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Microchip Technology 1N4129
- Part No.:
- 1N4129
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N4129.pdf
- Description:
- DIODE ZENER 62V 400MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,807
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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 package, qualified to JANS level per MIL-PRF-19500/435, with 1% voltage tolerance, 500 Ω maximum dynamic impedance at 250 mA, and 6.1 mA maximum Zener current for precision voltage regulation in high-reliability aerospace and defense power supplies.
For engineers reviewing the 1N4129-1 datasheet, 1N4129-1 pinout, 1N4129-1 application, or 1N4129-1 equivalent, this page delivers verified electrical parameters, military-grade qualification status, thermal derating behavior, noise density (1 µV/√Hz), and DO-35 mechanical dimensions - all critical for radiation-hardened analog reference design and legacy system sustainment.
Technical Context
The 1N4129-1 operates as a two-terminal voltage reference diode, conducting in reverse breakdown with a nominal Zener voltage of 62.0 V at 250 mA test current (IZT). Its metallurgical bond construction ensures stable regulation across -65 °C to +175 °C junction temperature range and inherent radiation hardness per MicroNote 050.
It exhibits a positive temperature coefficient of +0.100 %/°C and maximum reverse leakage of 10 nA at 47.1 V (VR), with dynamic impedance measured at 500 Ω using 25 µA rms AC signal superimposed on IZT - confirming low-noise performance suitable for precision analog biasing and calibration circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 62.0 V at 250 mA - defines stable regulation point for high-voltage reference rails |
| Power Dissipation | 500 mW at 25 °C - requires linear derating above 50 °C ambient for sustained operation |
| Dynamic Impedance (ZZT) | 500 Ω max at 250 mA - limits output voltage variation under load transients |
| Reverse Leakage (IR) | 10 nA max at 47.1 V - ensures minimal error current in high-impedance reference nodes |
| Noise Density (ND) | 1 µV/√Hz - enables low-noise analog sensing and metrology-grade references |
| Temp Coefficient (αVZ) | +0.100 %/°C - supports predictable drift compensation in wide-temperature environments |
| Junction Temp Range | -65 °C to +175 °C - certified for extreme-environment avionics and space-qualified systems |
Pinout & Package
DO-35 (DO-204AH) axial-leaded hermetically sealed glass package; cathode indicated by single band; tin-lead or RoHS-compliant matte-tin plating; weight ≈ 0.2 g; body diameter 1.42–2.29 mm, length 3.56–5.08 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node during Zener operation; carries full Zener current when reverse-biased |
| Cathode (banded end) | Zener regulation terminal | Connected to higher-potential node; maintains 62.0 V reference relative to anode under reverse bias |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/435 qualification | JANS-level reliability certification confirms suitability for flight-critical and nuclear-hardened systems |
| Metallurgical bond construction | Eliminates interfacial delamination risk under thermal cycling and mechanical shock |
| 1% Zener voltage tolerance | Reduces need for external trimming in precision reference designs |
| Low noise density (1 µV/√Hz) | Minimizes voltage reference uncertainty in high-resolution ADC/DAC bias networks |
| Radiation hardness | Inherent TID tolerance per MicroNote 050 supports operation in low-earth orbit and reactor environments |
Applications
| Avionics Power Reference | Spacecraft Voltage Monitor |
|---|---|
Use Scenario: Stable 62 V reference for analog-to-digital conversion in flight control sensor interfaces. IC Role / Device Role / Timing Role: Zener diode providing primary voltage reference for isolated DC-DC converter feedback and telemetry conditioning. Use Value: JANS qualification and -65 °C to +175 °C operation ensure uninterrupted reference stability during launch vibration and orbital thermal cycling. | Use Scenario: High-voltage rail monitoring in satellite power distribution units. IC Role / Device Role / Timing Role: Precision shunt regulator establishing known threshold for overvoltage protection circuitry. Use Value: Radiation hardness and 1 µV/√Hz noise enable reliable fault detection without false triggers in long-duration missions. |
| Nuclear Instrumentation | Defense Radar Bias Supply |
Use Scenario: Calibration reference in gamma-ray spectrometry front-end amplifiers. IC Role / Device Role / Timing Role: Low-drift voltage reference for charge-sensitive preamplifier biasing and gain stabilization. Use Value: +0.100 %/°C tempco and 1% tolerance allow accurate energy binning across reactor coolant temperature swings. | Use Scenario: High-stability bias source for GaN RF power amplifier gate control. IC Role / Device Role / Timing Role: Shunt-regulated 62 V supply maintaining constant gate voltage under pulsed RF load. Use Value: 500 mW rating and 500 Ω dynamic impedance prevent gate voltage droop during microsecond-scale transmit bursts. |
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; DO-213AA surface-mount package instead of DO-35 axial lead | Requires PCB re-layout; eliminates through-hole assembly but reduces thermal resistance to ambient | Select for space-constrained SMT designs where manual rework or wave soldering is not required |
| 1N4129-1 (JANTXV) | Identical DO-35 package and 62 V Zener spec; qualified to JANTXV level (not JANS) with reduced screening rigor | Suitable for non-flight-critical subsystems where full JANS testing cost is unjustified | Select for ground-support equipment or radar test benches needing high reliability without space qualification overhead |
Compared with 1N4129UR-1 and 1N4129-1 (JANTXV), the 1N4129-1 offers the highest assurance of performance in mission-critical environments due to its JANS qualification, while retaining identical electrical behavior and DO-35 mechanical compatibility with legacy military hardware.
