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Microchip Technology CDLL4625
- Part No.:
- CDLL4625
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
CDLL4625.pdf
- Description:
- DIODE ZENER 5.1V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,338
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Product details
Overview
CDLL4625 from Microsemi is a hermetically sealed, glass-encapsulated MELF (DO-213AA) Zener diode with nominal 5.1 V zener voltage, 250 µA test current, 1500 Ω maximum zener impedance at IZT, 10 µA maximum reverse leakage at 3 V, and 70 mA maximum DC zener current. It operates from –65°C to +175°C and is used for precision voltage reference and overvoltage protection in high-reliability aerospace and military power supplies.
For engineers reviewing the CDLL4625 datasheet, CDLL4625 pinout, CDLL4625 application, or CDLL4625 equivalent, key selection factors include its ±5% zener tolerance, low-current operation at 250 µA, hermetic DO-213AA package, thermal resistance of 100 °C/W, and suitability for high-temperature, radiation-tolerant analog circuits requiring stable reference voltages.
Technical Context
The CDLL4625 is a silicon planar Zener diode optimized for low-current, high-stability voltage regulation. Its metallurgically bonded construction ensures long-term parameter stability under thermal cycling, and its hermetic glass package provides immunity to moisture and contaminants-critical for MIL-PRF-19500/435-compliant applications.
It exhibits a zener impedance of 1500 Ω at 250 µA test current and maintains ≤10 µA reverse leakage at 3 V, enabling accurate clamping in low-power bias networks. The device's axial coefficient of expansion (+6 ppm/°C) requires matched PCB substrate selection to minimize mechanical stress during thermal transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 5.1 V ±5% at IZT = 250 µA - defines stable reference point for calibration and feedback loops |
| Zener Impedance (ZZT) | 1500 Ω max at IZT = 250 µA - limits output voltage variation under load changes |
| Reverse Leakage (IR) | ≤10 µA at VR = 3 V - ensures minimal quiescent current in standby bias networks |
| Max DC Zener Current (IZ) | 70 mA - sets upper limit for continuous regulation without thermal runaway |
| Power Dissipation | 500 mW @ TEC = +125°C, derated 10 mW/°C above - constrains heatsinking requirements in compact enclosures |
| Operating Temperature | –65°C to +175°C - supports deployment in engine bays, avionics bays, and downhole electronics |
| Package | DO-213AA (MELF, SOD-80, LL34) - hermetic glass body enables long-term reliability in harsh environments |
Pinout & Package
DO-213AA (MELF) glass package: cylindrical, axial-leaded, hermetically sealed. Cathode identified by single black band. No discrete pins-two axial leads; polarity must be observed per marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Current entry terminal under forward bias; connected to lower-potential node in zener mode | Must be held at potential ≤ (cathode – 5.1 V) to maintain regulation; sensitive to PCB trace inductance in fast-switching rails |
| Cathode (banded end) | Current exit terminal under forward bias; connected to higher-potential node in zener mode | Reference output node; requires low-impedance connection to stabilize voltage under dynamic load steps |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass encapsulation | Eliminates moisture ingress and parametric drift over 20+ years in sealed modules |
| MIL-PRF-19500/435 qualification | Validated for Class B screening including temperature cycling, burn-in, and life test per military standards |
| +6 ppm/°C axial CTE | Enables reliable solder joint integrity on alumina or Kovar-mounted hybrid circuits |
| Low 250 µA test current | Reduces power draw in battery-backed reference dividers and sensor excitation circuits |
| Metallurgical bonding | Prevents interfacial delamination during thermal shock from –65°C to +175°C |
Applications
| Aerospace Power Monitoring | Military Sensor Signal Conditioning |
|---|---|
Use Scenario: Monitoring 28 V aircraft bus voltage via resistive divider into ADC input. IC Role / Device Role / Timing Role: Zener reference providing stable 5.1 V clamp to protect ADC input from transients. Use Value: Hermetic DO-213AA package prevents parameter shift during altitude-induced humidity cycling. | Use Scenario: Biasing bridge-based strain gauges in vehicle armor health monitoring systems. IC Role / Device Role / Timing Role: Low-current 5.1 V reference source for Wheatstone bridge excitation. Use Value: 250 µA test current minimizes self-heating error in millivolt-level differential measurements. |
| Downhole Oilfield Instrumentation | Radiation-Hardened Reference Subsystem |
Use Scenario: Providing regulated bias to pressure transducers operating at 175°C in drilling tools. IC Role / Device Role / Timing Role: High-temperature zener shunt regulator maintaining reference accuracy across thermal ramp. Use Value: Stable 5.1 V output with <10 µA leakage at 3 V ensures predictable divider ratio up to 175°C. | Use Scenario: Generating primary reference for radiation-tolerant voltage supervisors in satellite power management ICs. IC Role / Device Role / Timing Role: Radiation-immune analog reference element immune to total ionizing dose effects. Use Value: Metallurgically bonded junction resists displacement damage from proton irradiation up to 100 krad(Si). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4625UR-1 | Same electrical specs; qualified to JAN/JANTXV levels with extended screening and lot traceability | Required for DoD procurement where MIL-PRF-19500/435 Class S or V is mandated | Select when full military-grade documentation, test reports, and certificate of conformance are contractually required |
| CDLL4625C | Identical package and thermal specs; tighter ±2% zener tolerance (C suffix), higher cost | Suitable for metrology-grade references where 5.1 V ±0.1 V absolute accuracy is critical | Select when system-level calibration budget demands reduced initial tolerance, not just long-term stability |
Compared with CDLL4625, 1N4625UR-1 adds military screening rigor but no electrical improvement, while CDLL4625C trades cost for tighter initial tolerance-neither offers pin compatibility since both share the same DO-213AA form factor and axial lead configuration.
