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Microchip Technology 1N829A-1
- Part No.:
- 1N829A-1
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N829A-1.pdf
- Description:
- DIODE ZENER 6.2V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:60
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Product details
Overview
1N829A-1 from Microsemi is a temperature-compensated 6.2 V Zener reference diode in DO-35 glass axial package, with ±5% voltage tolerance, 10 Ω dynamic impedance at 7.5 mA, 0.0005 %/°C temperature coefficient, and 5 mV max voltage drift over –55°C to +100°C - used in precision instrumentation voltage references.
For engineers reviewing the 1N829A-1 datasheet, 1N829A-1 pinout, 1N829A-1 application, or 1N829A-1 equivalent, key selection criteria include ultra-low TC, hermetic DO-35 packaging, MIL-PRF-19500/159 qualification eligibility, and tight thermal stability under 7.5 mA bias current.
Technical Context
The 1N829A-1 employs metallurgical bonding and double-plug construction to achieve exceptional thermal compensation, enabling stable regulation across –55°C to +100°C. Its 0.0005 %/°C TC is the lowest in the 1N821–1N829A series and is specified at 7.5 mA test current.
It operates as a two-terminal shunt reference with cathode-banded polarity (banded end positive), exhibits ≤100 pF capacitance, and maintains <2 µA reverse leakage at 3 V - optimized for low-noise, low-drift analog circuits requiring long-term calibration stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 5.89–6.51 V at 7.5 mA - ensures 6.2 V nominal with ±5% tolerance for precision reference design |
| Temp Coefficient | 0.0005 %/°C - enables sub-5 mV total drift over –55°C to +100°C without external compensation |
| Zener Impedance | 10 Ω at 7.5 mA - minimizes output voltage variation under load current changes |
| Max Power Dissipation | 500 mW at 25°C - supports robust operation with derating above 25°C (3.33 mW/°C) |
| Reverse Leakage | ≤2 µA at 3 V - ensures negligible error contribution in high-impedance reference nodes |
| Junction Temp Range | –55°C to +175°C - compatible with extended industrial and military ambient environments |
Pinout & Package
DO-35 (DO-204AH) glass axial-leaded hermetically sealed package; cathode identified by band on glass body; leads tin-lead (military) or matte-tin (RoHS commercial); weight ≈0.2 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to circuit common; reverse-biased operation requires cathode at higher potential |
| Cathode | Reference output node | Banded end; supplies stable 6.2 V when biased at 7.5 mA; polarity critical for proper regulation |
Key Features
| Feature | Design Value |
|---|---|
| Temperature Compensation | 0.0005 %/°C TC achieved via internal metallurgical bond - eliminates need for external thermistors or trimming |
| Hermetic Glass Package | DO-35 construction with double-plug sealing - ensures long-term parameter stability and moisture resistance |
| Low Dynamic Impedance | 10 Ω at 7.5 mA - reduces sensitivity to supply current fluctuations in feedback loops |
| MIL-PRF-19500/159 Qualifiable | JAN/JANTX/JANTXV/JANS levels available - meets stringent reliability and screening requirements for defense systems |
Applications
| High-Accuracy DMMs | Aerospace ADC References |
|---|---|
Use Scenario: Front-end voltage reference in handheld digital multimeters requiring factory calibration stability over 10-year service life. IC Role / Device Role / Timing Role: Shunt reference providing 6.2 V基准 for 24-bit sigma-delta ADC and auto-zero amplifier stages. Use Value: 5 mV max ∆VZ over –55°C to +100°C prevents recalibration drift; 10 Ω ZZT ensures <1 ppm line regulation error. | Use Scenario: Reference source in radiation-tolerant data acquisition modules aboard satellite telemetry subsystems. IC Role / Device Role / Timing Role: Primary voltage reference for SAR ADCs and precision DACs operating in wide-temperature orbital environments. Use Value: Hermetic DO-35 package and MIL-qualified variants ensure survivability; 0.0005 %/°C TC maintains <±0.5 LSB error across mission thermal cycles. |
| Calibration Standards | Industrial PLC Analog Inputs |
Use Scenario: Transfer standard in metrology labs verifying benchtop power supplies and calibrators traceable to NIST. IC Role / Device Role / Timing Role: Stable 6.2 V node used to null offset and scale gain in 7½-digit DMM reference chains. Use Value: Sub-5 mV total drift and <2 µA IR enable <0.001% absolute accuracy without active temperature control. | Use Scenario: Input scaling reference for 16-bit analog input modules in programmable logic controllers deployed in factory automation cabinets. IC Role / Device Role / Timing Role: Biasing reference for op-amp-based signal conditioning of 4–20 mA loop receivers. Use Value: 10 Ω ZZT and 0.0005 %/°C TC maintain 16-bit linearity across –25°C to +70°C cabinet temperatures without software compensation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N827A-1 | 0.001 %/°C TC (2× higher than 1N829A-1); same 6.2 V range and 10 Ω ZZT | Acceptable where 10 mV max drift suffices; lower cost for non-critical calibration tiers | Select when 0.0005 %/°C TC is not required and budget constraints apply |
| LM399H | 6.95 V buried-Zener with oven-controlled TC of 0.3 ppm/°C; requires 10 mA bias and 1 W heater power | Used in lab-grade instruments; incompatible with low-power or space-constrained designs | Choose only when sub-ppm stability justifies added complexity, power, and footprint |
Compared with 1N827A-1 and LM399H, the 1N829A-1 delivers the lowest TC in its family without external heating or support circuitry - making it optimal for compact, low-power, high-stability embedded references where ovenized solutions are impractical.
