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Microchip Technology CD829
- Part No.:
- CD829
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- Die
- Datasheet:
-
CD829.pdf
- Description:
- DIODE ZENER 6.2V DIE
- Quantity:
- Payment:
- Shipping:
Inventory:4,154
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Product details
Overview
CD829 from Microsemi is a monolithic temperature-compensated zener reference diode die, designed for precision voltage reference applications in high-reliability military and aerospace systems. It delivers 5.9–6.5 V zener voltage at 7.5 mA test current, with 5 Ω zener impedance and ±0.0005 %/°C effective temperature coefficient over –55°C to +100°C.
For engineers reviewing the CD829 datasheet, CD829 pinout, CD829 application, or CD829 equivalent, this device is selected for ultra-stable voltage references where low thermal drift, low dynamic impedance, and extended temperature operation (–65°C to +175°C) are critical design requirements.
Technical Context
The CD829 operates as a two-terminal voltage reference with cathode-positive biasing relative to anode. Its monolithic construction integrates full silicon dioxide junction protection and supports wire bonding and conductive die attach-excluding solder reflow.
It meets MIL-PRF-19500/159 qualification (JANHC level), with reverse leakage limited to 2 μA at 3 Vdc and guaranteed stability across –55°C to +100°C per JEDEC Std No. 5A, evidenced by its 5 mV maximum voltage excursion over that range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 5.9–6.5 V at 7.5 mA - defines nominal reference output under standard test conditions |
| Zener Impedance | 5 Ω - ensures minimal output voltage variation under load transients |
| Temp. Coefficient | ±0.0005 %/°C - enables sub-10 ppm/°C drift for high-precision analog systems |
| Voltage Stability | ±5 mV over –55°C to +100°C - guarantees bounded reference error across wide operating range |
| Operating Temp. | –65°C to +175°C - supports deployment in extreme-environment avionics and downhole electronics |
| Reverse Leakage | 2 μA @ 3 Vdc - confirms low power loss and minimal error contribution in high-impedance bias networks |
Pinout & Package
CD829 is supplied as an unmounted bare die in JANHC-qualified ceramic package. The chip features three metallized terminals: Cathode (Al top), Anode (Al top), and non-functional test pad (Al top). Backside is gold-plated and must be electrically isolated during mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Top) | Positive terminal for zener conduction | Must be biased positive relative to anode to enable regulated breakdown operation |
| Anode (Top) | Negative terminal for zener conduction | Serves as reference ground node in series-shunt regulator configurations |
| Test Pad (Top) | Non-electrical evaluation feature | Used only for wire bond process validation; no electrical connection or circuit function |
Key Features
| Feature | Design Value |
|---|---|
| Monolithic temperature compensation | Integrates matched junctions to cancel thermal drift, achieving ±0.0005 %/°C TC |
| Full SiO₂ junction protection | Prevents contamination and surface leakage, ensuring long-term parameter stability in harsh environments |
| JANHC qualification | Qualified to MIL-PRF-19500/159 for use in Class H (–65°C to +175°C) military applications |
| Low dynamic impedance | 5 Ω at 7.5 mA enables tight regulation under varying load currents without external buffering |
Applications
| Avionics Power Reference | Satellite ADC Biasing |
|---|---|
Use Scenario: Precision voltage reference for analog-to-digital converter (ADC) bias networks in flight control computers. IC Role / Device Role / Timing Role: Zener reference diode providing stable excitation voltage to ADC internal reference ladder. Use Value: ±5 mV voltage stability over –55°C to +100°C ensures <0.01% full-scale error drift across operational envelope. | Use Scenario: Reference source for radiation-hardened telemetry conditioning circuits aboard LEO satellites. IC Role / Device Role / Timing Role: Primary voltage reference in low-power, high-reliability sensor signal chains. Use Value: 5 Ω zener impedance minimizes noise coupling into sensitive front-end amplifiers during orbital thermal cycling. |
| Downhole Logging Sensor | Military Grade DAC Calibration |
Use Scenario: Voltage reference for pressure and temperature sensor signal conditioning in oil/gas well logging tools. IC Role / Device Role / Timing Role: Stable 6.2 V reference for ratiometric sensor excitation and analog front-end gain setting. Use Value: –65°C to +175°C operating range allows uninterrupted operation at >150°C downhole temperatures without derating. | Use Scenario: Calibration reference for 16-bit digital-to-analog converters in secure communications equipment. IC Role / Device Role / Timing Role: Precision shunt reference used in closed-loop DAC output trimming circuits. Use Value: ±0.0005 %/°C temperature coefficient enables <1 LSB error over full military temperature range (–55°C to +125°C). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD827A | Same 5.9–6.5 V range and 7.5 mA IZT, but 9 Ω zener impedance and ±0.001 %/°C TC - higher drift and impedance than CD829 | Acceptable where ±10 ppm/°C drift and 9 Ω impedance meet system spec; lower cost alternative | Select CD827A only if system-level drift budget allows 2× higher TC and 80% higher ZZT |
| 1N829 | Electrically equivalent per datasheet, but packaged in DO-35 glass axial leaded case - not bare die; different thermal mass and mounting constraints | Used in board-level designs requiring through-hole assembly; unsuitable for hybrid or chip-and-wire assemblies | Choose 1N829 only for PCB-mounted legacy designs; CD829 required for hermetic hybrid or multichip module integration |
Compared with CD827A and 1N829, the CD829 offers the lowest temperature coefficient (±0.0005 %/°C) and lowest dynamic impedance (5 Ω) in the CD821–CD829A family, making it optimal for ultra-stable reference nodes where die-level integration and minimal thermal drift are mandatory.
