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Microchip Technology CDLL822/TR
- Part No.:
- CDLL822/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
CDLL822/TR.pdf
- Description:
- DIODE ZENER 6.2V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,151
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Product details
Overview
CDLL822/TR from Central Semiconductor (CDI) is a temperature-compensated, hermetically sealed MELF zener diode with nominal zener voltage 5.9–6.5 V at 7.5 mA test current, 15 Ω zener impedance, ±0.01 %/°C temperature coefficient, and 500 mW power rating at +50°C - used for precision voltage reference in industrial power supplies and analog sensor conditioning circuits.
For engineers reviewing the CDLL822/TR datasheet, CDLL822/TR pinout, CDLL822/TR application, or CDLL822/TR equivalent, key selection criteria include zener voltage tolerance, temperature coefficient stability over –55°C to +100°C, low dynamic impedance at 7.5 mA, hermetic DO-213AA packaging for high-reliability environments, and compatibility with surface-mount reflow profiles.
Technical Context
The CDLL822/TR employs metallurgically bonded, double-plug construction to achieve tight voltage regulation and low thermal drift. Its zener impedance of 15 Ω is measured at 7.5 mA DC bias with 10% 60 Hz AC superimposition per JEDEC 5, ensuring predictable dynamic behavior under ripple conditions.
It operates across –65°C to +175°C storage and operating temperature ranges, with power derating at 4 mW/°C above +50°C. Reverse leakage is specified at 2 µA @ 3 VDC, supporting low-current biasing in high-impedance reference nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 5.9–6.5 V @ IZT = 7.5 mA - defines stable reference range for feedback networks |
| Zener Impedance (ZZT) | 15 Ω - ensures minimal output voltage variation under load transients |
| Temperature Coefficient | ±0.01 %/°C - enables <1 mV drift over –55°C to +100°C for precision references |
| Power Dissipation | 500 mW @ +50°C - supports continuous operation in compact PCB layouts with moderate airflow |
| Package | DO-213AA (MELF, SOD-80, LL34) - hermetic glass body for moisture resistance and long-term parameter stability |
| Reverse Leakage (IR) | 2 µA @ 3 VDC - allows use in ultra-low-power biasing without degrading source impedance |
Pinout & Package
DO-213AA (MELF) package: axial, cylindrical, leadless glass body with cathode band marking; tin/lead lead finish; polarity requires cathode (banded end) to be biased positive.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / reverse-biased zener reference node | Connected to ground or low-impedance return path when used as shunt regulator |
| Cathode | Zener breakdown terminal / voltage reference output | Banded end; connects to regulated rail or error amplifier input in feedback loop |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic DO-213AA glass package | Eliminates moisture-induced parameter shift and extends lifetime in humid or high-reliability environments |
| Double-plug metallurgical construction | Reduces thermal hysteresis and improves long-term voltage stability vs. single-junction zeners |
| Temperature-compensated design | Minimizes net TC by balancing opposing dopant gradients - critical for ±0.01 %/°C performance |
| Low 15 Ω zener impedance | Enables <10 mV line regulation error under 1 mA load step in 5 V reference designs |
Applications
| Industrial Power Supply Reference | Automotive Sensor Signal Conditioning |
|---|---|
Use Scenario: Providing stable 6.2 V reference for TL431-based adjustable SMPS feedback loops in DIN-rail power modules. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise output setpoint via optocoupler feedback network. Use Value: ±0.01 %/°C TC and 15 Ω ZZT maintain <±3 mV output drift over –40°C to +85°C ambient. | Use Scenario: Biasing bridge-based pressure transducers in engine control units requiring stable excitation voltage. IC Role / Device Role / Timing Role: Low-drift reference source for ratiometric ADC front-end scaling. Use Value: Hermetic DO-213AA packaging prevents humidity-induced offset drift in under-hood environments. |
| Medical Instrumentation Calibration | Test & Measurement Equipment |
Use Scenario: Serving as primary voltage standard in portable multimeter reference subsystems calibrated to NIST traceable standards. IC Role / Device Role / Timing Role: Precision shunt reference generating 6.2 V for DAC output buffering and ADC reference ladder. Use Value: Double-plug construction ensures <5 ppm/year long-term drift, meeting Class II calibration requirements. | Use Scenario: Stabilizing bias points in benchtop oscilloscope vertical amplifier gain stages. IC Role / Device Role / Timing Role: Low-noise, low-impedance reference node for op-amp common-mode level setting. Use Value: 2 µA reverse leakage avoids loading high-Z divider networks in 12-bit+ measurement paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CDLL822A/TR | Zener impedance reduced to 10 Ω; same VZ, TC, and package | Better dynamic regulation in fast transient loads; identical layout and thermal profile | Select CDLL822A/TR when <10 mV load regulation error is required at 1 mA step |
| CDLL823/TR | Zener impedance 48 Ω; TC improved to ±0.005 %/°C; otherwise identical VZ range and ratings | Lower TC suits wider ambient ranges; higher ZZT limits use in high-bandwidth feedback | Choose CDLL823/TR for applications prioritizing thermal stability over dynamic response |
Compared with CDLL822/TR, CDLL822A/TR delivers tighter dynamic regulation without layout change, while CDLL823/TR trades higher impedance for superior temperature coefficient - enabling optimized selection between transient fidelity and thermal drift budget.