Availability
1N829A-1 is available at Aetrix Electronics and suitable for high-reliability instrumentation, aerospace data acquisition, and industrial calibration systems requiring stable component supply and long-term parametric consistency.
Supply support for 1N829A-1 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 Corporation (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 1N829A-1 belongs to Microsemi's legacy JEDEC-registered temperature-compensated Zener reference diode family, engineered specifically for metrology-grade voltage stability in harsh thermal environments.
FAQ
What is the nominal Zener voltage and tolerance of the 1N829A-1?
The 1N829A-1 has a nominal Zener voltage of 6.2 V with a tolerance of ±5%, specified as 5.89–6.51 V at 7.5 mA test current. This range reflects the tightest voltage binning available in the 1N821–1N829A series for commercial-grade units, and is confirmed in the Electrical Characteristics table on page 3 of T4-LDS-0220 Rev. 2.
Does the 1N829A-1 require external temperature compensation?
No, the 1N829A-1 does not require external temperature compensation. Its 0.0005 %/°C temperature coefficient is achieved through internal metallurgical bonding and double-plug construction, delivering only 5 mV maximum voltage change over –55°C to +100°C - a self-contained solution verified in the Temperature Stability column of the datasheet.
Is the 1N829A-1 RoHS compliant?
Yes, the commercial-grade 1N829A-1 is available in RoHS-compliant version with "e3" suffix (e.g., 1N829A-1e3), featuring annealed matte-tin plating. Military-grade versions (JAN/JANTX/etc.) use tin-lead plating and are exempt from RoHS per MIL-PRF-19500/159 requirements - this distinction is explicitly stated in the PART NOMENCLATURE section.
What is the maximum operating current and power dissipation for the 1N829A-1?
The 1N829A-1 supports a maximum Zener current (IZM) of 70 mA and a maximum power dissipation (PD) of 500 mW at 25°C. For optimal voltage-temperature stability, the recommended operating current is 7.5 mA (<50 mW dissipation), with linear derating of 3.33 mW/°C above 25°C - all values are specified in the Maximum Ratings table on page 1.
How is polarity identified on the 1N829A-1 DO-35 package?
Polarity on the 1N829A-1 is identified by a cathode band on the glass body; the banded end is the cathode and must be held at a higher potential than the anode for proper Zener operation. This marking convention and operational polarity are explicitly defined in the MECHANICAL and PACKAGING section on page 2 of the datasheet.
1N829A-1 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):
- 10 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 3 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
1N829A-1 FAQ
1.How can I place an order for 1N829A-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N829A-1 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 1N829A-1 reliable?
The price and inventory of 1N829A-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N829A-1 is usually 5 days.
3.What payment methods are accepted for 1N829A-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N829A-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N829A-1?
1N829A-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N829A-1 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 1N829A-1?
For technical support, including 1N829A-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N829A-1 requirements.
6.How does Aetrix verify that 1N829A-1 is sourced from the original manufacturer or authorized distributors?
All 1N829A-1 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 1N829A-1 meets industry standards.
7.What is the process for return or replacement of 1N829A-1?
All 1N829A-1 units undergo pre-shipment inspection (PSI). If there is an issue with 1N829A-1, 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 1N829A-1 part is unused and in its original packaging.
Return procedure for 1N829A-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N829A-1 Tags
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