with f_T = 100 MHz, and serves as a general-purpose driver transistor in low-voltage switching and signal amplification circuits.

For engineers reviewing the KST06MTF datasheet, pinout, applications, or equivalent options, key selection criteria include its 80 V V_CEO, 0.25 V V_CE(sat) at I_C = 100 mA / I_B = 10 mA, SOT-23 footprint compatibility, thermal resistance of 357 °C/W, and complementarity to KST56 in push-pull configurations.

Technical Context

This discrete NPN transistor operates in linear or saturated switching modes with verified breakdown ratings: V_CBO = 80 V, V_CEO = 80 V, and V_EBO = 4 V. Its h_FE remains ≥50 across I_C = 10–100 mA at V_CE = 1 V, and it achieves 100 MHz current-gain bandwidth under standard RF test conditions (V_CE = 2 V, I_C = 100 mA).

The device exhibits low saturation voltage (V_CE(sat) ≤ 0.25 V) and base-emitter on voltage (V_BE(on) ≈ 1.2 V) at I_C = 100 mA, enabling efficient drive in compact logic-level interface and LED driver stages. Its SOT-23 package supports surface-mount assembly with defined thermal path to ambient (R_TH(j-a) = 357 °C/W).

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	80 V - Maximum safe collector-emitter voltage before breakdown; enables use in 48 V supply rails and higher-voltage logic interfaces.
I_C	500 mA - Continuous collector current rating; supports moderate-power switching loads such as relays, small solenoids, and indicator LEDs.
P_C	350 mW - Max junction power dissipation at T_A = 25°C; defines thermal derating limit for PCB layout and ambient temperature planning.
h_FE	≥50 @ I_C = 10 mA, V_CE = 1 V - Minimum DC current gain ensures reliable base drive sizing for predictable saturation in switching applications.
f_T	100 MHz - Current-gain bandwidth product; confirms suitability for audio-frequency amplification and fast digital signal buffering up to ~10 MHz.
V_CE(sat)	≤0.25 V @ I_C = 100 mA, I_B = 10 mA - Low saturation voltage minimizes conduction loss and self-heating in high-duty-cycle switching.

Pinout & Package

SOT-23 plastic surface-mount package with 3-pin configuration: compact 2.90 mm × 1.30 mm footprint, 0.95 mm pin pitch, and gull-wing leads compatible with standard reflow profiles.

Pin/Terminal	Circuit Role	Design Meaning
1 (Base)	Control input terminal	Receives base current to bias transistor into active or saturation region; requires current-limiting resistor when driven from logic outputs.
2 (Emitter)	Current return path	Connected to ground or low-side reference; establishes common node for current flow and defines emitter-follower or common-emitter topology.
3 (Collector)	Output current terminal	Switches load between supply rail and emitter; must be routed with adequate trace width to handle 500 mA peak current.

Key Features

Feature	Design Value
High V_CEO rating	80 V enables robust operation in industrial control inputs, automotive body electronics, and 24–48 V bus interfaces without external clamping.
Low V_CE(sat)	≤0.25 V reduces power loss and thermal stress in high-duty-cycle switching, improving efficiency in LED drivers and relay coils.
SOT-23 footprint	Standardized 3-pin package allows drop-in replacement in space-constrained designs and supports automated pick-and-place assembly.
Complementary pairing	Designed as NPN counterpart to KST56 (PNP), facilitating matched push-pull output stages in analog and digital line drivers.

Applications

LED Driver Stage	Logic-Level Interface
Use Scenario: Driving high-brightness indicator LEDs from 3.3 V or 5 V microcontroller GPIO pins. IC Role / Device Role / Timing Role: NPN switch controlling LED anode-to-V_CC or cathode-to-ground current path. Use Value: 0.25 V V_CE(sat) preserves >95% of supply voltage across LED, maximizing luminance while limiting junction heating.	Use Scenario: Level-shifting 1.8 V/3.3 V logic signals to 5 V/12 V peripheral control lines. IC Role / Device Role / Timing Role: Single-transistor open-collector or common-emitter level translator. Use Value: 100 MHz f_T supports clean edge integrity up to 10 MHz data rates; 80 V V_CEO accommodates diverse target supply rails.
Relay Coil Driver	Small-Signal Amplifier
Use Scenario: Switching 24 V DC relay coils drawing up to 400 mA in building automation controllers. IC Role / Device Role / Timing Role: Saturated switch providing low-resistance path between coil and ground. Use Value: 500 mA I_C rating and 350 mW P_C allow sustained activation without thermal shutdown in typical 1 s on-time duty cycles.	Use Scenario: Pre-amplifying weak sensor signals (e.g., thermistor bridges, photodiode currents) in portable instrumentation. IC Role / Device Role / Timing Role: Common-emitter amplifier stage with fixed bias or emitter degeneration. Use Value: h_FE ≥50 ensures stable gain setting with minimal base current error; 100 MHz f_T maintains flat response through audio band.

LED Driver Stage

Logic-Level Interface

Use Scenario: Driving high-brightness indicator LEDs from 3.3 V or 5 V microcontroller GPIO pins.

IC Role / Device Role / Timing Role: NPN switch controlling LED anode-to-V_CC or cathode-to-ground current path.

Use Value: 0.25 V V_CE(sat) preserves >95% of supply voltage across LED, maximizing luminance while limiting junction heating.

Use Scenario: Level-shifting 1.8 V/3.3 V logic signals to 5 V/12 V peripheral control lines.

IC Role / Device Role / Timing Role: Single-transistor open-collector or common-emitter level translator.

Use Value: 100 MHz f_T supports clean edge integrity up to 10 MHz data rates; 80 V V_CEO accommodates diverse target supply rails.

