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Microchip Technology 1N4620-1
- Part No.:
- 1N4620-1
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AA, DO-7, Axial
- Datasheet:
-
1N4620-1.pdf
- Description:
- DIODE ZENER 3.3V 500MW DO7
- Quantity:
- Payment:
- Shipping:
Inventory:2,068
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Product details
Overview
1N4620-1 from Microsemi is a 500 mW, 3.3 V ±5% metallurgically bonded glass Zener diode in DO-35 (DO-204AH) axial package, qualified to JANTXV level per MIL-PRF-19500/435. It delivers stable voltage regulation at 250 mA test current with 1650 Ω dynamic impedance and 3.5 µA reverse leakage at 1.5 V, suited for precision biasing in military-grade power supplies.
For engineers reviewing the 1N4620-1 datasheet, 1N4620-1 pinout, 1N4620-1 application, or 1N4620-1 equivalent, this page provides verified Zener voltage, noise density, temperature coefficient, derating behavior, and mil-spec qualification details critical for high-reliability analog reference design.
Technical Context
This device operates as a two-terminal shunt voltage regulator with cathode-banded polarity, requiring reverse-bias connection where the banded end is positive. Its metallurgical bond construction ensures low noise (1 µV/√Hz typical at 3.3 V), minimal capacitance, and inherent radiation hardness per MicroNote 050.
It exhibits a negative temperature coefficient of –0.075 %/°C and linear power derating from 500 mW at 25 °C to zero at 175 °C on standard FR4 board layout. Thermal resistance junction-to-lead is 250 °C/W at 10 mm lead length.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 3.3 V ±5% at 250 mA - defines nominal regulation point with tight tolerance for reference stability |
| Power Dissipation | 500 mW @ 25 °C - sets maximum continuous DC power handling before thermal shutdown |
| Dynamic Impedance ZZT | 1650 Ω @ 250 mA - indicates regulation stiffness; lower values improve load regulation |
| Reverse Leakage IR | 3.5 µA @ 1.5 V - quantifies off-state current affecting low-power standby accuracy |
| Noise Density | 1 µV/√Hz @ 250 mA - enables low-noise analog references in precision instrumentation |
| Temp Coefficient αVZ | –0.075 %/°C - predicts voltage drift over temperature; negative sign indicates decreasing VZ with heating |
| Thermal Resistance RθJL | 250 °C/W @ 10 mm lead - determines junction temperature rise under load for reliability margining |
Pinout & Package
Hermetically sealed axial-leaded DO-35 (DO-204AH) glass package with tin-lead or RoHS-compliant matte-tin plating. Cathode identified by single black band; operated with banded end positive in reverse-bias configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground-reference terminal | Connected to system ground or lowest potential node in shunt regulator topology |
| Cathode | Regulated output terminal | Banded end; supplies stable 3.3 V when reverse-biased above breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgical bond construction | Enables low-noise operation (1 µV/√Hz) and radiation hardness without epoxy-induced degradation |
| MIL-PRF-19500/435 qualification | Validated reliability up to JANTXV level for aerospace, defense, and downhole electronics |
| Hermetic glass sealing | Prevents moisture ingress and parameter shift over 20+ year field life in harsh environments |
| Negative tempco (–0.075 %/°C) | Compensates for positive tempcos in associated circuitry to stabilize overall reference drift |
Applications
| Low-Noise Instrumentation Reference | Military Power Supply Regulation |
|---|---|
Use Scenario: Precision analog front-end in portable spectrum analyzers requiring sub-microvolt noise floor. IC Role / Device Role / Timing Role: Shunt voltage reference providing 3.3 V bias to op-amp input stages and ADC drivers. Use Value: 1 µV/√Hz noise density directly limits system noise floor, enabling <100 nV RMS broadband measurement capability. | Use Scenario: Voltage clamping in 28 V aircraft power distribution modules operating across –55 °C to +125 °C. IC Role / Device Role / Timing Role: Overvoltage protection element absorbing transient energy while maintaining regulated rail integrity. Use Value: JANTXV qualification and –65 °C to +175 °C operating range ensure uninterrupted function during extreme thermal cycling. |
| Satellite Payload Biasing | Downhole Sensor Excitation |
