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Microchip Technology 1N5238BUR-1
- Part No.:
- 1N5238BUR-1
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N5238BUR-1.pdf
- Description:
- DIODE ZENER 8.7V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,039
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Product details
Overview
1N5238BUR-1 from Microsemi is a 500 mW surface-mount Zener diode with nominal Zener voltage 8.7 V at 20 mA test current, ±5% tolerance (B suffix), 8 Ω dynamic impedance at IZT, and DO-213AA (SOD80/MLL34) MELF glass package. It regulates voltage in low-power biasing, reference, and protection circuits across industrial and aerospace systems.
For engineers reviewing the 1N5238BUR-1 datasheet, 1N5238BUR-1 pinout, 1N5238BUR-1 application, or 1N5238BUR-1 equivalent, key selection criteria include Zener voltage stability over temperature (αVZ = +0.065 %/°C), low leakage (<3.0 µA @ 6.2 V), hermetic metallurgical bond reliability, and MIL-PRF-19500 upscreening eligibility.
Technical Context
This device operates as a reverse-biased voltage reference with breakdown knee current IZK = 0.25 mA and maximum Zener current IZM = 65 mA. Its thermal resistance junction-to-end cap is 100 °C/W, enabling stable regulation up to +175 °C junction temperature when end cap temperature remains below 125 °C.
The DO-213AA package uses metallurgically bonded glass construction with tin-lead or RoHS-compliant matte-tin end-cap plating, cathode band marking, and minimal capacitance (typical <2 pF at 1 MHz). It meets MIL-STD-750 Method 1020 for ESD insensitivity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 8.7 V at 20 mA - precise DC reference for analog sensing and power supply feedback loops |
| Power Dissipation PD | 0.5 W - supports continuous regulation in compact SMT layouts without forced cooling |
| Zener Impedance ZZT | 8 Ω at 20 mA - ensures low output impedance for stable voltage under varying load conditions |
| Reverse Leakage IR | <3.0 µA @ 6.2 V - minimizes quiescent current in battery-powered reference circuits |
| Temp. Coefficient αVZ | +0.065 %/°C - enables predictable drift compensation in wide-temperature-range instrumentation |
| Forward Voltage VF | 1.1 V max @ 200 mA - allows use as clamping diode in bidirectional protection schemes |
| Junction Temp. Range | –65 to +175 °C - qualified for harsh-environment aerospace and downhole electronics |
Pinout & Package
DO-213AA (SOD80/MLL34) MELF glass package: hermetically sealed, metallurgically bonded, cathode indicated by single band on glass body; terminals are solderable end caps with tin-lead or RoHS matte-tin plating per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Forward conduction terminal | Connects to lower-potential node during forward bias; used for clamping or polarity protection |
| Cathode (banded end) | Zener regulation terminal | Connects to higher-potential node during reverse bias; provides stable 8.7 V reference when current ≥20 mA |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Prevents moisture ingress and long-term parameter drift in humid or high-reliability environments |
| Metallurgical bond interface | Eliminates interfacial delamination risk under thermal cycling, improving lifetime reliability vs. epoxy-packaged Zeners |
| MIL-PRF-19500 upscreening option | Enables qualification for military/aerospace applications requiring enhanced screening and traceability |
| Low capacitance (<2 pF typical) | Minimizes signal distortion in RF detector and high-frequency reference applications |
| ESD insensitivity (MIL-STD-750 Method 1020) | Withstands handling and assembly without special precautions, reducing manufacturing yield loss |
Applications
| Power Supply Reference | Sensor Biasing Circuit |
|---|---|
Use Scenario: Provides stable 8.7 V reference for TL431-based adjustable linear regulators in telecom power modules. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to set precise feedback threshold voltage. Use Value: Maintains ±1% output regulation over –40 to +85 °C ambient due to predictable +0.065 %/°C drift and low dynamic impedance. | Use Scenario: Supplies bias voltage to bridge-type pressure transducers in industrial process control sensors. IC Role / Device Role / Timing Role: Low-noise, low-leakage voltage reference establishing excitation potential for Wheatstone bridge arms. Use Value: Enables sub-0.1% full-scale error by limiting bias current drift and minimizing leakage-induced offset. |
| Overvoltage Clamp | Aerospace Signal Conditioning |
Use Scenario: Protects ADC input pins from transient surges in automotive engine control units. IC Role / Device Role / Timing Role: Reverse-biased shunt clamp limiting voltage to 8.7 V during ESD or load-dump events. Use Value: Responds within nanoseconds with <3.0 µA leakage at 6.2 V, preserving signal integrity during normal operation. | Use Scenario: Generates precision reference for radiation-hardened data acquisition in satellite telemetry subsystems. IC Role / Device Role / Timing Role: Hermetically sealed Zener providing stable 8.7 V reference in total ionizing dose (TID) environments. Use Value: Inherent radiation hardness per MicroNote 050 ensures no parametric shift after 100 krad(Si) exposure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5238B-1 | Same electrical specs but DO-35 axial-leaded package; RθJA = 500 °C/W vs. 250 °C/W for DO-213AA | Requires through-hole PCB layout; unsuitable for high-density SMT assemblies | Select 1N5238B-1 only when legacy axial footprint or manual prototyping is required |
| BZX55C8V2 | 8.2 V nominal Zener (not 8.7 V); ±5% tolerance; DO-35 package; 500 mW rating; higher ZZT = 15 Ω | Not a direct voltage match; requires circuit recalibration for 8.7 V reference use cases | Choose BZX55C8V2 only if 8.2 V suffices and DO-35 mechanical fit is mandatory |
Compared with 1N5238B-1 and BZX55C8V2, the 1N5238BUR-1 delivers superior thermal performance in SMT layouts, exact 8.7 V regulation, and hermetic reliability-making it optimal for space-constrained, high-stability, or radiation-exposed designs where DO-213AA mounting is feasible.
