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Microchip Technology CDLL4127
- Part No.:
- CDLL4127
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF
- Datasheet:
-
CDLL4127.pdf
- Description:
- DIODE ZENER 56V 500MW DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,933
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Product details
Overview
CDLL4127 from Microsemi is a hermetically sealed, surface-mount silicon Zener diode in DO-213AA (MELF/LL34) package, rated for 56 V nominal Zener voltage at 250 µA test current, 300 Ω maximum Zener impedance, and 6.7 mA maximum Zener current, used for precision voltage regulation in aerospace and industrial power supply reference circuits.
For engineers reviewing the CDLL4127 datasheet, CDLL4127 pinout, CDLL4127 application, or CDLL4127 equivalent, key selection criteria include ±5% Zener tolerance, 100 °C/W thermal resistance at zero lead length, -65°C to +175°C junction temperature range, low-leakage operation (<0.01 µA at 42.6 V), and MIL-PRF-19500/435 qualification for high-reliability environments.
Technical Context
The CDLL4127 operates as a two-terminal voltage reference device with metallurgically bonded construction and axial coefficient of expansion matched to ceramic substrates. Its Zener impedance is measured using 25 µA AC superimposed on 250 µA DC test current per Note 2, ensuring stable regulation under low-current bias conditions.
Designed for hermetic glass encapsulation in DO-213AA case, it supports operation up to +175°C junction temperature with 500 mW power dissipation at +125°C end-cap temperature and linear derating beyond that point. Polarity is defined by cathode band marking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 56 V ±5% at 250 µA - defines regulated output voltage with tight tolerance for reference stability |
| Zener Impedance (ZZT) | 300 Ω max at 250 µA - limits voltage variation under load changes in feedback networks |
| Reverse Leakage (IR) | <0.01 µA at 42.6 V - ensures minimal error current in high-impedance reference paths |
| Max Zener Current (IZM) | 6.7 mA - sets upper limit for safe continuous conduction without thermal runaway |
| Junction Temp Range | -65°C to +175°C - enables deployment in extreme-environment avionics and downhole electronics |
| Power Dissipation | 500 mW @ TEC = +125°C - determines heatsinking requirements in compact layouts |
| Thermal Resistance | 100 °C/W max at L = 0 inch - informs thermal design margin when mounted directly to PCB |
Pinout & Package
Package: DO-213AA (MELF/LL34), hermetically sealed glass case with tin/lead lead finish. Axial COE ≈ +6 ppm/°C; polarity marked by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward bias | Connected to lower-potential node in reverse-biased Zener configuration |
| Cathode (banded end) | Current exit terminal during forward bias; Zener breakdown terminal | Connected to regulated voltage node; must be held at higher potential than anode for regulation |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/435 qualified | Meets military reliability, screening, and environmental stress standards for flight-critical systems |
| Hermetic glass seal | Prevents moisture ingress and long-term parameter drift in humid or corrosive atmospheres |
| Low-current regulation | Stable 56 V reference at only 250 µA - enables ultra-low-power biasing in battery-backed circuits |
| High-temperature operation | Full specification compliance up to +175°C junction - suitable for engine-mounted control units |
| Metallurgical bonding | Ensures mechanical robustness and thermal cycle reliability in vibration-prone aerospace platforms |
Applications
| Aerospace Power Reference | Industrial Sensor Excitation |
|---|---|
Use Scenario: Voltage reference in triple-redundant flight control system power monitors. IC Role / Device Role / Timing Role: Zener diode providing stable 56 V reference for ADC input scaling and comparator thresholds. Use Value: ±5% tolerance and <0.01 µA leakage ensure measurement accuracy over -55°C to +125°C operating range. | Use Scenario: Excitation source for high-precision strain gauge bridges in oilfield pressure transducers. IC Role / Device Role / Timing Role: Precision shunt regulator establishing fixed excitation voltage across bridge arms. Use Value: 300 Ω Zener impedance minimizes voltage shift under bridge current variations up to 6.7 mA. |
| Downhole Telemetry Bias | Avionics Thermal Compensation |
Use Scenario: Bias network component in high-temperature telemetry modems deployed at 175°C wellbore environments. IC Role / Device Role / Timing Role: Temperature-stable voltage clamp protecting downstream CMOS interface circuitry. Use Value: Guaranteed operation to +175°C junction temperature with no parameter degradation or parametric shift. | Use Scenario: Reference element in thermally compensated oscillator circuits for inertial navigation systems. IC Role / Device Role / Timing Role: Low-drift Zener setting baseline voltage for temperature-sensing compensation networks. Use Value: Metallurgically bonded construction and matched COE reduce thermal stress-induced hysteresis errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4127UR-1 | Same electrical specs and MIL-PRF-19500/435 qualification; axial leaded DO-204AH (DO-41) package instead of DO-213AA | Requires through-hole mounting and larger board area; not suitable for high-density SMT layouts | Select CDLL4127 for space-constrained surface-mount designs; choose 1N4127UR-1 where axial leads simplify prototyping or legacy board reuse |
| BZX85C56 | Commercial-grade, ±5% tolerance, 56 V Zener, but only rated to +150°C and not MIL-qualified; TO-204AA (DO-41) package | Lacks hermetic seal and high-temp reliability; unsuitable for aerospace or extended-life industrial deployments | Use BZX85C56 only in cost-sensitive, non-critical commercial applications where full MIL spec is unnecessary |
Compared with 1N4127UR-1 and BZX85C56, the CDLL4127 uniquely combines surface-mount MELF packaging, hermetic reliability, and +175°C operation - making it the sole option for miniaturized, high-reliability Zener references in mission-critical systems.
