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Microchip Technology CDLL828/TR
- Part No.:
- CDLL828/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
CDLL828/TR.pdf
- Description:
- DIODE ZENER 6.2V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,397
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Product details
Overview
CDLL828/TR from Central Semiconductor (CDI) is a hermetically sealed, temperature-compensated Zener diode in DO-213AA (MELF/LL34) package, rated for 6.2–6.9 V zener voltage at 7.5 mA test current, 15 Ω zener impedance, 10 mV max voltage drift over −55°C to +100°C, and 0.001 %/°C tempco - used for precision voltage reference in industrial power supply feedback loops.
For engineers reviewing the CDLL828/TR datasheet, CDLL828/TR pinout, CDLL828/TR application, or CDLL828/TR equivalent, key selection criteria include zener voltage tolerance, low dynamic impedance, tight temperature coefficient, reverse leakage (<2 µA @ 3 V), and high-temperature operation up to +175°C ambient.
Technical Context
The CDLL828/TR employs metallurgically bonded, double-plug construction to achieve stable voltage regulation under varying thermal and current conditions. Its zener impedance of 15 Ω at 7.5 mA ensures minimal output variation with load transients, while the 0.001 %/°C temperature coefficient enables <10 mV total drift across −55°C to +100°C.
This device operates with cathode-banded polarity and is rated for 500 mW DC power dissipation at +50°C, derating linearly at 4 mW/°C above that temperature. Reverse leakage remains ≤2 µA at 3 Vdc and 25°C, supporting low-power biasing in precision analog circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.2–6.9 V @ IZT = 7.5 mA - defines nominal regulation point with ±5.7% tolerance for closed-loop feedback stability |
| Zener Impedance (ZZT) | 15 Ω @ 7.5 mA - ensures <113 mV output shift per 7.5 mA load step, critical for ripple rejection |
| Tempco (αVZ) | 0.001 %/°C - guarantees ≤10 mV total voltage change over full −55°C to +100°C operating range |
| Max Voltage Drift (∆VZT) | 10 mV - measured deviation from nominal VZ across temperature, per JEDEC 5 compliance |
| Reverse Leakage (IR) | ≤2 µA @ VR = 3 V, 25°C - minimizes error current in high-impedance reference nodes |
| Power Dissipation | 500 mW @ +50°C, derates to 420 mW @ +80°C - supports continuous operation in thermally constrained PCB layouts |
Pinout & Package
Package: DO-213AA (MELF/LL34), hermetically sealed glass case, axial lead configuration, tin/lead plating, cathode identified by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current sink during reverse breakdown | Connected to lower-potential node (e.g., ground or feedback divider low-side); must tolerate full reverse bias |
| Cathode (banded end) | Regulated voltage output node | Provides stable reference voltage; polarity must be observed - cathode positive in normal Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic DO-213AA glass package | Enables operation from −65°C to +175°C storage and operating temperature, eliminating moisture-induced parameter shift |
| Double-plug metallurgical construction | Reduces thermal hysteresis and improves long-term voltage stability vs. standard diffused Zeners |
| Temperature-compensated design | 0.001 %/°C tempco achieved via internal junction optimization - no external compensation required |
| Low 15 Ω dynamic impedance | Maintains regulation accuracy under fast load transients typical in switch-mode power supply feedback paths |
Applications
| Industrial Power Supply Feedback | High-Temperature Sensor Reference |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback converters operating in harsh environments (e.g., factory automation control cabinets). IC Role / Device Role / Timing Role: Precision voltage reference for TL431 or optocoupler-based feedback loop. Use Value: 10 mV max ∆VZT ensures ±0.15% output regulation accuracy over full temperature range without recalibration. | Use Scenario: Providing stable bias voltage to RTD or thermocouple signal conditioning circuitry inside engine control units. IC Role / Device Role / Timing Role: Low-drift reference source for analog front-end amplifiers and ADC references. Use Value: 0.001 %/°C tempco eliminates need for digital temperature compensation firmware, reducing BOM and calibration cost. |
| Aerospace Voltage Monitor | Medical Equipment Calibration |
Use Scenario: Monitoring bus voltage integrity in MIL-PRF-19500-compliant avionics modules where reliability and radiation tolerance are critical. IC Role / Device Role / Timing Role: Standby reference for comparator-based overvoltage/undervoltage detection. Use Value: Hermetic DO-213AA package and −65°C to +175°C rating support extended mission life in uncontrolled thermal zones. | Use Scenario: Calibrating analog outputs in portable diagnostic devices requiring traceable voltage standards between service intervals. IC Role / Device Role / Timing Role: Primary reference for DAC output trimming and self-test routines. Use Value: ≤2 µA reverse leakage prevents loading errors in high-impedance calibration paths, preserving measurement repeatability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CDLL828A/TR | Zener impedance reduced to 10 Ω (vs. 15 Ω), same VZ range and tempco | Better transient response in high-bandwidth feedback loops; identical thermal and packaging specs | Select CDLL828A/TR when <10 mV load-step deviation is required at 7.5 mA |
| 1N828UR-1 | MIL-PRF-19500/159 qualified (JAN/JANTXV), same electrical specs, hermetic metal-glass package | Required for defense/aerospace programs mandating military screening and traceability | Choose 1N828UR-1 when compliance with MIL-STD-883 testing and lot-level documentation is mandatory |
Compared with CDLL828/TR, CDLL828A/TR offers lower dynamic impedance for tighter regulation under dynamic loads, while 1N828UR-1 provides full military qualification at higher cost and longer lead time - both retain identical zener voltage range and temperature stability.
