Diodes Incorporated LL4154-7

Overview

LL4154-7 from Diodes Incorporated is a surface-mount fast-switching silicon switching diode in MiniMELF glass package, rated for 25 V peak repetitive reverse voltage, 150 mA average rectified output current, and 4.0 ns reverse recovery time - optimized for high-speed logic interface and signal routing applications including TTL/CMOS level translation and pulse shaping.

For engineers reviewing the LL4154-7 datasheet, LL4154-7 pinout, LL4154-7 application, or LL4154-7 equivalent, key selection criteria include reverse recovery time under 5 ns, low junction capacitance (4.0 pF at 0 V), forward voltage ≤1.0 V at 30 mA, thermal resistance of 300 K/W, and compatibility with automated SMT assembly on high-density PCBs.

Technical Context

The LL4154-7 is a planar-diffused silicon PN junction diode engineered for minimal charge storage and rapid carrier recombination. Its 4.0 ns reverse recovery time (measured at IF = IR = 10 mA, Irr = 0.1 × IR, RL = 100 Ω) enables reliable operation in >100 MHz digital signal paths.

With a junction capacitance of 4.0 pF at 0 V reverse bias and 1.0 V forward drop at 30 mA, it maintains low dynamic loading and predictable threshold behavior across logic families. The device operates from −65 °C to +175 °C and dissipates up to 500 mW at 25 °C ambient, derating linearly above 25 °C per the published curve.

Key Specifications

Pinout & Package

Package: MiniMELF (glass body, axial leads), dimensions A = 3.30–3.70 mm, B = 1.30–1.60 mm, C = 0.28–0.50 mm; cathode marked by single band; solderable per MIL-STD-202, Method 208.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BAT54C-7-F and 1N4148WS-7-F, the LL4154-7 uniquely balances 150 mA current capability, 4.0 ns switching, and MiniMELF reliability - making it optimal for high-density, thermally constrained logic interface designs requiring both speed and drive margin.

Availability

LL4154-7 is available at Aetrix Electronics and suitable for logic level translation, digital signal clamping, pulse shaping networks, and TTL-to-CMOS interface circuits requiring stable component supply across production lifecycles.

Supply support for LL4154-7 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, specializing in high-performance, high-reliability components for industrial, computing, and communications markets.

The LL4154-7 belongs to Diodes' fast-switching diode product line, designed specifically for high-speed digital interface applications demanding sub-5 ns recovery, low capacitance, and robust thermal performance in compact surface-mount packages.

FAQ

What is the maximum operating temperature for LL4154-7?

The LL4154-7 has a specified junction and storage temperature range of −65 °C to +175 °C. Its thermal resistance is 300 K/W, so maximum ambient temperature depends on power dissipation: at 500 mW, ambient must remain ≤25 °C; derating follows the published curve in DS30071 Rev. A-2, Figure 1.

Is LL4154-7 suitable for 3.3 V logic interface protection?

Yes. With 25 V VRRM and 1.0 V VF at 30 mA, the LL4154-7 reliably clamps 3.3 V logic signals to safe levels while adding negligible propagation delay (<4 ns). Its 4.0 pF junction capacitance avoids signal integrity issues on lines operating up to 100 MHz.

How does LL4154-7 compare to standard 1N4148 in MiniMELF?

The LL4154-7 offers identical 4.0 ns trr and 4.0 pF Cj as the 1N4148WS variant but increases average forward current rating from 100 mA to 150 mA. It retains the same MiniMELF mechanical form factor and cathode-band marking, enabling drop-in replacement where higher current margin is required.

Can LL4154-7 be used in AC-coupled high-frequency signal paths?

Yes - its 4.0 pF junction capacitance and low leakage (<100 nA at 25 V) make it suitable for AC coupling in signal paths up to ~100 MHz. However, forward conduction must be avoided; biasing must ensure the diode remains reverse-biased during normal signal swing to prevent distortion.