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Microchip Technology CDLL4125
- Part No.:
- CDLL4125
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF
- Datasheet:
-
CDLL4125.pdf
- Description:
- DIODE ZENER 47V 500MW DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,030
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Product details
Overview
CDLL4125 from Microsemi is a hermetically sealed, surface-mount silicon Zener diode in DO-213AA (MELF/LL34) package, rated for 47 V nominal Zener voltage at 250 µA test current, 250 Ω maximum Zener impedance, and 8.1 mA maximum Zener current, used for precision voltage regulation in aerospace and industrial power supply reference circuits.
For engineers reviewing the CDLL4125 datasheet, CDLL4125 pinout, CDLL4125 application, or CDLL4125 equivalent, key selection factors include its ±5% Zener tolerance, 35.75 V minimum reverse breakdown voltage, -65°C to +175°C junction temperature range, low-leakage performance (<0.01 µA at 35.75 V), and hermetic glass MELF construction for high-reliability environments.
Technical Context
The CDLL4125 operates as a two-terminal voltage reference device with metallurgically bonded junction and axial coefficient of expansion (~+6 ppm/°C) matched for stable mounting on compatible substrates. It delivers regulated output under reverse-biased conditions with specified Zener impedance measured using 25 µA AC superimposed on 250 µA DC test current.
Its thermal resistance is 100 °C/W at L = 0 inch, and thermal impedance is 35 °C/W, enabling operation up to 175°C junction temperature with appropriate derating above +125°C ambient - supporting use in high-temperature avionics and downhole instrumentation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 47 V nominal at 250 µA; ±5% tolerance ensures predictable clamping in reference designs |
| Minimum Breakdown Voltage (VR) | 35.75 V at IR = 0.01 µA; defines reliable turn-on threshold for overvoltage protection |
| Zener Impedance (ZZT) | 250 Ω max at 250 µA; limits regulation error under varying load current |
| Maximum Zener Current (IZM) | 8.1 mA; sets upper limit for continuous power dissipation without thermal runaway |
| Junction Temperature Range | -65°C to +175°C; enables deployment in extreme-environment systems without derating penalties |
| Power Dissipation | 500 mW at TEC = +125°C; supports stable operation in conduction-cooled modules |
| Leakage Current | <0.01 µA at 35.75 V; minimizes standby power loss in battery-backed circuits |
Pinout & Package
Package: DO-213AA (hermetically sealed glass MELF case, also known as SOD-80 or LL34); lead finish: tin/lead; polarity marked by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-bias regulation configuration |
| Cathode (banded end) | Zener breakdown terminal | Connected to higher-potential node; defines regulated output reference point |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF packaging | Ensures long-term parameter stability and moisture immunity in space-grade applications |
| Metallurgical junction bonding | Improves thermal cycling reliability and reduces parameter drift over lifetime |
| Low leakage current (<0.01 µA) | Enables ultra-low-power biasing in sensor front-ends and precision analog monitors |
| Wide operating temperature range | Supports uninterrupted function across military-grade environmental profiles without external heating/cooling |
| Axial CTE match (+6 ppm/°C) | Reduces mechanical stress-induced failure during thermal cycling on PCBs with matched substrates |
Applications
| Avionics Power Reference | Satellite Voltage Monitor |
|---|---|
Use Scenario: Regulating reference voltage for ADCs and DACs in flight control computers. IC Role / Device Role / Timing Role: Zener diode providing stable 47 V reference for analog-to-digital conversion circuitry. Use Value: ±5% tolerance and low 250 Ω Zener impedance ensure <±0.5% reference error across temperature and aging. | Use Scenario: Overvoltage clamp in solar array regulator modules aboard LEO satellites. IC Role / Device Role / Timing Role: Reverse-biased Zener protecting downstream converters from transient surges. Use Value: Hermetic DO-213AA package withstands vacuum outgassing and radiation exposure without parameter shift. |
| Downhole Instrumentation | Military Radar Bias Supply |
Use Scenario: Setting bias point for high-temperature op-amps in oil/gas logging tools. IC Role / Device Role / Timing Role: Precision voltage reference maintaining calibration integrity at 175°C junction temperature. Use Value: Validated operation to +175°C eliminates need for active thermal compensation in borehole electronics. | Use Scenario: Stabilizing gate drive voltage for GaN FETs in pulsed radar transmitters. IC Role / Device Role / Timing Role: Zener shunt regulator establishing fixed 47 V rail for driver IC biasing. Use Value: Low 0.01 µA leakage prevents loading of high-impedance bias networks during standby mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4125UR-1 | Same Zener voltage (47 V), identical DO-213AA package, but MIL-PRF-19500/435 qualified with JANTXV screening | Required for defense programs mandating MIL-spec testing and traceability | Select CDLL4125 for commercial high-reliability use; choose 1N4125UR-1 when MIL-qualified documentation and lot traceability are mandatory |
| BZX85C47 | 47 V Zener, ±5% tolerance, but plastic DO-41 package with 200 °C/W thermal resistance and only -65°C to +150°C rating | Suitable for cost-sensitive industrial controls where hermeticity and extended temperature are not required | Use BZX85C47 only in non-critical, non-hermetic, lower-temperature applications - not interchangeable in aerospace or downhole designs |
Compared with 1N4125UR-1, CDLL4125 offers identical electrical specs but lacks MIL qualification documentation; versus BZX85C47, CDLL4125 provides superior thermal performance, hermetic reliability, and extended temperature capability - critical for mission-critical systems.
