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Microchip Technology CD829A
- Part No.:
- CD829A
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- Die
- Datasheet:
-
CD829A.pdf
- Description:
- DIODE ZENER 6.2V DIE
- Quantity:
- Payment:
- Shipping:
Inventory:3,675
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Product details
Overview
CD829A from Microsemi is a monolithic temperature-compensated zener reference diode die, designed as a precision voltage reference in high-reliability analog circuits, with nominal zener voltage 5.9–6.5 V at 7.5 mA test current, 5 Ω maximum zener impedance, and ±0.0005 %/°C effective temperature coefficient over –55°C to +100°C.
For engineers reviewing the CD829A datasheet, CD829A pinout, CD829A application, or CD829A equivalent, this part supports critical biasing, calibration, and reference functions in aerospace power supplies, radiation-hardened instrumentation, and military-grade voltage monitoring systems where long-term stability and wide-temperature operation are mandatory.
Technical Context
The CD829A is a bare-die zener reference fabricated using silicon dioxide junction passivation, enabling operation from –65°C to +175°C ambient and storage temperatures. Its electrical behavior is defined by JEDEC-standardized voltage stability testing across temperature extremes.
It features a cathode-anode two-terminal structure with an isolated gold backside metallization and aluminum top-side terminals (cathode, anode, and non-functional test pad). The device requires cathode-positive biasing relative to anode for proper zener operation and is incompatible with solder reflow die attach.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 5.9–6.5 V at 7.5 mA - defines stable reference output range under nominal bias |
| Zener Impedance | 5 Ω max at IZT - ensures minimal output voltage shift under load transients |
| Temp Coefficient | ±0.0005 %/°C - enables sub-10 ppm/°C drift in precision reference designs |
| Reverse Leakage | 2 μA @ 3 V - confirms low parasitic conduction below knee voltage |
| Operating Temp | –65°C to +175°C - supports deployment in extreme-environment avionics and downhole electronics |
| Package Type | Bare die (JANHC/JANKC qualified) - requires wire bonding and electrically isolated die attach |
Pinout & Package
CD829A is supplied as a bare semiconductor die with three top-side aluminum metallized terminals and gold backside metallization. The die must be mounted with electrically isolated die attach to prevent backside conduction. Package dimensions: 0.030" × 0.030" (0.76 mm × 0.76 mm) nominal, thickness 0.010" ±0.002".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Top, Al) | Cathode | Positive terminal during zener operation; must be biased above anode |
| 2 (Top, Al) | Anode | Negative terminal; referenced to system ground or return path |
| 3 (Top, Al) | Test Pad | Non-functional; used only for wire bond process evaluation - no electrical connection |
Key Features
| Feature | Design Value |
|---|---|
| Monolithic temperature compensation | Enables <10 ppm/°C total drift without external circuitry |
| Silicon dioxide junction protection | Prevents contamination-induced parameter shift in harsh environments |
| JANHC/JANKC qualification | Meets MIL-PRF-19500/159 for high-reliability defense and space applications |
| Gold backside metallization | Ensures stable thermal and electrical interface with insulated die attach materials |
Applications
| Aerospace Power Reference | Military Instrumentation Calibration |
|---|---|
Use Scenario: Precision voltage reference in satellite DC-DC converter feedback loops operating across –55°C to +125°C orbital thermal cycles. IC Role / Device Role / Timing Role: Zener reference diode providing stable 6.2 V bias point for error amplifier input. Use Value: Sub-10 ppm/°C drift ensures <0.01% output regulation error over full mission temperature range. | Use Scenario: Calibration standard in portable field-test equipment for analog sensor signal conditioning modules. IC Role / Device Role / Timing Role: Primary reference element in 4½-digit multimeter front-end voltage divider networks. Use Value: 5 Ω zener impedance minimizes loading error when driving high-impedance op-amp inputs. |
| Radiation-Hardened Sensor Biasing | Downhole Oilfield Electronics |
Use Scenario: Bias voltage source for radiation-tolerant op-amps in nuclear reactor monitoring systems exposed to >10⁶ rad(Si) total ionizing dose. IC Role / Device Role / Timing Role: Stable reference node for transimpedance amplifiers converting photodiode current to voltage. Use Value: Silicon dioxide passivation prevents parametric degradation under ionizing radiation exposure. | Use Scenario: Reference element in pressure transducer signal conditioning ASICs deployed at 175°C bottom-hole temperatures. IC Role / Device Role / Timing Role: Zener-based voltage reference for ADC reference buffer stage in high-temp data acquisition units. Use Value: –65°C to +175°C operating range allows uninterrupted operation without derating or cooling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD829 | Zener impedance 5 Ω (same), but effective tempco ±0.0005 %/°C (same); lacks JANKC qualification | Not rated for extended reliability screening per MIL-PRF-19500/159 | Select CD829A when JANHC/JANKC qualification and guaranteed tempco performance are required |
| CD827A | Same package and qualification; zener impedance 9 Ω, tempco ±0.001 %/°C - higher drift | Acceptable where <20 ppm/°C drift is tolerable and lower cost is prioritized | Choose CD827A only if reference stability requirements are relaxed by factor of 2 |
Compared with CD829 and CD827A, the CD829A delivers identical zener impedance and the lowest temperature coefficient in its family, making it the preferred choice for applications demanding the highest absolute voltage stability across military and aerospace temperature extremes.
