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Microchip Technology 1N5237BUR-1
- Part No.:
- 1N5237BUR-1
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N5237BUR-1.pdf
- Description:
- DIODE ZENER 8.2V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,252
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Product details
Overview
1N5237BUR-1 from Microsemi is a surface-mount 8.2 V, 5% tolerance Zener diode in a DO-213AA (SOD80/MLL34) MELF glass package, rated for 500 mW steady-state power dissipation, with 8.0 Ω dynamic impedance at 20 mA test current and ±0.062 %/°C temperature coefficient. It serves as a precision voltage reference or shunt regulator in low-power analog circuits, power supply feedback paths, and overvoltage protection.
For engineers reviewing the 1N5237BUR-1 datasheet, 1N5237BUR-1 pinout, 1N5237BUR-1 application, or 1N5237BUR-1 equivalent, key selection criteria include Zener voltage accuracy, thermal stability across -65°C to +175°C junction range, low leakage (<3.0 µA at 6.2 V), hermetic glass packaging for reliability, and compatibility with reflow soldering up to 260°C.
Technical Context
This device operates as a reverse-biased silicon Zener diode, maintaining stable regulation near its 8.2 V breakdown voltage under controlled current conditions (IZT = 20 mA). Its metallurgically bonded construction ensures low thermal resistance (RθJEC = 100 °C/W) and robust performance in high-reliability environments.
The 1N5237BUR-1 exhibits a positive temperature coefficient (+0.062 %/°C), indicating increasing Zener voltage with rising temperature - a critical factor when designing temperature-compensated references or cascaded Zener networks. Its minimal capacitance (typical <2 pF) supports high-frequency noise suppression without signal distortion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 8.2 V at 20 mA - defines precise regulation point for feedback or clamping circuits |
| Power Dissipation PD | 0.5 W - limits maximum continuous Zener current to ~61 mA at 8.2 V |
| Zener Impedance ZZT | 8.0 Ω at IZT = 20 mA - determines output voltage variation under load transients |
| Temp Coefficient αVZ | +0.062 %/°C - quantifies drift magnitude per degree Celsius in temperature-sensitive designs |
| Reverse Leakage IR | ≤3.0 µA at 6.2 V - ensures minimal quiescent current in standby or battery-powered systems |
| Junction Temp Range | -65°C to +175°C - enables operation in aerospace, industrial, and downhole applications |
| Forward Voltage VF | ≤1.1 V at 200 mA - confirms standard silicon diode conduction behavior in forward bias |
Pinout & Package
DO-213AA (SOD80/MLL34) MELF glass package: hermetically sealed, metallurgically bonded, cathode band marked on one end cap; terminals are symmetric end caps with tin-lead or RoHS-compliant matte-tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Regulated output node | Connected to higher potential during Zener operation; defines polarity for voltage reference placement |
| Anode (unbanded end) | Reference ground/reference return | Typically tied to system ground or feedback node; completes current path through series resistor |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Eliminates moisture ingress and long-term parameter drift in humid or corrosive environments |
| Metallurgical bonding | Reduces thermal resistance (RθJEC = 100 °C/W) for improved power handling and thermal cycling endurance |
| RoHS-compliant option (e3 suffix) | Enables compliance with environmental directives while retaining identical electrical performance |
| MIL-PRF-19500 up-screening available | Supports high-reliability qualification for defense and space programs with traceable screening records |
| Low capacitance (<2 pF typical) | Minimizes high-frequency coupling and preserves signal integrity in RF-adjacent or fast-switching circuits |
Applications
| Voltage Reference for Op-Amp Circuits | Overvoltage Clamp in Sensor Interfaces |
|---|---|
Use Scenario: Providing stable 8.2 V bias to instrumentation amplifier input stages in precision measurement systems. IC Role / Device Role / Timing Role: Shunt voltage reference establishing fixed common-mode level for differential signal conditioning. Use Value: Enables sub-0.1% gain stability over temperature due to matched +0.062 %/°C drift and low dynamic impedance. | Use Scenario: Protecting 3.3 V or 5 V ADC inputs from transient surges exceeding rail voltage in industrial sensor nodes. IC Role / Device Role / Timing Role: Fast-acting shunt clamp diverting excess energy before damage occurs to downstream logic. Use Value: Limits peak voltage to ≤8.2 V with <3 µA leakage at 6.2 V, preserving signal fidelity during normal operation. |
| Feedback Element in Isolated DC-DC Converters | Temperature-Stable Bias Generator |
Use Scenario: Setting output voltage in optocoupler-based feedback loops of flyback converters delivering 12 V or 15 V outputs. IC Role / Device Role / Timing Role: Precision Zener defining secondary-side regulation threshold, referenced to TL431 or similar error amplifier. Use Value: Maintains ±1% output accuracy across -40°C to +85°C ambient via predictable +0.062 %/°C coefficient and 5% initial tolerance. | Use Scenario: Generating a compensated bias voltage for temperature-sensitive oscillator circuits or analog comparators. IC Role / Device Role / Timing Role: Stable reference node enabling predictable thermal drift compensation using complementary components. Use Value: Delivers repeatable 8.2 V setpoint with known drift slope, simplifying two-point calibration in field-deployed equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5237B-1 | Same 8.2 V, 5% tolerance, but in axial DO-35 (DO-204AH) package; no MELF form factor | Lacks surface-mount compatibility and hermetic sealing; suitable only for through-hole prototyping or legacy repair | Select 1N5237B-1 only if board layout requires axial leads or manual assembly without reflow capability |
| BZX55C8V2 | 8.2 V, 5% tolerance, DO-35 package; higher ZZT (15 Ω vs. 8.0 Ω); non-hermetic epoxy construction | Lower reliability in high-humidity or radiation-prone environments; not MIL-qualified | Choose BZX55C8V2 for cost-sensitive commercial applications where hermeticity and screening are unnecessary |
Compared with 1N5237B-1 and BZX55C8V2, the 1N5237BUR-1 delivers superior thermal performance (RθJEC = 100 °C/W), hermetic reliability, and tighter regulation stability - making it preferred for aerospace, medical, and industrial control systems requiring long-term parametric consistency.
