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Microchip Technology 1N4125-1
- Part No.:
- 1N4125-1
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N4125-1.pdf
- Description:
- DIODE ZENER 47V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:2,660
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Product details
Overview
1N4125-1 from Microsemi is a 500 mW, 47 V metallurgically bonded glass Zener diode in DO-35 (DO-204AH) axial-leaded package, qualified to JANTXV level per MIL-PRF-19500/435, with ±5% voltage tolerance, 250 mA Zener test current, and 250 Ω maximum dynamic impedance at 25 °C. It delivers stable voltage regulation in high-reliability power supply reference and overvoltage protection circuits.
For engineers reviewing the 1N4125-1 datasheet, 1N4125-1 pinout, 1N4125-1 application, or 1N4125-1 equivalent, this page provides verified electrical parameters, thermal derating behavior, noise density (1 µV/√Hz), temperature coefficient (+0.095 %/°C), and military-grade qualification details essential for aerospace, defense, and industrial embedded designs.
Technical Context
The 1N4125-1 operates as a precision shunt voltage regulator with a nominal Zener voltage of 47 V at 250 mA test current, exhibiting low noise density (1 µV/√Hz) and a positive temperature coefficient of +0.095 %/°C - typical for Zeners above 40 V. Its metallurgical bond construction ensures mechanical robustness and long-term stability under thermal cycling.
It is rated for 500 mW average power dissipation at 25 °C, linearly derated to zero at 175 °C junction temperature, with thermal resistance junction-to-lead of 250 °C/W at 10 mm lead length. Reverse leakage is limited to ≤0.01 µA at 35.8 V, supporting low-power biasing and sensing applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 47 V at 250 mA - defines precise regulation point for feedback loops and reference generation |
| Power Dissipation (PM(AV)) | 500 mW at 25 °C - sets maximum continuous DC power handling before thermal derating begins |
| Dynamic Impedance (ZZT) | 250 Ω max at 250 mA - determines regulation sensitivity to load current changes |
| Reverse Leakage (IR) | ≤0.01 µA at 35.8 V - enables ultra-low standby current in precision bias networks |
| Noise Density (ND) | 1 µV/√Hz - supports low-noise analog references in instrumentation and ADC front-ends |
| Temp. Coefficient (αVZ) | +0.095 %/°C - quantifies voltage drift over temperature for stability-critical designs |
| Junction Temp. Range | –65 to +175 °C - validates operation in extended environmental conditions including space-grade thermal cycles |
Pinout & Package
Package: DO-35 (DO-204AH), hermetically sealed axial-leaded glass case with cathode band marking. Leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to system ground or lower-potential rail; forms return path for Zener current |
| Cathode | Regulated output node | Banded end; supplies stable 47 V when reverse-biased; must be held at higher potential than anode |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgical bond construction | Ensures mechanical integrity and long-term parameter stability under vibration and thermal stress |
| JANTXV qualification per MIL-PRF-19500/435 | Validates reliability for high-assurance systems including avionics and satellite subsystems |
| Low noise density (1 µV/√Hz) | Minimizes voltage reference jitter in precision analog signal chains and sensor excitation |
| Hermetic glass DO-35 package | Provides moisture and contaminant immunity for mission-critical environments |
| Non-ESD-sensitive per MIL-STD-750 method 1020 | Eliminates need for ESD handling controls during assembly and field maintenance |
Applications
| Avionics Power Reference | Satellite Bus Voltage Monitor |
|---|---|
Use Scenario: Providing stable 47 V reference for analog-to-digital converters monitoring primary bus voltage in flight control computers. IC Role / Device Role / Timing Role: Shunt voltage reference element in a discrete feedback network for isolated DC-DC converter regulation. Use Value: Maintains ±0.5% regulation across –55 to +125 °C ambient with <1 µV/√Hz noise, meeting DO-160E Section 22 radiated emissions requirements. | Use Scenario: Monitoring 48 V spacecraft bus voltage via resistive divider into radiation-hardened comparator. IC Role / Device Role / Timing Role: Precision Zener clamp ensuring consistent threshold detection despite solar array voltage fluctuations. Use Value: JANTXV qualification and inherent radiation hardness enable >100 krad(Si) TID tolerance without derating, per MicroNote 050. |
| Ground-Based Radar Bias Supply | Tactical Radio RF Amplifier Protection |
Use Scenario: Generating clean 47 V bias for GaAs FET preamplifiers in L-band radar receivers. IC Role / Device Role / Timing Role: Low-noise voltage reference in active bias network for gain-stable RF amplification. Use Value: 1 µV/√Hz noise density prevents phase noise degradation in local oscillator synthesis paths. | Use Scenario: Overvoltage clamping on 48 V DC input rails of handheld radios exposed to automotive battery transients. IC Role / Device Role / Timing Role: Transient voltage suppressor protecting downstream PMICs and baseband ICs. Use Value: 500 mW power rating and 250 Ω ZZT allow safe absorption of ISO 7637-2 Pulse 5a surges without latch-up or parametric shift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4752A | 47 V, ±5%, 1 W, DO-41 package; higher power but non-military qualified | Lacks MIL-PRF-19500/435 qualification and metallurgical bond; unsuitable for space or avionics | Select only for commercial-grade 47 V reference where cost and availability outweigh reliability requirements |
| SMF47A | 47 V, ±5%, 400 mW, SOD-123FL surface-mount package; RoHS-compliant, no military grade | Surface-mount form factor and lower power rating limit use in high-temp through-hole assemblies | Prefer for compact PCB layouts where reflow compatibility and board space are prioritized over hermeticity and radiation tolerance |
Compared with 1N4125-1, the 1N4752A offers higher power but lacks military qualification and low-noise performance, while the SMF47A trades hermetic sealing and radiation hardness for surface-mount convenience and RoHS compliance - neither is pin-compatible nor drop-in replaceable.