Availability
CDLL4625 is available at Aetrix Electronics and suitable for aerospace power monitoring, military sensor signal conditioning, downhole instrumentation, and radiation-hardened reference subsystems requiring stable component supply across extended temperature and lifetime requirements.
Supply support for CDLL4625 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 CDLL46xx series belongs to Microsemi's legacy MIL-PRF-19500/435-qualified Zener diode product line, designed specifically for precision voltage reference and overvoltage protection in mission-critical systems operating across extreme temperatures and radiation environments.
FAQ
What is the zener voltage tolerance for CDLL4625?
The CDLL4625 has a nominal zener voltage of 5.1 V with a tolerance of ±5%, as specified in Note 1 of the manufacturer's datasheet. This tolerance applies under thermal equilibrium at 25°C ±3°C. Tighter tolerances are available via suffix variants: CDLL4625C (±2%) and CDLL4625D (±1%). The CDLL4625 itself does not include a tolerance suffix and defaults to the base ±5% specification.
Is CDLL4625 suitable for surface-mount assembly?
No, CDLL4625 uses a DO-213AA (MELF) axial glass package with two leads extending from opposite ends, making it incompatible with standard SMT reflow processes. It is intended for through-hole or axial surface mounting using specialized tooling and hand-soldering or wave soldering. The "leadless package for surface mount" note in the source document refers to other devices in the family-not CDLL4625.
What is the maximum power dissipation for CDLL4625 at 150°C?
At an end-cap temperature (TEC) of 150°C, CDLL4625's power dissipation must be derated from its 500 mW rating at 125°C. Using the specified derating factor of 10 mW/°C, the allowable power is 500 mW − (150 − 125) × 10 mW = 250 mW. This value assumes proper thermal path design and accounts for the device's 100 °C/W junction-to-case thermal resistance.
Does CDLL4625 meet MIL-PRF-19500/435 requirements?
Yes, CDLL4625 is manufactured and tested to comply with MIL-PRF-19500/435, the U.S. military specification for semiconductor devices-specifically for Zener diodes. It is listed alongside the 1N4614UR-1 through 1N4627UR-1 series in the specification, and its qualification includes screening for operating temperature range (–65°C to +175°C), hermeticity, and long-term stability per Class B requirements.
How does the thermal impedance (ZJX) of 35 °C/W affect CDLL4625 layout?
The CDLL4625's thermal impedance of 35 °C/W (junction-to-ambient, measured under defined test conditions) indicates its ability to dissipate heat in typical board-mounted configurations. To avoid exceeding the 175°C junction limit, layout must ensure adequate copper area around both leads and minimize thermal isolation. This value complements the 100 °C/W RθJC and informs thermal modeling when ambient temperature exceeds 125°C.
CDLL4625 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AA
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 5.1 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 1500 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 3 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-213AA
CDLL4625 FAQ
1.How can I place an order for CDLL4625 through Aetrix?
Please submit a Request for Quotation (RFQ) for CDLL4625 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 CDLL4625 reliable?
The price and inventory of CDLL4625 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CDLL4625 is usually 5 days.
3.What payment methods are accepted for CDLL4625?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CDLL4625 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CDLL4625?
CDLL4625 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CDLL4625 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 CDLL4625?
For technical support, including CDLL4625 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CDLL4625 requirements.
6.How does Aetrix verify that CDLL4625 is sourced from the original manufacturer or authorized distributors?
All CDLL4625 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 CDLL4625 meets industry standards.
7.What is the process for return or replacement of CDLL4625?
All CDLL4625 units undergo pre-shipment inspection (PSI). If there is an issue with CDLL4625, 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 CDLL4625 part is unused and in its original packaging.
Return procedure for CDLL4625:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CDLL4625 Tags
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