Diodes Incorporated DLLFSD01T-7

Overview

DLLFSD01T-7 from Diodes Incorporated is an ultra-low-leakage, fast-switching surface-mount Schottky diode in SOD523 package, rated for 80 V reverse voltage, 300 mA forward current, and featuring 5 nA typical reverse leakage at 5 V, <1 pF capacitance at 0 V, and 4.0 ns reverse recovery time. It serves as a high-efficiency signal clamping or polarity protection diode in space-constrained RF front-end and precision analog sensing circuits.

For engineers reviewing the DLLFSD01T-7 datasheet, DLLFSD01T-7 pinout, DLLFSD01T-7 application, or DLLFSD01T-7 equivalent, key selection criteria include ultra-low IR (5 nA @ VR = 5 V), sub-1 pF junction capacitance, fast trr (4.0 ns), thermal performance under derating (RθJA = 833 °C/W), and AEC-Q200-readiness for automotive-grade reliability validation.

Technical Context

This diode employs a planar epitaxial silicon structure optimized for minimal minority-carrier storage, enabling nanosecond-scale reverse recovery. Its low-leakage design targets bias networks and sample-hold circuits where dark-current integrity is critical.

The SOD523 package's 0.0014 g mass and 1.25 mm × 0.85 mm footprint support high-density PCB layouts in portable instrumentation and wireless transceivers, while its matte tin–annealed Alloy 42 leadframe ensures robust solderability per MIL-STD-202 Method 208.

Key Specifications

Pinout & Package

Package: SOD523 - ultra-compact 1.25 mm × 0.85 mm surface-mount plastic package with cathode band marking; moisture sensitivity level 1 per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-leakage fast-switching diode applications.

Compared with BAT54C-7-F and NSR0230HT1G, DLLFSD01T-7 uniquely balances 80 V blocking, 5 nA leakage, and SOD523 size-making it the sole option for 5–80 V precision RF/analog signal paths where both leakage and capacitance must be minimized simultaneously.

Availability

DLLFSD01T-7 is available at Aetrix Electronics and suitable for RF detector modules, medical sensor front-ends, USB-C port protection, and high-speed logic interface designs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for DLLFSD01T-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, manufacturing, and sales operations across Asia, Europe, and North America.

This device belongs to Diodes' advanced signal diode product line, engineered specifically for high-frequency, low-leakage applications in portable, automotive, and industrial sensing systems where traditional Schottky trade-offs between VF and IR are unacceptable.

FAQ

What is the maximum junction temperature and how does it affect power handling?

The DLLFSD01T-7 has a maximum junction temperature of +150°C and a thermal resistance of 833°C/W. At 25°C ambient, it can dissipate its full 150 mW rating, but power must be linearly derated above that point-e.g., only 75 mW at 75°C ambient. This behavior is defined by the curve in Figure 1 of the datasheet and assumes mounting on FR-4 with Diodes' recommended pad layout.

Is this diode suitable for automotive applications?

Yes-the DLLFSD01T-7 is manufactured in IATF 16949-certified facilities and supports PPAP documentation. While not pre-qualified to AEC-Q101, Diodes states it meets requirements for automotive applications needing specific change control, and its −55°C to +150°C operating range and robust SOD523 construction align with under-hood and cabin module needs.

How does the 5 nA leakage compare to standard Schottky diodes?

Standard Schottky diodes like BAT54 series typically exhibit 100–500 nA leakage at 5 V, making DLLFSD01T-7 ~20–100× lower. This is achieved via optimized epitaxial layer doping and surface passivation, directly enabling stable operation in high-impedance analog circuits where even 10 nA would cause measurable offset or drift.

Can this diode replace a small-signal silicon diode like 1N4148 in high-frequency circuits?

Yes-its 4.0 ns trr and <1 pF CT outperform 1N4148 (trr ≈ 4 ns but CT ≈ 4 pF), and its 0.62 V VF @ 1 mA is lower than 1N4148's ~0.85 V. However, its 80 V VRRM is lower than 1N4148's 100 V, so replacement is valid only where reverse voltage stays below 80 V and ultra-low capacitance is prioritized.