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Microchip Technology 1N4129-1
- Part No.:
- 1N4129-1
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N4129-1.pdf
- Description:
- DIODE ZENER 62V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:5,479
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Product details
Overview
1N4129-1 from Microsemi is a 500 mW, 62 V metallurgically bonded glass Zener diode in DO-35 (DO-204AH) axial package, qualified to JANS level per MIL-PRF-19500/435, with ±5% voltage tolerance, 500 Ω max dynamic impedance at 250 mA, and 0.01 µA max reverse leakage at 47.1 V. It delivers stable voltage regulation in high-reliability power supply reference and overvoltage protection circuits.
For engineers reviewing the 1N4129-1 datasheet, 1N4129-1 pinout, 1N4129-1 application, or 1N4129-1 equivalent, this page provides verified Zener voltage, thermal derating behavior, noise density (1 µV/√Hz), junction temperature range (–65°C to +175°C), and mil-spec qualification status - all critical for aerospace, defense, and industrial analog design.
Technical Context
The 1N4129-1 operates as a precision shunt regulator with a nominal Zener voltage of 62 V at 250 mA test current (IZT), exhibiting a positive temperature coefficient of +0.100 %/°C. Its metallurgical bond construction ensures low long-term drift and radiation hardness per MicroNote 050.
It features 500 Ω maximum dynamic impedance (ZZT) at IZT, 0.01 µA maximum reverse current (IR) at VR = 47.1 V, and minimal capacitance (~1.5 pF typical at 62 V), enabling stable regulation under varying load and temperature without oscillation in feedback loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 62 V at 250 mA - defines precise regulation point for reference and clamp circuits |
| Power Dissipation | 500 mW at 25 °C, linearly derated to zero at 175 °C - sets thermal layout requirements on PCB |
| Dynamic Impedance ZZT | 500 Ω max at 250 mA - determines output voltage stability under load transients |
| Reverse Leakage IR | 0.01 µA max at 47.1 V - ensures low standby current in high-impedance bias networks |
| Noise Density ND | 1 µV/√Hz - enables use in low-noise analog references without added filtering |
| Junction Temp Range | –65 °C to +175 °C - supports operation in extended-environment military and downhole systems |
| Temp Coefficient αVZ | +0.100 %/°C - allows predictable drift compensation in temperature-critical designs |
Pinout & Package
DO-35 (DO-204AH) hermetically sealed axial-glass package with cathode indicated by band; leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 method 2026. Weight ≈ 0.2 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground or low-side reference node | Connected to circuit common; reverse-biased operation requires cathode at higher potential |
| Cathode | Zener regulation output node | Banded end - must be held at voltage ≥62 V relative to anode to enter breakdown and regulate |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/435 qualification | Qualified to JANS level - meets screening, testing, and traceability requirements for space-grade applications |
| Metallurgical bond construction | Enables inherent radiation hardness and <100 ppm/1000 hrs long-term Zener voltage drift |
| Low noise density | 1 µV/√Hz at 62 V - eliminates need for external noise filtering in precision voltage references |
| Hermetic glass seal | Prevents moisture ingress and parameter shift over lifetime in humid or corrosive environments |
| Non-ESD-sensitive | Complies with MIL-STD-750 method 1020 - no special handling required during assembly |
Applications
| Avionics Power Reference | Defense System Overvoltage Clamp |
|---|---|
Use Scenario: Provides stable 62 V reference for ADC biasing and sensor excitation in flight control computers. IC Role / Device Role / Timing Role: Shunt voltage reference regulating supply rail against load and temperature variation. Use Value: Maintains ±0.5% reference accuracy across –55°C to +125°C due to JANS-level screening and +0.100 %/°C TC. |
Use Scenario: Clamps transient surges on 48 V DC distribution buses in radar subsystems. IC Role / Device Role / Timing Role: Fast-acting crowbar element absorbing >100 ms overvoltage events above 68 V. Use Value: Withstands 500 mW surge power and 0.01 µA leakage, minimizing false trips and standby loss. |
| Satellite Payload Bias Supply | Industrial PLC Analog Input Protection |
Use Scenario: Sets bias voltage for photodiode amplifiers in optical telemetry receivers. IC Role / Device Role / Timing Role: Low-noise Zener source feeding op-amp non-inverting input. Use Value: 1 µV/√Hz noise density prevents signal-to-noise degradation in sub-picoamp current measurement paths. |
Use Scenario: Protects 24 V analog input channels from field-wiring induced transients. IC Role / Device Role / Timing Role: Primary shunt clamp limiting input voltage to ≤68 V during fault conditions. Use Value: Hermetic DO-35 package ensures reliability in dusty, high-vibration factory environments over 15+ year service life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4129UR-1 | Same electrical specs, but in DO-213AA surface-mount package (no leads) | Required for automated SMT assembly; lacks axial mounting flexibility | Select when board space is constrained and reflow compatibility is mandatory |
| 1N4129-1e3 | Identical DO-35 package and Zener characteristics, but RoHS-compliant matte-tin plating (commercial grade only) | Not qualified to JANTXV/JANS; limited to commercial-temperature range (–55°C to +125°C) | Select for cost-sensitive industrial designs where mil-spec screening is unnecessary |
Compared with 1N4129UR-1 and 1N4129-1e3, the 1N4129-1 uniquely combines JANS-level reliability, axial-leaded mechanical robustness, and full military temperature range - making it irreplaceable in launch-critical avionics and nuclear instrumentation where lead integrity and radiation tolerance are non-negotiable.
