STMicroelectronics STN0214

Overview

STN0214 from STMicroelectronics is a very high voltage NPN power bipolar transistor designed for switching loads requiring sustained collector-emitter voltages up to 1200 V (VCEO) and 1400 V (VCES), with 200 mA DC collector current and 1.6 W total dissipation at 25 °C ambient. It targets haptic feedback actuators and high-voltage solenoid drivers where robust breakdown margin and controlled saturation behavior are critical.

For engineers reviewing the STN0214 datasheet, STN0214 pinout, STN0214 application, or STN0214 equivalent, key selection criteria include verified VCEO(sus) = 1200 V at IC = 1 mA, hFE = 20–300 across 1–200 mA, VCE(sat) ≤ 0.3 V at IC = 100 mA/IB = 20 mA, thermal resistance of 78 °C/W on 1 cm² PCB, and SOT-223 package compatibility with high-voltage layout constraints.

Technical Context

The STN0214 employs high-voltage diffused collector technology to achieve stable sustaining voltage under inductive load switching, with pulsed operation support (tP < 5 ms, ICM = 400 mA). Its base-emitter junction is rated for only 6 V reverse bias, requiring external clamping in driver circuits.

It operates with DC current gain strongly dependent on operating point: hFE ≥ 20 at IC = 1 mA/VCE = 2 V, but drops to ≥ 3 at IC = 200 mA/VCE = 2 V - indicating intentional design for high-voltage, moderate-current switching rather than linear amplification.

Key Specifications

Pinout & Package

Package: SOT-223 (4-pin variant with tab-connected collector). Mounting requires isolation of collector pad due to high-voltage potential.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage NPN switching applications.

Compared with BU508A and MJE13009, the STN0214 uniquely balances ultra-high voltage capability (1200 V sustain), SOT-223 surface-mount compatibility, and moderate power handling - making it optimal for space-constrained, high-reliability haptic and solenoid modules where TO-packaged alternatives introduce layout or thermal overhead.

Availability

STN0214 is available at Aetrix Electronics and suitable for haptic feedback systems, high-voltage solenoid drivers, capacitive discharge ignition modules, and high-isolation relay interfaces requiring stable component supply and long-term manufacturability.

Supply support for STN0214 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, Switzerland, designing and manufacturing analog, digital, and mixed-signal ICs and discrete devices for industrial, automotive, and consumer markets.

The STN0214 belongs to ST's high-voltage power transistor family, engineered specifically for ruggedized switching in electromechanical actuation systems where voltage endurance and package reliability outweigh raw current capacity.

FAQ

What is the maximum safe operating voltage for STN0214 in continuous DC blocking?

The STN0214 is rated for VCEO = 1200 V with IB = 0, meaning it can safely block up to 1200 V DC across collector-emitter when the base is open. This is its guaranteed sustaining voltage at IC = 1 mA per datasheet Table 4. Operation above this level risks avalanche breakdown and irreversible degradation.

Can STN0214 be used in linear amplifier configurations?

No - the STN0214 is not characterized or optimized for linear operation. Its hFE drops sharply above 10 mA (from ≥20 at 1 mA to ≥3 at 200 mA), and thermal resistance (78 °C/W) limits safe dissipation. It is specified exclusively for switching applications with defined pulse conditions and saturation biasing.

Is the SOT-223 tab electrically connected to the collector?

Yes - per Figure 1 and mechanical data, the exposed metal tab (pin 3) is internally connected to the collector. Pin 4 is a second collector terminal. Both must be treated as high-voltage nodes and electrically isolated from PCB ground planes or heatsinks unless the entire collector node is floated.

Does STN0214 require a base resistor when driven by a microcontroller GPIO?

Yes - direct GPIO connection risks exceeding IBM = 200 mA peak or damaging the base-emitter junction (VEBO = 6 V). A series base resistor must limit IB to ≤100 mA DC and ensure IB ≤ 20 mA during saturation (e.g., 220 Ω for 5 V drive), with optional reverse-biased clamp diode for inductive turn-off protection.