Relay Coil Driver

Small-Signal Amplifier

Use Scenario: Switching 24 V DC relay coils drawing up to 400 mA in building automation controllers.

IC Role / Device Role / Timing Role: Saturated switch providing low-resistance path between coil and ground.

Use Value: 500 mA I_C rating and 350 mW P_C allow sustained activation without thermal shutdown in typical 1 s on-time duty cycles.

Use Scenario: Pre-amplifying weak sensor signals (e.g., thermistor bridges, photodiode currents) in portable instrumentation.

IC Role / Device Role / Timing Role: Common-emitter amplifier stage with fixed bias or emitter degeneration.

Use Value: h_FE ≥50 ensures stable gain setting with minimal base current error; 100 MHz f_T maintains flat response through audio band.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBT3904LT1G	V_CEO = 40 V, I_C = 200 mA, h_FE = 100–300 - lower voltage/current rating, higher gain variability.	Not suitable for 48 V systems or >200 mA loads; better for low-power signal amplification than switching.	Select only if design operates below 40 V and requires higher h_FE consistency at low I_C.
BC846B,215	V_CEO = 65 V, I_C = 100 mA, h_FE = 200–450 - narrower voltage margin, significantly lower current capability.	Limited to sub-100 mA loads; insufficient for relay or high-current LED driving.	Preferable only in ultra-low-power bias networks where gain precision outweighs voltage headroom needs.

Compared with MMBT3904LT1G and BC846B,215, the KST06MTF provides superior voltage margin (80 V), higher continuous current (500 mA), and tighter saturation performance (0.25 V), making it uniquely suited for industrial 24–48 V interface and medium-power switching where reliability under sustained load is critical.

Availability

KST06MTF is available at Aetrix Electronics and suitable for LED driver stages, logic-level interfaces, relay coil drivers, and small-signal amplifiers requiring stable component supply, consistent parametric performance, and long-term industrial availability.

Supply support for KST06MTF 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 is a global semiconductor supplier specializing in energy-efficient power management, analog, sensors, and discrete devices for automotive, industrial, cloud computing, and consumer markets.

The KST06MTF belongs to ON Semiconductor's legacy Fairchild discrete transistor portfolio, engineered for cost-effective, high-reliability general-purpose switching and amplification in space- and power-constrained applications.

FAQ

What is the maximum collector-emitter voltage rating for KST06MTF?

The KST06MTF has a guaranteed minimum collector-emitter breakdown voltage (V_CEO) of 80 V at I_C = 1 mA and I_B = 0. This rating is validated per absolute maximum specifications and defines the upper limit for safe operation in switching or linear mode. Exceeding 80 V risks irreversible avalanche failure. The KST06MTF should not be used in circuits where transient spikes could breach this threshold without external clamping.

Does KST06MTF have a documented pinout configuration for SOT-23?

Yes, the KST06MTF uses standard SOT-23 pinout: Pin 1 is Base, Pin 2 is Emitter, Pin 3 is Collector - confirmed by Fairchild's original package drawing and ON Semiconductor's updated documentation. This matches JEDEC MO-178AB and is consistent across all KST05/KST06 variants. No orientation ambiguity exists; the marking "1G" appears adjacent to Pin 1.

Can KST06MTF replace KST05MTF in existing designs?

Yes, the KST06MTF is a direct functional upgrade to KST05MTF with identical SOT-23 package, pinout, and thermal characteristics, but offers higher V_CEO (80 V vs. 60 V) and V_CBO. All other electrical parameters - including h_FE, V_CE(sat), f_T, and power dissipation - are identical. No PCB or schematic changes are required when substituting KST06MTF for KST05MTF.

What is the thermal resistance junction-to-ambient for KST06MTF?

The KST06MTF has a specified thermal resistance junction-to-ambient (R_TH(j-a)) of 357 °C/W under standard JEDEC test conditions (single-layer FR-4, no copper pour). This value assumes minimal PCB copper area and guides thermal derating: at 25°C ambient, max continuous power drops to ~200 mW at 70°C case temperature. Layout with thermal pads improves actual performance.

Is KST06MTF RoHS compliant and lead-free?

Yes, KST06MTF is RoHS compliant and lead-free, as confirmed by ON Semiconductor's official product change notices and material declarations. The device meets EU Directive 2011/65/EU and subsequent amendments, with homogeneous lead content < 1000 ppm. Packaging markings and datasheets reflect Pb-free status, and the SOT-23 terminations use matte tin plating.

KST06MTF 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):: 500 mA

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

Vce Saturation (Max) @ Ib, Ic:: 250mV @ 10mA, 100mA

Current - Collector Cutoff (Max):: 100nA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 50 @ 100mA, 1V

Power - Max:: 350 mW

Frequency - Transition:: 100MHz

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

KST06MTF FAQ

1.How can I place an order for KST06MTF through Aetrix?

Please submit a Request for Quotation (RFQ) for KST06MTF 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 KST06MTF reliable?

The price and inventory of KST06MTF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KST06MTF is usually 5 days.

3.What payment methods are accepted for KST06MTF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KST06MTF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for KST06MTF?

KST06MTF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your KST06MTF 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 KST06MTF?

For technical support, including KST06MTF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KST06MTF requirements.

6.How does Aetrix verify that KST06MTF is sourced from the original manufacturer or authorized distributors?

All KST06MTF 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 KST06MTF meets industry standards.

7.What is the process for return or replacement of KST06MTF?

All KST06MTF units undergo pre-shipment inspection (PSI). If there is an issue with KST06MTF, 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 KST06MTF part is unused and in its original packaging.

Return procedure for KST06MTF:

1.Submit a request within 90 days.

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

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