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Microchip Technology 1N4125
- Part No.:
- 1N4125
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
1N4125.pdf
- Description:
- DIODE ZENER
- Quantity:
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- Shipping:
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Product details
Overview
1N4125 from Microsemi is a 500 mW, 47 V metallurgically bonded glass Zener diode in DO-35 package, qualified to JANS level per MIL-PRF-19500/435. It delivers ±5% Zener voltage tolerance at 250 mA test current, exhibits 250 Ω dynamic impedance, and supports stable voltage regulation across -65°C to +175°C junction temperature range in aerospace power supply reference circuits.
For engineers reviewing the 1N4125 datasheet, 1N4125 pinout, 1N4125 application, or 1N4125 equivalent, key selection criteria include its 47 V nominal Zener voltage, 250 mA test current, 250 Ω dynamic impedance at IZT, 0.01 µA maximum reverse leakage at 35.8 V, and JANS-level radiation-hardened reliability for high-reliability analog reference design.
Technical Context
This Zener diode operates in reverse breakdown with cathode band indicating polarity, requiring banded end to be positive relative to anode for regulation. Its metallurgical bond ensures low noise density (1 µV/√Hz typical at lower voltages) and minimal capacitance, critical for precision reference stability.
Thermal resistance is 250°C/W junction-to-lead (at 10 mm lead length) and 300°C/W junction-to-ambient on FR4 board. Power derating begins linearly at 50°C ambient, reaching zero dissipation at 175°C - enabling operation in extended-temperature military avionics environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 47 V ±5% at 250 mA - defines precise DC reference point for feedback loops in regulated power supplies. |
| Power Dissipation | 500 mW at 25°C - sets maximum continuous thermal load before derating; usable up to 175°C with linear reduction. |
| Dynamic Impedance ZZT | 250 Ω at 250 mA - determines output voltage variation under load changes; lower values improve regulation accuracy. |
| Reverse Leakage IR | 0.01 µA max at 35.8 V - ensures negligible current draw in standby, preserving low-power system integrity. |
| Junction Temp Range | -65°C to +175°C - enables deployment in space-grade and missile guidance electronics without thermal derating penalties. |
| Noise Density | 1 µV/√Hz (typical, <6.8 V) - minimizes voltage reference jitter in precision ADC reference buffers and sensor signal chains. |
| Temp Coefficient αVZ | +0.095 %/°C - quantifies drift rate; used to calculate worst-case reference error over operating temperature span. |
Pinout & Package
DO-35 (DO-204AH) axial-leaded hermetically sealed glass package with tin-lead or RoHS-compliant matte-tin plating. Cathode indicated by single black band; banded end must be biased positive for Zener operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to circuit common; establishes return path for Zener current and defines 0 V reference plane. |
| Cathode | Regulated output node | Banded end supplies stable 47 V output; requires series resistor to limit IZ and manage power dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgical bond construction | Eliminates interfacial voids and delamination risk, ensuring long-term parameter stability under thermal cycling and vibration. |
| JANS qualification per MIL-PRF-19500/435 | Validated for spaceflight and nuclear-hardened systems via lot acceptance testing, burn-in, and radiation exposure protocols. |
| Low noise density (1 µV/√Hz) | Enables use in ultra-low-noise analog references where spectral purity affects ADC ENOB or PLL phase noise. |
| Hermetic glass sealing | Prevents moisture ingress and ionic contamination, maintaining Zener voltage accuracy over 20+ year field life in harsh environments. |
| Non-ESD-sensitive per MIL-STD-750 | Withstands handling without special grounding protocols - reduces assembly line failure rates and eliminates ESD protection overhead. |
Applications
| Avionics Power Reference | Satellite Bus Voltage Monitor |
|---|---|
Use Scenario: Providing primary voltage reference for triple-redundant DC-DC converter feedback in flight control power modules. IC Role / Device Role / Timing Role: Zener diode acting as passive shunt regulator establishing 47 V reference for error amplifier input. Use Value: JANS qualification and -65°C to +175°C operation ensure uninterrupted reference stability during rapid atmospheric re-entry thermal transients. | Use Scenario: Monitoring main bus voltage (42–50 V) in LEO satellite power distribution units with fault logging. IC Role / Device Role / Timing Role: Precision shunt element in comparator-based overvoltage detection circuit with hysteresis. Use Value: 0.01 µA reverse leakage prevents false triggering during low-current sleep modes; radiation hardness avoids latch-up in Van Allen belt passes. |
| Military Radar Bias Supply | Nuclear Instrumentation Channel |
