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Microchip Technology 1N829
- Part No.:
- 1N829
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N829.pdf
- Description:
- DIODE ZENER 6.2V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:55
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Product details
Overview
1N829 from Microsemi is a temperature-compensated Zener reference diode with nominal zener voltage 6.15 V, ±0.0005 %/°C temperature coefficient, and DO-35 glass axial-leaded package. It delivers stable voltage reference at 7.5 mA test current with 5 mV max voltage drift over –55°C to +100°C, used in precision instrumentation power supplies.
For engineers reviewing the 1N829 datasheet, 1N829 pinout, 1N829 application, or 1N829 equivalent, key selection criteria include ultra-low TC (0.0005%/°C), tight VZ tolerance options via suffix (e.g., 1N829-1-1%), MIL-PRF-19500/159 qualification capability, and hermetic DO-35 packaging for high-reliability environments.
Technical Context
This device belongs to Microsemi's JEDEC-registered 1N821–1N829A series of zero-TC reference diodes, engineered to minimize voltage change across temperature via internal compensation architecture. It operates optimally at 7.5 mA, where zener impedance is specified at 15 Ω and reverse leakage is ≤2.0 µA at 3 V.
The 1N829 achieves its 0.0005%/°C effective temperature coefficient through metallurgical design and process-controlled doping, enabling stable reference performance in aerospace and military systems requiring operation from –65°C to +175°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 5.9–6.5 V at IZT = 7.5 mA; center nominal 6.15 V for tight-tolerance variants |
| Temp Coefficient (αVZ) | ±0.0005 %/°C - enables sub-mV drift over –55°C to +100°C |
| Zener Impedance (ZZT) | 15 Ω @ 7.5 mA - ensures low dynamic error under load transients |
| Max ΔVZT | 5 mV over –55°C to +100°C - guarantees absolute voltage stability in wide-temp designs |
| Reverse Leakage (IR) | ≤2.0 µA @ 3 V - minimizes parasitic current draw in high-impedance bias networks |
| Power Dissipation | 500 mW @ TL = 25°C - supports continuous operation with adequate heatsinking |
| Operating Temp Range | –65°C to +175°C - qualified for extended-range military and downhole applications |
Pinout & Package
Hermetically sealed glass DO-35 (DO-204AH) axial-leaded package with cathode band marking; leads are tin-lead plated per MIL-STD-750 Method 2026. Polarity: banded end is anode (positive) when operated as reference diode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (banded end) | Reference output node | Connected to system ground or low-impedance return; defines reference potential |
| Cathode (unbanded end) | Input terminal | Connected to positive supply via current-limiting resistor; reverse-biased during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Internal metallurgical bond option | Available with "-1" suffix (e.g., 1N829-1); improves thermal coupling and long-term stability |
| MIL-PRF-19500/159 qualification path | Supported via JAN/JANTX/JANTXV prefix + "-1" suffix (e.g., JANTX1N829-1) |
| Tight tolerance customization | 1%, 2%, or 3% VZ tolerance enabled by hyphenated suffix (e.g., 1N829-1-1%) |
| ESD robustness | Nonsensitive per MIL-STD-750 Method 1020 - eliminates need for external ESD protection |
| Low capacitance | ≤100 pF - preserves high-frequency response in fast-settling reference circuits |
Applications
| High-Precision ADC Reference | Aerospace Power Monitoring |
|---|---|
Use Scenario: Providing stable reference voltage for 16-bit+ successive-approximation ADCs in data acquisition systems. IC Role / Device Role / Timing Role: Voltage reference source for analog-to-digital conversion accuracy. Use Value: 0.0005%/°C TC and 5 mV ΔVZT ensure <±1 LSB error over full industrial temperature range. | Use Scenario: Regulating reference voltage in flight control sensor signal conditioning modules operating at –55°C to +125°C. IC Role / Device Role / Timing Role: Primary voltage reference for analog front-end amplifiers and comparators. Use Value: Hermetic DO-35 package and –65°C to +175°C rating support mission-critical reliability in avionics. |
| Military Grade Power Supply | Downhole Oilfield Instrumentation |
Use Scenario: Stabilizing feedback node in regulated DC-DC converters for tactical radios and EW systems. IC Role / Device Role / Timing Role: Precision shunt regulator in isolated secondary-side feedback loops. Use Value: MIL-PRF-19500/159 qualification path (JANTX1N829-1) satisfies defense procurement requirements. | Use Scenario: Biasing pressure/temperature sensor bridges in borehole logging tools exposed to >150°C ambient. IC Role / Device Role / Timing Role: Temperature-stable excitation source for Wheatstone bridge sensors. Use Value: 0.0005%/°C TC and 175°C max operating temperature prevent calibration drift in geothermal environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N829A | Zener impedance reduced to 10 Ω; same VZ range and TC (0.0005%/°C) | Better dynamic regulation in fast-transient loads; identical temp stability and military qualification path | Select 1N829A when lower impedance is required without sacrificing TC performance |