Availability
CD829 is available at Aetrix Electronics and suitable for avionics power reference, satellite ADC biasing, and downhole logging sensor applications requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for CD829 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 and mixed-signal components for aerospace, defense, and industrial markets.
The CD829 belongs to Microsemi's qualified monolithic zener reference die family, engineered specifically for precision voltage references in mission-critical systems where extended temperature operation and radiation tolerance are essential.
FAQ
What is the zener voltage tolerance of CD829?
The CD829 has a zener voltage range of 5.9 V to 6.5 V at 7.5 mA test current, as specified in the LDS-0052 datasheet. This 600 mV span reflects manufacturing tolerance for the bare die; actual unit-level voltage is not binned. System-level calibration must accommodate this full range when using CD829 in precision reference designs.
Is CD829 compatible with solder reflow assembly?
No, CD829 is explicitly incompatible with solder reflow per the LDS-0052 datasheet. It supports only wire bonding and conductive die attach methods. Solder reflow causes irreversible degradation due to thermal stress on the monolithic structure and SiO₂ passivation layer. Mounting must follow JANHC die attach guidelines to preserve CD829 performance and qualification.
What does the "A" suffix mean in CD829A versus CD829?
The CD829A variant differs from CD829 in zener impedance (13 Ω vs. 15 Ω) and effective temperature coefficient (±0.0005 %/°C for both), with identical voltage range and test current. CD829A is qualified to JANKC level, while CD829 is JANHC - indicating tighter screening and higher reliability assurance for CD829 in critical applications.
Can CD829 be used as a direct replacement for 1N829?
The CD829 is electrically equivalent to 1N829 per the datasheet, but they are not mechanically interchangeable. CD829 is a bare die requiring hybrid mounting; 1N829 is a DO-35 packaged device. Substituting CD829 for 1N829 requires redesigning the assembly process, substrate layout, and thermal management - it is not a drop-in replacement.
What is the maximum allowable reverse leakage current for CD829?
The maximum reverse leakage current for CD829 is 2 μA at 25°C and VR = 3 Vdc, as stated in the LDS-0052 datasheet. This value is measured under standardized conditions and remains valid across the full operating temperature range only when derated per manufacturer's leakage vs. temperature curves - actual leakage may increase above 2 μA at elevated temperatures.
CD829 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- Die
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 6.2 V
- Tolerance:
- ±4.83%
- Power - Max:
- -
- 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:
- Die
CD829 FAQ
1.How can I place an order for CD829 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD829 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 CD829 reliable?
The price and inventory of CD829 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD829 is usually 5 days.
3.What payment methods are accepted for CD829?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD829 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD829?
CD829 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD829 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 CD829?
For technical support, including CD829 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD829 requirements.
6.How does Aetrix verify that CD829 is sourced from the original manufacturer or authorized distributors?
All CD829 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 CD829 meets industry standards.
7.What is the process for return or replacement of CD829?
All CD829 units undergo pre-shipment inspection (PSI). If there is an issue with CD829, 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 CD829 part is unused and in its original packaging.
Return procedure for CD829:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CD829 Tags
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