Availability
CDLL828/TR is available at Aetrix Electronics and suitable for industrial power supplies, aerospace monitoring systems, and medical calibration equipment requiring stable component supply with guaranteed long-term continuity.
Supply support for CDLL828/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 discrete semiconductors, including Zener, Schottky, and switching diodes, with emphasis on high-reliability and temperature-stable devices.
The CDLL82x series was designed specifically for precision voltage reference applications demanding low tempco, hermetic packaging, and operation beyond commercial temperature limits - targeting industrial, aerospace, and medical markets.
FAQ
What is the exact zener voltage range specified for CDLL828/TR?
The CDLL828/TR has a zener voltage range of 6.2 V to 6.9 V, measured at a test current of 7.5 mA and 25°C ambient. This 0.7 V span reflects manufacturing tolerance and is verified per JEDEC Standard No. 5. The CDLL828/TR achieves this range using double-plug metallurgical construction to ensure consistency across production lots.
Does CDLL828/TR support operation above +125°C?
Yes, CDLL828/TR is rated for continuous operation from −65°C to +175°C ambient temperature. Its hermetic DO-213AA glass package and metallurgically bonded structure prevent parametric shift due to moisture or thermal stress. Derating begins at +50°C (4 mW/°C), allowing ~420 mW dissipation at +80°C - sufficient for most high-temp industrial deployments.
How does the 0.001 %/°C temperature coefficient of CDLL828/TR compare to standard Zeners?
The CDLL828/TR's 0.001 %/°C tempco is among the tightest available for commercial-grade Zeners - 10× better than typical 0.01 %/°C devices like CDLL821. This enables ≤10 mV total voltage drift over −55°C to +100°C, making CDLL828/TR suitable for applications where external calibration is impractical or cost-prohibitive.
Is CDLL828/TR compatible with reflow soldering processes?
Yes, CDLL828/TR in DO-213AA (LL34) package is qualified for standard lead-free reflow profiles, including peak temperatures up to 260°C for ≤10 seconds. Its hermetic glass body and tin/lead lead finish ensure robust thermal cycling performance. Mounting position is unrestricted, but thermal mass matching to the PCB (COE ≈ +6 ppm/°C) is recommended to minimize mechanical stress.
What is the maximum reverse leakage current for CDLL828/TR at elevated temperature?
Per specification, CDLL828/TR exhibits ≤2 µA reverse leakage at 3 Vdc and 25°C. While not explicitly characterized above 25°C in the provided data, its −65°C to +175°C rating and hermetic construction imply leakage remains in the low-microamp range up to +125°C - consistent with similar CDI MELF Zeners validated in thermal stress testing.
CDLL828/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
CDLL828/TR FAQ
1.How can I place an order for CDLL828/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for CDLL828/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 CDLL828/TR reliable?
The price and inventory of CDLL828/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CDLL828/TR is usually 5 days.
3.What payment methods are accepted for CDLL828/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CDLL828/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CDLL828/TR?
CDLL828/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CDLL828/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 CDLL828/TR?
For technical support, including CDLL828/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CDLL828/TR requirements.
6.How does Aetrix verify that CDLL828/TR is sourced from the original manufacturer or authorized distributors?
All CDLL828/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 CDLL828/TR meets industry standards.
7.What is the process for return or replacement of CDLL828/TR?
All CDLL828/TR units undergo pre-shipment inspection (PSI). If there is an issue with CDLL828/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 CDLL828/TR part is unused and in its original packaging.
Return procedure for CDLL828/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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