Availability
CDLL4127 is available at Aetrix Electronics and suitable for aerospace power monitoring, downhole sensor excitation, avionics thermal compensation, and high-temperature industrial control requiring stable component supply across extended product lifecycles.
Supply support for CDLL4127 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 defense, aerospace, and industrial markets.
The CDLL4127 belongs to Microsemi's MIL-PRF-19500/435-qualified Zener diode family, engineered specifically for precision voltage reference applications in harsh-environment electronics where long-term stability and failure resilience are mandatory.
FAQ
What is the Zener voltage tolerance for CDLL4127?
The CDLL4127 has a nominal Zener voltage of 56 V with a tolerance of ±5%, as specified in Note 1 of the official Microsemi datasheet. This tolerance applies when measured at 25°C ambient with the device in thermal equilibrium. No "C" (±2%) or "D" (±1%) suffix is present in the CDLL4127 part number, confirming the standard ±5% grade.
Is CDLL4127 suitable for surface-mount assembly?
Yes, CDLL4127 is explicitly designed for surface-mount use in the DO-213AA (MELF/LL34) package. Its leadless, cylindrical glass body and tin/lead finish support reflow soldering processes. The datasheet states "LEADLESS PACKAGE FOR SURFACE MOUNT" and provides dimensional data aligned with JEDEC DO-213AA standards.
What is the maximum junction temperature rating for CDLL4127?
The CDLL4127 is rated for a junction and storage temperature range of -65°C to +175°C, as stated in the Maximum Ratings table. This rating is validated under MIL-PRF-19500/435 screening and confirmed across all electrical parameters in the Electrical Characteristics table, enabling use in extreme thermal environments such as turbine-mounted controls.
Does CDLL4127 require a heatsink in typical operation?
No external heatsink is required for CDLL4127 under typical low-current operation (e.g., 250 µA test condition). Its 100 °C/W thermal resistance at zero lead length and 500 mW power rating at +125°C end-cap temperature allow direct PCB mounting. Heatsinking becomes relevant only near IZM (6.7 mA) at elevated ambient temperatures.
How does CDLL4127 differ from commercial Zener diodes like BZX85C56?
CDLL4127 differs from BZX85C56 in three critical ways: it is MIL-PRF-19500/435 qualified, hermetically sealed in glass, and rated to +175°C junction temperature. BZX85C56 is commercial-grade, plastic-packaged, and limited to +150°C - making CDLL4127 the only choice for long-life, high-reliability applications where parameter stability and environmental resilience are non-negotiable.
CDLL4127 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AB, MELF
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 56 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 300 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 42.6 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
CDLL4127 FAQ
1.How can I place an order for CDLL4127 through Aetrix?
Please submit a Request for Quotation (RFQ) for CDLL4127 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 CDLL4127 reliable?
The price and inventory of CDLL4127 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CDLL4127 is usually 5 days.
3.What payment methods are accepted for CDLL4127?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CDLL4127 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CDLL4127?
CDLL4127 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CDLL4127 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 CDLL4127?
For technical support, including CDLL4127 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CDLL4127 requirements.
6.How does Aetrix verify that CDLL4127 is sourced from the original manufacturer or authorized distributors?
All CDLL4127 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 CDLL4127 meets industry standards.
7.What is the process for return or replacement of CDLL4127?
All CDLL4127 units undergo pre-shipment inspection (PSI). If there is an issue with CDLL4127, 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 CDLL4127 part is unused and in its original packaging.
Return procedure for CDLL4127:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CDLL4127 Tags
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