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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Microchip Technology 1N829A/TR

Name: 1N829A/TR
Brand: Microchip Technology
SKU: 1N829A/TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N829A/TR

Manufacturer:: Microchip Technology

Category:: Single Zener Diodes

Package:: DO-204AH, DO-35, Axial

Datasheet:: 1N829A/TR.pdf

Description:: DIODE ZENER 6.2V 500MW DO204AH

Quantity:: RFQ Add To RFQ list

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Inventory:9,910

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Product details

Overview

1N829A/TR from Central Semiconductor is a precision temperature-compensated zener diode in hermetically sealed DO-213AA (MELF) glass package, rated for 5.9–6.5 V zener voltage at 7.5 mA test current, 5 Ω zener impedance, and ±0.0005 %/°C temperature coefficient - used for high-stability voltage reference in aerospace power regulation and precision analog instrumentation.

For engineers reviewing the 1N829A/TR datasheet, 1N829A/TR pinout, 1N829A/TR application, or 1N829A/TR equivalent, key selection criteria include low-impedance voltage reference stability over –65°C to +175°C, minimal thermal drift under varying load currents, and compatibility with MIL-PRF-19500/159 qualified surface-mount assembly processes.

Technical Context

This device implements a metallurgically bonded, double-plug zener structure optimized for low noise and tight voltage tolerance across extreme temperatures. Its temperature coefficient of ±0.0005 %/°C is achieved via internal compensation between two opposing zener junctions, enabling stable reference performance without external circuitry.

The DO-213AA MELF package provides hermetic glass sealing and axial coefficient of expansion (~6 ppm/°C) matched to common PCB substrates. It operates with cathode band positive and supports any mounting orientation while maintaining specified electrical behavior per JEDEC Std. No. 5.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	5.9–6.5 V @ I_ZT = 7.5 mA - defines nominal regulation range for precision reference design
Zener Impedance (Z_ZT)	5 Ω - ensures minimal output voltage variation under dynamic load changes
Temperature Coefficient	±0.0005 %/°C - guarantees sub-10 ppm/°C drift over full operating range
Power Dissipation	500 mW @ +50°C, derated 4 mW/°C above - sets thermal design margin for continuous operation
Operating Temperature	–65°C to +175°C - enables deployment in military, downhole, and avionics environments
Reverse Leakage	2 µA @ V_R = 3 V, 25°C - confirms low standby current in high-impedance bias networks

Pinout & Package

Package: DO-213AA (MELF), hermetically sealed glass case with tin/lead lead finish; axial symmetry allows bidirectional mounting; cathode identified by single black band.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Current sink terminal during reverse breakdown	Connected to system ground or lower-potential node in shunt regulator configuration
Cathode (banded end)	Current source terminal during reverse breakdown	Connected to regulated output node; polarity must be observed to avoid forward conduction

Key Features

Feature	Design Value
Temperature-compensated zener structure	Double-plug metallurgical construction cancels thermal drift without external components
Hermetic DO-213AA (MELF) package	Enables long-term reliability in humid, corrosive, or vacuum environments
MIL-PRF-19500/159 qualification path	Supports JAN/JANTX/JANTXV/JANS screening for defense and space-grade applications
Low zener impedance (5 Ω)	Minimizes AC ripple coupling into reference node in sensitive analog circuits

Applications

Aerospace Power Reference	Downhole Sensor Excitation
Use Scenario: Stable 6.2 V reference for ADC biasing and DAC feedback in satellite telemetry power management units. IC Role / Device Role / Timing Role: Shunt voltage reference providing primary regulation point for analog signal chain. Use Value: ±0.0005 %/°C TC ensures <±0.5 mV drift over –55°C to +125°C operational envelope.	Use Scenario: Excitation source for strain-gauge bridges in oil/gas well logging tools exposed to >150°C ambient. IC Role / Device Role / Timing Role: Precision voltage source for ratiometric sensor measurement systems. Use Value: Hermetic MELF package and –65°C to +175°C rating maintain calibration integrity under thermal shock.
Avionics Instrumentation	Military Radio Frequency Reference
Use Scenario: Calibration reference for cockpit display voltage monitors requiring traceable NIST-referenced stability. IC Role / Device Role / Timing Role: Primary voltage standard in self-test and diagnostic subsystems. Use Value: 5 Ω Z_ZT prevents loading-induced error when driving high-input-impedance comparators.	Use Scenario: Local oscillator tuning voltage stabilization in SDR transceivers operating across wide temperature ranges. IC Role / Device Role / Timing Role: Low-noise DC bias generator for varactor diodes and PLL charge pumps. Use Value: Sub-10 ppm/°C drift eliminates frequency drift in narrow-channel RF links.

Aerospace Power Reference

Downhole Sensor Excitation

Use Scenario: Stable 6.2 V reference for ADC biasing and DAC feedback in satellite telemetry power management units.

IC Role / Device Role / Timing Role: Shunt voltage reference providing primary regulation point for analog signal chain.

Use Value: ±0.0005 %/°C TC ensures <±0.5 mV drift over –55°C to +125°C operational envelope.

Use Scenario: Excitation source for strain-gauge bridges in oil/gas well logging tools exposed to >150°C ambient.

