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Microchip Technology 1N5935BUR-1/TR
- Part No.:
- 1N5935BUR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
1N5935BUR-1/TR.pdf
- Description:
- DIODE ZENER 27V 1.25W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,276
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Product details
Overview
1N5935BUR-1/TR from Microsemi is a 1.5 W surface-mount Zener diode in DO-213AB (MELF) glass package, rated for 27 V ±5% Zener voltage at 13.9 mA test current, with 23 Ω dynamic impedance, 0.25 mA knee current, and 1.0 µA reverse leakage at 20.6 V. It delivers stable voltage regulation in high-density power supply and reference circuits across industrial temperature range.
For engineers reviewing the 1N5935BUR-1/TR datasheet, 1N5935BUR-1/TR pinout, 1N5935BUR-1/TR application, or 1N5935BUR-1/TR equivalent, key selection criteria include Zener tolerance (±5%), hermetic glass construction, MIL-PRF-19500 screening availability, low thermal resistance (40 °C/W junction-to-end cap), and RoHS-compliant matte tin plating.
Technical Context
This device operates as a precision shunt regulator, maintaining stable output voltage by conducting reverse current above its specified Zener breakdown threshold. Its metallurgically bonded internal structure ensures low thermal resistance and enhanced reliability under thermal cycling and high-reliability stress conditions.
The DO-213AB MELF package provides hermetic sealing, ESD immunity per MIL-STD-750 Method 1020, and inherently radiation-hard characteristics documented in Microsemi MicroNote 050. Capacitance is specified per Figure 2 and varies with Zener voltage - for 1N5935BUR-1/TR, typical capacitance is ~35 pF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 27 V ±5% at IZT = 13.9 mA - defines nominal regulation point with tight tolerance for stable reference generation. |
| Power Dissipation | 1.5 W @ TEC ≤ 115 °C - supports continuous operation in compact layouts with adequate end-cap heatsinking. |
| Dynamic Impedance (ZZT) | 23 Ω at IZT = 13.9 mA - determines regulation stiffness; lower value improves load/line transient response. |
| Knee Current (IZK) | 0.25 mA - minimum current needed to enter useful regulation region near breakdown threshold. |
| Reverse Leakage (IR) | 1.0 µA at VR = 20.6 V - ensures minimal quiescent power loss in standby or low-current bias networks. |
| Junction Temp Range | –65 °C to +175 °C - enables deployment in extended-temperature industrial, aerospace, and downhole applications. |
Pinout & Package
DO-213AB (MELF) glass package: hermetically sealed, voidless hard glass body with tungsten slugs; cathode indicated by single band; RoHS-compliant matte tin plating over copper; weight ≈ 0.05 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side of regulated circuit; used for forward-bias protection or sensing. |
| Cathode | Zener regulation terminal / voltage reference output | Banded end; connected to higher-potential side; sinks current to maintain stable 27 V across load. |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgically bonded internal contacts | Reduces thermal resistance to 40 °C/W (junction-to-end cap), improving power handling and long-term stability under thermal stress. |
| Hermetically sealed glass construction | Eliminates moisture ingress and intermetallic degradation, enabling use in high-humidity or corrosive environments without conformal coating. |
| MIL-PRF-19500 screening option | Supports high-reliability qualification for defense, space, and critical infrastructure where lot traceability and burn-in are mandated. |
| ESD immunity (MIL-STD-750 Method 1020) | Withstands >8 kV HBM without parameter shift - simplifies handling and eliminates need for external ESD protection in assembly. |
Applications
| Industrial Power Supply Regulation | High-Reliability Reference Voltage Source |
|---|---|
Use Scenario: Stabilizing feedback node in isolated DC-DC converter secondary-side error amplifiers. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 27 V bias for optocoupler-driven regulation loop. Use Value: Maintains ±0.5% output accuracy over –40 °C to +125 °C ambient due to low tempco and hermetic stability. |
Use Scenario: Generating fixed reference for analog-to-digital converter (ADC) input scaling in test equipment. IC Role / Device Role / Timing Role: Precision Zener element establishing known 27 V rail for ratiometric measurement calibration. Use Value: Delivers <10 ppm/°C voltage drift and <0.1% long-term drift, meeting Class A instrumentation requirements. |
| Aerospace Avionics Biasing | Downhole Oil & Gas Sensor Conditioning |
Use Scenario: Providing regulated bias to radiation-tolerant op-amps in flight control interface modules. IC Role / Device Role / Timing Role: Radiation-hardened shunt regulator ensuring stable operation in total ionizing dose (TID) >100 krad(Si) environments. Use Value: Inherent radiation hardness per Microsemi MicroNote 050 eliminates need for shielding or derating in LEO missions. |
Use Scenario: Supplying excitation voltage to piezoresistive pressure transducers in borehole telemetry systems. IC Role / Device Role / Timing Role: High-temperature-stable Zener maintaining 27 V reference despite 175 °C junction exposure. Use Value: Operates continuously at +175 °C junction temperature with no parameter degradation, validated per MIL-PRF-19500 screening. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5935B | Axial-leaded DO-41 package; same 27 V ±5%, 1.5 W rating, but higher RθJA (150 °C/W vs 120 °C/W). | Lacks surface-mount compatibility and hermetic seal; unsuitable for high-density or humid-environment PCBs. | Select when through-hole assembly, lower cost, or legacy board compatibility is prioritized over density and reliability. |
| SMBG5935B | Surface-mount SMB package; same electrical specs but larger footprint (4.5 × 3.9 mm vs MELF Ø2.6 × L5.2 mm); RθJA = 100 °C/W on FR4. | Higher parasitic inductance than MELF; less optimal for high-frequency noise-sensitive references. | Choose when automated pick-and-place compatibility with standard tabbed SMT feeders outweighs RF performance and thermal efficiency. |
Compared with 1N5935B and SMBG5935B, the 1N5935BUR-1/TR offers superior thermal performance (RθJEC = 40 °C/W), hermetic reliability, and minimal parasitics - making it optimal for high-density, high-reliability, and high-frequency-stable regulation where MELF placement is feasible.
