Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

STMicroelectronics ST600K

Name: ST600K
Brand: STMicroelectronics
SKU: ST600K
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: ST600K

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: TO-225AA, TO-126-3

Datasheet:: ST600K.pdf

Description:: TRANS NPN 120V 1A SOT-32-3

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:4,832

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

ST600K from STMicroelectronics is a low-voltage NPN power transistor manufactured using epitaxial base technology, rated for 120 V V_CEO, 1 A continuous collector current, and 12.5 W total dissipation at T_C = 25°C; it serves in medium-power linear and switching applications including CRT scanning velocity modulation.

For engineers reviewing the ST600K datasheet, ST600K pinout, ST600K application, or ST600K equivalent, key selection criteria include saturation voltage (V_CE(sat) = 0.5 V @ I_C = 500 mA), DC current gain (h_FE = 120–280), thermal resistance (R_thJ-case = 10 °C/W), and SOT-32 (TO-126) package compatibility with high-reliability analog and switching designs.

Technical Context

The ST600K operates as a single NPN bipolar junction transistor optimized for low-saturation switching and linear amplification in medium-power circuits. Its epitaxial base construction enables stable h_FE across I_C = 100–500 mA and V_CE = 5 V, with fast switching performance (t_on = 100 ns, t_off = 500 ns, t_s = 800 ns) under inductive load conditions.

Designed for operation up to 150°C junction temperature, it features low leakage (I_CBO ≤ 1 μA @ V_CB = 50 V) and robust breakdown ratings (V_(BR)CEO = 120 V, V_(BR)CBO = 120 V), supporting reliable use in CRT deflection stages and regulated power supplies where thermal stability and voltage margin are critical.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	120 V - supports operation in 100 V rail systems with 20% safety margin
I_C	1 A continuous - suitable for driver-stage loads in CRT horizontal deflection and SMPS output stages
V_CE(sat)	0.5 V @ I_C = 500 mA, I_B = 50 mA - minimizes conduction loss in linear and saturated switching modes
h_FE	120–280 @ I_C = 100–500 mA - ensures predictable base drive sizing across production lots
R_thJ-case	10 °C/W - enables 12.5 W dissipation with modest heatsinking in TO-126 footprint
t_off	500 ns @ inductive load - meets timing requirements for CRT scanning and PWM-driven solenoids

Pinout & Package

SOT-32 (equivalent to TO-126) plastic package with three terminals: emitter (pin 1), base (pin 2), collector (pin 3); case-connected collector for direct heatsink mounting and low-inductance thermal path.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current exit path for NPN operation	Low-impedance terminal tied to ground or low-side return; electrically isolated from heatsink
2 (Base)	Control input for minority-carrier injection	Requires 50 mA drive for full saturation at 500 mA collector current; sensitive to ESD
3 (Collector)	Main current input path and thermal interface	Internally connected to metal tab - must be mounted to heatsink; carries full load current and dissipates heat

Key Features

Feature	Design Value
Low V_CE(sat)	0.5 V enables <1.5 W conduction loss at 3 A peak (with forced beta), reducing heatsink size
High V_(BR)CEO	120 V rating supports operation in 100 V line-powered CRT and industrial control systems
Fast switching	800 ns storage time allows >100 kHz PWM operation in linear-regulated deflection circuits
ECOPACK® compliance	Lead-free second-level interconnect meets RoHS and JEDEC JESD97 marking requirements

Applications

CRT Horizontal Deflection

Linear Regulator Pass Element

Use Scenario: High-current, high-voltage switching in CRT horizontal output stage to generate sawtooth flyback waveform.

IC Role / Device Role / Timing Role: NPN power switch controlling primary winding current; synchronized to horizontal sync pulse.

Use Value: Low V_CE(sat) reduces power loss during conduction; 120 V rating withstands flyback spikes without snubber overdesign.

Use Scenario: Series pass transistor in adjustable linear power supply delivering up to 1 A at 12–24 V output.

IC Role / Device Role / Timing Role: Linear amplifier operating in active region; dissipates excess input-output voltage drop.

Use Value: Stable h_FE (120–280) simplifies feedback loop compensation; R_thJ-case = 10 °C/W supports compact heatsink design.

DC Motor Driver Stage

Inductive Load Switching

Use Scenario: Medium-power H-bridge low-side switch driving 24 V brushed DC motors in industrial actuators.

