STMicroelectronics STTH112UFY

Overview

STTH112UFY from STMicroelectronics is an AEC-Q101-qualified 1200 V ultrafast recovery rectifier diode in SMB Flat package, rated for 1 A average forward current, 53 ns typical reverse recovery time, and 175 °C maximum junction temperature; used as free-wheeling diode in automotive power supplies and switching-mode transistor base drive circuits.

For engineers reviewing the STTH112UFY datasheet, STTH112UFY pinout, STTH112UFY application, or STTH112UFY equivalent, key selection criteria include V_RRM = 1200 V, I_F(AV) = 1 A, t_rr = 53 ns, T_j(max) = 175 °C, and AEC-Q101 qualification for automotive-grade reliability under thermal stress.

Technical Context

This planar-junction ultrafast rectifier uses ST's 1200 V technology to minimize conduction and switching losses simultaneously. Its low 1.1 V typical forward voltage at 150 °C and negligible reverse recovery charge enable high-efficiency operation in hard-switched topologies.

The device features a thermally optimized SMB Flat package with wettable leads and 20 °C/W junction-to-lead thermal resistance. It supports continuous operation up to 175 °C junction temperature and withstands 18 A non-repetitive surge current (8.3 ms).

Key Specifications

Pinout & Package

SMB Flat package: surface-mount, flat lead profile with wettable flanks for automated optical inspection (AOI); dimensions per JEDEC MO-213AA: D = 3.30–3.95 mm, E = 5.10–5.60 mm, L = 0.75–1.50 mm; UL94 V0 epoxy, lead-free compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MUR1120 and VS-1EWH12, STTH112UFY uniquely combines AEC-Q101 qualification, 53 ns t_rr, wettable SMB Flat packaging, and 20 °C/W R_th(j-l)-making it the only choice for space-constrained, thermally demanding automotive power modules requiring zero-defect SMT yield.

Availability

STTH112UFY is available at Aetrix Electronics and suitable for automotive DC/DC converters, on-board chargers, and electric power steering systems requiring stable component supply with full AEC-Q101 traceability and extended temperature support.

Supply support for STTH112UFY 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 automotive, industrial, and consumer markets.

The STTH ultrafast rectifier product line targets high-reliability automotive and industrial power conversion, emphasizing low-loss switching, high-temperature operation, and AEC-Q101 compliance for next-generation electrified systems.

FAQ

Is STTH112UFY pin-compatible with STTH112-Y?

Yes - STTH112UFY and STTH112-Y share identical SMB Flat package dimensions, pinout (anode/cathode), and electrical specifications. The "UFY" suffix denotes tape-and-reel packaging (5000 pcs) with wettable flank leads, while "Y" is the base order code; both meet ECOPACK3 and AEC-Q101 requirements.

What is the maximum recommended PCB copper area for thermal performance?

Per Figure 6 in DS10171, R_th(j-a) improves from ~4.5 °C/W (no copper) to ~1.5 °C/W with 3 cm² of 70 µm-thick FR4 copper per lead. For 1 A continuous operation at 175 °C T_j, ≥2 cm² total copper (1 cm² per lead) is recommended to maintain T_L ≤135 °C without forced air.

Does STTH112UFY require a snubber circuit in 400 V bus applications?

No snubber is required for typical 400 V bus freewheeling use due to its ultrafast 53 ns t_rr and low stored charge. However, a small RC snubber (e.g., 100 Ω + 100 pF) is advised when switching inductive loads with dI/dt >50 A/µs or when layout parasitics exceed 20 nH to suppress voltage overshoot beyond V_RRM.

How does STTH112UFY perform under cold-crank conditions (–40 °C)?

At –40 °C, V_F increases to ~1.9 V (per Table 3), but t_rr decreases to ~40 ns, improving switching efficiency. Reverse leakage remains <0.1 µA. The device is fully characterized from –40 °C to +175 °C and qualified per AEC-Q101 low-temperature operating life (LTOL) and thermal shock tests.