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Microchip Technology CD828
- Part No.:
- CD828
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- Die
- Datasheet:
-
CD828.pdf
- Description:
- DIODE ZENER 6.55V DIE
- Quantity:
- Payment:
- Shipping:
Inventory:5,834
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Product details
Overview
CD828 from Microsemi is a monolithic temperature-compensated zener reference die with nominal zener voltage 6.2–6.9 V, test current 7.5 mA, zener impedance 15 Ω, max voltage drift ±10 mV over –55°C to +100°C, and tempco 0.001 %/°C - used in precision voltage references for aerospace power conditioning and radiation-hardened instrumentation.
For engineers reviewing the CD828 datasheet, CD828 pinout, CD828 application, or CD828 equivalent, key selection criteria include its ultra-low temperature coefficient, tight voltage tolerance, high-temperature operation up to +175°C, MIL-PRF-19500/159 qualification, and die-level form factor requiring wire bonding.
Technical Context
The CD828 is a bare silicon die designed for hybrid microcircuit integration, featuring fully passivated junctions with silicon dioxide protection and gold back metallization for reliable die attach. It operates as a two-terminal voltage reference where cathode must be biased positive relative to anode.
Its electrical behavior is defined under JEDEC-standard test conditions: zener impedance measured with 10% 60 Hz AC superimposed on 7.5 mA DC test current, and voltage stability verified across –55°C to +100°C per Note 2 of LDS-0052 Rev. 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 6.2–6.9 V at 7.5 mA - defines stable reference output range under nominal bias |
| Zener Test Current | 7.5 mA - required bias current to achieve specified voltage and impedance performance |
| Zener Impedance | 15 Ω - low dynamic resistance ensures minimal output variation under load transients |
| Voltage Temp Stability | ±10 mV over –55°C to +100°C - guarantees bounded drift without external compensation |
| Temp Coefficient | 0.001 %/°C - enables high-accuracy reference design in wide-temperature environments |
| Operating Temp Range | –65°C to +175°C - supports deployment in extreme aerospace and downhole applications |
| Reverse Leakage | 2 μA @ 3 V - confirms low parasitic conduction below breakdown threshold |
Pinout & Package
CD828 is supplied as an unmounted silicon die (not packaged) with three metallized terminals: Cathode (Al top), Anode (Al top), and Test Pad (Al top, non-functional). Backside is Au metallized and must remain electrically isolated. Die thickness is 0.25 mm ±0.05 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Top) | Positive terminal during zener operation | Must be biased higher than anode; primary current entry point in regulation mode |
| Anode (Top) | Negative terminal during zener operation | Reference ground node; current exit path during reverse-bias regulation |
| Test Pad (Top) | Non-functional evaluation feature | Used only for wire bond process validation; no electrical connection in final circuit |
Key Features
| Feature | Design Value |
|---|---|
| Monolithic temp-compensated structure | Integrates curvature-correction elements on single die to achieve 0.001 %/°C tempco |
| Silicon dioxide junction protection | Ensures long-term reliability in humid, high-voltage, or radiation-exposed environments |
| MIL-PRF-19500/159 qualified | Meets military screening requirements including burn-in, thermal shock, and life testing |
| Wire bond compatible metallization | Al top layer and Au backside support wedge or ball bonding without solder reflow |
| Die-level form factor | Enables custom hybrid packaging in multi-chip modules where leaded packages are impractical |
Applications
| Spacecraft Power Bus Monitor | Radiation-Hardened Instrumentation |
|---|---|
Use Scenario: Monitoring regulated 28 V bus voltage in LEO satellite power distribution units. IC Role / Device Role / Timing Role: Precision voltage reference for ADC input scaling and comparator thresholds. Use Value: ±10 mV stability over –55°C to +100°C eliminates need for software calibration across orbital thermal cycles. | Use Scenario: Front-end signal conditioning in nuclear reactor neutron flux sensors. IC Role / Device Role / Timing Role: Stable bias reference for low-noise op-amp stages operating at +125°C ambient. Use Value: 0.001 %/°C tempco maintains <0.1% gain error over full temperature range without trimming. |
| Downhole Telemetry Module | Aerospace Avionics Reference |
Use Scenario: Voltage reference in MWD (measurement-while-drilling) tools exposed to 175°C wellbore temperatures. IC Role / Device Role / Timing Role: Zener element embedded in thick-film hybrid circuit for analog front-end regulation. Use Value: Qualified operation to +175°C and SiO₂ passivation prevent parametric shift after 500+ hours at temperature. | Use Scenario: Reference source in flight control computer analog-to-digital conversion subsystem. IC Role / Device Role / Timing Role: Primary voltage standard for redundant sensor signal digitization paths. Use Value: MIL-PRF-19500/159 qualification ensures traceable lot acceptance and failure rate compliance per DO-254. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD827A | Zener voltage 5.9–6.5 V; same 0.001 %/°C tempco and ±9 mV stability, but lower max voltage range | Better suited for 6.0 V nominal systems where tighter initial tolerance is prioritized over upper-range margin | Select CD827A when system nominal voltage is 6.0 V and tighter initial VZ binning is required |
| CD829 | Zener voltage 5.9–6.5 V; superior ±5 mV stability and 0.0005 %/°C tempco, but higher cost and longer qualification lead time | Preferred for Class S space applications demanding highest metrological stability and lowest drift | Choose CD829 when absolute minimum drift (<±0.5 mV/°C) justifies premium cost and extended procurement cycle |
Compared with CD827A and CD829, the CD828 offers optimal balance of 6.2–6.9 V coverage, ±10 mV stability, and 0.001 %/°C tempco - making it ideal for commercial-space and high-reliability industrial systems where margin above 6.5 V is needed without Class S-level expense.
