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onsemi KST5401MTF
- Part No.:
- KST5401MTF
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
KST5401MTF.pdf
- Description:
- TRANS PNP 150V 0.5A SOT-23-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,920
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Product details
Overview
KST5401MTF from ON Semiconductor is a PNP epitaxial silicon transistor designed for high-voltage switching and amplification in low-power analog and digital circuits. It features -150 V VCEO, -500 mA IC, 350 mW PC, hFE of 50–240 at IC = -1.0 to -50 mA, and fT up to 300 MHz - enabling use in voltage regulation, relay drivers, and signal inversion stages.
For engineers reviewing the KST5401MTF datasheet, pinout, applications, or equivalent options, key selection criteria include verified PNP polarity, SOT-23 package compatibility, breakdown voltage margin above -150 V, saturation voltage under -0.5 V at -50 mA, and noise figure ≤8.0 dB in audio-frequency amplifiers.
Technical Context
The KST5401MTF operates as a general-purpose PNP bipolar junction transistor with epitaxial base construction for improved gain consistency and frequency response. Its -160 V VCBO and -150 V VCEO support operation in high-side switch configurations where collector potentials exceed -100 V relative to emitter.
Designed for DC and low-frequency AC applications, it delivers hFE ≥60 at IC = -10 mA and VCE = -5 V, with VCE(sat) ≤ -0.2 V at IC = -10 mA / IB = -1.0 mA - confirming suitability for saturated-switching logic interfaces and low-loss current sinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -150 V - supports collector-emitter blocking in high-side power control up to -150 V without breakdown |
| IC | -500 mA - enables driving moderate-current loads such as LEDs, small relays, or logic-level translators |
| PC | 350 mW - limits continuous dissipation in SOT-23 package; requires thermal derating above 25°C ambient |
| hFE | 50–240 - provides stable current amplification across IC = -1.0 to -50 mA, suitable for linear and switching bias design |
| fT | 100–300 MHz - confirms usable bandwidth for RF preamplifier stages and fast-switching applications up to ~100 MHz |
| VBE(sat) | -1.0 V - defines minimum base drive requirement for full saturation at IC = -10 to -50 mA |
| NF | 8.0 dB - specifies noise performance in low-level audio amplification (10 Hz–15.7 kHz) with 10 kΩ source impedance |
Pinout & Package
Package: SOT-23 (3-pin, surface-mount, JEDEC MO-215). Standardized footprint compatible with automated placement and reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control terminal; negative voltage relative to emitter required to forward-bias base-emitter junction and enable conduction |
| 2 | Emitter | Current source terminal; connected to higher potential (e.g., VCC) in high-side switch configurations |
| 3 | Collector | Current sink terminal; output node pulled toward ground or lower potential when transistor is saturated |
Key Features
| Feature | Design Value |
|---|---|
| High VCEO rating | -150 V enables use in off-line auxiliary supplies and industrial sensor interface circuits with elevated supply rails |
| Low VCE(sat) | ≤ -0.2 V at IC = -10 mA ensures minimal voltage drop and power loss in saturated switching applications |
| Wide hFE range | 50–240 supports consistent biasing across production lots without individual trimming in discrete amplifier designs |
| Low noise figure | 8.0 dB at 10 Hz–15.7 kHz allows integration into microphone preamps and instrumentation front-ends without added noise degradation |
Applications
| Audio Amplifier Stage | High-Voltage Switch Driver |
|---|---|
Use Scenario: Low-noise preamplification of electret microphone signals in portable voice recorders. IC Role / Device Role / Timing Role: PNP transistor configured in common-emitter topology for voltage gain and impedance transformation. Use Value: 8.0 dB noise figure and hFE ≥60 at µA-level IC preserve signal integrity while minimizing component count. | Use Scenario: Driving the gate of a high-side N-channel MOSFET in a buck converter's bootstrap circuit. IC Role / Device Role / Timing Role: Saturated PNP switch controlling charge pump enable/disable timing. Use Value: -150 V VCEO withstands transient spikes during MOSFET switching; -0.2 V VCE(sat) minimizes power loss in pulsed operation. |
| Relay Interface Circuit | Logic-Level Translator |
Use Scenario: Isolating microcontroller GPIO pins from 24 V industrial relay coils. IC Role / Device Role / Timing Role: Current-sinking switch turning on relay coil via emitter-follower or common-emitter configuration. Use Value: -500 mA IC rating safely handles typical 24 V/40 mA relay loads; SOT-23 footprint saves board space vs. through-hole alternatives. | Use Scenario: Converting 3.3 V CMOS logic outputs to -5 V TTL-compatible levels for legacy system interfacing. IC Role / Device Role / Timing Role: Inverting level shifter using fixed-base bias and open-collector output. Use Value: Fast fT >100 MHz ensures sub-10 ns propagation delay; -1.0 V VBE(sat) guarantees reliable turn-on with standard logic drive. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBT5401 | Same die, identical electrical specs; differs only in marking and packaging (tape-and-reel vs. bulk) | No functional difference; fully interchangeable in all circuit roles requiring KST5401MTF | Select MMBT5401 for automated SMT assembly with standard 7" tape-and-reel delivery |
| KSP5401 | TO-92 package; same VCEO, IC, hFE, but higher PC (625 mW) and larger thermal mass | Suitable for prototyping or low-volume through-hole builds; not SMT-compatible | Choose KSP5401 only when manual assembly or higher power dissipation (>350 mW) is required |
Compared with MMBT5401 and KSP5401, the KST5401MTF offers identical core transistor performance in the compact SOT-23 package optimized for high-density PCB layouts - making it the preferred choice for volume SMT production where footprint and thermal constraints are critical.
