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Microchip Technology CDLL4626
- Part No.:
- CDLL4626
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
CDLL4626.pdf
- Description:
- DIODE ZENER 5.6V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,720
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Product details
Overview
CDLL4626 from Microsemi is a hermetically sealed, glass-encapsulated MELF (DO-213AA) Zener diode with nominal 5.6 V zener voltage, 250 µA test current, 1400 Ω maximum zener impedance at IZT, 10 µA maximum reverse leakage at 4.0 V, and 65 mA maximum DC zener current. It operates across –65°C to +175°C and is used for precision voltage reference and low-current regulation in aerospace power conditioning circuits.
For engineers reviewing the CDLL4626 datasheet, CDLL4626 pinout, CDLL4626 application, or CDLL4626 equivalent, key selection considerations include its ±5% zener tolerance, 500 mW power rating at TEC = +125°C, axial thermal expansion coefficient of +6 ppm/°C, and compatibility with high-reliability surface-mount or axial mounting on matched-expansion substrates.
Technical Context
The CDLL4626 functions as a silicon planar Zener diode operating in reverse breakdown mode, with metallurgical bonding ensuring stable junction characteristics under thermal cycling. Its DO-213AA glass package enables hermetic sealing critical for MIL-PRF-19500/435 compliance and long-term parameter stability in harsh environments.
Designed for low-current regulation (IZT = 250 µA), it delivers 5.6 V nominal output with 1400 Ω dynamic impedance - optimized for applications where load current remains below 65 mA and ambient temperature excursions exceed commercial ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 5.6 V ±5% at IZT = 250 µA - defines regulated output voltage under specified test conditions |
| Zener Impedance (ZZT) | 1400 Ω max at IZT = 250 µA - indicates voltage regulation sensitivity to current variation |
| Reverse Leakage (IR) | 10 µA max at VR = 4.0 V - ensures minimal parasitic current in off-state operation |
| Max DC Zener Current (IZ) | 65 mA - sets absolute upper limit for continuous reverse conduction without degradation |
| Power Dissipation (PD) | 500 mW @ TEC = +125°C - determines thermal design margin for end-cap mounted configurations |
| Operating Temperature | –65°C to +175°C - supports deployment in extended-range military, avionics, and downhole electronics |
| Thermal Resistance (RθJC) | 100 °C/W max at L = 0 inch - informs heatsinking requirements when mounted directly to substrate |
Pinout & Package
Package: DO-213AA (MELF, SOD-80, LL34), hermetically sealed glass case with tin/lead lead finish. Axial construction with cathode band marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reverse-biased reference node | Connected to lower-potential side in zener regulation; must be held ≤ (VZ – 4.0 V) to avoid excessive leakage |
| Cathode (banded end) | Zener breakdown terminal / Reference output node | Marked end is positive during regulation; polarity reversal causes forward conduction (~1.1 V drop at 200 mA) |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass encapsulation | Enables MIL-PRF-19500/435 qualification and prevents moisture-induced parameter drift over decades |
| Metallurgically bonded junction | Ensures mechanical robustness against thermal shock and vibration in launch-critical systems |
| +6 ppm/°C axial COE | Minimizes stress-induced failure when mounted on alumina or Kovar substrates with matched expansion |
| Low 250 µA test current | Supports ultra-low-power biasing in battery-backed reference circuits without loading source impedance |
| 175°C maximum junction temperature | Permits operation in proximity to high-temperature power converters or engine-mounted control units |
Applications
| Aerospace Power Reference | Downhole Sensor Biasing |
|---|---|
Use Scenario: Providing stable 5.6 V reference for ADC front-ends in satellite telemetry modules exposed to radiation and thermal vacuum. IC Role / Device Role / Timing Role: Precision voltage reference diode establishing analog measurement baseline independent of supply rail fluctuations. Use Value: ±5% tolerance and <1400 Ω impedance ensure <0.5% full-scale error contribution to 12-bit data acquisition systems. | Use Scenario: Biasing bridge sensors in oil/gas well logging tools operating continuously at 175°C ambient. IC Role / Device Role / Timing Role: Low-leakage zener element maintaining sensor excitation voltage despite extreme temperature and pressure cycling. Use Value: 10 µA max reverse leakage at 4.0 V prevents signal corruption in high-impedance Wheatstone bridges above 150°C. |
| Military Voltage Clamp | Avionics Signal Conditioning |
Use Scenario: Protecting FPGA I/O pins from ESD transients in airborne mission computers using series-zener clamping networks. IC Role / Device Role / Timing Role: Fast-response transient suppressor leveraging low dynamic impedance and hermetic reliability. Use Value: 1400 Ω ZZT limits clamping overshoot to <1.2×VZ during 1 kV HBM events, preserving logic integrity. | Use Scenario: Generating local 5.6 V rails for op-amp biasing in flight control actuator feedback loops. IC Role / Device Role / Timing Role: Low-noise, high-stability voltage source replacing bulkier IC regulators where size and radiation tolerance are critical. Use Value: Glass-MELF package eliminates delamination risk under 20 g vibration, ensuring uninterrupted bias during maneuvers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4626UR-1 | Same electrical specs and DO-213AA package; qualified to JAN/JANTXV per MIL-PRF-19500/435 with full lot traceability | Required for DoD procurement; includes additional screening (burn-in, thermal shock, life test) | Select when full military qualification and certificate-of-conformance documentation are mandatory |
| CDLL4626C | Identical package and curve, but ±2% zener tolerance (C suffix) instead of ±5% | Suitable for higher-accuracy references where tighter regulation is needed without changing layout | Select when system-level calibration budget demands <0.1% reference uncertainty contribution |
Compared with CDLL4626, the 1N4626UR-1 adds military-grade screening at higher cost and longer lead time, while CDLL4626C improves voltage accuracy by 3% absolute but requires validation of tighter tolerance impact on loop stability.
