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Microchip Technology CDLL4131
- Part No.:
- CDLL4131
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF
- Datasheet:
-
CDLL4131.pdf
- Description:
- DIODE ZENER 75V 500MW DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,502
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Product details
Overview
CDLL4131 from Microsemi is a hermetically sealed, surface-mount silicon Zener diode in DO-213AA (MELF/LL34) package, rated for 75 V nominal Zener voltage at 250 µA test current, 700 Ω Zener impedance, and 5.1 mA maximum Zener current - used for precision voltage reference and overvoltage protection in aerospace-grade power regulation circuits.
For engineers reviewing the CDLL4131 datasheet, CDLL4131 pinout, CDLL4131 application, or CDLL4131 equivalent, this part supports low-current, high-stability voltage clamping in harsh-environment analog signal conditioning, DC-DC feedback loops, and MIL-PRF-19500/435-compliant avionics power monitoring systems.
Technical Context
The CDLL4131 operates as a two-terminal voltage-reference device with cathode-banded polarity, requiring reverse-bias operation. Its metallurgically bonded junction ensures stable Zener breakdown under thermal cycling between –65°C and +175°C, with thermal resistance of 100°C/W at L = 0 inch.
Designed for low-current precision use (250 µA test current), it delivers 75 V ±5% nominal Zener voltage with 700 Ω dynamic impedance at 25°C - optimized for applications where leakage current must remain below 0.01 µA at 57 V reverse bias.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 75 V ±5% at IZT = 250 µA - defines stable clamping threshold for feedback and protection circuits |
| Zener Impedance (ZZT) | 700 Ω max at 25°C - determines voltage regulation sensitivity to current variation |
| Reverse Leakage (IR) | ≤0.01 µA at VR = 57 V - enables ultra-low-power standby operation without loading reference nodes |
| Max Zener Current (IZM) | 5.1 mA - sets absolute upper limit for continuous dissipation in regulated mode |
| Power Dissipation | 500 mW @ TEC = +125°C - defines thermal envelope for PCB layout and heatsinking |
| Junction Temp Range | –65°C to +175°C - supports operation in extended-temperature military and space environments |
Pinout & Package
DO-213AA (MELF/LL34) hermetically sealed glass package with axial leads; lead finish: tin/lead; banded end denotes cathode terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node in reverse-biased configuration |
| Cathode | Reverse-bias voltage reference output | Banded end; connected to regulated node or error amplifier input in feedback paths |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic DO-213AA glass seal | Prevents moisture ingress and long-term parameter drift in humid or vacuum environments |
| MIL-PRF-19500/435 qualification | Meets screening, testing, and reliability requirements for Class S (space-level) and JANTXV-grade applications |
| Low 250 µA test current | Enables stable Zener operation in micro-power sensor interfaces and battery-backed systems |
| +6 ppm/°C axial CTE match | Reduces mechanical stress-induced failure when mounted on aluminum or Kovar substrates |
Applications
| Aerospace Power Monitoring | Avionics DC-DC Feedback |
|---|---|
Use Scenario: Real-time bus voltage supervision in flight control computers operating across –55°C to +125°C ambient. IC Role / Device Role / Timing Role: Zener reference element in comparator-based overvoltage latch circuit. Use Value: 75 V ±5% clamping threshold ensures trip margin above nominal 28 V aircraft bus while surviving thermal shock per MIL-STD-883. | Use Scenario: Precision voltage setting in isolated flyback converter feedback loop for radar transceiver power supply. IC Role / Device Role / Timing Role: Secondary-side Zener reference for optocoupler-coupled error amplifier. Use Value: 700 Ω Zener impedance minimizes load-induced error in <10 µA feedback current path. |
| Satellite Payload Biasing | Tactical Radio RF Stage Protection |
Use Scenario: Stable bias voltage generation for GaN HEMT gate drivers in L-band satellite uplink amplifiers. IC Role / Device Role / Timing Role: Low-leakage (≤0.01 µA) voltage clamp protecting gate-source junctions. Use Value: Ultra-low reverse leakage prevents gate bias shift during multi-year orbital missions. | Use Scenario: Transient overvoltage suppression on 50 Ω RF front-end input stage exposed to ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Fast-response Zener clamp shunting surge energy before LNA damage. Use Value: Hermetic glass package withstands repeated 15 kV HBM ESD events without parameter degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4135UR-1 | Same 100 V nominal Zener voltage, but higher 1500 Ω ZZT; identical DO-213AA package and MIL-PRF-19500/435 screening | Used where higher voltage tolerance (±5%) and relaxed impedance specs suffice for non-critical biasing | Select when system requires >100 V clamping and can tolerate 3× higher dynamic impedance |
| CDLL4128 | 60 V nominal Zener voltage, 400 Ω ZZT, same 250 µA IZT and DO-213AA package | Preferred for 28 V bus overvoltage protection where tighter 60 V threshold improves fault margin | Choose for legacy 28 V systems needing lower clamping voltage with better impedance than CDLL4131 |
Compared with CDLL4131, 1N4135UR-1 offers higher voltage but degraded regulation fidelity, while CDLL4128 provides tighter 60 V clamping with superior 400 Ω impedance - enabling optimized trade-offs between voltage threshold, stability, and thermal robustness in MIL-spec designs.
