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Microchip Technology CDLL4126
- Part No.:
- CDLL4126
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF
- Datasheet:
-
CDLL4126.pdf
- Description:
- DIODE ZENER 51V 500MW DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,805
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Product details
Overview
CDLL4126 from Microsemi is a hermetically sealed, surface-mount silicon Zener diode in DO-213AA (MELF/LL34) package, rated for 51 V nominal Zener voltage at 250 µA test current, 300 Ω maximum Zener impedance, and 7.5 mA maximum Zener current, used for precision voltage regulation in aerospace and industrial power supply reference circuits.
For engineers reviewing the CDLL4126 datasheet, CDLL4126 pinout, CDLL4126 application, or CDLL4126 equivalent, this page provides verified electrical parameters, thermal derating behavior, junction temperature limits, reverse leakage at rated voltage, and direct alternative options for high-reliability Zener reference design.
Technical Context
The CDLL4126 operates as a two-terminal voltage reference device with cathode-banded polarity, requiring operation with the banded end positive. Its metallurgically bonded construction ensures stable long-term Zener voltage performance under thermal cycling.
It is characterized at 25°C ambient with 250 µA test current and exhibits +5% Zener voltage tolerance (±2.55 V), 0.01 µA maximum reverse leakage at 38.76 V, and 100 °C/W maximum junction-to-case thermal resistance at zero lead length.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 51 V ±5% at IZT = 250 µA - defines stable regulation point for reference design |
| Zener Impedance (ZZT) | 300 Ω max at IZT = 250 µA - indicates voltage stability under small-signal current variation |
| Reverse Leakage (IR) | 0.01 µA max at VR = 38.76 V - ensures minimal error current in high-impedance bias networks |
| Max Zener Current (IZM) | 7.5 mA - sets upper limit for safe continuous power dissipation at TEC ≤ 125°C |
| Junction Temp Range | –65°C to +175°C - supports operation in extended-temperature avionics and downhole electronics |
| Power Dissipation | 500 mW @ TEC = +125°C, derated 10 mW/°C above - defines thermal envelope for PCB layout |
Pinout & Package
Package: DO-213AA (MELF/LL34), hermetically sealed glass case, axial leadless surface-mount configuration with tin/lead termination. Polarity marked by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to lower-potential node in Zener regulator or clamp circuit |
| Cathode (banded end) | Current exit terminal during reverse breakdown | Connected to regulated output or reference node; must be held at higher potential than anode |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass sealing | Enables operation in high-humidity, corrosive, or vacuum environments without parameter drift |
| +5% Zener voltage tolerance | Meets MIL-PRF-19500/435 Class B requirements for military-grade voltage references |
| Metallurgical bonding | Provides low thermal resistance interface between die and case for stable long-term VZ |
| Low 250 µA test current | Allows use in ultra-low-power biasing and sensing circuits where current budget is constrained |
Applications
| Aerospace Power Reference | Industrial Sensor Excitation |
|---|---|
Use Scenario: Precision voltage reference in satellite DC-DC converter feedback loops operating across –55°C to +125°C. IC Role / Device Role / Timing Role: Zener diode providing stable 51 V reference for error amplifier input. Use Value: Hermetic DO-213AA package and ±5% VZ tolerance ensure regulation stability over mission lifetime without recalibration. | Use Scenario: Excitation source for high-accuracy 4–20 mA current-loop pressure transmitters in oilfield equipment. IC Role / Device Role / Timing Role: Two-terminal shunt reference establishing precise bias voltage for op-amp current source. Use Value: 0.01 µA reverse leakage at 38.76 V minimizes error contribution in microamp-level sensor signal paths. |
| Military Voltage Clamp | Downhole Electronics Regulation |
Use Scenario: Overvoltage protection clamp on 48 V vehicle power bus in armored ground vehicles. IC Role / Device Role / Timing Role: Transient voltage suppressor limiting surge-induced spikes to ≤51 V. Use Value: 175°C max junction temperature enables reliable clamping during sustained high-temperature engine bay operation. | Use Scenario: Reference element in high-temperature logging tools deployed at 150°C wellbore environments. IC Role / Device Role / Timing Role: Primary voltage reference for ADC and DAC calibration subsystems. Use Value: Metallurgically bonded structure and –65°C to +175°C rating prevent parametric shift under thermal shock and mechanical stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4126UR-1 | Same Zener voltage (51 V), identical DO-213AA package, but qualified to JAN/JANTX levels per MIL-PRF-19500/435 | Required for programs mandating MIL-spec screening (e.g., defense prime contracts) | Select 1N4126UR-1 when full military screening and traceability are contractually required |
| BZX84-C51LT1G | 51 V Zener, SOT-23 package, ±5% tolerance, but plastic encapsulation and 150°C max junction temp | Suitable for commercial/industrial designs where hermeticity and >150°C operation are not needed | Select BZX84-C51LT1G for cost-sensitive, non-hermetic, lower-temperature applications |
Compared with CDLL4126, 1N4126UR-1 offers identical electrical specs with enhanced reliability screening, while BZX84-C51LT1G trades hermeticity and temperature range for smaller size and lower cost-making CDLL4126 optimal for high-reliability, high-temperature analog reference nodes.