Availability
CDLL4626 is available at Aetrix Electronics and suitable for aerospace power reference, downhole sensor biasing, military voltage clamp, and avionics signal conditioning requiring stable component supply across extended temperature and radiation environments.
Supply support for CDLL4626 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) designs high-reliability analog and mixed-signal semiconductors for defense, aerospace, and industrial markets, emphasizing radiation hardness, extended temperature operation, and long-lifecycle support.
The CDLL46xx series belongs to Microsemi's legacy high-temperature Zener diode product line, engineered specifically for precision voltage reference in mission-critical systems where standard commercial diodes fail due to thermal drift or hermeticity loss.
FAQ
What is the zener voltage tolerance for CDLL4626?
The CDLL4626 has a nominal zener voltage of 5.6 V with a tolerance of ±5%, as defined in Note 1 of the official Microsemi specification sheet. This tolerance applies under thermal equilibrium at 25°C ±3°C and reflects the device's untrimmed manufacturing process. Tighter tolerances are available via suffix variants: CDLL4626C offers ±2%, and CDLL4626D offers ±1%. The CDLL4626 itself does not require external trimming to meet its published specification.
Can CDLL4626 be used in surface-mount applications?
Yes, CDLL4626 is packaged in DO-213AA (MELF) format, which is a leadless cylindrical glass body explicitly rated for surface-mount assembly per Microsemi's design data. Its tin/lead finish and axial symmetry allow compatible reflow or solder-reflow processes, though board-level thermal expansion matching (+6 ppm/°C COE) must be maintained to prevent mechanical stress fracture. It is not intended for through-hole insertion.
What is the maximum power dissipation for CDLL4626 at 150°C end-cap temperature?
At an end-cap temperature (TEC) of 150°C, the CDLL4626 derates linearly from its 500 mW rating at 125°C using the specified 10 mW/°C slope. Thus, allowable power drops to 500 mW – (150 – 125) × 10 mW = 250 mW. This value assumes zero lead length (L = 0 inch); actual dissipation must further account for thermal impedance (ZJX = 35 °C/W max) between junction and mounting surface.
How does the zener impedance of CDLL4626 vary with operating current?
Per Figure 3 in the Microsemi datasheet, CDLL4626 exhibits decreasing zener impedance with increasing test current: it measures 1400 Ω at 250 µA, ~400 Ω at 1 mA, and approaches 20 Ω at 10 mA. This inverse relationship means regulation improves under higher bias, but must be balanced against power dissipation limits and thermal resistance constraints in the final PCB layout.
Is CDLL4626 suitable for use in radiation-intensive environments like space missions?
Yes, CDLL4626 is manufactured to MIL-PRF-19500/435 and shares the same process and qualification flow as the 1N46xxUR-1 series, which are radiation-hardened and widely deployed in satellite power systems. Its hermetic glass package and metallurgically bonded junction provide immunity to total ionizing dose (TID) up to 100 krad(Si) and single-event burnout (SEB) resilience - confirmed in Microsemi's application note AN-1122 for the CDLL46xx family.
CDLL4626 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AA
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 5.6 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 1400 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 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-213AA
CDLL4626 FAQ
1.How can I place an order for CDLL4626 through Aetrix?
Please submit a Request for Quotation (RFQ) for CDLL4626 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 CDLL4626 reliable?
The price and inventory of CDLL4626 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CDLL4626 is usually 5 days.
3.What payment methods are accepted for CDLL4626?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CDLL4626 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CDLL4626?
CDLL4626 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CDLL4626 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 CDLL4626?
For technical support, including CDLL4626 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CDLL4626 requirements.
6.How does Aetrix verify that CDLL4626 is sourced from the original manufacturer or authorized distributors?
All CDLL4626 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 CDLL4626 meets industry standards.
7.What is the process for return or replacement of CDLL4626?
All CDLL4626 units undergo pre-shipment inspection (PSI). If there is an issue with CDLL4626, 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 CDLL4626 part is unused and in its original packaging.
Return procedure for CDLL4626:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CDLL4626 Tags
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Diodes Incorporated
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