STMicroelectronics STTH30R04DY

Overview

STTH30R04DY from STMicroelectronics is an automotive-grade ultrafast recovery diode in TO-220AC package, rated for 400 V repetitive peak reverse voltage, 30 A average forward current, and 24 ns typical reverse recovery time at 25 °C. It features low thermal resistance (0.8 °C/W), AEC-Q101 qualification, and operates up to 175 °C junction temperature - deployed in high-efficiency DC/DC converters and motor drive freewheeling paths.

For engineers reviewing the STTH30R04DY datasheet, STTH30R04DY pinout, STTH30R04DY application, or STTH30R04DY equivalent, key selection criteria include reverse recovery time under high dIF/dt, forward voltage drop at 150 °C, thermal impedance junction-to-case, and AEC-Q101 compliance for automotive power systems.

Technical Context

This diode employs a planar epitaxial silicon structure optimized for ultrafast switching with controlled minority carrier lifetime. Its dynamic performance is characterized by trr = 24 ns (typ) at IF = 1 A, dIF/dt = −200 A/µs, VR = 30 V, and IRM = 10–14 A under harsh conditions (IF = 30 A, Tj = 125 °C).

Static behavior includes VF = 1.0 V (typ) at IF = 15 A, Tj = 25 °C, and IR ≤ 15 µA at VR = 400 V, Tj = 25 °C. Thermal design is enabled by Rth(j-c) = 0.8 °C/W, supporting conduction loss calculation via P = 0.95 × IF(AV) + 0.01 × IF²(RMS).

Key Specifications

Pinout & Package

STTH30R04DY uses a 2-terminal TO-220AC package with isolated tab (anode connected to lead, cathode to tab). Mounting requires 0.4–0.6 N·m torque on M3 screw; tab serves as cathode terminal and primary thermal interface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MUR3040PT and VS-30EWH04-M3, STTH30R04DY offers the lowest trr among TO-220AC-packaged 400 V diodes and best thermal trade-off for space-constrained automotive modules requiring AEC-Q101 validation.

Availability

STTH30R04DY is available at Aetrix Electronics and suitable for automotive DC/DC converters, industrial motor drives, and solar microinverters requiring stable component supply with full AEC-Q101 traceability and long-term production commitment.

Supply support for STTH30R04DY 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, MCU, power, and sensor solutions for automotive, industrial, and consumer markets.

STTH30R04DY belongs to ST's STTH ultrafast diode product line, engineered specifically for high-reliability automotive power conversion where low trr, high Tj, and AEC-Q101 compliance are mandatory.

FAQ

Is STTH30R04DY pin-compatible with STTH30R04WY?

No. STTH30R04DY uses TO-220AC (2-lead, isolated tab cathode), while STTH30R04WY uses DO-247 (3-lead, cathode on lead 3). Mechanical mounting, thermal path, and PCB layout differ fundamentally - no direct PCB swap is possible without redesign.

What is the maximum allowable dIF/dt for reliable operation?

Per Figure 4 and Table 5, IRM remains ≤14 A up to dIF/dt = −200 A/µs at Tj = 125 °C. Operation beyond −200 A/µs risks excessive peak reverse recovery current, potentially causing secondary breakdown; design margin recommends limiting to −150 A/µs for robustness.

Does STTH30R04DY require snubber circuitry in 100 kHz SMPS designs?

Not typically. With trr = 24 ns and soft recovery characteristics (QRR = 350 nC typ at dIF/dt = −200 A/µs), it suppresses voltage overshoot below 10% of VRRM in properly laid-out layouts. Snubbers are only needed if parasitic inductance exceeds 25 nH in the diode loop.

Can STTH30R04DY replace a standard FR307 in an existing 400 V, 3 A power supply?

No - STTH30R04DY is rated for 30 A average current and requires active heatsinking. Its 0.8 °C/W Rth(j-c) and TO-220AC footprint are incompatible with FR307's DO-41 package and 3 A rating. Substitution would cause catastrophic thermal runaway without full thermal redesign.