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

Microchip Technology 1N829A

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

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Part No.:: 1N829A

Manufacturer:: Microchip Technology

Category:: Single Zener Diodes

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

Datasheet:: 1N829A.pdf

Description:: DIODE ZENER 6.2V 500MW DO204AH

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Product details

Overview

1N829A from Microsemi is a temperature-compensated Zener reference diode in DO-35 (DO-204AH) glass axial-leaded package, delivering 6.2 V nominal Zener voltage at 7.5 mA with ±5% tolerance, 10 Ω maximum Zener impedance, 5 µA maximum reverse leakage at 3 V, and ultra-low 0.0005 %/°C temperature coefficient over –55°C to +100°C. It serves as a precision voltage reference in high-stability analog instrumentation circuits.

For engineers reviewing the 1N829A datasheet, 1N829A pinout, 1N829A application, or 1N829A equivalent, key selection criteria include its hermetically sealed DO-35 construction, military-grade temperature stability, low capacitance (<100 pF), metallurgical bond option (-1 suffix), and compliance with MIL-PRF-19500/159 when ordered with JAN/JANTX/JANTXV prefixes.

Technical Context

The 1N829A implements a temperature-compensated Zener structure optimized for minimal ∆VZ across –55°C to +100°C, achieving a maximum voltage drift of only 5 mV over that range. Its 0.0005 %/°C effective temperature coefficient is realized through internal compensation design, not external circuitry.

It operates at a fixed test current of 7.5 mA for specified electrical parameters, with DC power dissipation rated at 500 mW at 25°C lead temperature but optimized for <50 mW operation at 7.5 mA. The device is polarity-sensitive: cathode band must be biased negative relative to anode for proper Zener conduction.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	5.9–6.5 V at I_ZT = 7.5 mA; center nominal 6.15 V supports tight-tolerance variants (e.g., 1N829A-1-1%)
Temperature Coefficient (αV_Z)	0.0005 %/°C max; enables sub-mV drift over industrial/military temperature ranges without external compensation
Zener Impedance (Z_ZT)	10 Ω max at 7.5 mA dc + 0.75 mA ac rms; ensures stable regulation under small-signal load variations
Reverse Leakage (I_R)	5 µA max at 3 V; minimizes error current in high-impedance reference nodes
Operating Temperature Range	–65°C to +175°C; qualified for extended-range aerospace and downhole applications
Package	DO-35 (DO-204AH) hermetically sealed glass; axial-leaded, tin-lead plated, MIL-STD-750 compliant
Power Dissipation	500 mW at T_L = 25°C; derates linearly above 25°C; optimal regulation at ≤50 mW (7.5 mA)

Pinout & Package

DO-35 (DO-204AH) hermetically sealed glass axial-leaded package with cathode band marking. Leads are tin-lead plated and solderable per MIL-STD-750 Method 2026. Polarity: banded end is cathode (must be biased negative relative to anode for Zener operation).

Pin/Terminal	Circuit Role	Design Meaning
Anode	Reference node ground connection	Connected to circuit common; establishes reference potential baseline
Cathode (banded end)	Zener output terminal	Provides stable 6.2 V reference voltage when reverse-biased; must be held positive relative to anode

Key Features

Feature	Design Value
Ultra-low temperature coefficient	0.0005 %/°C max enables <5 mV total ∆V_Z from –55°C to +100°C without trimming
Hermetic DO-35 glass package	Ensures long-term parameter stability and moisture resistance in harsh environments
Internal metallurgical bond option	Available with "-1" suffix (e.g., 1N829A-1); improves thermal transient response and mechanical reliability
MIL-PRF-19500/159 qualification path	Supports JANTX/JANTXV versions (e.g., JANTX1N829A-1); meets screening and reliability requirements for defense systems
Low junction capacitance	≤100 pF typical; minimizes noise coupling and high-frequency loading in precision analog stages

Applications

High-Accuracy Instrumentation	Aerospace Power Monitoring
Use Scenario: Precision multimeters and calibration standards requiring sub-10 ppm/°C reference stability over wide ambient ranges. IC Role / Device Role / Timing Role: Primary voltage reference for 24-bit delta-sigma ADC biasing and DAC output scaling. Use Value: 0.0005 %/°C TC and 5 mV max ∆V_Z over –55°C to +100°C eliminate need for external temperature compensation circuitry.	Use Scenario: Onboard voltage monitoring in satellite power distribution units operating from –65°C to +125°C. IC Role / Device Role / Timing Role: Reference element in radiation-hardened shunt regulators and telemetry sensor excitation circuits. Use Value: Hermetic DO-35 package and –65°C to +175°C rating ensure reliability in vacuum and thermal cycling environments.
Military Avionics Reference	Downhole Oilfield Sensors
Use Scenario: Analog front-end references in JANTXV-qualified flight control computers where MIL-PRF-19500 compliance is mandatory. IC Role / Device Role / Timing Role: Stable bias source for op-amp input stages and precision current sources in servo loop feedback paths. Use Value: JANTXV1N829A-1 variant provides full military screening, including burn-in and lot acceptance testing per MIL-STD-883.	Use Scenario: Pressure and temperature transducer signal conditioning in geothermal drilling tools exposed to >150°C ambient. IC Role / Device Role / Timing Role: Reference diode in high-temperature Wheatstone bridge excitation and ratiometric ADC interfaces. Use Value: Verified operation up to +175°C storage and +125°C continuous operation supports extended downhole deployment without derating.

