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

Microchip Technology CDLL4111

Name: CDLL4111
Brand: Microchip Technology
SKU: CDLL4111
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CDLL4111

Manufacturer:: Microchip Technology

Category:: Single Zener Diodes

Package:: DO-213AB, MELF

Datasheet:: CDLL4111.pdf

Description:: DIODE ZENER 17V 500MW DO213AB

Quantity:: RFQ Add To RFQ list

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Inventory:6,164

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Product details

Overview

CDLL4111 from Microsemi is a hermetically sealed, surface-mount silicon Zener diode in DO-213AA (MELF/LL34) package, rated for 17 V nominal Zener voltage at 250 µA test current, 100 Ω maximum Zener impedance, 0.05 µA maximum reverse leakage at 12.92 V, and 22 mA maximum Zener current. It operates across -65°C to +175°C junction temperature and is used for precision voltage reference and overvoltage protection in aerospace power conditioning circuits.

For engineers reviewing the CDLL4111 datasheet, CDLL4111 pinout, CDLL4111 application, or CDLL4111 equivalent, key selection criteria include its ±5% Zener tolerance, low-leakage performance at high reverse bias, thermal stability up to +175°C, and compatibility with high-reliability MELF mounting on ceramic substrates requiring matched CTE.

Technical Context

The CDLL4111 functions as a two-terminal voltage reference device with cathode-banded polarity, designed for operation in the reverse breakdown region. Its metallurgically bonded construction ensures long-term stability under thermal cycling, and its hermetic glass package meets MIL-PRF-19500/435 for space-grade reliability.

It delivers stable regulation at low test current (250 µA), exhibits 100 °C/W maximum junction-to-case thermal resistance, and maintains specified Zener characteristics only when mounted on surfaces with coefficient of expansion matched to its +6 ppm/°C axial CTE - critical for minimizing mechanical stress in launch-vibration environments.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	17 V nominal at I_ZT = 250 µA; ±5% tolerance ensures predictable clamping in regulated power rails
Zener Impedance (Z_ZT)	≤100 Ω at 250 µA; limits output voltage variation under load transients
Reverse Leakage (I_R)	≤0.05 µA at V_R = 12.92 V; enables ultra-low standby current in battery-backed systems
Max Zener Current (I_ZM)	22 mA; defines safe continuous dissipation limit at T_J ≤ +125°C
Junction Temp Range	-65°C to +175°C; supports operation in engine bay, satellite payload, and downhole electronics
Package	DO-213AA (MELF/LL34); hermetically sealed glass case for moisture and particle immunity
Power Dissipation	500 mW at T_EC = +125°C; derates linearly at 10 mW/°C above that temperature

Pinout & Package

DO-213AA (MELF/LL34) hermetic glass package: cylindrical, leadless, axial symmetry; cathode identified by single dark band; no leads - soldered directly to PCB pads or ceramic substrate.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / Reverse breakdown reference node	Connected to lower-potential rail; forms reference point for voltage regulation loop
Cathode	Reverse breakdown terminal / Zener output node	Banded end; connected to regulated output or clamp node; must be held at higher potential than anode

Key Features

Feature	Design Value
Hermetic glass sealing	Prevents moisture ingress and contamination, enabling >20-year shelf life and mission-critical reliability per MIL-PRF-19500/435
Metallurgical bonding	Eliminates wire bonds and interfacial delamination risk under thermal shock and vibration
+6 ppm/°C axial CTE	Enables direct mounting on alumina or beryllia substrates without stress-induced parameter drift
Low 250 µA test current	Reduces quiescent power draw in always-on monitoring circuits and telemetry front-ends
175°C max junction temperature	Supports placement near high-power converters or in uncooled avionics enclosures

Applications

Avionics Power Sequencing	Satellite Bus Voltage Monitoring
Use Scenario: Regulating auxiliary 15–18 V rail during cold-start sequencing in flight control computers. IC Role / Device Role / Timing Role: Zener reference element in discrete shunt regulator providing stable enable threshold for DC-DC controllers. Use Value: Tight 17 V ±5% tolerance and low 0.05 µA leakage ensure accurate power-up timing and minimal battery drain during pre-launch storage.	Use Scenario: Overvoltage clamp on 16 V primary bus in LEO satellite power distribution unit. IC Role / Device Role / Timing Role: Fail-safe crowbar element triggered during solar array transient events. Use Value: Hermetic DO-213AA package withstands vacuum outgassing and radiation-induced parametric shift better than plastic-packaged alternatives.
Downhole Sensor Signal Conditioning	Aerospace ECU Reference Calibration
Use Scenario: Providing stable 17 V reference for analog front-end amplifiers in oil-well pressure transducers operating at 150°C ambient. IC Role / Device Role / Timing Role: Precision voltage reference for ADC biasing and sensor excitation circuitry. Use Value: Junction temperature rating up to +175°C and CTE-matched mounting allow calibration stability over full operational range without drift compensation.	Use Scenario: Factory-trimmed reference in engine control unit (ECU) diagnostic self-test circuitry. IC Role / Device Role / Timing Role: Known-good voltage source for verifying ADC linearity and DAC output accuracy during production test. Use Value: Metallurgically bonded construction ensures zero parameter shift after thermal cycling and burn-in, guaranteeing test repeatability across 10,000+ units.

Avionics Power Sequencing

Satellite Bus Voltage Monitoring

Use Scenario: Regulating auxiliary 15–18 V rail during cold-start sequencing in flight control computers.

IC Role / Device Role / Timing Role: Zener reference element in discrete shunt regulator providing stable enable threshold for DC-DC controllers.

Use Value: Tight 17 V ±5% tolerance and low 0.05 µA leakage ensure accurate power-up timing and minimal battery drain during pre-launch storage.