IC Role / Device Role / Timing Role: Precision voltage source for ratiometric sensor measurement systems.

Use Value: Hermetic MELF package and –65°C to +175°C rating maintain calibration integrity under thermal shock.

Avionics Instrumentation

Military Radio Frequency Reference

Use Scenario: Calibration reference for cockpit display voltage monitors requiring traceable NIST-referenced stability.

IC Role / Device Role / Timing Role: Primary voltage standard in self-test and diagnostic subsystems.

Use Value: 5 Ω Z_ZT prevents loading-induced error when driving high-input-impedance comparators.

Use Scenario: Local oscillator tuning voltage stabilization in SDR transceivers operating across wide temperature ranges.

IC Role / Device Role / Timing Role: Low-noise DC bias generator for varactor diodes and PLL charge pumps.

Use Value: Sub-10 ppm/°C drift eliminates frequency drift in narrow-channel RF links.

Equivalent & Alternatives

The following parts are listed as comparable options for similar zener reference applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N829UR-1	MIL-PRF-19500/159 screened version with identical electrical specs and DO-213AA package	Required for defense/aerospace programs mandating JAN/JANTXV-level testing and traceability	Select 1N829UR-1 when full military qualification and lot-level documentation are contractually required
CDLL829A	Same electrical specs and DO-213AA package; manufactured by CDI Diodes, not Central Semiconductor	No difference in circuit function or board-level integration; differs only in manufacturer branding and sourcing channel	Choose CDLL829A for dual-sourcing flexibility where Central Semiconductor allocation is constrained

Compared with 1N829A/TR, the 1N829UR-1 adds military screening without altering electrical behavior, while CDLL829A offers identical performance from an alternate qualified supplier - both preserve the same 5 Ω impedance, ±0.0005 %/°C TC, and DO-213AA mechanical interface critical for legacy avionics designs.

Availability

1N829A/TR is available at Aetrix Electronics and suitable for aerospace power regulation, downhole instrumentation, and avionics calibration requiring stable component supply across extended temperature and lifecycle requirements.

Supply support for 1N829A/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. is a U.S.-based manufacturer specializing in high-reliability discrete semiconductors for military, aerospace, and industrial applications.

The 1N829A/TR belongs to Central's MIL-qualified temperature-compensated zener diode family, engineered specifically for ultra-stable voltage references in mission-critical analog systems where long-term drift and thermal hysteresis must be minimized.

FAQ

What is the zener voltage tolerance of the 1N829A/TR?

The 1N829A/TR has a zener voltage range of 5.9 V to 6.5 V at 7.5 mA test current, representing a ±5.2% tolerance about the nominal 6.2 V point. This specification is guaranteed across the full operating temperature range and reflects the device's use as a precision reference rather than a general-purpose clamp.

Does the 1N829A/TR require heatsinking in typical applications?

No, the 1N829A/TR does not require external heatsinking under standard operating conditions. With a 500 mW power rating at +50°C and 4 mW/°C derating, it safely dissipates up to ~300 mW at +125°C ambient - sufficient for most shunt reference applications drawing ≤50 mA. Thermal design should verify junction temperature using the DO-213AA package's thermal resistance.

Is the 1N829A/TR compatible with reflow soldering processes?

Yes, the 1N829A/TR's DO-213AA glass package is rated for standard lead-free reflow profiles. Its hermetic seal and axial geometry support automated placement and IR/convection reflow, provided peak temperature does not exceed 260°C for more than 10 seconds and thermal ramp rates stay within JEDEC J-STD-020 limits.

How does the temperature coefficient of the 1N829A/TR compare to standard zeners?

The 1N829A/TR achieves ±0.0005 %/°C - over 10× tighter than typical 5.6 V zeners (±0.005 %/°C). This results from its double-plug compensated structure, making it suitable for applications where reference drift must remain below ±1 mV over –65°C to +175°C, unlike conventional zeners that exhibit parabolic TC curves.

Can the 1N829A/TR be used in series or parallel configurations?

The 1N829A/TR is designed for single-device shunt regulation and is not characterized for series or parallel operation. Parallel use risks current imbalance due to V_Z mismatch; series stacking alters effective TC and Z_ZT. For higher voltage or power, select a dedicated multi-junction reference or discrete resistor-zener network verified per application requirements.

1N829A/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):: 10 Ohms

Current - Reverse Leakage @ Vr:: 2 µA @ 3 V

Voltage - Forward (Vf) (Max) @ If:: -

Operating Temperature:: -65°C ~ 175°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-204AH (DO-35)

1N829A/TR FAQ

1.How can I place an order for 1N829A/TR through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N829A/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 1N829A/TR reliable?

The price and inventory of 1N829A/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N829A/TR is usually 5 days.

3.What payment methods are accepted for 1N829A/TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N829A/TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N829A/TR?

1N829A/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N829A/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 1N829A/TR?

For technical support, including 1N829A/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N829A/TR requirements.

6.How does Aetrix verify that 1N829A/TR is sourced from the original manufacturer or authorized distributors?

All 1N829A/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 1N829A/TR meets industry standards.

7.What is the process for return or replacement of 1N829A/TR?

All 1N829A/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N829A/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 1N829A/TR part is unused and in its original packaging.

Return procedure for 1N829A/TR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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