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Microchip Technology 1N5221BUR-1/TR
- Part No.:
- 1N5221BUR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N5221BUR-1/TR.pdf
- Description:
- DIODE ZENER 2.4V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,745
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Product details
Overview
1N5221BUR-1/TR from Microsemi is a surface-mount 2.4 V, 5% tolerance Zener diode in DO-213AA (SOD80) MELF package, rated for 500 mW steady-state power dissipation, 20 mA test current, and operating across –65 °C to +175 °C junction temperature. It delivers precise voltage regulation in low-power analog reference and overvoltage protection circuits.
For engineers reviewing the 1N5221BUR-1/TR datasheet, 1N5221BUR-1/TR pinout, 1N5221BUR-1/TR application, or 1N5221BUR-1/TR equivalent, key selection criteria include Zener voltage tolerance (±5%), dynamic impedance (30 Ω @ 20 mA), reverse leakage (100 µA @ 0.95 V), temperature coefficient (–0.085 %/°C), and RoHS-compliant metallurgically bonded glass construction.
Technical Context
This device operates as a two-terminal voltage reference in reverse-biased breakdown mode, with regulation defined at IZT = 20 mA and characterized for thermal stability up to +175 °C junction temperature. Its hermetically sealed DO-213AA package ensures long-term reliability under thermal cycling and humidity exposure.
The 1N5221BUR-1/TR exhibits a negative temperature coefficient of –0.085 %/°C, indicating decreasing Zener voltage with rising temperature - a critical factor in precision biasing networks where drift compensation is required. Its minimal capacitance (typical <2 pF, per Figure 3) supports high-frequency noise filtering without signal loading.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 2.4 V ±5% @ 20 mA - defines stable regulation point for low-voltage reference design |
| Power Dissipation PD | 0.5 W - limits continuous current to ~208 mA at 2.4 V; derates above 50 °C ambient |
| Zener Impedance ZZT | 30 Ω @ 20 mA - determines output voltage variation under load transients |
| Reverse Leakage IR | 100 µA @ 0.95 V - sets minimum bias current threshold before regulation onset |
| Temp. Coefficient αVZ | –0.085 %/°C - quantifies voltage drift per degree; enables thermal error budgeting |
| Junction Temp. Range | –65 °C to +175 °C - supports operation in automotive engine bays and industrial controls |
| Forward Voltage VF | 1.1 V max @ 200 mA - confirms standard silicon diode conduction behavior in forward bias |
Pinout & Package
DO-213AA (SOD80 / MLL34) metallurgically bonded glass MELF package: cylindrical body with tin-lead or RoHS-compliant matte-tin end-cap terminations; cathode identified by single band; polarity requires banded end to be positive during Zener operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Regulated output node | Connected to higher potential; supplies stable 2.4 V reference when reverse-biased |
| Anode (unbanded end) | Reference return path | Connected to circuit ground or lower-potential rail; completes Zener conduction loop |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgical bonding | Eliminates wire bonds and interfacial delamination risk - improves thermal cycling endurance |
| Hermetic glass sealing | Prevents moisture ingress and parameter shift over time - critical for aerospace and medical applications |
| MIL-PRF-19500 up-screening option | Enables qualification to military reliability standards (JAN/JANTX levels) without redesign |
| Low capacitance (<2 pF typical) | Minimizes high-frequency coupling in RF bias networks and fast-switching protection circuits |
| Radiation hardness | Inherently tolerant to total ionizing dose (TID) per MicroNote 050 - suitable for space-qualified systems |
Applications
| Low-Voltage Reference Supply | Overvoltage Clamp for MCU I/O |
|---|---|
Use Scenario: Providing stable 2.4 V bias to op-amp input stages or ADC reference inputs in battery-powered sensors. IC Role / Device Role / Timing Role: Two-terminal shunt voltage reference establishing fixed DC potential independent of supply variation. Use Value: Enables sub-1% measurement accuracy despite ±10% battery discharge range and –40 °C to +85 °C operating envelope. | Use Scenario: Protecting 3.3 V microcontroller GPIO pins from ESD and transient surges on industrial control lines. IC Role / Device Role / Timing Role: Passive clamping element diverting excess energy to ground before IC damage threshold is exceeded. Use Value: Limits pin voltage to ≤2.4 V + VF (~3.5 V peak), staying safely below 3.6 V absolute maximum rating. |
| Temperature-Compensated Bias Network | Low-Power LED Current Regulation |
Use Scenario: Stabilizing base-emitter voltage of a PNP transistor in a thermally compensated current source. IC Role / Device Role / Timing Role: Zener element paired with NTC thermistor to counteract semiconductor VBE drift. Use Value: Achieves <±50 ppm/°C current stability over –25 °C to +75 °C using known αVZ = –0.085 %/°C. | Use Scenario: Setting constant current for indicator LEDs in HVAC control panels with wide ambient temperature swings. IC Role / Device Role / Timing Role: Shunt regulator defining voltage drop across series current-setting resistor. Use Value: Maintains LED brightness within ±8% over 0 °C to +60 °C due to tight 5% VZ tolerance and low thermal resistance (RθJEC = 100 °C/W). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5221B-1 | Same 2.4 V ±5% spec, but in axial DO-35 (DO-204AH) package - no surface-mount capability | Requires through-hole PCB layout; unsuitable for automated SMT assembly | Select only for legacy repair or prototyping where board real estate and assembly method permit axial leads |
| BZX55C2V4 | 2.4 V ±5%, 500 mW, DO-35 package; higher ZZT (60 Ω vs. 30 Ω); no MIL-PRF-19500 screening path | Lacks radiation hardness and hermetic sealing - limited to commercial-grade consumer electronics | Choose for cost-sensitive, non-critical applications where enhanced reliability and environmental robustness are not required |
Compared with 1N5221B-1 and BZX55C2V4, the 1N5221BUR-1/TR uniquely combines SMT compatibility, hermetic glass packaging, MIL-qualified screening options, and radiation tolerance - making it the only choice for high-reliability embedded systems requiring long-term parametric stability.