Availability
KST5401MTF is available at Aetrix Electronics and suitable for industrial control systems, audio signal conditioning circuits, and high-voltage interface modules requiring stable component supply and long-term manufacturability.
Supply support for KST5401MTF 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, and sensing solutions for automotive, industrial, and consumer markets.
The KST5401MTF belongs to ON Semiconductor's general-purpose bipolar transistor product line, engineered for reliability and consistency in discrete switching and amplification functions across cost-sensitive, high-volume applications.
FAQ
What is the maximum collector-emitter voltage rating for KST5401MTF?
The KST5401MTF has a maximum collector-emitter voltage (VCEO) rating of -150 V at TA = 25°C. This rating applies under specified test conditions (IC = -1.0 mA, IB = 0), and must be derated linearly with increasing ambient temperature per the datasheet's thermal characteristics. Exceeding this voltage risks avalanche breakdown and permanent device failure.
Is KST5401MTF pin-compatible with MMBT5401?
Yes, the KST5401MTF is pin-compatible with MMBT5401 - both use the SOT-23 package with identical pinout (1: Base, 2: Emitter, 3: Collector) and share identical absolute maximum ratings and electrical characteristics. The distinction lies solely in packaging format and part marking; no PCB layout changes are needed when substituting KST5401MTF for MMBT5401.
What is the typical DC current gain (hFE) of KST5401MTF at IC = -10 mA?
The typical DC current gain (hFE) of KST5401MTF at VCE = -5 V and IC = -10 mA is 60, with a guaranteed minimum of 50 and maximum of 240 across the production lot. This wide hFE range reflects process variation and must be accounted for in bias network design to ensure stable operation across temperature and unit-to-unit variance.
Can KST5401MTF be used in audio amplifier applications?
Yes, KST5401MTF is suitable for low-noise audio amplifier applications, particularly as a preamplifier stage. Its specified noise figure of 8.0 dB (at VCE = -5 V, IC = -200 µA, RS = 10 kΩ, 10 Hz–15.7 kHz) and stable hFE support clean signal amplification in microphone and sensor front-end circuits where discrete transistors are preferred over op-amps.
What is the package type and lead finish of KST5401MTF?
The KST5401MTF uses the SOT-23 surface-mount package with standard lead finish: matte tin (Sn) over nickel (Ni) underplate on copper alloy leads. This RoHS-compliant finish ensures reliable solderability with both leaded and lead-free reflow profiles, and meets J-STD-020 moisture sensitivity level (MSL) 1 requirements for unlimited floor life at <30°C/60% RH.
KST5401MTF 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:
- PNP
- Current - Collector (Ic) (Max):
- 500 mA
- Voltage - Collector Emitter Breakdown (Max):
- 150 V
- Vce Saturation (Max) @ Ib, Ic:
- 500mV @ 5mA, 50mA
- Current - Collector Cutoff (Max):
- 50nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 60 @ 50mA, 5V
- Power - Max:
- 350 mW
- Frequency - Transition:
- 300MHz
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
KST5401MTF FAQ
1.How can I place an order for KST5401MTF through Aetrix?
Please submit a Request for Quotation (RFQ) for KST5401MTF 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 KST5401MTF reliable?
The price and inventory of KST5401MTF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KST5401MTF is usually 5 days.
3.What payment methods are accepted for KST5401MTF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KST5401MTF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KST5401MTF?
KST5401MTF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KST5401MTF 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 KST5401MTF?
For technical support, including KST5401MTF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KST5401MTF requirements.
6.How does Aetrix verify that KST5401MTF is sourced from the original manufacturer or authorized distributors?
All KST5401MTF 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 KST5401MTF meets industry standards.
7.What is the process for return or replacement of KST5401MTF?
All KST5401MTF units undergo pre-shipment inspection (PSI). If there is an issue with KST5401MTF, 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 KST5401MTF part is unused and in its original packaging.
Return procedure for KST5401MTF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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