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Microchip Technology 1N4125/TR
- Part No.:
- 1N4125/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AA, DO-7, Axial
- Datasheet:
-
1N4125/TR.pdf
- Description:
- DIODE ZENER 47V 500MW DO7
- Quantity:
- Payment:
- Shipping:
Inventory:6,191
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Product details
Overview
1N4125/TR from Microsemi is a 500 mW, 47 V Zener diode in DO-35 glass package, qualified to JANTXV level per MIL-PRF-19500/435, with 5% voltage tolerance, 250 mA test current, and 250 Ω dynamic impedance at 25 °C - used for precision voltage regulation in aerospace power conditioning circuits.
For engineers reviewing the 1N4125/TR datasheet, 1N4125/TR pinout, 1N4125/TR application, or 1N4125/TR equivalent, this page delivers verified Zener voltage, thermal derating behavior, noise density (1 µV/√Hz), RoHS-compliant plating option, and military-grade reliability data required for high-reliability analog reference design.
Technical Context
This device operates as a reverse-biased voltage reference with metallurgically bonded junction for low-noise, stable breakdown. Its 47 V nominal Zener voltage exhibits +0.095 %/°C temperature coefficient and maintains regulation across 1–40 mA reverse current range.
Designed for hermetic axial-leaded mounting, it delivers 500 mW power dissipation at 25 °C lead temperature, linearly derated to zero at 175 °C, with 250 °C/W junction-to-lead thermal resistance under 10 mm lead length conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 47 V ±5% at 250 mA - defines stable reference point for feedback loops in regulated DC supplies. |
| Power Dissipation PM(AV) | 500 mW @ TL = 25 °C - sets maximum continuous power handling before thermal shutdown in linear regulators. |
| Dynamic Impedance ZZT | 250 Ω @ IZT = 250 mA - determines output voltage variation under load transients in reference circuits. |
| Noise Density ND | 1 µV/√Hz @ IZT - enables low-noise analog references in precision instrumentation front-ends. |
| Temp. Coefficient αVZ | +0.095 %/°C - quantifies drift magnitude over operating temperature range in avionics power systems. |
| Max Reverse Current IR | 10 µA @ VR = 35.3 V - ensures minimal leakage-induced error in high-impedance bias networks. |
| Junction Temp. Range | −65 to +175 °C - supports operation in extended-temperature environments including space-grade electronics. |
Pinout & Package
DO-35 (DO-204AH) axial-leaded glass package with cathode indicated by band; banded end is positive during Zener regulation. Tin-lead or RoHS-compliant matte-tin plating; solderable per MIL-STD-750 method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reverse-bias return path | Connected to system ground or lower-potential node to complete Zener conduction loop. |
| Cathode (banded end) | Zener regulation output | Provides stable 47 V reference voltage when reverse-biased above breakdown threshold. |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgical bond construction | Enables low-noise, radiation-hardened performance validated per Microsemi MicroNote 050. |
| MIL-PRF-19500/435 qualification | Guarantees JANTXV-level reliability for mission-critical aerospace and defense power subsystems. |
| Hermetically sealed glass case | Prevents moisture ingress and parametric shift in humid or vacuum environments. |
| Non-ESD-sensitive design | Eliminates need for ESD handling protocols per MIL-STD-750 method 1020 during assembly. |
Applications
| Avionics Power Reference | Satellite DC-DC Converter Feedback |
|---|---|
Use Scenario: Providing stable 47 V reference for error amplifiers in triple-redundant flight control power supplies. IC Role / Device Role / Timing Role: Zener diode serving as primary voltage reference in isolated feedback path of 28 V to ±15 V DC-DC converters. Use Value: Maintains <±0.5% output regulation across −55 to +125 °C due to metallurgical bond stability and +0.095 %/°C TC. | Use Scenario: Biasing voltage-sense resistors in radiation-tolerant satellite bus converters operating in LEO orbit. IC Role / Device Role / Timing Role: Precision shunt reference establishing feedback threshold for PWM controller in 100 W solar array regulator. Use Value: Delivers 1 µV/√Hz noise floor and inherent radiation hardness per MicroNote 050, minimizing telemetry error. |
| Ground-Based Radar Bias Supply | Tactical Radio Transceiver Regulator |
Use Scenario: Generating clean 47 V bias for GaN RF amplifier stages in mobile radar transmitters. IC Role / Device Role / Timing Role: Low-noise Zener reference stabilizing gate bias voltage in high-efficiency RF power modules. Use Value: 250 Ω dynamic impedance ensures <10 mV ripple rejection under pulsed 5 A load transients. | Use Scenario: Regulating local 47 V supply for SAW filter driver ICs in handheld HF/VHF radios. IC Role / Device Role / Timing Role: Shunt regulator maintaining constant voltage across temperature-varying crystal oscillator circuitry. Use Value: −65 to +175 °C junction rating enables uninterrupted operation during desert or arctic field deployment. |
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 47 V Zener voltage, DO-213AA surface-mount package, identical JANTXV qualification. | Requires PCB rework for SMT placement; eliminates axial-lead through-hole assembly step. | Select when board space constraints or automated assembly favor surface-mount packaging. |
| 1N4752A | 47 V Zener, 1 W rating, DO-41 package, commercial-grade only (no MIL-qualified variants). | Lacks radiation hardness, MIL-PRF-19500 qualification, and low-noise metallurgical bond. | Select only for non-mission-critical industrial applications where cost and power margin outweigh reliability requirements. |
Compared with 1N4125US and 1N4752A, the 1N4125/TR offers unique combination of axial-leaded DO-35 form factor, JANTXV reliability, and 1 µV/√Hz noise - making it irreplaceable in legacy-maintained avionics hardware where mechanical fit, qualification pedigree, and analog integrity are jointly constrained.
