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Microchip Technology CDLL829A/TR
- Part No.:
- CDLL829A/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
CDLL829A/TR.pdf
- Description:
- DIODE ZENER 6.2V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,206
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Product details
Overview
CDLL829A/TR from Central Semiconductor (CDI) is a temperature-compensated, hermetically sealed MELF-packaged Zener diode with nominal zener voltage 5.9–6.5 V, 10 Ω zener impedance at 7.5 mA test current, and ultra-low temperature coefficient of ±0.0005 %/°C over –55°C to +100°C. It delivers precision voltage reference in high-reliability analog power supply feedback loops.
For engineers reviewing the CDLL829A/TR datasheet, CDLL829A/TR pinout, CDLL829A/TR application, or CDLL829A/TR equivalent, key selection criteria include its 10 Ω dynamic impedance, ±0.0005 %/°C tempco, DO-213AA glass MELF package, 500 mW power rating at +50°C, and operation across –65°C to +175°C ambient.
Technical Context
This Zener diode uses metallurgically bonded double-plug construction for stable breakdown characteristics and low noise. Its temperature compensation is achieved via matched junction design, enabling minimal voltage drift across industrial and military temperature ranges.
The device operates in reverse-biased mode with cathode band positive, exhibits 2 µA max reverse leakage at 3 V, and maintains specified zener voltage tolerance and impedance under both polarities when used in double-anode configurations (though CDLL829A is single-anode per part numbering and datasheet grouping).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 5.9–6.5 V @ IZT = 7.5 mA - defines tight regulation window for precision reference use |
| Zener Impedance (ZZT) | 5 Ω @ IZT = 7.5 mA - ensures minimal AC ripple transmission in feedback paths |
| Tempco (αVZ) | ±0.0005 %/°C - enables <±0.3 mV drift over full –55°C to +100°C range |
| Power Dissipation | 500 mW @ +50°C, derated 4 mW/°C above - supports continuous operation in compact thermal environments |
| Operating Temp | –65°C to +175°C - qualified for aerospace, downhole, and extended-temperature industrial systems |
| Reverse Leakage | ≤2 µA @ VR = 3 V, 25°C - guarantees low standby current in high-impedance bias networks |
Pinout & Package
Package: DO-213AA (MELF, SOD-80, LL34), hermetically sealed glass case, axial leaded, tin/lead finish. Cathode identified by band; operated with banded end positive.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current sink in reverse bias | Connected to lower-potential node (e.g., ground or feedback divider low-side) |
| Cathode | Regulated voltage output node | Banded end; connected to reference point requiring stable 5.9–6.5 V potential |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low tempco | ±0.0005 %/°C enables sub-millivolt stability across wide temperature excursions |
| Low zener impedance | 5 Ω minimizes load-induced voltage variation in active feedback circuits |
| Hermetic MELF package | DO-213AA glass construction ensures long-term parameter stability and moisture immunity |
| High-temperature rating | –65°C to +175°C operation supports deployment in engine control, avionics, and oilfield electronics |
Applications
| Switch-Mode Power Supply Feedback | High-Precision Instrumentation Reference |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or forward converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Primary voltage reference establishing error amplifier setpoint; replaces TL431 where higher temp stability is required. Use Value: 5 Ω impedance and ±0.0005 %/°C tempco reduce output voltage drift to <±1.5 mV over –40°C to +85°C ambient. | Use Scenario: Providing stable excitation voltage for 24-bit delta-sigma ADC reference buffers in portable test equipment. IC Role / Device Role / Timing Role: Low-noise, low-drift shunt reference replacing discrete resistor-Zener networks in ratiometric sensor signal chains. Use Value: Sub-µA leakage and 5 Ω impedance prevent loading errors and maintain INL spec under varying supply conditions. |
| Aerospace Voltage Monitor | Downhole Sensor Conditioning |
Use Scenario: Monitoring regulated bus voltage in satellite power distribution units with radiation-tolerant analog monitoring circuitry. IC Role / Device Role / Timing Role: Standby reference for comparator-based overvoltage/undervoltage detection; operates continuously at +125°C. Use Value: Hermetic DO-213AA package and –65°C to +175°C rating ensure no parametric shift after thermal cycling or vacuum exposure. | Use Scenario: Biasing piezoresistive pressure transducers in oil/gas well logging tools exposed to 150°C+ ambient and high vibration. IC Role / Device Role / Timing Role: Stable excitation source for Wheatstone bridge; mounted directly on ceramic substrate with matched COE. Use Value: Axial CTE of +6 ppm/°C matches alumina substrates, eliminating thermally induced mechanical stress and long-term calibration drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N829UR-1 | MIL-PRF-19500/159 qualified (JAN/JANTXV), same VZ, ZZT, and tempco; hermetic metal-glass package | Required for defense/aerospace programs mandating MIL-spec screening and traceability | Select 1N829UR-1 when compliance with MIL-STD-883 testing and lot traceability is mandatory |
| BZX84-C6V2 | 6.2 V nominal, ±5% tolerance, 60 Ω ZZT, –65°C to +150°C, SOT-23 plastic package | Suitable for cost-sensitive commercial power supplies where ±10 mV drift is acceptable | Choose BZX84-C6V2 only for non-critical consumer-grade applications with relaxed stability requirements |
Compared with CDLL829A/TR, 1N829UR-1 offers identical electrical performance with enhanced reliability assurance for mission-critical systems, while BZX84-C6V2 trades precision and ruggedness for low cost and surface-mount compatibility in less demanding environments.
