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Microchip Technology 1N5235BUR-1
- Part No.:
- 1N5235BUR-1
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N5235BUR-1.pdf
- Description:
- DIODE ZENER 6.8V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,384
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Product details
Overview
1N5235BUR-1 from Microsemi is a surface-mount 6.8 V, ±5% tolerance Zener diode in DO-213AA (SOD-80/MELF) package, rated for 500 mW steady-state power dissipation, with 5.0 Ω dynamic impedance at 20 mA test current and 3.0 µA max reverse leakage at 4.8 V. 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 1N5235BUR-1 datasheet, 1N5235BUR-1 pinout, 1N5235BUR-1 application, or 1N5235BUR-1 equivalent, key selection criteria include its 6.8 V nominal Zener voltage, 5.0 Ω Zener impedance, ±0.050 %/°C temperature coefficient, hermetically sealed glass MELF construction, and compatibility with reflow soldering up to 260 °C.
Technical Context
This device operates in reverse breakdown to maintain stable voltage across its terminals under varying load and temperature conditions. Its metallurgically bonded glass construction ensures low thermal resistance (100 °C/W junction-to-end-cap) and inherent radiation hardness per MicroNote 050.
The 1N5235BUR-1 exhibits minimal capacitance (typical <2 pF), non-sensitive ESD behavior (MIL-STD-750 Method 1020), and a defined knee region with IZK = 0.25 mA, enabling reliable regulation down to low-current operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 6.8 V at 20 mA - precise regulation point for feedback or reference circuits |
| Zener Impedance ZZT | 5.0 Ω - low dynamic resistance ensures stable output under current variation |
| Reverse Leakage IR | 3.0 µA @ 4.8 V - negligible error contribution in high-impedance bias networks |
| Power Dissipation PD | 0.5 W - supports continuous operation in compact SMT layouts with proper PCB thermal relief |
| Temp. Coefficient αVZ | +0.050 %/°C - predictable drift enables accurate compensation in temperature-critical designs |
| Forward Voltage VF | 1.1 V max @ 200 mA - defines forward conduction threshold in dual-direction protection schemes |
| Junction Temp. Range | –65 to +175 °C - suitable for extended industrial and aerospace environments |
Pinout & Package
DO-213AA (SOD-80 / MELF) hermetically sealed glass package with axial symmetry and cathode band marking. End-cap terminals are tin-lead or RoHS-compliant matte-tin plated for solderability per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Zener regulation terminal | Connected to higher potential during regulation; polarity must be observed to avoid forward conduction |
| Anode (unbanded end) | Reference/return terminal | Common return path for regulated output; forms shunt path to ground or reference node |
Key Features
| Feature | Design Value |
|---|---|
| Hermetically sealed glass MELF | Eliminates moisture ingress and long-term parameter drift in humid or harsh environments |
| Metallurgical bond construction | Enables low RθJEC (100 °C/W) for improved thermal stability and pulse power handling |
| Minimal capacitance (<2 pF) | Preserves high-frequency signal integrity in RF biasing and fast-switching protection circuits |
| ESD insensitivity (MIL-STD-750 Method 1020) | Reduces need for external ESD protection in board-level assembly and field operation |
| Radiation hardness (MicroNote 050) | Validated performance in total ionizing dose (TID) environments without derating |
Applications
| Power Supply Feedback | Low-Power Reference |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or buck-derived DC-DC converters using optocoupler feedback. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 6.8 V threshold to TL431 or optocoupler LED drive circuit. Use Value: Tight 5% tolerance and low 5.0 Ω ZZT minimize output voltage error and improve load regulation. |
Use Scenario: Generating stable bias voltages for op-amp input stages, sensor excitation, or ADC reference dividers. IC Role / Device Role / Timing Role: Precision shunt reference replacing larger TO-92 Zeners in space-constrained analog signal chains. Use Value: Sub-2 pF capacitance avoids phase shift in high-gain amplifier feedback networks. |
| Overvoltage Clamp | Temperature-Stable Bias |
Use Scenario: Protecting microcontroller I/O pins or analog inputs from transient overvoltage events. IC Role / Device Role / Timing Role: Fast-acting shunt clamp limiting voltage to 6.8 V before damage thresholds of downstream ICs. Use Value: Low 100 °C/W RθJEC allows brief energy absorption without thermal runaway during surge events. |
Use Scenario: Establishing temperature-compensated bias points in precision instrumentation amplifiers. IC Role / Device Role / Timing Role: Voltage reference with +0.050 %/°C TC used in conjunction with NTC thermistors or complementary transistors. Use Value: Predictable positive TC enables linear cancellation of negative TC components in bias networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5235B-1 | Axial DO-35 package; same electrical specs but no MELF mechanical robustness or reflow compatibility | Preferred for through-hole prototyping or legacy board upgrades where SMT is not feasible | Select 1N5235B-1 only when manual assembly or wave soldering is required |
| BZX55C6V8 | 5% tolerance, 500 mW, but plastic DO-35 package; higher capacitance (~4 pF); no radiation hardness claim | Suitable for commercial-grade consumer electronics where cost and availability outweigh reliability requirements | Choose BZX55C6V8 for cost-sensitive volume production with relaxed environmental and lifetime demands |
Compared with 1N5235B-1 and BZX55C6V8, the 1N5235BUR-1 delivers superior thermal performance, hermetic reliability, and radiation tolerance-critical for aerospace, medical, and industrial control systems where long-term parametric stability is mandatory.
