STMicroelectronics STTH2003CFP

Overview

STTH2003CFP from STMicroelectronics is a dual-center-tap ultrafast recovery epitaxial rectifier diode in an insulated TO-220FPAB package, rated for 300 V repetitive reverse voltage and 2 × 10 A average forward current per diode at TC = 115 °C, with 25 ns max reverse recovery time and 0.85 V typical forward voltage at 125 °C - used for secondary rectification in telecom power supplies and high-frequency DC/DC converters.

For engineers reviewing the STTH2003CFP datasheet, STTH2003CFP pinout, STTH2003CFP application, or STTH2003CFP equivalent, key selection criteria include thermal resistance (Rth(j-c) = 4.6 °C/W per diode), soft recovery (S factor ≥ 0.3), insulation rating (2000 VRMS), and dual-diode center-tap configuration for synchronous rectifier topologies.

Technical Context

The STTH2003CFP integrates two independent fast-recovery epitaxial diodes in a single insulated TO-220FPAB housing, sharing a common cathode terminal and featuring soft, noise-free reverse recovery to minimize EMI in high-switching-frequency SMPS. Its junction temperature can reach 175 °C, supported by low conduction losses (VF typ. 0.85 V @ 10 A, 125 °C) and controlled dynamic behavior (trr ≤ 25 ns, IRM ≤ 8 A).

Thermal management relies on case-to-heatsink conduction via the insulated tab (2000 VRMS isolation), with Rth(j-c) = 4.6 °C/W per diode and Rth(c) = 3.5 °C/W coupling between diodes - enabling accurate junction temperature estimation when both diodes operate simultaneously using ΔTj(diode1) = P(diode1) × Rth(j-c) + P(diode2) × Rth(c).

Key Specifications

Pinout & Package

STTH2003CFP uses the TO-220FPAB package: insulated plastic housing with metal tab isolated at 2000 VRMS, 3-pin configuration (K–K–A), and screw-mount mechanical interface. The tab serves as the common cathode (K) for both diodes; the two outer pins are anodes (A1, A2).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultrafast dual-center-tap rectifier applications.

Compared with STTH2003CT and STTH2003CR, the STTH2003CFP uniquely provides certified 2000 VRMS isolation in a screw-mount package - making it the only choice for safety-critical, floating secondary rectification where creepage and thermal management must coexist without added components.

Availability

STTH2003CFP is available at Aetrix Electronics and suitable for telecom power supplies, isolated DC/DC converters, and industrial motor drive auxiliary PSUs requiring stable component supply across multi-year production cycles.

Supply support for STTH2003CFP 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 microcontrollers, power devices, sensors, and analog ICs for industrial, automotive, and communications markets.

The STTH2003 series belongs to ST's high-voltage ultrafast rectifier product line, engineered specifically for high-efficiency, high-frequency secondary-side rectification in telecom and industrial SMPS where soft recovery and thermal robustness are critical.

FAQ

What is the maximum allowable case temperature for continuous operation of STTH2003CFP?

The STTH2003CFP is rated for IF(AV) = 10 A per diode at TC = 115 °C. Exceeding this case temperature requires derating per Figure 12 in DS1213; at TC = 100 °C, average current drops to ~11.5 A per diode, and at TC = 80 °C, it rises to ~13 A. Thermal design must maintain tab temperature ≤115 °C under worst-case load and ambient conditions.

Can STTH2003CFP be used in parallel with another unit for higher current capacity?

No - STTH2003CFP is not characterized or recommended for paralleling. Its VF vs. temperature curve (Figure 2) shows positive TC, but mismatched thermal paths and dynamic recovery variations between units risk current imbalance. For >20 A total, use a single higher-rated device or redesign with interleaved phases instead of paralleling.

Does the 2000 VRMS insulation rating apply to DC voltage stress?

Yes - the 2000 VRMS insulation rating corresponds to ~2800 VDC peak withstand capability per IEC 60950-1 Annex G. It is validated under sine-wave AC test conditions but provides equivalent dielectric strength for steady-state DC isolation in secondary-side applications, including 300 V DC bus referenced systems.

How does the softness factor (S ≥ 0.3) impact EMI filter design?

A softness factor ≥ 0.3 indicates gradual current decay during reverse recovery, reducing di/dt-induced voltage spikes and high-frequency harmonics above 30 MHz. This allows reduction of Y-capacitor values by up to 40% and eliminates need for RC snubbers in Class B conducted EMI compliance testing per CISPR 32.