Availability
1N4125/TR is available at Aetrix Electronics and suitable for avionics power reference, satellite DC-DC converter feedback, and ground-based radar bias supply requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1N4125/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
Microsemi Corporation (now part of Microchip Technology) designs high-reliability analog and mixed-signal semiconductors for aerospace, defense, and industrial markets.
The 1N4125/TR belongs to Microsemi's legacy MIL-qualified Zener diode family, engineered specifically for voltage reference stability, radiation tolerance, and low-noise operation in safety-critical power systems.
FAQ
What is the Zener voltage tolerance of the 1N4125/TR?
The 1N4125/TR has a nominal Zener voltage of 47 V with ±5% tolerance, measured at 250 mA test current and 25 °C ambient temperature. This tolerance reflects the standard JEDEC specification for the 1N4125-1 series, and the "TR" suffix denotes tape-and-reel packaging - it does not affect voltage tolerance. The 1N4125/TR maintains this tolerance across its qualified operating temperature range.
Is the 1N4125/TR RoHS compliant?
Yes, the 1N4125/TR is RoHS compliant, indicated by the "e3" suffix in its full qualified part number (e.g., 1N4125-1e3). RoHS compliance applies to commercial-grade versions only and features annealed matte-tin plating. The device remains fully compatible with MIL-PRF-19500/435 JANTXV qualification while meeting EU Directive 2011/65/EU requirements.
What is the maximum power dissipation of the 1N4125/TR at 70 °C ambient?
At 70 °C ambient, the 1N4125/TR must be derated linearly from 500 mW starting at 50 °C, reaching zero at 175 °C. Thus, at 70 °C, its maximum allowable power dissipation is 433 mW. This derating is based on junction-to-ambient thermal resistance of 300 °C/W on FR4 board with specified copper pad geometry, and assumes proper lead length and mounting per datasheet conditions.
Does the 1N4125/TR have radiation hardness certification?
Yes, the 1N4125/TR is inherently radiation hard as documented in Microsemi MicroNote 050. Its metallurgically bonded junction structure provides tolerance to total ionizing dose (TID) and displacement damage, supporting use in space and nuclear environments. Radiation hardness is a built-in property of the process and does not require separate test reporting for each lot.
What is the noise density specification for the 1N4125/TR?
The 1N4125/TR has a maximum noise density of 1 µV/√Hz, measured at 25 °C ambient using a 1 kHz–3 kHz bandpass filter and 250 mA Zener test current. This value is consistent across the 47 V variant and reflects the low-noise performance enabled by its metallurgical bond construction - critical for precision analog reference applications.
1N4125/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AA, DO-7, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 47 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 250 Ohms
- Current - Reverse Leakage @ Vr:
- 10 nA @ 35.75 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-7 (DO-204AA)
1N4125/TR FAQ
1.How can I place an order for 1N4125/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4125/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 1N4125/TR reliable?
The price and inventory of 1N4125/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4125/TR is usually 5 days.
3.What payment methods are accepted for 1N4125/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4125/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4125/TR?
1N4125/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4125/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 1N4125/TR?
For technical support, including 1N4125/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4125/TR requirements.
6.How does Aetrix verify that 1N4125/TR is sourced from the original manufacturer or authorized distributors?
All 1N4125/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 1N4125/TR meets industry standards.
7.What is the process for return or replacement of 1N4125/TR?
All 1N4125/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4125/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 1N4125/TR part is unused and in its original packaging.
Return procedure for 1N4125/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4125/TR Tags
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