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Microchip Technology CDLL4120
- Part No.:
- CDLL4120
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF
- Datasheet:
-
CDLL4120.pdf
- Description:
- DIODE ZENER 30V 500MW DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,260
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Product details
Overview
CDLL4120 from Microsemi is a hermetically sealed, surface-mount silicon Zener diode in DO-213AA (MELF/LL34) package, rated for 30 V nominal Zener voltage at 250 µA test current, 200 Ω Zener impedance, and 13 mA maximum Zener current - used for precision voltage reference and overvoltage protection in aerospace-grade power regulation circuits.
For engineers reviewing the CDLL4120 datasheet, CDLL4120 pinout, CDLL4120 application, or CDLL4120 equivalent, this part supports low-current, high-stability voltage clamping in harsh-environment analog signal conditioning, DC-DC feedback loops, and MIL-PRF-19500/435-compliant systems requiring ±5% Zener tolerance and operation from –65°C to +175°C.
Technical Context
The CDLL4120 operates as a two-terminal, cathode-banded voltage reference device with metallurgically bonded junctions and hermetic glass encapsulation. Its thermal resistance is 100 °C/W (max) at L = 0 inch, and its axial coefficient of expansion (~6 ppm/°C) requires matched PCB substrate selection for reliability under thermal cycling.
It delivers stable 30 V regulation at 250 µA test current with 200 Ω dynamic impedance, and maintains reverse leakage ≤0.01 µA at 22.8 V - enabling use in ultra-low-power bias networks where leakage-induced error must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 30 V ±5% at IZT = 250 µA - defines precise clamping threshold for feedback and protection circuits |
| Zener Impedance (ZZT) | 200 Ω max - ensures minimal voltage shift under load variation in reference applications |
| Reverse Leakage (IR) | ≤0.01 µA at VR = 22.8 V - critical for low-power bias stability and leakage-sensitive analog stages |
| Max Zener Current (IZM) | 13 mA - sets upper limit for sustained power dissipation without degradation |
| Junction Temp Range | –65°C to +175°C - enables deployment in extended-temperature avionics and downhole electronics |
| Power Dissipation | 500 mW @ TEC = +125°C - defines thermal design margin for surface-mount pad layout and heatsinking |
Pinout & Package
Package: DO-213AA (MELF/LL34), hermetically sealed glass case, lead finish: tin/lead, polarity marked by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward bias; grounded or referenced node in Zener mode | Connected to lower-potential side of regulated circuit; determines orientation on PCB |
| Cathode | Current exit terminal during forward bias; high-side connection in Zener regulation | Banded end - must connect to higher-potential rail to enable reverse breakdown at 30 V |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass sealing | Prevents moisture ingress and long-term parameter drift in high-reliability aerospace environments |
| MIL-PRF-19500/435 qualification | Meets military screening requirements for radiation hardness, thermal shock, and life testing |
| Low 250 µA test current | Enables stable regulation in microamp-level bias networks without loading sensitive sources |
| Metallurgical junction bond | Improves thermal cycling endurance and reduces interfacial resistance versus alloyed junctions |
Applications
| Aerospace Power Monitoring | Downhole Sensor Biasing |
|---|---|
Use Scenario: Real-time monitoring of 28 V aircraft bus voltage with fault detection at ±10% deviation. IC Role / Device Role / Timing Role: Zener reference in comparator input stage for overvoltage/undervoltage trip generation. Use Value: 30 V nominal Zener voltage provides 7% headroom above nominal bus, enabling reliable margin-based thresholding across temperature. | Use Scenario: Providing stable 30 V bias to piezoresistive pressure transducers in oil/gas wellhead electronics. IC Role / Device Role / Timing Role: Precision voltage reference for ratiometric ADC excitation in high-temperature sensor front-ends. Use Value: ±5% tolerance and –65°C to +175°C operation ensure calibration integrity despite extreme thermal gradients. |
| Avionics DC-DC Feedback | MIL-SPEC Test Equipment |
Use Scenario: Secondary-side voltage sensing in isolated flyback converters powering flight control FPGAs. IC Role / Device Role / Timing Role: Zener clamp in optocoupler feedback loop to regulate 3.3 V output with <1% line/load regulation. Use Value: 200 Ω Zener impedance minimizes feedback loop gain variation, improving transient response consistency. | Use Scenario: Calibration reference in portable MIL-STD-461 EMI test receivers operating in field-deployed labs. IC Role / Device Role / Timing Role: Stable 30 V reference for internal DAC offset trimming and ADC full-scale adjustment. Use Value: Hermetic DO-213AA packaging prevents parameter shift during repeated thermal/humidity cycling in mobile test rigs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4120UR-1 | Same Zener voltage (30 V), identical DO-213AA package, but qualified to JANTXV level per MIL-PRF-19500/435 | Higher screening grade - required for Class H (spaceflight) or mission-critical avionics where burn-in and lot acceptance testing are mandated | Select 1N4120UR-1 when full JANTXV conformance documentation and traceability are contractually required |
| BZX84-C30 | SMT SOT-23 package, ±5% tolerance, 200 Ω ZZT, but only rated to +150°C junction temp and not MIL-spec screened | Cost-sensitive industrial designs where extended temperature range and military qualification are not needed | Choose BZX84-C30 for commercial-grade consumer or automotive ECUs with standard reliability requirements |
Compared with CDLL4120, 1N4120UR-1 offers identical electrical specs with enhanced process controls for space-grade use, while BZX84-C30 trades hermeticity and temperature range for lower cost and smaller footprint in non-military applications.