Availability
1N5237BUR-1 is available at Aetrix Electronics and suitable for precision voltage reference, overvoltage protection, and isolated power supply feedback applications requiring stable component supply, long-term parametric consistency, and high-reliability packaging.
Supply support for 1N5237BUR-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 RF solutions for aerospace, defense, and industrial markets.
The 1N5237BUR-1 belongs to Microsemi's legacy 1N52xxBUR-1 Zener family, engineered for surface-mount voltage regulation in mission-critical systems where hermetic sealing, radiation hardness, and MIL-qualified screening are essential design requirements.
FAQ
What is the Zener voltage tolerance for 1N5237BUR-1?
The 1N5237BUR-1 has a nominal Zener voltage of 8.2 V with a guaranteed tolerance of ±5%, as indicated by the "B" suffix in the part number per Microsemi's nomenclature. This tolerance applies at 25°C with 20 mA test current and is maintained across the full operating temperature range of -65°C to +175°C junction temperature.
Does 1N5237BUR-1 support lead-free reflow soldering?
Yes, the 1N5237BUR-1 supports lead-free reflow soldering with a maximum solder temperature of 260°C for 10 seconds, as specified in the Absolute Maximum Ratings table. RoHS-compliant versions (marked with "e3") use annealed matte-tin plating and meet J-STD-020 moisture sensitivity level 1 requirements.
What is the maximum reverse leakage current for 1N5237BUR-1?
The maximum reverse leakage current for 1N5237BUR-1 is 3.0 µA at VR = 6.2 V and TA = 25°C. This low leakage ensures minimal power loss in battery-operated or high-impedance reference circuits where quiescent current must be tightly controlled.
Can 1N5237BUR-1 be used in high-reliability aerospace applications?
Yes, the 1N5237BUR-1 is eligible for up-screening per MIL-PRF-19500, supporting JAN, JANTX, JANTXV, and JANS levels. Its hermetic DO-213AA package, metallurgical bonding, and inherent radiation hardness (per MicroNote 050) make it suitable for aerospace and defense applications requiring extended lifetime and parametric stability.
How does the temperature coefficient of 1N5237BUR-1 affect circuit design?
The 1N5237BUR-1 has a positive temperature coefficient of +0.062 %/°C, meaning its Zener voltage increases by approximately 5.1 mV/°C. Designers must account for this drift when using multiple Zeners in series or when referencing temperature-sensitive analog blocks - often mitigated via complementary drift components or calibration.
1N5237BUR-1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AA
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 8.2 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 8 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 6.5 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
1N5237BUR-1 FAQ
1.How can I place an order for 1N5237BUR-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5237BUR-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 1N5237BUR-1 reliable?
The price and inventory of 1N5237BUR-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5237BUR-1 is usually 5 days.
3.What payment methods are accepted for 1N5237BUR-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5237BUR-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5237BUR-1?
1N5237BUR-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5237BUR-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 1N5237BUR-1?
For technical support, including 1N5237BUR-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5237BUR-1 requirements.
6.How does Aetrix verify that 1N5237BUR-1 is sourced from the original manufacturer or authorized distributors?
All 1N5237BUR-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 1N5237BUR-1 meets industry standards.
7.What is the process for return or replacement of 1N5237BUR-1?
All 1N5237BUR-1 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5237BUR-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 1N5237BUR-1 part is unused and in its original packaging.
Return procedure for 1N5237BUR-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5237BUR-1 Tags
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MMBZ5240B-7-F
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BZT52C5V6T-7
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MMSZ5231B-7-F
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BZX84C3V3LT1G
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MM5Z5V1ST1G
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SMAJ4744A-TP
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