Use Scenario: Stable excitation source for radiation-hardened MEMS accelerometers in LEO satellite attitude control systems. IC Role / Device Role / Timing Role: Primary voltage reference for sensor bridge excitation and signal conditioning ASICs. Use Value: Inherent radiation hardness per MicroNote 050 eliminates need for shielding or derating in total ionizing dose >100 krad(Si) environments. | Use Scenario: Calibration reference in high-temperature (175 °C) pressure transducers deployed in oil/gas wellbores. IC Role / Device Role / Timing Role: Temperature-stable Zener element compensating for sensor offset drift via matched tempco networks. Use Value: –0.075 %/°C tempco allows precise cancellation of silicon sensor drift, reducing calibration frequency by 3×. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4620UR-1 | Same electrical specs; surface-mount DO-213AA package instead of axial DO-35 | Requires SMT reflow process; eliminates through-hole assembly but reduces mechanical robustness in vibration-prone mounts | Select when board space is constrained and automated assembly is prioritized over field-serviceability |
| 1N4728A | 3.3 V ±5%, 1 W rating, 1000 Ω ZZT, no mil-spec qualification, commercial-only RoHS | Lacks radiation hardness, JANTXV validation, and hermetic seal; unsuitable for aerospace or nuclear environments | Select only for cost-sensitive industrial controls where extended temperature and reliability are not required |
Compared with 1N4620UR-1 and 1N4728A, the 1N4620-1 uniquely combines mil-qualified reliability, hermetic glass packaging, and ultra-low noise-making it irreplaceable in radiation-exposed, thermally cycled, or long-life mission-critical systems where failure is not an option.
Availability
1N4620-1 is available at Aetrix Electronics and suitable for military avionics power sequencing, downhole sensor calibration, and satellite payload biasing requiring stable component supply across extended temperature ranges and multi-decade service life.
Supply support for 1N4620-1 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) designs high-reliability analog and mixed-signal semiconductors for aerospace, defense, and industrial markets.
The 1N4620-1 belongs to Microsemi's legacy MIL-PRF-19500/435-qualified Zener diode family, engineered specifically for voltage reference stability under extreme thermal, radiation, and mechanical stress.
FAQ
What is the Zener voltage tolerance for 1N4620-1?
The 1N4620-1 has a nominal Zener voltage of 3.3 V with a standard tolerance of ±5%, as defined in the 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.
Is 1N4620-1 qualified to JANS level?
No, the 1N4620-1 is qualified to JAN, JANTX, and JANTXV levels per MIL-PRF-19500/435, but JANS qualification requires additional screening and is not specified for this part number in the documentation. JANS-level variants would carry distinct part-number suffixes and separate qualification reports.
What is the maximum reverse leakage current for 1N4620-1?
The maximum reverse leakage current (IR) for 1N4620-1 is 3.5 µA measured at 1.5 V reverse voltage, as stated in the Electrical Characteristics table. This value reflects worst-case leakage under specified test conditions and supports low-power standby design.
Does 1N4620-1 have RoHS compliance?
Yes, RoHS-compliant versions of 1N4620-1 are available with the "e3" suffix (e.g., 1N4620-1e3), but only for commercial-grade units. Mil-spec versions (JAN/JANTX/JANTXV) retain tin-lead plating and are exempt from RoHS requirements per defense procurement standards.
What is the thermal resistance junction-to-ambient for 1N4620-1?
The thermal resistance junction-to-ambient (RθJA) for 1N4620-1 is 300 °C/W under standard FR4 PCB mounting conditions (1 oz Cu, 4 mm² pads, 1 mm track width, 25 mm length), as specified in the Maximum Ratings table. This value guides heatsinking decisions for sustained power operation.
1N4620-1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AA, DO-7, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 3.3 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 1650 Ohms
- Current - Reverse Leakage @ Vr:
- 3.5 µA @ 1.5 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
1N4620-1 FAQ
1.How can I place an order for 1N4620-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4620-1 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 1N4620-1 reliable?
The price and inventory of 1N4620-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4620-1 is usually 5 days.
3.What payment methods are accepted for 1N4620-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4620-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4620-1?
1N4620-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4620-1 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 1N4620-1?
For technical support, including 1N4620-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4620-1 requirements.
6.How does Aetrix verify that 1N4620-1 is sourced from the original manufacturer or authorized distributors?
All 1N4620-1 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 1N4620-1 meets industry standards.
7.What is the process for return or replacement of 1N4620-1?
All 1N4620-1 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4620-1, 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 1N4620-1 part is unused and in its original packaging.
Return procedure for 1N4620-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4620-1 Tags
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