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onsemi KST05MTF
- Part No.:
- KST05MTF
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
KST05MTF.pdf
- Description:
- TRANS NPN 60V 0.5A SOT-23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,326
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Product details
Overview
KST05MTF from ON Semiconductor is an NPN epitaxial silicon transistor in SOT-23 package, rated for 60 V VCEO, 500 mA IC, and 350 mW PC. It delivers hFE ≥ 50 at IC = 10 mA, VCE = 1 V, and fT = 100 MHz, serving as a general-purpose driver transistor in low-power switching and signal amplification circuits.
For engineers reviewing the KST05MTF datasheet, pinout, applications, or equivalent options, key selection considerations include its 60 V collector-emitter breakdown voltage, 0.25 V VCE(sat) at IC = 100 mA / IB = 10 mA, thermal resistance of 357 °C/W, and SOT-23 footprint compatibility with space-constrained PCB layouts.
Technical Context
This discrete NPN transistor operates in linear or saturated switching modes with verified DC current gain (hFE) of 50 minimum at two bias points: IC = 10 mA and IC = 100 mA, both at VCE = 1 V. Its fT of 100 MHz confirms usable RF performance up to VHF band under specified test conditions (VCE = 2 V, IC = 100 mA).
Thermal design is constrained by RTH(j-a) = 357 °C/W in free-air conditions, requiring careful power derating above 25°C ambient. The device exhibits low leakage: ICEO ≤ 0.1 µA at VCE = 60 V and ICBO ≤ 0.1 µA at VCB = 60 V, supporting stable operation in battery-powered or high-impedance bias networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 60 V - Maximum allowable collector-emitter voltage before breakdown; defines safe operating range in switching applications. |
| IC | 500 mA - Continuous collector current limit; sets upper bound for load drive capability in driver stages. |
| PC | 350 mW - Maximum dissipation at TA = 25°C; requires thermal derating above ambient temperature. |
| hFE | ≥50 at IC = 10 mA, VCE = 1 V - Ensures reliable base drive efficiency in low-current amplification or logic interface roles. |
| VCE(sat) | 0.25 V at IC = 100 mA, IB = 10 mA - Low saturation voltage minimizes conduction loss in switching applications. |
| fT | 100 MHz - Current-gain bandwidth product; supports small-signal amplification up to VHF frequencies. |
Pinout & Package
SOT-23 plastic surface-mount package with gull-wing leads; standardized 3-pin configuration optimized for automated assembly and thermal performance in compact layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Base) | Control input terminal | Receives forward-biased current to enable conduction between Collector and Emitter; requires current-limiting resistor in most designs. |
| 2 (Emitter) | Current return path | Common reference node for bias network; connected to ground or low-side return in typical switch configurations. |
| 3 (Collector) | Output current terminal | Delivers switched or amplified current to load; must be rated for applied voltage and transient energy per application. |
Key Features
| Feature | Design Value |
|---|---|
| NPN epitaxial silicon structure | Enables fast switching and stable hFE across temperature; suitable for precision biasing and pulse applications. |
| VCEO = 60 V | Supports operation in 24–48 V industrial control rails and automotive 12 V systems with margin against transients. |
| VCE(sat) ≤ 0.25 V | Reduces power loss and self-heating during on-state operation, improving efficiency in high-duty-cycle drivers. |
| fT = 100 MHz | Validated for RF amplifier stages and high-speed digital interface buffering up to 30 MHz square-wave signals. |
Applications
| LED Driver Circuit | Microcontroller GPIO Expander |
|---|---|
Use Scenario: Driving multiple 20 mA indicator LEDs from a 3.3 V microcontroller output. IC Role / Device Role / Timing Role: Discrete NPN switch providing current gain and voltage level translation. Use Value: Enables direct LED control without external driver ICs; low VCE(sat) ensures minimal voltage drop and consistent brightness. |
Use Scenario: Amplifying weak sensor signals or enabling higher-current peripherals via MCU GPIO pins. IC Role / Device Role / Timing Role: Signal-level translator and current booster for interfacing with 5 V logic or relay coils. Use Value: hFE ≥ 50 allows single-stage gain sufficient to drive 100 mA loads with <10 mA base current, reducing firmware overhead. |
| Low-Voltage Power Switch | Signal Amplifier Stage |
Use Scenario: Controlling 12 V solenoid valves or small DC fans in embedded HVAC controllers. IC Role / Device Role / Timing Role: Medium-power switching element in low-side configuration. Use Value: 60 V VCEO accommodates inductive kickback suppression; 350 mW rating supports continuous 500 mA duty-cycled loads. |
Use Scenario: Boosting audio or sensor analog signals prior to ADC sampling in portable instrumentation. IC Role / Device Role / Timing Role: Class-A common-emitter amplifier stage with fixed bias. Use Value: fT = 100 MHz ensures flat gain response up to 10 MHz, preserving signal integrity in wideband measurement paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBT3904LT1G | VCEO = 40 V, hFE = 100–300 (min 100), PC = 225 mW | Lower voltage rating and power handling; narrower safe operating area at high IC | Preferred where higher hFE and tighter gain distribution are needed, but not for >40 V rail applications. |
| BC846B,215 | VCEO = 65 V, hFE = 200–450 (min 200), PC = 250 mW | Higher hFE and slightly higher VCEO, but lower power dissipation than KST05MTF | Selected when precise current amplification is prioritized over power handling in low-duty-cycle signal paths. |
Compared with MMBT3904LT1G and BC846B,215, the KST05MTF offers superior power dissipation (350 mW vs. ≤250 mW) and balanced VCEO/hFE trade-off for medium-current switching, making it more suitable for sustained 100–500 mA loads at 60 V.