Availability
1N4125-1 is available at Aetrix Electronics and suitable for avionics power reference, satellite bus voltage monitor, and ground-based radar bias supply requiring stable component supply, full traceability, and long-lifecycle support.
Supply support for 1N4125-1 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 military-qualified analog and mixed-signal components.
The 1N4125-1 belongs to Microsemi's legacy 1N4099–1N4135 Zener diode family, engineered for precision voltage regulation in mission-critical aerospace, defense, and industrial systems where parameter stability and environmental resilience are mandatory.
FAQ
What is the Zener voltage tolerance for the 1N4125-1?
The 1N4125-1 has a nominal Zener voltage of 47 V with a standard tolerance of ±5%, as defined by JEDEC registration and confirmed in the Electrical Characteristics table on page 3 of T4-LDS-0245-2 Rev. 1. This tolerance applies at 250 mA test current and 25 °C ambient temperature, and is consistent across JAN, JANTX, JANTXV, and JANS reliability levels.
Is the 1N4125-1 RoHS compliant?
The 1N4125-1 is available in RoHS-compliant versions marked with the "e3" suffix (e.g., 1N4125-1e3), but only for commercial-grade units. Military-grade variants (JAN/JANTX/JANTXV/JANS) retain tin-lead plating and are not RoHS compliant, per Microsemi's nomenclature guide and packaging documentation.
What is the maximum reverse leakage current for the 1N4125-1?
The 1N4125-1 exhibits a maximum reverse leakage current (IR) of 0.01 µA at 35.8 V, as specified in the Electrical Characteristics table. This ultra-low leakage supports high-impedance bias networks and precision voltage divider applications where minimal current draw is critical.
Does the 1N4125-1 require heatsinking in standard operation?
No, the 1N4125-1 does not require external heatsinking at ambient temperatures ≤50 °C and power dissipation ≤500 mW. Its thermal resistance junction-to-lead is 250 °C/W at 10 mm lead length, and derating begins linearly above 50 °C lead temperature - standard axial mounting on FR4 with 4 mm² copper pads suffices for full-rated operation.
What is the noise density specification for the 1N4125-1?
The 1N4125-1 has a maximum noise density of 1 µV/√Hz, measured at 1 kHz–3 kHz bandwidth with 250 mA Zener test current and 25 °C ambient, per Figure 1 and note on page 4 of T4-LDS-0245-2 Rev. 1. This value is consistent with other Zeners ≥43 V in the series and enables low-jitter reference design.
1N4125-1 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):
- 47 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 250 Ohms
- Current - Reverse Leakage @ Vr:
- 10 nA @ 35.8 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)
1N4125-1 FAQ
1.How can I place an order for 1N4125-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4125-1 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 1N4125-1 reliable?
The price and inventory of 1N4125-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4125-1 is usually 5 days.
3.What payment methods are accepted for 1N4125-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4125-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4125-1?
1N4125-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4125-1 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 1N4125-1?
For technical support, including 1N4125-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4125-1 requirements.
6.How does Aetrix verify that 1N4125-1 is sourced from the original manufacturer or authorized distributors?
All 1N4125-1 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 1N4125-1 meets industry standards.
7.What is the process for return or replacement of 1N4125-1?
All 1N4125-1 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4125-1, 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 1N4125-1 part is unused and in its original packaging.
Return procedure for 1N4125-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4125-1 Tags
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