STMicroelectronics STTH152RL

Overview

STTH152RL from STMicroelectronics is a 200 V, 1.5 A ultrafast recovery rectifier diode in DO-15 package, optimized for switching-mode base drive circuits and freewheeling applications in power supplies. It features 32 ns reverse recovery time, 0.75 V max forward voltage at 125°C, and 175°C maximum junction temperature.

For engineers reviewing the STTH152RL datasheet, STTH152RL pinout, STTH152RL application, or STTH152RL equivalent, key selection criteria include ultrafast trr performance, low conduction loss at elevated temperature, thermal resistance under real PCB mounting conditions, and DO-15 mechanical compatibility with legacy through-hole layouts.

Technical Context

This planar-junction ultrafast diode uses ST's 200 V process to minimize stored charge and achieve negligible switching losses. Its 32 ns trr (measured at IF = 1 A, dIF/dt = −50 A/µs, VR = 30 V, Tj = 25°C) enables high-frequency operation in SMPS and motor drive snubbers.

The device delivers stable conduction performance across temperature: VF drops to 0.66 V (typ.) at 125°C under 1.5 A DC, while IR remains ≤40 µA at same condition. Thermal resistance junction-to-ambient is 45 °C/W on infinite heatsink with 10 mm leads - a critical parameter for derating in compact power designs.

Key Specifications

Pinout & Package

DO-15 axial-leaded package with cathode indicated by white band. Body length 6.05–6.75 mm, lead diameter 0.71–0.88 mm, overall length 26–31 mm. Designed for wave soldering and manual insertion into 0.8–1.0 mm PCB holes.

Key Features

Applications

Availability

STTH152RL is available at Aetrix Electronics and suitable for switch-mode power supplies, transistor base drive circuits, motor drive snubbers, and DC link protection requiring stable component supply and long-term obsolescence management.

Supply support for STTH152RL 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, designing and manufacturing analog, power, MCU, and sensor solutions for industrial, automotive, and consumer markets.

The STTH ultrafast diode product line targets high-efficiency power conversion systems where low trr, robust surge capability, and thermal stability are mandatory - especially in space-constrained, high-reliability power supplies.

FAQ

What is the cathode marking convention for STTH152RL?

The cathode is marked by a single white band located near one end of the DO-15 body. This band aligns with the cathode terminal - the lead on the same side as the band. Polarity must be verified before PCB layout, as incorrect orientation causes immediate failure in freewheeling paths.

Can STTH152RL replace UF4007 in existing designs?

Yes, but with design review: STTH152RL offers lower trr (32 ns vs. 75 ns) and higher Tj (175°C vs. 150°C), improving efficiency and thermal margin. However, its IF(AV) is 1.5 A vs. UF4007's 1.0 A, so layout cooling must accommodate higher average current if operated near limit.

Is STTH152RL suitable for surface-mount reflow assembly?

No - STTH152RL is strictly a through-hole DO-15 device with axial leads. It is not rated for SMT reflow profiles. Attempting reflow will crack the epoxy body and void UL 94 V-0 compliance. Use STTH1R06 or similar SOD-123 variants for SMT-compatible ultrafast diodes.

How does Rth(j-a) change with PCB copper area?

Rth(j-a) = 45 °C/W assumes infinite heatsink with 10 mm leads - a theoretical baseline. Real-world values increase sharply with reduced copper: e.g., 1 cm² of 1 oz copper raises Rth(j-a) to ~75 °C/W. Derating curves in Figure 2 show IF(AV) drops to 0.9 A at Tamb = 70°C with minimal copper.