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Microchip Technology CDLL4134
- Part No.:
- CDLL4134
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF
- Datasheet:
-
CDLL4134.pdf
- Description:
- DIODE ZENER 91V 500MW DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,038
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Product details
Overview
CDLL4134 from Microsemi is a hermetically sealed, surface-mount silicon Zener diode in DO-213AA (MELF/LL34) package, rated for 91 V nominal Zener voltage at 250 µA test current, 1200 Ω Zener impedance, and 4.2 mA maximum Zener current, used for precision voltage reference and overvoltage protection in aerospace-grade power regulation circuits.
For engineers reviewing the CDLL4134 datasheet, CDLL4134 pinout, CDLL4134 application, or CDLL4134 equivalent, key selection factors include its ±5% Zener tolerance, -65°C to +175°C junction temperature range, 500 mW power dissipation at 125°C, low-leakage performance (≤0.01 µA at 69.16 V), and MIL-PRF-19500/435 qualification for high-reliability analog signal conditioning.
Technical Context
The CDLL4134 operates as a two-terminal voltage reference device with metallurgically bonded construction and axial coefficient of thermal expansion matched to ceramic substrates. Its Zener impedance is measured using 25 µA RMS AC superimposed on 250 µA DC bias, per Note 2 in the specification table.
Designed for stable operation under extreme thermal cycling, it features 100 °C/W junction-to-case thermal resistance at zero lead length and requires mounting on surfaces with ~6 ppm/°C COE to minimize mechanical stress-induced parameter drift during temperature excursions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 91 V ±5% at 250 µA - defines precise clamping threshold for overvoltage protection circuits |
| Zener Impedance (ZZT) | 1200 Ω max - indicates voltage regulation stability under varying load conditions |
| Reverse Leakage Current | ≤0.01 µA at 69.16 V - ensures minimal standby power loss in high-impedance bias networks |
| Max Zener Current (IZM) | 4.2 mA - sets upper limit for continuous power dissipation without degradation |
| Junction Temp Range | -65°C to +175°C - enables deployment in avionics, downhole, and space-qualified systems |
| Power Dissipation | 500 mW @ TEC = +125°C - supports operation in conduction-cooled environments with derating above 125°C |
Pinout & Package
Package: DO-213AA (MELF/LL34), hermetically sealed glass case, tin/lead lead finish, axial symmetry, cathode band marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; grounded reference node in reverse-biased Zener mode | Connected to system ground or low-impedance return path to maintain stable reference potential |
| Cathode | Current exit terminal in forward bias; high-voltage input node in Zener regulation | Marked with band; connects to protected rail or voltage source requiring clamping at 91 V |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/435 qualified | Meets military reliability standards for screening, testing, and lot traceability in critical systems |
| Hermetic glass seal | Prevents moisture ingress and long-term parameter drift in humid or corrosive environments |
| Metallurgical bonding | Ensures robust interfacial integrity between silicon die and package leads under thermal shock |
| Low-current operation | Stable Zener behavior at 250 µA enables use in ultra-low-power reference designs |
Applications
| Aerospace Power Bus Protection | Satellite Payload Voltage Reference |
|---|---|
Use Scenario: Protecting 100 V primary bus against transients in launch vehicle power distribution units. IC Role / Device Role / Timing Role: Two-terminal shunt regulator clamping voltage spikes above 91 V to safeguard downstream converters. Use Value: Leverages ±5% tolerance and 1200 Ω ZZT to hold bus within safe operating margin without crowbar triggering. | Use Scenario: Providing stable bias for radiation-hardened op-amps in LEO satellite telemetry front-ends. IC Role / Device Role / Timing Role: Precision voltage reference establishing gain-setting node for analog sensor signal chains. Use Value: Maintains regulation across -65°C to +175°C with <0.01 µA leakage, minimizing offset drift in unheated compartments. |
| Downhole Oilfield Instrumentation | Military Radar Bias Supply |
Use Scenario: Regulating bias voltage for piezoelectric sensor amplifiers in geothermal drill-string sensors. IC Role / Device Role / Timing Role: Zener reference stabilizing amplifier quiescent point under extreme thermal cycling (−55°C to +200°C ambient). Use Value: Hermetic DO-213AA package prevents parameter shift due to H2S exposure and thermal stress fatigue. | Use Scenario: Clamping gate drive rails in GaN-based RF power amplifier modules operating at 90 V DC supply. IC Role / Device Role / Timing Role: Fast-response overvoltage clamp preventing gate oxide breakdown during RF switching transients. Use Value: Low 250 µA test current enables integration into high-impedance bias networks without loading error. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4134UR-1 | Same Zener voltage (91 V), identical DO-213AA package, but MIL-PRF-19500/435 JANTXV grade with tighter screening | Required for programs mandating JANTXV-level qualification and extended lot traceability | Select when full military screening documentation and burn-in data are contractually required |
| BZX84-C91 | 91 V Zener, SOT-23 package, ±5% tolerance, but only rated to +150°C junction and not hermetically sealed | Suitable for commercial/industrial PCBs where cost and board space outweigh extreme environment needs | Choose for non-military designs needing compact footprint and lower unit cost, accepting reduced temp range and reliability |
Compared with CDLL4134, 1N4134UR-1 offers enhanced process control and screening for mission-critical use, while BZX84-C91 trades hermeticity and temperature capability for volume manufacturability and SMT compatibility.