Availability
1N4129-1 is available at Aetrix Electronics and suitable for avionics power reference, spacecraft voltage monitor, and nuclear instrumentation requiring stable component supply with guaranteed long-term obsolescence management.
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, radiation-hardened, and aerospace-grade components.
The 1N4129-1 belongs to Microsemi's legacy MIL-PRF-19500/435 qualified Zener diode family, designed specifically for precision voltage regulation in defense, space, and nuclear instrumentation systems where parametric stability under extreme stress is mandatory.
FAQ
What is the Zener voltage tolerance for the 1N4129-1?
The 1N4129-1 has a nominal Zener voltage of 62.0 V with ±1% tolerance, corresponding to the "D" suffix in Microsemi's nomenclature. This tight tolerance is achieved via post-trimming and screening, enabling direct use in precision reference circuits without external calibration.
Is the 1N4129-1 RoHS compliant?
The 1N4129-1 is available in both RoHS-compliant (e3 suffix) and non-RoHS versions. RoHS compliance applies only to commercial-grade units; military-grade variants (JAN/JANTX/JANTXV/JANS) retain tin-lead plating per MIL-STD-750 method 2026 for solderability and reliability.
What is the maximum Zener current (IZM) for the 1N4129-1?
The 1N4129-1 has a maximum Zener current (IZM) of 6.1 mA at 25 °C ambient, derived from its 500 mW power rating and 62.0 V Zener voltage. At elevated temperatures, IZM must be reduced linearly per the derating curve in Figure 2 of the datasheet.
Does the 1N4129-1 require heatsinking in standard PCB mounting?
No heatsink is required for the 1N4129-1 under typical conditions: its thermal resistance junction-to-ambient is 300 °C/W on FR4 with 4 mm² copper pads. Full 500 mW dissipation is only possible below 50 °C ambient; above that, power must be linearly derated to zero at 175 °C.
How does the 1N4129-1 compare to the 1N4128-1 in terms of temperature coefficient?
Both 1N4129-1 and 1N4128-1 share the same +0.100 %/°C temperature coefficient. This consistent positive tempco across the 60–75 V range simplifies multi-rail reference design and enables predictable drift compensation using matched resistor networks.
1N4129 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AA
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 62 V
- Tolerance:
- ±5%
- Power - Max:
- 400 mW
- Impedance (Max) (Zzt):
- 500 Ohms
- Current - Reverse Leakage @ Vr:
- 10 nA @ 47.1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1 V @ 200 mA
- Operating Temperature:
- -65°C ~ 200°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-213AA
1N4129 FAQ
1.How can I place an order for 1N4129 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4129 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 reliable?
The price and inventory of 1N4129 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4129 is usually 5 days.
3.What payment methods are accepted for 1N4129?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4129 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4129?
1N4129 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4129 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?
For technical support, including 1N4129 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4129 requirements.
6.How does Aetrix verify that 1N4129 is sourced from the original manufacturer or authorized distributors?
All 1N4129 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 meets industry standards.
7.What is the process for return or replacement of 1N4129?
All 1N4129 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4129, 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 part is unused and in its original packaging.
Return procedure for 1N4129:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4129 Tags
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