STMicroelectronics STRVS185X02E

Overview

STRVS185X02E from STMicroelectronics is a unidirectional repetitive voltage suppressor (TVS) diode designed for clamping transient overvoltages in power semiconductor protection circuits. It features a 185 V clamping voltage at 2 A peak pulse current (125 °C), 128–158 V breakdown voltage range, and 0.2 µA max leakage at 25 °C, housed in DO-15 package with 175 °C max junction temperature - used specifically for MOSFET/IGBT protection in flyback auxiliary supplies.

For engineers reviewing the STRVS185X02E datasheet, STRVS185X02E pinout, STRVS185X02E application, or STRVS185X02E equivalent, key selection criteria include clamping voltage stability across temperature (25–125 °C), low leakage under stand-off conditions, thermal resistance (R_th(j-a) = 105 °C/W on recommended PCB layout), and compliance with IEC 61000-4-2 level 4 (±15 kV air / ±8 kV contact discharge).

Technical Context

The STRVS185X02E operates as a unidirectional avalanche diode with defined clamping behavior across –55 to +175 °C junction temperature range. Its dynamic resistance (R_d) is 2.5 Ω, derived from V_CL – V_CL0 / I_PP, enabling predictable voltage limiting during repetitive surges up to 2 A.

It meets MIL-STD-883 Class 3B HBM ESD rating (25 kV), complies with IEC 61000-4-5 level 4 surge immunity, and uses a band-marked cathode configuration consistent with DO-15 polarity conventions. Thermal performance is optimized for through-hole mounting with R_th(j-l) = 35 °C/W (junction-to-leads) and R_th(j-a) = 105 °C/W (junction-to-ambient on recommended copper area).

Key Specifications

Pinout & Package

STRVS185X02E is packaged in DO-15 - axial-lead, through-hole plastic case with cathode band marking. Leads are solder-plated and compliant with MIL-STD-750 method 2026 solderability requirements.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar TVS diode protection applications.

Compared with STRVS185X02B and P6KE180A, STRVS185X02E offers superior thermal management in high-duty-cycle applications due to its DO-15 package's lower R_th(j-a), tighter V_BR spread (128–158 V), and validated 125 °C clamping specification - making it optimal for continuous-operation flyback auxiliary supplies.

Availability

STRVS185X02E is available at Aetrix Electronics and suitable for industrial power supplies, motor drive gate protection, and DC bus transient suppression requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for STRVS185X02E 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, specializing in power management, analog, microcontrollers, and discrete protection devices.

The STRVSX series was developed specifically for repetitive overvoltage protection in power conversion topologies - targeting reliability-critical flyback, resonant, and hard-switched SMPS where traditional TVS diodes degrade under frequent surge stress.

FAQ

What is the maximum peak pulse current rating for STRVS185X02E?

The STRVS185X02E is rated for 2 A peak pulse current (I_PP) under 10/1000 µs waveform conditions, with clamping voltage guaranteed at 185 V at 125 °C junction temperature. This rating is validated per IEC 61000-4-5 level 4 test conditions and applies to repetitive surge events up to 1 kHz frequency.

Does STRVS185X02E support bidirectional transient suppression?

No - STRVS185X02E is a unidirectional TVS diode, indicated by its single cathode band marking and specified clamping behavior only in reverse bias. It does not provide symmetrical protection; for bidirectional applications, a separate design using two devices or a dedicated bidirectional part like STRVS185X02D would be required.

How does the DO-15 package affect thermal performance compared to SMB or SMC variants?

The DO-15 package delivers R_th(j-a) = 105 °C/W (vs. 185 °C/W for SMB and 150 °C/W for SMC) on standard PCB layouts, enabling ~40% higher average power dissipation before reaching 175 °C junction limit. This makes STRVS185X02E preferable in high-duty-cycle applications where thermal accumulation is a concern.

Is STRVS185X02E compliant with automotive AEC-Q200 standards?

No - STRVS185X02E is not AEC-Q200 qualified. The datasheet explicitly states ST products are not designed or authorized for automotive, safety-critical, or aerospace applications unless expressly designated. For automotive-grade TVS, ST recommends the SMAJ or SMCJ series with AEC-Q200 certification.