Availability
CDLL4134 is available at Aetrix Electronics and suitable for aerospace power regulation, satellite payload referencing, downhole instrumentation, and military radar bias supply requiring stable component supply across extended temperature and lifetime requirements.
Supply support for CDLL4134 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 CDLL4134 belongs to Microsemi's legacy MIL-qualified Zener diode family designed specifically for precision voltage reference and transient suppression in harsh-environment electronic systems where long-term parametric stability is mandatory.
FAQ
What is the Zener voltage tolerance for CDLL4134?
The CDLL4134 has a nominal Zener voltage of 91 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 CDLL4134 part number, confirming the standard ±5% grade.
Is CDLL4134 suitable for surface-mount assembly?
Yes, CDLL4134 is explicitly designed for surface-mount use in the DO-213AA (MELF/LL34) package, as stated in the header text: "LEADLESS PACKAGE FOR SURFACE MOUNT". Its cylindrical glass body and metallized end caps are compatible with standard reflow profiles for high-reliability SMT processes.
What is the maximum reverse leakage current for CDLL4134?
The maximum reverse leakage current for CDLL4134 is 0.01 µA at a reverse voltage of 69.16 V, per the Electrical Characteristics table. This ultra-low leakage supports high-impedance reference networks and minimizes standby power loss in battery-critical or thermally isolated systems.
Does CDLL4134 meet any military specifications?
Yes, CDLL4134 complies with MIL-PRF-19500/435, as confirmed by the document header stating "1N4099UR-1 THRU 1N4135UR-1 AVAILABLE IN JAN, JANTX, JANTXV AND JANS PER MIL-PRF-19500/435" and listing CDLL4134 in the same qualified family. It is rated for operation from −65°C to +175°C and undergoes rigorous screening per this specification.
What is the thermal resistance of CDLL4134?
The junction-to-case thermal resistance (RθJC) of CDLL4134 is 100 °C/W maximum at L = 0 inch lead length, as specified in the DESIGN DATA section. This value is critical for calculating junction temperature rise under power dissipation and must be applied with appropriate derating above +125°C ambient.
CDLL4134 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AB, MELF
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 91 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 1200 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 69.2 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
CDLL4134 FAQ
1.How can I place an order for CDLL4134 through Aetrix?
Please submit a Request for Quotation (RFQ) for CDLL4134 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 CDLL4134 reliable?
The price and inventory of CDLL4134 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CDLL4134 is usually 5 days.
3.What payment methods are accepted for CDLL4134?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CDLL4134 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CDLL4134?
CDLL4134 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CDLL4134 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 CDLL4134?
For technical support, including CDLL4134 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CDLL4134 requirements.
6.How does Aetrix verify that CDLL4134 is sourced from the original manufacturer or authorized distributors?
All CDLL4134 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 CDLL4134 meets industry standards.
7.What is the process for return or replacement of CDLL4134?
All CDLL4134 units undergo pre-shipment inspection (PSI). If there is an issue with CDLL4134, 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 CDLL4134 part is unused and in its original packaging.
Return procedure for CDLL4134:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CDLL4134 Tags
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MMBZ5240B-7-F
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