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Microchip Technology CDLL4124
- Part No.:
- CDLL4124
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF
- Datasheet:
-
CDLL4124.pdf
- Description:
- DIODE ZENER 43V 500MW DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,022
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Product details
Overview
CDLL4124 from Microsemi is a hermetically sealed, surface-mount silicon Zener diode in DO-213AA (MELF/LL34) package, rated for 43 V nominal Zener voltage at 250 µA test current, 250 Ω maximum Zener impedance, and 8.9 mA maximum Zener current - used for precision voltage reference and overvoltage protection in aerospace power conditioning circuits.
For engineers reviewing the CDLL4124 datasheet, CDLL4124 pinout, CDLL4124 application, or CDLL4124 equivalent, key selection criteria include its ±5% Zener tolerance, low leakage (<0.01 µA at 32.65 V), 175°C max junction temperature, and compatibility with high-reliability MIL-PRF-19500/435 screening levels.
Technical Context
The CDLL4124 operates as a two-terminal voltage-regulating device relying on controlled reverse-biased avalanche breakdown. Its Zener voltage is specified at 25°C ambient with thermal equilibrium, and its impedance is measured using 25 µA RMS 60 Hz AC superimposed on 250 µA DC bias - confirming stable regulation under low-current, high-stability conditions.
Designed for hermetic glass encapsulation and metallurgical bonding, the CDLL4124 exhibits a +6 ppm/°C axial coefficient of expansion, requiring matched COE mounting surfaces to prevent mechanical stress-induced parameter drift during thermal cycling in avionics and space-grade systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 43 V ±5% at 250 µA - defines precise clamping threshold for reference or protection circuits |
| Zener Impedance (ZZT) | 250 Ω max at 250 µA - ensures minimal voltage shift under load variation |
| Reverse Leakage (IR) | <0.01 µA at 32.65 V - enables ultra-low standby current in battery-backed systems |
| Max Zener Current (IZM) | 8.9 mA - sets safe continuous dissipation limit at 500 mW derated above +125°C |
| Junction Temp Range | –65°C to +175°C - supports operation in extreme environments without parameter degradation |
| Package | DO-213AA (MELF/LL34) - provides hermetic sealing and high reliability for space/aerospace use |
Pinout & Package
DO-213AA (MELF/LL34) hermetically sealed glass package with axial leads; cathode identified by band. No discrete pins - two-terminal device with axial polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; reference node in reverse bias | Connected to lower-potential side of regulated circuit; determines polarity of clamping action |
| Cathode (banded end) | Current exit terminal in forward bias; Zener breakdown terminal in reverse bias | Connected to higher-potential side; defines 43 V reference point relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass seal | Prevents moisture ingress and long-term parameter drift in harsh environments |
| MIL-PRF-19500/435 qualified | Meets military screening requirements including temperature cycling, burn-in, and life test |
| Metallurgically bonded junction | Enhances thermal stability and resistance to mechanical shock/vibration |
| +6 ppm/°C axial COE | Enables reliable solder joint integrity when mounted on matched-expansion substrates |
Applications
| Aerospace Power Bus Protection | Satellite Voltage Reference |
|---|---|
Use Scenario: Clamping transient spikes on 28 V primary bus in launch vehicle power distribution units. IC Role / Device Role / Timing Role: Two-terminal Zener clamp protecting downstream regulators and FPGAs from >60 V surges. Use Value: Maintains 43 V clamping threshold across –65°C to +175°C, ensuring consistent protection without derating. | Use Scenario: Providing stable 43 V reference for ADC calibration in radiation-hardened telemetry subsystems. IC Role / Device Role / Timing Role: Precision Zener reference source with <0.01 µA leakage enabling low-power, high-accuracy analog front-ends. Use Value: ±5% tolerance and 250 Ω impedance support sub-0.1% reference stability over mission lifetime. |
| Avionics Sensor Excitation | High-Reliability Backup Regulator |
Use Scenario: Biasing bridge sensors in flight control surface position transducers operating at elevated ambient temperatures. IC Role / Device Role / Timing Role: Low-current Zener shunt regulator supplying excitation voltage to strain-gauge bridges. Use Value: Stable 43 V output at 250 µA enables accurate ratiometric measurement independent of supply fluctuations. | Use Scenario: Standby voltage reference in triple-redundant inertial navigation system power modules. IC Role / Device Role / Timing Role: Fail-safe Zener element maintaining critical bias points during main regulator fault events. Use Value: Hermetic DO-213AA package and MIL-qualified screening ensure >100,000-hour field reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4124UR-1 | Same Zener voltage (43 V), identical DO-213AA package, but screened to JANTXV level per MIL-PRF-19500/435 | Higher screening grade suitable for mission-critical flight hardware where extended environmental testing is mandated | Select 1N4124UR-1 when full JANTXV qualification documentation and lot traceability are contractually required |
| CDLL4123 | 39 V nominal Zener voltage, otherwise identical electrical specs and packaging | Used where 39 V clamping/reference is system-specified instead of 43 V; not interchangeable without circuit revalidation | Choose CDLL4123 only if system-level voltage margin analysis confirms 39 V meets functional safety thresholds |
Compared with CDLL4124, the 1N4124UR-1 offers higher reliability assurance via JANTXV screening but same electrical behavior, while CDLL4123 provides a lower-voltage alternative requiring design-level validation due to 4 V Zener offset.