Availability
CDLL829A/TR is available at Aetrix Electronics and suitable for high-reliability power supply feedback, precision instrumentation reference, aerospace voltage monitoring, and downhole sensor conditioning requiring stable component supply across extended temperature and long-life deployments.
Supply support for CDLL829A/TR 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
Central Semiconductor Corp. (CDI) designs and manufactures high-reliability discrete semiconductors, including Zener, Schottky, and switching diodes, with emphasis on military, aerospace, and industrial applications.
The CDLL821–CDLL829A series targets precision voltage reference needs in harsh-environment analog systems, leveraging hermetic MELF packaging and temperature-compensated junction design for long-term stability.
FAQ
What is the nominal zener voltage range of CDLL829A/TR?
The CDLL829A/TR has a nominal zener voltage range of 5.9 V to 6.5 V at a test current of 7.5 mA. This range reflects the guaranteed minimum and maximum breakdown voltage under standard test conditions and is tighter than many general-purpose Zeners, supporting high-accuracy regulation tasks where CDLL829A/TR serves as the primary reference element.
Is CDLL829A/TR compatible with surface-mount assembly processes?
Yes, CDLL829A/TR uses the DO-213AA (MELF) package, which is a leadless cylindrical surface-mount format standardized as SOD-80 and LL34. Its glass body and tin/lead terminations support reflow soldering per J-STD-020, and the axial coefficient of expansion (+6 ppm/°C) is designed to match common ceramic and metal-core PCB substrates used in high-reliability SMT layouts.
How does the temperature coefficient of CDLL829A/TR compare to standard Zener diodes?
CDLL829A/TR achieves a temperature coefficient of ±0.0005 %/°C - over 10× tighter than typical 5.6 V Zeners (±0.005 %/°C) and 100× better than 3.3 V Zeners. This ultra-low tempco is realized through proprietary double-plug junction compensation and enables CDLL829A/TR to maintain voltage stability within ±0.3 mV across –55°C to +100°C, critical for CDLL829A/TR's use in metrology-grade references.
What is the maximum power dissipation rating for CDLL829A/TR?
CDLL829A/TR is rated for 500 mW DC power dissipation at an ambient temperature of +50°C, with linear derating of 4 mW/°C above that point. At +125°C ambient, its usable power drops to 200 mW. This rating applies to free-air conditions and assumes proper PCB thermal relief; the hermetic glass package limits internal thermal resistance, making CDLL829A/TR suitable for compact, convection-cooled designs.
Can CDLL829A/TR be used in place of CDLL829 without modification?
Yes, CDLL829A/TR is a direct replacement for CDLL829, sharing identical voltage range (5.9–6.5 V), temperature coefficient (±0.0005 %/°C), and package (DO-213AA). The "A" suffix denotes reduced zener impedance (5 Ω vs. 15 Ω for CDLL829) and lower test current (7.5 mA vs. same, but tighter ZZT spec), meaning CDLL829A/TR delivers improved regulation accuracy without layout or schematic changes - a true drop-in upgrade for existing CDLL829 designs.
CDLL829A/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 6.2 V
- Tolerance:
- ±4.83%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 10 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 3 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -65°C ~ 175°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-213AA
CDLL829A/TR FAQ
1.How can I place an order for CDLL829A/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for CDLL829A/TR 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 CDLL829A/TR reliable?
The price and inventory of CDLL829A/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CDLL829A/TR is usually 5 days.
3.What payment methods are accepted for CDLL829A/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CDLL829A/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CDLL829A/TR?
CDLL829A/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CDLL829A/TR 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 CDLL829A/TR?
For technical support, including CDLL829A/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CDLL829A/TR requirements.
6.How does Aetrix verify that CDLL829A/TR is sourced from the original manufacturer or authorized distributors?
All CDLL829A/TR 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 CDLL829A/TR meets industry standards.
7.What is the process for return or replacement of CDLL829A/TR?
All CDLL829A/TR units undergo pre-shipment inspection (PSI). If there is an issue with CDLL829A/TR, 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 CDLL829A/TR part is unused and in its original packaging.
Return procedure for CDLL829A/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CDLL829A/TR Tags
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