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Microchip Technology 1N4621UR/TR
- Part No.:
- 1N4621UR/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N4621UR/TR.pdf
- Description:
- DIODE ZENER 3.6V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,818
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Product details
Overview
1N4621UR/TR from Microsemi is a 500 mW surface-mount Zener diode in DO-213AA (MELF) package, rated for 3.6 V nominal Zener voltage at 250 mA test current, with ±5% tolerance, 1700 Ω dynamic impedance, and -0.065 %/°C temperature coefficient. It delivers stable voltage regulation in high-reliability power supply and reference circuits across military and industrial environments.
For engineers reviewing the 1N4621UR/TR datasheet, 1N4621UR/TR pinout, 1N4621UR/TR application, or 1N4621UR/TR equivalent, key selection criteria include Zener voltage accuracy, low noise density (2.0 µV/√Hz), hermetic glass packaging, MIL-PRF-19500/435 qualification level, and thermal resistance of 100 °C/W junction-to-end-cap.
Technical Context
This device operates as a reverse-biased voltage reference, maintaining regulation over wide current (250 mA IZT, up to 83 mA IZM) and temperature (-65 to +175 °C) ranges. Its metallurgically bonded construction ensures mechanical robustness and long-term stability under thermal cycling.
The DO-213AA glass MELF package provides hermetic sealing, minimal capacitance (typical <2 pF per Figure 3), and ESD insensitivity per MIL-STD-750 Method 1020. Noise density is specified at 2.0 µV/√Hz - significantly lower than higher-voltage variants - supporting precision analog references.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.6 V at 250 mA - defines precise regulation point for low-voltage reference design |
| Power Dissipation | 500 mW - supports continuous operation at ambient ≤25 °C before linear derating begins |
| Dynamic Impedance (ZZT) | 1700 Ω - indicates moderate AC impedance affecting regulation stiffness under varying load |
| Temperature Coefficient (αVZ) | -0.065 %/°C - enables predictable drift compensation in temperature-stable references |
| Noise Density (ND) | 2.0 µV/√Hz - critical for low-noise analog signal chains and precision ADC/DAC references |
| Reverse Leakage (IR) | 3.5 µA at 3.5 V - ensures minimal quiescent current in standby or battery-powered circuits |
| Junction Temp Range | -65 to +175 °C - qualified for extended-range aerospace, downhole, and defense applications |
Pinout & Package
DO-213AA (SOD-80 / CDLL34) glass MELF package: hermetically sealed, cylindrical, axial-symmetric, cathode marked by single band. Tin-lead or RoHS-compliant matte-tin plating; solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to circuit ground or lower-potential node during Zener operation |
| Cathode | Banded end | Connected to regulated output node; must be held positive relative to anode for breakdown conduction |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic Glass MELF Construction | Enables operation in harsh environments (humidity, radiation, thermal shock) without performance degradation |
| MIL-PRF-19500/435 Qualification | Available in JAN/JANTX/JANTXV/JANS screening levels - verified reliability for mission-critical systems |
| Low Noise Density | 2.0 µV/√Hz at 3.6 V - supports high-resolution analog measurement and sensor excitation circuits |
| Metallurgical Bonding | Eliminates wire bonds and interfacial delamination risk - improves long-term parameter stability |
| ESD Insensitivity | Non-sensitive per MIL-STD-750 Method 1020 - simplifies handling and eliminates need for ESD protection circuitry |
Applications
| Avionics Power Reference | Satellite DC-DC Monitor |
|---|---|
Use Scenario: Regulating bias voltage for analog front-end amplifiers in flight control computers. IC Role / Device Role / Timing Role: Precision voltage reference for ADC input scaling and op-amp offset trimming. Use Value: -0.065 %/°C tempco and 2.0 µV/√Hz noise ensure <±0.5% full-scale error over -55 to +125 °C operating range. |
Use Scenario: Providing stable reference for isolated feedback loops in radiation-hardened DC-DC converters. IC Role / Device Role / Timing Role: Zener shunt regulator in secondary-side sensing network. Use Value: Hermetic DO-213AA package and JANS qualification guarantee >100 krad(Si) TID tolerance and zero parametric shift after proton irradiation. |
| Downhole Sensor Interface | Industrial PLC Analog Input |
Use Scenario: Biasing piezoresistive pressure transducers in oil/gas wellhead monitoring systems. IC Role / Device Role / Timing Role: Low-drift voltage reference for Wheatstone bridge excitation. Use Value: Stable 3.6 V output maintains bridge sensitivity within ±0.1% over -40 to +175 °C, enabled by metallurgical bonding and wide TJ range. |
Use Scenario: Calibrating 4–20 mA loop receivers in factory automation controllers. IC Role / Device Role / Timing Role: Shunt reference for DAC output buffering and current sink calibration. Use Value: 1700 Ω ZZT and 3.5 µA IR allow accurate 12-bit linearity verification without external op-amp loading effects. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CDLL4621-1 | Commercial-grade version; same 3.6 V VZ, 250 mA IZT, and DO-213AA package but no MIL screening. | Lacks JAN/JANTXV/JANS qualification; not suitable for defense/aerospace deployments requiring traceable reliability data. | Select when cost-sensitive industrial designs require identical electrical specs without military certification. |
| 1N4621UR-1 | Same die and package as 1N4621UR/TR, but supplied in bulk or ammo pack - no tape-and-reel packaging. | No EIA-481-1-A compliant reel; incompatible with high-speed SMT pick-and-place lines requiring TR format. | Choose only for manual assembly, prototyping, or low-volume production where reel feeding is unnecessary. |
Compared with CDLL4621-1 and 1N4621UR-1, the 1N4621UR/TR uniquely combines full MIL-PRF-19500/435 qualification with EIA-481-compliant tape-and-reel delivery - enabling direct integration into certified high-reliability manufacturing lines without requalification or packaging adaptation.