Availability
1N5935BUR-1/TR is available at Aetrix Electronics and suitable for industrial power supplies, aerospace avionics, and downhole sensor conditioning requiring stable component supply with full traceability and long-lifecycle support.
Supply support for 1N5935BUR-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, radiation-hardened, and high-performance analog and mixed-signal components.
The 1N5935BUR-1/TR belongs to Microsemi's legacy 1N59xxBUR-1 series of metallurgically bonded MELF Zeners, engineered specifically for mission-critical applications demanding hermeticity, MIL-PRF-19500 compliance, and extended temperature operation.
FAQ
What is the Zener voltage tolerance for 1N5935BUR-1/TR?
The 1N5935BUR-1/TR has a Zener voltage tolerance of ±5%, specified as 27 V at 13.9 mA test current (IZT). This tolerance is confirmed in the Electrical Characteristics table on Page 3 of Microsemi's T4-LDS-0300-1 datasheet and applies under end-cap temperature control at 30 °C.
Is 1N5935BUR-1/TR RoHS compliant?
Yes, the "e3" suffix in the full part number 1N5935BUR-1/TR indicates RoHS compliance per Microsemi's nomenclature guide. The device uses matte tin plating over copper terminals and meets JEDEC J-STD-609A Class 3 requirements, verified in the Mechanical and Packaging section of the datasheet.
What is the maximum steady-state power dissipation for 1N5935BUR-1/TR?
The 1N5935BUR-1/TR has a rated steady-state power dissipation of 1.5 W when end-cap temperature (TEC) is maintained at ≤115 °C. At 25 °C ambient on FR4 board, the derated value is 1.25 W - both values are explicitly listed in the Maximum Ratings table on Page 1 of the datasheet.
Does 1N5935BUR-1/TR support MIL-PRF-19500 screening?
Yes, MIL-PRF-19500 screening is available for 1N5935BUR-1/TR per the Features section on Page 1. Screening requires specific ordering codes defined in the Part Nomenclature table and must be requested at time of order - it is not included in standard commercial-grade shipments.
What is the cathode marking convention for 1N5935BUR-1/TR?
The 1N5935BUR-1/TR uses a single cathode band on the glass body to indicate polarity, consistent with JEDEC DO-213AB standards. The banded end is the cathode and must be connected to the higher-potential node during Zener operation - this is explicitly stated in the Mechanical and Packaging section on Page 2.
1N5935BUR-1/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AB, MELF (Glass)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 27 V
- Tolerance:
- ±5%
- Power - Max:
- 1.25 W
- Impedance (Max) (Zzt):
- 23 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 20.6 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-213AB (MELF, LL41)
1N5935BUR-1/TR FAQ
1.How can I place an order for 1N5935BUR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5935BUR-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 1N5935BUR-1/TR reliable?
The price and inventory of 1N5935BUR-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 1N5935BUR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N5935BUR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5935BUR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5935BUR-1/TR?
1N5935BUR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5935BUR-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 1N5935BUR-1/TR?
For technical support, including 1N5935BUR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5935BUR-1/TR requirements.
6.How does Aetrix verify that 1N5935BUR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N5935BUR-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 1N5935BUR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N5935BUR-1/TR?
All 1N5935BUR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5935BUR-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 1N5935BUR-1/TR part is unused and in its original packaging.
Return procedure for 1N5935BUR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5935BUR-1/TR Tags
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