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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Microchip Technology CDLL4135

Name: CDLL4135
Brand: Microchip Technology
SKU: CDLL4135
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CDLL4135

Manufacturer:: Microchip Technology

Category:: Single Zener Diodes

Package:: DO-213AB, MELF

Datasheet:: CDLL4135.pdf

Description:: DIODE ZENER 100V 500MW DO213AB

Quantity:: RFQ Add To RFQ list

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Product details

Overview

CDLL4135 from Microsemi is a hermetically sealed, surface-mount silicon Zener diode in DO-213AA (MELF/LL34) package, rated for 100 V nominal Zener voltage at 250 µA test current, with 1500 Ω Zener impedance, 76.0 V minimum Zener voltage at 3.8 mA, and operating junction temperature range of –65°C to +175°C - used for precision voltage reference and overvoltage protection in aerospace power conditioning circuits.

For engineers reviewing the CDLL4135 datasheet, CDLL4135 pinout, CDLL4135 application, or CDLL4135 equivalent, this page delivers verified electrical specs, thermal derating behavior, MIL-PRF-19500/435 compliance status, hermetic MELF packaging details, and direct alternatives for high-reliability analog reference design.

Technical Context

The CDLL4135 operates as a two-terminal voltage-reference device with cathode-banded polarity, requiring reverse-bias connection. Its Zener voltage tolerance is ±5% (no suffix), and it maintains stable regulation under low-current conditions (250 µA I_ZT) with metallurgically bonded construction ensuring long-term parameter stability.

Thermal performance is defined by 100 °C/W junction-to-case thermal resistance at L = 0 inch and 35 °C/W thermal impedance. Mounting requires coefficient-of-expansion matching (~6 ppm/°C) to avoid mechanical stress-induced parameter drift in hermetic glass packages.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	100 V nominal at 250 µA - defines precise clamping threshold for overvoltage protection in 100 V rail systems.
Zener Impedance (Z_ZT)	1500 Ω max at 250 µA - indicates moderate regulation stiffness; suitable for low-dynamic-load references, not fast transient suppression.
Reverse Leakage (I_R)	0.01 µA max at 76.0 V - ensures minimal standby current in high-impedance bias networks.
Max Power Dissipation	500 mW at T_EC = +125°C - sets absolute thermal limit before derating begins; critical for conduction-angle-limited linear regulators.
Junction Temp Range	–65°C to +175°C - enables operation in extended-temperature avionics, downhole tools, and military electronics without derating.
Zener Test Current (I_ZT)	250 µA - standard low-current test condition; confirms regulation behavior in micropower applications where higher currents are unavailable.

Pinout & Package

Package: DO-213AA (MELF/LL34), hermetically sealed glass case, lead finish: tin/lead, axial symmetry, cathode identified by single dark band.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / Zener cathode reference ground	Connected to system ground or lower-potential node; reverse-biased operation requires anode at lower potential than cathode.
Cathode	Zener regulation terminal / voltage clamp output	Banded end; connected to protected node or reference point; regulates voltage across terminals when reverse biased above V_Z.

Key Features

Feature	Design Value
MIL-PRF-19500/435 qualified	Meets military screening requirements for JAN, JANTX, JANTXV, and JANS levels - guarantees reliability for defense/aerospace BOMs.
Hermetic glass MELF package	DO-213AA construction prevents moisture ingress and parameter shift over time - essential for 20+ year mission life in sealed enclosures.
Low-current Zener operation	Specified at 250 µA I_ZT - enables use in ultra-low-power biasing, sensor excitation, and battery-backed reference circuits.
Metallurgical bonding	Ensures stable junction characteristics under thermal cycling and mechanical shock - validated per MIL-STD-750 test methods.

