STMicroelectronics STTH1R04Q

Overview

STTH1R04Q from STMicroelectronics is a 1 A, 400 V ultrafast recovery diode in DO-15 package, engineered for low-loss switching in base-drive and transistor circuits. It delivers typ. 0.9 V forward voltage at 150 °C, 14 ns reverse recovery time at 100 A/µs, and operates up to 175 °C junction temperature - ideal for telecom power supplies and high-frequency inverters.

For engineers reviewing the STTH1R04Q datasheet, STTH1R04Q pinout, STTH1R04Q application, or STTH1R04Q equivalent, key selection criteria include ultrafast trr performance under high dIF/dt, thermal robustness in leaded through-hole mounting, and conduction loss modeling using P = 0.9 × IF(AV) + 0.250 × IF²(RMS).

Technical Context

This diode employs ST's planar platinum-doped silicon technology to achieve controlled minority-carrier lifetime, enabling ultrafast recovery with minimal tail current. Its dynamic behavior is characterized by trr = 14 ns (typ.) at dIF/dt = −100 A/µs and VR = 30 V, with IRM ≤ 3.5 A at Tj = 125 °C under harsh dIF/dt = −200 A/µs conditions.

Thermal design is supported by Rth(j-l) = 50 °C/W (DO-15, lead length = 10 mm on infinite heatsink), and static ratings include VRRM = 400 V, IF(AV) = 1 A at TL = 105 °C, and IFSM = 30 A (10 ms sinusoidal). Reverse leakage remains ≤50 µA at 125 °C.

Key Specifications

Pinout & Package

STTH1R04Q is housed in a DO-15 axial-leaded package with two terminals: anode and cathode. The package complies with JEDEC DO-15 standards, features epoxy body meeting UL94 V0, and supports through-hole soldering with 26–31 mm lead length.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH1R04Q, STTH1L04 offers identical electrical performance in a smaller surface-mount package but reduced thermal mass and different mounting mechanics, while BYV26E trades speed and forward loss for higher average current rating - making STTH1R04Q optimal for high-frequency, thermally dense telecom and inverter designs.

Availability

STTH1R04Q is available at Aetrix Electronics and suitable for telecom power rectification, high-frequency inverter freewheeling, and transistor base drive protection requiring stable component supply and long-term obsolescence management.

Supply support for STTH1R04Q 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 power devices for industrial, automotive, and communications markets.

The STTH1R04 series belongs to ST's ultrafast recovery diode product line, developed specifically for high-efficiency, high-frequency power conversion in telecom infrastructure, renewable energy inverters, and industrial motor drives.

FAQ

What is the maximum allowable junction temperature for STTH1R04Q?

The absolute maximum junction temperature (Tj(max.)) is +175 °C, as specified in Table 1 of the DS5848 datasheet. This rating applies under steady-state and transient conditions, provided thermal design ensures actual junction temperature does not exceed this limit during operation.

Does STTH1R04Q have a built-in snubber or capacitive element?

No. STTH1R04Q is a discrete ultrafast recovery diode with no integrated snubber, capacitor, or resistor. Its junction capacitance is 100 pF typical at VR = 4 V (Figure 7), which is inherent to the PN structure - external RC snubbers must be added if required by circuit topology.

Can STTH1R04Q replace a standard FR107 diode in a 100 kHz flyback converter?

Yes - STTH1R04Q offers significantly faster recovery (14 ns vs. ~500 ns for FR107) and lower VF (0.9 V vs. ~1.3 V), reducing switching and conduction losses. However, verify layout parasitics and gate drive timing, as faster diodes can increase ringing if snubbing is inadequate.

Is the DO-15 package of STTH1R04Q compatible with wave soldering?

Yes. The DO-15 package is rated for wave soldering per JEDEC J-STD-020. Peak temperature must not exceed 260 °C for ≤10 seconds, and preheat ramp rate should stay within 3 °C/s. Lead finish is matte tin, fully compatible with Pb-free and SnPb solder processes.