Availability
CDLL4131 is available at Aetrix Electronics and suitable for aerospace power monitoring, avionics DC-DC feedback, and satellite payload biasing requiring stable component supply under extended temperature and radiation-hardened conditions.
Supply support for CDLL4131 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-tolerant components for defense, aerospace, and industrial markets.
The CDLL4099–CDLL4135 series was designed specifically for MIL-PRF-19500/435-compliant Zener reference applications demanding hermetic sealing, wide temperature operation, and low-current stability.
FAQ
What is the Zener voltage tolerance for CDLL4131?
The CDLL4131 has a nominal Zener voltage of 75 V with a tolerance of ±5%, measured at 250 µA test current and 25°C ambient. This tolerance is defined per MIL-PRF-19500/435 and applies to all units without suffix; a "C" suffix would indicate ±2%, and "D" would indicate ±1% - neither applies to standard CDLL4131.
Does CDLL4131 require heatsinking in typical operation?
No, CDLL4131 does not require external heatsinking under normal conditions. With a maximum power dissipation of 500 mW at +125°C end-cap temperature and thermal resistance of 100°C/W, it remains within safe junction limits at ≤5.1 mA current and ambient temperatures up to +125°C - provided PCB copper area meets minimum thermal pad guidelines per Microsemi design notes.
Can CDLL4131 be used in place of CDLL4128?
No - CDLL4131 (75 V) and CDLL4128 (60 V) serve distinct voltage-clamping roles. Substituting CDLL4131 for CDLL4128 raises the clamping threshold by 15 V, potentially allowing damaging overvoltage in 28 V systems. Their Zener impedances also differ (700 Ω vs. 400 Ω), affecting regulation accuracy in feedback paths.
What is the reverse leakage current specification for CDLL4131 at 57 V?
CDLL4131 specifies a maximum reverse leakage current of 0.01 µA at 57 V reverse voltage and 25°C. This ultra-low leakage enables use in high-impedance reference nodes and battery-powered systems where standby current must remain below 10 nA - verified per MIL-PRF-19500/435 test condition 405.1.
Is CDLL4131 compatible with lead-free reflow soldering processes?
CDLL4131 uses tin/lead lead finish and is not qualified for lead-free reflow. Its maximum peak reflow temperature is 235°C per MIL-STD-202, Method 210, and exposure beyond 240°C risks glass-to-metal seal integrity. For RoHS-compliant designs, Microsemi recommends evaluating the 1N4135UR-1 variant or contacting Microchip for qualified lead-free alternatives.
CDLL4131 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AB, MELF
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 75 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 700 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 57 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
CDLL4131 FAQ
1.How can I place an order for CDLL4131 through Aetrix?
Please submit a Request for Quotation (RFQ) for CDLL4131 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 CDLL4131 reliable?
The price and inventory of CDLL4131 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CDLL4131 is usually 5 days.
3.What payment methods are accepted for CDLL4131?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CDLL4131 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CDLL4131?
CDLL4131 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CDLL4131 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 CDLL4131?
For technical support, including CDLL4131 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CDLL4131 requirements.
6.How does Aetrix verify that CDLL4131 is sourced from the original manufacturer or authorized distributors?
All CDLL4131 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 CDLL4131 meets industry standards.
7.What is the process for return or replacement of CDLL4131?
All CDLL4131 units undergo pre-shipment inspection (PSI). If there is an issue with CDLL4131, 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 CDLL4131 part is unused and in its original packaging.
Return procedure for CDLL4131:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CDLL4131 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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