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Microchip Technology 1N4625UR-1
- Part No.:
- 1N4625UR-1
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N4625UR-1.pdf
- Description:
- DIODE ZENER 5.1V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,998
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Product details
Overview
1N4625UR-1 from Microsemi is a 500 mW surface-mount Zener diode in DO-213AA (MELF) glass package, rated for 5.1 V ±5% regulation at 250 mA test current, with 1500 Ω dynamic impedance, 3.0 µA max reverse leakage at 3.8 V, and -0.045/+0.030 %/°C temperature coefficient. It serves as a precision voltage reference in high-reliability analog power-supply feedback and sensor biasing circuits.
For engineers reviewing the 1N4625UR-1 datasheet, 1N4625UR-1 pinout, 1N4625UR-1 application, or 1N4625UR-1 equivalent, this part supports stable low-noise regulation in aerospace, defense, and industrial systems requiring MIL-PRF-19500/435 qualification up to JANS level, hermetic MELF packaging, and minimal capacitance.
Technical Context
The 1N4625UR-1 operates in reverse-bias breakdown mode with a nominal Zener voltage of 5.1 V at 250 mA, exhibiting 1500 Ω dynamic impedance (ZZT) and 3.0 µV/√Hz noise density at IZT. Its metallurgically bonded construction ensures mechanical robustness and thermal stability across -65 °C to +175 °C junction temperature range.
It delivers regulated output under varying load and temperature conditions, with linear power derating from 500 mW at 25 °C to zero at 175 °C on FR4 PCB, and features cathode band polarity marking for unambiguous orientation during automated placement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 5.1 V ±5% at 250 mA - sets precise reference point for feedback loops and voltage clamping |
| Power Dissipation | 500 mW - supports continuous regulation in compact surface-mount layouts without forced cooling |
| Dynamic Impedance (ZZT) | 1500 Ω - determines regulation sensitivity to current variation; lower values improve line/load regulation |
| Reverse Leakage (IR) | 3.0 µA max at 3.8 V - ensures minimal error current in high-impedance reference nodes |
| Noise Density | 3.0 µV/√Hz - enables low-noise operation in precision analog signal chains and sensor excitation |
| Temp. Coefficient (αVZ) | -0.045/+0.030 %/°C - defines voltage drift over temperature; critical for wide-range environmental operation |
| Junction Temp. Range | -65 °C to +175 °C - qualifies for extreme-environment applications including space-grade and downhole electronics |
Pinout & Package
DO-213AA (SOD-80 / CDLL34) MELF glass package: hermetically sealed, cylindrical surface-mount form factor with axial symmetry and cathode band marking. Tin-lead or RoHS-compliant matte-tin plating; solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or low-impedance return path; establishes reference node for regulation |
| Cathode | Zener regulation terminal / voltage output node | Banded end; connected to regulated voltage rail; must be held positive relative to anode for breakdown operation |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/435 qualification | Available in JAN, JANTX, JANTXV, and JANS reliability levels - meets stringent screening for aerospace and defense systems |
| Metallurgical bond construction | Eliminates wire bonds and interfacial delamination risk - enhances long-term reliability under thermal cycling and vibration |
| Low noise density | 3.0 µV/√Hz at 5.1 V - reduces RMS noise contribution in precision ADC references and op-amp bias networks |
| Hermetic glass MELF package | DO-213AA case - provides moisture immunity and stable parametric performance over lifetime vs. plastic SMD packages |
| ESD insensitivity | Non-sensitive per MIL-STD-750 Method 1020 - eliminates need for handling precautions during assembly and test |
Applications
| Avionics Power Monitoring | Industrial Sensor Biasing |
|---|---|
Use Scenario: Regulating reference voltage for analog-to-digital converters in flight control system power monitors. IC Role / Device Role / Timing Role: Zener diode providing stable 5.1 V reference for ADC input scaling and fault detection thresholds. Use Value: Maintains <±0.5% reference accuracy over -55 °C to +125 °C ambient, enabling reliable voltage margin checking in real-time. | Use Scenario: Supplying excitation voltage to bridge-based pressure transducers in oil & gas downhole tools. IC Role / Device Role / Timing Role: Precision voltage source for Wheatstone bridge biasing, minimizing offset drift in harsh thermal environments. Use Value: Delivers <3 µV/√Hz noise and <1500 Ω dynamic impedance, preserving signal-to-noise ratio in microvolt-level bridge outputs. |
| Military Radio RF Stage Bias | Satellite Payload Voltage Clamping |