Availability
CDLL4120 is available at Aetrix Electronics and suitable for aerospace power monitoring, downhole sensor biasing, and avionics DC-DC feedback requiring stable component supply with full MIL-PRF-19500 traceability and extended-temperature performance.
Supply support for CDLL4120 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 CDLL series belongs to Microsemi's legacy high-stability Zener diode product line, engineered specifically for MIL-PRF-19500/435 compliance and operation in extreme thermal and radiation environments.
FAQ
What is the Zener voltage tolerance for CDLL4120?
The CDLL4120 has a nominal Zener voltage of 30 V with a tolerance of ±5%, measured at 25°C ambient and 250 µA test current. This tolerance is defined per Note 1 in the official Microsemi datasheet and applies to all CDLL4xxx parts unless modified by a "C" (+2%) or "D" (+1%) suffix - which CDLL4120 does not carry.
Is CDLL4120 suitable for surface-mount assembly?
Yes, CDLL4120 is designed for surface-mount assembly in the DO-213AA (MELF/LL34) package. Its leadless, cylindrical glass body and tin/lead lead finish are compatible with standard reflow profiles for high-reliability SMT processes, and its axial coefficient of expansion (~6 ppm/°C) requires matching to substrate COE for thermal stress mitigation.
What is the maximum reverse leakage current for CDLL4120?
The maximum reverse leakage current for CDLL4120 is 0.01 µA at 22.8 V reverse voltage (76% of nominal Zener voltage), as specified in the Electrical Characteristics table. This ultra-low leakage supports use in high-impedance bias networks where current draw must remain below 10 nA to avoid measurement error.
Does CDLL4120 require derating above +125°C?
Yes, CDLL4120 requires linear power derating above +125°C ambient: 10 mW/°C reduction from the 500 mW maximum rating at TEC = +125°C. This derating is defined in the Maximum Ratings section and must be applied in thermal design to prevent junction overheating in high-temperature enclosures or under sustained load.
Can CDLL4120 replace CDLL4119 in a 28 V system?
No - CDLL4119 is rated for 28 V nominal Zener voltage, while CDLL4120 is rated for 30 V. Substituting CDLL4120 would raise the clamping threshold by 2 V, potentially compromising overvoltage protection margins or feedback accuracy in 28 V systems. Always verify Zener voltage match before interchange, as CDLL4120 is not a drop-in replacement for CDLL4119.
CDLL4120 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AB, MELF
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 30 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 200 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 22.8 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
CDLL4120 FAQ
1.How can I place an order for CDLL4120 through Aetrix?
Please submit a Request for Quotation (RFQ) for CDLL4120 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 CDLL4120 reliable?
The price and inventory of CDLL4120 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CDLL4120 is usually 5 days.
3.What payment methods are accepted for CDLL4120?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CDLL4120 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CDLL4120?
CDLL4120 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CDLL4120 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 CDLL4120?
For technical support, including CDLL4120 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CDLL4120 requirements.
6.How does Aetrix verify that CDLL4120 is sourced from the original manufacturer or authorized distributors?
All CDLL4120 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 CDLL4120 meets industry standards.
7.What is the process for return or replacement of CDLL4120?
All CDLL4120 units undergo pre-shipment inspection (PSI). If there is an issue with CDLL4120, 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 CDLL4120 part is unused and in its original packaging.
Return procedure for CDLL4120:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CDLL4120 Tags
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