Availability
CDLL822/TR is available at Aetrix Electronics and suitable for industrial power supplies, automotive sensor interfaces, and medical instrumentation requiring stable component supply with guaranteed long-term parametric consistency and hermetic reliability.
Supply support for CDLL822/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) is a U.S.-based manufacturer specializing in high-reliability discrete semiconductors, including zener, switching, and RF diodes, with emphasis on military, aerospace, and industrial-grade products.
The CDLL82x series is designed for precision voltage reference applications demanding hermetic sealing, low TC, and stable zener impedance - targeting systems where parameter drift directly impacts measurement accuracy or safety-critical regulation.
FAQ
What is the zener voltage tolerance of CDLL822/TR at 7.5 mA?
The CDLL822/TR has a zener voltage range of 5.9–6.5 V when tested at IZT = 7.5 mA. This ±5% tolerance reflects the manufacturing spread for this grade of temperature-compensated zener. The actual measured VZ for any given unit falls within that band, and the CDLL822/TR datasheet specifies no tighter binning - making it suitable for applications accepting ±300 mV reference uncertainty at nominal 6.2 V.
Is CDLL822/TR compatible with lead-free reflow soldering?
Yes, CDLL822/TR uses a tin/lead lead finish and is rated for standard SnPb reflow profiles. While not lead-free qualified, its DO-213AA glass package withstands peak reflow temperatures up to 260°C for ≤10 seconds. For RoHS-compliant designs, verify process compatibility with Central Semiconductor's latest reflow guidelines - CDLL822/TR itself does not contain restricted substances beyond the Pb in its termination.
Does CDLL822/TR have bidirectional conduction capability?
No - CDLL822/TR is a unidirectional zener diode intended for reverse-bias operation only. Although the data sheet notes "† Double Anode: Electrical Specifications Apply Under Both Bias Polarities" for some variants, this annotation does not apply to CDLL822/TR. Its polarity marking (cathode band) and electrical specs assume cathode-positive bias; forward conduction is not characterized or guaranteed.
What is the maximum reverse leakage current for CDLL822/TR at 3 VDC?
The CDLL822/TR exhibits a maximum reverse leakage current of 2 µA when measured at 25°C and VR = 3 VDC. This value is specified in the "REVERSE LEAKAGE CURRENT" section of the official CDI datasheet. It remains stable across the full operating temperature range and supports use in high-impedance bias networks without introducing significant error currents.
How does the power derating curve affect CDLL822/TR's usable dissipation at 100°C ambient?
At 100°C ambient, CDLL822/TR's usable power dissipation is reduced to 300 mW. This follows the published derating slope of 4 mW/°C above +50°C: (100 – 50) × 4 = 200 mW reduction from the base 500 mW rating. Engineers must ensure the worst-case power in circuit - including ripple-induced RMS heating - stays below 300 mW at 100°C to avoid exceeding absolute maximum ratings and compromising long-term reliability of the CDLL822/TR.
CDLL822/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):
- 15 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
CDLL822/TR FAQ
1.How can I place an order for CDLL822/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for CDLL822/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 CDLL822/TR reliable?
The price and inventory of CDLL822/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CDLL822/TR is usually 5 days.
3.What payment methods are accepted for CDLL822/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CDLL822/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CDLL822/TR?
CDLL822/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CDLL822/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 CDLL822/TR?
For technical support, including CDLL822/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CDLL822/TR requirements.
6.How does Aetrix verify that CDLL822/TR is sourced from the original manufacturer or authorized distributors?
All CDLL822/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 CDLL822/TR meets industry standards.
7.What is the process for return or replacement of CDLL822/TR?
All CDLL822/TR units undergo pre-shipment inspection (PSI). If there is an issue with CDLL822/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 CDLL822/TR part is unused and in its original packaging.
Return procedure for CDLL822/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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