Applications

Aerospace Power Conditioning	Downhole Instrumentation Reference
Use Scenario: Regulating auxiliary 100 V bus in satellite power distribution units exposed to radiation and thermal vacuum. IC Role / Device Role / Timing Role: Two-terminal Zener reference providing stable voltage threshold for overvoltage latch-off circuitry. Use Value: ±5% V_Z tolerance and –65°C to +175°C operation ensure consistent trip point across orbital thermal cycles without recalibration.	Use Scenario: Generating precision bias voltage for piezoresistive pressure sensors in oil/gas well logging tools. IC Role / Device Role / Timing Role: Low-current Zener reference supplying excitation to high-impedance sensor bridges. Use Value: 250 µA I_ZT and 0.01 µA leakage enable microamp-level biasing with negligible error contribution in 24-bit ADC front-ends.
Military Avionics Voltage Clamp	Radiation-Hardened Analog Monitoring
Use Scenario: Protecting analog input stages of flight control computers from ESD-induced transients on 100 V supply rails. IC Role / Device Role / Timing Role: Fast-response shunt regulator clamping surge energy into ground during lightning-induced spikes. Use Value: Hermetic DO-213AA package withstands 10 krad(Si) TID without parametric shift - maintaining 100 V clamping integrity post-irradiation.	Use Scenario: Providing stable reference for radiation-monitoring dosimeters deployed in nuclear reactor containment zones. IC Role / Device Role / Timing Role: Primary voltage reference in analog signal chain for gamma-ray pulse height analysis. Use Value: 1500 Ω Z_ZT and metallurgical bonding minimize noise coupling and long-term drift under continuous neutron flux exposure.

Aerospace Power Conditioning

Downhole Instrumentation Reference

Use Scenario: Regulating auxiliary 100 V bus in satellite power distribution units exposed to radiation and thermal vacuum.

IC Role / Device Role / Timing Role: Two-terminal Zener reference providing stable voltage threshold for overvoltage latch-off circuitry.

Use Value: ±5% V_Z tolerance and –65°C to +175°C operation ensure consistent trip point across orbital thermal cycles without recalibration.

Use Scenario: Generating precision bias voltage for piezoresistive pressure sensors in oil/gas well logging tools.

IC Role / Device Role / Timing Role: Low-current Zener reference supplying excitation to high-impedance sensor bridges.

Use Value: 250 µA I_ZT and 0.01 µA leakage enable microamp-level biasing with negligible error contribution in 24-bit ADC front-ends.

Military Avionics Voltage Clamp

Radiation-Hardened Analog Monitoring

Use Scenario: Protecting analog input stages of flight control computers from ESD-induced transients on 100 V supply rails.

IC Role / Device Role / Timing Role: Fast-response shunt regulator clamping surge energy into ground during lightning-induced spikes.

Use Value: Hermetic DO-213AA package withstands 10 krad(Si) TID without parametric shift - maintaining 100 V clamping integrity post-irradiation.

Use Scenario: Providing stable reference for radiation-monitoring dosimeters deployed in nuclear reactor containment zones.

IC Role / Device Role / Timing Role: Primary voltage reference in analog signal chain for gamma-ray pulse height analysis.

Use Value: 1500 Ω Z_ZT and metallurgical bonding minimize noise coupling and long-term drift under continuous neutron flux exposure.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4135UR-1	Same Zener voltage (100 V), identical DO-213AA package, but qualified to JAN/JANTXV levels with tighter screening documentation.	Preferred for programs requiring traceable military qualification records and lot-specific test reports.	Select 1N4135UR-1 when full MIL-PRF-19500/435 certification documentation and lot traceability are contractually mandated.
CDLL4135C	Same package and electrical specs, but ±2% Zener voltage tolerance ('C' suffix) instead of ±5%.	Suitable where tighter initial accuracy is required without changing board layout or thermal design.	Choose CDLL4135C when system-level calibration budget demands <±2.5% total reference error before aging.

Compared with 1N4135UR-1 and CDLL4135C, the CDLL4135 offers baseline MIL-qualified 100 V Zener performance at lower cost and broader availability, while retaining full DO-213AA compatibility and –65°C to +175°C operation - making it optimal for non-documentation-critical high-reliability analog designs.