Availability
KST05MTF is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller GPIO expansion, low-voltage power switching, and signal amplifier stages requiring stable component supply and consistent parametric performance across production batches.
Supply support for KST05MTF 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 manufacturer specializing in energy-efficient power management, analog, sensors, and discrete components for automotive, industrial, and consumer applications.
The KST05MTF belongs to ON Semiconductor's legacy Fairchild discrete transistor portfolio, designed specifically for cost-sensitive, space-constrained general-purpose switching and amplification in industrial controls and embedded systems.
FAQ
What is the maximum collector-emitter voltage rating for KST05MTF?
The KST05MTF has a maximum collector-emitter voltage (VCEO) rating of 60 V at TA = 25°C. This value is confirmed in the Absolute Maximum Ratings table and verified under pulsed test conditions. Exceeding this voltage risks avalanche breakdown and permanent device failure. Designers should apply appropriate derating for temperature and transient conditions when using KST05MTF in real-world circuits.
Does KST05MTF have a complementary PNP counterpart?
Yes, the KST05MTF is complemented by the KST55MTF (PNP), as explicitly stated in the "Complement to KST55/56" feature note. Both share identical SOT-23 packaging and matching voltage/current ratings (KST55MTF: VECO = 60 V, IC = −500 mA), enabling use in push-pull or differential pair configurations without layout redesign.
What is the typical DC current gain (hFE) of KST05MTF at 100 mA collector current?
The KST05MTF guarantees hFE ≥ 50 at VCE = 1 V and IC = 100 mA, per the Electrical Characteristics table. This minimum value ensures predictable base drive requirements in high-current switching applications. Actual measured hFE may vary between units but remains within the specified min/max bounds defined by ON Semiconductor's production testing.
Can KST05MTF be used in RF amplifier applications?
Yes, the KST05MTF is characterized with fT = 100 MHz at VCE = 2 V, IC = 100 mA, and f = 100 MHz, confirming usable gain-bandwidth performance for VHF-range amplification. It is suitable for low-power RF stages such as IF amplifiers or oscillator buffers, provided biasing and impedance matching align with the device's S-parameter behavior as documented in ON Semiconductor's application notes.
What is the thermal resistance junction-to-ambient (RTH(j-a)) for KST05MTF?
The KST05MTF has a thermal resistance junction-to-ambient (RTH(j-a)) of 357 °C/W under standard free-air test conditions. This value determines how much the junction temperature rises above ambient per milliwatt of dissipated power. For reliable long-term operation, designers must calculate actual power dissipation and ensure resulting TJ stays below the 150°C maximum storage temperature limit.
KST05MTF 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):
- 60 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
KST05MTF FAQ
1.How can I place an order for KST05MTF through Aetrix?
Please submit a Request for Quotation (RFQ) for KST05MTF 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 KST05MTF reliable?
The price and inventory of KST05MTF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KST05MTF is usually 5 days.
3.What payment methods are accepted for KST05MTF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KST05MTF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KST05MTF?
KST05MTF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KST05MTF 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 KST05MTF?
For technical support, including KST05MTF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KST05MTF requirements.
6.How does Aetrix verify that KST05MTF is sourced from the original manufacturer or authorized distributors?
All KST05MTF 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 KST05MTF meets industry standards.
7.What is the process for return or replacement of KST05MTF?
All KST05MTF units undergo pre-shipment inspection (PSI). If there is an issue with KST05MTF, 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 KST05MTF part is unused and in its original packaging.
Return procedure for KST05MTF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
KST05MTF Tags
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