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Microchip Technology CDLL4109
- Part No.:
- CDLL4109
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF
- Datasheet:
-
CDLL4109.pdf
- Description:
- DIODE ZENER 15V 500MW DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,261
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Product details
Overview
CDLL4109 from Microsemi is a hermetically sealed, surface-mount silicon Zener diode in DO-213AA (MELF/LL34) package, rated for 15 V nominal Zener voltage at 250 µA test current, 100 Ω Zener impedance, 0.05 µA reverse leakage at 11.4 V, and 25 mA maximum Zener current - used for precision voltage reference and regulation in aerospace power conditioning circuits.
For engineers reviewing the CDLL4109 datasheet, CDLL4109 pinout, CDLL4109 application, or CDLL4109 equivalent, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (100 °C/W), junction temperature range (–65°C to +175°C), low-current operation capability (250 µA), and hermetic glass packaging for high-reliability environments.
Technical Context
The CDLL4109 operates as a two-terminal voltage-reference device with cathode-banded polarity, requiring reverse-bias connection. Its Zener breakdown mechanism delivers stable regulation under low-current conditions (250 µA), with impedance measured using 25 µA AC superimposed on DC bias per MIL-PRF-19500/435.
Designed for hermetic reliability, it features metallurgically bonded construction and a thermal expansion coefficient of +6 ppm/°C, necessitating matched COE mounting surfaces. Power dissipation is derated linearly above +125°C ambient (10 mW/°C), with max 500 mW at TEC = +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 15 V ±5% at 250 µA - defines regulated output voltage under standard test condition |
| Zener Impedance | 100 Ω max at 250 µA - indicates voltage stability under small-signal AC variation |
| Reverse Leakage | 0.05 µA max at 11.4 V - ensures minimal parasitic current in standby regulation |
| Max Zener Current | 25 mA - sets absolute upper limit for continuous power handling without degradation |
| Junction Temp Range | –65°C to +175°C - enables operation in extreme aerospace and military environments |
| Power Dissipation | 500 mW @ TEC = +125°C - defines thermal envelope before derating applies |
| Package | DO-213AA (MELF/LL34) - hermetically sealed glass case for moisture and particle immunity |
Pinout & Package
DO-213AA (MELF/LL34) hermetically sealed glass package with axial leads; banded end denotes cathode terminal. No discrete pins - two-terminal device with polarity-marked cylindrical body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener reference ground node | Connected to circuit common when used in reverse-biased regulation configuration |
| Cathode (banded) | Reverse-bias input / regulated output node | Connected to unregulated supply; output voltage referenced to anode potential |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic Glass Construction | Prevents moisture ingress and contamination, supporting MIL-PRF-19500/435 qualification |
| Low-Current Regulation | Stable 15 V Zener operation at 250 µA - suitable for ultra-low-power bias networks |
| High-Temperature Operation | Junction storage up to +175°C - compatible with engine bay, avionics, and downhole electronics |
| Metallurgical Bonding | Ensures mechanical robustness and long-term parameter stability under thermal cycling |
| Controlled Thermal Expansion | +6 ppm/°C axial COE - enables reliable solder joint integrity on matched PCB substrates |
Applications
| Avionics Power Reference | Satellite DC-DC Feedback |
|---|---|
Use Scenario: Precision voltage reference in triple-redundant power supply monitors aboard commercial aircraft flight control systems. IC Role / Device Role / Timing Role: Zener reference element in op-amp-based error amplifier feedback loop. Use Value: ±5% tolerance and –65°C to +175°C operation ensure consistent regulation across cabin-to-stratosphere thermal profiles. | Use Scenario: Stable 15 V reference for isolated feedback optocoupler in radiation-hardened satellite DC-DC converters. IC Role / Device Role / Timing Role: Primary voltage setpoint generator defining output regulation accuracy. Use Value: Hermetic DO-213AA packaging prevents parametric drift in vacuum and ionizing radiation environments. |
| Military Radar Bias Network | Downhole Oilfield Sensor Supply |
Use Scenario: Low-current bias source for GaN HEMT gate drivers in pulsed radar transmitter modules. IC Role / Device Role / Timing Role: Zener clamp establishing fixed negative gate bias voltage during RF pulse off-time. Use Value: 100 Ω Zener impedance minimizes transient voltage overshoot during fast switching transitions. | Use Scenario: Voltage reference for analog front-end of high-temperature pressure transducers deployed at 175°C wellbore depths. IC Role / Device Role / Timing Role: Core regulation node in 3.3 V LDO pre-regulator stage. Use Value: Validated operation up to +175°C junction temperature eliminates need for external thermal derating circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4109UR-1 | Same electrical specs; JAN-certified version with MIL-PRF-19500/435 compliance and extended screening | Required for DoD procurement; includes additional environmental stress testing | Select when full military qualification and traceability are mandated |
| BZX84-C15 | Surface-mount SOT-23 package; ±5% tolerance; 150 Ω ZZT; 100 mW PD; not hermetic | Cost-sensitive industrial designs where MIL-spec reliability is not required | Choose for commercial-grade volume production with PCB space constraints |
Compared with CDLL4109, 1N4109UR-1 offers identical Zener performance with certified military screening, while BZX84-C15 trades hermetic reliability and high-temp capability for compact size and lower cost - making CDLL4109 optimal for mission-critical aerospace and defense systems demanding proven long-term stability.