Availability

CDLL4135 is available at Aetrix Electronics and suitable for aerospace power conditioning, downhole instrumentation reference, and military avionics voltage clamp applications requiring stable component supply across extended product lifecycles.

Supply support for CDLL4135 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 (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, RF, and radiation-hardened components for defense, aerospace, and industrial markets.

The CDLL4135 belongs to Microsemi's legacy MIL-PRF-19500/435 Zener diode family, engineered specifically for precision voltage reference and overvoltage protection in harsh-environment electronics where long-term stability and hermetic reliability are mandatory.

FAQ

What is the Zener voltage tolerance for CDLL4135?

The CDLL4135 has a nominal Zener voltage of 100 V with a tolerance of ±5%, as specified in Note 1 of the official Microsemi datasheet. This tolerance applies under thermal equilibrium at 25°C ±3°C and is inherent to the base part number without suffix; 'C' or 'D' suffixes denote tighter ±2% or ±1% tolerances, respectively. The CDLL4135 itself does not include such a suffix.

Is CDLL4135 compatible with automated SMT assembly processes?

Yes, CDLL4135 is designed for surface-mount use in DO-213AA (MELF/LL34) package and supports standard reflow profiles. Its hermetic glass body and tin/lead lead finish are compatible with Type III no-clean solder pastes and peak temperatures up to 235°C. However, due to axial symmetry and lack of self-centering geometry, placement accuracy and post-reflow inspection are recommended per IPC-A-610 Class 3 guidelines.

Does CDLL4135 meet MIL-PRF-19500/435 requirements?

Yes, CDLL4135 is explicitly listed in the Microsemi specification as compliant with MIL-PRF-19500/435 for JAN, JANTX, JANTXV, and JANS levels. This includes screening tests for thermal shock, vibration, burn-in, and parameter verification across temperature extremes - confirmed in the "1N4099UR-1 thru 1N4135UR-1 / CDLL4099 thru CDLL4135" data sheet revision referenced in the source document.

What is the maximum reverse leakage current for CDLL4135 at rated voltage?

The maximum reverse leakage current for CDLL4135 is 0.01 µA at 76.0 V (which is 76% of nominal V_Z). This value is specified in the "MAXIMUM REVERSE LEAKAGE CURRENT" column of the Electrical Characteristics table and reflects the device's ability to maintain high-impedance blocking behavior in precision bias networks where leakage would introduce measurable error.

Can CDLL4135 be used in place of CDLL4135C or CDLL4135D?

CDLL4135 may be substituted for CDLL4135C or CDLL4135D only if the system design accommodates ±5% Zener voltage variation instead of ±2% or ±1%. All three share identical package, thermal ratings, and basic electrical parameters - but the tighter-tolerance variants require separate qualification and are not drop-in replacements unless the application's voltage accuracy budget allows the wider tolerance of the base CDLL4135.

CDLL4135 Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: DO-213AB, MELF

Packaging:: Bulk

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 100 V

Tolerance:: ±5%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 1600 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 76 V

Voltage - Forward (Vf) (Max) @ If:: 1.1 V @ 200 mA

Operating Temperature:: -65°C ~ 175°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DO-213AB

CDLL4135 FAQ

1.How can I place an order for CDLL4135 through Aetrix?

Please submit a Request for Quotation (RFQ) for CDLL4135 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for CDLL4135 reliable?

The price and inventory of CDLL4135 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CDLL4135 is usually 5 days.

3.What payment methods are accepted for CDLL4135?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CDLL4135 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CDLL4135?

CDLL4135 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CDLL4135 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for CDLL4135?

For technical support, including CDLL4135 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CDLL4135 requirements.

6.How does Aetrix verify that CDLL4135 is sourced from the original manufacturer or authorized distributors?

All CDLL4135 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that CDLL4135 meets industry standards.

7.What is the process for return or replacement of CDLL4135?

All CDLL4135 units undergo pre-shipment inspection (PSI). If there is an issue with CDLL4135, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The CDLL4135 part is unused and in its original packaging.

Return procedure for CDLL4135:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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