Availability
1N5235BUR-1 is available at Aetrix Electronics and suitable for power supply feedback, low-power reference, overvoltage clamp, and temperature-stable bias applications requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 1N5235BUR-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 radiation-hardened components for aerospace, defense, and industrial markets.
The 1N5235BUR-1 belongs to Microsemi's legacy 1N52xxBUR-1 Zener series, designed specifically for surface-mount voltage regulation in mission-critical systems demanding hermetic sealing, MIL-PRF-19500 up-screening capability, and proven radiation hardness.
FAQ
What is the Zener voltage tolerance of the 1N5235BUR-1?
The 1N5235BUR-1 has a nominal Zener voltage of 6.8 V with a ±5% tolerance, indicated by the "B" suffix in its part number per Microsemi's nomenclature. This corresponds to a guaranteed regulation range of 6.46 V to 7.14 V at 20 mA test current and 25 °C ambient temperature.
Is the 1N5235BUR-1 compatible with lead-free reflow soldering processes?
Yes, the 1N5235BUR-1 supports lead-free reflow soldering with a maximum solder temperature of 260 °C for 10 seconds, as specified in its Absolute Maximum Ratings table. Its end-cap plating is RoHS-compliant matte-tin (e3 suffix option), ensuring reliable wetting and intermetallic formation under standard JEDEC J-STD-020 profiles.
Does the 1N5235BUR-1 have a documented radiation hardness specification?
Yes, the 1N5235BUR-1 is inherently radiation hard per Microsemi MicroNote 050, which documents its performance under total ionizing dose (TID) exposure. This characteristic is intrinsic to its metallurgically bonded glass construction and does not require additional screening or testing for qualification in low-to-medium radiation environments.
What is the maximum reverse leakage current for the 1N5235BUR-1?
The 1N5235BUR-1 specifies a maximum reverse leakage current of 3.0 µA at VR = 4.8 V and TA = 25 °C. This value remains ≤0.1 µA for VR ≥ 5.0 V across the full operating temperature range, supporting use in ultra-low-power bias networks.
Can the 1N5235BUR-1 be used in place of the through-hole 1N5235B-1?
The 1N5235BUR-1 shares identical electrical specifications with the 1N5235B-1 but uses a DO-213AA MELF package instead of DO-35. While functionally equivalent for regulation, it is not a drop-in replacement due to different footprint, thermal path, and mounting method-PCB layout and assembly process must be adapted for surface-mount implementation.
1N5235BUR-1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AA
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 6.8 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 5 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 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
1N5235BUR-1 FAQ
1.How can I place an order for 1N5235BUR-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5235BUR-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 1N5235BUR-1 reliable?
The price and inventory of 1N5235BUR-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5235BUR-1 is usually 5 days.
3.What payment methods are accepted for 1N5235BUR-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5235BUR-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5235BUR-1?
1N5235BUR-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5235BUR-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 1N5235BUR-1?
For technical support, including 1N5235BUR-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5235BUR-1 requirements.
6.How does Aetrix verify that 1N5235BUR-1 is sourced from the original manufacturer or authorized distributors?
All 1N5235BUR-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 1N5235BUR-1 meets industry standards.
7.What is the process for return or replacement of 1N5235BUR-1?
All 1N5235BUR-1 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5235BUR-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 1N5235BUR-1 part is unused and in its original packaging.
Return procedure for 1N5235BUR-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5235BUR-1 Tags
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MM5Z5V1ST1G
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