Availability
1N4621UR/TR is available at Aetrix Electronics and suitable for avionics power reference, satellite DC-DC monitor, and downhole sensor interface applications requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for 1N4621UR/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) is a U.S.-based semiconductor company specializing in high-reliability analog and mixed-signal components for aerospace, defense, and industrial markets.
The 1N4621UR/TR belongs to Microsemi's legacy MIL-qualified Zener diode family, engineered for voltage regulation in extreme-environment systems where parameter stability, radiation hardness, and hermetic integrity are non-negotiable.
FAQ
What is the Zener voltage tolerance for 1N4621UR/TR?
The 1N4621UR/TR has a nominal Zener voltage of 3.6 V with a standard tolerance of ±5%, as defined by JEDEC for the 1N46xx series. This tolerance applies at 250 mA test current and 25 °C ambient, with thermal equilibrium established at the end-cap terminations per datasheet Note 2.
Is 1N4621UR/TR RoHS compliant?
The 1N4621UR/TR is not RoHS compliant by default; RoHS compliance (e3 suffix) is available only on commercial-grade variants like CDLL4621-1. The "UR" suffix denotes the metallurgically bonded surface-mount version qualified to MIL-PRF-19500/435, which retains tin-lead plating per military specification.
What does the "TR" suffix mean in 1N4621UR/TR?
The "TR" suffix in 1N4621UR/TR indicates tape-and-reel packaging per EIA-481-1-A standard using 12 mm carrier tape. This format enables automated SMT placement and is required for high-volume production; bulk or ammo-pack versions omit this suffix.
How does the noise performance of 1N4621UR/TR compare to higher-voltage Zeners in the same family?
The 1N4621UR/TR exhibits 2.0 µV/√Hz noise density at 3.6 V - significantly lower than 6.8 V+ devices (e.g., 40 µV/√Hz at 6.8 V). This reflects the inverse relationship between Zener voltage and noise in low-voltage avalanche-regulated diodes, making 1N4621UR/TR optimal for ultra-low-noise sub-5 V references.
Can 1N4621UR/TR replace 1N4621UR-1 in existing designs?
Yes - the 1N4621UR/TR shares identical electrical specifications, DO-213AA package dimensions, and metallurgical construction with 1N4621UR-1. The only difference is packaging format: "TR" adds EIA-481-compliant tape-and-reel, while "-1" denotes the base part number used across bulk, ammo, and reel variants.
1N4621UR/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 3.6 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 1700 Ohms
- Current - Reverse Leakage @ Vr:
- 3.5 µA @ 2 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-213AA
1N4621UR/TR FAQ
1.How can I place an order for 1N4621UR/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4621UR/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 1N4621UR/TR reliable?
The price and inventory of 1N4621UR/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4621UR/TR is usually 5 days.
3.What payment methods are accepted for 1N4621UR/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4621UR/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4621UR/TR?
1N4621UR/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4621UR/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 1N4621UR/TR?
For technical support, including 1N4621UR/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4621UR/TR requirements.
6.How does Aetrix verify that 1N4621UR/TR is sourced from the original manufacturer or authorized distributors?
All 1N4621UR/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 1N4621UR/TR meets industry standards.
7.What is the process for return or replacement of 1N4621UR/TR?
All 1N4621UR/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4621UR/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 1N4621UR/TR part is unused and in its original packaging.
Return procedure for 1N4621UR/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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