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Microchip Technology CDLL4617
- Part No.:
- CDLL4617
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
CDLL4617.pdf
- Description:
- DIODE ZENER 2.4V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,387
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Product details
Overview
CDLL4617 from Microsemi is a hermetically sealed, glass-encapsulated MELF (DO-213AA) Zener diode with nominal 2.4 V zener voltage, 250 µA test current, 1400 Ω zener impedance, 2.0 µA max reverse leakage at 1 V, and 95 mA maximum DC zener current. It operates from –65°C to +175°C and is used for precision low-current voltage reference and regulation in high-reliability aerospace and military power supply circuits.
For engineers reviewing the CDLL4617 datasheet, CDLL4617 pinout, CDLL4617 application, or CDLL4617 equivalent, key selection criteria include its ±5% zener tolerance, 100 °C/W thermal resistance at L = 0 inch, axial COE of +6 ppm/°C for matched mounting surface design, and MIL-PRF-19500/435 qualification for JANTXV-level reliability.
Technical Context
The CDLL4617 functions as a low-power, temperature-stable voltage reference diode optimized for operation at 250 µA test current. Its 2.4 V nominal zener voltage is specified at thermal equilibrium (25°C ±3°C), with zener impedance measured using 10% 60 Hz AC superimposed on IZT.
Designed for hermetic axial MELF packaging (DO-213AA), it features metallurgically bonded construction, tin/lead lead finish, and polarity marked by cathode band. Thermal derating begins at +125°C (10 mW/°C), supporting operation up to +175°C end-cap temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 2.4 V ±5% at IZT = 250 µA - defines stable reference point under low-current bias |
| Zener Impedance (ZZT) | 1400 Ω max at IZT = 250 µA - indicates voltage regulation stability under small-signal perturbation |
| Reverse Leakage (IR) | 2.0 µA max at VR = 1 V - ensures minimal parasitic current in standby or sensing paths |
| Max DC Zener Current (IZ) | 95 mA - sets absolute upper limit for continuous conduction without degradation |
| Power Dissipation | 500 mW @ TEC = +125°C - establishes thermal boundary for PCB layout and heatsinking |
| Operating Temperature | –65°C to +175°C - enables deployment in extreme-environment avionics and downhole electronics |
Pinout & Package
Package: DO-213AA (MELF, SOD-80, LL34), hermetically sealed glass case with axial leads; cathode identified by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener breakdown reference node | Connected to lower-potential side in reverse-biased regulation configuration |
| Cathode | Zener breakdown terminal / voltage reference output | Banded end; connected to regulated voltage rail; polarity critical for correct biasing |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/435 qualified | Meets JANTXV screening requirements for aerospace/military use including burn-in, temperature cycling, and hermeticity testing |
| Hermetic glass MELF package | DO-213AA construction prevents moisture ingress and ensures long-term parameter stability in harsh environments |
| +6 ppm/°C axial COE | Enables matched thermal expansion with alumina or Kovar substrates to minimize mechanical stress during thermal cycling |
| Metallurgical bonding | Provides robust die attachment and low-resistance internal interconnects for high-reliability operation |
Applications
| Avionics Power Reference | Satellite Sensor Biasing |
|---|---|
Use Scenario: Providing stable 2.4 V reference for analog-to-digital converters in flight control computers. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to generate fixed reference voltage independent of supply variation. Use Value: ±5% tolerance and low 250 µA test current enable accurate scaling of sensor inputs without loading sensitive front-end circuitry. | Use Scenario: Biasing photodiode amplifiers in radiation-hardened star trackers. IC Role / Device Role / Timing Role: Low-leakage (2.0 µA max at 1 V) voltage clamp establishing precise reverse-bias potential. Use Value: Hermetic DO-213AA packaging and –65°C to +175°C range ensure stable operation in vacuum and thermal extremes of LEO orbit. |
| Downhole Telemetry Regulator | Military Radio RF Detector |
Use Scenario: Regulating bias voltage for pressure transducer signal conditioning in oil/gas well logging tools. IC Role / Device Role / Timing Role: Zener reference maintaining accuracy across wide temperature swings during deep-well descent. Use Value: +6 ppm/°C axial COE allows direct mounting on ceramic substrates with minimal thermal stress-induced drift. | Use Scenario: Peak detection and DC restoration in HF receiver AGC loops. IC Role / Device Role / Timing Role: Low-impedance (1400 Ω) zener element providing fast, repeatable clamping threshold. Use Value: 100 °C/W thermal resistance supports reliable operation in compact, unventilated radio chassis with limited heat sinking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4617UR-1 | Same 2.4 V nominal zener voltage and MIL-PRF-19500/435 JANTXV spec, but in axial leaded DO-35 package instead of MELF | Requires through-hole PCB assembly; less suitable for automated SMT placement than CDLL4617 | Select when legacy board compatibility or manual repair access is prioritized over surface-mount efficiency |
| CDLL4617C | Identical package and electrical specs except ±2% zener tolerance (vs. ±5% for CDLL4617) | Used where tighter voltage accuracy is required, such as precision calibration circuits | Select CDLL4617C only if system-level error budget demands sub-5% reference uncertainty |
Compared with 1N4617UR-1 and CDLL4617C, the CDLL4617 offers optimal balance of MELF SMT compatibility, JANTXV reliability, and cost-effective ±5% tolerance for general-purpose high-temperature voltage referencing-without requiring PCB redesign or premium tolerance premiums.