Use Scenario: Overvoltage clamp on 16 V primary bus in LEO satellite power distribution unit.

IC Role / Device Role / Timing Role: Fail-safe crowbar element triggered during solar array transient events.

Use Value: Hermetic DO-213AA package withstands vacuum outgassing and radiation-induced parametric shift better than plastic-packaged alternatives.

Downhole Sensor Signal Conditioning

Aerospace ECU Reference Calibration

Use Scenario: Providing stable 17 V reference for analog front-end amplifiers in oil-well pressure transducers operating at 150°C ambient.

IC Role / Device Role / Timing Role: Precision voltage reference for ADC biasing and sensor excitation circuitry.

Use Value: Junction temperature rating up to +175°C and CTE-matched mounting allow calibration stability over full operational range without drift compensation.

Use Scenario: Factory-trimmed reference in engine control unit (ECU) diagnostic self-test circuitry.

IC Role / Device Role / Timing Role: Known-good voltage source for verifying ADC linearity and DAC output accuracy during production test.

Use Value: Metallurgically bonded construction ensures zero parameter shift after thermal cycling and burn-in, guaranteeing test repeatability across 10,000+ units.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4106UR-1	12 V nominal Zener voltage; same DO-213AA package, ±5% tolerance, 200 Ω Z_ZT	Lower voltage clamping; unsuitable for 17 V rail protection but valid for 12 V logic supply regulation	Select only if system requires 12 V reference and shares identical thermal/mounting constraints
CDLL4110	16 V nominal Zener voltage; identical package, test current, and leakage spec; 100 Ω Z_ZT	Narrower voltage margin vs. 17 V target; may not meet minimum overvoltage trip threshold in safety-critical designs	Acceptable where 16 V tolerance stack-up allows; verify worst-case V_Z +5% (16.8 V) satisfies design margin

Compared with CDLL4111, 1N4106UR-1 offers lower voltage regulation at higher impedance, while CDLL4110 provides closer voltage match but reduced headroom - both require revalidation of thermal derating and CTE matching for the specific PCB substrate.

Availability

CDLL4111 is available at Aetrix Electronics and suitable for aerospace power sequencing, satellite bus monitoring, downhole sensor conditioning, and aerospace ECU calibration requiring stable component supply across extended temperature and radiation environments.

Supply support for CDLL4111 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, radiation-hardened, and military-grade analog and mixed-signal components.

The CDLL4111 belongs to Microsemi's legacy MIL-PRF-19500/435-certified Zener diode family, engineered for voltage reference and overvoltage protection in mission-critical aerospace, defense, and industrial systems where long-term parametric stability is non-negotiable.

FAQ

What is the Zener voltage tolerance for CDLL4111?

The CDLL4111 has a nominal Zener voltage of 17 V with a tolerance of ±5%, as specified in Note 1 of the official Microsemi datasheet. This tolerance applies when measured at 25°C ±3°C ambient with the device in thermal equilibrium. No "C" (±2%) or "D" (±1%) suffix is present in the CDLL4111 part number, confirming the standard ±5% grade.

Does CDLL4111 have a cathode band, and how is polarity identified?

Yes, CDLL4111 uses cathode-band polarity marking: a single dark band on the glass body identifies the cathode terminal. The device must be operated with the banded end at higher potential than the anode to function in reverse breakdown. This marking is consistent across all DO-213AA-packaged devices in the CDLL4099–CDLL4135 series.

What is the maximum power dissipation for CDLL4111 at 150°C ambient?

At 150°C end-cap temperature (T_EC), CDLL4111's power dissipation must be derated from its 500 mW rating at 125°C. Using the 10 mW/°C derating factor, maximum dissipation is 500 mW − (150 − 125) × 10 mW = 250 mW. Exceeding this risks thermal runaway or accelerated parameter drift.

Is CDLL4111 suitable for use in vacuum environments such as satellite payloads?

Yes, CDLL4111 is explicitly qualified for vacuum use due to its hermetically sealed DO-213AA glass package, which prevents outgassing and internal contamination. Its compliance with MIL-PRF-19500/435 and tested performance up to +175°C make it suitable for LEO and GEO satellite bus protection and reference applications.

What is the Zener impedance measurement condition for CDLL4111?

CDLL4111's Zener impedance (Z_ZT) of ≤100 Ω is measured at I_ZT = 250 µA with a superimposed 60 Hz RMS AC current equal to 10% of I_ZT (i.e., 25 µA RMS), per Note 2 in the Microsemi datasheet. This small-signal AC method reflects dynamic impedance under typical regulation conditions.

CDLL4111 Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: DO-213AB, MELF

Packaging:: Bulk

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 17 V

Tolerance:: ±5%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 100 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 13 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

CDLL4111 FAQ

1.How can I place an order for CDLL4111 through Aetrix?

Please submit a Request for Quotation (RFQ) for CDLL4111 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 CDLL4111 reliable?

The price and inventory of CDLL4111 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CDLL4111 is usually 5 days.

3.What payment methods are accepted for CDLL4111?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CDLL4111 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CDLL4111?

CDLL4111 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CDLL4111 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 CDLL4111?

For technical support, including CDLL4111 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CDLL4111 requirements.

6.How does Aetrix verify that CDLL4111 is sourced from the original manufacturer or authorized distributors?

All CDLL4111 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 CDLL4111 meets industry standards.

7.What is the process for return or replacement of CDLL4111?

All CDLL4111 units undergo pre-shipment inspection (PSI). If there is an issue with CDLL4111, 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 CDLL4111 part is unused and in its original packaging.

Return procedure for CDLL4111:

1.Submit a request within 90 days.

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

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