2N6027 Programmable Unijunction Transistor 40V 150mW TO-92

2N6027 Programmable Unijunction Transistor 40V 150mW TO-92 is a versatile silicon-controlled switch designed primarily for use in pulse and timing circuits. Unlike a standard Unijunction Transistor (UJT), this device allows engineers to program key parameters such as the peak current, offset voltage, and valley current by simply adjusting two external resistors. Consequently, this programmable nature provides significantly more flexibility than traditional fixed UJTs. The 2N6027 functions efficiently as a relaxation oscillator or a thyristor trigger, offering a reliable solution for circuit designers who require precise control over triggering thresholds. Furthermore, its compact TO-92 package ensures that it occupies minimal board space while delivering robust performance in diverse electronic environments. Therefore, you can implement this device into your next project to achieve high-speed switching and stable timing with a very low component count.

Key Features:

• Programmable Characteristics: Users can easily program the intrinsic standoff ratio and other vital parameters using an external resistor divider network.
• High Voltage Rating: The device supports a maximum gate-to-cathode forward voltage of 40 V, making it suitable for a wide range of DC power applications.
• Low Leakage Current: It features an exceptionally low peak current and gate leakage, ensuring high precision in long-duration timing circuits.
• Fast Switching: The 2N6027 offers rapid rise times, which is essential for triggering SCRs or generating sharp pulses in oscillation circuits.
• Cost-Efficient Design: This device replaces more complex discrete circuits, effectively reducing the total bill of materials (BOM) for timing applications.

Technical Specifications:

• V_GK (Gate-Cathode Forward Voltage): 40 V
• V_AK (Anode-Cathode Voltage): 40 V
• I_T (DC Forward Current): 150 mA
• I_TRM (Repetitive Peak Forward Current): 1.0 A (20 μs pulse, 1% duty cycle)
• P_D (Total Power Dissipation): 300 mW (at T_A = 25°C)
• Operating Junction Temperature: −50°C to +100°C
• Peak Current (I_P): Typically 0.15 μA at V_S = 10 V

Mechanical Specifications:

• Package Type: TO-92 (Plastic Package)
• Lead Finish: Tinned leads for easy soldering
• Weight: ≈ 0.18 grams
• Flammability Rating: UL 94 V-0

Dimensions:

• Overall Height: ≈ 4.58 mm (excluding leads)
• Body Width: ≈ 4.58 mm
• Body Thickness: ≈ 3.86 mm
• Lead Length: ≥ 12.7 mm

Pinout and Wiring:

• Pin 1 (Anode): This pin acts as the primary input for the current that triggers the device.
• Pin 2 (Gate): Connect this pin to a resistive voltage divider to set the desired triggering voltage level.
• Pin 3 (Cathode): This pin serves as the common or output terminal, typically connected to the load or ground.
• Wiring Note: However, always ensure that the gate voltage remains stable, as fluctuations will directly impact the timing accuracy of your relaxation oscillator.

Datasheet Reference:

• Download ON Semiconductor 2N6027 PUT Datasheet

Commonly Used in:

• Relaxation Oscillators: Generating periodic waveforms for simple signal generation or blinking LED circuits.
• Thyristor Triggering: Providing the precise gate pulses required to activate high-power SCRs or TRIACs.
• Strobe Circuits: Controlling the frequency of flashes in strobe lights and warning beacons.

Applications:

• Timing Circuits: Building adjustable delay timers for industrial control and consumer electronics.
• Voltage Sensing: Monitoring voltage thresholds and triggering an action when a specific level is exceeded.
• Pulse Generation: Creating sharp, well-defined pulses for digital clocking or communication testing.

Equivalent Models:

• 2N6028: A similar Programmable Unijunction Transistor with slightly different current and voltage sensitivity specifications.
• NTE238: A common replacement model often used in repair and hobbyist applications.
• ECG238: A functionally identical part that follows the same PIN configurations and electronic characteristics.

Package Includes:

• 1 x 2N6027 Programmable Unijunction Transistor 40V 150mW TO-92