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Microchip Technology 1N829/TR
- Part No.:
- 1N829/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N829/TR.pdf
- Description:
- DIODE ZENER 6.2V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:6,800
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Product details
Overview
1N829/TR from Central Semiconductor (CDI Diodes) is a temperature-compensated, hermetically sealed MELF (DO-213AA) Zener diode with nominal zener voltage 5.9–6.5 V, 7.5 mA test current, 5 Ω zener impedance, and ±0.0005 %/°C temperature coefficient. It delivers high stability for precision voltage reference in aerospace-grade power regulation circuits.
For engineers reviewing the 1N829/TR datasheet, 1N829/TR pinout, 1N829/TR application, or 1N829/TR equivalent, key selection criteria include its ultra-low tempco, low dynamic impedance, MIL-PRF-19500/159 qualification (JAN/JANTXV), DO-213AA glass package, and operation across –65°C to +175°C.
Technical Context
The 1N829/TR uses metallurgically bonded, double-plug construction to achieve tight thermal tracking between complementary junctions-enabling cancellation of voltage drift over temperature. Its zener impedance remains stable at ≤5 Ω under 7.5 mA test current and exhibits minimal variation across –65°C to +175°C ambient.
This device operates as a two-terminal, cathode-banded voltage reference requiring reverse bias. It meets JEDEC Std No. 5 for temperature stability verification and supports leadless surface-mount mounting on substrates with matched axial CTE (~6 ppm/°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage Range | 5.9–6.5 V @ 7.5 mA - defines usable reference window for precision analog circuitry |
| Zener Impedance | 5 Ω @ 7.5 mA - ensures minimal output voltage shift under load transients |
| Tempco | ±0.0005 %/°C - enables <±0.5 mV drift over full –65°C to +175°C range |
| Power Dissipation | 500 mW @ +50°C - supports robust operation in high-reliability power rails |
| Operating Temp | –65°C to +175°C - qualified for extreme-environment avionics and downhole electronics |
| Reverse Leakage | 2 µA @ 3 V - guarantees low standby current in battery-backed reference designs |
Pinout & Package
Package: DO-213AA (MELF, SOD-80, LL34), hermetically sealed glass case with tin/lead lead finish. Cathode identified by band; operated in reverse bias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to system ground or low-impedance return path; must sink reverse current |
| Cathode | Stabilized output node | Banded end supplies regulated voltage; requires current-limiting resistor upstream |
Key Features
| Feature | Design Value |
|---|---|
| Temperature Compensation | Double-plug junction architecture cancels thermal drift, achieving ±0.0005 %/°C spec |
| MIL-PRF-19500/159 Qualification | Available as 1N829UR-1 in JAN/JANTXV grades for defense and space applications |
| Hermetic Glass Encapsulation | DO-213AA package prevents moisture ingress and ensures long-term parametric stability |
| Low Dynamic Impedance | 5 Ω at 7.5 mA enables fast transient response in feedback loops and reference buffers |
Applications
| Aerospace Power Regulation | Downhole Instrumentation |
|---|---|
Use Scenario: Voltage reference in DC-DC converter feedback networks aboard satellites and launch vehicles. IC Role / Device Role / Timing Role: Precision zener reference providing stable setpoint for error amplifiers in isolated flyback controllers. Use Value: Ultra-low tempco ensures <±0.5 mV reference shift across orbital thermal cycles (–65°C to +125°C). | Use Scenario: Biasing and calibration reference in high-temperature logging tools deployed in oil/gas wells. IC Role / Device Role / Timing Role: Primary voltage standard for ADC front-end gain/offset trimming and sensor excitation circuits. Use Value: Hermetic DO-213AA package and –65°C to +175°C rating prevent parameter drift at 150°C+ downhole ambient. |
| Avionics Sensor Signal Conditioning | Military Radio Frequency Reference |
Use Scenario: Stable reference for bridge-based pressure and acceleration sensors in flight control systems. IC Role / Device Role / Timing Role: Low-noise, low-impedance reference source for instrumentation amplifier common-mode setting and ratiometric scaling. Use Value: 5 Ω zener impedance minimizes noise coupling and maintains PSRR >80 dB up to 100 kHz. | Use Scenario: Local oscillator frequency stabilization and PLL reference in tactical HF/VHF transceivers. IC Role / Device Role / Timing Role: Temperature-stable voltage reference for VCXO bias networks and synthesizer DAC calibration. Use Value: ±0.0005 %/°C tempco eliminates need for external compensation in compact RF modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N829UR-1 (JANTXV) | Same electrical specs; screened per MIL-PRF-19500/159, enhanced reliability testing, hermetic metal-glass package | Required for Class H/K military/aerospace programs with radiation tolerance and lot traceability mandates | Select when full MIL-spec conformance, extended burn-in, and radiation hardness are mandatory |
| CDLL829A | Identical zener voltage, tempco, and impedance; lower 10 mA test current vs. 7.5 mA; same DO-213AA package | Suitable for commercial/industrial designs where tighter initial tolerance isn't required and lower test current simplifies bias design | Select for cost-sensitive industrial applications needing same stability but relaxed screening and procurement timelines |
Compared with 1N829/TR, the 1N829UR-1 adds military-grade screening and packaging for mission-critical use, while CDLL829A offers identical performance at lower test current-reducing bias resistor power loss without sacrificing stability in non-military systems.
