STMicroelectronics STTH1R02Q

Overview

STTH1R02Q from STMicroelectronics is a 200 V, 1.5 A ultrafast recovery diode in DO-15 package, engineered for low-loss switching in high-frequency inverters, flyback circuits, and polarity protection. It features 15 ns typical reverse recovery time, 0.70–0.80 V forward voltage at 150 °C, and 175 °C maximum junction temperature.

For engineers reviewing the STTH1R02Q datasheet, STTH1R02Q pinout, STTH1R02Q application, or STTH1R02Q equivalent, key selection criteria include ultrafast trr performance under high dIF/dt, thermal robustness in leaded through-hole mounting, and conduction loss optimization in auxiliary power supplies and LED drivers.

Technical Context

This diode employs ST's planar platinum-doped silicon technology to achieve tightly controlled minority carrier lifetime, enabling consistent ultrafast recovery (trr ≤ 30 ns) with low IRM and minimal QRR dispersion across temperature. Its dynamic behavior is characterized under defined dIF/dt conditions (up to –200 A/µs) and reverse voltage (up to 160 V).

The device operates with a maximum junction temperature of 175 °C and exhibits stable VF over temperature (0.70 V typ. at 150 °C, IF = 1.5 A), supported by Rth(j-l) = 45 °C/W (DO-15, 10 mm leads), making it suitable for thermally constrained through-hole designs without heatsinking.

Key Specifications

Pinout & Package

STTH1R02Q is housed in a DO-15 axial-leaded package with cathode band marking. The device has two terminals: anode and cathode, with polarity indicated by a painted band on the cathode end.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultrafast recovery diode applications.

Compared with STTH1R02Q, STTH1L06 trades faster recovery for higher voltage headroom, while ES1D-E3/54 sacrifices current and thermal capability for surface-mount compatibility-making STTH1R02Q optimal for thermally demanding, medium-current through-hole ultrafast rectification.

Availability

STTH1R02Q is available at Aetrix Electronics and suitable for LED lighting drivers, auxiliary power supplies, reverse polarity protection circuits, and DC motor flyback clamping requiring stable component supply and long-term manufacturability.

Supply support for STTH1R02Q 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, discrete devices, and MEMS for industrial, automotive, and consumer markets.

The STTH ultrafast diode product line targets high-efficiency, high-frequency power conversion systems-including SMPS, lighting, and motor control-where low QRR, tight trr distribution, and thermal resilience are critical.

FAQ

What is the cathode marking convention for STTH1R02Q?

The cathode is marked by a distinct painted band near one end of the DO-15 cylindrical body. When viewed with the band on the left, the right-hand lead is the anode. This marking aligns with JEDEC DO-15 standards and is verified in ST's DS4743 Rev 4 package drawings (Figure 22).

Can STTH1R02Q replace a standard FR107 in a 24 V flyback design?

Yes-STTH1R02Q offers superior performance: FR107 has trr ≈ 500 ns and VF ≈ 1.1 V, while STTH1R02Q delivers trr = 15 ns and VF ≈ 0.7 V at 150 °C. This reduces switching loss by >90% and conduction loss by ~35%, enabling higher frequency operation and cooler thermal performance.

What is the maximum recommended lead length for STTH1R02Q in free-air operation?

Per DS4743 Figure 16, Rth(j-a) remains ≤ 50 °C/W up to 100 mm lead length. However, for reliable thermal design in production, ST recommends ≤ 10 mm lead length to maintain Rth(j-l) = 45 °C/W and avoid excessive thermal resistance from lead conduction losses.

Does STTH1R02Q require derating at elevated ambient temperatures?

Yes-IF(AV) must be derated linearly above 135 °C case temperature per Table 1. At 150 °C TL, rated current drops to ~1.2 A; at 175 °C TL, it falls to zero. Derating curves are provided in Figure 1 of DS4743, and thermal design must account for Rth(j-l) = 45 °C/W and PCB copper area.