High-Accuracy Instrumentation

Aerospace Power Monitoring

Use Scenario: Precision multimeters and calibration standards requiring sub-10 ppm/°C reference stability over wide ambient ranges.

IC Role / Device Role / Timing Role: Primary voltage reference for 24-bit delta-sigma ADC biasing and DAC output scaling.

Use Value: 0.0005 %/°C TC and 5 mV max ∆V_Z over –55°C to +100°C eliminate need for external temperature compensation circuitry.

Use Scenario: Onboard voltage monitoring in satellite power distribution units operating from –65°C to +125°C.

IC Role / Device Role / Timing Role: Reference element in radiation-hardened shunt regulators and telemetry sensor excitation circuits.

Use Value: Hermetic DO-35 package and –65°C to +175°C rating ensure reliability in vacuum and thermal cycling environments.

Military Avionics Reference

Downhole Oilfield Sensors

Use Scenario: Analog front-end references in JANTXV-qualified flight control computers where MIL-PRF-19500 compliance is mandatory.

IC Role / Device Role / Timing Role: Stable bias source for op-amp input stages and precision current sources in servo loop feedback paths.

Use Value: JANTXV1N829A-1 variant provides full military screening, including burn-in and lot acceptance testing per MIL-STD-883.

Use Scenario: Pressure and temperature transducer signal conditioning in geothermal drilling tools exposed to >150°C ambient.

IC Role / Device Role / Timing Role: Reference diode in high-temperature Wheatstone bridge excitation and ratiometric ADC interfaces.

Use Value: Verified operation up to +175°C storage and +125°C continuous operation supports extended downhole deployment without derating.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N829-1	Same 6.2 V nominal, same 0.0005 %/°C TC, but lacks 'A' grade tighter initial tolerance; standard 1N829 has wider V_Z spread (5.9–6.5 V) vs. 1N829A's tighter binning	Suitable for non-critical references where ±5% V_Z is acceptable; lacks A-grade consistency for metrology-grade designs	Select 1N829A when repeatable 6.15 V center-nominal performance and A-grade screening are required
LM399H	Buried-Zener IC with 6.95 V output, 0.3 ppm/°C TC, on-chip heater; requires 10 mA supply, 200 mW dissipation, and external capacitors	Used in laboratory-grade DMMs and atomic clocks; not drop-in-requires PCB redesign, thermal management, and bias circuitry	Choose LM399H only when sub-ppm stability justifies added complexity and cost; 1N829A remains optimal for simple, low-power, discrete reference needs

Compared with 1N829-1 and LM399H, the 1N829A delivers the best balance of ultra-low TC, DO-35 simplicity, and A-grade voltage consistency-enabling high-stability references without active circuitry, external compensation, or layout changes.

Availability

1N829A is available at Aetrix Electronics and suitable for high-reliability instrumentation, aerospace power monitoring, and military avionics applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 1N829A 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 1N821–1N829A series was designed specifically to deliver JEDEC-registered, temperature-compensated Zener references meeting MIL-PRF-19500/159 requirements in hermetic axial packages for mission-critical analog subsystems.

FAQ

What is the nominal Zener voltage and tolerance of the 1N829A?

The 1N829A 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, corresponding to ±5% tolerance. Its 'A' suffix denotes tighter binning within this range compared to standard 1N829, improving unit-to-unit consistency for precision applications.

Does the 1N829A require external temperature compensation?

No, the 1N829A does not require external temperature compensation. Its internal temperature-compensated Zener structure achieves a maximum effective temperature coefficient of 0.0005 %/°C, limiting total voltage change to just 5 mV over –55°C to +100°C - sufficient for most high-stability analog references without additional circuitry.

What is the significance of the "-1" suffix in variants like 1N829A-1?

The "-1" suffix indicates internal metallurgical bonding of the die to the lead frame, which improves thermal response time, mechanical robustness, and long-term parameter stability. This construction is required for MIL-PRF-19500/159 qualification and is available in both commercial and military-grade versions of the 1N829A.

Can the 1N829A be used in surface-mount designs?

No, the 1N829A is exclusively offered in the axial-leaded DO-35 (DO-204AH) through-hole package. For surface-mount equivalents, Microsemi offers military-qualified DO-213AA variants such as JANTX1N829UR-1, which require separate part numbering and are not pin-compatible with the 1N829A.

What is the maximum reverse leakage current for the 1N829A at 3 V?

The maximum reverse leakage current (I_R) for the 1N829A is 5 µA at 3 V, measured at 25°C. This low leakage ensures minimal error current in high-impedance reference networks and contributes to stable biasing in precision op-amp and ADC circuits using the 1N829A.

1N829A 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:: -65°C ~ 175°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

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

1N829A FAQ

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

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

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

3.What payment methods are accepted for 1N829A?

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

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N829A?

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

Once your 1N829A 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?

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

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

All 1N829A 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 meets industry standards.

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

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

Return procedure for 1N829A:

1.Submit a request within 90 days.

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

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