Use Scenario: Generating stable bias voltage for GaN RF amplifier gate drivers in ground-based radar transmitters. IC Role / Device Role / Timing Role: Zener clamp regulating gate drive rail to prevent device overvoltage during fast switching transients. Use Value: 250 Ω dynamic impedance limits voltage sag under 100 ns pulse loads; DO-35 mechanical robustness withstands shock/vibration in mobile radar platforms. | Use Scenario: Calibrating high-voltage detector channels (40–50 V range) in reactor neutron flux monitoring systems. IC Role / Device Role / Timing Role: Primary reference standard traceable to NIST via factory calibration data included with JANS lots. Use Value: +0.095 %/°C tempco allows accurate drift compensation over coolant temperature swings; hermetic seal prevents outgassing-induced calibration drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4125US | Same electrical specs; surface-mount DO-213AA package instead of axial DO-35. | Requires SMT reflow process; unsuitable for through-hole prototyping or manual repair. | Select when board space constraints or automated assembly demand surface-mount form factor. |
| 1N4125-1 | Identical specifications and DO-35 packaging; "-1" suffix denotes JAN/JANTXV qualification level (vs. JANS for 1N4125). | Lacks full JANS radiation hardness validation; not approved for Class S space applications. | Select for cost-sensitive defense programs where JANTXV suffices and full JANS testing is unnecessary. |
Compared with 1N4125US and 1N4125-1, the 1N4125 provides the highest reliability tier (JANS), making it mandatory for mission-critical space electronics where single-event burnout immunity and lot traceability are non-negotiable.
Availability
1N4125 is available at Aetrix Electronics and suitable for avionics power reference, satellite bus voltage monitor, and military radar bias supply applications requiring stable component supply across extended temperature ranges and radiation-exposed environments.
Supply support for 1N4125 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) designs high-reliability semiconductors for aerospace, defense, and industrial markets, emphasizing radiation tolerance and long-life performance.
The 1N4125 belongs to Microsemi's MIL-PRF-19500/435-qualified Zener diode family, engineered specifically for precision voltage reference in safety-critical systems where parameter stability under extreme environmental stress is paramount.
FAQ
What is the Zener voltage tolerance for the 1N4125?
The 1N4125 has a nominal Zener voltage of 47 V with a ±5% tolerance at 250 mA test current, as specified in the Microsemi T4-LDS-0245-2 datasheet. This tolerance applies under standard test conditions at 25°C ambient temperature and reflects the initial calibration spread across production lots.
Is the 1N4125 suitable for space applications?
Yes, the 1N4125 is qualified to JANS level per MIL-PRF-19500/435, including radiation hardness assurance per Microsemi MicroNote 050. Its hermetic DO-35 package and metallurgical bond make it suitable for low-earth orbit and deep-space missions where total ionizing dose and single-event effects must be mitigated.
What is the maximum reverse leakage current for the 1N4125?
The 1N4125 specifies a maximum reverse leakage current (IR) of 0.01 µA at 35.8 V, measured at 25°C. This ultra-low leakage supports energy-efficient standby operation in battery-backed instrumentation and ensures minimal loading on high-impedance reference nodes.
Does the 1N4125 require external heat sinking?
No, the 1N4125 does not require external heat sinking under typical operating conditions. With a junction-to-lead thermal resistance of 250°C/W and 500 mW rating, it dissipates heat adequately through axial leads when mounted per MIL-STD-750 guidelines - provided ambient temperature remains below 50°C before derating begins.
How is polarity marked on the 1N4125?
The 1N4125 uses a single black cathode band on the glass body to indicate polarity. For proper Zener regulation, the banded end must be connected to the more positive potential in the circuit - i.e., the cathode is the regulated output terminal, and the unbanded end is the anode/reference ground.
1N4125 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- -
- Tolerance:
- -
- Power - Max:
- -
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- -
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
1N4125 FAQ
1.How can I place an order for 1N4125 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4125 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 1N4125 reliable?
The price and inventory of 1N4125 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4125 is usually 5 days.
3.What payment methods are accepted for 1N4125?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4125 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4125?
1N4125 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4125 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 1N4125?
For technical support, including 1N4125 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4125 requirements.
6.How does Aetrix verify that 1N4125 is sourced from the original manufacturer or authorized distributors?
All 1N4125 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 1N4125 meets industry standards.
7.What is the process for return or replacement of 1N4125?
All 1N4125 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4125, 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 1N4125 part is unused and in its original packaging.
Return procedure for 1N4125:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4125 Tags
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