Availability
CDLL4617 is available at Aetrix Electronics and suitable for avionics power reference, satellite sensor biasing, downhole telemetry regulation, and military radio RF detector applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CDLL4617 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 radiation-hardened components for aerospace, defense, and industrial markets.
The CDLL4617 belongs to Microsemi's MIL-PRF-19500/435-qualified Zener diode family, engineered specifically for precision voltage reference and regulation in mission-critical systems exposed to extreme thermal, mechanical, and radiation environments.
FAQ
What is the zener voltage tolerance for CDLL4617?
The CDLL4617 has a nominal zener voltage of 2.4 V with a tolerance of ±5%, as defined in Note 1 of the specification sheet. This tolerance applies under thermal equilibrium conditions at 25°C ±3°C. Tighter tolerances are available in variants: CDLL4617C offers ±2%, and CDLL4617D offers ±1%. The CDLL4617 is not rated for tighter tolerance unless explicitly ordered with the C or D suffix.
Is CDLL4617 suitable for surface-mount assembly?
Yes, CDLL4617 is designed for surface-mount use in the DO-213AA (MELF) package, also referenced as SOD-80 or LL34. Its cylindrical glass body and metallized ends support reflow soldering per standard MELF handling guidelines. Unlike axial DO-35 devices, CDLL4617 does not require through-hole mounting or lead forming, making it compatible with automated SMT lines.
What is the maximum operating temperature for CDLL4617?
The CDLL4617 is rated for continuous operation from –65°C to +175°C, with power derating beginning at +125°C (10 mW/°C above that point). Its hermetic glass package and metallurgical bonding ensure parameter stability across this full range. At +175°C end-cap temperature, the device maintains functional integrity without exceeding its 500 mW dissipation limit at lower temperatures.
How does the thermal resistance of CDLL4617 affect PCB layout?
The CDLL4617 has a maximum thermal resistance of 100 °C/W at L = 0 inch, meaning junction-to-end-cap temperature rise is directly proportional to power dissipation. For reliable operation, PCB land patterns should maximize copper area adjacent to both terminals and avoid thermal isolation. Matching the +6 ppm/°C axial coefficient of expansion with substrate materials like alumina minimizes thermomechanical stress during cycling.
Does CDLL4617 meet any military specifications?
Yes, CDLL4617 complies with MIL-PRF-19500/435 and is available in JANTXV screening levels. It undergoes rigorous testing including hermeticity, temperature cycling, burn-in, and parametric verification per the specification. While CDLL4617 itself is the commercial-grade variant, its identical electrical and mechanical characteristics to the 1N4617UR-1 series confirm its suitability for designs requiring JANTXV-qualified performance when procured with appropriate screening.
CDLL4617 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AA
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 2.4 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 1400 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 1 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
CDLL4617 FAQ
1.How can I place an order for CDLL4617 through Aetrix?
Please submit a Request for Quotation (RFQ) for CDLL4617 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 CDLL4617 reliable?
The price and inventory of CDLL4617 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CDLL4617 is usually 5 days.
3.What payment methods are accepted for CDLL4617?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CDLL4617 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CDLL4617?
CDLL4617 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CDLL4617 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 CDLL4617?
For technical support, including CDLL4617 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CDLL4617 requirements.
6.How does Aetrix verify that CDLL4617 is sourced from the original manufacturer or authorized distributors?
All CDLL4617 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 CDLL4617 meets industry standards.
7.What is the process for return or replacement of CDLL4617?
All CDLL4617 units undergo pre-shipment inspection (PSI). If there is an issue with CDLL4617, 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 CDLL4617 part is unused and in its original packaging.
Return procedure for CDLL4617:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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