Availability
1N5221BUR-1/TR is available at Aetrix Electronics and suitable for low-power voltage reference, overvoltage protection, and precision biasing applications requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 1N5221BUR-1/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, mixed-signal, and RF solutions for aerospace, defense, and industrial markets.
The 1N5221BUR-1/TR belongs to Microsemi's legacy Zener regulator family designed specifically for mission-critical applications demanding hermetic sealing, radiation tolerance, and extended temperature operation - not general-purpose commercial use.
FAQ
What is the Zener voltage tolerance of the 1N5221BUR-1/TR?
The 1N5221BUR-1/TR has a nominal Zener voltage of 2.4 V with a guaranteed tolerance of ±5% at 20 mA test current, as confirmed in the Electrical Characteristics table on page 3 of Microsemi's T4-LDS-0232-1 datasheet. This tolerance applies to the "B" suffix variant and is verified under stabilized thermal conditions at 25 °C.
Does the 1N5221BUR-1/TR support RoHS compliance?
Yes, the 1N5221BUR-1/TR is offered in RoHS-compliant versions (denoted by "e3" in the part nomenclature), with annealed matte-tin plating on end caps. RoHS compliance is available for commercial-grade units only, per the "PART NOMENCLATURE" section on page 2 of the datasheet.
What is the maximum power dissipation for the 1N5221BUR-1/TR?
The 1N5221BUR-1/TR has a steady-state power dissipation rating of 0.5 W at end cap temperature <125 °C or ambient temperature <50 °C on FR4 board. Derating begins above 50 °C ambient, following the curve in Figure 2 of the datasheet, with RθJA = 250 °C/W under specified mounting conditions.
Is the 1N5221BUR-1/TR suitable for high-reliability aerospace applications?
Yes - the 1N5221BUR-1/TR supports up-screening per MIL-PRF-19500, and its hermetically sealed DO-213AA package, metallurgical bonding, and inherent radiation hardness (per MicroNote 050) make it qualified for aerospace and defense applications when procured with appropriate reliability level suffixes (e.g., MQ, MX).
What is the temperature coefficient of the 1N5221BUR-1/TR?
The 1N5221BUR-1/TR has a Zener voltage temperature coefficient of –0.085 %/°C, measured between 25 °C and 125 °C at 20 mA test current. This negative coefficient is consistent across the 1N5221–1N5242 subgroup and enables predictable drift modeling in precision analog designs.
1N5221BUR-1/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):
- 2.4 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 30 Ohms
- Current - Reverse Leakage @ Vr:
- 100 µA @ 1 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
1N5221BUR-1/TR FAQ
1.How can I place an order for 1N5221BUR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5221BUR-1/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 1N5221BUR-1/TR reliable?
The price and inventory of 1N5221BUR-1/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5221BUR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N5221BUR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5221BUR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5221BUR-1/TR?
1N5221BUR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5221BUR-1/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 1N5221BUR-1/TR?
For technical support, including 1N5221BUR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5221BUR-1/TR requirements.
6.How does Aetrix verify that 1N5221BUR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N5221BUR-1/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 1N5221BUR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N5221BUR-1/TR?
All 1N5221BUR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5221BUR-1/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 1N5221BUR-1/TR part is unused and in its original packaging.
Return procedure for 1N5221BUR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5221BUR-1/TR Tags
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