| LM399H | Buried-Zener IC with 0.3 ppm/°C TC, 6.95 V output, requires 10 mA bias and external heater control | Higher accuracy and lower TC but larger footprint, higher power, and active circuitry vs. passive 1N829 | Choose LM399H only when sub-ppm stability justifies complexity and cost; 1N829 remains optimal for passive, low-power, hermetic needs |
Compared with 1N829A and LM399H, the 1N829 offers the best balance of ultra-low TC (0.0005%/°C), passive simplicity, DO-35 hermeticity, and MIL-qualified scalability-making it ideal for space-constrained, high-reliability analog references where active components are undesirable.
Availability
1N829 is available at Aetrix Electronics and suitable for precision instrumentation, aerospace power monitoring, and military-grade power supply designs requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 1N829 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 1N829 belongs to Microsemi's legacy Scottsdale Division DO-35 Zener reference diode family, designed specifically for applications demanding minimal voltage drift over extreme temperatures and long-term stability in mission-critical systems.
FAQ
What is the nominal zener voltage of the 1N829?
The 1N829 has a nominal zener voltage of 6.15 V, with a specified range of 5.9 V to 6.5 V at 7.5 mA test current. Tighter tolerances (e.g., ±1%) are available by adding a hyphenated suffix such as "1N829-1-1%", where "-1" denotes internal metallurgical bond and "-1%" specifies the voltage tolerance.
Does the 1N829 require external temperature compensation?
No, the 1N829 does not require external temperature compensation. It is a temperature-compensated Zener reference diode with an effective temperature coefficient of ±0.0005 %/°C, achieved through internal metallurgical design. This allows the 1N829 to maintain stable output without additional circuitry across –55°C to +100°C.
What package type is used for the 1N829?
The 1N829 is supplied in a hermetically sealed glass DO-35 (DO-204AH) axial-leaded package. The cathode is marked with a band on the glass body, and leads are tin-lead plated per MIL-STD-750 Method 2026. This package supports soldering at 260°C for 10 seconds maximum.
Can the 1N829 be qualified to military specifications?
Yes, the 1N829 can be qualified to MIL-PRF-19500/159 Class B (JAN), Class S (JANTX), or Class V (JANTXV) when ordered with both the appropriate prefix (e.g., JANTX) and the "-1" suffix (e.g., JANTX1N829-1). This qualification path applies only to versions with internal metallurgical bond construction.
What is the maximum allowable voltage drift of the 1N829 over temperature?
The 1N829 exhibits a maximum voltage drift of 5 mV over the temperature range of –55°C to +100°C, as specified in the electrical characteristics table. This ∆VZT value reflects the total observed change in zener voltage at any discrete temperature within that range, ensuring predictable performance in precision analog circuits.
1N829 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 6.2 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 15 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 3 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -55°C ~ 175°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
1N829 FAQ
1.How can I place an order for 1N829 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N829 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 1N829 reliable?
The price and inventory of 1N829 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N829 is usually 5 days.
3.What payment methods are accepted for 1N829?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N829 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N829?
1N829 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N829 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 1N829?
For technical support, including 1N829 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N829 requirements.
6.How does Aetrix verify that 1N829 is sourced from the original manufacturer or authorized distributors?
All 1N829 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 1N829 meets industry standards.
7.What is the process for return or replacement of 1N829?
All 1N829 units undergo pre-shipment inspection (PSI). If there is an issue with 1N829, 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 1N829 part is unused and in its original packaging.
Return procedure for 1N829:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N829 Tags
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