Diodes Incorporated SK34-7

Overview

SK34-7 from Diodes Incorporated is a surface-mount Schottky barrier rectifier with 40 V maximum recurrent peak reverse voltage, 3.0 A average forward rectified current, and 0.50 V typical forward voltage at 3.0 A. It features guard ring construction for transient protection and is used in DC-DC converter output rectification, AC-DC secondary-side rectification, and low-voltage power supplies.

For engineers reviewing the SK34-7 datasheet, SK34-7 pinout, SK34-7 application, or SK34-7 equivalent, key selection factors include its low VF for efficiency-critical 5–12 V output rails, SMC package thermal performance on 8.0 mm² pads, and 100 A surge rating for inrush tolerance in industrial power modules.

Technical Context

This Schottky rectifier operates with zero minority-carrier storage, enabling fast switching and minimal reverse recovery loss-critical for high-frequency (≥100 kHz) switching power supplies. Its guard ring structure enhances ruggedness against voltage transients, while the SMC package supports 3.0 A continuous conduction with junction-to-lead thermal resistance of 10 °C/W under standard mounting conditions.

The device exhibits 300 pF typical junction capacitance at 4.0 V reverse bias and 1.0 MHz, limiting high-frequency displacement current in snubberless designs. Reverse leakage remains ≤0.5 mA at 25 °C and rated 40 V blocking, rising to 20 mA at 100 °C-enabling stable operation across automotive under-hood temperature ranges.

Key Specifications

Pinout & Package

Package: SMC (DO-214AB), molded plastic case with cathode band marking; dimensions: A = 5.59–6.22 mm, B = 6.60–7.11 mm, C = 2.75–3.18 mm, E = 7.75–8.13 mm; weight ≈ 0.21 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with B340A-13-F and SS34H, SK34-7 offers optimal balance of thermal performance (10 °C/W RθJL), industry-standard SMC footprint, and proven reliability in high-volume industrial power supplies-making it preferred for new designs where thermal headroom and manufacturability are prioritized over marginal VF reduction.

Availability

SK34-7 is available at Aetrix Electronics and suitable for DC-DC converter output rectification, AC-DC adapter secondary-side rectification, and industrial sensor power supply applications requiring stable component supply and long-term production continuity.

Supply support for SK34-7 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and the U.S.

The SKxx series targets cost-sensitive, high-volume power conversion applications, emphasizing robustness, thermal efficiency, and compliance with industrial and consumer safety standards including UL 94V-0.

FAQ

Is SK34-7 suitable for automotive applications?

SK34-7 meets AEC-Q101 stress test requirements for temperature cycling, humidity, and surge when operated within its rated junction temperature range (–65 °C to +150 °C) and derated per Fig. 1. Its 20 mA IR at 100 °C and guard ring construction support use in body control modules and infotainment power supplies, though qualification documentation must be obtained directly from Diodes Incorporated for safety-critical functions.

What is the recommended PCB land pattern for SK34-7?

The datasheet specifies an 8.0 mm² (0.13 mm thick) copper pad for each terminal to achieve the rated 10 °C/W junction-to-lead thermal resistance. Recommended dimensions are 2.5 mm × 3.2 mm per pad with 0.5 mm solder mask opening; thermal vias under pads are not required but improve heat spreading in high-ambient environments.

Does SK34-7 have lead-free termination?

Yes-SK34-7 uses matte tin plating compliant with RoHS Directive 2011/65/EU and JEDEC J-STD-020A Level 1 moisture sensitivity. No pre-bake is required prior to reflow, and the part supports standard Pb-free SAC305 solder profiles with peak temperatures up to 260 °C.

Why is SK34-7 marked "NOT RECOMMENDED FOR NEW DESIGN"?

This notice reflects Diodes Incorporated's internal roadmap shift toward the B3X0 series, which offers improved VF (0.42 V), lower IR (0.1 mA), and enhanced surge robustness. SK34-7 remains fully qualified and supported for legacy production and cost-sensitive applications where its performance envelope matches system requirements.