IC Role / Device Role / Timing Role: Saturated NPN switch turning motor current on/off at ≤20 kHz PWM frequency.

Use Value: Fast t_off (500 ns) and t_s (800 ns) minimize shoot-through risk and switching losses in bridge configurations.

Use Scenario: Solenoid and relay driver in programmable logic controllers requiring robust transient handling.

IC Role / Device Role / Timing Role: Inductive load switch clamped by external flyback diode; handles 2 A peak current pulses.

Use Value: I_CM = 2 A (t_P < 5 ms) supports short-duration surge currents without secondary breakdown.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD122	V_CEO = 100 V, V_CE(sat) = 0.8 V @ I_C = 500 mA, R_thJ-case = 12.5 °C/W	Lower voltage margin and higher saturation loss limit use in 80 V systems only	Prefer when cost sensitivity outweighs 20 V headroom and 0.3 V V_CE(sat) penalty
BD139	V_CEO = 80 V, h_FE = 40–250, R_thJ-case = 15 °C/W, TO-126 package	Reduced voltage rating and thermal performance restrict use to ≤60 V, ≤0.8 A continuous loads	Select only for legacy board replacements where 80 V rating suffices and thermal budget permits larger heatsink

Compared with MJD122 and BD139, the ST600K delivers superior voltage margin (120 V), lower conduction loss (0.5 V vs. ≥0.8 V), and better thermal efficiency (10 vs. ≥12.5 °C/W), making it optimal for CRT deflection and 100 V industrial switching where reliability under transient stress is critical.

Availability

ST600K is available at Aetrix Electronics and suitable for CRT display systems, linear power regulators, DC motor drivers, and industrial solenoid controllers requiring stable component supply and long-lifecycle support.

Supply support for ST600K 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, specializing in power devices, microcontrollers, sensors, and automotive ICs with broad industrial and consumer reach.

The ST600K belongs to ST's legacy bipolar power transistor family, engineered specifically for high-reliability analog switching and linear amplification in display, power conversion, and electromechanical control systems.

FAQ

Is the ST600K RoHS-compliant?

Yes, the ST600K is supplied in an ECOPACK® package with lead-free second-level interconnect, compliant with RoHS Directive 2011/65/EU and marked per JEDEC Standard JESD97. The inner box label specifies the lead-free category and maximum soldering temperature limits.

What is the recommended heatsink interface for the ST600K?

The collector (pin 3) is internally connected to the metal tab, requiring direct mechanical and thermal contact with a heatsink. Use thermally conductive insulating pads or silicone grease with mounting torque of 0.5–0.7 N·m; avoid insulating washers that impede thermal transfer, as R_thJ-case = 10 °C/W assumes optimal metal-to-metal contact.

Can the ST600K replace the ST631K in a circuit?

No - the ST631K is the complementary PNP device, not a functional substitute. Swapping NPN for PNP would invert logic polarity and reverse current flow direction. For push-pull or complementary pair designs, both devices are used together; standalone replacement requires redesign of biasing and signal paths.

Does the ST600K support pulsed operation beyond its DC ratings?

Yes - absolute maximum ratings specify I_CM = 2 A for pulse widths <5 ms and duty cycle ≤1.5%, enabling short-duration surge handling in motor startup or solenoid pull-in. Ensure pulse energy stays within SOA limits and junction temperature remains ≤150°C using thermal modeling or derating curves from the datasheet.

ST600K Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-225AA, TO-126-3

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: NPN

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

Voltage - Collector Emitter Breakdown (Max):: 120 V

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

Current - Collector Cutoff (Max):: 1µA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 120 @ 100mA, 5V

Power - Max:: 12.5 W

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: SOT-32-3

ST600K FAQ

1.How can I place an order for ST600K through Aetrix?

Please submit a Request for Quotation (RFQ) for ST600K 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 ST600K reliable?

The price and inventory of ST600K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST600K is usually 5 days.

3.What payment methods are accepted for ST600K?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST600K transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ST600K?

ST600K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ST600K 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 ST600K?

For technical support, including ST600K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST600K requirements.

6.How does Aetrix verify that ST600K is sourced from the original manufacturer or authorized distributors?

All ST600K 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 ST600K meets industry standards.

7.What is the process for return or replacement of ST600K?

All ST600K units undergo pre-shipment inspection (PSI). If there is an issue with ST600K, 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 ST600K part is unused and in its original packaging.

Return procedure for ST600K:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…