Availability
CDLL4126 is available at Aetrix Electronics and suitable for aerospace power reference, industrial sensor excitation, military voltage clamp, and downhole electronics regulation requiring stable component supply across extended temperature and radiation-tolerant environments.
Supply support for CDLL4126 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 CDLL4126 belongs to Microsemi's legacy high-stability Zener diode family designed for precision voltage reference and regulation in mission-critical systems where hermeticity, wide temperature range, and long-term parameter stability are essential.
FAQ
What is the Zener voltage tolerance for CDLL4126?
The CDLL4126 has a nominal Zener voltage of 51 V with a tolerance of ±5%, meaning the actual measured voltage falls between 48.45 V and 53.55 V when tested at 250 µA and 25°C ambient. This tolerance complies with MIL-PRF-19500/435 Class B requirements and is confirmed in the manufacturer's published specification table for CDLL4126.
Is CDLL4126 suitable for surface-mount assembly?
Yes, CDLL4126 is packaged in DO-213AA (MELF/LL34), a leadless cylindrical surface-mount package with tin/lead termination. It is explicitly designated for surface-mount applications in the datasheet and features axial coefficient of expansion matching recommendations for reliable reflow soldering on standard FR-4 and ceramic substrates.
What is the maximum reverse leakage current for CDLL4126?
The maximum reverse leakage current for CDLL4126 is 0.01 µA at a reverse voltage of 38.76 V, as specified in the Electrical Characteristics table. This value is measured at 25°C and reflects the device's ability to maintain high impedance in off-state bias networks, critical for precision analog reference designs.
Does CDLL4126 require heatsinking in typical applications?
No, CDLL4126 does not require external heatsinking in typical applications because its 500 mW power dissipation rating at +125°C end-cap temperature and 100 °C/W junction-to-case thermal resistance allow adequate self-cooling when operated below 7.5 mA at moderate ambient temperatures. Layout should still observe minimum pad clearance per MIL-STD-202.
Can CDLL4126 be used in place of CDLL4125 or CDLL4127?
CDLL4126 is not a drop-in replacement for CDLL4125 (47 V) or CDLL4127 (56 V), as each part has a distinct nominal Zener voltage and corresponding regulation point. Substitution requires circuit-level verification of voltage margin, power dissipation, and load regulation-no pin-compatible or functional interchangeability is claimed or supported by the datasheet.
CDLL4126 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AB, MELF
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 51 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 300 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 38.8 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
CDLL4126 FAQ
1.How can I place an order for CDLL4126 through Aetrix?
Please submit a Request for Quotation (RFQ) for CDLL4126 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 CDLL4126 reliable?
The price and inventory of CDLL4126 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CDLL4126 is usually 5 days.
3.What payment methods are accepted for CDLL4126?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CDLL4126 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CDLL4126?
CDLL4126 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CDLL4126 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 CDLL4126?
For technical support, including CDLL4126 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CDLL4126 requirements.
6.How does Aetrix verify that CDLL4126 is sourced from the original manufacturer or authorized distributors?
All CDLL4126 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 CDLL4126 meets industry standards.
7.What is the process for return or replacement of CDLL4126?
All CDLL4126 units undergo pre-shipment inspection (PSI). If there is an issue with CDLL4126, 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 CDLL4126 part is unused and in its original packaging.
Return procedure for CDLL4126:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CDLL4126 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
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SMAZ12-13-F
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