Availability
CDLL4124 is available at Aetrix Electronics and suitable for aerospace power conditioning, satellite telemetry calibration, and avionics sensor excitation requiring stable component supply with full MIL-PRF-19500/435 compliance documentation.
Supply support for CDLL4124 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 and mixed-signal components for defense, aerospace, and industrial markets.
The CDLL4124 belongs to Microsemi's legacy MIL-qualified Zener diode family, designed specifically for precision voltage regulation and transient suppression in mission-critical systems where hermeticity and extended temperature operation are mandatory.
FAQ
What is the Zener voltage tolerance for CDLL4124?
The CDLL4124 has a nominal Zener voltage of 43 V with a tolerance of ±5%, measured at 25°C ambient with the device junction in thermal equilibrium. This tolerance is defined per MIL-PRF-19500/435 and applies to all standard CDLL4124 units without suffix; a "C" suffix would indicate ±2%, and "D" would indicate ±1%.
Is CDLL4124 suitable for surface-mount assembly?
Yes, CDLL4124 is packaged in DO-213AA (MELF/LL34), a leadless, cylindrical, surface-mount-optimized glass case. It is explicitly designated for surface-mount applications in the datasheet and features tin/lead lead finish compatible with standard reflow profiles for high-reliability assemblies.
What is the maximum power dissipation for CDLL4124 at +125°C?
The CDLL4124 has a DC power dissipation rating of 500 mW at TEC = +125°C. Above this temperature, power must be linearly derated at 10 mW/°C, reaching zero dissipation at +175°C - consistent with its specified junction temperature range of –65°C to +175°C.
Does CDLL4124 require heatsinking in typical applications?
No, CDLL4124 does not require external heatsinking in standard applications. Its thermal resistance (RθJC) is 100°C/W at L = 0 inch, and with a maximum Zener current of 8.9 mA at 43 V, worst-case power dissipation remains below 380 mW - well within its 500 mW rating at +125°C ambient.
How is polarity marked on CDLL4124?
The CDLL4124 uses a cathode band - a visible dark ring near one end of the DO-213AA glass body - to identify the cathode terminal. The diode must be operated with the banded (cathode) end at higher potential relative to the anode to achieve Zener breakdown and voltage regulation.
CDLL4124 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AB, MELF
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 43 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 250 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 32.7 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
CDLL4124 FAQ
1.How can I place an order for CDLL4124 through Aetrix?
Please submit a Request for Quotation (RFQ) for CDLL4124 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 CDLL4124 reliable?
The price and inventory of CDLL4124 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CDLL4124 is usually 5 days.
3.What payment methods are accepted for CDLL4124?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CDLL4124 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CDLL4124?
CDLL4124 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CDLL4124 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 CDLL4124?
For technical support, including CDLL4124 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CDLL4124 requirements.
6.How does Aetrix verify that CDLL4124 is sourced from the original manufacturer or authorized distributors?
All CDLL4124 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 CDLL4124 meets industry standards.
7.What is the process for return or replacement of CDLL4124?
All CDLL4124 units undergo pre-shipment inspection (PSI). If there is an issue with CDLL4124, 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 CDLL4124 part is unused and in its original packaging.
Return procedure for CDLL4124:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CDLL4124 Tags
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