Availability
CD828 is available at Aetrix Electronics and suitable for spacecraft power monitoring, downhole telemetry, radiation-hardened instrumentation, and aerospace avionics requiring stable component supply across extended temperature and radiation environments.
Supply support for CD828 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 defense-grade analog and mixed-signal components.
The CD828 belongs to Microsemi's legacy MIL-qualified zener reference die family, engineered specifically for hybrid microcircuit integration in aerospace, defense, and energy exploration systems where hermetic packaging and extreme environmental resilience are mandatory.
FAQ
What is the zener voltage range of the CD828?
The CD828 has a zener voltage range of 6.2 V to 6.9 V when tested at 7.5 mA. This range reflects manufacturing tolerance and is guaranteed per LDS-0052 Rev. 1. The CD828 achieves this specification using monolithic temperature compensation, and the full range is validated across –55°C to +100°C per JEDEC standard No. 5A.
Is the CD828 supplied in a surface-mount package?
No, the CD828 is supplied as an unpackaged silicon die - not a surface-mount or leaded device. It features Al-metallized cathode and anode terminals on the top surface and Au back metallization. Users must integrate the CD828 into hybrid circuits via wire bonding or die attach, with electrically isolated mounting per package drawing LDS-0052.
Does the CD828 require external temperature compensation?
No, the CD828 does not require external temperature compensation. Its monolithic construction integrates curvature correction to deliver a temperature coefficient of 0.001 %/°C and voltage stability of ±10 mV over –55°C to +100°C. This performance is intrinsic to the CD828 die structure and verified in the official Microsemi technical data sheet LDS-0052 Rev. 1.
What qualification standard applies to the CD828?
The CD828 is qualified per MIL-PRF-19500/159, covering screening tests such as steady-state life, thermal shock, and burn-in. This qualification applies to JANHC and JANKC levels, confirming suitability for high-reliability military and aerospace applications. The CD828 datasheet LDS-0052 Rev. 1 explicitly cites this standard on page 2.
Can the CD828 be used in solder reflow processes?
No, the CD828 is not compatible with solder reflow. The datasheet states it is "compatible with all wire bonding and die attach techniques with the exception of solder reflow." Its aluminum top metallization and silicon dioxide passivation are not rated for reflow thermal profiles. Recommended attachment methods include epoxy die bonding or eutectic Au-Si bonding.
CD828 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- Die
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 6.55 V
- Tolerance:
- ±5.34%
- 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
CD828 FAQ
1.How can I place an order for CD828 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD828 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 CD828 reliable?
The price and inventory of CD828 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD828 is usually 5 days.
3.What payment methods are accepted for CD828?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD828 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD828?
CD828 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD828 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 CD828?
For technical support, including CD828 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD828 requirements.
6.How does Aetrix verify that CD828 is sourced from the original manufacturer or authorized distributors?
All CD828 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 CD828 meets industry standards.
7.What is the process for return or replacement of CD828?
All CD828 units undergo pre-shipment inspection (PSI). If there is an issue with CD828, 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 CD828 part is unused and in its original packaging.
Return procedure for CD828:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CD828 Tags
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