STMicroelectronics STTH1R06A

Overview

STTH1R06A from STMicroelectronics is an ultrafast high-voltage silicon rectifier diode in SMA package, rated for 600 V repetitive peak reverse voltage, 1 A average forward current, and 25 ns maximum reverse recovery time. It serves as a boost diode in active PFC stages and as a freewheeling diode in offline SMPS and industrial DC-DC converters.

For engineers reviewing the STTH1R06A datasheet, STTH1R06A pinout, STTH1R06A application, or STTH1R06A equivalent, this device is selected for high-efficiency 600 V switching applications where low conduction loss (VF = 1.0 V typ. @ 150 °C), low trr, and thermal robustness (Rth(j-l) = 30 °C/W) are critical in compact power supplies.

Technical Context

The STTH1R06A uses ST's Turbo 2 process to achieve soft reverse recovery with low IRM and controlled Qrr, minimizing EMI and voltage overshoot during turn-off in hard-switched topologies. Its junction-to-lead thermal resistance of 30 °C/W enables reliable operation at Tj = 175 °C under continuous 1 A conduction.

Designed for unidirectional current flow in high-frequency power conversion, it exhibits VF = 1.0–1.25 V across 25–150 °C at IF = 1 A and maintains trr ≤ 45 ns under dIF/dt = –50 A/µs, supporting >100 kHz switching in PFC and flyback designs.

Key Specifications

Pinout & Package

SMA package (DO-214AC), surface-mount, cathode marked by band on body. Lead-free, RoHS-compliant, UL94 V0 epoxy.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultrafast 600 V rectifier applications.

Compared with STTH1R06A, STTH1L06 trades current capability and speed for axial through-hole compatibility, while ES1J offers lower cost at the expense of 70% higher conduction loss and slower recovery-making STTH1R06A optimal for thermally demanding, high-frequency PFC and SMPS rectification.

Availability

STTH1R06A is available at Aetrix Electronics and suitable for active PFC boost stages, offline flyback secondary rectification, and industrial DC-DC freewheeling applications requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.

Supply support for STTH1R06A 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, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

The STTH series belongs to ST's high-voltage ultrafast rectifier product line, engineered specifically for energy-efficient AC-DC and DC-DC power conversion where low trr, soft recovery, and high-temperature reliability are essential.

FAQ

What is the maximum junction temperature and how does it affect layout?

The STTH1R06A has a maximum junction temperature of 175 °C. This allows operation in high-ambient environments (e.g., enclosed industrial drives) without derating, provided the PCB copper area provides ≤30 °C/W thermal resistance from junction to ambient. A minimum 1 cm² 2-oz copper pad per lead is recommended for sustained 1 A operation.

Is STTH1R06A suitable for synchronous rectification replacement?

No-STTH1R06A is a unidirectional silicon PN junction diode and cannot replace synchronous rectifiers (MOSFETs). It lacks gate control, bidirectional conduction, or low RDS(on) characteristics. Its role is strictly passive rectification in topologies where MOSFET-based synchronous rectification is not implemented due to cost, complexity, or frequency constraints.

How does reverse recovery softness impact EMI in PFC circuits?

The STTH1R06A exhibits soft reverse recovery (S factor >3.5 at dIF/dt = 200 A/µs), meaning its reverse current decays gradually rather than abruptly. This reduces high-frequency spectral content in switching node waveforms, lowering conducted EMI and easing compliance with EN 55022 Class B limits without additional filtering.

Can STTH1R06A be used in place of STTH1R06U (SMB package)?

Yes-both share identical electrical specifications (VRRM, IF(AV), trr, VF), but STTH1R06A (SMA) has higher Rth(j-l) = 30 °C/W vs. STTH1R06U's 25 °C/W. In thermally constrained designs, SMB may allow ~15% higher power dissipation before reaching Tj = 175 °C; otherwise, they are functionally interchangeable with matching footprint adaptations.