Availability
CDLL4125 is available at Aetrix Electronics and suitable for avionics power reference, satellite voltage monitor, and downhole instrumentation requiring stable component supply with full traceability and long-lifecycle support.
Supply support for CDLL4125 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, mixed-signal, and RF solutions for aerospace, defense, and industrial markets.
The CDLL4125 belongs to Microsemi's legacy high-stability Zener diode family designed specifically for precision voltage reference and overvoltage protection in harsh-environment electronics.
FAQ
What is the Zener voltage tolerance for CDLL4125?
The CDLL4125 has a nominal Zener voltage of 47 V with a tolerance of ±5%, measured at 25°C ambient temperature with the device junction in thermal equilibrium. This tolerance is defined per Note 1 in the official Microsemi specification sheet and applies across the full operating temperature range without additional derating.
Is CDLL4125 suitable for surface-mount assembly?
Yes, CDLL4125 is designed for surface-mount assembly in its DO-213AA (MELF/LL34) package. The leadless, hermetically sealed glass construction supports reflow soldering per standard JEDEC profiles, and its axial coefficient of expansion (+6 ppm/°C) is optimized for compatibility with common PCB substrate materials.
What is the maximum power dissipation for CDLL4125 at +125°C?
The CDLL4125 has a maximum DC power dissipation of 500 mW at an end-cap temperature (TEC) of +125°C. Above this temperature, power must be linearly derated at 10 mW/°C, reaching zero dissipation at +175°C - consistent with its rated junction temperature limit.
Does CDLL4125 have a cathode band marking?
Yes, CDLL4125 features a visible cathode band on the glass body, indicating the cathode terminal. Per Microsemi documentation, the diode must be operated with the banded (cathode) end at the higher potential to achieve proper Zener breakdown and regulation behavior.
Can CDLL4125 replace CDLL4124 in a 43 V reference design?
No - CDLL4125 is rated for 47 V nominal Zener voltage and is not a functional replacement for CDLL4124 (43 V). Substituting CDLL4125 would raise the regulated voltage by ~9%, potentially exceeding downstream component ratings and invalidating system-level calibration. Always verify Zener voltage match before interchange.
CDLL4125 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AB, MELF
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 47 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 250 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 35.8 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
CDLL4125 FAQ
1.How can I place an order for CDLL4125 through Aetrix?
Please submit a Request for Quotation (RFQ) for CDLL4125 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 CDLL4125 reliable?
The price and inventory of CDLL4125 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CDLL4125 is usually 5 days.
3.What payment methods are accepted for CDLL4125?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CDLL4125 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CDLL4125?
CDLL4125 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CDLL4125 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 CDLL4125?
For technical support, including CDLL4125 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CDLL4125 requirements.
6.How does Aetrix verify that CDLL4125 is sourced from the original manufacturer or authorized distributors?
All CDLL4125 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 CDLL4125 meets industry standards.
7.What is the process for return or replacement of CDLL4125?
All CDLL4125 units undergo pre-shipment inspection (PSI). If there is an issue with CDLL4125, 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 CDLL4125 part is unused and in its original packaging.
Return procedure for CDLL4125:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CDLL4125 Tags
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