Microchip Technology CDLL5524B

Overview

CDLL5524B from Microsemi is a hermetically sealed, glass-encapsulated 5.6V Zener diode in DO-213AA (MELF/SOD-80/LL34) package, rated for 500mW power dissipation at +125°C, with 3.0µA max reverse leakage at 2.0V and 30Ω max zener impedance at 3.0mA test current. It serves as a precision voltage reference or overvoltage clamp in high-reliability analog signal conditioning circuits.

For engineers reviewing the CDLL5524B datasheet, CDLL5524B pinout, CDLL5524B application, or CDLL5524B equivalent, key selection criteria include its ±5% zener voltage tolerance (B-suffix), low 3.0µA reverse leakage at VR = 2.0V, 30Ω dynamic impedance, hermetic MELF construction, and MIL-PRF-19500/437 qualification for aerospace and defense systems.

Technical Context

The CDLL5524B operates as a two-terminal voltage-regulating device with cathode-banded polarity, requiring forward bias for conduction and reverse bias for zener breakdown regulation. Its junction temperature range spans –65°C to +175°C, and thermal resistance RθJEC is ≤100°C/W at L = 0 inch.

It is metallurgically bonded and qualified to MIL-PRF-19500/437 Level JANTXV, supporting stable operation under thermal cycling and high-reliability environmental stress. The device exhibits 0.30µA max reverse leakage at VR = 3.0V and 0.01µA at VR = 5.0V, per specified test conditions.

Key Specifications

Pinout & Package

CDLL5524B is a two-terminal axial device in DO-213AA (MELF) glass package. Polarity is marked by a cathode band; the banded end is the cathode (K), and the unmarked end is the anode (A). No PCB pad layout deviation is required versus standard SOD-80 footprints.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N5524B, CDLL5524B offers identical performance with Microsemi-specific quality documentation; versus SMF5.6A, it delivers superior leakage, impedance, and environmental ruggedness-justifying its use where reliability outweighs cost.

Availability

CDLL5524B is available at Aetrix Electronics and suitable for aerospace power monitoring, industrial sensor signal conditioning, and downhole oilfield instrumentation requiring stable component supply across extended product lifecycles.

Supply support for CDLL5524B 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

Microsemi Corporation (now part of Microchip Technology) designs high-reliability analog and mixed-signal semiconductors for aerospace, defense, and industrial markets.

The CDLL55xx series was developed specifically for MIL-PRF-19500/437-compliant Zener reference applications demanding hermetic packaging, extended temperature operation, and guaranteed parametric limits across all six electrical parameters.

FAQ

What is the nominal zener voltage and tolerance of CDLL5524B?

The CDLL5524B has a nominal zener voltage of 5.6V with a ±5% tolerance, as indicated by the "B" suffix per LDS-0037 Rev. 1. This tolerance applies to all six guaranteed parameters-including V_Z, reverse leakage, and zener impedance-and is verified under MIL-PRF-19500/437 JANTXV screening. The CDLL5524B achieves this tight tolerance without binning, simplifying inventory and design validation.

Is CDLL5524B hermetically sealed, and what package does it use?

Yes, CDLL5524B is hermetically sealed in a glass DO-213AA package-also known as MELF, SOD-80, or LL34. This construction prevents moisture ingress and parameter drift over time, supporting long-term stability in high-humidity or high-vacuum environments. The axial symmetry and tin/lead lead finish enable reliable reflow soldering and automated placement in high-reliability assembly lines.

What is the maximum reverse leakage current for CDLL5524B, and at what voltage is it measured?

The maximum reverse leakage current for CDLL5524B is 3.0µA at V_R = 2.0V, and 0.01µA at V_R = 5.0V, per the Electrical Characteristics table in LDS-0037 Rev. 1. These values reflect strict screening under MIL-PRF-19500/437 and confirm suitability for low-power bias networks and high-impedance reference applications where leakage-induced error must be minimized.

Does CDLL5524B meet any military specifications?

Yes, CDLL5524B is qualified per MIL-PRF-19500/437 at the JANTXV level, which includes rigorous environmental testing for temperature cycling, mechanical shock, vibration, and hermeticity. This qualification ensures consistent performance in aerospace, defense, and other mission-critical applications where failure is not an option. Full test reports and lot traceability are available upon request for CDLL5524B.

What is the power derating behavior of CDLL5524B above +125°C?

CDLL5524B has a power derating slope of 10mW/°C above +125°C ambient case temperature (T_EC). Starting from its rated 500mW at +125°C, power capability linearly decreases-for example, to 450mW at +130°C and 400mW at +135°C. This behavior is defined in the Maximum Ratings table of LDS-0037 Rev. 1 and must be applied in thermal design to avoid exceeding junction temperature limits.