Availability
1N829/TR is available at Aetrix Electronics and suitable for aerospace power regulation, downhole instrumentation, avionics sensor conditioning, and military radio frequency reference applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 1N829/TR 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
Central Semiconductor Corp. (CDI Diodes) designs and manufactures high-reliability discrete semiconductors for aerospace, defense, and industrial markets, with emphasis on ruggedized Zener references and switching devices.
The 1N829/TR belongs to CDI's temperature-compensated Zener diode family engineered specifically for precision voltage referencing in extreme-temperature, high-reliability systems where parametric stability is non-negotiable.
FAQ
What is the zener voltage tolerance of the 1N829/TR?
The 1N829/TR 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 the inherent manufacturing tolerance for this temperature-compensated grade. The actual measured value for any given unit falls within that band, and the ultra-low ±0.0005 %/°C tempco ensures minimal drift across temperature extremes. For tighter initial tolerance, consider the screened 1N829UR-1 variant.
Is the 1N829/TR suitable for surface-mount assembly?
Yes, the 1N829/TR uses the DO-213AA (MELF) package, which is a leadless, cylindrical glass case designed for surface-mount reflow soldering. Its axial coefficient of expansion (~6 ppm/°C) is matched to common PCB substrates, minimizing mechanical stress during thermal cycling. Mounting position is unrestricted, and no special orientation is required beyond cathode band identification.
Does the 1N829/TR require derating above +50°C?
Yes, the 1N829/TR has a maximum DC power dissipation of 500 mW at +50°C, with linear derating at 4 mW/°C above that temperature. At +125°C ambient, the allowable dissipation drops to 200 mW. This derating curve is defined in Figure 2 of the datasheet and must be applied in thermal design to ensure long-term reliability under sustained high-temperature operation.
How does the 1N829/TR achieve its ultra-low temperature coefficient?
The 1N829/TR achieves ±0.0005 %/°C tempco via metallurgically bonded, double-plug construction-two complementary Zener junctions integrated into a single die to cancel opposing thermal voltage drifts. This intrinsic compensation eliminates reliance on external components and provides stable performance across –65°C to +175°C without calibration or trimming.
Can the 1N829/TR replace standard Zener diodes like the 1N4735A?
No-the 1N829/TR is not a drop-in replacement for general-purpose Zeners such as the 1N4735A. It features significantly lower tempco (±0.0005 %/°C vs. ±0.07 %/°C), lower impedance (5 Ω vs. ~10 Ω), and MIL-spec variants, but also requires careful thermal management and is optimized for high-reliability reference use-not basic voltage clamping. Substitution demands full circuit validation.
1N829/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- 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/TR FAQ
1.How can I place an order for 1N829/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N829/TR 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/TR reliable?
The price and inventory of 1N829/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N829/TR is usually 5 days.
3.What payment methods are accepted for 1N829/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N829/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N829/TR?
1N829/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N829/TR 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/TR?
For technical support, including 1N829/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N829/TR requirements.
6.How does Aetrix verify that 1N829/TR is sourced from the original manufacturer or authorized distributors?
All 1N829/TR 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/TR meets industry standards.
7.What is the process for return or replacement of 1N829/TR?
All 1N829/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N829/TR, 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/TR part is unused and in its original packaging.
Return procedure for 1N829/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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