Availability
1N4129-1 is available at Aetrix Electronics and suitable for avionics power reference, defense system overvoltage clamp, and satellite payload bias supply requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1N4129-1 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 RF components for aerospace, defense, and industrial markets.
The 1N4129-1 belongs to Microsemi's legacy MIL-PRF-19500-qualified Zener diode family, engineered for voltage regulation in mission-critical systems where parameter stability, radiation tolerance, and long-term reliability outweigh cost sensitivity.
FAQ
What is the Zener voltage tolerance for the 1N4129-1?
The 1N4129-1 has a standard ±5% Zener voltage tolerance at 25 °C, per JEDEC registration and MIL-PRF-19500/435 specification. This means its actual breakdown voltage falls between 58.9 V and 65.1 V when tested at 250 mA. Tighter tolerances (±2%, ±1%) are available under different suffixes (e.g., C or D), but not for the base 1N4129-1 part number.
Is the 1N4129-1 suitable for high-temperature operation?
Yes, the 1N4129-1 is rated for junction temperatures from –65 °C to +175 °C and is fully qualified to JANS level, making it suitable for high-temperature environments such as engine-mounted avionics or downhole oilfield electronics. Its power dissipation must be linearly derated above 50 °C ambient per Figure 2 in the datasheet.
Does the 1N4129-1 have radiation hardness certification?
Yes, the 1N4129-1 exhibits inherent radiation hardness due to its metallurgically bonded construction, as documented in Microsemi MicroNote 050. While not individually tested per MIL-STD-883, its process and structure are validated for total ionizing dose (TID) resilience in space and nuclear applications - a key reason for its JANS qualification.
What is the maximum reverse leakage current for the 1N4129-1?
The 1N4129-1 has a maximum reverse leakage current (IR) of 0.01 µA at VR = 47.1 V (76% of VZ), measured at 25 °C. This ultra-low leakage supports high-impedance bias networks and minimizes error in precision reference circuits where even nanoamp-level currents affect accuracy.
Can the 1N4129-1 be used in surface-mount designs?
No - the 1N4129-1 is packaged exclusively in the axial-leaded DO-35 (DO-204AH) glass case. For surface-mount equivalents, Microsemi offers the 1N4129UR-1 in DO-213AA package. The 1N4129-1 requires through-hole mounting and cannot be reflow-soldered without risk of glass fracture or hermeticity loss.
1N4129-1 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):
- 62 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 500 Ohms
- Current - Reverse Leakage @ Vr:
- 10 nA @ 47.1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
1N4129-1 FAQ
1.How can I place an order for 1N4129-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4129-1 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 1N4129-1 reliable?
The price and inventory of 1N4129-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4129-1 is usually 5 days.
3.What payment methods are accepted for 1N4129-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4129-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4129-1?
1N4129-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4129-1 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 1N4129-1?
For technical support, including 1N4129-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4129-1 requirements.
6.How does Aetrix verify that 1N4129-1 is sourced from the original manufacturer or authorized distributors?
All 1N4129-1 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 1N4129-1 meets industry standards.
7.What is the process for return or replacement of 1N4129-1?
All 1N4129-1 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4129-1, 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 1N4129-1 part is unused and in its original packaging.
Return procedure for 1N4129-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4129-1 Tags
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