Availability
CDLL4109 is available at Aetrix Electronics and suitable for avionics power reference, satellite DC-DC feedback, and military radar bias network applications requiring stable component supply across extended temperature and radiation-exposed environments.
Supply support for CDLL4109 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 and mixed-signal ICs, RF solutions, and radiation-hardened components.
The CDLL4109 belongs to Microsemi's legacy high-reliability Zener diode family designed specifically for aerospace, defense, and industrial applications requiring hermetic sealing, wide temperature operation, and MIL-qualified consistency.
FAQ
What is the Zener voltage tolerance for CDLL4109?
The CDLL4109 has a nominal Zener voltage of 15 V with a tolerance of ±5%, as specified in Note 1 of the official Microsemi datasheet. This tolerance is measured at 25°C ambient with the device junction in thermal equilibrium. A "C" suffix would indicate ±2%, and "D" would indicate ±1%, but CDLL4109 carries no such suffix and therefore adheres strictly to the ±5% specification.
Is CDLL4109 suitable for high-temperature environments?
Yes, CDLL4109 is rated for junction and storage temperatures from –65°C to +175°C, making it suitable for high-temperature applications including downhole oilfield sensors and engine-mounted avionics. Its hermetic DO-213AA package and metallurgical bonding ensure parameter stability under sustained thermal stress, and its power dissipation is derated only above +125°C ambient.
What does the "CDLL" prefix signify in CDLL4109?
The "CDLL" prefix identifies this as Microsemi's commercial-grade, hermetically sealed, low-leakage Zener diode series in DO-213AA (MELF/LL34) packaging. It distinguishes the part from the military-grade "1N4xxxUR-1" variants (e.g., 1N4109UR-1), which share identical electrical characteristics but undergo additional MIL-PRF-19500/435 screening and certification.
How is Zener impedance measured for CDLL4109?
Zener impedance for CDLL4109 is measured per Note 2: a 60 Hz RMS AC current equal to 10% of the DC test current (25 µA AC superimposed on 250 µA DC) is applied, yielding a maximum value of 100 Ω. This method reflects dynamic regulation performance under small-signal perturbations, critical for feedback stability in precision power supplies.
Can CDLL4109 be used in place of 1N4109UR-1?
CDLL4109 shares identical electrical specifications with 1N4109UR-1, including 15 V Zener voltage, 100 Ω impedance, and 0.05 µA leakage. However, 1N4109UR-1 is fully MIL-PRF-19500/435 qualified with extended screening; CDLL4109 is commercial-grade. Substitution is acceptable only if military qualification is not contractually required - always verify procurement specifications before interchange.
CDLL4109 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AB, MELF
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 15 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 100 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 11.4 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
CDLL4109 FAQ
1.How can I place an order for CDLL4109 through Aetrix?
Please submit a Request for Quotation (RFQ) for CDLL4109 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 CDLL4109 reliable?
The price and inventory of CDLL4109 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CDLL4109 is usually 5 days.
3.What payment methods are accepted for CDLL4109?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CDLL4109 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CDLL4109?
CDLL4109 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CDLL4109 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 CDLL4109?
For technical support, including CDLL4109 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CDLL4109 requirements.
6.How does Aetrix verify that CDLL4109 is sourced from the original manufacturer or authorized distributors?
All CDLL4109 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 CDLL4109 meets industry standards.
7.What is the process for return or replacement of CDLL4109?
All CDLL4109 units undergo pre-shipment inspection (PSI). If there is an issue with CDLL4109, 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 CDLL4109 part is unused and in its original packaging.
Return procedure for CDLL4109:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CDLL4109 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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