Use Scenario: Setting gate bias for GaAs FET amplifiers in secure tactical radios operating across extended temperature ranges. IC Role / Device Role / Timing Role: Low-drift Zener regulating bias voltage for RF amplifier stages to maintain gain stability. Use Value: Temperature coefficient of -0.045/+0.030 %/°C ensures <±20 mV shift over -40 °C to +85 °C, preventing gain compression. | Use Scenario: Clamping transient overvoltage on 5 V power rails in satellite attitude control subsystems exposed to radiation-induced spikes. IC Role / Device Role / Timing Role: Transient voltage suppressor leveraging Zener breakdown to limit rail excursion during single-event transients. Use Value: Inherently radiation-hardened per MicroNote 050 and qualified to JANS level - survives total ionizing dose >100 krad(Si). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CDLL4625-1 | Commercial-grade version with same 5.1 V rating, 250 mA IZT, and DO-213AA package; RoHS-compliant option available (e3 suffix) | Lacks MIL-PRF-19500/435 qualification; not screened for JAN/JANTXV/JANS levels | Select when cost-sensitive commercial designs require identical electrical specs without military screening. |
| 1N4625TR | Tape-and-reel variant of 1N4625UR-1 (same die, same spec); differs only in packaging format (EIA-481-1-A, 12 mm tape) | No functional or electrical difference; intended for automated SMT placement rather than bulk or tube delivery | Select when high-volume pick-and-place manufacturing requires standard reel packaging. |
Compared with CDLL4625-1 and 1N4625TR, the 1N4625UR-1 uniquely combines full military qualification (up to JANS), hermetic glass packaging, and metallurgical bonding-making it the only choice for radiation-tolerant, high-reliability programs where long-term parameter stability under thermal stress is non-negotiable.
Availability
1N4625UR-1 is available at Aetrix Electronics and suitable for avionics power monitoring, industrial sensor biasing, military radio RF stage bias, and satellite payload voltage clamping requiring stable component supply across extended temperature and radiation environments.
Supply support for 1N4625UR-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, mixed-signal, and radiation-hardened components for aerospace, defense, and industrial markets.
The 1N4625UR-1 belongs to Microsemi's legacy MIL-qualified Zener diode family designed specifically for precision voltage regulation in mission-critical systems where parameter stability, hermeticity, and qualification pedigree outweigh cost or size constraints.
FAQ
What is the Zener voltage tolerance for 1N4625UR-1?
The 1N4625UR-1 has a nominal Zener voltage of 5.1 V with a standard tolerance of ±5%, as defined by JEDEC specification and confirmed in the Electrical Characteristics table on page 4 of T4-LDS-0245 Rev. 2. This tolerance applies at 250 mA test current and 25 °C ambient temperature.
Is 1N4625UR-1 RoHS compliant?
The 1N4625UR-1 is not RoHS compliant by default; RoHS compliance (e3 suffix) is available only on commercial-grade variants like CDLL4625-1e3. The UR-1 suffix denotes military-grade construction with tin-lead plating, consistent with MIL-PRF-19500/435 requirements.
What package type does 1N4625UR-1 use?
The 1N4625UR-1 uses the DO-213AA (also known as SOD-80 or CDLL34) MELF-style hermetically sealed glass package. Dimensions are specified on page 6 of T4-LDS-0245 Rev. 2, with body diameter 1.60–1.70 mm and length 3.30–3.71 mm.
Does 1N4625UR-1 have radiation hardness certification?
Yes, the 1N4625UR-1 is inherently radiation hard as documented in Microsemi MicroNote 050. Its metallurgically bonded, hermetic glass construction and JANS qualification confirm suitability for total ionizing dose (TID) environments exceeding 100 krad(Si), making it appropriate for satellite and space applications.
What is the maximum reverse leakage current for 1N4625UR-1?
The maximum reverse leakage current (IR) for 1N4625UR-1 is 3.0 µA at 3.8 V reverse voltage, per the Electrical Characteristics table on page 4 of T4-LDS-0245 Rev. 2. This value is measured at 25 °C and reflects worst-case leakage before breakdown onset.
1N4625UR-1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AA
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 5.1 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 1500 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 3 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-213AA
1N4625UR-1 FAQ
1.How can I place an order for 1N4625UR-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4625UR-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 1N4625UR-1 reliable?
The price and inventory of 1N4625UR-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4625UR-1 is usually 5 days.
3.What payment methods are accepted for 1N4625UR-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4625UR-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4625UR-1?
1N4625UR-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4625UR-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 1N4625UR-1?
For technical support, including 1N4625UR-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4625UR-1 requirements.
6.How does Aetrix verify that 1N4625UR-1 is sourced from the original manufacturer or authorized distributors?
All 1N4625UR-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 1N4625UR-1 meets industry standards.
7.What is the process for return or replacement of 1N4625UR-1?
All 1N4625UR-1 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4625UR-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 1N4625UR-1 part is unused and in its original packaging.
Return procedure for 1N4625UR-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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