Availability
1N5238BUR-1 is available at Aetrix Electronics and suitable for industrial power supplies, sensor signal conditioning, overvoltage protection circuits, and aerospace telemetry systems requiring stable component supply and long-term obsolescence management.
Supply support for 1N5238BUR-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, radiation-hardened, and aerospace-grade components.
The 1N52xxBUR-1 series was designed for mission-critical voltage regulation in defense, space, and industrial systems where hermetic sealing, MIL-spec screening, and stable Zener characteristics over extreme temperature ranges are essential.
FAQ
What is the Zener voltage tolerance for 1N5238BUR-1?
The 1N5238BUR-1 has a nominal Zener voltage of 8.7 V with ±5% tolerance, indicated by the "B" suffix in the part number per Microsemi's nomenclature. This means the actual VZ falls between 8.27 V and 9.14 V at 20 mA test current and 25 °C ambient temperature, verified per the Electrical Characteristics table on page 3 of T4-LDS-0232-1 Rev. 1.
Is 1N5238BUR-1 RoHS compliant?
Yes, the 1N5238BUR-1 is available in RoHS-compliant versions marked with the "e3" suffix (e.g., 1N5238BUR-1e3), featuring annealed matte-tin end-cap plating. RoHS compliance applies only to commercial-grade units; MIL-spec variants retain tin-lead plating per specification requirements.
What is the maximum steady-state power dissipation for 1N5238BUR-1?
The 1N5238BUR-1 has a maximum steady-state power dissipation of 0.5 W, specified at end cap temperature TEC < 125 °C or ambient temperature TA < 50 °C when mounted on an FR4 board with 1 oz copper and the recommended footprint. Derating is required above these temperatures per Figure 2 in the datasheet.
Does 1N5238BUR-1 support MIL-PRF-19500 screening?
Yes, 1N5238BUR-1 supports up-screening per MIL-PRF-19500, with reliability levels designated by prefix codes (e.g., MQ, MX, MV, MSP) per the Part Nomenclature section. Screening options include extended temperature testing, burn-in, and lot traceability-available upon factory consultation and order specification.
What is the cathode marking convention for 1N5238BUR-1?
The 1N5238BUR-1 uses a single cathode band on the glass body to indicate polarity: the banded end is the cathode and must be connected to the higher-potential node during Zener regulation. This marking aligns with JEDEC DO-213AA standards and is visible under standard optical inspection.
1N5238BUR-1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AA
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 8.7 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
1N5238BUR-1 FAQ
1.How can I place an order for 1N5238BUR-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5238BUR-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 1N5238BUR-1 reliable?
The price and inventory of 1N5238BUR-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5238BUR-1 is usually 5 days.
3.What payment methods are accepted for 1N5238BUR-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5238BUR-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5238BUR-1?
1N5238BUR-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5238BUR-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 1N5238BUR-1?
For technical support, including 1N5238BUR-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5238BUR-1 requirements.
6.How does Aetrix verify that 1N5238BUR-1 is sourced from the original manufacturer or authorized distributors?
All 1N5238BUR-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 1N5238BUR-1 meets industry standards.
7.What is the process for return or replacement of 1N5238BUR-1?
All 1N5238BUR-1 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5238BUR-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 1N5238BUR-1 part is unused and in its original packaging.
Return procedure for 1N5238BUR-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5238BUR-1 Tags
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