Diodes Incorporated SD103B-F

Overview

SD103B-F from Diodes Incorporated is a glass-passivated Schottky barrier diode in DO-35 package, rated for 30 V peak repetitive reverse voltage, 350 mA forward continuous current, and 10 ns reverse recovery time. It features low forward voltage drop (max 0.60 V at 200 mA), guard ring construction for transient protection, and RoHS-compliant Sn96.5Ag3.5 terminations. It is used in low-voltage DC power rectification and polarity protection circuits in compact consumer and industrial power supplies.

For engineers reviewing the SD103B-F datasheet, SD103B-F pinout, SD103B-F application, or SD103B-F equivalent, key selection criteria include its 30 V VRRM rating, 0.60 V VFM at 200 mA, 10 ns trr, DO-35 mechanical compatibility, and cathode-band polarity marking-critical for space-constrained, high-efficiency 5–24 V input rectifier designs.

Technical Context

This Schottky diode operates via majority-carrier conduction, eliminating minority-carrier storage delay and enabling fast switching with trr ≤ 10 ns under IF = IR = 50–200 mA conditions. Its guard ring structure enhances ruggedness against voltage transients without requiring external TVS components.

The DO-35 glass package provides hermetic sealing and thermal resistance RθJA = 300 °C/W, supporting operation up to Tj = 125 °C. Reverse leakage is limited to 5.0 μA at VR = 20 V, and junction capacitance is 50 pF at 0 V bias and 1 MHz-suitable for low-noise, medium-frequency rectification.

Key Specifications

Pinout & Package

DO-35 axial glass package with cathode band marking; leads are Sn96.5Ag3.5 solderable per MIL-STD-202, Method 208. Polarity identified by single black band at cathode end.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SB130-E3/54 and 1N5817, SD103B-F delivers optimal balance of low VFM, fast trr, and compact DO-35 size-making it preferred for space-limited, thermally sensitive 24 V-input rectifiers requiring <10 ns recovery and <0.60 V conduction loss.

Availability

SD103B-F is available at Aetrix Electronics and suitable for USB power protection, low-voltage DC-DC output rectification, and industrial sensor signal conditioning requiring stable component supply and long-term manufacturability.

Supply support for SD103B-F 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, specializing in high-reliability, cost-optimized components for power management, signal integrity, and protection.

The SD103x series targets compact, high-efficiency rectification in consumer, industrial, and IoT power interfaces-designed specifically for low-voltage, low-leakage, fast-recovery requirements in space-constrained layouts.

FAQ

Is SD103B-F suitable for automotive applications?

No-SD103B-F is not AEC-Q200 qualified and lacks extended temperature validation beyond Tj = 125 °C. Its DO-35 glass package and 125 °C max junction temperature do not meet automotive under-hood thermal or reliability requirements. For automotive use, consider AEC-Q200-certified Schottky diodes such as Diodes Inc.'s AP1502 series.

What is the maximum allowable soldering temperature for SD103B-F?

SD103B-F supports standard lead-free reflow per J-STD-020C Level 1, with peak temperature up to 260 °C for ≤ 30 seconds. The Sn96.5Ag3.5 termination and glass body tolerate this profile without delamination or parameter shift, provided preheat and cooling rates comply with MIL-STD-202, Method 208.

Does SD103B-F have a specified avalanche rating?

No-SD103B-F has no rated avalanche energy (EAS) or unclamped inductive switching capability. Its guard ring improves transient robustness, but it is not designed for repetitive avalanche operation. For inductive load switching, add external clamping or select a diode explicitly rated for UIS, such as the SB560.

Can SD103B-F replace SD103A or SD103C in existing designs?

Yes-with design review: SD103B-F (30 V VRRM) sits between SD103A (40 V) and SD103C (20 V). Substitution is acceptable if system reverse voltage stays ≤30 V and leakage at 20 V (5.0 μA) meets requirements. Confirm thermal margin, as all share identical Pd = 400 mW and RθJA = 300 °C/W.