Availability
CD829A is available at Aetrix Electronics and suitable for aerospace power supplies, military instrumentation calibration, and radiation-hardened sensor biasing requiring stable component supply with full traceability and long-lifecycle support.
Supply support for CD829A 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, radiation-tolerant, and military-qualified analog and mixed-signal components.
The CD829A belongs to Microsemi's legacy MIL-PRF-19500/159-qualified zener reference die family, engineered specifically for precision voltage referencing in defense, space, and industrial systems where parameter stability under thermal and radiation stress is non-negotiable.
FAQ
What is the zener voltage tolerance of CD829A?
The CD829A has a specified zener voltage range of 5.9 V to 6.5 V at 7.5 mA test current. This 600 mV span reflects manufacturing tolerance under JEDEC-standardized test conditions and is not a drift specification. For applications requiring tighter initial tolerance, system-level trimming or selection-binning may be necessary, as CD829A itself is not offered in tighter voltage grades.
Is CD829A compatible with solder reflow die attach?
No, CD829A is explicitly incompatible with solder reflow die attach techniques, as stated in the LDS-0052 datasheet. It requires wire bonding and electrically isolated die attach methods such as conductive epoxy or thermosonic bonding. Using solder reflow risks metallurgical damage to the aluminum top-side terminals and compromises long-term reliability.
What does the "A" suffix in CD829A signify?
The "A" suffix in CD829A denotes JANKC qualification level per MIL-PRF-19500/159, indicating enhanced screening including extended temperature cycling, burn-in, and parametric verification beyond baseline JANHC. CD829A also features reduced zener impedance (13 Ω vs. 15 Ω for CD829) and identical ultra-low temperature coefficient (±0.0005 %/°C).
Can CD829A be used as a direct replacement for 1N829?
Yes, CD829A is electrically equivalent to 1N829 per the datasheet, sharing identical zener voltage range, test current, impedance, and temperature coefficient. However, CD829A is a bare die while 1N829 is a through-hole packaged device; mechanical integration differs significantly, requiring custom die mounting and wire bonding instead of PCB insertion.
What is the purpose of the third metallized pad on CD829A?
The third aluminum pad on CD829A is a dedicated test pad used solely for wire bond process evaluation during manufacturing. It has no electrical function in circuit operation, makes no internal connection to the zener junction, and must not be bonded or connected in end-use assemblies - doing so may compromise device performance or reliability.
CD829A 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):
- 13 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
CD829A FAQ
1.How can I place an order for CD829A through Aetrix?
Please submit a Request for Quotation (RFQ) for CD829A 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 CD829A reliable?
The price and inventory of CD829A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD829A is usually 5 days.
3.What payment methods are accepted for CD829A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD829A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD829A?
CD829A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD829A 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 CD829A?
For technical support, including CD829A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD829A requirements.
6.How does Aetrix verify that CD829A is sourced from the original manufacturer or authorized distributors?
All CD829A 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 CD829A meets industry standards.
7.What is the process for return or replacement of CD829A?
All CD829A units undergo pre-shipment inspection (PSI). If there is an issue with CD829A, 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 CD829A part is unused and in its original packaging.
Return procedure for CD829A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CD829A Tags
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